Abstract

Different fibers generally have different mode characteristics so their connections in many practical applications often require mode conversion. The feasibility of mode conversion between fibers with different refractive index distributions based on adiabatically tapered structures is theoretically analyzed. The first kind of mode conversion is between ring core fiber and convex core fiber; the second kind is between multicore fiber and single-core fiber. Three common tapered structures are investigated: tapered core, diffused core, and tapered cladding. The analysis results show that mode conversion by a tapered structure is not suitable for all the modes for a ring core fiber and a convex core fiber; however, it can be accomplished for multicore fiber and single-core fiber.

© 2023 Optica Publishing Group

Silicon-tapered waveguide for mode conversion in metal–insulator–metal waveguide-based plasmonic sensor for refractive index sensing

N. L. Kazanskiy, M. A. Butt, and S. N. Khonina
Appl. Opt. 62(32) 8678-8685 (2023)

Multiplexed dual-point refractive index sensor based on cascaded up-down tapered hetero-core structured fiber

Sura Hussein Mahmood, Sarah Kadhim Al-Hayali, and Abdulhadi Al-Janabi
Opt. Continuum 2(12) 2451-2467 (2023)

Adiabatically-tapered fiber mode multiplexers

S. Yerolatsitis, I. Gris-Sánchez, and T. A. Birks
Opt. Express 22(1) 608-617 (2014)

Endlessly adiabatic fiber with a logarithmic refractive index distribution

K. Harrington, S. Yerolatsitis, D. Van Ras, D. M. Haynes, and T. A. Birks
Optica 4(12) 1526-1533 (2017)

Highly sensitive temperature and refractive index sensor based on no-core fiber cascaded with a balloon-shaped bent single-mode fiber

Xiaojun Zhu, Mengqiang Song, Xing Liu, Wen Liu, Yongquan Pan, Juan Cao, Guoan Zhang, Yongjie Yang, Yuechun Shi, and Wuming Wu
Appl. Opt. 62(35) 9266-9273 (2023)