Echo cancelling circuit for use with laser

Details Echo cancelling circuit for use with laser Echo cancelling circuit for use with laser

1989-09-25

1991-06-11

Davie, James W.

Optics: measuring and testing

For optical fiber or waveguide inspection

372 33, G01N 2188

Patent

active

050227521

ABSTRACT:
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.

REFERENCES:
patent: 4243320 (1981-01-01), Gordon
patent: 4355395 (1982-10-01), Salter et al.
patent: 4838689 (1989-06-01), Neumann
patent: 4893006 (1990-01-01), Wakai et al.
patent: 4912717 (1990-03-01), Takeuchi

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