Effect of lower and upper parabolic dips in refractive index profile on performance of coaxial fiber Raman gain amplifier

Anup Karak; Sanchita Pramanik; Somenath Sarkar

doi:10.1117/1.OE.55.3.036103

8 March 2016 Effect of lower and upper parabolic dips in refractive index profile on performance of coaxial fiber Raman gain amplifier

Anup Karak, Sanchita Pramanik, Somenath Sarkar

Author Affiliations +

Optical Engineering, Vol. 55, Issue 3, 036103 (March 2016). https://doi.org/10.1117/1.OE.55.3.036103

Abstract

An investigation on the effect of practically possible upper and lower parabolic dips in the refractive index profile of the inner core of the coaxial fiber Raman gain amplifier is reported using matrix method for single pump. It is seen that for lower parabolic dip, the tolerable limits of dip parameters correspond to dip depth of 0.25% and dip width of 25% of the respective parameters for ideal step index profile case and agree with the earlier predicted linear dip. However, for upper parabolic dip, one gets higher gain and better flatness at these limits. Even up to 1% of the dip depth for 25% of dip width or 75% of dip width for 0.25% of the dip depth or 0.5% of dip depth and 50% of dip width, one can expect performance as good as that of the ideal one. However, since system designers will be aimed to produce ideal profile, our recommendation is to keep tolerable limits within 0.25% of dip depth and 25% of dip width of respective parameters. But one can accept profile with upper parabolic dip if there is deviation within the above relaxation limits for such dip.

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Anup Karak, Sanchita Pramanik, and Somenath Sarkar "Effect of lower and upper parabolic dips in refractive index profile on performance of coaxial fiber Raman gain amplifier," Optical Engineering 55(3), 036103 (8 March 2016). https://doi.org/10.1117/1.OE.55.3.036103

Published: 8 March 2016

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KEYWORDS

Laser phosphor displays

Raman spectroscopy

Raman scattering

Refractive index

Fiber amplifiers

Structured optical fibers

Tolerancing

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