Patent ID: 8190034
Filing Date: 2012-05-29
Classification: H04B,H04J

Abstract:
1. An optical receiver, comprising: an avalanche photodiode that receives first signal light with a first wavelength in 1.49 μm band and generates a first photocurrent attributed to a multiplication factor of said avalanche photodiode, wherein said first signal light has a digital form; a PIN photodiode that receives second signal light with a second wavelength in 1.55 μm band and generates a second photocurrent, wherein said second signal light is an analog video signal; a control unit configured to estimate optical power input to said avalanche photodiode based on said second photocurrent; and a memory for storing said preset value in connection with said optical power, wherein said control unit reads out said preset value from said memory corresponding to said optical power based on said second photocurrent and controls said bias voltage such that said multiplication factor estimated from a ratio of said optical power to said second photocurrent becomes substantially equal to said preset value read out from said memory.