Electro-optic Modulators

Electro-optic Modulators

Keywords: Electro-optic modulator, EOM, pulse picker
Feb 12, 2021 View: 5258 Data Sheet

List of EO Modulators Drivers Phase Modulator Intensity Modulator Driver 1. Electro-optic Intensity Modulator The STK-KY-AM series electro-optic intensity modulator utilizes the electro-optical effect of lithium niobate and push-pull Mach-Zehnder inte

STK Series EO Light Modulators and Drivers

List of EO Modulators & Drivers

  • Phase Modulator

  • Intensity Modulator

  • Driver

1. Electro-optic Intensity Modulator

The STK-AM series electro-optic intensity modulator utilizes the electro-optical effect of lithium niobate and push-pull Mach-Zehnder interference structure to achieve intensity modulation of optical signals. It features low insertion loss, high modulation bandwidth, high extinction ratio, low half-wave voltage and high damage optical power. This product is mainly used for electro-optical signal conversion in high-speed optical fiber communication systems, the generation of light sidebands, high extinction ratio light pulse generation in quantum communication, microwave fiber link and other fields.

electro-optic modulator

Key Features

  • Wavelengths optional

  • Low half-wave voltage

  • High bandwidth

  • Low insertion loss

Applications

  • High-speed optical fiber communication systems

  • Microwave fiber link

  • Quantum communication

Parameters Symbol STK-AM-08 STK-AM-10 STK-AM-15-10G STK-AM-15-20G
Wavelength 830±40 1064±60 1550±100nm 155±100nm
Insertion loss IL <5 dB <4 dB <4 dB <4.5 dB
Optical return loss ORL -40 dB -45 dB -45dB -45dB
Bandwidth (-3dB) S21 2.5GHz 10GHz- 10GHz 20GHz
Rise time 10%~90% tr 150ps 35ps 35ps 18ps
Half-wave voltage
@50KHz, RF
5V 4.5V 4V 5V
Half wave voltage @Bias 6V 6V 5V 5V
Extinction ratio ER 28dB 30dB >25dB >25dB
Input resistance ZRF 50 @RF, 1M @Bias
Electrical interface SMA(f) K(f)
Electrical return loss S11 <-10dB
Input fiber PM Panda slow axis alignment
Output fiber Single mode fiber or PM fiber
Fiber connector FC/APC or customer specified
Operating temperature Top -10~60C
Storage temperature Tst -40~80C
RF input power Pi <28dBm
Max. input optical power Po 30mW 50mW 100mW 100mW

1.1 1064nm High Extinction Ratio Electro-optic Intensity Modulator STK-AM-10

electro-optic modulator

Key Features

  • 1064nm Operation

  • Low insertion loss

  • 3dB bandwidth 5GHz

  • Low half-wave voltage

  • High Extinction Ratio >50dB

Applications

  • Optical Pulse Generation

  • Optical fiber sensing system

  • Laser mode locking

The 1064nm high extinction ratio electro-optical intensity modulator integrates two Mach-Zehnder intensity modulators with a push-pull structure, which can achieve an extinction ratio of up to 50dB. It is used in the fields of high-speed optical pulse generation, fiber sensing, and laser mode locking.

Block diagram

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Parameters Symbol Min. Typ. Max. Unit
Optical Parameters
Cystal LiNbO3 X-Cut Y-Prop
Waveguide process APE
Wavelength 980 1064 1100 nm
Insertion loss* IL 7 8 dB
Optical return loss ORL -40 dB
Extinction ratio @DC ER@DC 50 dB
Polarization extinction ratio* PER 25 28 dB
Fiber Input Panda PM 980
Output Panda PM 980
Fiber connector FC/PC、FC/APC or user specified
Electrical Parameters
Bandwidth(-3dB) S21 5 GHz
Half-wave voltage Vpi RF1 & RF2 Vπ@50KHz 4.5 5 V
Bias1 & Bias2 Vπ@Bias 4 5 V
Electrical return loss S11 -12 -10 dB
Input impedance RF1 & RF2 ZRF 50
Bias1 & Bias2 ZBIAS 1M
Electrical connector RF1 & RF2 SMA(f)
Bias1 & Bias2 4pin

*with connector

Absolute Maximum Ratings

Parameters Symbol Unit Min. Typ. Max.
Input optical power Pin,Max dBm 10
RF input power dBm 28
Bias voltage Vbias V -15 15
Operating temperature Top ºC -10 60
Storage temperature Tst ºC -40 85
Humidity RH % 5 90
Dimension mm 111x12.5x9

Ordering Information

  • STK-AM-10-BW-PP-FA/FP-HER

  • WL—Wavelength: 10-1064nm

  • BW—Bandwidth: 5G---5GHz

  • FA/FP—Connector: FA---FC/APC; FP---FC/PC

1.2 1550nm High Extinction Ratio Electro-optic Intensity Modulator

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Key Features

  • C and L-Band Operation

  • Low insertion loss

  • 3dB bandwidth 10GHz

  • Extinction ratio 35/40dB

  • Low half-wave voltage

  • Integrated Monitor Photodiode

  • Telecordia GR-468-CORE

Applications

  • Microwave fiber link

  • Quantum communication

  • Optical pulse generation

  • Optical fiber sensing system

  • Laser mode locking

The 1550nm High Extinction Ratio LiNbO3 electro-optical intensity modulator based on the M-Z push-pull structure has a low half-wave voltage and stable physical and chemical characteristics, and the device has a high response rate, high extinction ratio(>40dB) and is therefore widely used in microwave fiber link, Quantum communication, optical Q-switched systems, laser mode-locking, and fiber sensing .

Schematic diagram

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Parameters Symbol Min. Typ. Max. Unit
Optical Parameters
Wavelength 1525 1565 nm
Insertion loss(with connector) IL 4 5 dB
Optical return loss ORL -45 dB
Extinction ratio @DC ER@DC 35 40 dB
Fiber Input Panda PM Fujikura SM 15-P-8/125-UV/UV-400
Output Panda PM Fujikura SM 15-P-8/125-UV/UV-400
Fiber interface FC/PC、FC/APC or user specified
Electrical Parameters
Bandwidth(-3dB) S21 10 12 GHz
Rise time (10%~90%) Tr 35 ps
Half-wave voltage Vpi RF Vπ@50KHz 5 V
Bias Vπ@Bias 6 V
Electrical return loss S11 -12 -10 dB
Photodiode Responsivity RP 10-3 A/W
Input impedance RF ZRF 50
Bias ZBIAS 1M
Electrical interface SMA(f)
Dimension 111x12.5x9 mm

Absolute Maximum Ratings

Parameters Symbol Unit Min. Typ. Max.
Input optical power Pin,Max dBm 20
RF input power dBm 28
Bias voltage Vbias V -20 20
Operating temperature Top ºC -10 60
Storage temperature Tst ºC -40 85
Humidity RH % 5 90

Characteristic Curve

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Ordering Information: STK-AM-WL-BW-PP-FA/FP-ER

  • WL—Wavelength:15-1550nm

  • BW—Bandwidth:10G---10GHz 20G-20GHz

  • FA/FP—Connector:FA---FC/APC; FP---FC/PC

  • ER----Extinction Ratio: 35dB, 40dB

1.3 10GB 1550nm All-in-one Electro-optic Modulator STK-MU-15-NRZ

We can provide with the driver for the above electro-modulators and integrate the modulator, amplifier and relevant controllers together. The user can manually or automatically set the bias points. At the manual setting mode, the bias can be displayed and the EO modulator and amplifier individually operate. At the automatic setting mode, the user can set various bias points according to the demand and the bias point is locked and displayed. The modulation performance of the modulator is not influenced by external factors such as environment temperature and vibration.

electro-optic modulator EOM

Symbol Min Typical Max Unit
Optical parameters
Wavelength l 1520 1550 1610 nm
Crystal LiNbO3
Insertion loss @Peak IL 4.5 5.5 dB
@Q IL 7 8 dB
Optical return loss ORL -45 dB
Extinction ratio @DC ER@DC 25 28 dB
Fiber Input Panda PM Fujikura SM 15-P-8/125-UV/UV-400
Output Corning SMF-28
Electrical parameters
Bandwidth (-3dB) S21 10 12 GHz
Working speed 10K 12.5G bps
Input signal format NRZ
Input signal amplitude Vi 0.25 0.4 0.8 Vpp
Half-wave voltage @10Gbps 4.5 5.0 V
Dynamic extinction ratio@10Gbps NRZ DER 12 dB
Rise time (10%-90%) Tr 30 35 ps
Additional vibration* JitterRMS 1.1 1.7 2.0 ps
Amplification gain G 0 25 dB
Loss from waves S11 -12 -10 dB
Input impedance @RF input ZRF 50 W
Manual setting mode
Bias voltage Vbias -10 10 V
Adj. accuracy 0.1 V
Automatic setting mode
Bias Null, Q+/-, Peak
Vibration period F 1 KHz
Vibration amplitude Vpp 2%Vπ
Harmonic extinction ratio 40 50 dB
Optical power stability DP 0.1 dB
Duty 45 55 %
Other parameters
Input interface SMA(f)
Optical interface Input FC/APC PM
Output FC/APC SM
Input power VDC AC 220 V
Dimension LxWxH 270x300x90 mm
Weight <5 kg
Port RS232
Display contents Manual Amplification gain, real-time bias voltage
Automatic Amplification gain, bias Vpi, real-time bias voltage, bias lock status

EOM, electro-optic modulator

Ordering Information: STK-MU-W-XX-BW-FB-YY-M/A

  • W: wavelength such as 15-1550nm, 13-1310nm, 10-1064nm

  • XX: modulation method such as NRZ, DPSK, DQPSK, DPQPSK, AN, PM

  • BW: bandwidth such as 02-2.5G, 10-10G, 20-20G, 40-40G

  • FB: input/output fiber type such as PP (input & output are PM), PS (input is PM and output is SM)

  • YY: fiber connector such as FA-FC/APC, FP-FC/PC

  • M/A: control mode, M is manual and A is automatic.

2. Electro-optic Phase Modulator

The STK-KY-PM series electro-optic phase modulator utilizes the electro-optical effect of lithium niobate to achieve phase modulation of optical signals, and uses titanium diffusion or proton exchange process to fabricate optical waveguides, which can achieve dual-polarization or single-polarization phase modulation. It has low insertion loss, high modulation bandwidth, low half-wave voltage, high damage optical power, etc. This product is mainly used for optical chirp control in high-speed optical communication systems, phase delay in coherent communication systems, the generation of optical sidebands, phase modulation in quantum communication, reducing stimulated Brillouin scattering (SBS) in analog optical fiber communication systems and other fields.

electro-optic modulator

Key Features

  • Wavelengths optional

  • Low half-wave voltage

  • Low insertion loss

  • High damage optical power

Applications

  • Optical fiber sensing systems

  • Optical fiber communication

  • Laser coherent synthesis

  • Phase delay (movement)

  • Quantum communication

Parameters Symbol STK-PM830-1 STK-PM1064-1 STK-PM1550-1 STK-PM1550-2
Wavelength 830+/-40 1064+/-60 1550+/-50nm
Insertion loss IL <5 dB <4 dB <4 dB 4 dB
Optical return loss ORL -40 dB -45 dB -45dB -40 dB
Bandwidth (-3dB) S21 2.5GHz 10GHz- 300MHz 10GHz
Rise time 10%~90% tr 150ps 35ps 1ns 35ps
Vpi@50KHz 5V 4.5V 4V 4V
Input resistance ZRF 50 1M 50
Electrical interface SMA(f) 3pin SMA(f)
Electrical return loss S11 <-10dB
Input/output fiber PM Panda slow axis alignment
Fiber connector FC/APC or customer specified
Operating temperature Top -10~60C
Storage temperature Tst -40~80C
RF input power Pi <28dBm
Maximum input
optical power
Po 30mW 100mW 100mW 100mW

2.1 1550nm Optical CS-SSB Modulation Modules

The STK-MU-SSB-15 series product is an optical CS-SSB modulation module developed by our company. The modulation module integrates Mach-Zehnder dual parallel modulators, bias point control circuits, 90 degree hybrid splitter, can achieve stable and reliable single sideband modulation, and can switch between left and right sideband control as needed. This product is mainly used in Brillouin fiber sensing systems, microwave photonics, gas detection and other fields.

electro-optic phase modulator

Key Features

  • Wavelength C-band

  • Sideband suppression ratio:>30dB

  • Carrier suppression ratio: >26dB

  • Up and down sidebands

  • Convenient to use and reliable

Applications

  • Optical fiber sensing system

  • Microwave photonics

  • Gas detection

  • Optical fiber communication systems

Parameters Symbol Min. Typ. Max. Unit
Carrier Optical Source Parameters (Provided by the user)
Laser type DFB source or wavelength tunable source
Wavelength l 1510 1560 nm
Line width Dn - 1 MHz
Polarization extinction ratio PER 20 - dB
Power Pi 10 100 mW
Modulator Specification Parameters
Modulator type X-cut double parallel M-Z modulator
Modulator bandwidth S21@3dB BW 10 12 - GHz
Insertion loss IL 7 8 dB
Return loss RL -45 -50 - dB
Bias Controller Parameters
Automatic feedback bias controller Jitter mode
Jitter signal frequency 400 1000 1400 Hz
Jitter signal amplitude 10 50 1000 mV
Preset work point Lowest point
CS-SSB Optical Output Signal
Single sideband modulation range* F 1 12 GHz
Input RF power PRF -5 5 dBm
Sideband suppression ratio @1550nm 30 35 - dB
Carrier suppression ratio @1550nm 26 32 dB
Interface
Input fiber Panda type polarization-maintaining fiber
Output fiber Panda type polarization-maintaining fiber
Fiber optic interface PM FC/APC Slow axis alignment
Input RF signal interface SMA(50Ω)
Bias controller communication interface J30J
Other Parameters
Operating temperature To +15 - +35 ºC
Stored temperature Ts -40 - +75 ºC
Power supply V - 15 - V
Module size LWH 160*125*20 mm
Weight - 0.3 - Kg

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3. Drive Module for Electro-optic Modulator

electro-optic modulator

Key Features

  • 10G, 20G, 40GHz optional bandwidth

  • Gain> 25dB

  • Saturated output Max.25dBm (11Vpp)

  • Rise time Min.<8ps

  • Low jitter

  • DC12V power supply

  • Easy to use

Applications

  • High-speed optical fiber communication system

  • Quantum communication

  • Picosecond pulse amplification

  • Optical fiber sensing system

electro-optic modulator

Product List

  • 10G driver module

  • 10G high output driver module

  • 20G driver module

  • 40G driver module

The STK-KY-MD-XX series electro-optic modulator driver is a broadband, high-output driver amplifier mainly used for lithium niobate electro-optical intensity and phase modulator. Its working bandwidth is up to 30K ~ 40GHz, and it can achieve a maximum of 42Gbps NRZ wideband signal amplification up to 8Vpp. It is mainly used in high-speed optical fiber communication systems, quantum communication, picosecond pulse amplification, and optical fiber sensing systems.

Parameters Symbol Unit STK-MD-10G STK-MD-10G-HO STK-MD-20G STK-MD-40G
Bandwidth(-3dB) S21-High GHz >10 >8 >20 >35
S21-Low KHz 30 100 30 30
Data rate bps 100k~12.5G 100k~10G 100k~25G 100k~42G
Gain G dB >26 >30 >28 >28
Gain ripple DG dB <3 <3 <3 <3
Output amplitude Vout Vpp 8 11 8 8
Saturated output power Ps dBm 23 25 23 23
Rise time (10% -90%) Tr ps 35 40 18 8
Jitter JitterRMS ps <2 <2 <1 <1
Isolation S12 dB <-40
Electrical return loss S11 dB <-12 <-10 <-10 <-10
RF connector SMA(f) K(f)
Operating Voltage VDC V DC 12V
Working current Io mA <500
Dimensions LxWxH mm 50x33x15

Absolute Maximum Ratings

Parameters Symbol Unit Min. Typ. Max.
Input signal amplitude Vin Vpp 1.5
Operating Voltage DC V 11.5 13
Operating temperature Top ºC -20 60
Storage temperature Tst ºC -40 85

Characteristic Curve

electro-optic modulator eom

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Typical Application

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4. STK Series Dual Parallel High-speed IQ Modulator

STK-IQ-15-20G-PP-FA

Features:

  • Low insertion loss.

  • Low half-wave voltage

  • High extinction ratio

  • Built-in detector

Application:

  • Single Side Band modulation.

  • QPSK, QAM, OFDM modulation

  • FWCW LiDAR

Introduction

STK-IQ-15-20G-PP-FA is a wideband, low insertion loss dual parallel Mach Zehnder interference modulator, which is prepared by Titanium diffusion process, with high bandwidth and low driving voltage. The dual parallel IQ modulator integrates two sub-MZs and an external master MZ with essentially the same structure and performance, as shown in Figure 1. It contains two RF signal input ports of I and Q channels, and three bias voltage ports of MZ structure, which has a high integration, stable working performance, so can independently realize single-sideband modulation and QAM modulation methods such as carrier suppression.

The operating wavelength of the dual parallel IQ modulator is C+L band, 3dB bandwidth can up to 25GHz. It uses 2.92mm female connector, input and output are Panda type polarization maintaining fiber, and optical fiber connector can choose FC/APC or FC/PC. It has two built-in monitoring PDs and the corresponding bias point control circuit, to realize the modulator is not affected by the external environment and works stably for long time. It mainly used in QAM and other high-speed optical fiber communication and distributed optical fiber sensing and other fields. For the application environment, we can provide industrial grade -40~70 °C, military grade -55~70 °C and anti-irradiation aerospace grade products.

Parameters

Parameters Symbol Min. Typ. Max. Unit
Wavelength λ 1530 1550 1610 nm
Crystal Lithium Niobate X-Cut Y-Prop
Insertion loss IL 5 6.5 dB
Extinction ratio @DC ER 20 23 dB
3dB Bandwidth BW 20 25 GHz

Electrical Return loss

S11 -12 -10 dB
DC half-wave voltage VπDC1.2 6 7 V
VπDC3 7 8 V

RF half-wave voltage

VπRF@50KHz 5 6 V
Impedance ZRF 50 Ω
Optical Return loss ORL 40 45 dB
Polarization Extinction Ratio PER 20 23 dB

Absolute Maximum Ratings

Parameters

Symbol Unit Min. Typ. Max.
RF input power RPi dBm 27
Optical input power OPi dBm 20
Bias voltage Vb V -15 15
Operating temperature* Top ºC -10 70
Storage temperature Tst ºC -40 85
Humidity RH % 5 90

Typical Curve:

Dimension:

Pin definition

PIN

Function Note

IN

Optical input Panda PM fiber (slow axis), FC/APC

OUT

Optical input Panda PM fiber (slow axis) or SM fiber, FC/APC

RF1,2

RF1/2 input 2.92 female K

1

Ground GND

2,3,4

DC1, DC2, DC3 + DC bias

5,6

PD1 -/+ PD1 Cathode/Anode

7,8

PD2 -/+ PD2 Cathode/Anode

SCQ Series Electro-optic Light Modulators

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SCQ series electro-optic modulators have the features of low insertion loss, wide bandwidth, low half-wave voltage etc and are to be used in space optical communication, time base, pulse generator and quantum optics etc.

SCQ series electro-optic modulators are mainly divided into two groups: intensity modulators and phase modulators. Their working wavelengths are 780nm, 850nm, 1064nm, 1310nm, 1550nm and 2000nm。Other wavelengths are available upon request.

Definition of Part Numbers: SCQ-XX-WW-XG-F-FC

  • XX: modulator type. AM is intensity modulator and PM is phase modulator.

  • WW: operation wavelength, such as 850nm, 1064nm, 1310nm,1550nm and 2000nm

  • XG: operation bandwidth, such as 2.5G, 10G, 40G

  • F: In-out fiber such as PP (PM/PMF)

  • FC: fiber connector such as FA (FC/APC), FP (FC/PC)

1. SCQ Series Intensity Modulators

Part number Operation wavelength nm Min wavelength nm Max wavelength nm Bandwidth Hz In/out fiber Fiber connector
SCQ-AM-850-10G 850 830 870 10G PM/PM FA, FP
SCQ-AM-1064-10G 1060 980 1150 10G PM/PM FA, FP
SCQ-AM-1310-2.5G 1310 1290 1330 2.5G PM/PM FA, FP
SCQ-AM-1550-2.5G 1550 1530 1565 2.5G PM/PM FA, FP
SCQ-AM-1550-10G 1550 1530 1565 10G PM/PM FA, FP
SCQ-AM-1550-20G 1550 1530 1565 18G PM/PM FA, FP
SCQ-AM-1550-40G 1550 1530 1565 28G PM/PM FA, FP

1.1 SCQ-AM-1310 Series 1310nm Intensity Modulators

The LiNbO3 intensity modulator is widely used in high-speed optical communication system, laser sensing and ROF systems because of well electro-optic effect. The SCQ-AM series based on MZ structure and X-cut design, has stable physical and chemical characteristics, which can be applied both in laboratory experiments and industrial systems.

Features:

  • Low insertion loss

  • Bandwidth: 2.5GHz

  • Low half-wave voltage

  • Customization option

Applications:

  • ROF systems

  • Quantum key distribution

  • Laser sensing systems

  • Side-band modulation

Optical Parameters:

Parameter Symbol Min Typ Max Unit
Operating wavelength 1290 1310 1330 nm
Insertion loss IL 4 5 dB
Optical return loss ORL -45 dB
Switch extinction ratio @DC ER@DC 20 23 dB
Dynamic extinction ratio DER 13 dB
Optical fiber (Input port) PM Fiber (125/250μm)
Optical fiber (Output port) PM Fiber or SM Fiber (125/250μm)
Optical fiber interface FC/PC、FC/APC Or Customization

Electrical Parameters:

Parameter Symbol Min Typ Max Unit
Operating bandwidth (-3dB) S21 2.5 GHz
Half-wave voltage (RF) VΠ@1KHz 3 4 V
Half-wave voltage (Bias) VΠ@1KHz 3.5 4.5 V
Electrical return loss S11 -12 -10 dB
Input impedance (RF) ZRF 50 W
Input impedance (Bias) ZBIAS 1M W
Electrical interface SMA(f)

Limit Conditions:

Parameter Symbol Unit Min Typ Max
Input optical power Pin, Max dBm 20
Input RF power dBm 28
ias voltage Vbias V -15 15
Operating temperature Top -10 60
Storage temperature Tst -40 85
Humidity RH % 5 90

Order Information:

SCQ AM 13 2.5G XX XX
SCQ series Type:

AM---Intensity Modulator

Wavelength:

13---1310nm

Operation bandwidth:

2.5G---2.5GHz

In-Out Fiber type:

PP---PM/PM

Optical connector:

FA---FC/APC

FP---FC/PC

SP---Customization

PORT Symbol Note
In Optical input port PM Fiber (125μm/250μm)
Out Optical output port PM and SM Fiber option
RF RF input port SMA(f)
Bias Bias control port 1,2 Bias, 34-N/C

2. SCQ Series Phase Modulators

Part number Operation wavelength nm Min wavelength nm Max wavelength nm Bandwidth Hz In/out fiber Fiber connector
SCQ-PM-780-10G 780 760 800 10G PM/PM FA, FP
SCQ-PM-850-10G 850 780 890 10G PM/PM FA, FP
SCQ-PM-1064-300M 1060 980 1150 300M PM/PM FA, FP
SCQ-PM-1064-10G 1060 980 1150 10G PM/PM FA, FP
SCQ-PM-1310-10G 1310 1290 1330 10G PM/PM FA, FP
SCQ-PM-1550-300M 1550 1530 1565 300M PM/PM FA, FP
SCQ-PM-1550-10G 1550 1530 1565 10G PM/PM FA, FP
SCQ-PM-1550-20G 1550 1530 1565 20G PM/PM FA, FP

2.1 SCQ-PM Series 1310nm Electro-optical Phase Modulators

The LiNbO3 phase modulator is widely used in a high-speed optical communication system, laser sensing, and ROF systems because of well electro-optic effect. The SCQ-PM-1310 series, based on Ti-diffused technology, has stable physical and chemical characteristics, which can meet most applications in laboratory experiments and industrial systems.

Features:

  • Low insertion loss

  • Polarization-maintaining

  • Low half-wave voltage

  • Dual-polarization option

Application:

  • Optical communication

  • Quantum key distribution

  • Frequency shifting

Optical parameters:

Parameter

Symbol Min Typ Max Unit

Operating wavelength

l 1290 1310 1330 nm

Insertion loss

IL 3.5 4 dB

Optical return loss

ORL -45 dB

Polarization extinction ratio

PER 20 dB
Optical fiber Input port PM fiber(125/250μm)
Output port PM fiber(125/250μm)

Optical fiber interface

FC/PC、FC/APC Or Customization

Electrical Parameters:

Parameter Symbol Min Typ Max Unit
Operating bandwidth(-3dB) S21 10 12 GHz
Half-wave voltage @50KHz 2.7 3 V
Electrical return loss S11 -12 -10 dB
Input impedance ZRF 50
Electrical interface SMA(f)

Limit parameters:

Parameter Symbol Unit Min Typ Max
Input optical power Pin,Max dBm 20
Input RF power dBm 28
Operating temperature Top -10 60
Storage temperature Tst -40 85
Humidity RH % 5 90

Ordering Information:

SCQ PM 13 XX XX XX
SCQ series Modulator type:

PM--- Phase modulator

Operating wavelength:

13---1310nm

Operating bandwidth:

10---10G

Input & output fiber:

PM/PM

Connector:

FA ---FC/APC

FP ---FC/PC

SP---user specified

PORT Symbol Note
In Optical input port PM Fiber (125μm/250μm)
Out Optical output port PM and SM Fiber option
RF RF input port SMA(f)
Bias Bias control port 1,2 Bias, 34-N/C

3. Drivers

3.1 SCQ-RF Series Drivers

SCQ-RF broadband RF amplifier (or called as driver) is a desktop instrument specially designed for high-speed lithium niobate electro-optic modulator. This instrument can amplify the small high-speed signal level to the higher level that can drive the modulator, thus driving the lithium niobate (LiNbO3) electro-optic modulator to work, and has good gain flatness in the broadband range.

Features:

  • High bandwidth: 10, 20 or 40 GHz

  • Variable gain

  • The output range is up to 8V

  • Highly integrated

  • Easy to use

Applications:

  • 10/20/40G optical modulating system

  • Fiber optic testing system

  • Optical fiber sensing system

Parameters of SCQ-RF-40 Driver

Parameter Unit Min Typ Max
Transmission rate Gb/s 0.0001 44
Operating frequency range Hz 50K 40G
Output voltage magnitude V 7 8 9
Gain margin V 0.3 0.4 0.6
Regulation precision dB 24 27 35
Output power P1dB V 0.1
Gain variation(ripple) dBm 20
Rise/fall time dB ±1.5
Additional jitter ps 8 12
Input/output impedance ps 0.42
Input voltage amplitude - 50 -

Input voltage standing-wave ratio VSWR

(75k to 10GHz)

1.6:1

2.25:1

Output voltage standing-wave ratio VSWR 2:1 3:1
Boundary dimension(L x W x H) mm 270 x 200 x 70
Operating voltage V AC 220
RF interface V(f)-V(f)

Limit Conditions

Parameter Unit Min Typ Max
Input voltage amplitude V 1
Working temperature ºC -10 60
Storage e temperature ºC -40 85
Humidity % 5 90

Eye Diagram

Ordering Information:

SCQ RF XX XX X
SCQ series drivers RF amplifier Operating rate:

10---10Gbps

20---20Gbps

40---40Gbps

Output characteristic:

Blank---Standard

HO---High voltage output

RZ---RZ signal amplification

Footprint:

D---Table model

3.2 MZM Bias Controller

The bias controller is specially designed for Mach-Zehnder modulators to ensure a stable operation state in various operating environments. Based on its fully digitized signal processing method, the controller can provide highly stable performance. The controller injects a low frequency, low amplitude dither signal together with bias voltage into the modulator. It keeps reading the output from the modulator and determines the condition of the bias voltage and the related error. A new bias voltage will be applied afterwards according to the previous measurement. In this way, the modulator is ensured to work under proper bias voltage.

Features:

  • Bias voltage control on Peak/Null/Q+/Q−

  • Bias voltage control on arbitrary point

  • Ultra precise control: (1) 50dB maximum extinction ratio on Null mode; (2) ±0.5◦ accuracy on Q+ and Q− modes

  • Low dither amplitude: (1) 0.1% Vπ at NULL mode and PEAK mode; (2) 2% Vπ at Q+ mode and Q− mode

  • High stability: with fully digital implementation

  • Low profile: 40mm(W) × 30mm(D) × 10mm(H)

  • Easy to use: (1) Manual operation with mini jumper; (2) Flexible OEM operations through MCU UART2

  • Two different modes to provide bias voltage: (1) Automatic bias control; (2) User defined bias voltage

Application:

  • LiNbO3 and other MZ modulators

  • Digital NRZ, RZ

  • Pulse applications

  • Brillouin scattering system and other optical sensors

  • CATV Transmitter

Ordering Information

Part No.: SCQ-RF-BC

Remark: (1) The highest extinction ratio depends on and cannot exceed modulator maximum extinction ratio. (2) UART operation is only available on some version of the controller.

Performance:

Maxim DC Extinction Ratio:

In this experiment, no RF signals were applied to the system. Pure DC extinction has been measured.

(1) Figure 3 demonstrates the optical power of modulator output, when modulator controlled at Peak point. It shows 3.71dBm in the diagram.

(2) Figure 4 shows the optical power of modulator output, when modulator controlled at Null point. It shows -46.73dBm in the diagram. In real experiment, the value varies around -47dBm; and -46.73 is a stable value.

(3) Therefore, the stable DC extinction ratio measured is 50.4dB.

Requirements for High Extinction Ratio:

(1) System modulator must have high extinction ratio. Characteristic of system modulator decides the maximum extinction ratio can be achieved.

(2) Polarization of modulator input light shall be taken care of. Modulators are sensitive to polarization. Proper polarization can improve extinction ratio over 10dB. In lab experiments, usually a polarization controller is needed.

(3) Proper bias controllers. In our DC extinction ratio experiment, 50.4dB extinction ratio has been achieved. While the datasheet of the modulator manufacture only lists 40dB. The reason of this improvement is that some modulators drift very fast. Our SCQ-RF-BC-ANY bias controllers update the bias voltage every 1 second to ensure fast track response.

Specifications:

Parameter Min Typ Max Unit Conditions
Control Performance
Extinction ratio MER 1 50 dB
CSO2 −55 −65 −70 dBc Dither amplitude: 2%Vπ
Stablization time 4 s Tracking points: Null & Peak
Stablization time 10 s Tracking points: Q+ & Q-
Electrical
Positive power voltage +14.5 +15 +15.5 V
Positive power current 20 30 mA
Negative power voltage -15.5 -15 -14.5 V
Negative power current 2 4 mA
Output voltage range -9.57 +9.85 V
Output voltage precision 346 µV
Dither frequency 999.95 1000 1000.05 Hz Version: 1kHz dither signal
Dither amplitude 0.1%Vπ V Tracking points: Null & Peak
Dither amplitude 2%Vπ V Tracking points: Q+ & Q-
Input optical power3 -30 -5 dBm
Input wavelength 780 2000 nm

1 MER refers to Modulator Extinction Ratio. The extinction ratio achieved is typically the extinction ratio of modulator specified in modulator datasheet.

2 CSO refers to composite second order. To measure CSO correctly, the linear quality of RF signal, modulators and receivers shall be

ensured. In addition, the system CSO readings may vary when running at different RF frequencies.

3 Please be noted that input optical power does not correspond to the optical power at selected bias point. It refers to the maximum optical power that the modulator can export to controller when bias voltage ranges from −Vπ to +Vπ .

Group Operation Explanation
Photodiode1 PD: Connect MZM photodiode’s Cathode Provide photocurrent feedback
GND: Connect MZM photodiode’s Anode
Power Power source for bias controller V-: connects the negative electrode
V+: connects the positive electrode
Middle probe: connects the ground electrode
Reset Insert jumper and pull out after 1 second Reset the controller
Mode Select Insert or pull out the jumper no jumper: Null mode; with jumper: Quad mode
Polar Select2 Insert or pull out the jumper no jumper: Positive Polar; with jumper: Negative Polar
Bias Voltage Connect with the MZM bias voltage port OUT and GND provide bias voltages for modulator
LED Constantly on Working under stable state
On-off or off-on every 0.2s Processing data and searching for controlling point
On-off or off-on every 1s Input optical power is too weak
On-off or off-on every 3s Input optical power is too strong
UART Operate controller via UART 3.3: 3.3V reference voltage
GND: Ground
RX: Receive of controller
TX: Transmit of controller
Control Select Insert or pull out the jumper no jumper: jumper control; with jumper: UART control

1 Some MZ modulators have internal photodiodes. Controller setup should be chosen between using controller’s photodiode or using modulator’s internal photodiode. It is recommended to use controller’s photodiode for lab experiments for two reasons. Firstly, controller photodiode has ensured quality. Secondly, it is easier to adjust the input light intensity. Note: If using modulator’s internal photodiode, please make sure that the output current of photodiode is strictly proportional to input power.

2 Polar pin is used to switch the control point between Peak and Null in Null control mode(determined by Mode Select pin) or Quad+ and Quad- in Quad control mode. If jumper of polar pin is not inserted, the control point will be Null in Null mode or Quad+ in Quad mode. Amplitude of RF system will also affect the control point. When there is no RF signal or RF signal amplitude is small, controller is able to lock the work point to correct point as selected by MS and PLR jumper. When the RF signal amplitude exceeds certain threshold, polar of the system will be changed, in this case, the PLR header should be in the opposite state, i.e. the jumper should be inserted if it is not or pulled out if it is inserted.

Typical Application:

The controller is easy to use as follows:

Step1. Connect 1% port of the coupler to the photodiode of the controller.

Step2. Connect bias voltage output of the controller (through SMA or 2.54mm 2-pin header) to bias port of the modulator.

Step3. Provide controller with +15V and -15V DC voltages.

Step4. Reset the controller and it will start to work.

NOTE. Please be ensured that RF signal of the whole system is on before resetting the controller.

STOL Series Fiber Coupled Optical Modulators

The basic construction of a modulator starts with a wafer made of lithium niobate. Embedded in the wafer is a waveguide used to direct the light through the modulator. At least two electrodes are placed on the top surface of the wafer near the waveguide. These electrodes are used to modulate the signal by utilizing the Pockels effect. Simply put, the Pockels effect is when an electric field applied to a crystal causes the refractive index to change. By changing the refractive index of the crystal, the light traveling through the waveguide changes phase which is used to modulate the signal.

We offer phase and intensity modulators. Our large variety of modulators makes it easy to find a suitable device for your project. The modulators we offer come with operational wavelengths from 850–1550nm and 3dB bandwidths ranging from 5– 50GHz. These high-performance modulators have a low insertion loss, high extinction ratio, can operate with high optical power, and offer excellent stability. Additionally, we offer modulators with PM outputs and low drive voltages to suit a wider variety of applications.

1. Phase Modulator

A phase modulator consists of a single waveguide seated in lithium niobate with two electrodes placed on either side of the waveguide (Figure below). This is the simplest type of modulator.

Out phase modulator is a high performance LiNbO3 modulator. This phase modulator can provide phase modulation with x-cut Annealed Proton Exchange (APE) process with a low driving voltage. It has low insertion loss and high transmission power. The modulator uses polarization maintaining input and output fibers, making it easy to integrate with other optical components. Contact us for more information

Features:

  • Polarization maintaining output

  • Low insertion loss (≤4.0dB)

  • High input power handling capability

  • Cabling 900µm tubing

  • Polarization extinction ratio ≥ 21dB

Applications:

  • Analog modulation

  • Pulse generation

  • Quantum photonic

  • Active mode locking laser

Specifications:

Model Wavelength (nm) Bandwidth (GHz) Maximum Input optical power (mW) Vπ (V) Optical return loss (≤ dB) RF port connectors Dimensions

(mm)

STOL-PM-785-0.5 785 0.5 5 4V @ 1GHz -30 K connector 96x25x16.3
STOL-PM-785-5 785 5.0 5 5V@ 1GHz -30 K connector 96x25x16.3
STOL-PM-785-10 785 10 20 5.2V @ 1GHz 30 K connector 96x25x16.3
STOL-PM-785-20 785 20 5 6.8V @ 1GHz 30 K connector 96x25x16.3
STOL-PM-850-0.2 850 0.2 20 1.1V@0.1GHz 40 K connector 65x11.5x5.8
STOL-PM-1064-20 1064 20 300 5.5V @1GHz 40 V female 87x14.5x10.1
STOL-PM-1310-5 1310 5 50 6V @ 1GHz 30 K connector 96x25x16.3
STOL-PM-1310-10 1310 10 50 8.8V @ 1GHz 30 K connector 96x25x16.3
STOL-PM-1550-0.5 1550 0.5 50 8V @ 0.001GHz 30 K connector 96x25x16.3
STOL-PM-1550-5 1550 5 50 9V @ 1GHz 30 K connector 96x25x16.3
STOL-PM-1550-10 1550 10 40 10.5V @ 1GHz 30 K connector 96x25x16.3
STOL-PM-1550-0.5-PMLD 1550 0.5 50 4V@0.001GHz 30 K connector 96x25x16.3

Functional diagram:

Mechanical drawing:

2. Intensity Modulator

An intensity modulator uses the architecture of a Mach Zehnder interferometer (MZI) by splitting the waveguide into two paths and recombining them (Figure below). The electrodes are placed around the two waveguide paths to modulate the phase in the light while split. When the paths recombine, the light path undergoes either constructive or deconstructive interference depending on the phase, thereby modulating the light intensity.

Our Intensity modulator is designed for analog modulation of different frequency for satellite links, antenna remoting and RF over Fiber. By using Annealed Proton Exchange (APE) waveguide, the modulator provides low insertion loss and high-power handling capability. It features a highly linear transfer function and excellent extinction ratio. The modulator is compatible with a wide variety of modulator drivers and a separate bias port allows the modulator to operate at specific points of the transfer function.

Features:

  • Polarization Maintaining (PM) output or Single Mode (SM) output

  • Low insertion loss (≤ 4.5dB)

  • High input power handling capability

  • Low drive voltage

Applications:

  • Analog modulation

  • Pulse generation

  • Quantum photonics

  • Active mode locking laser

Specifications:

Model Wavelength (nm) Bandwidth (GHz) Max. Input optical power (mW) Vπ (V) Optical return loss (≤ dB) RF port connectors Dimensions (mm)
STOL-IM-785-0.5-PM 785 0.5 10 2.5@1KHz -45 GPO male 65 x 11.4 x 4.8
STOL-IM-785-20-PM 785 20 10 5.5@10GHz -45 V female 87 x 14.5 x 10
STOL-IM-785-40-PM 785 40 10 6.5@20GHz -45 V female 87 x 14.5 x 10
STOL-IM-850-5-PM 850 5 20 5.0@1GHz -45 V female 87 x 14.5 x 10
STOL-IM-850-10-PM 850 10 20 5.0@1GHz -45 V female 87 x 14.5 x 10
STOL-IM-850-20-PM 850 20 20 5.5@10GHz -45 V female 87 x 14.5 x 10
STOL-IM-1064-10-PM 1064 10 100 4.3@10GHz -45 K female 96.1 x 24.9 x 16.3
STOL-IM-1064-20-PM 1064 20 100 4.3@20GHz -45 K female 96.1 x 24.9 x 16.3
STOL-IM-1064-40-PM 1064 40 300 3.9@1GHz -50 V female 87 x 14.5 x 10
STOL-IM-1310-10-PM 1310 10 100 6.6@10GHz -45 K female 66 x 22 x 9
STOL-IM-1310-20-PM 1310 20 100 5@1kHz -45 K female 66 x 22 x 9
STOL-IM-1310-40-PM 1310 40 100 5.1@1GHz -50 V female 87 x 14.5 x 10
STOL-IM-1550-10-PM 1550 10 100 6@1GHz -45 K female 96 x 14 x 8.5
STOL-IM-1550-10-PMV 1550 10 100 6@1GHz -45 V female 96 x 14 x 8.5
STOL-IM-1550-10-SM 1550 10 100 5@1GHz -35 SMA 117.9 x 15.2 x 9.8
STOL-IM-1550-20-SM 1550 20 100 5.7@1GHz -45 K female/SMA 96 x 24.9 x 16.3
STOL-IM-1550-40-PM 1550 40 100 4.5@30GHz -45 V female 71 x 16 x 7

Options:

STOL-IM-785-40-PM-XX

XX HE: High Extinction Ratio

PD: internal PD

Please contact us for available options.

Functional diagram:

Mechanical drawing:

1. STOL-IM-XXX-XX-PM-PD housing, with internal PD

2. STOL-IM-XXX-XX-PM housing, no internal PD

Available accessories: ST-BCB-4

This is a compact bias control board designed to maintain the linear operating point of optical intensity modulators

3. Multi-functional integrated optical chip

The Multi-functional Integrated Optical Chip (MIOC) is the key component of Fiber Optic Gyroscope (FOG) for rotational rate sensing and inertial navigation systems. This Integrated Optic Chip device is composed of a polarizer, a Y-junction coupler and dual electro optic phase modulators. By using Lithium Niobate, the integrated optic chip is fabricated with Proton Exchange optical waveguides. It has features Polarization Extinction Ratio exceeding 60 dB that can minimize bias drift which results from polarization crosstalk induced non-reciprocity. The Fiber Optic Current Sensor (FOCS) chip is designed for fiber optic current sensing.

Features

  • 1550±20nm operation

  • PM input and output port

  • Low insertion loss 3.5 dB

  • Polarization extinction ratio > 60dB

  • Low Vπ voltage 4V

  • Unpackaged chip available

Applications:

  • Fiber optic gyroscope (FOG)

  • Fiber optic current sensor (FOCS)

  • Hydrophone and other optic sensitive fields

Specifications:

Model Wavelength (nm) Bandwidth (nm) Split ratio (%) Intensity modulation (%) Insertion loss Dimensions

(mm)

STOL-MIOC-1550-BC 1550 20 50 0.1 3.5 1x1.8x22.5
STOL-MIOC-1550-BC-P 1550 20 50 0.1 2.5 1x1.8x22.5
STOL-MIOC-1550-PG 1550 20 50 0.1 3.5 5.85x12.85x40.5
STOL-MIOC-1550-PG-P 1550 20 50 0.1 2.8 5.85x12.85x40.5
STOL-MIOC-1550-SB 1550 20 50 0.1 3.5 1.75x7x26
STOL-MIOC-1550-SP 1550 20 50 0.1 3.5 3x6.5x33
STOL-FOCS-1550-PG 1550 20 50 0.1 4.2 5.85x12.85x40.5

Functional diagram:

Mechanical drawing:

STOL-MIOC-1550-BC

4. RF Amplifier Modulator Driver

Our high gain RF amplifier module offers cost-effective solutions for microwave and analog link. It is a compact and user-friendly module that provides a high quality, single ended voltage to drive optical modulator. Featuring a 12V or 5V DC power supply, this versatile module has an anodized. Precision-machined aluminium housing designed for efficient heat dissipation during prolonged use. Most of the modulator features a manually adjustable DC bias output voltage port, to further complement its effectiveness when used with a standard optical modulator.

Applications:

  • Analog RF amplification

  • 5G wireless antenna

  • RF over fiber link

  • Digital modulation

  • General laboratory test and measurement

  • SONET/SDH

Specifications:

Model Bandwidth (GHz) S11 Characteristics (dB) Data rate (Gb/s) RF Gain (dB) Saturated output power (dBm) Gain ripple (dB) Input, output impedance (Ω) Gain adjustment range (dB) Power supply requirement
STOL-MD-9-M 3 to 9 -15 - 34 30 0.5 50 - 5V DC
STOL-MD-50E-M 45 -10 50 20 14.5 1.5 50 15 12V DC, 2A
STOL-MD-20-M 18 -10 23 19 to 24 26 0.5 50 5 12V DC, 1A
STOL-MD-12-DC 12 -10 12.5 14 to 26 26 1.5 50 6 12V DC, 1A

Please contact us for more information.

Functional Diagram and Drawings:

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