Method and apparatus for extracting optical clock signal

Details Method and apparatus for extracting optical clock signal Method and apparatus for extracting optical clock signal

2006-10-13

2009-08-18

Vanderpuye, Ken N (Department: 2613)

Optical communications

Receiver

Homodyne

C398S085000, C398S082000, C398S087000, C398S095000, C398S155000, C398S154000, C398S202000

Reexamination Certificate

active

07577370

ABSTRACT:
An apparatus and method for extracting an optical clock signal are provided. The apparatus includes a first reflection filter selecting and reflecting only a first frequency component in an input optical signal; a first Fabry-Perot laser diode matching the first frequency component reflected by the first reflection filter with a predetermined output mode and outputting the first frequency component in the predetermined output mode; a second Fabry-Perot laser diode selecting a second frequency component in an input optical signal that has not been reflected but has been transmitted by the first reflection filter, matching the second frequency component with a predetermined output mode, and outputting the second frequency component in the predetermined output mode; and a photodetector receiving the first frequency component from the first Fabry-Perot laser diode and the second frequency component from the second Fabry-Perot laser diode and beating them to extract a clock signal. Accordingly, the optical clock signal can be extracted with low influence of the pattern of the input optical signal and an improved signal-to-noise ratio (SNR).

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