Open AccessPractical and cost-effective high-fidelity optical carrier dissemination using coherent communication techniques
Author(s) -
Ehsan Sooudi,
J. O’Gorman,
P. Gunning,
A.D. Ellis,
Fatima C. Garcia Gunning,
Robert Manning
Publication year - 2015
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.23.021678
Subject(s) - phase shift keying , laser linewidth , optics , phase noise , optical communication , physics , transmitter , telecommunications , carrier recovery , laser , computer science , optoelectronics , bit error rate , carrier signal , transmission (telecommunications) , channel (broadcasting)
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.