Results 211 to 220 of about 65,653 (268)

Refracting leaky rays in graded-index fibers

Applied Optics, 1978
A local plane wave analysis is employed to derive the ray power transmission and attenuation coefficients for refracting leaky rays on graded-index fibers. These coefficients also reduce to established forms for tunneling rays and are compared with modal attenuation coefficients in the limit of strongly refracting rays.
J D, Love, C, Winkler
openaire   +2 more sources

Graded-index characteristics in single-crystal fibers

Optics Letters, 1998
Single-crystal fibers of Ti(3+):Al(2)O (3)have been grown by the laser-heated pedestal growth technique and shown to exhibit radial refractive-index gradients. A refractive-index increase of approximately 12% in the fiber core with respect to the fiber sidewalls has been measured. The index profile can be fitted with a parabolic model.
J H, Sharp, R, Illingworth, I S, Ruddock
openaire   +2 more sources

Light propagation in graded-index optical fibers

Applied Optics, 1978
An accurate numerical method is described for solving the Helmholtz equation for a general class of optical fibers. The method yields detailed information about the spatial and angular properties of the propagating beam as well as the modal propagation constants for the fiber.
M D, Feit, J A, Fleck
openaire   +2 more sources

Refractive index profiling of graded index optical fibers

Review of Scientific Instruments, 1976
Details of a method of determining the refractive index distribution of graded-index optical fibers based on interference microscopy are discussed. Sample preparation techniques, observational methods, and data reduction and analysis by a computer fitting program are described.
H. M. Presby, W. Mammel, R. M. Derosier
openaire   +1 more source

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
openaire   +1 more source

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
openaire   +1 more source

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
openaire   +1 more source

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
openaire   +1 more source

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.
openaire   +2 more sources

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
openaire   +2 more sources