Optimization of modulation techniques for suppression of GEMRS in frequency transfer systems

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Optimization_of_modulation_techniques.pdf (282.19 KB)

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https://ieeexplore.ieee.org/document/6859985

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https://doi.org/10.1109/FCS.2014.6859985
 http://hdl.handle.net/11603/38835

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UMBC Faculty Collection
UMBC Computer Science and Electrical Engineering Department
UMBC Student Collection

Author/Creator

Author/Creator ORCID

https://orcid.org/0000-0003-0269-8433

Date

2014-05

Type of Work

conference papers and proceedings
Text

Department

Program

Citation of Original Publication

Cahill, James P., Olukayode Okusaga, Weimin Zhou, Curtis R. Menyuk, and Gary M. Carter. “Optimization of Modulation Techniques for Suppression of GEMRS in Frequency Transfer Systems.” In 2014 IEEE International Frequency Control Symposium (FCS), 1–3, 2014. https://doi.org/10.1109/FCS.2014.6859985.

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This work was written as part of one of the author's official duties as an Employee of the United States Government and is therefore a work of the United States Government. In accordance with 17 U.S.C. 105, no copyright protection is available for such works under U.S. Law.
Public Domain

Subjects

frequency transfer
Rayleigh scattering
RF-photonic links
UMBC Computational Photonics Laboratory
UMBC Optical Fiber Communications Laboratory
UMBC High Performance Computing Facility (HPCF)
UMBC High Performance Computing Facility (HPCF)
Bandwidth
Phase modulation
UMBC Optical Fiber Communications Laboratory
Laser noise
Frequency modulation
Optical fibers

Abstract

Guided entropy mode Rayleigh scattering in optical fibers has been shown to have detrimental effects in optical fiber links for radio frequency transfer, optoelectronic oscillators (OEOs), and broadband analog optical fiber links. We have previously shown that GEMRS-induced noise can be suppressed via sinusoidal dithering of the laser drive current. Previously, we had hypothesized that this suppression is due to the laser frequency modulation it induces. In this work, we show for the first time GEMRS suppression via external phase modulation, thereby confirming that suppression is achieved via the frequency modulation component of the laser current dither. This result provides further evidence that GEMRS is a laser-driven, phase-dependent effect. Additionally, external modulation offers several advantages over the previously demonstrated intra-cavity modulation, including greater bandwidth and improved flexibility in implementation.