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27 November 2012 A GRIN medium coupler and its application in light beam spot conversion
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GRIN medium with a lateral sech refractive index variation, can make normal-incident light beam gradually curve to the medium with a larger refractive index, and periodically converge the light beam to a point smoothly and continuously. This property of GRIN medium can be used as a coupl er to realize a mode spot size conversion. This paper mainly discussed the transmission property of Gaussian light beam in a sech GRIN medium by numerical simulation. SOI waveguide is widely used in the photonic integrated circuit. To achieve a higher coupling efficiency between single mode optical fiber and single mode SOI slab waveguide, which suffer a great light beam coupling loss for the mismatch of the spot size. The GRIN medium coupling structures are designed as a coupler, with symmetric refractive index distribution and asymmetric refractive index distribution. The insertion loss calculated in theory are 0.71dB and 1.35dB respectively, which has a significant improvement in coupling loss, compared with the 30dB coupling loss caused by direct butt -joint transmission.
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Ning Wang, Fangkui Sun, Qingfeng Li, and Lixue Chen "A GRIN medium coupler and its application in light beam spot conversion", Proc. SPIE 8559, Information Optics and Optical Data Storage II, 85590Q (27 November 2012);

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