Incoherent light in tapered graded-index fibre: A study of transmission and modal noise

Piyamas Choochalerm; William E. Martin; Hugh R.A. Jones; Sarah Usher; Thomas A. Wright; Stephanos Yerolatsitis

doi:10.1016/j.yofte.2022.103140

Incoherent light in tapered graded-index fibre: A study of transmission and modal noise

Piyamas Choochalerm, William E. Martin, Hugh R.A. Jones, Sarah Usher, Thomas A. Wright, Stephanos Yerolatsitis

Department of Physics

Research output: Contribution to journal › Article › peer-review

2 Citations (SciVal)

Abstract

We investigated the impact of taper length on light transmission through tapered graded-index fibres. We tested commercial fibres from Thorlabs and a custom graded-index fibre using both coherent and incoherent light sources. Our experimental results show optimum performance for taper transition lengths of 25 mm, although our simulations suggest further improvement may be possible for even shorter transition lengths. We also measured the modal noise power fluctuations caused by bending the fibre. Here, we observe that the custom fibre tapers have the highest transmission but suffer from the most modal noise. Accordingly, we find that the commercial graded-index fibre tapers promise practical usage as a beam mode-field converter, as they have lower power fluctuations but retain relatively high transmission if compared to commercial small core step-index fibre.

Original language	English
Article number	103140
Journal	Optical Fiber Technology
Volume	75
Early online date	30 Nov 2022
DOIs	https://doi.org/10.1016/j.yofte.2022.103140
Publication status	Published - 31 Jan 2023

Bibliographical note

Funding Information:
PC is supported by a Thai Government PhD scholarship. Support for WM, HRAJ and the experimental setup is from the STFC Newton Fund ST/R006598/1, ST/P005667/1 and ST/T007311/1. SY and TW are funded by the EPSRC Proteus project EP/R005257/1.

Funding Information:
PC is supported by a Thai Government PhD scholarship . Support for WM, HRAJ and the experimental setup is from the STFC Newton Fund ST/R006598/1 , ST/P005667/1 and ST/T007311/1 . SY and TW are funded by the EPSRC Proteus project EP/R005257/1 .

Keywords

Adiabatic tapered fibre
Fibre transmission
Graded-index fibre
High-resolution spectrograph
Incoherent light source
Modal noise
Numerical aperture characterisation

ASJC Scopus subject areas

Control and Systems Engineering
Electronic, Optical and Magnetic Materials
Atomic and Molecular Physics, and Optics
Instrumentation
Electrical and Electronic Engineering

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10.1016/j.yofte.2022.103140Licence: CC BY

Cite this

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title = "Incoherent light in tapered graded-index fibre: A study of transmission and modal noise",

abstract = "We investigated the impact of taper length on light transmission through tapered graded-index fibres. We tested commercial fibres from Thorlabs and a custom graded-index fibre using both coherent and incoherent light sources. Our experimental results show optimum performance for taper transition lengths of 25 mm, although our simulations suggest further improvement may be possible for even shorter transition lengths. We also measured the modal noise power fluctuations caused by bending the fibre. Here, we observe that the custom fibre tapers have the highest transmission but suffer from the most modal noise. Accordingly, we find that the commercial graded-index fibre tapers promise practical usage as a beam mode-field converter, as they have lower power fluctuations but retain relatively high transmission if compared to commercial small core step-index fibre.",

keywords = "Adiabatic tapered fibre, Fibre transmission, Graded-index fibre, High-resolution spectrograph, Incoherent light source, Modal noise, Numerical aperture characterisation",

author = "Piyamas Choochalerm and Martin, {William E.} and Jones, {Hugh R.A.} and Sarah Usher and Wright, {Thomas A.} and Stephanos Yerolatsitis",

note = "Funding Information: PC is supported by a Thai Government PhD scholarship. Support for WM, HRAJ and the experimental setup is from the STFC Newton Fund ST/R006598/1, ST/P005667/1 and ST/T007311/1. SY and TW are funded by the EPSRC Proteus project EP/R005257/1. Funding Information: PC is supported by a Thai Government PhD scholarship . Support for WM, HRAJ and the experimental setup is from the STFC Newton Fund ST/R006598/1 , ST/P005667/1 and ST/T007311/1 . SY and TW are funded by the EPSRC Proteus project EP/R005257/1 . ",

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AU - Wright, Thomas A.

AU - Yerolatsitis, Stephanos

N1 - Funding Information: PC is supported by a Thai Government PhD scholarship. Support for WM, HRAJ and the experimental setup is from the STFC Newton Fund ST/R006598/1, ST/P005667/1 and ST/T007311/1. SY and TW are funded by the EPSRC Proteus project EP/R005257/1. Funding Information: PC is supported by a Thai Government PhD scholarship . Support for WM, HRAJ and the experimental setup is from the STFC Newton Fund ST/R006598/1 , ST/P005667/1 and ST/T007311/1 . SY and TW are funded by the EPSRC Proteus project EP/R005257/1 .

PY - 2023/1/31

Y1 - 2023/1/31

N2 - We investigated the impact of taper length on light transmission through tapered graded-index fibres. We tested commercial fibres from Thorlabs and a custom graded-index fibre using both coherent and incoherent light sources. Our experimental results show optimum performance for taper transition lengths of 25 mm, although our simulations suggest further improvement may be possible for even shorter transition lengths. We also measured the modal noise power fluctuations caused by bending the fibre. Here, we observe that the custom fibre tapers have the highest transmission but suffer from the most modal noise. Accordingly, we find that the commercial graded-index fibre tapers promise practical usage as a beam mode-field converter, as they have lower power fluctuations but retain relatively high transmission if compared to commercial small core step-index fibre.

AB - We investigated the impact of taper length on light transmission through tapered graded-index fibres. We tested commercial fibres from Thorlabs and a custom graded-index fibre using both coherent and incoherent light sources. Our experimental results show optimum performance for taper transition lengths of 25 mm, although our simulations suggest further improvement may be possible for even shorter transition lengths. We also measured the modal noise power fluctuations caused by bending the fibre. Here, we observe that the custom fibre tapers have the highest transmission but suffer from the most modal noise. Accordingly, we find that the commercial graded-index fibre tapers promise practical usage as a beam mode-field converter, as they have lower power fluctuations but retain relatively high transmission if compared to commercial small core step-index fibre.

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Incoherent light in tapered graded-index fibre: A study of transmission and modal noise

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

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