Journal
JOURNAL OF LIGHTWAVE TECHNOLOGY
Volume 38, Issue 17, Pages 4780-4786Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JLT.2020.2995544
Keywords
Couplers; Couplings; Optical fiber couplers; Fabrication; Optical fiber polarization; Edge couplers; fiber-to-chip coupling; photonic integrated circuits; silicon photonics
Funding
- National Key R&D Program of China [2019YFB2203101]
- Natural Science Foundation of China (NSFC) [61805137, 61835008]
- Natural Science Foundation of Shanghai [19ZR1475400]
- Shanghai Sailing Program [18YF1411900]
- Open Project Program of Wuhan National Laboratory for Optoelectronics [2018WNLOKF012]
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Fiber-chip edge couplers are extensively used in integrated silicon photonic for the coupling of light between optical fibers and planar silicon waveguide circuits. Here, we experimentally demonstrate three kinds of edge couplers with eased fabrication process, two fork shape, and one dual-trident SWG shape, based on Silicon-on-Insulator platform. A commercial lensed fiber with mode field diameter of 6 mu m is used. The coupling performance and fabrication tolerance are theoretically analyzed and verified by 3D-FDTD simulation. The experimental results show that these edge couplers pose low coupling losses and large bandwidths simultaneously. At the wavelength of 1.55 mu m, the coupling losses are 1.25 dB/facet, 1.49 dB/facet, 1.82 dB/facet for fork1, fork2, and dual-trident SWG couplers, respectively. The measured wavelength bandwidths in which the loss below 2 dB are 114 nm, 102 nm, 92 nm, respectively.
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