Results 221 to 230 of about 65,653 (268)

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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Selective mode excitation of graded index optical fibers

Applied Optics, 1978
A method is described permitting excitation of a small number of modes in graded index fibers, the order of the launched mode being easily varied and determined. Using this launching technique, it is possible to determine the index profile and index difference of graded core fibers; results are compared with those obtained by other techniques.
L, Jeunhomme, J P, Pocholle
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Expanded single-mode fiber using graded index multimode fiber

Optical Engineering, 2004
A compact large Gaussian mode field diameter single-mode fiber is developed. This expanded single-mode fiber consists of splicing fibers with various lengths and characteristics. The principle of this optical arrangement is to excite the first mode of propagation of the multimode graded index to preserve a Gaussian field.
Chanclou, Philippe, Kaczmarek, C., Mouzer, G., Gravey, Philippe, Thual, Monique, Lecollinet, M.-A., Rochard, Philippe   +6 more
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Graded-Index Optical Fiber Sound Sensor

Advanced Photonics 2013, 2013
We describe an optical fiber sound detector based on the effect of diffraction of light that occurs at the exit end of a graded-index fiber.
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Optical loss measurement in graded-index fiber using a dummy fiber

Applied Optics, 1979
The utility of an auxiliary fiber, called a dummy fiber, is investigated for optical fiber loss measurements. The dummy fiber is spliced and used to excite the test fiber. Excess loss caused by undesirable modes is found to be reduced to less than 0.05 dB by using a 500-m dummy fiber and choosing the test fiber cut length to be 2 m for reference.
M, Tateda, T, Horiguchi, M, Tokuda, N, Uchida   +3 more
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Baseband frequency response of a graded-index fiber excited by a step-index fiber

Applied Optics, 1980
Input modal power distribution and baseband frequency response of a graded-index fiber have been investigated theoretically and experimentally, when the fiber was excited by a step-index fiber. It is found that the bandwidth of the graded-index fiber is measured with good reproducibility and accuracy by using the step-index fiber as an exciter.
T, Horiguchi, T, Tanifuji, M, Tokuda
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Reliabilty of Graded-Index Polymer Optical Fibers

MRS Proceedings, 1998
AbstractNewly developed low loss, graded-index polymer optical fibers (GI-POF) are being investigated as high bandwidth media for data transmission in local area networks and for interconnection of large telecommunications and computer systems. These fibers are fabricated by distributing refractive index-raising dopants to form a core profile in a ...
L. L. Blyler, T. Salamon, C. Ronaghan, C. S. Koeppen   +3 more
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