Introduction to fiber optics

Ghatak, Ajoy; Thyagarajan, K.

doi:10.1017/cbo9781139174770

Cited by 619 publications

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“…Thus, non-paraxial solutions are required. Several schemes have been suggested for wide-angle beam propagation through guided-wave devices (Yevick and Glasner, 1990;Hadley, 1992;Yamauchi et al, 1996;Ilić et al, 1996;1999, Ho andLu, 2001;Lu and Ho, 2002;Lu and Wei, 2002;Luo and Law, 2002). Most methods for non-paraxial beam propagation discussed in the literature approach this problem iteratively, in which a numerical effort equivalent to solving the paraxial equation several times is involved.…”

Section: Introductionmentioning

confidence: 99%

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Non-paraxial Split-step Finite-difference Method for Beam Propagation

Sharma

Agrawal

2006

Opt Quant Electron

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This is the unspecified version of the paper.This version of the publication may differ from the final published version. Permanent AbstractA method based on symmetrized splitting of the propagation operator in the finite difference scheme for non-paraxial beam propagation is presented. The formulation allows the solution of the second order scalar wave equation without having to make the slowly varying envelope and one-way propagation approximations. The method is highly accurate and numerically efficient.Unlike most Padé approximant based methods, it is non-iterative in nature and requires less computation. The method can be used for bi-directional propagation as well.

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Section: Introductionmentioning

confidence: 99%

“…In these methods, the square root of the propagation operator involved in the wave equation is approximated in various ways. One of the approximations used is based on the Padé approximants (Yevick and Glasner, 1990;Hadley, 1992). Earlier, we proposed a new method .…”

Section: Introductionmentioning

confidence: 99%

Non-paraxial Split-step Finite-difference Method for Beam Propagation

Sharma

Agrawal

2006

Opt Quant Electron

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“…Through some logical considerations, the suitable refractive index profile holding the desired MFD is extracted. In the weakly guiding approximation, the transverse component of the electric field satisfies the scalar wave equation [6]:…”

Section: Mathematical Formulation and Design Proceduresmentioning

confidence: 99%

“…The next challenge is compatibility with the standard singlemode fibers (SMFs) installed in the telecommunication industry. This compatibility could be achieved by reducing splicing loss during splicing of bend insensitive fiber structures with the conventional SMF [6]. This is attained through adjustment of the MFD of the designed fiber to that of the standard conventional fiber.…”

Section: Introductionmentioning

confidence: 99%

Strain and Curvature Stability Enhanced SMF Introduction

Makouei

2017

AEM

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In this paper, the strain insensitive single-mode optical fiber with low nonlinear effects and ultra low bending loss (BL), appropriate for small curvature radius installation, is presented. The suggested design method is based on electrical field distribution Gaussian assumption in the core region which evaluates the refractive index profile considering proper mode field diameter (MFD) value. Then, so as to attain the enhanced bending loss and strain stability response for the optical fiber, the optimization tool of the evolutionary genetic algorithm (GA) is employed to determine the optical and geometrical parameters of the structure. In the first designed fiber, the calculations for BL, MFD, effective area (A eff ), and effective refractive index sensitivity to strain(dn eff /dε) in the well-known wavelength of 1.55 µm are 0.0018 dB per each turn of 5 mm curvature radius, 8.53 µm, 58 µm 2 , and -4.5 × 10 -8 µɛ -1 , respectively. Furthermore, the effect of placing raised outer cladding in the fiber structure is investigated which exhibits the MFD of 8.63 µm, the bending loss of 0.0093 dB for single turn of 5 mm radius, and the A eff of 87 µm 2 at 1.55 µm. In this case the strain sensitivity of n eff is reached to -6.7 × 10 -8 µɛ -1 . The mentioned effective area is magnificently large in the domain of bend insensitive fibers. In the meantime, the designed structures are insensitive to strain which is a crucial feature in applications with small curvature radius.

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“…For the GI-MMF whose index profile is radially parabolic, the transverse mode profile can be well approximated by the Laguerre-Gaussian function [13]. If the MMF is excited by standard SMF, modes with azimuthal index other than zero (LP νμ mode, ν≠0) annihilate due to mode orthogonality, which greatly simplifies the following analysis.…”

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confidence: 99%

Multiplexed Optical Fiber Sensors for Coal Fired Advanced Fossil Energy Systems

Wang¹,

Pickrell²

2012

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This three-year project started on October 1, 2008. In the project, a fiber optical sensing system based on intrinsic Fabry-Perot Interferometer (IFPI) was developed for strain and temperature measurements for Ultra Supercritical boiler condition assessment. Investigations were focused on sensor design, fabrication, attachment techniques and novel materials for high temperature and strain measurements.At the start of the project, the technical requirements for the sensing technology were determined together with our industrial partner Alstom Power. As is demonstrated in Chapter 4, all the technical requirements are successfully met. The success of the technology extended beyond laboratory test; its capability was further validated through the field test at DOE NETL, in which the sensors yielded distributed temperature mapping of a testing coupon installed in the turbine test rig. The measurement results agreed well with prior results generated with thermocouples.In this project, significant improvements were made to the IFPI sensor technology by splicing condition optimization, transmission loss reduction, sensor signal demodulation and sensor system design. These innovations have yielded three journal publications and two conference papers.

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Introduction to fiber optics

Cited by 619 publications

References 0 publications

Non-paraxial Split-step Finite-difference Method for Beam Propagation

Non-paraxial Split-step Finite-difference Method for Beam Propagation

Strain and Curvature Stability Enhanced SMF Introduction

Multiplexed Optical Fiber Sensors for Coal Fired Advanced Fossil Energy Systems

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