Mr. David Garcia Rodriguez Profile

David Garcia Rodriguez

at Ctr. de Tecnología Nanofotónica de Valencia

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Proceedings Article | 28 January 2017 Presentation + Paper

Mode-converter and multiplexer based on SOI technology for few-mode fiber at 1550 nm

David Garcia-Rodriguez, Juan Corral, Amadeu Griol, Roberto Llorente

Proceedings Volume 10130, 1013008 (2017) https://doi.org/10.1117/12.2252137

KEYWORDS: Waveguides, Silicon, Optical design, Wave propagation, Multiplexers, Directional couplers, Refractive index, Fiber couplers, Waveguide modes, Output couplers

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The Asymmetric Directional Coupler (ADC) based on SOI (Silicon-on-Insulator) technology converts and couples the fundamental mode to the first higher order mode. The ADC is designed to achieve phase-matching condition, which is accomplished when both propagation constants are equal in each waveguide arm. Devices are fabricated in a SOI wafer with a 220 nm thick silicon layer. The refractive indexes of Si and SiO₂ are n_Si=3.47 and n_Si02=1.46 respectively. The access waveguides (W₁=0.45 μm) have been designed to propagate just the fundamental mode, TE₀. The optimum width for the second waveguide was chosen to achieve the phase-matching condition for the TE₁ mode, which corresponds to W₂=0.962 μm. The coupling to the input and output waveguides is achieved through grating couplers. The input grating coupler will need to couple the LP₀₁ mode from the SSMF (Standard Single-Mode Fiber) to the TE₀ mode in the SOI waveguide; thus a typical design for a SOI coupler can be used. However, the output coupler must simultaneously couple the TE₀ and TE₁ modes in the SOI wide waveguide to the LP₀₁ and LP₁₁ modes in the FMF (Few-Mode Fiber). Input gratings are designed to have an area of 12x12 μm² and a period of Λ=610 nm in order to maximize the optical power coupled between the fiber and the waveguide for an incident angle of 10 degrees. Output gratings are designed with the same period but distinct area (12.5x12.5 μm²) to correctly couple the LP₀₁ and LP₁₁ modes in the FMF.

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