Photonic-assisted microwave frequency multiplication with a tunable multiplication factor (MF) based on an optical comb generator and an embedded single-passband microwave photonic filter (MPF) is proposed and demonstrated. The optical comb is generated using two cascaded modulators which are driven by a microwave reference signal. By applying the optical comb to a photodetector, a fundamental frequency corresponding to the comb spacing and its harmonics is generated. Thanks to the embedded single-passband MPF, only one harmonic is selected by the single-passband MPF. Thus, a single-frequency frequency-multiplied microwave signal is generated. In the proposed system, the embedded single-passband MPF is formed by using a sliced broadband optical source and a section of dispersion-compensating fiber (DCF). By tuning the central frequency of the passband at a frequency corresponding to that of a specific harmonic, a microwave signal at that specific frequency is generated. The proposed system is experimentally demonstrated. A frequency-multiplied microwave signal with an MF from 1 to 5 is generated. The phase noise and frequency tunability of the generated microwave signal are also investigated.
© 2013 Optical Society of America
Fiber Optics and Optical Communications
Original Manuscript: August 16, 2013
Revised Manuscript: September 24, 2013
Manuscript Accepted: September 24, 2013
Published: October 31, 2013
Liang Gao, Weilin Liu, Xiangfei Chen, and Jianping Yao, "Photonic-assisted microwave frequency multiplication with a tunable multiplication factor," Opt. Lett. 38, 4487-4490 (2013)