Abstract
Optoelectronic generation and processing of continuously tunable millimeter-wave are required in many analog optical-fiber transmission system. Conventionally, microwave signals can be generated by optical heterodyning of two distributed feedback (DFB) laser wavelengths with optical phase-lock loop.1 Such approach provides wide tuning range but becomes difficult at higher frequencies > 20 GHz due to the broad linewidth of semiconductor lasers. Monolithic mode-locked semiconductor laser with repetition frequencies range from a few GHz to several hundred GHz are ideal for generating millimeter-waves with fixed frequencies.3 In this paper, we propose and experimentally demonstrate a novel optoelectronic technique for continuously tunable millimeter-wave generation in which a mode-locked laser diode is employed in conjunction with an external electro-optic modulator (EOM) to generate millimeter-wave signal up to over 100 GHz.
© 1996 Optical Society of America
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