Delay interferometer and demodulator

Details Delay interferometer and demodulator Delay interferometer and demodulator

2007-05-03

2010-12-07

Vanderpuye, Ken N (Department: 2613)

Optical communications

Receiver

Including postcompensation

C398S202000, C398S188000, C398S183000, C398S201000, C359S279000, C359S325000, C356S154000

Reexamination Certificate

active

07848662

ABSTRACT:
A delay interferometer and a demodulator including the delay interferometer and a balanced photodetector are provided. A half mirror splits an optical signal into first and second split beams of light which travel on first and second optical paths, respectively. A first reflector being disposed on the first optical path reflects the first split beam of light toward the half mirror. The second reflector being disposed on the second optical path reflects the second split beam of light toward the half mirror. At least one phase compensator being disposed between the half mirror and at least one of the first and second reflectors includes a medium that exhibits thermooptic effect and has temperature dependency of refractive index. The half mirror couples the first and second split beams of light to generate at least first and second coupled beams of light.

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UK Search and Examination Report dated Aug. 28, 2007.
Xiang Liu et al., “Athermal Optical Demodulator for OC-768 DPSK and RZ-DPSK Signals,” IEEE Photonics Technology Letters, vol. 17, No. 12, Dec. 2005.

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