Core-index determination of a thick fibre using lens-fibre interference (LFI) technique

Hamza, A.A.; Mabrouk, M.; Ramadan, W. A.; Wahba, H. H.

doi:10.1016/j.optlaseng.2003.09.002

Cited by 17 publications

(10 citation statements)

References 7 publications

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“…This type of interference was called lens-fiber interferometry (LFI) since the interference fringes were produced by a combination of an aberrated cylindrical lens and a thick optical fiber. The aberrated cylindrical lens was used to focus a parallel beam on this fiber, which was located in the focal plane of the cylindrical lens [60], see Figure 22.…”

Section: Homogeneous Thick Optical Fibersmentioning

confidence: 99%

“…where Δ(z 1 ) and Δ(z 2 ) are the optical path lengths of the two interfered rays. In 2004, Hamza et al developed LFI technique in order to determine the refractive index of the core of a skin-core thick optical fiber [60]. They derived a mathematical expression for the optical paths through the fiber in order to reconstruct the interfernce pattern due to the used fiber when it is used as a thick fiber in the LFI system.…”

Section: Homogeneous Thick Optical Fibersmentioning

confidence: 99%

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Optical Fibers Profiling Using Interferometric and Digital Holographic Methods

Wahba¹,

Ramadan²,

El-Tawargy³

2020

Optical Fiber Applications

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Optical fibers are extensively used in modern technology such as sensing, shortdistance and long-distance telecommunications. This motivated many researchers to present different methods in order to characterize optical fibers and determine their refractive index profiles. In addition, variation of refractive index profiles of optical fibers suffering mechanical stresses or other external effects reflects good information about the internal structure of these fibers and how they are responding to these external effects. Optical interferometry and digital holography methods are accurate and effective tools used to achieve this task. In this chapter, we illustrate the application of different types of optical interference on conventional, polarizing maintaining and thick optical fibers. Also, we illustrate some mathematical interpretations (and recently automatic analyzing of interference patterns) that have been used to reconstruct the accurate refractive index profiles of optical fibers. Some experimental interferograms and refractive index profiles are demonstrated as well.

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Section: Homogeneous Thick Optical Fibersmentioning

confidence: 99%

Section: Homogeneous Thick Optical Fibersmentioning

confidence: 99%

Optical Fibers Profiling Using Interferometric and Digital Holographic Methods

Wahba¹,

Ramadan²,

El-Tawargy³

2020

Optical Fiber Applications

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“…Figure 3 represents the modified LFI technique to study the refractive indices of liquids. In this setup the thick fibre, in [13], is replaced by the capillary tube that contains the liquid under study. The capillary tube is divided into two halves.…”

Section: Theorymentioning

confidence: 99%

“…A few years ago, El-Ghandoor [10,11] and Ramadan [12,13] were experiencing interference of light by inserting a cylindrical lens in the path between a parallel beam of light and an optical fibre. This kind of interference is called Ramadan lens-fibre interferometry (LFI), in which, due to the aberration of the cylindrical lens, the emerged light will be focused on a series of parallel lines and the fibre was inserted parallel to these lines.…”

Section: Introductionmentioning

confidence: 99%

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Lens–fibre interference in measuring liquids' refractive indices

Ramadan¹,

Wahba²

2005

Meas. Sci. Technol.

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In this paper, another approach to measure the refractive indices of liquids is proposed. The method is based on lens–fibre interference. This uses a capillary tube containing the measured liquid instead of the fibres. A part of the capillary tube is empty to calibrate the system. A simple mathematical expression has been derived to get the liquid refractive index by measuring only the deviation angle from the interferogram. The constants that relate the liquid refractive index to the deviation angle have been determined using a standard set of liquids. This method can measure liquids' refractive indices in a wide range with an error less than ±1 × 10−3, which is expected in the case of two-beam interference.

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