Method for optical communication of information

Details Method for optical communication of information Method for optical communication of information

H - Electricity

04

B

325/1

H04B 10/00 (2006.01) H04B 10/142 (2006.01)

Patent

CA 1282832

Summary The invention describes a method for optical communi- cation of information between transmitter and receiver spatially separated from each other. The principle of heterodyne reception is utilized. A non-modulated op- tical carrier of a laser arranged on the receiving side is subdivided in a first fibre-optical coupler (KE) into two portions, the transmission path (EMF) and the local laser wave (LL). In one branch, a disp]acement of fre- quency by the amount .DELTA.f takes place. The non-modulated optical carrier passes through a one-mode fibre (EMF) in direction transmitting side and is modulated there with an effective signal in a modulator (MOD) (Fig. 1). This now modulated optical signal travels back to the re- ceiving side, where it is converted with the local laser wave (LL) into an intermediate frequency band.

563534

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