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Optics Letters

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  • Editor: Alan E. Willner
  • Vol. 34, Iss. 22 — Nov. 15, 2009
  • pp: 3574–3576

All-fiber coherent combining of Er-doped amplifiers through refractive index control in Yb-doped fibers

Andrei A. Fotiadi, Nikita Zakharov, Oleg L. Antipov, and Patrice Mégret  »View Author Affiliations


Optics Letters, Vol. 34, Issue 22, pp. 3574-3576 (2009)
http://dx.doi.org/10.1364/OL.34.003574


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Abstract

We propose a simple all-fiber solution for coherent beam combining of Er-doped fiber amplifiers. This method, which we believe to be a new method, employs the effect of refractive index changes in Yb-doped fibers induced at 1.55 μ m by optical pumping at 980   nm , which is performed for an active phase control in the fiber configuration. An algorithm based on population inversion in a two-level system supports the straightforward implementation of the effect into a feedback loop. Combining two 500 mW Er-doped amplifiers in a single-mode fiber is successfully demonstrated with control by 120   mW laser diode. The method is shown to operate against the acoustic phase noise within the range of π   rad and with a rate of 2.6 π   rad / ms that potentially serves combining of at least 50 amplifiers similar to those used in practical work.

© 2009 Optical Society of America

OCIS Codes
(060.2320) Fiber optics and optical communications : Fiber optics amplifiers and oscillators
(140.3510) Lasers and laser optics : Lasers, fiber
(140.3298) Lasers and laser optics : Laser beam combining

ToC Category:
Lasers and Laser Optics

History
Original Manuscript: August 18, 2009
Revised Manuscript: October 15, 2009
Manuscript Accepted: October 15, 2009
Published: November 12, 2009

Citation
Andrei A. Fotiadi, Nikita Zakharov, Oleg L. Antipov, and Patrice Mégret, "All-fiber coherent combining of Er-doped amplifiers through refractive index control in Yb-doped fibers," Opt. Lett. 34, 3574-3576 (2009)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-34-22-3574


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