Abstract:

Mathematical analysis and comparison are made amonghigh speed optical modulation formats using LiNbO₃ optical waveguide modulators. The results indicate that the NRZ (non return-to-zero) format with compactmodulation bandwidth and simple configuration seems to be desirable in the highbit rate and short/medium distance optical fiber transmission. On the other hand, the CSRZ-DPSK (differential-phase-shift-keyed carrier-suppressed return-to-zero) format with better modulation spectrum, high dispersion and nonlinearity tolerance and moderate cost is shown to be one of the best choices for thehigh bitrate and long haul optical fiber transmission.

Key words: optical fiber communication technology, optical modulation format, LiNbO₃ modulator, optical fiber transmission