Abstract
Microwave photonics, based on optical filtering techniques, are attractive for wideband signal processing and high-performance sensing applications, since it brings significant benefits to the fields by overcoming inherent limitations in electronic approaches and by providing immunity to electromagnetic interference. Recent developments in optical filtering based microwave photonics techniques are presented in this paper. We present single sideband modulation schemes to eliminate dispersion induced power fading in microwave optical links and to provide high-resolution spectral characterization functions, single passband microwave photonic filters to address the challenges of eliminating the spectral periodicity in microwave photonic signal processors, and review the approaches for high-performance sensing through implementing microwave photonics filters or optoelectronic oscillators to enhance measurement resolution.
Highlights
They are one of the most essential and fundamental building blocks for various signal-processing operations. Work in this field has attracted a great deal of attention, with recent trends being directed towards photonic integration, as reported by several groups spanning platforms such as silicon photonics [1,14,15], silicon nitride [16], and III–V semiconductors [17]
We present recent new optical filtering techniques for wideband signal processing via microwave photonics including optical single sideband modulation and spectral characterization, single passband microwave photonic filters exhibiting narrowband radio frequency (RF) response and shape-invariant tuning, and microwave photonics for sensing applications
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Summary
The low-loss and large available time-bandwidth product capability of fiber optic systems makes them attractive, for transmission of signals, and for processing of high-speed signals [1,2,3,4,5,6]. The second category is based on utilising optical filters to manipulate the RF sidebands of the modulation schemes and to realise single passband microwave photonic signal processors through direct mapping from the optical domain to the electrical domain [54,55,56,57,58,59,60,61,62,63,64,65,66,67,68,69] This technique features a simple configuration to achieve an extremely wide frequency tuning range.
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