Pseudo common-path DPSK demodulator

Details Pseudo common-path DPSK demodulator Pseudo common-path DPSK demodulator

2011-08-23

2011-08-23

Petkovsek, Daniel (Department: 2874)

Optical: systems and elements

Optical demodulator

C359S583000, C359S584000, C356S477000, C398S201000

Reexamination Certificate

active

08004749

ABSTRACT:
A rhomb beam splitter, rather than a conventional cube, is used in combination with a mirror reflecting both the reflected and transmitted beams to obtain a delay-line interferometer demodulator with a substantially common path. This significantly reduces the sensitivity of the device to environmental changes and also greatly simplifies the manufacture process. A polarization-insensitive coating or a wave plate, a thermal phase tuner with a micro-heater, and two compensator plates are used in the paths of the beams to balance the optical path lengths and to compensate for polarization and environmental effects.

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