Method for providing a bidirectional optical supervisory...

Details Method for providing a bidirectional optical supervisory... Method for providing a bidirectional optical supervisory...

H - Electricity

04

B

H04B 10/24 (2006.01) H04B 10/08 (2006.01) H04B 10/17 (2006.01) H04J 14/02 (2006.01)

Patent

CA 2282607

Optical supervisory channels are provided in an optical fiber network by receiving, in a first network element (10), a first optical supervisory channel signal (12) at a first wavelength (.lambda.1) from a first direction (14) on a first optical fiber (16), and by transmitting, from the first network element (10), a second optical supervisory channel signal (18) at a second wavelength (.lambda.2) in a second direction (20) and also on the first optical fiber (16). An amplified optical wavelength division multiplexed transmission system utilizing these supervisory signals divides a revenue-traffic amplifying region of an optical amplifier, with a lower portion being used for transmission in the first direction and an upper portion being used for transmission in the second direction. Both the first and second wavelengths are located outside of a flat-gain amplifying region of the optical amplifier.

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