Apparatus for inserting light signals into, or receiving light s

Details Apparatus for inserting light signals into, or receiving light s Apparatus for inserting light signals into, or receiving light s

1995-07-06

1996-08-13

McGraw, Vincent P.

Optics: measuring and testing

For optical fiber or waveguide inspection

385 22, 385 36, G01N 2184, G02B 634, G02B 2608

Patent

active

055461808

ABSTRACT:
A method and apparatus is provided for injecting an optical test pulse mid-stream into an optical path to be tested by providing a switch that in normal transmitting and receiving of data includes two lenses separated by a gap. Data is usually transmitted across the gap from one lens to the other. In a test mode where OTDR is to be performed, a prism functioning in a similar manner to a periscope is moved into the gap between the lenses to couple/inject a test pulse into one of the lenses. An arrangement is described wherein either side of transmission line on either side of the gap can be tested.

REFERENCES:
patent: 4634239 (1987-01-01), Buhrer
patent: 4705349 (1987-11-01), Reedy
patent: 4720162 (1988-01-01), Mochizuki et al.
patent: 5453827 (1995-09-01), Lee

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