Practical and cost-effective high-fidelity optical carrier dissemination using coherent communication techniques

Ehsan Sooudi, James O'Gorman, Paul Gunning, Andrew D. Ellis, Fatima C. Garcia Gunning, Robert J. Manning

Research output: Contribution to journalArticle

Abstract

We report a unidirectional frequency dissemination scheme for high-fidelity optical carriers deployable over telecommunication networks. For the first time, a 10 Gb/s Binary Phase Shift Keying (BPSK) signal from an ultra-narrow linewidth laser was transmitted through a field-installed optical fibre with round-trip length of 124 km between Cork City and town of Clonakilty, without inline optical amplification. At the receiver, using coherent communication techniques and optical injection-locking the carrier was recovered with noise suppression. The beat signal between the original carrier at the transmitter and recovered carrier at the receiver shows a linewidth of 2.8 kHz. Long term stability measurements revealed fractional instabilities (True Allan deviation) of 3.3 × 10-14 for 1 s averaging time, prior to phase noise cancellation.

Original languageEnglish
Pages (from-to)21678-21689
Number of pages12
JournalOptics Express
Volume23
Issue number17
DOIs
Publication statusPublished - 11 Aug 2015

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