Abstract
Integrated Microwave photonics (IMWP) signal processing using Photonic Integrated Circuits (PICs) has attracted a great deal of attention in recent years as an enabling technology for a number of functionalities not attainable by purely microwave solutions. In this context, integrated waveguide Bragg grating (WBG) devices constitute a particularly attractive approach thanks to their compactness and flexibility in producing arbitrarily defined amplitude and phase responses, by directly acting on coupling coefficient and perturbations of the grating profile. In this article, we review recent advances in the field of integrated WBGs applied to MWP, analyzing the advantages leveraged by an integrated realization. We provide a perspective on the exciting possibilities offered by the silicon photonics platform in the field of MWP, potentially enabling integration of highly-complex active and passive functionalities with high yield on a single chip, with a particular focus on the use of WBGs as basic building blocks for linear filtering operations. We demonstrate the versatility of WBG-based devices by proposing and experimentally demonstrating a novel, continuously-tunable, integrated true-time-delay (TTD) line based on a very simple dual phase-shifted WBG (DPS-WBG).
Highlights
The large amount of work done in the field of microwave photonics (MWP) [1,2,3] has shown that the use of optical technology can provide unprecedented performance and novel functionalities to the generation, transport, and processing of radio waves with frequencies up to the THz range
To illustrate further the unique potential of WBG for MWP signal processing applications, we report here a novel demonstration of a continuously tunable delay unit realized by means of a dual phase-shifted waveguide Bragg grating (DPS-WBG)
In this paper we have reviewed recent advances on implementations of MWP functionalities using WBGs, with particular emphasis to the performance improvements offered by the integrated realization of these devices
Summary
The large amount of work done in the field of microwave photonics (MWP) [1,2,3] has shown that the use of optical technology can provide unprecedented performance and novel functionalities to the generation, transport, and processing of radio waves with frequencies up to the THz range. The possibility of implementing these fiber devices in integrated platforms (on-chip), so-called waveguide Bragg gratings (WBGs), has attracted considerable recent attention, with several demonstrated applications in the MWP context, as will be reviewed in Section 4 of this paper. This prospect is especially promising to overcome the intrinsic limitations (high cost, bulkiness, high power consumption etc.) of MWP devices and systems based on discrete components (e.g. FBGs) by realization of entire functionalities on a chip, a field that is usually referred to as integrated MWP (IMWP) [5].
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