A coherence-free microwave photonic filter configuration is presented. The configuration is based on a Sagnac loop interferometer containing a single-drive intensity modulator without a nonreciprocal bias unit. A notch response is obtained by modulating the clockwise and counterclockwise propagating waves inside the Sagnac loop at different times. A general theoretical analysis for both the reflected signal and the transmitted signal is obtained. Measured results verify the theoretical expressions and demonstrate a robust notch filter response.
© 2007 Optical Society of America
Fiber Optics and Optical Communications
Original Manuscript: February 16, 2007
Revised Manuscript: August 1, 2007
Manuscript Accepted: August 31, 2007
Published: October 4, 2007
Guoxiang Ning and Ping Shum, "Coherence-free microwave photonic notch filter with a single driver intensity modulator in a Sagnac fiber loop," Appl. Opt. 46, 7179-7183 (2007)