期刊
OPTICS LETTERS
卷 38, 期 18, 页码 3608-3611出版社
OPTICAL SOC AMER
DOI: 10.1364/OL.38.003608
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资金
- Multidisciplinary University Research Initiative (MURI) program through the Air Force Office of Scientific Research (AFOSR) [FA 9550-08-1-0394]
We investigate the loss mechanism in three-moded multimode-interference couplers that are the building blocks of a compact and low-loss waveguide crossing structure. Broadband silicon waveguide crossing arrays with <0.01 dB insertion loss per crossing are proposed using cascaded multimode-interference couplers, where lateral subwavelength nanostructures are used to reduce the insertions loss. We design and fabricate a 101 x 101 waveguide crossing array with a pitch of 3.08 mu m. Insertion loss of similar to 0.02 dB per crossing and crosstalk <-40 dB at 1550 nm operating wavelength and a broad transmission spectrum ranging from 1520 to 1610 nm are experimentally demonstrated. (C) 2013 Optical Society of America
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