Title :
Overcoming chromatic-dispersion effects in fiber-wireless systems incorporating external modulators
Author :
Smith, Graham H. ; Novak, Dalma ; Ahmed, Zaheer
Author_Institution :
Dept. of Electr. & Electron. Eng., Melbourne Univ., Parkville, Vic., Australia
fDate :
8/1/1997 12:00:00 AM
Abstract :
We demonstrate two techniques to reduce the effects of fiber chromatic dispersion in fiber-wireless systems incorporating external modulators. We theoretically and experimentally show that the achievable link distance can be increased by varying the chirp parameter of the modulator to give large negative chirp using a dual-electrode Mach-Zehnder modulator (MZM) biased at quadrature. In addition, we show that dispersion can be almost totally overcome by implementing a simple method using the dual-electrode MZM to generate an optical carrier with single sideband (SSB) modulation. We demonstrate the transmission of a 51.8-Mb/s pseudorandom bit sequence (PRBS) at 12 GHz over 80 km of standard single-mode fiber using the SSB generator and measure a bit-error-rate (BER) power penalty due to fiber dispersion of less than 0.5 dB for a BER equal to 10-9
Keywords :
Mach-Zehnder interferometers; chirp modulation; digital communication; error statistics; microwave links; optical fibre communication; optical fibre dispersion; optical modulation; 12 GHz; 51.8 Mbit/s; 80 km; BER power penalty; SSB modulation; bit error rate; chirp parameter; chromatic-dispersion effects; dual-electrode Mach-Zehnder modulator; external modulators; fiber-wireless systems; link distance; optical carrier generation; pseudorandom bit sequence; single sideband modulation; single-mode fiber; Amplitude modulation; Chirp modulation; Intensity modulation; Optical fiber dispersion; Optical mixing; Optical modulation; Optical receivers; Photonics; Radio frequency; Signal generators;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
