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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 10 — May. 20, 2013
  • pp: 12038–12052

Investigations of single-frequency Raman fiber amplifiers operating at 1178 nm

Iyad Dajani, Christopher Vergien, Craig Robin, and Benjamin Ward  »View Author Affiliations


Optics Express, Vol. 21, Issue 10, pp. 12038-12052 (2013)
http://dx.doi.org/10.1364/OE.21.012038


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Abstract

We report on core-pumped single-stage and two-stage polarization-maintaining single-frequency Raman fiber amplifiers (RFAs). For a counter-pumped single-stage RFA, commercial-off-the shelf (COTS) single-mode fiber was utilized to generate 10 W of output power at 1178 nm through the application of a two-step thermal gradient in order to suppress SBS. The relatively high output can be explained by the Brillouin gain spectrum (BGS) of the COTS fiber. A pump-probe characterization of the BGS of the fiber provided a Brillouin gain coefficient of 1.2 × 10−11 m/W with a FWHM of 78 MHz for the gain bandwidth. A fiber cutback study was also conducted to investigate the signal output at SBS threshold as a function of pump power for optimal length. This study revealed a linear dependence, which is in agreement with the theoretical prediction. Furthermore, we present numerical simulations indicating that substantial power scaling can be achieved by seeding at a higher power. Consequently, we constructed a two-stage RFA in order to achieve seed powers at the 1 W level. By utilizing an acoustically tailored fiber possessing a lower Brillouin gain coefficient than the COTS fiber and by seeding at higher powers, 22 W of single-frequency 1178 nm output was obtained from a counter-pumped two-stage RFA. Finally, we show that the single-frequency spectral bandwidth could not be maintained when a similar co-pumped two-stage RFA was utilized.

© 2013 OSA

OCIS Codes
(140.3550) Lasers and laser optics : Lasers, Raman
(290.5900) Scattering : Scattering, stimulated Brillouin
(290.5910) Scattering : Scattering, stimulated Raman

ToC Category:
Lasers and Laser Optics

History
Original Manuscript: February 28, 2013
Revised Manuscript: April 18, 2013
Manuscript Accepted: April 22, 2013
Published: May 10, 2013

Citation
Iyad Dajani, Christopher Vergien, Craig Robin, and Benjamin Ward, "Investigations of single-frequency Raman fiber amplifiers operating at 1178 nm," Opt. Express 21, 12038-12052 (2013)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-21-10-12038


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