Tunable receiver

摘要

Embodiments for optical communication are provided in which tunable receiver selects and demodulates a first channel of a WDM signal. An example receiver includes a tunable local oscillator for generating a local oscillator signal approximately centered at a first channel wavelength. An optical hybrid of the receiver receives at a first input a wavelength-division-multiplexed (WDM) signal with a M-ary modulation scheme, wherein M is an integer greater than 2, and at a second input the local oscillator signal. A plurality of detectors detect in-phase and quadrature components of the first channel wavelength output of the optical hybrid, which are digitizing by a plurality of analog-to-digital converters. A digital signal processor processes the digitized in-phase and quadrature components in order to recover data carried by the first channel of the WDM signal.

主权项

1. A receiver comprising:
a tunable local oscillator configurable to select for demodulation any one of a plurality of wavelength-division-multiplexed (WDM) channels of a multi-channel optical signal by being tuned, based on a wavelength schedule that is based on input queue length information received from optical system nodes, to generate a local oscillator signal approximately centered at a WDM-channel wavelength corresponding to a WDM channel selected for demodulation, said WDM channel selected for demodulation being a WDM channel of said plurality of WDM channels; and an optical hybrid configurable to receive at a first input the local oscillator signal, and at a second input the multi-channel optical signal, the optical hybrid being configured to output in-phase and quadrature components of the WDM channel selected for demodulation; and wherein the receiver is configured to recover data carried by the WDM channel selected for demodulation based on the in-phase and quadrature components output by the optical hybrid.