Advantage of APD (Avalanche Photo Diode)
Time: 2014-05-28 Published by: Fiberall China
APD is an optical detection element. Add reverse bias to P-N junction of Photo-Diode (made by silicon or germanium), the incident light is absorbed and formed to be photocurrent. When reverse bias is increasing it will arise "avalanche" (light current surge exponentially), therefore this diode is called "avalanche photodiode".
Some types of Fiberall optical transceiver adopt APD, its advantage is:
1, improve the sensitivity of the photodiode (with internal gain of 102 ~ 104).
2, the response speed becomes faster, frequency bandwidth can reach 100GHz, and it is the fastest photodiode.