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18 December 2012Design and simulation of a fiber to chip coupler designed on SOI platform with subwavelength grating
We report on a design for integrated surface diffraction grating fiber to chip coupler designed on Silicon-on-insulator
platform with subwavelength grating, which is compatible with 193 nm laser DUV lithography. Surface diffraction
grating couplers are perspective coupling solution, which extracts light from the Silicon-on-insulator wire waveguide and emits it towards an optical fiber placed over the SOI chip1. However, they are polarization and spectral sensitive. Efficient grating-to-fiber coupling requires matching the grating radiated field profile and the optical fiber mode. The aim of this design is the reducing back reflection of the fiber to chip coupler by using subwavelength grating for continuously tuning effective refractive index and tune the profile of diffracted power. The structure of designed fiber to chip coupler consists of relatively large tapered segment which adjusts cross-section of SOI wire waveguide to standard single mode fiber diameter and surface diffraction grating for vertical coupling to the fiber. The simulation of the fiber to chip coupler is performed by FDTD tool and BPM tool. The effective refractive index is tuned over diffraction grating by adjusting the duty cycle of the silicon in subwavelength grating inside the surface diffraction grating.
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Jozef Chovan, Anton Kuzma, František Uherek, "Design and Simulation of a Fiber to Chip Coupler Designed on SOI Platform with Subwavelength Grating," Proc. SPIE 8697, 18th Czech-Polish-Slovak Optical Conference on Wave and Quantum Aspects of Contemporary Optics, 86971S (18 December 2012);