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Optica Publishing Group
  • Journal of Lightwave Technology
  • Vol. 37,
  • Issue 17,
  • pp. 4260-4267
  • (2019)

Preserving Nearly Diffraction-Limited Beam Quality Over Several Hundred Meters of Transmission Through Highly Multimode Fibers

Open Access Open Access

Abstract

The influence of the core diameter and the fiber length on the beam quality of the transmitted beam was investigated theoretically and experimentally for highly multimode step-index fibers with a numerical aperture of 0.22 using a fully monolithic setup. We show that it is possible to maintain a nearly diffraction-limited beam quality (M $^{2}\boldsymbol{\approx }$ 1.3) through 100 m long multimode fibers. For a core diameter of $60\,\boldsymbol{\mu}$ m and a fiber length of 380 m one can still deliver a beam with an M $^{2}$ value of 2.1. The high-power suitability of this approach was shown by transmitting 1 kW of power through a 100 m long fiber with a core diameter of $60\,\boldsymbol{\mu}$ m without the onset of stimulated Raman scattering while maintaining a nearly diffraction-limited beam quality (M $^{2} \boldsymbol{\approx }$ 1.3).

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