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Journal ArticleDOI

Detailed variational analysis of single mode trapezoidal index fiber involving two simple approximations of fundamental mode with comparison relating accurate prediction of propagation characteristics

26 Mar 2017-Journal of Modern Optics (Taylor & Francis)-Vol. 64, Iss: 6, pp 646-652
TL;DR: In this paper, a detailed variational analysis of single-mode trapezoidal index fiber to investigate its propagation characteristics involving two simple approximations of fundamental mode is presented, and it is shown in respect of computation of normalized field that the single parameter variational function having Gaussian and modified Bessel variations in the core and cladding, respectively, is more accurate in comparison with the Gaussian function over a wide range of values of normalized frequency and aspect ratio.
Abstract: A detailed variational analysis of single-mode trapezoidal index fibre to investigate its propagation characteristics involving two simple approximations of fundamental mode is presented. It is shown in respect of computation of normalized field that the single parameter variational function having Gaussian and modified Bessel variations in the core and cladding, respectively, is more accurate in comparison with the Gaussian function over a wide range of values of normalized frequency and aspect ratio. Also, it predicts the propagation characteristics, more accurately, than the Gaussian function from variational and recently reported Marcuse-type formulations. Further, in terms of such range of values, a complete formulation of variational parameter for the Gaussian-modified Bessel function is prescribed for ready reference to the system users to predict the modal field and propagation characteristics.
Citations
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Book ChapterDOI
29 Apr 2015
TL;DR: This chapter is a starting point to look around and see where you’re going before you dig into details, and put fiber optics and communications into context and show how they go together.
Abstract: This chapter is a starting point to look around and see where you’re going before you dig into details. The goal is to put fiber optics and communications into context and show how they go together. I start with a personal commentary about the turbulent times of the past several years, then explain the plan for this book. A brief history of fiber optics follows, which introduces some important concepts. Then a brief history of communications explains the need for bandwidth and how fiber optics filled that need, perhaps too well. Finally, I explain some of the terminology of the field to help you in your looking about.

159 citations

Journal ArticleDOI
TL;DR: In this article, the authors summarized the key technologies of a single mode fiber coupling to a laser diode and its direction of development in the future, and focused on optimizing the optical structure and the coupling parameters to improve the coupling efficiency and packaging performance.

16 citations

Journal ArticleDOI
01 Oct 2018-Optik
TL;DR: In this article, the authors use the splice loss measurement technique in absence and presence of angular misalignment and report a simple and accurate method to predict the unknown aspect ratio of a supplied circular core trapezoidal index single mode fiber.

3 citations

References
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Journal ArticleDOI
TL;DR: This paper presents a one-parameter analysis which involves computational effort comparable to that involved in the Gaussian approximation and yet gives much better results than other existing approximations for all values ofV for most graded-index fibres.
Abstract: In this paper, we present two approximations for the fundamental mode of graded-index fibres. The first is a one-parameter analysis which involves computational effort comparable to that involved in the Gaussian approximation and yet gives much better results. The second is a two-parameter analysis which gives much better results than other existing approximations for all values ofV for most graded-index fibres.

84 citations

Journal ArticleDOI
TL;DR: In this article, a novel large mode area photonic crystal fiber (PCF) is proposed, where the V-parameter and effective mode area can be improved by manipulating the cladding region rather than the core region itself.

53 citations

Journal ArticleDOI
TL;DR: Graded index porous fiber incorporating an air-holes array featuring variable air-hole diameters and inter-hole separations is proposed and experimentally demonstrates smaller pulse distortion, larger bandwidth and higher excitation efficiency compared to fibers with uniform porosity.
Abstract: A graded index porous optical fiber incorporating an air-hole array featuring variable air-hole diameters and inter-hole separations is proposed, fabricated, and characterized in a view of the fiber potential applications in low-loss, low-dispersion terahertz guidance. The proposed fiber features simultaneously low modal and intermodal dispersions, as well as low loss in the terahertz spectral range. We experimentally demonstrate that graded index porous fibers exhibit smaller pulse distortion, larger bandwidth, and higher excitation efficiency when compared to fibers with uniform porosity.

45 citations

Journal ArticleDOI
U. C. Paek1
TL;DR: The transmission performance of trapezoidal-index profile single-mode fibers that can operate with zero dispersion in the 1.5-microm region has been investigated and it was found that as the aspect ratio decreases the optimum core radius of the fiber gradually increases.
Abstract: The transmission performance of trapezoidal-index profile single-mode fibers that can operate with zero dispersion in the 1.5-microm region has been investigated. The exact numerical calculations of propagation characteristics for these lightguides established a variety of relationships in terms of the parameters of a trapezoidal-index profile. One of the profile parameters that defines the shape of a trapezoid is the aspect ratio S, which ranges between 0 and 1. It was found that as the aspect ratio decreases from 1.0 to 0.3 the optimum core radius of the fiber gradually increases. But when S is <0.3, it approaches a constant equal to the value of the triangular-index profile (S = 0).

44 citations

Journal ArticleDOI
TL;DR: In this paper, a single-mode photonic crystal fiber (PCF) with low chromatic dispersion, low bend, and rotational sensitivity is presented, and the transverse electric field vector distributions of the fundamental, higher order and fundamental space filling modes, their effective indices, chromatic disersion, confinement, bending, and rotation losses are reported using full vector finite element method (FEM).
Abstract: A single-mode photonic crystal fiber (PCF) with low chromatic dispersion, low bend, and rotational sensitivity is presented. The transverse electric field vector distributions of the fundamental, higher order and fundamental space filling modes, their effective indices, chromatic dispersion, confinement, bending and rotational losses are reported using full-vector finite-element method (FEM). In addition, the endlessly single mode behavior is demonstrated by employing the V parameter of the proposed PCF. It has also been shown that the proposed PCF design is insensitive to bends and rotations.

35 citations