Accession Number : ADD013842

Title :   Method and Apparatus for Overcoming Polarization-Induced Signal Fading in Optical-Fiber Coherent Communications.

Descriptive Note : Patent Application, Filed 31 May 88,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Kersey, Alan

Report Date : 31 May 1988

Pagination or Media Count : 15

Abstract : 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)

Descriptors :   *DEMODULATION, *HETERODYNING, *MIXING, *PATENT APPLICATIONS, BEAMS(STRUCTURAL), COHERENCE, COMPOSITE STRUCTURES, FREQUENCY, LIGHT, OPTICAL PROPERTIES, SIGNALS

Subject Categories : Command, Control and Communications Systems
      Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE