Network hub employing 1:N optical protection

Details Network hub employing 1:N optical protection Network hub employing 1:N optical protection

2006-07-04

2006-07-04

Sedighian, M. R. (Department: 2633)

Optical communications

Multiplex

Optical local area network

C398S079000, C398S083000, C398S003000, C398S007000

Reexamination Certificate

active

07072584

ABSTRACT:
A 1:N protection scheme that provides both equipment and line protection against a single point of failure for a network hub situated in an optical ring network. The invention is suitable for use in DWDM based optical ring networks, and in particular, in networks constructed having a logical star over physical ring topology. The hub is modified to comprise N+1 transceivers, assuming an N channel DWDM network wherein each of the N transmitters operates using a different wavelength. Protection against line failures is achieved by optically splitting the transmit signal into two paths and transmitting each separately in opposite directions over the ring (i.e. 1+1 protection). In the event of a line failure, the other signal should still arrive at the destination. Protection against equipment failures is achieved through the use of a spare transceiver having a tunable wavelength of operation (i.e. 1:N protection).

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