Contents 1. Introduction
With the continuously increasing demand for more and more bandwidth, transmission at 100 Gb/s data rate became an objective of much interest. Obviously at such high data rates, fiber dispersion is becoming an issue and various approaches are presently considered, from low spectral bandwidth coding (e.g. AP-DQPSK) for long distance transmission to simpler multilane designs (e.g. Gb/s on 4 wavelengths) for short distances. In this context, and in spite of the inherent dispersion limitation, 100 Gb/s OOK modulation offers real advantages in terms of ultimate simplicity. Small footprint, low consumption and possibly low cost solutions are attractive aspects of such transmission format.
