Digital Holographic Interferometric Characterization of Optical Waveguides

Wahba, H. H.; El-Din, Mamdouh Shams

doi:10.5772/22311

Cited by 2 publications

(7 citation statements)

References 57 publications

(73 reference statements)

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“…5(a) using an appropriate algorithm [12]. After excluding the background using the subtraction method [12,22,23], the optical phase differences that evolved due to the presence of the bent fiber is as shown in Fig. 5(c).…”

Section: Resultsmentioning

confidence: 99%

“…In the digital holographic interferometric phase shifting method [12,[20][21][22][23], a set of five phase shifted holograms with known mutual phase shifts, starting from 0°in steps of 90°, is recorded. These holograms are given by I n aζ; η bζ; η cosφζ; η φ Rn ; n 1; 2; 3; …;…”

Section: B Digital Holographic Interferometric Phase Shifting Methodsmentioning

confidence: 99%

“…In this process the phase and intensity of the hologram can be calculated using the diffraction integral [20][21][22][23]. The complex wave field in the image plane is given by b 0 x 0 ; y 0 1 iλ ZZ hζ; ηr ζ; η expfiwρg ρ dζdη; (12) with ρ d 02 ζ − x 0 2 η − y 0 2 p and w is the wave number (w 2π∕λ).…”

Section: B Digital Holographic Interferometric Phase Shifting Methodsmentioning

confidence: 99%

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Two-dimensional refractive index and stresses profiles of a homogenous bent optical fiber

2014

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We present a significant contribution to the theory of determining the refractive index profile of a bent homogenous optical fiber. In this theory we consider two different processes controlling the index profile variations. The first is the linear index variation due to stress along the bent radius, and the second is the release of this stress on the fiber surface. This release process is considered to have radial dependence on the fiber radius. These considerations enable us to construct the index profile in two dimensions normal to the optical axis, considering the refraction of light rays traversing the fiber. This theory is applied to optical homogenous bent fiber with two bending radii when they are located orthogonal to the light path of the object arm in the holographic setup (like the Mach-Zehnder interferometer). Digital holographic phase shifting interferometry is employed in this study. The recorded phase shifted holograms have been combined, reconstructed, and processed to extract the phase map of the bent optical fiber. A comparison between the extracted optical phase differences and the calculated one indicates that the refractive index profile variation should include the above mentioned two processes, which are considered as a response for stress distribution across the fiber's cross section. The experimentally obtained refractive index profiles provide the stress induced birefringence profile. Thus we are able to present a realistic induced stress profile due to bending.

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Section: Resultsmentioning

confidence: 99%

Section: B Digital Holographic Interferometric Phase Shifting Methodsmentioning

confidence: 99%

Section: B Digital Holographic Interferometric Phase Shifting Methodsmentioning

confidence: 99%

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Two-dimensional refractive index and stresses profiles of a homogenous bent optical fiber

2014

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“…Accurate characterization of optical fibers is required in order to know about their functions and performances. There are many methods of optical fibers characterization such as optical microscopy, electron microscopy, X-ray spectrometry, infrared spectroscopy, light diffraction, light scattering, optical interferometry, and digital holography [1,3,[12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29]. Optical interferometry is an effective accurate tool for studying and characterizing optical fibers.…”

Section: Characterization Of Optical Fibersmentioning

confidence: 99%

“…Moreover, the phase shifting interferometric (PSI) technique was introduced by Hariharan et al as an accurate method for measuring interference fringes in the real time [49]. Recently, digital holographic phase shifting interferometry (DHPSI) was used to investigate some optical parameters of fibrous materials [17,18,21,[26][27][28][29].…”

Section: Characterization Of 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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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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Digital Holographic Interferometric Characterization of Optical Waveguides

Cited by 2 publications

References 57 publications

Two-dimensional refractive index and stresses profiles of a homogenous bent optical fiber

Two-dimensional refractive index and stresses profiles of a homogenous bent optical fiber

Optical Fibers Profiling Using Interferometric and Digital Holographic Methods

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