Abstract

We propose a simple technique to optimize a multi-wavelength backward-pumped fiber Raman amplifier. Based on the geometric characteristics of Raman gain profile, we approximate it using several straight lines and utilize slope compensation technique to achieve flat and wideband gain profile. Good simulation results are obtained.

© 2004 Optical Society of America

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References

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  1. X Zhou, C Lu, et al, �??A simple model and optimal design of a multi-wavelength backward-pumped fiber Raman amplifier,�?? IEEE Photon. Technol. Lett. 13, 945-947 (2001).
    [CrossRef]
  2. V. E. Perlin, H. G. Winful, �??Optimal design of flat-gain wide-band fiber Raman amplifiers,�?? IEEE J. Lightwave Technol. 20, 250-254 (2002).
    [CrossRef]
  3. Howard Kidorf, Karsten Rottitt, et al, �??Pump interaction in a 100-nm bandwidth Raman amplifier,�?? IEEE Photon. Technol. Lett. 11, 530-533 (1999).
    [CrossRef]

IEEE J. Lightwave Technol.

V. E. Perlin, H. G. Winful, �??Optimal design of flat-gain wide-band fiber Raman amplifiers,�?? IEEE J. Lightwave Technol. 20, 250-254 (2002).
[CrossRef]

IEEE Photon. Technol. Lett.

Howard Kidorf, Karsten Rottitt, et al, �??Pump interaction in a 100-nm bandwidth Raman amplifier,�?? IEEE Photon. Technol. Lett. 11, 530-533 (1999).
[CrossRef]

X Zhou, C Lu, et al, �??A simple model and optimal design of a multi-wavelength backward-pumped fiber Raman amplifier,�?? IEEE Photon. Technol. Lett. 13, 945-947 (2001).
[CrossRef]

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Figures (4)

Fig. 1.
Fig. 1.

Asymptotic linear approximation of a typical Raman gain spectrum gR(Δυ) of a silica fiber at pump wavelength λ0=1µm

Fig. 2.
Fig. 2.

Schematic diagram of the geometric compensation scheme (i=2,3,4), with wavelength independent loss considered. S1, S2 and S3 show the partial gain spectral; Δf shows the target amplification band; υa1,1, υa21, υa31 and υa32 related to frequency allocation of gain spectra from individual pumps

Fig. 3.
Fig. 3.

Schematic diagram of the geometric compensation scheme (i=2,3,4), with wavelength dependent loss considered. Triangle: wavelength dependent loss of the fiber; Circle: individual gain spectral

Fig. 4.
Fig. 4.

example of a C-band Raman amplifier design

Equations (7)

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G k = 10 ln ( 10 ) ( α k L + j = n + 1 j k n + m g jk I j + j = 1 n g jk I j )
k = n + 1 , n + 2 , n + m ; j = 1 , 2 , n
I 1 = G 10 log ( e ) + α L g ( ν a 1 , 2 )
I j = I 1 ( g ( ν a 1 , j + 1 ) g ( ν a 1 , j + 2 ) ) ν a 1 , j + 1 ν a 1 , j + 2 ν a j , 1 ν a j , 2 g ( ν a j , 1 ) g ( ν a j , 2 )
j = 2 n
I j = I 1 ( g ( ν a 1 , j + 1 ) g ( ν a 1 , j + 2 ) ) ( α ( ν a 1 , j + 1 ) α ( ν a 1 , j + 2 ) ) ν a 1 , j + 1 ν a 1 , j + 2 ν a j , 1 ν a j , 2 g ( ν a j , 1 ) g ( ν a j , 2 )
j = 2 n

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