Effect of lower and upper parabolic dips in refractive index profile on performance of coaxial fiber Raman gain amplifier
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"Effect of lower and upper parabolic..." refers background in this paper
...Again, for LP02 mode, the effective refractive index variation is close to that of the outer core below PMW and it is nearest to the inner core above PMW....
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...This particular wavelength in the operating wavelength region is known as PMW.3,6 In this fiber structure, the effective refractive index variation of LP01 mode is below PMW, such that it is close to the effective refractive index variation of the individual inner core....
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...Thus, in view of the above considerations from Tables 1 and 2, we see that in the LD case,5 dip parameters considered for all the dip profiles are for d ¼ 0.25 μm and q ¼ 0.0025 for calculation of FRGA performance and dispersion coefficient with respect to nominal effect on PMW....
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...This particular wavelength in the operating wavelength region is known as PMW.(3,6) In this fiber structure, the effective refractive index variation of LP01 mode is below PMW, such that it is close to the effective refractive index variation of the individual inner core....
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