Method and device for compensating, in a coherent optical commun

Details Method and device for compensating, in a coherent optical commun Method and device for compensating, in a coherent optical commun

1988-12-23

1990-04-17

Griffin, Robert L.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

455618, H04B 900

Patent

active

049187473

ABSTRACT:
The invention relates to a method for compensating, in a coherent optical communication system with heterodyne detection, at the receiving side phase noise of the transmitting and of the local laser. Characteristic of the present method is that the phase-noise compensation takes place in the LF domain. The two MF heterodyne signals (Imf and Pmf) are first demodulated into LF signals (in which there is still noise), which are subsequently subtracted from one another, due to which the respective noise components cancel out each other. Preferably a local laser signal which is, qua frequency, between the two other HF signals is chosen. This offers the advantage that the two MF heterodyne signals can be modulated by one and the same demodulator; because for the compensation of phase noise the demodulated MF signals (Iif respectively Pif) which are, qua phase noise, in opposite phase with regard to each other are then added to one another.
The advantage of the method according to the invention is that the bandwidth for which the receiver has to be suitable is relatively small.

REFERENCES:
patent: 4783852 (1988-11-01), Auracher
Hodgkinson, "Demodulation of Optical DPSK using in-plase and Quadrative Detection", Electronic Letters, 9-12-85, Vol. 21 #18.

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