System and method for performing high-speed communications over fiber optical networks

摘要

Processing a received optical signal in an optical communication network includes equalizing a received optical signal to provide an equalized signal, demodulating the equalized signal according to an m-ary modulation format to provide a demodulated signal, decoding the demodulated signal according to an inner code to provide an inner-decoded signal, and decoding the inner-decoded signal according to an outer code. Other aspects include other features such as equalizing an optical channel including storing channel characteristics for the optical channel associated with a client, loading the stored channel characteristics during a waiting period between bursts on the channel, and equalizing a received burst from the client using the loaded channel characteristics.

主权项

1. An optical transceiver module for an Optical Line Terminal (OLT); the optical transceiver module capable of transmitting continuous mode optical data signals on a first wavelength according to an m-ary modulation format and to equalize an optical data channel responsive to a received burst mode optical data signal on a second wavelength over a fiber optic cable, the optical transceiver module comprising:
a system interface for electrically coupling the optical transceiver module to the OLT and for communicating electrical binary data signals between the optical transceiver module and the OLT; a modulator electrically coupled to the system interface and configured to receive a first electrical binary data signal and to generate according to an m-ary modulation method a first electrical m-ary modulation signal representative of the data in the first electrical binary data signal; a driver electrically coupled to the modulator configured to amplify the first electrical m-ary modulation signal in order to drive an optical transmitter of the optical transceiver module; an optical transmitter electrically coupled to the driver configured to emit the optical continuous mode signal on the first wavelength on the fiber optic cable responsive to and representative of the amplified first electrical m-ary modulation signal; an optical detector configured to receive the burst mode optical data signal on the second wavelength from the fiber optic cable and generate a second electrical signal representative of the burst mode optical data signal; an amplifier electrically coupled to the optical detector and configured to amplify the second electrical signal to facilitate clock and data recovery of the second electrical signal; a clock data recovery and equalization unit electrically coupled to the amplifier and configured to equalize a burst mode channel, recover clock data timing and to generate a second electrical m-ary modulation signal; and a de-modulator electrically coupled to the system interface and electrically coupled to the clock data recovery and equalization unit and configured to generate a second electrical binary data signal representative of the data in the second electrical m-ary modulation signal; whereby the optical transceiver module converts electrical binary data communications from the OLT to optical m-ary data communications for communications over the fiber optical cable.