DIRECT-DETECTED ORTHOGONAL FREQUENCY-DIVISION MULTIPLEXING WITH DISPERSION PRE-COMPENSATION DIGITAL SIGNAL PROCESSING

摘要

Chromatic dispersion is pre-compensated in a direct-detected orthogonal frequency-division multiplexed optical transmitter through digital signal processing methods, to generate signals that can be transmitted over an optical fiber. The dispersion pre-compensation digital signal processing may include multiplying subcarriers by a respective factor. The dispersion pre-compensation digital signal processing may instead include application of a finite impulse response filter to signals. The dispersion pre-compensation digital signal processing may instead include fast Fourier transformations of signals, application of a frequency domain filter to signals generated by the fast Fourier transformations, and inverse fast Fourier transformations of the signals produced by application of the frequency domain filter.

主权项

1. A direct-detected orthogonal frequency-division multiplexing (DD-OFDM) optical signal transmitter, comprising:
an electrical-to-optical (E/O) converter; and a first transmit chain operable for performing operations to convert an input data stream into signals to be transmitted, the operations comprising dividing the input data stream into symbols, modulating the symbols onto subcarriers, and inverse fast Fourier transformations of the symbols, the first transmit chain further operable for selectively performing dispersion pre-compensation digital signal processing to generate in-phase and quadrature phase (I/Q) signals that are output to the E/O converter.