2 March 2007 Image quality improved 1X8 multimode interference coupler
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A novel design of multimode interference coupler with deeply etched air trenches at the boundary of the multimode section is proposed for photonic integrated circuitry on low-index-contrast materials. The device length decreases from 820 microns to 750 microns for a 1X8 polymer multimode interference coupler. Due to the enhanced optical confinement, the optimized coupler with air trenches experimentally achieved 0.28/0.23dB reduced insertion loss, 2.16/2.34dB improved contrast ratio for TE and TM polarization, compared with conventional multimode interference coupler. The device entirely covers the wavelength range of both C-band and L-band, which is sufficient for broad band communication.
© (2007) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Xiaolong Wang, Ray T. Chen, "Image quality improved 1X8 multimode interference coupler", Proc. SPIE 6475, Integrated Optics: Devices, Materials, and Technologies XI, 64751C (2 March 2007); doi: 10.1117/12.706291; https://doi.org/10.1117/12.706291

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