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A Degenerate-Mode-Selective Coupler for Stable DSP-free MDM Transmission

Weakly-coupled mode division multiplexing (MDM) has been intensively investigated in recent years. In order to be compatible with conventional intensity modulation and direct detection systems, effective solutions to handle degenerate non-circularly-symmetric linearly-polarized (LP) modes (LP lma and LP lmb modes, l ≥ 1) of weakly-coupled few-mode fibers (FMFs) are highly desired. In this paper, a novel degenerate-mode-selective coupler (DMSC) consisting of an input FMF and an output two-mode fiber (TMF) is proposed based on coupling mechanisms of a FMF directional coupler. Optical powers in both LP lma and LP lmb modes of the FMF of LP lm DMSC can be selectively and simultaneously transferred to the LP 11a and LP 11b modes of the TMF. Therefore, the DMSC can demultiplex degenerate non-circularly-symmetric LP modes without any digital signal processing (DSP). Necessary conditions for the DMSC are theoretically investigated. LP 11 and LP 21 DMSCs are numerically simulated to verify the principles and fabricated in the form of fused-type fiber couplers. Compared with regular mode-selective couplers (MSCs), the fabricated DMSCs significantly improve the power stability for demultiplexing randomly-rotated non-circularly-symmetric LP modes. Based on a mode demultiplexer composed of cascaded LP 02 MSC, LP 21 DMSC, LP 11 DMSC and LP 01 MSC, 4-LP-mode MDM transmission over 10-km of weakly-coupled FMF is demonstrated with 10-Gb/s on-off-keying and DSP-free direct detection.

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Informasi Detail

Judul Seri

JOURNAL OF LIGHTWAVE TECHNOLOGY; Vol.37 No.17 September 1 2019

No. Panggil

-

Penerbit

: .,

Deskripsi Fisik

p. 4410 - 4420

Bahasa

English

ISBN/ISSN

-

Klasifikasi

-

Tipe Isi

-

Tipe Media

-

Tipe Pembawa

-

Edisi

-

Subjek

OPTICAL FIBER COUPLERS
COUPLED-MODE THEORY
MODE (DE)MULTIPLEXERS

Info Detail Spesifik

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Pernyataan Tanggungjawab

Yuyang Gao, Jian Cui, Dawei Ge, Junchi Jia, Chunyan Du, Cen Xia, Yan Liu, Zhengbin Li, Yongqi He, Zhangyuan Chen, Juhao Li, Guifang Li

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