Abstract
We propose a novel structure of complex-tap microwave photonic filter (MPF) employing an incoherent broadband optical source (BOS) and a programmable optical spectrum processor. By tailoring the optical spectral amplitude and phase, arbitrary complex continuous-time impulse responses of the MPF can be constructed. Frequency responses with a single flat-top, highly chirped, or arbitrary-shape passband are demonstrated, respectively. The passband center can also be tuned in a wide range only limited by the opto-electrical devices. To the best of our knowledge, it is the first demonstration of an incoherent-BOS-based MPF which is single-bandpass, widely tunable, and highly reconfigurable with complex taps.
Highlights
Microwave photonic filters (MPFs) which process high-frequency microwave signals in the optical domain have aroused people’s great interest in the past decades [1]
We propose a novel complex-tap MPF employing an incoherent broadband optical source (BOS) and a programmable optical spectrum processor
The other branch is spectrum tailored via a WaveShaper which is a commercial programmable optical processor [9], and time delayed via a variable optical delay line (VDL)
Summary
Microwave photonic filters (MPFs) which process high-frequency microwave signals in the optical domain have aroused people’s great interest in the past decades [1]. Single-sideband modulation (SSB) is employed, and the phase of the optical carrier is adjusted. Ideal complex taps can be generated, but the system complexity is high because wideband microwave 90° hybrid coupler or high-resolution optical spectrum processing is needed to implement SSB and optical carrier phase tuning. Another approximate method is using non-uniformly spaced optical carrier wavelengths [7]. Differential detection is further employed to significantly reduce the optical intensity noise To our knowledge, it is the first demonstration of a single-bandpass complex-tap MPF with high reconfigurability and wide tunability
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