Distributed optical fibre sensing at 1.65µm using a Q-switched fibre laser
Distributed optical fibre sensing at 1.65µm using a Q-switched fibre laser
It is becoming increasingly vital to monitor telecommunication links during operation and installation process. By using a high peak power source and the optical time domain reflectometry (OTDR) technique operating at the wavelength region of 1.6µm, it is possible to monitor conventional C-band Erbium-doped fibre amplifier (EDFA) systems whilst transmitting data, and to characterise losses at the higher wavelengths of extended bandwidth systems designed around the L-band EDFA systems. We describe a compact design based on Raman shifting the output of an Erbium-doped Q-switched fibre laser operating at 1.5µm for obtaining a pulsed source at 1.6µm. This source was used for an OTDR measurement and also as a source for a 1.65µm Raman-based distributed temperature sensor, in contrast to distributed temperature sensors normally operating at 1.5µm. OTDR measurements at 1.65µm provide more accurate determination of macro and micro-bend losses than at 1.5µm as such losses increase with wavelength. The temperature measurement extracted from the anti-Stokes Raman signal at 1.5µm was made over a sensing range of 10.1km, with a spatial resolution of 10m and temperature resolution of 4°C.
Kee, H.H.
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Lees, G.P.
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Newson, T.P.
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Kee, H.H.
2417a0d4-8d5b-447d-8ce7-dda23028ca70
Lees, G.P.
0c1c9d69-debd-4e3c-a159-b3463564ca2e
Newson, T.P.
6735857e-d947-45ec-8163-54ebb25daad7
Kee, H.H., Lees, G.P. and Newson, T.P.
(2000)
Distributed optical fibre sensing at 1.65µm using a Q-switched fibre laser.
ISAP 2000, Glasgow, UK.
22 - 24 May 2000.
Record type:
Conference or Workshop Item
(Paper)
Abstract
It is becoming increasingly vital to monitor telecommunication links during operation and installation process. By using a high peak power source and the optical time domain reflectometry (OTDR) technique operating at the wavelength region of 1.6µm, it is possible to monitor conventional C-band Erbium-doped fibre amplifier (EDFA) systems whilst transmitting data, and to characterise losses at the higher wavelengths of extended bandwidth systems designed around the L-band EDFA systems. We describe a compact design based on Raman shifting the output of an Erbium-doped Q-switched fibre laser operating at 1.5µm for obtaining a pulsed source at 1.6µm. This source was used for an OTDR measurement and also as a source for a 1.65µm Raman-based distributed temperature sensor, in contrast to distributed temperature sensors normally operating at 1.5µm. OTDR measurements at 1.65µm provide more accurate determination of macro and micro-bend losses than at 1.5µm as such losses increase with wavelength. The temperature measurement extracted from the anti-Stokes Raman signal at 1.5µm was made over a sensing range of 10.1km, with a spatial resolution of 10m and temperature resolution of 4°C.
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e-pub ahead of print date: 2000
Additional Information:
4074-35
Venue - Dates:
ISAP 2000, Glasgow, UK, 2000-05-22 - 2000-05-24
Organisations:
Optoelectronics Research Centre
Identifiers
Local EPrints ID: 16946
URI: http://eprints.soton.ac.uk/id/eprint/16946
PURE UUID: d39f2a6e-70b9-411d-96f1-f688672415df
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Date deposited: 19 Aug 2005
Last modified: 15 Mar 2024 05:49
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Contributors
Author:
H.H. Kee
Author:
G.P. Lees
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