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Electrooptic phase tracking of microwave signals beyond 18.5 GHz using an integrated electrooptic modulator as an optoelectronic harmonic mixer in a phase lock loop

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4 Author(s)
Ci-Ling Pan ; Inst. of Electro-Opt. Eng., Nat. Chiao Tung Univ., Hsinchu, Taiwan ; Gong-Ru Lin ; Dean-Yu Chyou ; Hsiao-Hua Wu

We demonstrate electrooptic phase tracking of microwave signals beyond 18.5 GHz using a gain-switched laser diode as the optical clock. The key element of this system is a fiber-pigtailed integrated-optic Mach-Zehnder modulator (IOM). The IOM functions as an optoelectronic harmonic mixer in a phase lock loop. The conversion loss of the OEHM is 66 dB. The phase error and the single sideband phase noise density of the phase-locked 18.5 GHz signal is 5.6/spl times/10/sup /spl minus/5/ rad//spl radic/(Hz) and -54 dBc/Hz, respectively.<>

Published in:

Microwave and Guided Wave Letters, IEEE  (Volume:4 ,  Issue: 4 )