Communication node, wdm network, and network communication...

Details Communication node, wdm network, and network communication... Communication node, wdm network, and network communication...

H - Electricity

04

B

H04B 10/02 (2006.01) H04B 10/12 (2006.01) H04J 14/02 (2006.01)

Patent

CA 2296660

Communication nodes 510, 520, 530, 540, 550 are circularly connected by using two-way fibers 501-1 to 501-5 (hereafter, referred to simply as 501) and 502-1 to 502-5 (hereafter, referred to simply as 502). On the physical transmission network of (a), a working light wave path 560-N of a wavelength of .lambda.i is set through the communication node 550 between the communication node 510 and the communication node 540 as shown in (b). Between the communication node 510 and the communication node 540, a working light wave path 561-N is set through the communication nodes 520, 530. Between the communication node 520 and the communication node 530, a working light wave path 570-N of a wavelength of .lambda.j is set through the communication nodes 510, 550, 540. Between the communication node 520 and the communication node 530, a working light wave path 571-N of a wavelength of .lambda.j provided between them is set, and a total of four working light wave paths are set. All the working light wave paths 560-N, 561-N, 570-N, 571-N are set by using two-way fibers 501. To each of the working light wave paths 560-N, 561-N, 570-N, 571-N, standby light wave paths used as detours at the time of an obstacle are physically prepared both in the span direction (the same direction as the working light wave path) and in the ring direction (opposite direction of the working light wave path) on two-way fibers 502, but they are not set logically. The working light wave paths 560-N, 561-N and the standby light wave paths for them have the same wavelength of .lambda.i. The working light wave paths 570-N, 571-N and the 74 standby light wave paths for them have the same wavelength of .lambda.j.

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