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Appl. Sci. 2015, 5(2), 77-87; doi:10.3390/app5020077

Excess Phase Noise Characterization in Multifrequency Remote Clock Distribution Based on Femtosecond Frequency Combs

1
Department of Physics, University of Alabama in Huntsville, Huntsville, AL 35899, USA
2
Research Institute of Telecommunications Transmission, Beijing 100191 China
3
Department of Electrical and Computer Engineering, University of South Alabama, Mobile, AL 36688, USA
These authors contributed equally to this work.
*
Author to whom correspondence should be addressed.
Academic Editor: Takayoshi Kobayashi
Received: 7 March 2015 / Revised: 27 April 2015 / Accepted: 28 April 2015 / Published: 7 May 2015
(This article belongs to the Special Issue Feature Papers)
View Full-Text   |   Download PDF [1067 KB, uploaded 7 May 2015]   |  

Abstract

Remote distribution of optical frequency references, based on multifrequency sources such as femtosecond frequency combs, holds many advantages over its single-frequency counterpart. However, characterizing the excess noise caused by the transmission links or external perturbations in a multifrequency scheme posts new challenges. We have experimentally demonstrated direct measurement of excess phase noise spectrum in both free-space and fiber-optic transfer of a frequency comb using a multiheterodyne technique. In fiber-optic distribution, we focused on the excess phase noise under a single-tone acoustic perturbation. Increased overall noise power and a change of phase noise spectrum have been observed. In free-space distribution, a fractional instability of 3 × 10−14 at 1 s was observed for a 60 m outdoor atmospheric transmission, and large phase modulation due to air fluctuations causes a sizable line broadening. View Full-Text
Keywords: clock distribution; optical frequency comb; multiheterodyne; phase noise; fiber optics; free-space communication clock distribution; optical frequency comb; multiheterodyne; phase noise; fiber optics; free-space communication
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Hu, C.; Gollapalli, R.P.; Yang, L.; Duan, L. Excess Phase Noise Characterization in Multifrequency Remote Clock Distribution Based on Femtosecond Frequency Combs. Appl. Sci. 2015, 5, 77-87.

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