Abstract
Microwave photonics (MWP) is an emerging filed in which photonic technologies are employed to enable and enhance functionalities in microwave systems which are usually very challenging to fulfill directly in the microwave domain. Various photonic devices have been used to achieve the functions. A fiber Bragg grating (FBG) is one of the key components in microwave photonics systems due to its unique features such as flexible spectral characteristics, low loss, light weight, compact footprint, and inherent compatibility with other fiber-optic devices. In this paper, we discuss the recent development in employing FBGs for various microwave photonics subsystems, with an emphasis on subsystems for microwave photonic signal processing and microwave arbitrary waveform generation. The limitations and potential solutions are also discussed.
Highlights
Microwave photonics is an area that studies the interaction between microwave and optical waves for the generation, distribution, control, processing and analysis of microwave signals by means of photonics [1,2,3,4,5,6]
Most of microwave photonics systems are designed to operate at the 1550 nm band, to take advantage of the lowcost photonic devices developed for fiber optic communications in this wavelength band
An intuitive explanation of the dispersion of a chirped fiber Bragg grating (FBG) is that different spectral components of an optical signal experience different time delays as the spectral components are reflected from different positions of the chirped FBG
Summary
Microwave photonics is an area that studies the interaction between microwave and optical waves for the generation, distribution, control, processing and analysis of microwave signals by means of photonics [1,2,3,4,5,6]. Thanks to the important and unique features including flexible spectral characteristics [8], all-fiber geometry, low insertion loss, compact size, and low cost, FBGs have been deeply investigated for wide-spread applications [9], such as in fiber-optic communications [10], optical sensors [11], and photonic signal processing [12]. An FBG can serve in a microwave photonics system as a dispersive delay-line element, a narrowband optical band-pass or band-stop filter, or a broadband complex optical spectrum shaper. We discuss the recent development in employing FBGs for various microwave photonics subsystems, with an emphasis on subsystems for microwave photonic signal processing and microwave arbitrary waveform generation.
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