Optical transmitting apparatus and optical communication system

Details Optical transmitting apparatus and optical communication system Optical transmitting apparatus and optical communication system

2005-12-12

2010-12-07

Vanderpuye, Ken N (Department: 2613)

Optical communications

Transmitter

Having particular modulation

C398S187000, C398S186000, C398S185000, C398S183000

Reexamination Certificate

active

07848659

ABSTRACT:
A data modulator unit generates a DQPSK optical signal in accordance with a data signal. A phase shift unit provides a phase difference of π/2 between a pair of arms. A photodetector converts an output signal of the data modulator unit into an electrical signal. A filter is a low-pass filter with a cut-off frequency lower than a symbol frequency, and filters an output signal of the photodetector. A monitor unit detects power of an output signal of the filter. A phase difference control unit adjusts the amount of phase shift in the phase shift unit so as to minimize power of an output signal of the filter.

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