Optical analyzer with variable attenuators at inputs and outputs

Details Optical analyzer with variable attenuators at inputs and outputs Optical analyzer with variable attenuators at inputs and outputs

1999-02-03

2000-11-28

Palmer, Phan T. H.

Optical waveguides

With optical coupler

Switch

385 17, 385 24, 385140, G02B 626

Patent

active

061545848

ABSTRACT:
An apparatus for controlling attenuation of optical signals routed through a matrix switch capable of optically coupling a selected transmission station of a plurality of transmission stations to a first port and optically coupling a second port to a reception station includes a first variable attenuator that is optically coupled to the first port so that an optical path length exists between the first variable attenuator and the transmission station. The apparatus includes an optical analyzer that has an input port and an output port. The input port is optically coupled to the variable attenuator and the output port is optically coupled to the second port. Thus, the input port is coupled to the first port through the first variable attenuator. A control unit controls the first variable attenuator so as to cause an optical signal passing therethrough to be attenuated by a predetermined amount based on the optical path length between the transmission station and the first variable attenuator so that the optical signal entering the input port has a signal strength within a predetermined range.

REFERENCES:
patent: 4799789 (1989-01-01), Tsukamoto et al.
patent: 4893006 (1990-01-01), Wakai et al.
patent: 4960989 (1990-10-01), Liebenrood et al.
patent: 5353147 (1994-10-01), Gimes
patent: 5589933 (1996-12-01), Osgood et al.
patent: 5619321 (1997-04-01), Artiglia et al.
patent: 5995259 (1999-11-01), Meli et al.

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