Abstract

This paper proposes a novel all-optical fiber mode converter for mode conversion from ${\mathrm{LP}}_{01}$ to ${\mathrm{LP}}_{02}$ and vice versa. The mode converter is formed by connecting a single-mode fiber, a taper-core multi-mode fiber, and a few-mode fiber (FMF) together. The taper fiber core is designed to convert ${\mathrm{LP}}_{01}$ mode to ${\mathrm{LP}}_{02}$. The few-mode fiber is used to cut off the modes that are higher than ${\mathrm{LP}}_{02}$. It is shown that the proposed mode converter provides 20 dB extinction ratio and low insertion loss in a very broad optical bandwidth of 200 nm, from 1465 to 1665 nm. By further optimizing the FMF radius only for each of the O-, E-, S-, C-, U-, etc. bands, the mode converter can apply to any band of interest with higher performance. It is found that the performance of the mode converter has a large tolerance to structural parameters. The mode converter has the same performance in reciprocal operation, i.e., ${\mathrm{LP}}_{02}$ to ${\mathrm{LP}}_{01}$.

© 2019 Optical Society of America

Analysis of optical fiber-based LP₀₁ ↔ LP₀₂ mode converters for the O-, S-, and C-Band

Hakim Mellah, Xiupu Zhang, and Dongya Shen
Appl. Opt. 54(17) 5568-5575 (2015)

Universal LP₀₁ to LP_lm mode converter based on a bulk circular waveguide

Hakim Mellah and Xiupu Zhang
OSA Continuum 1(2) 426-437 (2018)

Design of broadband LP₀₁↔LP₀₂ mode converter based on special dual-core fiber for dispersion compensation

Ganbin Lin and Xiaopeng Dong
Appl. Opt. 51(19) 4388-4393 (2012)

Efficient broadband intracore grating LP₀₁–LP₀₂ mode converters for chromatic-dispersion compensation

Nguyen Hong Ky, H. G. Limberger, R. P. Salathé, and F. Cochet
Opt. Lett. 23(6) 445-447 (1998)

Mode add/drop multiplexers of LP₀₂ and LP₀₃ modes with two parallel combinative long-period fiber gratings

Liang Fang and Hongzhi Jia
Opt. Express 22(10) 11488-11497 (2014)