CLOCK RECOVERY METHOD AND CLOCK RECOVERY ARRANGEMENT FOR COHERENT POLARIZATION MULTIPLEX RECEIVERS

摘要

Component signal values are derived from component signals and fed to at least one fixed equalizer which generates equalizer output signals. The signals are fed to phase error detectors generating phase error signals. The phase error signals are combined with further phase error signals derived by further error detectors receiving signal values from further equalizers and/or the component signal values directly from sample units.

主权项

1. Clock recovery method for coherent polarization multiplex receivers,
comprising the steps of
coherent demodulating a received polarization multiplex signal and deriving orthogonal signal components,sampling and converting the orthogonal signal components into digital component values,feeding said component values to an equalizer,deriving phase error values from output values of said equalizer and from the component values,calculating two resulting phase error values, wherein each resulting phase error value (XPE, YPE) is calculated from
at least one phase error value derived from output values of said equalizer andat least one phase error value derived from the component values,deriving an oscillator control signal from each of said two resulting phase error values, andcontrolling two controllable oscillators each generating a sample signal for sampling a corresponding one of said orthogonal signal components or re-sampling the component values based on said oscillator control signals.