Ninety-deg. bends in low-index contrast waveguides

Lixia Li; Gregory P. Nordin; Jennifer M. English; Jianhua Jiang

doi:10.1117/12.474365

19 June 2003 Ninety-deg. bends in low-index contrast waveguides

Lixia Li, Gregory P. Nordin, Jennifer M. English, Jianhua Jiang

Proceedings Volume 4987, Integrated Optics: Devices, Materials, and Technologies VII; (2003) https://doi.org/10.1117/12.474365
Event: Integrated Optoelectronics Devices, 2003, San Jose, CA, United States

Abstract

We discuss the use of multiple layer air trench and silicon strip structures to realize high efficiency 90° bends for low index contrast waveguides. We use a micro-genetic algorithm (mGA) coupled with a 2-D finite difference time domain method to perform rigorous electromagnetic optimization of multi-layer structures for single mode waveguides. We find that a 3-layer air trench structure can be designed for a 90° waveguide bend that exhibits 97.2% efficiency for TM polarized light at a wavelength of 1.55 μm. We are also able to design five- and six-layer silicon strip bends that have high efficiency for both TE and TM polarizations. For example, simulation results for a six-layer design show 95.2% and 97.2% for TE and TM polarizations, respectively. Moreover, the bend efficiency for each polarization state is greater than 90% over a broad wavelength range (1.5 μm to 1.7 μm).

Citation Download Citation

Lixia Li, Gregory P. Nordin, Jennifer M. English, and Jianhua Jiang "Ninety-deg. bends in low-index contrast waveguides", Proc. SPIE 4987, Integrated Optics: Devices, Materials, and Technologies VII, (19 June 2003); https://doi.org/10.1117/12.474365

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