Nondestructive determination of refractive-index profile and cross-sectional geometry of optical-fibre preform

Chu, P.L.; Saekeang, C.

doi:10.1049/el:19790452

Cited by 15 publications

(2 citation statements)

References 5 publications

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“…For preforms, non-destructive techniques are particularly useful. One such technique is to measure the deflection of a transversely directed beam scanned along the diameter of the preform [1][2][3][4][5][6][7]. After measuring the deflection, the index profile is calculated.…”

Section: Introductionmentioning

confidence: 99%

Practical aspects on measuring refractive index profiles of non-circular fibreoptic preforms

Helander¹

2005

Meas. Sci. Technol.

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The influence of a non-circular cross section of a preform on the measurement of the refractive index was investigated. The deviation of the refractive index value from the value for a circular cross section can be both positive and negative depending on the rotational orientation of the preform. Therefore, the measurement is done at many rotational angles and the refractive index is calculated by averaging over the angles. The best solution was to define a number of layers and calculate the thickness and index for each layer in the preform. This was done for each angle and then the average of all index values for all angles was calculated. With this approach, the obtained refractive index is almost independent of the ovality for a variation of the diameter of ±10%.

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Section: Introductionmentioning

confidence: 99%

Practical aspects on measuring refractive index profiles of non-circular fibreoptic preforms

Helander¹

2005

Meas. Sci. Technol.

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“…Marcuse proposed an experimentally more convenient method by using Abel's inversion [4]. With a priori knowledge of near circular or elliptical preforms, several methods were proposed for non-circularly symmetric conventional preform measurements [5][6][7][8][9]. A nondestructive measurement of the two-dimensional refractive index profile for arbitrary preform index distributions without a priori knowledge of the preform was proposed by using the tomography method [10].…”

Section: Introductionmentioning

confidence: 99%