Results 141 to 150 of about 65,580 (195)

Transmission characteristics of graded-index fibers

Fiber and Integrated Optics, 1979
Abstract The use of graded-index fibers for optical communication systems is now under consideration for numerous civil and military applications, and in these either LED or laser sources can be developed. The bandwidth of the system depends on the source linewidth, the dispersion of refractive index in the fiber, the strength of excitation of the ...
P. J. B. Clarricoats, J. M. Arnold, G. Crone   +2 more
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Graded-index fiber tip optical tweezers

SPIE Proceedings, 2013
Optical fiber tweezers based on a graded-index multimode fiber (GIMMF) tip is proposed. Light propagation characteristics and gradient force distribution near the GIMMF tip are numerically investigated, which are further compared with that of optical fiber tips based on conventional single mode fibers.
Yuan Gong, Ai-Yan Ye, Yu Wu, Yunjiang Rao, Yao Yao, Song Xiao   +5 more
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Aberrations in curved graded-index fibers

Journal of the Optical Society of America, 1979
Graded-index fibers can be efficiently used as image relays and therefore it is necessary to study the aberrations in the images transmitted through these media. Since curvature in fibers is inevitable, aberrations in curved graded-index fibers are also important.
Aruna Rohra, K. Thyagarajan, A.K. Ghatak
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Graded Index Polymer Optical Fiber Amplifiers

Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals, 1998
Gain dynamics such as signal wavelength dependence and pump wavelength dependence for organic dye-doped graded index (GI) polymer optical fiber amplifiers (POFA) are characterized. A Rhodamine B-doped POFA, 1 m in length and 0.3 mm in core diameter, has exhibited more than 20 dB gain at signal wavelengths from 560 nm to 600 nm when optically pumped at ...
Takeyuki Kobayashi, Keisuke Sasaki, Yasuhiro Koike   +2 more
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Wavelength dependence of spliced graded-index multimode fibers

Applied Optics, 1979
Profile dispersion affects the bandwidth of graded-index multimode fibers. In this paper, two graded-index multimode fibers of nearly 2-km length, of different index profile, and the combined fiber obtained by splicing them are examined by the swept-frequency method. It was confirmed that the spliced fiber also has a wavelength-dependent characteristic,
T, Matsumoto, K, Nakagawa
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Modal dispersion in multimode graded-index fibers

Applied Optics, 1975
A complete analysis of the propagation characteristics of a ray through an axially symmetric graded-index medium is carried out in the geometrical optics approximation. First, two constants of the motion are shown to exist for a ray propagating in an infinite medium.
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Graded-index glass fiber optical waveguide

Soviet Journal of Quantum Electronics, 1976
A technology was developed for the fabrication of graded-index fiber waveguides. Waveguides were prepared with a total diameter of 120 μ, core diameter of 45 μ, numerical aperture of 0.15, and total attenuation of 20–30 dB/km in the spectral range of interest in optical communication systems.
A V Belov, A N Gur'yanov, D D Gusovskiĭ, G G Devyatykh, Evgenii M Dianov, V G Luzhain, A V Nikolaĭchik, A M Prokhorov, A S Yushin   +8 more
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Differential mode attenuation measurements in graded-index fibers

Applied Optics, 1978
An automated apparatus is described for measuring mode-dependent scattering and total attenuation in graded-index waveguides. Measurements are reported for two low-loss waveguides and several high-loss waveguides. The results illustrate the ability of this technique to identify different types of loss mechanisms.
R, Olshansky, S M, Oaks
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Leaky modes in graded index optical fibers

Applied Optics, 1976
Leaky mode attenuation coefficients for graded index optical fibers are derived using the WKB approximation. For the case of a parabolic index profile, the attenuation coefficients for explicitly evaluated and used to calculate the leaky mode contribution to near field and attenuation measurements.
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Fiber coupling using graded-index rod lenses

Applied Optics, 1980
The graded-index rod lens (GRIN lens) is useful in coupling between multimode optical fibers. Applications include connectors, switches, multiplexers, and branch couplers. In these devices, one GRIN lens collimates light from an input fiber, and a second lens collects the light and focuses it on an output fiber.
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