Patent ID: 9419711
Filing Date: 2016-08-16
CPC Classification: H04B

Claim Text:
1. A system for measuring in-band optical signal-to-noise ratio (OSNR) of signals having a signal electrical bandwidth (BS), the signals being carried in at least two polarization tributaries, the system comprising: a dual-polarization optical channel (DPOC) to carry the signals; a polarimeter comprising an input and an output, the polarimeter having a polarimeter bandwidth (BP), the BP partially overlapping with the BS, the polarimeter to measure a degree of polarization (DOP) of the signals; a sampler operatively coupled to the output of the polarimeter, the sampler to sample the DOP of the signals at a sampling rate and produce N digitized samples of the measured DOP, the sampling rate being at least 2BP; and a processor operatively coupled to the sampler, the processor comprising: