Optical receiver and optical receiving method corresponding...

Details Optical receiver and optical receiving method corresponding... Optical receiver and optical receiving method corresponding...

2006-04-05

2009-10-20

Vanderpuye, Ken N (Department: 2613)

Optical communications

Receiver

Including optical waveguide

C398S202000, C398S208000, C398S212000, C359S325000, C359S577000, C359S583000

Reexamination Certificate

active

07606504

ABSTRACT:
An optical receiver comprises branching units for branching and supplying the signal lights to be inputted to the first to fourth optical waveguides provided on a substrate, second to third optical waveguides for giving delay time differences corresponding to a symbol of the DMPSK modulated signal, a demodulating unit for demodulating two light signals through interference of signal lights between the first to second optical waveguides and between the third to fourth optical waveguides, two optical detectors for converting two light signals from the demodulating unit, and a light path length varying unit for identically varying each light path length of two optical waveguides being arranged through selection of combinations of the first and third optical waveguides, the first and fourth optical waveguides, and the second and third optical waveguides in one region when the wavelength of the signal light is varied.

REFERENCES:
patent: 2005/0286911 (2005-12-01), Doerr et al.
patent: 2006/0056845 (2006-03-01), Parsons et al.
patent: 2285144 (2003-08-01), None
patent: WO 03/063515 (2003-07-01), None
Kim et al., “Robustness to Laser Frequency Offset in Direct-Detection DPSK and DQPSK Systems”, Sep. 2003, Journal of Lightwave Tech., vol. 21, No. 9, pp. 1887-1891.
“High Sensitivity Optically Preamplified Direct Detection DPSK Receiver with Active Delay-Line Stabilization,” IEEE Photonics Technology Letters, vol. 6, No. 2; Feb. 1994; p. 1-3.
British Search Report; dated Jul. 26, 2006.

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