Demonstration of Optical Duobinary Transmission System Using Phase Modulator and Optical Filter
01 July 2002
We experimentally demonstrate an optical duobinary transmission system employing a phase modulator and a narrow-bandwidth optical filter. Compared to the conventional duobinary signal generated by using an electrical low-pass filter, the demonstrated duobinary signal (1) provides improved receiver sensitivity, (2) overcomes the problem associated with word lengths, and (3) substantially relaxes the performance sensitivity to the driver and modulator response, while maintaining narrow spectral bandwidth and high dispersion tolerance.