H - Electricity – 04 – B
Patent
H - Electricity
04
B
H04B 10/08 (2006.01) H04J 14/02 (2006.01)
Patent
CA 2375706
A WDM optical network comprising a plurality of nodes has a first apparatus for optical analysis at the site of a first optical amplifier upstream of the first node, a second apparatus for optical analysis at the site of a second optical amplifier at the downstream output of the first soda, and a third apparatus for optical analysis at the sift of a third optical amplifier further downstream of the first node, where knowledge of the optical signal to noise ratio (OSNR) is desired. The first, second and third apparatus are for measuring the signal level at frequencies both at and in-between the channel frequencies. The signal levels at the channel frequencies and between the channel frequencies at the first, second and third apparatus are used to derive the OSNR at the third apparatus. This enables the OSNR to be measured accurately at any site in the networks, using calculations in which noise shaping of the nodes can be factored in to the calculation of OSNR.
Anslow Peter J.
Heath Richard W.
Nortel Networks Limited
Smart & Biggar
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