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Updated: Jun 21, 2026

Low-cost Custom Fabrication and Mode-locked Operation of an All-normal-dispersion Femtosecond Fiber Laser for Multiphoton Microscopy
Published on: November 22, 2019
Adiabatically tapered splice for selective excitation of the fundamental mode in a multimode fiber
Yongmin Jung1, Yoonchan Jeong, Gilberto Brambilla
1Optoelectronics Research Centre, University of Southampton, Southampton, SO17 1BJ, UK. ymj@orc.soton.ac.uk
Abstract:
We propose a simple and effective method to selectively excite the fundamental mode of a multimode fiber by adiabatically tapering a fusion splice to a single-mode fiber. We experimentally demonstrate the method by adiabatically tapering splice (taper waist=15 microm, uniform length=40 mm) between single-mode and multimode fiber and show that it provides a successful mode conversion/connection and allows for almost perfect fundamental mode excitation in the multimode fiber. Excellent beam quality (M(2) approximately 1.08) was achieved with low loss and high environmental stability.
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