Dispersion management is highly desired in various applications such as microwave photonics and optical communication, helping reduce the delay disorder and modulate the pulse profiles. In this paper, we propose a new concept of digitally-tunable dispersion management. and a digitally-tunable dispersion controller (DTDC) on silicon composed of optical switches and chirped multimode waveguide gratings (CMWGs) is demonstrated for the first time. All the CMWGs are identical and have the same dispersion value of D0 and dispersion ranging from 0 to (2N-1)D0 can be tuned with a step of D0 by switching the propagation path of light. More importantly, the DTDC is circulator-free. finally, a DTDC is realized with four stages of 2-mm-long CMWGs, enabling the dispersion tuning from 0 to 42.8 ps/nm with a step of 2.82 ps/nm.
Silicon photonics is recognized as one of the most promising platforms for on-chip optical interconnects. In order to further enhance the on-chip optical-interconnect link capacity, silicon photonic devices for advanced multiplexing technologies have been widely investigated, including wavelength-division-multiplexing (WDM), mode-divisionmultiplexing (MDM), as well as the hybrid multiplexing. This paper gives a review for our recent progresses in the development of silicon-based on-chip wavelength/mode-division-multiplexers.
Multimode silicon photonics have drawn tremendous attention because the introduction of higher-order modes greatly enhances the capacity of mode-division-multiplexing (MDM) data transmission systems as well as improves the flexibility of on-chip photonic device designs. As the cornerstone of multimode silicon photonics, plentiful multimodemanipulation photonic devices have been developed successfully. On the other hand, more and more emerging applications have been stimulated by higher-order modes introduced in multimode silicon photonics. This paper gives a review for our recent processes in the development of multimode silicon photonic devices. Keywords: mode, multiplexer, conversion, bend, filter, silicon, waveguide.
Reconfigurable photonic integrated devices are playing in smart photonic networks, so that it is possible to utilize the resources of the bandwidth/channels optimally and flexibly. Since silicon photonics has become one of the most popular technologies for realizing photonic chips currently, in this paper we focus on our recent work for reconfigurable photonic integrated devices on silicon. It includes the following three parts. The first part is for thermally-tunable optical filters based on micro-ring resonators (MRRs) and waveguide gratings. The second part is for thermo-optic switches, which are designed to be ultra-broad band and polarization-insensitive. The third part is for all-optically reconfigurable photonic integrated devices on silicon.
The development of smart photonic networks has been developing for a long time in order to utilize the bandwidth/channels optimally and flexibly. As the link capacity increases dramatically by introducing advanced multiplexing technologies, the development of smart photonic networks is even becoming more important and more complicated. The key for the realization of smart photonic networks is reconfigurable photonic integrated devices and circuits. As silicon photonics has been developed as an excellent platform for PICs in the past years, in this paper we gives a review of our recent work on reconfigurable photonic integrated devices and circuits on silicon for wavelengthdivision-multiplexing (WDM), mode-division-multiplexing (MDM), as well as hybrid WDM-MDM systems. It includes (1) 2×2 optical switches, and (2) monolithically-integrated reconfigurable optical add-drop multiplexers (ROADMs).
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