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Novel geometry fibres for use in optical communications and high power lasers

Novel geometry fibres for use in optical communications and high power lasers
Novel geometry fibres for use in optical communications and high power lasers
The progress Multi-element Fiber (MEF) for applications such as space-division-multiplexed transmission and multi-port amplifiers is reviewed. Error-free transmission of 1014GBps in a Ge-doped 3-element MEF (3-MEF) with an effective length of 28.5km has been demonstrated. Er-doped 3-MEF and 7-element MEF have been operated as core-pumped amplifiers with each element providing an average gain of 33dB with a NF of <5dB. A 5-element MEF cladding-pumped amplifier with 4-Er/Yb-doped signal fiber-elements surrounding an undoped multimode-pump fiber-element provided a maximum gain of 37±2dB in the C-band. The fiber-elements in cladding pump multi-element Er/Yb-doped fiber amplifier (ME-EYDFA) were cascaded to obtain a flat-gain of 36±1dB between 1544-1565nm. Both, Ge-doped MEF and cladding ME-EYDFA have been used to emulate a hypothetical SDM network system providing smooth upgrade, and ultralow crosstalk. Also, the amplifier have been extended in to develop a C+L split-band amplifier which provides >20dB gain in the wavelength range of 1536-1615nm (80nm) bandwidth.

Further, the progress towards Multi Trench Fiber (MTF) has been reviewed. This fiber can provide single mode operation for effective area (Aeff) as large as 10,000µm2 in rod-type configuration on the other hand it can provide 1000µm2 in bend configuration. MTF offers certain advantages of easy fabrication, easy splicing and cleaving over other fibers. A 30µm core MTF has been demonstrated, which shows a 50dB suppression of higher order modes. Modified version of MTF (Single trench fiber) can also be used in bend configuration for single mode operation while having core refractive index to be higher than cladding. This further reduces the fabrication cost associated with the fiber, hence makes it suitable for mass production. A single trench fiber laser of 20µm core (Aeff~400µm2) has been demonstrated to provide very high suppression of HOMs (~32dB using S2 measurement). Further, Hybrid-MTF with additional resonators has been investigated to tailor the dispersion.
Sahu, J.K.
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Jain, S.
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Jain, D.
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Thipparapu, N.K.
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May-Smith, T.
47952bbd-ce28-4507-a723-b4d80bf0f809
Sahu, J.K.
009f5fb3-6555-411a-9a0c-9a1b5a29ceb2
Jain, S.
bf4af598-26bf-47f4-a0a4-800095a23eb5
Jain, D.
787e5045-8862-46ba-b15e-82c2fe60495f
Thipparapu, N.K.
a36a2b4c-b75c-4976-a753-b5fab9e54150
May-Smith, T.
47952bbd-ce28-4507-a723-b4d80bf0f809

Sahu, J.K., Jain, S., Jain, D., Thipparapu, N.K. and May-Smith, T. (2014) Novel geometry fibres for use in optical communications and high power lasers. International Conference on Optics and Optoelectronics, Leeds, United Kingdom. 26 - 30 Jul 2014.

Record type: Conference or Workshop Item (Other)

Abstract

The progress Multi-element Fiber (MEF) for applications such as space-division-multiplexed transmission and multi-port amplifiers is reviewed. Error-free transmission of 1014GBps in a Ge-doped 3-element MEF (3-MEF) with an effective length of 28.5km has been demonstrated. Er-doped 3-MEF and 7-element MEF have been operated as core-pumped amplifiers with each element providing an average gain of 33dB with a NF of <5dB. A 5-element MEF cladding-pumped amplifier with 4-Er/Yb-doped signal fiber-elements surrounding an undoped multimode-pump fiber-element provided a maximum gain of 37±2dB in the C-band. The fiber-elements in cladding pump multi-element Er/Yb-doped fiber amplifier (ME-EYDFA) were cascaded to obtain a flat-gain of 36±1dB between 1544-1565nm. Both, Ge-doped MEF and cladding ME-EYDFA have been used to emulate a hypothetical SDM network system providing smooth upgrade, and ultralow crosstalk. Also, the amplifier have been extended in to develop a C+L split-band amplifier which provides >20dB gain in the wavelength range of 1536-1615nm (80nm) bandwidth.

Further, the progress towards Multi Trench Fiber (MTF) has been reviewed. This fiber can provide single mode operation for effective area (Aeff) as large as 10,000µm2 in rod-type configuration on the other hand it can provide 1000µm2 in bend configuration. MTF offers certain advantages of easy fabrication, easy splicing and cleaving over other fibers. A 30µm core MTF has been demonstrated, which shows a 50dB suppression of higher order modes. Modified version of MTF (Single trench fiber) can also be used in bend configuration for single mode operation while having core refractive index to be higher than cladding. This further reduces the fabrication cost associated with the fiber, hence makes it suitable for mass production. A single trench fiber laser of 20µm core (Aeff~400µm2) has been demonstrated to provide very high suppression of HOMs (~32dB using S2 measurement). Further, Hybrid-MTF with additional resonators has been investigated to tailor the dispersion.

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More information

Published date: July 2014
Venue - Dates: International Conference on Optics and Optoelectronics, Leeds, United Kingdom, 2014-07-26 - 2014-07-30
Organisations: Optoelectronics Research Centre

Identifiers

Local EPrints ID: 363308
URI: http://eprints.soton.ac.uk/id/eprint/363308
PURE UUID: 7b6bc9fc-24d1-4ce5-a2ef-5487394cb335
ORCID for J.K. Sahu: ORCID iD orcid.org/0000-0003-3560-6152
ORCID for N.K. Thipparapu: ORCID iD orcid.org/0000-0002-5153-4737

Catalogue record

Date deposited: 21 Mar 2014 12:25
Last modified: 12 Dec 2021 03:15

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Contributors

Author: J.K. Sahu ORCID iD
Author: S. Jain
Author: D. Jain
Author: N.K. Thipparapu ORCID iD
Author: T. May-Smith

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