Patent ID: 7509056
Filing Date: 2009-03-24
Classification: H04B

Abstract:
1. A method for processing optical signals to be transmitted through an optical transmission line, the method comprising: inserting a data signal over transmitted optical light using first at least one optical modulator in each of at least two optical paths of the optical transmission line; generating at least two optical pulse streams differing in their polarization states and having a carrier suppressed return to zero format by modulating the optical light on said at least two optical paths, over which the data signal is inserted, using second at least one optical modulator which is driven using a combination of two sinusoidal electrical voltage signals comprising a first voltage signal having a frequency f and a second voltage signal having a frequency 3f that is a third harmonic of the frequency f; interleaving the at least two optical pulse streams; and generating a final optical pulse stream from the interleaving.