Reliance Comm/tec Corporation

George Bu-Abbud

An echo cancelling circuit for use with a laser whose generated light is connected to an optical fiber by a connector. The connector reflects part of the laser light to a detector associated with the laser. The echo cancelling circuit attenuates the laser generated light by a predetermined factor. The cancelling circuit then detects the attenuated laser light and develops a signal whose amplitude and phase is such as to substantially cancel the signal representative of the light reflected from the connector.

Echo cancelling circuit for use with laser

A closed loop control system for a laser which is used in an instrument which may be an optical time domain reflectometer. The system uses the output light of the laser and the light from a fiber to which the laser light is connected to initially set the bias and pulse current amplitudes to the laser and adjust the gain of the receiver which is part of the control system. The control system also responds to light from the fiber to continuously control the pulse current amplitude and receiver gain so that the amplitude of the electrical signal representative of that light is kept within the operating range of the receiver electronics.

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Plano, TX, United States of America

George Bu-Abbud