Title :
Generation and transmission of FM and π/4 DQPSK signals at microwave frequencies using harmonic generation and optoelectronic mixing in Mach-Zehnder modulators
Author :
Young, Tom ; Conradi, Jan ; Tinga, Wayne R.
Author_Institution :
Dept. of Electr. Eng., Alberta Univ., Edmonton, Alta., Canada
fDate :
3/1/1996 12:00:00 AM
Abstract :
A novel method of using the harmonic generation and optoelectronic mixing properties of Mach-Zehnder modulators to generate modulated subcarrier signals at high-order harmonics of the input signals is presented. The method permits the simultaneous transmission over optical fiber of a modulated and an unmodulated signal, both at high-order harmonic frequencies of the input signals, for the purpose of transmitting both a local oscillator tone and the modulated signal required at a base station for microcellular applications. We present the theory of operation and demonstrate the validity of the concept with a narrow band single-tone FM experiment as well as a 20-Mb/s π/4 DQPSK experiment
Keywords :
differential phase shift keying; frequency modulation; optical fibre communication; optical frequency conversion; optical harmonic generation; optical modulation; quadrature phase shift keying; π/4 DQPSK signals; 20 Mbit/s; FM signals; Mach-Zehnder modulator; harmonic generation; local oscillator tone; microcellular base station; microwave frequencies; optical fiber; optoelectronic mixing; subcarrier signals; Base stations; Central office; Frequency modulation; Interference; Microwave frequencies; Microwave generation; Millimeter wave technology; Optical fibers; Optical harmonic generation; Signal generators;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
