Termination device using a directional coupler which compensates

Details Termination device using a directional coupler which compensates Termination device using a directional coupler which compensates

1982-07-22

1985-03-05

Sikes, William L.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

350 9610, 350 9615, 350 9620, 455600, 455606, G02B 514

Patent

active

045027536

ABSTRACT:
A device for coupling a light source and an optical detector to one end of an optical fiber employed for two-way transmission of information. So as to reduce the effect of parasitic radiation coming from the light source and reaching the detector, a second light source is used which is arranged in such a way that it likewise excites the detector and is modulated by a compensation signal. The compensation signal is derived from the information signal modulating the first light source and its phase and amplitude are controlled so as to compensate for the modulation of the parasitic radiation. This increases the transmission range and makes it possible to use the same radiation wavelength for the two transmission directions.

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Stewart et al., "Directional Coupler . . . Optical Fibre", 2nd Eur. Coll. on Opt. Fibers, Paris, 9/76, pp. 267-268.

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