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Keywords: DFB, laser diode, LD, DL, wavelength tunable laser
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
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 |
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 |
| STG-EM650 | 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 |
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 EM327 | 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 EM337 | 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.
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.
Features:
Stable wavelength and output power;
Narrow linewidth;
No jump mode output in operating current range
Applications:
Optical fiber gas detection system;
Optical sensing;
Fiber communications
| 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 |
| 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 |
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.
Features:
Good beam quality;
Compact design;
High stability;
Long life time;
Easy operation
Applications:
Spectroscopy;
Medicine; Photochemistry;
Biology;
Integrated optics
| 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 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 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 |
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. 
Applications
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.
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.
Applications
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.
| 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.
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.
The device has an RS-232 DTE port for remote control from a computer. The necessary connectivity software is supplied with the instrument.
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.
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 |
* INCLUDES INTERNAL OPTICAL POWER BOOSTER
| 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* |
* FOR MODELS WITH INTERNAL OPTICAL POWER BOOSTER
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.