Multiple-FSR DPSK demodulator

Details Multiple-FSR DPSK demodulator Multiple-FSR DPSK demodulator

2011-08-23

2011-08-23

Petkovsek, Daniel (Department: 2874)

Optical: systems and elements

Optical demodulator

C359S578000, C359S629000, C359S633000, C356S477000, C398S201000

Reexamination Certificate

active

08004750

ABSTRACT:
A switchable free-spectral-range mode selector is used to change the free spectral range of a free-space delay-line interferometer. The mode selector consists of a rotatable device with at least one transparent plate selected to produce the desired change in the free spectral range of the delay-line interferometer. The device may be rotated in and out of the free-space optical path of on of the interferometer arms. If used as a DPSK demodulator, the device enables operation at multiple predetermined free spectral ranges. In the preferred embodiment, the demodulator includes a 50/50 beam-splitter cube combined with two cavities. The mode selector consists of a plurality of different transparent slabs attached to a rotatable shaft so that any one of the slabs or none may be inserted in the appropriate optical path to obtain the desired FSR mode of operation.

REFERENCES:
patent: 3517982 (1970-06-01), Fonda-Bonardi Giusto
patent: 4773732 (1988-09-01), Schafer
patent: 7522343 (2009-04-01), Hsieh
patent: 7526210 (2009-04-01), Liu
patent: 7668466 (2010-02-01), Tian et al.
patent: 7706069 (2010-04-01), Mehl et al.
patent: 7738115 (2010-06-01), Ocelic et al.

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