Low-Loss and Broadband Nonvolatile Phase-Change Directional Coupler Switches
By Peipeng Xu, Jiajiu Zheng, J. Doylend, Arka Majumdar. ACS Photonics, 2018
225 citations recorded by the source corpus.
An optical equivalent of the field-programmable gate array (FPGA) is of great interest to large-scale photonic integrated circuits. Previous programmable photonic devices relying on the weak, volatile thermo-optic or electro-optic effect usually suffer from a large footprint and high energy consumption. Phase change materials (PCMs) offer a promising solution due to the large nonvolatile change in the refractive index upon phase transition. However, the large optical loss in PCMs poses a serious problem. Here, by exploiting an asymmetric directional coupler design, we demonstrate nonvolatile PCM-clad silicon photonic 1 × 2 and 2 × 2 switches with a low insertion loss of ∼1 dB and a compact coupling length of ∼30 μm while maintaining a small crosstalk less than −10 dB over a bandwidth of 30 nm. The reported optical switches will function as the building blocks of the meshes in the optical FPGAs for applications such as optical interconnects, neuromorphic computing, quantum computing, and microwave photonics.
Subfields: Artificial Intelligence, Electrical and Electronic Engineering, Materials Chemistry
View Paper: https://www.semanticscholar.org/paper/6f87e938693a1610000aeeb150f2e824bbbecab4
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Citations in the corpus
- Miniature Multilevel Optical Memristive Switch Using Phase Change Material (2019, background): “Such features have led to the development of on-chip non-volatile photonic applications, such as nanopixel display [16, 17], photonic synapse [18, 19], optical computing [20], and optical switching [21-24].”