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Journal of the Optical Society of America B

Journal of the Optical Society of America B


  • Editor: G. I. Stegeman
  • Vol. 23, Iss. 12 — Dec. 1, 2006
  • pp: 2479–2485

Relative intensity noise transfer of large-bandwidth pump lasers in Raman fiber amplifiers

Kafing Keita, Philippe Delaye, Robert Frey, and Gérald Roosen  »View Author Affiliations

JOSA B, Vol. 23, Issue 12, pp. 2479-2485 (2006)

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A theoretical analysis of the Raman amplification in optical fibers and the pump-to-signal relative intensity noise (RIN) transfer has been performed in the spectral domain. An efficient Raman amplification of a monochromatic signal beam by a large-bandwidth pump beam has been demonstrated for a pump bandwidth much smaller than the Raman linewidth. Under the same approximation the pump-to-signal RIN transfer has been calculated in both cases of copropagating and counterpropagating beams in the two limiting cases of modulated monochromatic and smooth-profile large-bandwidth pump beams. At low frequencies the excess of noise evidenced in the case of a modulated monochromatic pump beam did not exist in the case of large-bandwidth pseudoincoherent sources. As this noise reduction can be as large as 13 dB for a 40 dB net gain of the amplifier, such incoherent pumping sources must be considered for the purpose of low-noise Raman amplifiers.

© 2006 Optical Society of America

OCIS Codes
(060.2320) Fiber optics and optical communications : Fiber optics amplifiers and oscillators
(060.4370) Fiber optics and optical communications : Nonlinear optics, fibers
(070.4340) Fourier optics and signal processing : Nonlinear optical signal processing
(190.5650) Nonlinear optics : Raman effect

ToC Category:
Fiber Optics and Optical Communications

Original Manuscript: March 7, 2006
Manuscript Accepted: July 27, 2006

Kafing Keita, Philippe Delaye, Robert Frey, and Gérald Roosen, "Relative intensity noise transfer of large-bandwidth pump lasers in Raman fiber amplifiers," J. Opt. Soc. Am. B 23, 2479-2485 (2006)

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