Frequency agile transmitter and receiver architecture for DWDM systems
AssigneeNortel Networks Limited
InventorsJohn D. McNicol, Kuang Tsan T. Wu, Adrien A. Comeau
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Abstract
A frequency-agile optical transceiver includes a shared local oscillator (LO), a coherent optical receiver and an optical transmitter. The LO operates to generate a respective LO optical signal having a predetermined LO wavelength. The coherent optical receiver is operatively coupled to the LO, and uses the LO signal to selectively receive traffic of an arbitrary target channel of an inbound broadband optical signal. The optical transmitter is also operatively coupled to the LO, and uses the LO to generate an outbound optical channel signal having a respective outbound channel wavelength corresponding to the LO wavelength.
Claims17
A frequency-agile optical transceiver comprising:
- a local oscillator (LO) for generating a respective LO optical signal having a predetermined LO wavelength;
- a coherent optical receiver operatively coupled to the LO, for generating an Intermediate Frequency (IF) signal containing traffic of a target channel of an inbound broadband optical signal, based on the LO optical signal;
- a controllable IF filter for selectively isolating signal components of the target channel within the IF signal;
- and
- an optical transmitter operatively coupled to the LO for generating an outbound optical channel signal having a respective outbound channel wavelength corresponding to the LO wavelength;
- wherein the LO is responsive to a tuning signal received from a second transceiver to maintain a predetermined frequency difference between the LO optical signal and a respective local oscillator of the second transceiver.
Dependencies are inferred from the claim text.