Title :
Dispersion-tolerant all-optical subcarrier modulator for broad-band BPSK transmissions
Author :
Loayssa, Alayn ; Benito, David
Author_Institution :
Dept. of Electr. & Electron. Eng., Public Univ. of Navarre, Pamplona, Spain
fDate :
4/1/2004 12:00:00 AM
Abstract :
We introduce a novel all-optical binary phase-shift keying (BPSK) subcarrier modulator based on commercial Mach-Zehnder electrooptic modulators (MZ-EOMs) that provides a dispersion-tolerant output signal with enhanced optical modulation depth. The design exploits the nonlinear transfer function of MZ-EOM to halve the frequency of the electrical signal required to generate a given subcarrier. Moreover, the bit rate of the data imposed on the subcarrier is shown to be constrained only by the bandwidth of the deployed MZ-EOM; hence, in principle, current commercial technology could provide BPSK modulation of microwave/millimeter-wave subcarriers at up to 40 Gb/s. The operation of the BPSK subcarrier modulator and its tolerance to chromatic dispersion impairments are experimentally demonstrated transmitting a 15-GHz subcarrier with 2.5-Gb/s BPSK modulation over a 25-km standard single-mode fiber link.
Keywords :
electro-optical modulation; microwave photonics; optical communication equipment; optical fibre communication; optical fibre dispersion; optical transfer function; phase shift keying; subcarrier multiplexing; 15 GHz; 2.5 Gbit/s; 25 km; MZ-EOM; Mach-Zehnder electrooptic modulators; all-optical subcarrier modulator; binary phase-shift keying; bit rate; broad-band BPSK transmissions; chromatic dispersion impairments; dispersion-tolerant signal; microwave subcarriers; millimeter-wave subcarriers; nonlinear transfer function; optical modulation depth; Binary phase shift keying; Electrooptic modulators; Frequency; Millimeter wave technology; Optical modulation; Phase modulation; Phase shift keying; Signal design; Signal generators; Transfer functions;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2004.824980
