Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Patent
1988-11-14
1991-10-22
Crosland, Donnie L.
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
34087028, 34087018, 359115, 359154, 359190, 359191, H04J 1400, G02F 100
Patent
active
050602250
ABSTRACT:
A phase modulated optical carrier signal is coupled through at least one optical fiber 20 to a signal processor 13, the optical carrier signal being phase modulated within an electro-optic device by signals generated by a focal plane array of radiation detectors 12. Disclosed are a redundant optical link operating in the time domain, an optical link which employes wavelength division multiplexing in the time domain and an optical link which employes wavelength division multiplexing in the frequency domain. A phase modulator 70 is readily adaptable to at least two signal processing methodologies inlcuding a phase locked loop homodyne detection scheme and a synthetic heterodyne detection scheme, both detection schemes operating at quadrature. The phase modulator is a Mach Zehnder type interferometer operated in a push-pull configuration to achieve a two-fold increase in phase modulation.
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Crosland Donnie L.
Denson-Low Wanda K.
Hughes Aircraft Company
Streeter William J.
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