On-chip reconfigurable mode converter based on cross-connected subwavelength Y-junctions

Lu, LonghuiSchool of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan, China (author)

A novel power-efficient reconfigurable mode converter is proposed and experimentally demonstrated based on cross-connected symmetric Y-junctions assisted by thermo-optic phase shifters on a silicon-on-insulator platform. Instead of using conventional Y-junctions, subwavelength symmetric Y-junctions are utilized to enhance the mode splitting ability. The reconfigurable functionality can be realized by controlling the induced phase differences. Benefited from the cross-connected scheme, the number of heating electrodes can be effectively reduced, while the performance of the device is maintained. With only one-step etching, our fabricated device shows the average insertion losses and cross talks are less than 2.45 and −16.6 dB−16.6 dB, respectively, measured with conversions between two arbitrary compositions of the first four TE modes over an observable 60 nm bandwidth. The converter is switchable and CMOS-compatible, and could be extended for more modes; hence, it can be potentially deployed for advanced and flexible mode multiplexing optical networks-on-chip.

Liu, DemingSchool of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan, China (author)
Yan, MaxDepartment of Applied Physics, KTH Royal Institute of Technology, Stockholm, Sweden(Swepub:umu)maya0028 (author)
Zhang, MinmingSchool of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan, China; Wuhan National Laboratory for Optoelectronics, Wuhan, China (author)
School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan, ChinaDepartment of Applied Physics, KTH Royal Institute of Technology, Stockholm, Sweden (creator_code:org_t)

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