G - Physics – 02 – B
Patent
G - Physics
02
B
26/197, 349/56,
G02B 6/10 (2006.01) B44C 1/22 (2006.01) G01J 3/02 (2006.01)
Patent
CA 1205899
ABSTRACT A fiber optic energy sensor and optical demodulation system is disclosed wherein the signal energy to be sensed or detected causes an etched single mode fiber to be stretched or compressed which causes the optical path length for electromagnetic radiation traveling in the core of the optic fiber to change. The change in optic path length modulates the electromagnetic radiation traveling in the fiber. The optical demodulation system locates each energy sensor between the members of a pair of length limited Bragg reflectors formed inside of the optical fiber. Each pair of reflectors as arranged, forms a Fabry-Perot type interferometer which only contains resonances for those portions of the electromagnetic spectrum in which the Bragg reflectors operate. Since each energy sensor is located between the reflectors of a pair, then as signal energy is detected the sensor's resulting optical path length change causes the resonances of the Fabry-Perot interferometer, to shift spectrally. The system then partially demodulates this spectral shift using a second Fabry-Perot interferometer, called the analyzer interferometer, whose resonances have a spectral separation relative to that of the interferometer containing the energy sensor so as to cause amplification of the spectral shift. The output of the combination of the energy sensor interferometer and the analyzer interferometer shifts spectrally more than the original spectral shift by an amplification factor given by equations presented in the detailed des- cription of the invention. The system also allows the use of more than one analyzer interferometer, each causing different amplification. The resulting amplifications can be arranged to provide outputs each of which corresponds to a separate digit of the number expressing the original spec- tral shift thus reducing the bandwidth of the electronic detectors and time demodulator.
464702
Culver William H.
Gould Gordon
Schmadel Donald C.
Chevron Research And Technology Company
Smart & Biggar
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