Optical: systems and elements – Optical demodulator
Patent
1998-07-30
2000-11-28
Lee, John D.
Optical: systems and elements
Optical demodulator
G02F 200
Patent
active
06154308&
ABSTRACT:
Optical signals input to a sensor array that includes a plurality of pathlength mismatched interferometers are phase modulated. Two different phase steps are generated in sequence within a time interval T in signals output from the interferometer array. Signals output from the array are processed to produce a first output signal S.sub.1 that is a function of the phase shift .phi. and a first one of the phase steps in a first portion of the time interval T and a second output signal S.sub.2 that is a function of the phase shift .phi. and the other one of the phase steps in a second portion of the time interval T. The signals S.sub.1 and S.sub.2, are processed to calculate the phase shift .phi. in optical signals that have propagated through the sensor array as functions of the sum and differences of the signals S.sub.1 and S.sub.2.
REFERENCES:
patent: 4957362 (1990-09-01), Peterson
patent: 5633748 (1997-05-01), Perez et al.
patent: 5719673 (1998-02-01), Dorsel et al.
patent: 5883548 (1999-03-01), Assard et al.
Lee John D.
Litton Systems Inc.
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