Patent ID: 9723370
Date: 2017-08-01
CPC Classifications: H04B,H04N

Claim:
1. A method for analyzing a spectrum of optical signals sent from a transmitter to a receiver, the method comprising: (a) applying at least one broadcast signal and at least one narrowcast signal to at least one input of the receiver; (b) applying a control voltage to a distortion cancellation circuit in the receiver; (c) toggling a multi-position switch operable to send to a spectrum analyzer: at least one selected at least one broadcast signal and/or at least one selected at least one narrowcast signal, and the output of the distortion cancellation circuit, wherein at least one of four wave mixing (4 WM), per-channel power level, or Stimulated Brillouin Scattering (SBS) is detectable via a spectrum analysis of the at least one selected signal and the output of the distortion cancellation circuit; (d) measuring distortion of the at least one selected signal at the control voltage; and (e) adjusting the control voltage of the distortion cancellation circuit until the distortion is minimized.