Demodulators For Optical Fiber Interferometers With [3 x3] Outputs
KeoIian, Robert M.
Garrett, Steven L.
Cameron, Charles B.
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A highly sensitive optical fiber interferometer sensor comprising a laser light source, a [2 X 2] optical fiber coupler to split the beam in two, a differential transducer which converts a signal of interest into optical phase shift in the laser light transmitted through the two optical fibers in the interferometer and a [3 X 3] optical fiber complex which recombines the two beams, producing interference which can be electronically detected. The use of the [3 X 3] coupler permits Passive Homodyne demodulation of the phase-modulated signals provided by the interferometer without feedback control or modulation of the laser itself and without requiring the use of electronics within the interferometer
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Cameron, Charles B. (Monterey, California. Naval Postgraduate School, 1991-06); NPS-ES-91-005This dissertation examines three methods of recovering signals cheaply from one class of highly sensitive Optical Fiber Interferometric Sensors (OFIS). This class of sensors consists of a laser light source; a 2X2 optical ...
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