All-Optical Tunable Multitap Microwave Photonic Filter Enabled by Fiber Optical Parametric Amplifier

Abstract

We propose and experimentally demonstrate an alloptical tunable microwave photonic filter (MPF) based on single pump fiber-based optical parametric amplifier (OPA). The delayline structure is achieved with a spool of dispersion-compensating fiber and a simple time-delay-compensating element. Owing to the idler generation during the OPA process, the frequency responses of 2-tap, 4-tap, and 8-tap MPFs are experimentally achieved by one, two, and four signal laser sources, respectively. Thus, ∼50% reduction on the number of laser sources is accomplished. The tunability of the filter transfer function can be achieved through either continuously tuning the wavelength spacing of the signals or changing the total dispersion value.Index Terms-Optical parametric amplifier, microwave photonic filter.

Electronically reconfigurable bandpass microwave photonic filter using a windowed optical frequency comb

“…Using microwave photonic filters (MPFs) to process microwave or radio frequency (RF) signals in the optical domain can bring advantages such as broad bandwidth, low loss, immunity to electromagnetic interference (EMI) and reconfigurable capability, thus addressing the limitations of conventional electronic approaches [1][2][3]. Then, microwave signals can be processed in the optical domain with the utilization of reconfigurable MPFs, which is attractive for applications such as radio-over-fiber (ROF) systems and optically controlled phased-array antennas.…”