InGaAs avalanche photodiodes are used in situations where more sensitivity is needed than is achievable with standard photodiodes. These devices use an internal gain mechanism to generate secondary electrons via impact ionization. This in turn sets off an electron avalanche which amplifies the initial signal for easier measurement.
APDs are often used in applications having very low signal levels, such as LiDAR or optical communication.
Photodiode | Key Features | Applications |
InGaAs APDs | · Chip active diameters from 80μm to 350μm · Spectral response from 900nm to 1650nm · Linear operation · Low dark current for high sensitivity · Low capacitance for high speed · Fiber pigtail available (single-mode or multi-mode) · Package flexibility (TO packages and ceramic submounts, with ball lens option) | · LiDAR · Free space optics · High-sensitivity photometry · Optical time domain reflectometer (OTDR) · Optical communication |
If you require something outside of the standard options, we are happy to discuss custom designs tailored to your unique specifications.
Feature | Description |
Mounting Configurations | TO PACKAGES: A wide variety of TO packages are available. Selection is based on the size of the photodiode and the pinout requirements of your application. CHIP ON CERAMIC SUBMOUNT: GPD offers a variety of standard ceramics and can also design a ceramic unique to your application. Chips can be bonded with epoxy or eutectic solder. |
Fiber Coupling | Many applications require high-speed photodiodes or APDs to be coupled into single-mode or multi-mode optical fibers. GPD is able to work with a variety of fibers and can add most standard connectors to provide a high-quality, reliable device. |
Windows and Lenses | Many of the GPD photodiode packages come standard with a glass or sapphire window. Additionally, GPD can provide custom windows best suited for your application. Lenses can be added to many TO packages if a larger field of view is required for increased detection. In some cases, lenses can also be added directly to the photodiode or APD chip. |
Filters and Coatings
| When the light incident on your detector needs to be manipulated, the best course of action may be to apply a coating or filter specific to your application. For maximum signal, AR coatings can be applied to one or both sides of windows, and also to the photodiode chip itself. Band-pass or long-pass filters can be applied to windows to tailor the working wavelength range of the detector system. In high-power scenarios, partially reflective coatings can attenuate optical power to a manageable level. Where reflections are undesirable, absorptive filters can often be used for attenuation in place of a traditional glass window. |
Thermoelectric Cooling
| In noise-sensitive applications, many customers cool their photodiodes to reduce thermal noise and get the best performance. GPD Optoelectronics offers single- and dual-stage thermoelectric coolers built into TO packages with the photodiodes. |
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