Method for measuring transmission loss in optical...

Optical communications – Diagnostic testing – Determination of communication parameter

Reexamination Certificate

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C398S038000

Reexamination Certificate

active

07027730

ABSTRACT:
The invention provides a method for measuring transmission loss in an optical transmission line between a master station and a slave station, and also a slave station, a master station and a star network communication system using this method. Power of an optical signal is measured at a second end of an optical transmission line connected with an added slave station and at a first end other than the second end. The result at the first end is stored in a storing unit or transmitted to an incorporating unit by a transferring unit. The incorporating unit incorporates the result into a downstream optical signal, which is transmitted to the slave station. In the slave station an information extracting unit extracts the result from the downstream optical signal, and a processing unit calculates a difference between the measurement results of the first and second ends to obtain transmission loss therebetween.

REFERENCES:
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patent: 5771111 (1998-06-01), Domon et al.
patent: 5861966 (1999-01-01), Ortel
patent: 5974237 (1999-10-01), Shurmer et al.
patent: 6701086 (2004-03-01), Heiles
patent: 58-140624 (1983-08-01), None
patent: 8-304230 (1996-11-01), None
patent: 10-227722 (1998-08-01), None
“Computer Networks” by A. Tanenbaum, Prentice-Hall, 1981, pp. 115-116.

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