Analogue maintenance detection

Details Analogue maintenance detection Analogue maintenance detection

2007-02-27

2007-02-27

Singh, Dalzid (Department: 2613)

Optical communications

Receiver

Including postcompensation

C398S210000, C398S033000

Reexamination Certificate

active

10254109

ABSTRACT:
Methods and apparatus are described for processing an optical signal. The optical signal comprises at least a first channel signal at a first wavelength modulated by a first frequency, a second channel signal at a second wavelength modulated by a second frequency, and a third channel signal at a third wavelength modulated by a third frequency. The method includes receiving the optical signal, and splitting the received optical signal into at least two optical bands, a first optical band comprising the first and second channel signals, and a second optical band comprising the third channel signal. A first electrical signal is formed, proportional to the total optical power of the first optical band.

REFERENCES:
patent: 6160649 (2000-12-01), Horiuchi et al.
patent: 6212310 (2001-04-01), Waarts et al.
patent: 6281995 (2001-08-01), Spickerman et al.

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