Optimization of an optical single sideband transmitter

Abstract

The interest in single sideband modulation for transmission of digital data along optical fibers is growing, since it allows an improvement on the signal spectral efficiency and a reduction on the distortion produced by the fiber chromatic dispersion. In the optical single side band transmitter the influence of the Hilbert filter configuration and the modulation depth were analysed in order to optimize the performance of the optical system. For the 10 Gbit/s optical system presented, an optimum value of 0.2 is obtained for the modulation depth and a 4-tap transversal filter structure with an elementary time delay of 37.5ps is shown to be an appropriate solution to implement the Hilbert transform.