Differential phase modulation in an optical fibre...

Details Differential phase modulation in an optical fibre... Differential phase modulation in an optical fibre...

H - Electricity

04

B

325/1

H04B 9/00 (1985.01)

Patent

CA 1263445

ABSTRACT An optical fibre communication system in which modulator means is provided at the transmitter end of the system for modulating the relative phase between orthogonally polarised signals derived from a coherent light source in accordance with data or information to be transmitted over an optical fibre communication path to the receiver end of the system where the signals will be demodulated. In order to reduce noise resulting from delay differentials between polarised signals transmitted over the optical fibre path it is preferred to arrange that the communication path includes sections of polarisation maintaining optical fibre which are angularly rotated through 90 or thereabouts relatively to one another so that the overall delay for the respective polarised signals over the entire length of the communication path is substantially the same.

536944

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