DQPSK optical receiver circuit

Details DQPSK optical receiver circuit DQPSK optical receiver circuit

2005-11-14

2008-10-28

Singh, Dalzid (Department: 2613)

Optical communications

Receiver

C398S203000, C398S154000, C398S161000

Reexamination Certificate

active

07444085

ABSTRACT:
A DQPSK optical signal is split by the splitter1into Data1and Data2systems. For each system, a phase-modulated optical signal is converted into an intensity modulated electric signal, and clock reproduction and data reproduction are independently carried out for each system. While a phase difference occurs between the data of each system, a clock signal having an intermediate phase of the reproduced clock of each system is generated to latch data of both systems by using the clock signal. This results in the data of both systems having the same phase.

REFERENCES:
patent: 5012494 (1991-04-01), Lai et al.
patent: 2004/0081470 (2004-04-01), Griffin
patent: 2006/0056845 (2006-03-01), Parsons et al.
patent: 8-237228 (1996-09-01), None
patent: A-H11-225050 (1999-08-01), None
patent: A-2002-141785 (2002-05-01), None
patent: 2004-516743 (2004-03-01), None
patent: WO 02/51041 (2002-06-01), None

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