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Generation and transmission of FM and π/4 DQPSK signals at microwave frequencies using harmonic generation and optoelectronic mixing in Mach-Zehnder modulators

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3 Author(s)
Young, T. ; Dept. of Electr. Eng., Alberta Univ., Edmonton, Alta., Canada ; Conradi, J. ; Tinga, W.R.

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

Published in:

Microwave Theory and Techniques, IEEE Transactions on  (Volume:44 ,  Issue: 3 )

Date of Publication:

Mar 1996

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