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Proceedings Paper

Tailoring light-sound interactions in a single mode fiber for the high-power transmission or sensing applications
Author(s): Aamir Gulistan; M. M. Rahman; Souvik Ghosh; B. M. A. Rahman
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Paper Abstract

A full-vectorial numerically efficient Finite Element Method (FEM) based computer code is developed to study complex light-sound interactions in a single mode fiber (SMF). The SBS gain or SBS threshold in a fiber is highly related to the overlap between the optical and acoustic modes. For a typical SMF the acoustic-optic overlap strongly depends on the optical and acoustic mode profiles and it is observed that the acoustic mode is more confined in the core than the optical mode and reported overlap is around 94 % between these fundamental optical and acoustic modes. However, it is shown here that selective co-doping of Aluminum and Germanium in core reduces the acoustic index while keeping the optical index of the same value and thus results in increased acoustic- optic overlap of 99.7%. On the other hand, a design of acoustic anti-guide fiber for high-power transmission systems is also proposed, where the overlap between acoustic and optical modes is reduced. Here, we show that by keeping the optical properties same as a standard SMF and introducing a Boron doped 2nd layer in the cladding, a very low value of 2.7% overlap is achieved. Boron doping in cladding 2nd layer results in a high acoustic index and acoustic modes shifts in the cladding from the core, allowing much high power delivery through this SMF.

Paper Details

Date Published: 5 March 2018
PDF: 9 pages
Proc. SPIE 10714, Third International Conference on Photonics Solutions (ICPS2017), 1071403 (5 March 2018); doi: 10.1117/12.2296703
Show Author Affiliations
Aamir Gulistan, City Univ. of London (United Kingdom)
M. M. Rahman, City Univ. of London (United Kingdom)
Souvik Ghosh, City Univ. of London (United Kingdom)
B. M. A. Rahman, City Univ. of London (United Kingdom)

Published in SPIE Proceedings Vol. 10714:
Third International Conference on Photonics Solutions (ICPS2017)
Thawatchai Mayteevarunyoo, Editor(s)

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