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Tunable mismatched twin-core fibre filters

Tunable mismatched twin-core fibre filters
Tunable mismatched twin-core fibre filters
Spectral filters are very important in optical fibre systems. Examples of their applicatinos are ASE filtering or gain-flattening in EDFA's. Current devices are basically bandpass filters based on thin film technology, which uses some bulk optic techniques, and loss filters based on long period gratings written in fibres. However, the response of these gratings is highly sensitive to-changes of temperature and strain, besides the grating strength decays over time. All-fibre filters based on twin-core fibres designed to phase-match at the filtering wavelength were demonstrated sometime ago. We present a highly reproducible and accurate way of tuning the coupling wavelength of a mismatched twin-core fibre over 500 nm wavelength range. The filter wavelength is controlled by reducing the fibre diameter on a coupler rig while the filter strength is tuned by adjusting the fibre length. Strain and temperature sensitivity of these filters have been also characterised. They present high environmental stability (~0.26 nm/100°C and 7.8x10 nm/µ epsilon) which allows easy packaging. Therefore, we demonstrate the implementation of a tunable, low loss and high quality all-fibre bandpass or bandstop filter.
Dong, L.
4a30a247-d676-42ef-aaf4-061579d6d64e
Ortega, B.
77f4ed17-921e-414a-ba73-ed3fa6cf4d02
Dong, L.
4a30a247-d676-42ef-aaf4-061579d6d64e
Ortega, B.
77f4ed17-921e-414a-ba73-ed3fa6cf4d02

Dong, L. and Ortega, B. (1998) Tunable mismatched twin-core fibre filters. Institute of Physics In-Fibre Bragg Gratings and Special Fibres, United Kingdom.

Record type: Conference or Workshop Item (Paper)

Abstract

Spectral filters are very important in optical fibre systems. Examples of their applicatinos are ASE filtering or gain-flattening in EDFA's. Current devices are basically bandpass filters based on thin film technology, which uses some bulk optic techniques, and loss filters based on long period gratings written in fibres. However, the response of these gratings is highly sensitive to-changes of temperature and strain, besides the grating strength decays over time. All-fibre filters based on twin-core fibres designed to phase-match at the filtering wavelength were demonstrated sometime ago. We present a highly reproducible and accurate way of tuning the coupling wavelength of a mismatched twin-core fibre over 500 nm wavelength range. The filter wavelength is controlled by reducing the fibre diameter on a coupler rig while the filter strength is tuned by adjusting the fibre length. Strain and temperature sensitivity of these filters have been also characterised. They present high environmental stability (~0.26 nm/100°C and 7.8x10 nm/µ epsilon) which allows easy packaging. Therefore, we demonstrate the implementation of a tunable, low loss and high quality all-fibre bandpass or bandstop filter.

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More information

Published date: 1998
Venue - Dates: Institute of Physics In-Fibre Bragg Gratings and Special Fibres, United Kingdom, 1998-01-01
Organisations: Optoelectronics Research Centre

Identifiers

Local EPrints ID: 76641
URI: https://eprints.soton.ac.uk/id/eprint/76641
PURE UUID: 1db49a90-00ea-414c-a2d1-40ee5eab02b1

Catalogue record

Date deposited: 11 Mar 2010
Last modified: 17 Jul 2019 00:14

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