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Mode-locked lasers for remote intercomparison of frequency standards over optical fibre networks.

Christodoulia, N; Lea, S N; Marra, G; Margolis, H S; Gill, P; Leburn, C G*; Fusari, F*; Brown, C T A* (2007) Mode-locked lasers for remote intercomparison of frequency standards over optical fibre networks. In: OFMC 2007, 15-17 October 2007, NPL, UK.

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Abstract

Optical frequency standards based on trapped ions and cold atoms are reaching the point at which they are becoming competitive with caesium primary frequency standards from the point of view of accuracy and exceeding them in terms of stability. Comparison of the optical frequency standards developed at various NMIs currently depends on femtosecond comb measurements of their frequency relative to caesium or H-maser microwave standards, together with satellite time-transfer to relate the latter. Although optical frequency standards can reach a stability of 1 x 10-15 at a few hours, the best satellite time-transfer requires around 20 days to reach the same level. Transfer of either a microwave or optical frequency via optical fibre offers the potential to greatly improve on this performance but is only economically feasible if it can be performed using already-installed optical fibre networks.
Here we report on tests of the added noise in the transmission of optical and microwave frequencies over an in-house testbed using cw and mode-locked lasers

Item Type: Conference or Workshop Item (UNSPECIFIED)
Keywords: optical frequency standards, optical fibre networks, frequency dissemination
Subjects: Time and Frequency
Time and Frequency > Optical Frequency Standards and Metrology
Last Modified: 02 Feb 2018 13:15
URI: http://eprintspublications.npl.co.uk/id/eprint/3973

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