Silicon photonic switches are recognized as a key element in the applications of telecommunication networks, data center and high-throughput computing due to the low losses, low power consumption, large bandwidth and high integrated density. In this paper our recent works on silicon photonic switches for reconfigurable photonic integrated devices and circuits used in wavelength-division-multiplexing (WDM), mode-division-multiplexing (MDM), as well as hybrid WDM-MDM systems. First, high-performance Mach-Zehnder switches with an ultra-broad bandwidth, polarization-insensitivity, and low phase errors are reviewed. Second, wavelength-selective photonic switches based on MRRs are discussed. Finally, the progresses of multi-channel reconfigurable optical add-drop multiplexers are reviewed.
Silicon photonics has become very popular because of the compatibility with mature CMOS technologies. However, it is still very difficult for pure silicon to realize various photonic devices for large-scale photonic integrated circuits due to the material intrinsic properties. Currently silicon-plus photonics, which introduces some specific optoelectronic materials on silicon to overcome the shortcomings of silicon, is becoming more and more attractive a very important role. This paper gives a review and discussion on silicon-plus photonics, including the structures, devices and applications for on-chip light-manipulation and photodetection.
As the link capacity increases dramatically, it is also becoming more and more important to develop smart photonic networks-on-chip so that the bandwidth/channels can be utilized optimally and flexibly. One of the keys for realizing smart (reconfigurable) photonic networks is reconfigurable photonic integrated devices and circuits. As silicon has a large thermo-optic (TO) coefficient as well as a high heat conductivity, it is promising to realize efficient thermallyreconfigurable silicon photonic integrated devices and circuits with simple fabrication processes. This paper gives a review of our recent work on reconfigurable photonic integrated devices and circuits on silicon, including: (1) tunable microring-resonator (MRR)-based optical filters; (2) ultra-broadband optical switches; (3) monolithically-integrated reconfigurable optical add-drop multiplexers (ROADMs) for wavelength-division-multiplexing (WDM), mode-divisionmultiplexing (MDM), as well as hybrid WDM-MDM systems.
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