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Journal ArticleDOI

Effect of dip in refractive index profile on fiber Raman gain amplifier performance

15 Oct 2014-Optics Communications (North-Holland)-Vol. 329, pp 145-150
TL;DR: In this paper, the effect of linear dip in the inner core of a coaxial fiber Raman gain amplifier having step index inner and outer cores in the structure on the amplifier performance was studied and reported.
About: This article is published in Optics Communications.The article was published on 2014-10-15. It has received 5 citations till now. The article focuses on the topics: Refractive index profile & Amplifier.
Citations
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Journal ArticleDOI
TL;DR: In this paper, a simple and accurate theoretical investigation is presented, based on a novel, effective, and straight-forward ABCD matrix technique, in relation to estimation of optimum coupling efficiency between the laser diode and the photonic crystal fiber (PCF) with a hyperbolic microlens (HML) on its tip.
Abstract: A simple and accurate theoretical investigation is presented, based on a novel, effective, and straight- forward ABCD matrix technique, in relation to estimation of optimum coupling efficiency between the laser diode and the photonic crystal fiber (PCF) with a hyperbolic microlens (HML) on its tip. By tailoring different parameters, such as the air-filling factor and lattice constant of the PCF, the criteria for achieving maximum coupling are predicted and reported for two different light wavelengths of practical interest. It is observed that such fiber parameters play a crucial role in predicting the optimum focal length of HML for a particular wavelength. The formulation should find application in the design of HML, for achieving a long working distance between the laser source facet and the fiber tip. © 2015 Society of Photo-Optical Instrumentation Engineers (SPIE) (DOI: 10.1117/1.OE.54.8 .086102)

11 citations

Journal ArticleDOI
TL;DR: In this paper, a premier report based on coupledmode analysis (CMA) is presented to analyze and predict the performance of fiber Raman gain amplifier (FRGA) for the first time, as per our knowledge, using coaxial structure consisting of step-index profiles in both inner and outer cores in terms of effective area.
Abstract: The propagation characteristics of doped fiber amplifier have, already, been analyzed using simple coupled-mode analysis (CMA), which steers the interests to apply this simple theory to study the amplification performance of fiber Raman gain amplifier (FRGA) But such study is yet to be done for FRGA In this paper, a premier report based on CMA is presented to analyze and predict the performance of FRGA for first time, as per our knowledge, using coaxial structure consisting of step-index profiles in both inner and outer cores in terms of effective area, Raman gain coefficient, and effective Raman gain coefficient In our investigation, we use single pump to compute and compare our results with the results obtained by involved matrix method and a fairly excellent match over a wide region of frequency shift is reported

3 citations

Journal ArticleDOI
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.
Journal ArticleDOI
TL;DR: In this paper, a hybrid combination of Raman Amplifier and Erbium Doped Fiber Amplifier (EDFA) with Dispersion Compensation at C and S bands, recycling of pump power and location of EDFA was investigated.
Abstract: Raman Amplifier (RA) is the fiber amplifier that follows Stimulated Raman Scattering (SRS) mechanism. For broadband amplification it is used, because of low noise and better gain. Raman amplification was investigated in multiple views. Many research works had focused in the views of pumping schemes, gain flattening, transmission system and noise analysis. In this paper, Raman amplification is studied in the views of varying Refractive Index profile of core, varying core gap radius, hybrid combination of RA with Erbium Doped Fiber Amplifier (EDFA). This paper also studies the investigations of this hybrid combination in Dispersion compensation at C and S bands, recycling of pump power and location of EDFA.

Cites background from "Effect of dip in refractive index p..."

  • ...During the design of RA, step index profile at both inner and outer cores was considered in another research (Pramanik & Sarkar, 2014)....

    [...]

Proceedings ArticleDOI
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.

Cites background from "Effect of dip in refractive index p..."

  • ...In this work, instead of analyzing dip [10] & [12], the new idea of elevating the refractive index at core axis is proposed....

    [...]

  • ...Even with dip and ripples in SI profiles, Raman Amplifier (RA) performed as fine as that of RA without any imperfection in RIP [10] & [12] and SI profiles in the inner core were the best choices for RA....

    [...]

References
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Book
01 Jan 2005
TL;DR: In this article, Stimulated Raman Scattering in Optical Fibers Raman Pumping in Optical Fiber Communications Distributed Raman amplification along the transmission span Discrete Raman amplifiers Impairments and Limitations to Raman Amplification.
Abstract: Introduction Stimulated Raman Scattering in Optical Fibers Raman Pumping in Optical Fiber Communications Distributed Raman amplification along the transmission span Discrete Raman amplifiers Impairments and Limitations to Raman Amplification.

296 citations

Journal ArticleDOI
TL;DR: In this paper, a novel dispersion compensating fiber design consisting of two highly asymmetric concentric cores was proposed, which can have very large negative dispersion values with larger mode field diameter.
Abstract: We propose a novel dispersion compensating fiber design consisting of two highly asymmetric concentric cores. We show that the fundamental mode of the proposed fiber can have very large negative dispersion values [/spl sim/-5100 ps/(nm.km)] with larger mode field diameter (/spl sim/8-9 /spl mu/m) relative to the existing dispersion compensating fibers.

166 citations

Journal ArticleDOI
TL;DR: In this paper, the seamless integration of an 8/spl times/2.5 Gb/s passive optical network and radio-over-fiber access system using all-optical up-conversion based on Raman-assisted four-wave mixing in a high-nonlinear fiber is demonstrated.
Abstract: We experimentally demonstrate the seamless integration of an 8/spl times/2.5 Gb/s wavelength-division-multiplexing passive optical network and radio-over-fiber access system using all-optical up-conversion based on Raman-assisted four-wave mixing in a high-nonlinear fiber. Dispersion-limited reach is extended to >20 km through vestigial-sideband filtering.

119 citations

Journal ArticleDOI
TL;DR: In this article, the authors present a technique for calculating the Raman gain spectra of germanosilicate fibers from their index profiles, which depend on radial profiles of the guided optical modes and the glass composition.
Abstract: In this letter, we present a technique for calculating the Raman gain spectra of germanosilicate fibers from their index profiles. The gain spectra depend on radial profiles of the guided optical modes and the glass composition, in particular the distribution of Si-O-Si and Ge-O-Si bridging bonds. We have obtained spectral coefficients, which represent the contributions from these bonds using Raman gain measurements made on a set of calibration fibers with well-characterized index profiles. We describe how these spectral coefficients can be used in the design of Raman gain fibers, and we demonstrate the accuracy of our technique over a broad range of fiber types.

103 citations

Journal ArticleDOI
TL;DR: The key novelty of this reconfigurable microwave frequency measurement technique is the employment of stimulated Brillouin scattering, which results in a tunable amplitude comparison function, leading to an adjustable measurement range and resolution.
Abstract: We present a reconfigurable microwave frequency measurement technique with adjustable measurement range and resolution. The key novelty of the technique is the employment of stimulated Brillouin scattering, which results in a tunable amplitude comparison function, leading to an adjustable measurement range and resolution. The proposed technique is switchable between a wideband tunable narrow measurement range (∼2 GHz) with high resolution (±0.05 GHz) and a fixed wide measurement range (12 GHz) with moderate resolution (±0.25 GHz).

80 citations