Optical transmission device

摘要

An optical transmission device for transmitting and receiving a multilevel-modulated optical signal includes a plurality of transmission frame processors for generating transmission frame signals accommodating a plurality of client signals that are each subjected to error correction processing and scrambling/descrambling processing, and a digital modulator/demodulator for mapping the transmission frame signals that are input to and output from the plurality of transmission frame processors to a multilevel signal. The digital modulator/demodulator performs digital modulation/demodulation, in which the plurality of transmission frame processors each have a function of shifting a phase of a pattern between a plurality of transmission frames to be mapped to a multilevel signal and to be digitally modulated/demodulated.

主权项

1. An optical transmission device for transmitting a multilevel-modulated optical signal, the device comprising:
a plurality of phase shifting devices that each shifts a phase of a pattern of a received client signal to produce a shifted pattern; a plurality of error correction processing devices that each performs an error correction process on the shifted pattern produced by a corresponding one of the phase shifting devices to produce an error correction processed shifted pattern; a plurality of scrambling devices that each scramble a corresponding one of the error correction processed shifted patterns to produce a scrambled pattern; a digital modulator that maps the scrambled patterns produced by the scrambling devices to multilevel signals, and digitally modulates the mapped multilevel signals to produce a multilevel-modulated electrical signal; and an electrical to optical converter that converts the multilevel-modulated electrical signal into the multilevel-modulated optical signal for optical transmission.