We propose a system that can perform microwave bandpass filtering and phase shifting simultaneously without redundant optical–electrical and electrical–optical conversions. The principle is based on polarization-dependant phase modulation of a broadband optical source and the variable optical carrier time shift method. A single-bandpass microwave photonic filter with a central frequency of 10.8 GHz, a 3-dB bandwidth of 670 MHz, and a 360° phase tuning range is experimentally demonstrated. The capability of our configuration to implement wideband phase shifters is also verified.
© 2012 Optical Society of America
Fiber Optics and Optical Communications
Original Manuscript: December 28, 2011
Revised Manuscript: February 13, 2012
Manuscript Accepted: February 24, 2012
Published: May 9, 2012
Xiaoxiao Xue, Xiaoping Zheng, Hanyi Zhang, and Bingkun Zhou, "All-optical microwave bandpass filter and phase shifter using a broadband optical source and an optical phase modulator," Opt. Lett. 37, 1661-1663 (2012)