Wavelength Tunable & DFB Lasers

Wavelength Tunable & DFB Lasers

Distributed feedback (DFB) lasers provide tunable wavelength output with extremely narrow spectral width and long coherence length. Integrated modules offer further narrowing of the spectral line in a compact OEM package with a simple tuning interface

1. STG Series DFB Diode Lasers

Distributed feedback (DFB) lasers provide tunable wavelength output with extremely narrow spectral width and long coherence length. Integrated modules offer further narrowing of the spectral line in a compact OEM package with a simple tuning interface.

DFB lasers feature a grating on the chip level structure to generate feedback into the cavity which ultimately enables stable, smooth, and precise wavelength tuning via temperature control of the chip. Additional feedback or external locking methods can ensure extremely stable wavelength control through many years or decades of use.

Our DFB lasers serve a wide range of industrial, defense, medical, and scientific applications, with performance-enhancing design features that include:

  • Integrated thermoelectric coolers (TECs) to reduce current consumption and extend operating temperature range
  • Precision thermistors for accurate feedback and control of chip temperature
  • Internal isolators to protect against back reflections and to reduce noise perturbations into the laser
  • DFB Lasers in 14-pin or 7-pin package

DFB lasers provide precise single-frequency and single-spatial-mode performance with smooth tuning capability via temperature or current (chirp) tuning. We offer a range of products with high power and high bandwidth options in a rugged, single-emitter, fiber coupled 14-pin or 7-pin butterfly package. Our high power series offers options up to 100 mW with >2.5 GHz direct modulation speeds, while our high bandwidth series offers up to 18 mW with >12 GHz direct modulation speeds. In addition to the variety of standard wavelength options in the 1-1.62 mm region, additional custom options are available upon request.

Applications cover distributed temperature sensing (DTS), fiber optic telecmmunications, gas sensing, interferometry, laser Doppler vibrometry (LDV), LIDAR, RF over fiber, seed lasers, spectroscopy.

Product Code Wavelength Power Options Fiber Features
STG-AA1401, AA1406 1529-1610 nm 40, 50, 63, 80, 100 mW PM or SM
STG-AA1402 1617 nm 80 mW PM or SM
STG-AA1415 1529-1610 nm 40, 50, 63, 80, 100 mW PM or SM High isolation
STG-AA1416 1537-1565 nm 40 mW PM or SM High isolation, high efficiency TEC
STG-AA1411 1064 nm 50 mW PM or SM
STG-AA1409 1310 nm 18 mW PM or SM
STG-AA0701 1310,1527-1565 nm 10, 18 mW PM or SM High bandwidth

2. STG Series DFB Laser Modules

Building upon our proven 14-pin packaged DFB lasers, we also offers compact OEM modules with excellent linewidth performance. All the modules comprise an integrated DFB laser, low noise diode driver, and TEC controller. To operate, the user need only provide a simple 5V power supply and voltage based tuning signals for temperature or current (chirp) adjustment, if required.

The incorporation of an ultra-low noise current source for the diode offers a vastly improved linewidth. The EM650 typically provides 200 kHz linewidth in a hand-sized package, roughly 66x64 mm (2.5”x2.5”) in size. The EM750 features an additional external cavity to reduce the linewidth to approximately 10 kHz while emitting up to 50 mW out of the fiber.

Product Code Wavelength Power Options Laser Type Fiber Features

1064, 1310, 1529-1617 nm 40, 50, 63, 80, 100 mW DFB PM or SM 200 kHz typ linewidth
STG-EM750 1532-1575 nm 30, 50 mW DFB PM or SM 10 kHz typ linewidth
STG-EM655 1310, 1530, 1550, 1570 nm 10, 18 mW DFB PM or SM >12 GHz direct modulation

3. STG Series DFB Laser Modules

Our high power diode lasers feature ruggedized, epoxy-free designs intended for use in a wide range of harsh, long-life environments. Cooled and uncooled options are available to meet the most demanding diode laser applications.

Single-mode (SM) pump lasers emit a low noise, precisely controlled, polarization maintained level of light at a specific wavelength out of a small-core fiber. STG series of cooled and uncooled diode laser products are designed with precise micro-alignment that stays true and stable through wide temperature ranges and high shock/vibration environments. All SM lasers feature a fiber Bragg grating (FBG) for stable, low noise operation. Customers may select to use the laser without the grating to enable temperature tuning of the central wavelength.

The latest series of AC1409 SM lasers feature high PER performance, enabling superior PM pump combining and other polarization extinction ratio (PER) sensitive applications. In addition to standard products, output wavelength and other options can be customized for new applications.

Multi-mode (MM) lasers offer high output power. We offer standard 14-pin fiber-coupled package designs and other formats upon request. Cooled designs allow for wavelength tuning of the output for even greater wavelength control of the laser, while uncooled options feature higher power output.

Our lasers are designed to ensure highly reliable operation across wide temperature and environmental conditions.

A variety of low size, weight, and power custom designs can be employed to meet demanding aerospace and space mission applications. We also offer design and qualification services to ensure high reliability and long life under launch conditions for space mission applications.

Applications cover fiber lasers, fiber optic, gyroscopes. Inspection, infrared sensing, life science, marking.

Product Code Fiber Package Wavelength Cooling Power
STG-AC1409 PM or SM 14-pin 974, 976, 980 nm Active 600, 700 mW
STG-EM278 PM or SM mini-DIL 976 nm None 200 mW
STG-EM322 through


0.15 or 0.22 NA 14-pin 915, 940, 960 nm None 7 W
STG-EM328, EM329 0.15 or 0.22 NA 14-pin 975 nm None 6 W
STG-EM330 through


0.15 or 0.22 NA 14-pin 915, 940, 960, 975 nm Active 5 W
EM339 0.15 or 0.22 NA 14-pin 808 nm Active 3 W

For all STG series diode lasers, STG-EM595 diode drivers can be used for driving.

4. STC Series DFB/ DBR/ VCSEL Laser

We offer DFB/ DBR/ VCSEL laser, which is special designed for gas detection such as CH4, H2S, NH3, H2O, CO, CO2, C2H4, HF, C2H2, etc. Features with narrow linewidth up to 2MHz, ultra compact dimension, high power and wavelength stability, they are widely used in fiber gas detection, seed light source, fiber optical sensing field, etc.

DFB lasers


  • Stable wavelength and output power;
  • Narrow linewidth;
  • No jump mode output in operating current range


  • Optical fiber gas detection system;
  • Optical sensing;
  • Fiber communications

Laser Wavelength for Gas Detection

as Composition Chemical Formula Absorption Spectrum
Methane CH4 1650.9 nm, 1653.7 nm
Hydrogen sulfide H2S 1578 nm, 1590 nm
Ammonia NH3 1512 nm
Carbon monoxide CO 1567 nm
Carbon dioxide CO2 1580 nm
Acetylene C2H2 1532.68 nm
Ethylene C2H4 1620 nm, 1625 nm, 1627 nm
Hydrogen fluoride HF 1268.7 nm, 1273 nm, 1305 nm, 1312 nm
Water H2O 1368 nm, 1392 nm

Lasers for Fiber Communication:

Model Wavelength Output Power
STC-TEM-F-1268DFB 1268 nm 1-10 mW
STC-TEM-F-1273DFB 1273 nm 1-10 mW
STC-TEM-F-1305DFB 1305 nm 1-10 mW
STC-TEM-F-1310DFB 1310 nm 1-10 mW
STC-TEM-F-1312DFB 1312 nm 1-10 mW
STC-TEM-F-1368DFB 1368 nm 1-10 mW
STC-TEM-F-1392DFB 1392 nm 1-10 mW
STC-TEM-F-1450DFB 1450 nm 1-20 mW
STC-TEM-F-1470DFB 1470 nm 1-20 mW
STC-TEM-F-1490DFB 1490 nm 1-20 mW
STC-TEM-F-1512DFB 1512 nm 1-10 mW
STC-TEM-F-1532DFB 1532 nm 1-20 mW
STC-TEM-F-1540DFB 1540 nm 1-20 mW
STC-TEM-F-1550DFB 1550 nm 1-30 mW
STC-TEM-F-1560DFB 1560 nm 1-20 mW
STC-TEM-F-1567DFB 1567 nm 1-10 mW
STC-TEM-F-1573DFB 1573 nm 1-20 mW
STC-TEM-F-1578DFB 1578 nm 1~10 mW
STC-TEM-F-1580DFB 1580 nm 1~10 mW
STC-TEM-F-1590DFB 1590 nm 1-20 mW
STC-TEM-F-1610DFB 1610 nm 1-20 mW
STC-TEM-F-1620DFB 1620 nm 1~10 mW
STC-TEM-F-1625DFB 1625 nm 1~10 mW
STC-TEM-F-1627DFB 1627 nm 1~10 mW
STC-TEM-F-1651DFB 1651 nm 1~10 mW
STC-TEM-F-1653DFB 1653 nm 1~10 mW

5. STC Series Wavelength Tunable Laser

We offer wavelength tunable laser, the output wavelengths can be changed continuously within a certain range. Tunable lasers come with good beam quality, high stability and long life time, they are widely used in spectroscopy, photochemistry, medicine, biology, integrated optics, laser processing, etc.

tunable diode laser


  • Good beam quality;
  • Compact design;
  • High stability;
  • Long life time;
  • Easy operation


  • Spectroscopy;
  • Medicine; Photochemistry;
  • Biology;
  • Integrated optics

◆Tunable Diode Laser

Tunable Wavelength Band Model Output Power Spectral Linewidth
403~407 nm STC-TUN-403~407 1~30 mW <0.1 nm
408~412 nm STC-TUN-408~412 1~30 mW <0.1 nm
448~452 nm STC-TUN-448~452 1~10 mW <0.1 nm
518~522 nm STC-TUN-518~522 1~10 mW <0.1 nm
634~643 nm STC-TUN-634~643 1~10 mW <0.1 nm
652~658 nm STC-TUN-652~658 1~10 mW <0.1 nm

◆Tunable Ti:Sapphire Laser

Tunable Wavelength Band Model Output Power Spectral Linewidth
770~840 nm STC-TUN-TiN-770~840 1~400 mW <40 pm
770~840 nm STC-TUN-Ti-770~840 1~1000 mW <2 nm
770~840 nm STC-TUN-TiA-770~840 1~1300 mW <2 nm

◆Tunable Infrared Laser

Tunable Wavelength Band Model Output Power Spectral Linewidth
1400~1800 nm STC-TUN-W-1400~1800 1~2000 mW <2 nm
2600~4450 nm STC-TUN-W-2600~4450 1~1000 mW <2 nm

6. STDL Series DFB Diodes

(1) 16xx nm DFB

The STDL-DFB 6 XXXX series is an InGaAsP based distributed feedback laser series in available in a TO 56 package, with an aspherical lens 1653 nm wavelength for gas sensing is available in BTF chip form. These devices have been optimized for & photonics telecommunication, test measurements as well as sensing applications.

DFB diodes


  • OTDR
  • Photonic Sensing (gas)
  • Biomedical Sensing
  • Telecommunication

Features & Performance

  • Uncooled 16xx n m DFB laser
  • Operating temperature from -5C to 70C
  • 1653nm selection for Gas Sensing
  • Optical output min. 3mW (TO)
Part No nm Po (mW) Pkg
STDL-DFB65003T-A 1650 3 TO-56
STDL-DFB62503T-A 1625 3 TO-56
STDL-DFB61003T-A 1610 3 TO-56
STDL-DFB65306D 1653 6 Chip
STDL-DFB65304D 1653 4 Chip
STDL-DFB65303T-A 1653 3 TO

Customised wavelengths available.

DFB laser diode DFB laser diode

(2) 1310nm DFB (20mW)

The STDL-DFB31020D is an InGaAsP based distributed feedback laser chips. These devices have been optimized for telecommunication test & measurements as well as Datacom applications.

DFB laser


  • OTDR
  • FTTx
  • PSM-4
  • CWDM

Features & Performance

  • Uncooled operation from 5 to 70°C
  • Output power (CW) of 20mW at 25°C, Iop 47mA (typical)
  • Typical SMSR >=35dB
  • Designed for CW transmission
Part No. Wavelength nm Laser power Po (mW) Pkg
STDL-DFB31020D 1310 20 Chip
STDL-DFB31040D 1310 40 Chip
STDL-DFB31070D 1310 70 Chip

Custom wavelengths available.

DFB diode DFB laser

Parameters Symbol Typical Unit
Chip Size L x W xH 250* x 200 x100 mm
Emission Spot (from Chip Edge) d 65 mm
Wire Bond Pad x,y 100 x100 mm

*L is longer, for higher power devices.

7. Swept Wavelength Tunable Semiconductor Lasers, Broadsweepers

The Broadsweepers series is a new family of tunable semiconductor lasers intended for applications that require fast and precision wavelength tuning with high sweep-to-sweep reproducibility of the "instantaneous" wavelength. Among all possible applications, the most important are Optical Coherence Tomography (including Full Field OCT), biomedical imaging, interferometry, optical spectroscopy, fiber-optic sensing and optical component characterization.

The optical scheme of the Broadsweeper is based on an external fiber-optic ring cavity and a broadband Semiconductor Optical Amplifier (SOA), working as a gain medium. The wide bandwidth feature of the SOA module and its high fiber-to-fiber gain allow reaching a wavelength tuning range of more than 50 nm at 3 mW of the output power.

The wavelength tuning technique involves the use of an Acousto-Optical Tunable Filter (AOTF) with a very narrow spectral passband ranging from 0.2 to 0.8 nm (FWHM). The AOTF is actively temperature controlled for high spectral stability of laser radiation. Since the laser cavity contains no mechanically moving components, high accuracy of wavelength selectivity and excellent wavelength reproducibility in sweep operation are ensured. Due to the perfect AOTF tuning characteristic, the laser provides k-linear wavelength tuning over a wide spectral range.

As well as the SOA and the AOTF, the other important elements of the laser are a fiber-optic coupler, optical isolator and in-line optical power monitor. All of them feature a unique customized design perfectly fitted for broadband spectral applications. Collimating optics used with the AOTF is relied on high-quality aspherical lens. This optics is aberration-free that allows obtaining not only a well-collimated laser beam required for effective operation of the AOTF but also maximum efficiency of coupling the light into the output optical fiber. The filter and the optics are packaged into one monolithic metal housing, thereby ensuring reliable day-after-day operation without misalignment. The external cavity of the laser uses a PANDA-type polarization maintaining (PM) fiber. This provides a well-defined state of polarization as well as high stability of laser polarization in time and under different ambient conditions. The only front-panel optical port delivers an optical signal with ultra-low amplified spontaneous emission ( < -50 dB) and a polarization extinction ratio (PER) of min. 18 dB. Most of the fiber-optic components are built on the fast-axis-blocked technology that also guarantees high values of the PER at the laser output.

The output polarization is provided in the slow axis of the fiber that is precisely aligned to the connector key.

The laser is housed in a compact metal case suitable for applications on the bench and in the rack. The device has a modular design that incorporates several plug-in modules (power supplies, tunable optical module, current and temperature driving module, central processing unit, etc.) into one single mainframe. Our driving electronics provides precise, reliable and safe control of the laser in all modes of operation. All the necessary laser diode protective measures such as transient suppression, over-temperature protection, open-circuit protection and laser current limit are implemented. The optical power control loop in combination with the very fast laser current source adjusted for automatic-power-control mode allow operation with a flat-top-shaped tuning characteristic at all specified sweep speeds.

The laser provides the following modes of operation:

  • CW operation at any single wavelength within the full tuning range. The operating wavelength is adjustable from the front panel or from a computer. Under computer control, typical switching between two different wavelengths is done in less than 100 ms. The user can select any wavelength within the full wavelength range with a 50-pm resolution.
  • Continuous sweeps over the full tuning range or over the band of interest (within the full tuning range) not shorter than 5 nm. Both the internal triggering and the external triggering are available.
  • Continuous switching between any two wavelengths within the full tuning range at a certain repetition frequency. The range of frequencies includes 13 factory-set values. Customized settings for the repetition frequency are possible upon request.

When internally triggered, the device produces synchronizing pulses. BNC-connectors necessary to synchronize the laser with your measuring equipment are located on the rear panel of the device. In the external triggering mode, the device responds to incoming TTL-compatible trigger signals.

The Broadsweeper offers the maximum output power of 3 mW. For powerful applications, the device can additionally be equipped with an optical power booster elevating the power up to 20 mW.

The laser output is performed through the front-panel high precision PM optical socket for an FC/APC connector with the narrow key (2.0 mm). The device is supplied with a PM optical patch cable. An SM optical patch cable is also available on request.

Remote Control Capability

The device has an RS-232 DTE port for remote control from a computer. The necessary connectivity software is supplied with the instrument.

Laser Safety Measures

To fulfill the requirements of IEC 60825-1 Ed. 2 2007-03, the instrument is equipped with laser safety measures including: the master key control, remote interlock connection, visual/audible alarm, informational warning stickers, etc.

Standard Models Available For Ordering

Depending on the spectral band and sweep speed, there are several models of the product to choose from. Refer to the table below for the standard versions of the product.

Model Tuning Range (nm) Output Power (mW) Sweep Speed (nm/s) Linewidth (nm)
765 – 815 nm Spectral Range
STBS-785-1 50 3 2 – 10,000 0.06
STBS-785-1-HP* 50 20 2 – 10,000 0.06
STBS-785-2 50 3 100 – 100,000 0.12
STBS-785-2-HP* 50 20 100 – 100,000 0.12
805 – 880 nm Spectral Range
STBS-840-1 75 3 2 – 10,000 0.06
STBS-840-1-HP* 75 20 2 – 10,000 0.06
STBS-840-2 75 3 100 – 100,000 0.12
STBS-840-2-HP* 75 20 100 – 100,000 0.12
900 – 980 nm Spectral Range
STBS-930-1 80 3 2 – 10,000 0.09
STBS-930-1-HP* 80 20 2 – 10,000 0.09
STBS-930-2 80 3 100 – 100,000 0.15
STBS-930-2-HP* 80 20 100 – 100,000 0.15
1020 – 1090 nm Spectral Range
STBS-1060-1 70 3 2 – 10,000 0.09
STBS-1060-1-HP* 70 20 2 – 10,000 0.09
STBS-1060-2 70 3 100 – 100,000 0.15
STBS-1060-2-HP* 70 20 100 – 100,000 0.15


General Specifications

Power Requirements: 110 VAC or 220 VAC, 50 Hz or 60 Hz
Power Consumption: 20 W / 25 W*
Operating Temperature: +15 °C to + 30 °C
Storage Temperature: 0 °C to +40 °C
Outline Dimensions (W × H × D): 257 × 170 × 325 mm / 362 × 160 × 326 mm*
Weight: 9 kg / 12 kg*


Product Customization Capabilities

We offer product customization services. A number of the operating characteristics of the product (e.g. the output power level, target wavelengths for the tuning range, the sweep speed limits, etc.) can be modified to meet your requirements. Please contact us for further discussion of your tunable laser requirements.