Fiber optic energy sensor and optical demodulation system and methods of making same
AssigneeOptelecom, Inc.
InventorsDonald Schmadel, William H. Culver, Gordon Gould
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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. There is also disclosed novel methods of manufacturing the novel type of fiber optic energy sensor and optical demodulation system.
Claims14
The method of spectrally amplifying the spectral shift of the transmission peaks of a Fabry-Perot interferometer comprising:
- projecting or guiding wavelength scanned electro-magnetic radiation into the said Fabry-Perot interferometer;
- projecting the spectrally shifted transmitted output peaks of the Fabry-Perot interferometer into an analyzer Fabry-Perot interferometer;
- and
- constructing the cavity length of said Fabry-Perot interferometer and said analyzer Fabry-Perot interferometer in accordance with the following equations:
- ##EQU16##
- .DELTA..lambda..sub.SA .apprxeq.U.DELTA..lambda..sub.SR EQ XI ##EQU17## for S.sub.A =(f)(S.sub.R).+-.1
- and
- S.sub.A and S.sub.R >2 and f is a positive integer.
The invention defined in claim 9 further comprising a wavelength scanning laser to produce the wavelength scanned electro-magnetic radiation.
A means for amplifying the spectral shift of the transmission peaks of Fabry-Perot interferometer comprising:
- a beam of wavelength scanned electromagnetic radiation directed into the Fabry-Perot interferometer having spectrally shifted transmission peaks;
- an analyzer Fabry-Perot interferometer, placed so the resulting transmitted output of the said Fabry-Perot interferometer is directed to said analyzer Fabry-Perot interferometer constructed to have a cavity length related to the cavity length of said Fabry-Perot interferometer in accordance with the following equations:
- ##EQU18##
- .DELTA..lambda..sub.SA .apprxeq.U.DELTA..lambda..sub.SR EQ XI ##EQU19## for S.sub.A =(f)(S.sub.R).+-.1
- and
- S.sub.A and S.sub.R >2 and f is a positive integer.
Dependencies are inferred from the claim text.