Photonics Research, 2021, 9 (1): 01000043, Published Online: Apr. 1, 2021  

On-chip reconfigurable mode converter based on cross-connected subwavelength Y-junctions Download: 614次

Author Affiliations
1 School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074, China
2 Department of Applied Physics, KTH Royal Institute of Technology, Stockholm 11419, Sweden
3 Wuhan National Laboratory for Optoelectronics, Wuhan 430074, China
Abstract
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, 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.

Longhui Lu, Deming Liu, Max Yan, Minming Zhang. On-chip reconfigurable mode converter based on cross-connected subwavelength Y-junctions[J]. Photonics Research, 2021, 9(1): 01000043.

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