Patent ID: 7315575
Filing Date: 2008-01-01
Classification: H04B

Abstract:
1. A method for equalizing channel distortions in a dual-polarization optical transport system, wherein a received signal is comprised of a complex signal of a first transmitted polarization component and a complex signal of a second transmitted polarization component, the method comprising; a blind self-recovery mode comprising a blind adaptation process for recovering the complex signal of the first transmitted polarization component, identifying boundaries of data frames of the complex signal of the first transmitted polarization component and recovering training information contained in the data frames once the boundaries are identified; a training mode comprising generating from the recovered training information an estimate of inverse channel characteristics for the complex signals of the first and second transmitted polarization components and using the estimate to compensate for inter-symbol interference (ISI) and non-ideal channel characteristics; and a data directed mode for maintaining the estimate of the inverse channel characteristics for the complex signals of the first and second transmitted polarization components and to ensure continuing compensation of the ISI and the non-ideal channel characteristics in view of a time-varying nature of channel characteristics.