Journal
JOURNAL OF LIGHTWAVE TECHNOLOGY
Volume 38, Issue 2, Pages 215-225Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JLT.2019.2946171
Keywords
Optical switches; Optical fibers; Cavity resonators; Optical polarization; Optical resonators; Demultiplexing; laser modes; multiplexing; optical polarization; optical switches; silicon photonics; wavelength division multiplexing
Funding
- National Natural Science Foundation of China (NSFC) [61860206001/61835008]
- Science and Technology Commission of Shanghai Municipality [2017SHZDZX03/17500710900]
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Switching can be performed with multiple physical dimensions of an optical signal. Previously optical switching was mainly focused in the wavelength domain. In this paper we discuss the general architecture of integrated silicon photonic switches by exploiting multi-dimensions in wavelength, polarization, and mode. To route a data channel from one input port to an arbitrary output port in a network node, three basic functions are required: de-multiplexing, switching, and multiplexing. The multiplexing and de-multiplexing processes can be realized in any one physical dimension. The capacity of a switch can be effectively scaled by using joint physical dimensions. As two examples, we first present a wavelength switch based on dual-nanobeam cavities with high quality factors, a low power consumption, and a compact footprint. We then propose a design of a mode-polarization-wavelength selective switch by leveraging three physical dimensions, and experimentally demonstrate the building blocks and key functionalities.
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