Optical time domain reflectometer having shortened dead zone

Details Optical time domain reflectometer having shortened dead zone Optical time domain reflectometer having shortened dead zone

1993-12-28

1995-04-18

McGraw, Vincent P.

Optics: measuring and testing

For optical fiber or waveguide inspection

G01N 2188

Patent

active

054083109

ABSTRACT:
A driver circuit 2 generates a pulse current on the basis of an electrical pulse outputted from a timing generating portion 1. A light source 3 emits a light pulse according to the pulse current. The light pulse outputted from the light source 3 goes to a delay optical fiber 9 through an optical waveguide directional coupler 4, and then goes to a measuring optical fiber 10. A delay circuit 11 delays a digital operation of a digital operating portion 7, by a time required for said light pulse to go back and forth in the delay optical fiber 9.

REFERENCES:
patent: 4914394 (1990-04-01), Meyer
patent: 5008545 (1991-04-01), Anderson et al.
patent: 5062704 (1991-11-01), Bateman
patent: 5148230 (1992-09-01), Lane et al.

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