Patent ID: 7672593

Claim:
An OTDM transmission method for implementing distortion-free transmission in the presence of linear time distortion in the optical fiber transmission line, the method comprising the steps of using a transform-limited pulse having an exact spectral width with respect to the time-domain waveform as an optical time-division multiplexed (OTDM) signal pulse train; converting the OTDM signal pulse train to a spectrum sequence of wavelength division multiplexed (WDM) signal by means of an optical Fourier transform circuit for converting an optical pulse waveform in the time domain to a frequency spectral profile of the pulse wherein the converted optical pulse train is incident on an optical fiber transmission line; and converting the WDM signal spectral sequence after transmission in the optical fiber transmission line to an OTDM signal pulse train by means of an optical inverse Fourier transform circuit for receiving an optical pulse train incident on the optical fiber transmission line and transmitted in the optical fiber transmission line and converting the frequency spectral profile to the optical pulse waveform of the pulse in the time domain, to regenerate the time-domain waveform of the OTDM signal pulse train before transmission; wherein the optical Fourier transform circuit comprises a phase modulator driven by a repetition frequency of 1/N of the transmission rate of the OTDM signal pulse train (N is an integer) and a dispersion element for giving group-velocity dispersion; and a train of N-channel OTDM signal pulses is converted to a sequence of N-channel WDM signal spectrums.