Affiliation:
1. Optics Valley Laboratory
Abstract
Mode-division multiplexing (MDM) has been extensively utilized to expand the capacity of chip-scale or fiber-based optical communication, whereas it is still challenging to implement the MDM for fiber-chip optical interconnects due to the huge mode mismatch between few-mode fiber (FMF) and multi-mode waveguide. In this work, we propose and design a silicon integrated six-mode edge coupler assisted with a slot waveguide, which achieves the efficient direct conversion of multiple modes between the waveguide and fiber in a broad bandwidth. Based on the principle of mode conversion, this edge coupler enables the mode conversion between six linear polarization (LP) modes (i.e.
LP
x/y
01
,
LP
x/y
11a
,
LP
x/y
11
b
) in FMF and six on-chip waveguide modes (i.e. TE0, TE1, TE2, TM0, TM1, TM2) with low insertion loss, low mode crosstalk and broad bandwidth. The obtained results show that over the whole C-band the efficiency of mode conversion is higher than 98% and the mode crosstalk is low than -19 dB, while the total coupling loss is higher than 85%. The favorable results offer an important reference for designing related broadband photonic devices, and the presented scheme could be potentially exploited to further increase the transmission capability for prospective fiber-chip optical interconnections and communications.
Funder
National Key Research and Development Program of China
National Natural Science Foundation of China
the Key R&D Program of Hubei Province of China
the Key R&D Program of Guangdong Province
the Science and Technology Innovation Commission of Shenzhen
Fundamental Research Funds for the Central Universities
Subject
Atomic and Molecular Physics, and Optics
Cited by
1 articles.
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1. Fiber-Chip Link via Mode Division Multiplexing;IEEE Photonics Technology Letters;2023-10-01