Question

How to realize Raman Gain Spectrum Conversion of Optical Fibers

Recently I read a paper about the effect of Stimulated Raman scattering on parametric amplification based on the four-wave mixing.
When the pump wavelength (about 1542nm) is close to the zero dispersion wavelength (ZDW) e.g. 1540nm for a specific fiber, parametric amplification occur easily, so we cannot measure the Raman gain directly in this region.
In the paper, the experimenter measured the Raman gain spectrum at the wavelength of 1580nm, 60nm away from the ZDW, then convert the Raman gain spectrum of 1580nm to that of 1550nm using the relevent parameters of the two experiments, such as pump wavelength, pump power and fiber length.
How could they realize the conversion?
Besides, what parameters are the Raman gain coefficient related to, such as pump wavelength,pump power and fiber length or others? Is there an expression to show the relationship between the coefficient and these parameters?
Could anyone could help me? Thank you very much!

The URL link of the paper: http://www.opticsinfobase.org/jlt/abstract.cfm?URI=jlt-19-7-977
Jul 4, 2012

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All Answers (2)

  • Nour Nasser · Institut Franche-Comté Electronique Mécanique Thermique et Optique Sciences et Technologies
    Hello,
    I think it is useful to see this article,
    Regards,
    On the roles of polarization and Raman-assisted phase matching in narrowband fiber parametric amplifiers.
    J. Lightwave Technol., 26(14) :2260–2268, Jul 2008.
    Jul 4, 2012
  • Meng Yan · Huazhong University of Science and Technology
    Thank youn for your kindly recommendation, Nour! I will refer to the paper for some help!
    Jul 6, 2012

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