New method for measuring V-value of a single-mode optical fibre

Katsuyama, Yutaka; Tokuda, Masamitsu; Uchida, Naoya; Nakahara, M.

doi:10.1049/el:19760513

Cited by 62 publications

(8 citation statements)

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“…However, as pointed out in Section I, X ec depends on the deployment condition which has to be specified first. In this paper, X,, is obtained for a deployment condition typically employed in the bending loss measurement method [6], and recommended by CCITT. The spectral power P, transmitted through a 2-m-long fiber arranged in a single loop of ra- dius R (shown as a solid circle in Fig.…”

Section: Calculation Of the Curvaturementioning

confidence: 99%

“…DISCUSSIONS OF NUMERICAL AND EXPERIMENTAL RESULTS In this section, the results of calculations of the bending loss of the first higher-order mode, and the effective cutoff wavelength for two depressed cladding and one matchedcladding fiber are presented. The effective cutoff wavelength of these fibers as a function of R was measured using the bend loss technique [6]. The experimental results are compared with the calculated results to assess the applicability of formulas developed in the previous sections.…”

Section: Calculation Of the Curvaturementioning

confidence: 99%

“…The field in a curved depressed-cladding fiber is described by (l), (4)- (6), and (8)- ( l l). To compute the coefficient D of the transmitted wave in terms of the incident field coefficient B , we need to use the continuity of the tangential field components at r = b to eliminate the reflected field coefficient.…”

Section: Appendixmentioning

confidence: 99%

“…Work has been reported on the length dependence [2]- [4], on the curvature dependence [5], and on the measurement techniques used to determine X,, [6]- [9]. Recently [lo]- [ll], measurement results have been reported on the curvature dependence of X,, in depressed cladding fibers that indicated that contrary to the matched-cladding design the cutoff wavelength is curvature insensitive for bend radii (as low as 5 cm) of practical interest.…”

Section: Introductionmentioning

confidence: 99%

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Curvature dependence of the effective cutoff wavelength in single-mode fibers

Shah

1987

J. Lightwave Technol.

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Abstruct-The curvature dependence of the effective cutoff wavelength is investigated for both matched-cladding and depressed-cladding fibers. Contrary to the depressed-cladding fiber, the cutoff wavelength of the matched-cladding fiber is strongly curvature dependent. A formula is developed for the bending loss of the first higher-order mode group in a depressed-cladding fiber. By taking into account the effect of the stress-induced changes in the refractive index on the loss the first higher-order mode group, the effective cutoff wavelength as a function of curvature is calculated. The theoretical results show good agreement with measured values, which verify the curvature insensitivity of the effective cutoff wavelength of depressed cladding fibers.

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Section: Calculation Of the Curvaturementioning

confidence: 99%

Section: Calculation Of the Curvaturementioning

confidence: 99%

Section: Appendixmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Curvature dependence of the effective cutoff wavelength in single-mode fibers

Shah

1987

J. Lightwave Technol.

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“…They can be measured directly [1][2][3][4][5], calculated from the refractive index profile of the lightguide fiber [4] by solving the scalar wave equation, or calculated for the equivalent step-index model [6,7].…”

Section: Introductionmentioning

confidence: 99%

Numerical Method of Determining the Cutoff Frequency and Mode Speckle Pattern of Optical Waveguides

Afanas'ev¹,

Myalitsin²,

Sadykov

et al. 2005

Russ Phys J

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Based on a numerical solution of the nonstationary wave equation, an algorithm for determining the eigenfunctions and eigenvalues of the LP im modes of axially symmetric optical waveguides is suggested. The cutoff frequency of the LP 11 mode of different waveguides is determined using the algorithm constructed. The results obtained are compared with the well-known analytical formulas and results of numerical calculations for the equivalent stepindex waveguide model. Based on the analytical results obtained, an eigenfunction and eigenvalue search algorithm is suggested for a waveguide with a two-dimensional refractive index profile (in particular, for an axially nonsymmetric waveguide).

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Length dependence of cutoff wavelength for single‐mode fiber

Kitayama

Tanaka

1985

Electron. Comm. Jpn. Pt. I

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The effective cutoff wavelength of single‐mode fiber cable cannot be completely determined because the bending loss, which prevents propagation of the second‐order mode, depends upon the bending distribution of the fiber as well as on the length and index profile of the fiber. By measuring the bending loss of the LPn mode of step‐index single‐mode fiber, it is found that the effective cutoff wavelength of reel‐wound fiber shifts to lower wavelengths along the distance. The length dependence is proved by experiment and agrees well with the theory. The length dependence of the cutoff wavelength of optical cable is estimated by experiment and it is established that the effective cutoff wavelength can be prescribed by the microbending profile and, compared with the value given by the conventional bend method of a 2‐m sample, the decrease in effective cutoff wavelength for 1‐m cable is estimated as 0.1 um. If this length dependence is used, it can be applied in long‐distance systems provided a fiber having longer cutoff wavelength and favorable.bending loss characteristics or low dispersion is used.

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New method for measuring V-value of a single-mode optical fibre

Cited by 62 publications

References 0 publications

Curvature dependence of the effective cutoff wavelength in single-mode fibers

Curvature dependence of the effective cutoff wavelength in single-mode fibers

Numerical Method of Determining the Cutoff Frequency and Mode Speckle Pattern of Optical Waveguides

Length dependence of cutoff wavelength for single‐mode fiber

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