期刊
OPTICS EXPRESS
卷 21, 期 6, 页码 7033-7040出版社
OPTICAL SOC AMER
DOI: 10.1364/OE.21.007033
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资金
- Spanish Ministerio de Ciencia [TEC2009-10152]
- Andalusian Regional Ministry of Science, Innovation and Business [P07-TIC-02946]
- European Mirthe project [FP7-2010-257980]
We propose an ultra-broadband multimode interference (MMI) coupler with a wavelength range exceeding the O, E, S, C, L and U optical communication bands. For the first time, the dispersion property of the MMI section is engineered using a subwavelength grating structure to mitigate wavelength dependence of the device. We present a 2 x 2 MMI design with a bandwidth of 450nm, an almost fivefold enhancement compared to conventional designs, maintaining insertion loss, power imbalance and MMI phase deviation below 1dB, 0.6dB and 3 degrees, respectively. The design is performed using an in-house tool based on the 2D Fourier Eigenmode Expansion Method (F-EEM) and verified with a 3D Finite Difference Time Domain (FDTD) simulator. (C) 2013 Optical Society of America
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