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Low-cost monitoring of the wavelength difference of two transmitters for two-way time transfer over optical fibre

Low-cost monitoring of the wavelength difference of two transmitters for two-way time transfer over optical fibre
Low-cost monitoring of the wavelength difference of two transmitters for two-way time transfer over optical fibre
Accurate time transfer is routinely performed using GPS, however an order of magnitude better accuracy can be achieved when signal transfer over optical fibres is used (e.g., in [1], fibre transfer over 73 km with <100 ps precision was achieved as compared to <700 ps for the GPS-based system). Unfortunately, the propagation delay through an optical fibre changes due to temperature variation. This is commonly compensated for by transferring the time information bi-directionally over a single optical fibre with subsequent cancellation of the propagation delay variations [1]. However, to avoid any signal degradation due to Rayleigh back-scattering and reflections at fibre connectors, it would be advantageous to transmit the information in both directions using different wavelength, each of them in a unidirectional sense [2]. However, this requires two transmitters operating at different wavelengths. Due to the limited stability of (low-cost) telecom-grade transmitters (generally ±0.1nm [3]), the propagation delay in both directions can change in an uncorrelated manner and thus could not be compensated by a known stable difference, degrading the precision of the time transfer.
Slavík, Radan
2591726a-ecc0-4d1a-8e1d-4d0fd8da8f7d
Vojtěch, Josef
0a0a4ae8-0146-4fcf-812d-6dc31490e781
Smotlacha, Vladimir
7915dd22-4285-46a4-98d0-c1e8f4e34f0b
Slavík, Radan
2591726a-ecc0-4d1a-8e1d-4d0fd8da8f7d
Vojtěch, Josef
0a0a4ae8-0146-4fcf-812d-6dc31490e781
Smotlacha, Vladimir
7915dd22-4285-46a4-98d0-c1e8f4e34f0b

Slavík, Radan, Vojtěch, Josef and Smotlacha, Vladimir (2015) Low-cost monitoring of the wavelength difference of two transmitters for two-way time transfer over optical fibre. CLEO Europe, Germany. 21 - 25 Jun 2015.

Record type: Conference or Workshop Item (Paper)

Abstract

Accurate time transfer is routinely performed using GPS, however an order of magnitude better accuracy can be achieved when signal transfer over optical fibres is used (e.g., in [1], fibre transfer over 73 km with <100 ps precision was achieved as compared to <700 ps for the GPS-based system). Unfortunately, the propagation delay through an optical fibre changes due to temperature variation. This is commonly compensated for by transferring the time information bi-directionally over a single optical fibre with subsequent cancellation of the propagation delay variations [1]. However, to avoid any signal degradation due to Rayleigh back-scattering and reflections at fibre connectors, it would be advantageous to transmit the information in both directions using different wavelength, each of them in a unidirectional sense [2]. However, this requires two transmitters operating at different wavelengths. Due to the limited stability of (low-cost) telecom-grade transmitters (generally ±0.1nm [3]), the propagation delay in both directions can change in an uncorrelated manner and thus could not be compensated by a known stable difference, degrading the precision of the time transfer.

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More information

Accepted/In Press date: 13 March 2015
Published date: 24 June 2015
Venue - Dates: CLEO Europe, Germany, 2015-06-21 - 2015-06-25
Organisations: Optoelectronics Research Centre

Identifiers

Local EPrints ID: 378771
URI: https://eprints.soton.ac.uk/id/eprint/378771
PURE UUID: d228c373-51ce-4890-8105-70214cb22617
ORCID for Radan Slavík: ORCID iD orcid.org/0000-0002-9336-4262

Catalogue record

Date deposited: 18 Jul 2015 16:35
Last modified: 06 Jun 2018 12:35

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