Effect of sinusoidal ripples in refractive index profile distribution on the performance characteristics of dual concentric core step index fiber Raman amplifier
TL;DR: In this article, the effect of ripple amplitude up to 5% of core cladding refractive index difference w.r.t. was investigated in dual cores of single mode fiber Raman amplifier for the first time.
About: This article is published in Optik.The article was published on 2014-07-01. It has received 2 citations till now. The article focuses on the topics: Refractive index profile & Step-index profile.
Citations
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TL;DR: In this paper, 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.
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.
Cites background from "Effect of sinusoidal ripples in ref..."
...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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11 Apr 2019
TL;DR: In this article, an idea of slightly elevating the refractive index at the core axis was proposed to deal with the performance of multimode step index (MSI) fiber at the bit rate of 40Gbps.
Abstract: This paper deals with the performance of Multimode Step Index (MSI) fiber at the bit rate of 40Gbps. A $50 \mu \mathrm{m}$ MSI fiber is designed with the profile of inner core, outer core and the cladding. Instead of analyzing the dip in refractive index at core axis, this paper proposes an idea of slightly elevating the refractive index at core axis. This is simulated by Optifiber software at the wavelength of 1550nm. The dispersion and bend forbearance of designed MSI fiber is analyzed by varying the index difference between core and cladding. Elevated Refractive Index Profile (RIP) with cladding index n clad of 1.40871 provides improved tolerance of macro bending losses at 1550nm and Elevated Refractive Index Profile (RIP) with cladding index n clad of 1.{44871 provides reduced dispersion at 1550nm.The MSI fiber with these Elevated RIPs are applied at the optical communication link at bit rate of 40 Gbps and is simulated using Optisystem simulation software.
References
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TL;DR: Simple formulas and functions for the fiber parameters are presented as a help for practical design work that considers the propagation constant, mode delay, the cladding field depth, and the power distribution in the fiber cross section.
Abstract: Thin glass fibers imbedded into a glass cladding of slightly lower refractive index represent a promising medium for optical communication. This article presents simple formulas and functions for the fiber parameters as a help for practical design work. It considers the propagation constant, mode delay, the cladding field depth, and the power distribution in the fiber cross section. Plots vs frequency of these parameters are given for 70 modes
1,506 citations
Book•
01 Jan 1972
TL;DR: Light transmission optics, light transmission optics as discussed by the authors, Light transmission optics, مرکز فناوری اطلاعات, ا�ل-اع رسانی,
Abstract: Light transmission optics , Light transmission optics , مرکز فناوری اطلاعات و اطلاع رسانی کشاورزی
1,231 citations
Book•
01 Dec 2007TL;DR: In this article, the authors present a detailed analysis of planar optical waveguide and a step-index fiber model for optical fiber communication and demonstrate the properties of a step index fiber.
Abstract: 1. Introduction 2. Basic optics 3. The optical fiber 4. Ray analysis of planar optical waveguide 5. Graded index optical fibers 6. Material dispersion 7. Planar waveguides 8. Characteristics of a step-index fiber 9. Graded Index fibers 10. Waveguide dispersion and design considerations 11. Sources for optical fiber communication 12. Detectors for optical fiber and communication 13. Fiber optic communication system design 14. Optical fiber Amplifiers 15. Dispersion compensation and chirping phenomenon 16. Optical solitons 17. Single-mode fiber optic components 18. Single mode optical fiber sensors 19. Measurement methods in optical fiber: I 20. Measurement methods in optical fibers: II 21. Periodic interactions in waveguides 22. Ray equation in Cartesian coordinates 23. Ray paths 24. Leaky modes.
843 citations
TL;DR: In this article, a very low loss singlemode fiber with a minimum loss of 0.20 dB/km at a wavelength of 1.55 μm is attained; this loss reaches the ultimate lower loss limit of silica-based optical glass fibre.
Abstract: A very low loss single-mode fibre with a minimum loss of 0.20 dB/km at a wavelength of 1.55 μm is attained; this loss reaches the ultimate lower loss limit of silica-based optical glass fibre. The loss mechanism is also discussed.
644 citations
TL;DR: In this article, a scalar multilayer approximation method for calculating the impulse response of multimode optical fibers from measured refractive-index profiles is described, and a comparison is made between shapes of measured pulses and calculated pulses.
Abstract: A scalar multilayer approximation method for calculating the impulse response of multimode optical fibers from measured refractive-index profiles is described. A comparison is made between shapes of measured pulses and calculated pulses.
77 citations