Low power optical transceiver using orthogonal polarization detection technique

摘要

A method and apparatus for simultaneous processing of signals impressed on a horizontal polarization of a light wave and on a vertical polarization of the light wave is provided. In one embodiment, a horizontal polarization pilot tone is impressed on a data signal carried by the horizontal polarization and a vertical polarization pilot tone is impressed on a data signal carried by the vertical polarization. A receiver processes the dual-polarized light wave and converts it to an X channel signal and a Y channel signal. The X and Y channel signals are processed in separate channels to recover a phase and frequency offset between them and a local oscillator. The phase and frequency recovered and frequency de-multiplexed signals are further processed to polarization de-multiplex the data signal carried by the horizontal polarization and the data signal carried by the vertical polarization.

主权项

1. A method of performing Orthogonal Polarization Detection, the method comprising:
receiving an optical transmission signal having a first signal associated with a horizontal light wave polarization and a second signal associated with a vertical light wave polarization, the first signal having a horizontal polarization pilot tone, and the second signal having a vertical polarization pilot tone, a spectrum of the first signal and a spectrum of the horizontal polarization pilot tone being offset in frequency from a spectrum of the second signal and a spectrum of the vertical polarization pilot tone; processing the received optical transmission signal by selecting the horizontal polarization pilot tone and selecting the vertical polarization pilot tone and recovering a phase and frequency recovered first signal associated with the horizontal light wave polarization and a phase and frequency recovered second signal associated with the vertical light wave polarization, wherein processing the received optical transmission signal comprises splitting the received optical transmission signal into a first channel signal and a second channel signal; and using a vertical polarization pilot tone and a horizontal polarization pilot tone from the first channel signal to produce a first horizontal phase and frequency recovered signal and a first vertical phase and frequency recovered signal and using a vertical polarization pilot tone and a horizontal polarization pilot tone from the second channel signal to produce a second horizontal phase and frequency recovered signal and a second vertical phase and frequency recovered signal.