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Your search keyword '"Hosseini, Amir"' showing total 12 results
Start Over Author "Hosseini, Amir" Journal optics letters
12 results on '"Hosseini, Amir"'

9. Ultralow-loss silicon waveguide crossing using Bloch modes in index-engineered cascaded multimode-interference couplers

Author

Zhang, Yang, Hosseini, Amir, Xu, Xiaochuan, Kwong, David, and Chen, Ray T.

Abstract

We investigate the loss mechanism in three-moded multimode-interference couplers that are the building blocks of a compact and low-loss waveguide crossing structure. Broadband silicon waveguide crossing arrays with <0.01  dB insertion loss per crossing are proposed using cascaded multimode-interference couplers, where lateral subwavelength nanostructures are used to reduce the insertions loss. We design and fabricate a 101×101 waveguide crossing array with a pitch of 3.08 μm. Insertion loss of ∼0.02  dB per crossing and crosstalk <−40  dB at 1550 nm operating wavelength and a broad transmission spectrum ranging from 1520 to 1610 nm are experimentally demonstrated.

Published
2013

12. Optimum access waveguide width for 1 x N multimode interference couplers on silicon nanomembrane.

Author

Hosseini A, Subbaraman H, Kwong D, Zhang Y, and Chen RT

Abstract

We derived an analytical formula for the optimum width of the access waveguides of 1 x N multimode interference (MMI) couplers. Eigenmode-decomposition-based simulations show that the optimum width relation corresponds to the points of diminishing returns in both insertion loss and output uniformity versus access waveguide width. We fabricate and characterize 1 x 12 MMI couplers on a nanomembrane of silicon-on-insulator substrate. The experimental investigations demonstrate that the analytical results can be reliably used as a design rule for MMI couplers with large number of outputs.

Published
2010
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