Patent ID: 7697580
Filing Date: 2010-04-13
Classification: B82Y,G01R,G02B,G02F,H01L,H01S,H04B,H04J

Abstract:
1. A monitoring method, comprising the steps of: superimposing a frequency tone on a bias current to generate a modulation current; modulating a laser in accordance with the modulation current to generate a first optical signal output from a first facet of the laser and a second optical signal output from a second facet of the laser; detecting a first output power associated with the first optical signal with a first photodiode; providing a first detection signal based on the first output power; determining a first optical attribute based on the first detected signal; transmitting the second optical signal through a second photodiode; detecting a second output power associated with the second optical signal with the second photodiode; providing a second detection signal based on the second output power; determining a second optical attribute based on the second detection signal; and determining an average output power associated with the second optical signal based on the first and second attributes, wherein said first optical attribute is an optical modulation index (OMI) of the frequency tone and the second optical attribute is a modulation depth.