Lasers, Fiber Optics, and Communications

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

[+] Author Affiliations
Anup Karak, Somenath Sarkar

University of Calcutta, Department of Electronic Science, 92 A. P. C Road, Kolkata 700009, West Bengal, India

University of Calcutta, Centre for Research in Nanoscience and Nanotechnology, JD-2, Sector-III, Salt Lake, Kolkata 700 098, West Bengal, India

Sanchita Pramanik

University of Calcutta, Department of Electronic Science, 92 A. P. C Road, Kolkata 700009, West Bengal, India

Vidyasagar University, Department of Electronics, Midnapore 721-102, West Bengal, India

Opt. Eng. 55(3), 036103 (Mar 08, 2016). doi:10.1117/1.OE.55.3.036103
History: Received January 6, 2016; Accepted February 17, 2016
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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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© 2016 Society of Photo-Optical Instrumentation Engineers

Citation

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", Opt. Eng. 55(3), 036103 (Mar 08, 2016). ; http://dx.doi.org/10.1117/1.OE.55.3.036103


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