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Investigation of phase-modulator-based all-optical bandpass microwave filter

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2 Author(s)
Fei Zeng ; Sch. of Inf. Technol. & Eng., Univ. of Ottawa, Ont., Canada ; Jianping Yao

Theoretical analysis and experimental implementation of an all-optical bandpass microwave filter are presented. Bandpass filtering is implemented using an electrooptic phase modulator combined with a dispersive device to eliminate the baseband resonance of a typical low-pass filter. In addition to bandpass operation, the proposed filter also provides an improved mainlobe-to-sidelobe ratio (MSR) and a reduced mainlobe bandwidth compared with those of the conventional microwave filters with windowing. A four-tap bandpass microwave filter with a 3-dB mainlobe bandwidth of 2.65 GHz and an MSR of 30 dB is demonstrated. The filter performances, including the reconfigurability, tunability, and the dynamic range, are also discussed.

Published in:

Lightwave Technology, Journal of  (Volume:23 ,  Issue: 4 )