Design of PLC E31-E13 and E-LP tapered mode converters using fast quasiadiabatic dynamics

Han Wang; Takeshi Fujisawa; Takanori Sato; Masaki Wada; Takayoshi Mori; Taiji Sakamoto; Ryota Imada; Takashi Matsui; Kazuhide Nakajima; Kunimasa Saitoh

doi:10.1587/elex.20.20230392

LETTER

Design of PLC E₃₁-E₁₃ and E-LP tapered mode converters using fast quasiadiabatic dynamics

Han Wang, Takeshi Fujisawa, Takanori Sato, Masaki Wada, Takayoshi Mori, Taiji Sakamoto, Ryota Imada, Takashi Matsui, Kazuhide Nakajima, Kunimasa Saitoh

Author information

Han Wang
Graduate School of Information Science and Technology, Hokkaido University
Takeshi Fujisawa
Graduate School of Information Science and Technology, Hokkaido University
Takanori Sato
Graduate School of Information Science and Technology, Hokkaido University
Masaki Wada
NTT Access Network Service Systems Laboratories, NTT Corporation
Takayoshi Mori
NTT Access Network Service Systems Laboratories, NTT Corporation
Taiji Sakamoto
NTT Access Network Service Systems Laboratories, NTT Corporation
Ryota Imada
NTT Access Network Service Systems Laboratories, NTT Corporation
Takashi Matsui
NTT Access Network Service Systems Laboratories, NTT Corporation
Kazuhide Nakajima
NTT Access Network Service Systems Laboratories, NTT Corporation
Kunimasa Saitoh
Graduate School of Information Science and Technology, Hokkaido University

Keywords: mode converter, space division multiplexing, mode division multiplexing

JOURNAL FREE ACCESS

2023 Volume 20 Issue 23 Pages 20230392

DOI https://doi.org/10.1587/elex.20.20230392

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Abstract

The previous PLC E₃₁ and E₁₃ mode converters employ linear tapered structures to fulfill the adiabatic coupling condition and achieve a high mode conversion efficiency, which requires long taper lengths. In this paper, we propose two types of PLC tapered structures that can be applied in different scenarios using fast quasiadiabatic dynamics. These structures enable mode conversions of E₃₁-E₁₃ modes, as well as E₃₁-LP₀₂ and E₁₃-LP_21b modes, respectively. The E₃₁-E₁₃ mode converter can be reduced from the previous three-stage linear taper of 12000 µm to approximately 4000 µm in length. Similarly, the E₃₁-LP₀₂, E₁₃-LP_21b mode converter can be reduced from the previous two-stage linear taper of over 6000 µm to approximately 4000 µm in length.

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