System for measuring delay time variation in optical fiber digit

Details System for measuring delay time variation in optical fiber digit System for measuring delay time variation in optical fiber digit

1986-01-21

1988-08-16

Griffin, Robert L.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

455612, 370 15, H04B 900, H04J 116

Patent

active

047649801

ABSTRACT:
Delay time variation in an optical fiber digital communication system which includes optical regenerative repeaters is measured at one of terminal ends having reference clock signal. A monitor signal which depends upon the delay time variation is provided at the farthest repeater in an area where delay time is subject to secular change by dividing reference clock signal from said terminal end, and said monitor signal is returned to the terminal end from said farthest repeater, and the terminal end compares the returned monitor signal with the divided reference signal by using a phase comparator to provide measure of delay time variation.

REFERENCES:
patent: 4247934 (1981-01-01), Parras
patent: 4271513 (1981-06-01), Maejima et al.
patent: 4271514 (1981-06-01), Parras et al.
Sakaguchi et al., Journal of Electronics and Communication in Japan; "A Study on Branching Systems in Optical Fiber Submarine Cable Systems"; CS84-123; 1984; pp. 94-101.

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