Method and Apparatus for Overcoming Polarization-Induced Signal Fading in Optical-Fiber Coherent Communications.
Patent Application, Filed 31 May 88,
DEPARTMENT OF THE NAVY WASHINGTON DC
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A method and apparatus is disclosed for overcoming the polarization-induced signal fading problem in coherent heterodyne systems by mixing the incoming signal light with orthogonal local oscillator polarization modes which have been separated in the optical frequency domain to produce a composite beam, photodetecting the heterodyne mixing between this composite beam and the received signal light to produce first and second intermediate frequency signals, separately filtering and demodulating each of the first and second intermediate frequency signals to provide first and second demodulated signals, and combining the first and second demodulated signals to produce a non-fading output signal. Patent application. rrh
- Command, Control and Communications Systems