The influence of diffraction in microinterferometry and microtomography of optical fibers

Gorski, Witold

doi:10.1016/s0143-8166(02)00213-0

Cited by 6 publications

(5 citation statements)

References 9 publications

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“…Use of a developed commercial interference microscope, as opposed to implementation of a bulk optic interferometer, 18 offers several advantages for conducting this type of measurement. Interference microscopes, such as the Mach-Zehnder transmittedlight system discussed in Section 4, are designed to have precise, stable optical elements that minimize wave-front distortion and maintain path balance and thereby increase interference-image stability.…”

Section: Measurement Optimization For Characterizing Small Asymmetric...mentioning

confidence: 99%

“…Ray tracing offers one method for investigating whether a particular optical fiber sample would introduce too much deviation. 18,27 Consistent with the primary purpose of detecting small variations in refractive index, several portions of the measurement and analysis procedures can be changed within the reconstruction process to lower noise levels and subsequently improve detection of small variations in refractive index. Taking projections over a full 360°, taking additional projections, and employing various reconstruction filters all act to lower noise levels in certain regions of reconstructed objects.…”

Section: Measurement Optimization For Characterizing Small Asymmetric...mentioning

confidence: 99%

“…The second effort, by Górski, involved profiling optical fibers under conditions of relatively large index differences (greater than 0.015) between fiber cladding and surrounding matching oil. 18 Under such conditions, it becomes difficult to characterize small index changes over an entire cross section, in part because of enhanced diffraction effects. Simulations and measurements made with a bulk interferometer system were conducted for a symmetric multimode optical fiber.…”

Section: Introductionmentioning

confidence: 99%

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Microinterferometric optical phase tomography for measuring small, asymmetric refractive-index differences in the profiles of optical fibers and fiber devices

Bachim¹,

Gaylord²

2005

Appl. Opt.

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A new technique, microinterferometric optical phase tomography, is introduced for use in measuring small, asymmetric refractive-index differences in the profiles of optical fibers and fiber devices. The method combines microscopy-based fringe-field interferometry with parallel projection-based computed tomography to characterize fiber index profiles. The theory relating interference measurements to the projection set required for tomographic reconstruction is given, and discrete numerical simulations are presented for three test index profiles that establish the technique's ability to characterize fiber with small, asymmetric index differences. An experimental measurement configuration and specific interferometry and tomography practices employed in the technique are discussed.

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Section: Measurement Optimization For Characterizing Small Asymmetric...mentioning

confidence: 99%

Section: Measurement Optimization For Characterizing Small Asymmetric...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Microinterferometric optical phase tomography for measuring small, asymmetric refractive-index differences in the profiles of optical fibers and fiber devices

Bachim¹,

Gaylord²

2005

Appl. Opt.

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“…The resolution values of the technique are estimated and depend on many factors (CCD array size, resolving power, beam deflection, source wavelength, etc.). 8,9 In summary, we have presented the first, to our knowledge, nondestructive measurements of optical fiber refractive-index profiles obtained with MIOPT. The example measured profiles demonstrate experimentally the ability of MIOPT to profile both azimuthally asymmetric and symmetric optical fibers or fiber devices.…”

mentioning

confidence: 97%

Refractive-index profiling of azimuthally asymmetric optical fibers by microinterferometric optical phase tomography

2005

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Accurate nondestructive refractive-index profiling is needed in the modeling, design, and manufacturing of optical fibers and fiber devices. Most profile measurement techniques cannot correctly characterize fibers with small or irregular refractive-index variations over their cross sections. Microinterferometric optical phase tomography (MIOPT) is a technique that allows measurement of fiber refractive-index profiles exhibiting such variations. We present the first demonstration, to our knowledge, of MIOPT. The profile of a polarization-maintaining fiber is measured by MIOPT and shown to be in agreement with (destructive) fiber end-face measurements. MIOPT is also applied to the limiting case of a symmetric single-mode fiber.

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“…In case presented below 180 frames were taken (rotation step ∆α=1°), phase reconstruction for each interferogram. 2D map o refractive index is done with 5 points spatial carrier phase shifting algorithm [10], calculation of 3D distribution of refractive index (modified filtered back projection method [11]). …”

Section: Methodsmentioning

confidence: 99%

Application of microinterferometric tomography as an evaluation tool for phase micro-objects

Kniazewski

Krajewski

Kujawińska

et al. 2005

Eighth International Symposium on Laser Metrology

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Microinterferometric tomography allows for determination of three-dimensional refractive index distributions in phase isotropic microelements. In this paper we present the measurement of the refractive index profile of the optical fibers exposed to the gamma radiation. Nuclear radiation is known to affect the guiding properties of optical fibers and it is therefore essential to characterize these effects to assess the applicability of fiber-optic technology for communication and sensing in nuclear industry. It is already well known that radiation affects the absorption of the fiber. Here, we investigated whether we could quantify the effect of radiation on the refractive index of core and cladding of an optical fiber.

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The influence of diffraction in microinterferometry and microtomography of optical fibers

Cited by 6 publications

References 9 publications

Microinterferometric optical phase tomography for measuring small, asymmetric refractive-index differences in the profiles of optical fibers and fiber devices

Microinterferometric optical phase tomography for measuring small, asymmetric refractive-index differences in the profiles of optical fibers and fiber devices

Refractive-index profiling of azimuthally asymmetric optical fibers by microinterferometric optical phase tomography

Application of microinterferometric tomography as an evaluation tool for phase micro-objects

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