2 March 2007 Image quality improved 1X8 multimode interference coupler
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Abstract
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.
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Xiaolong Wang, Xiaolong Wang, Ray T. Chen, 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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