Effect of sinusoidal ripple in refractive index distribution on total dispersion in single mode parabolic-index fibers
TL;DR: In this paper, the total dispersion in single mode parabolic-index fibers is computed from the exact numerical solution of the scalar wave equation in the presence and absence of ripples in refractive index profile.
About: This article is published in Optics Communications.The article was published on 1984-02-15. It has received 9 citations till now. The article focuses on the topics: Step-index profile & Zero-dispersion wavelength.
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TL;DR: In this article, a simple analytical formula has been proposed to compute the vector propagation constant of single-mode graded-index fibers utilizing single parameter and two-parameter variational approximations for the LP 01 mode.
Abstract: A simple analytical formula has been proposed to compute the vector propagation constant of single-mode graded-index fibers utilizing single parameter and two-parameter variational approximations for the LP 01 mode. These approximations have also been utilized to study the effect of on-axis dip in the refractive index profile on the propagation characteristic of the fiber.
20 citations
TL;DR: In this paper, the normalized cutoff frequencies of the linearly polarized (LP) modes of a graded-index few mode fiber have been calculated as a function of profile shape parameters using a simple numerical method.
Abstract: The normalized cutoff frequencies of the linearly polarized (LP) modes of a graded-index few mode fiber have been calculated as a function of profile shape parameters using a simple numerical method. The effect of refractive-index dip on these cutoff frequencies and on the order of appearance of these modes has been investigated. The presence of dip causes an increase in the cutoff V values of all the modes, and the maximum shift in the cutoff V value is found to be even 20% for some modes. The order of appearance of some modes also gets drastically affected.
9 citations
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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.
5 citations
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.
2 citations
TL;DR: In this paper, a simple numerical method has been proposed to compute dispersion for single-mode graded-index fibers with power law profile and the results obtained are in excellent agreement with those obtained by more complicated methods proposed earlier.
Abstract: A simple numerical method has been proposed to compute dispersion for single-mode graded-index fibers with power law profile The results so obtained are in excellent agreement with those obtained by more complicated methods proposed earlier It has been shown that there two core radii exist at which dispersion becomes zero With this method the effect of on-axis dip on these two zero-dispersion core radii have been investigated A recently proposed single-parameter variational approximation for the LP01 mode has also been utilized to study these effects The results obtained by the variational method are in excellent agreement with those obtained from the proposed numerical method © 2002 Wiley Periodicals, Inc Microwave Opt Technol Lett 35: 27–33, 2002; Published online in Wiley InterScience (wwwintersciencewileycom) DOI 101002/mop10507
1 citations
References
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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
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: This paper describes a method for calculating the impulse response and bandwidth of multimode optical fibers from measured refractive-index profiles obtained either from the fiber itself or from its preform, based on the WKB solution of the guided-mode problem.
Abstract: This paper describes a method for calculating the impulse response and bandwidth of multimode optical fibers from measured refractive-index profiles obtained either from the fiber itself or from its preform. The computational method is based on the WKB solution of the guided-mode problem. First, the pulse delay time of each mode is calculated. The different arrival times of impulses carried by the modes are then used to construct the shape of the impulse response curve whose Fourier transform may be used to predict the signal bandwidth of the multimode fiber. By omitting mode groups or weighting the power distribution among the modes, the influence of certain mode groups on pulse distortion can be studied separately. Dispersion of the host material and of one dopant can be taken into account. The method has been used to study the effects of deviations from the desired perfect index profile and the influence of a central dip. The practical value of the computer program is its ability to predict fiber performance from index measurements made on preforms even before the fiber is drawn.
109 citations
TL;DR: The excess pulse broadening caused by deviations from the optimal index profile is analyzed for multimode optical fibers and the type and degree of index profile control required to keep the pulses broadening below a specified level is indicated.
Abstract: The excess pulse broadening caused by deviations from the optimal index profile is analyzed for multimode optical fibers. First-order perturbation theory is used to evaluate the effects of arbitrary index perturbations having longitudinal spatial frequencies which are too low to cause mode coupling. A simplified expression is found for the excess pulse broadening in terms of a double integral over a weighting function. Weighting functions are evaluated and used to calculate the effects of two kinds of circularly symmetric perturbations, a Gaussian-shaped bump or dip in the index profile and an oscillating perturbation. These perturbations are found to affect the pulse broadening significantly according to the position and width of the bump and the transverse spatial frequency of the oscillating perturbation. The more narrow bumps and those located at larger core radii are found to have the greatest effect. For a typical multimode fiber, perturbations making 2–18 oscillations along the radius are found to cause significant increases in pulse broadening, while more rapid oscillations are found to have negligible effect. These results indicate the type and degree of index profile control required to keep the pulse broadening below a specified level.
73 citations
TL;DR: In this article, a numerical solution to the Maxwell's equations is proposed to calculate the parameters necessary to design and fabricate single-mode lightguides, including the optimum core radius and profile parameter.
Abstract: By means of a numerical solution to Maxwell's equations, we calculate those parameters necessary to design and fabricate single-mode lightguides. These include optimum core radius and profile parameter α. In the design the dispersion is minimized by varying the core radius while the relative index difference Δ, the wavelength λ and profile parameter are held fixed. A comparison of calculated dispersion with experimental data shows excellent agreement
59 citations