Patent ID: 9037005
Filing Date: 2015-05-19
Classification: H04B

Abstract:
1. A method of monitoring a plurality of optical channels, the method comprising: receiving, at a tunable filter coupled to a deinterleaver, an optical signal having a plurality of optical channels at a nominal channel spacing, the tunable filter having a −20 decibel bandwidth that is between about two and four times an input channel spacing F transmitting through the tunable filter a first passband signal derived from the optical signal and centered about a particular center frequency corresponding to a particular optical channel, the first passband signal primarily including contributions from the particular optical channel and: one or more first optical channels offset from the particular optical channel by a first frequency offset substantially equal to the input channel spacing F receiving the first passband signal at an input of the deinterleaver, the deinterleaver further including an odd output and an even output; and transmitting through the deinterleaver a second passband signal derived from the first passband signal, the second passband signal being centered about the particular center frequency, wherein an attenuation of the one or more first optical channels in the second passband signal by the tunable filter and deinterleaver is at least a first predetermined amount and an attenuation of the one or more second optical channels in the second passband signal by the tunable filter and deinterleaver is at least a second predetermined amount.