Results 151 to 160 of about 65,580 (195)

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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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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Mode excitation in graded-index optical fibers

Journal of Lightwave Technology, 1984
We report on theoretical and experimental investigations of the excitation of graded-index fiber modes by a laser beam. The far-field irradiance distribution and the focusing qualities are measured and are related to the measured refractive-index profiles of some commercially available graded-index fibers.
L. Lundgren, K. Vilhelmsson
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Optimum design of graded-index fiber structure

Optical Fiber Communication, 1979
It is generally accepted that graded-index fiber will soon be in practical use for medium- to large-capacity trunk lines. However, the procedure for fiber structural design is not fully established. Fiber parameters should be determined considering the synthetic requirement for transmission characteristics, mechanical properties, installation and ...
Shigeyuki Seikai, Norio Kashima, Ken-Ichi Kitayama, Naoya Uchida   +3 more
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Profile inhomogeneity in multimode graded-index fibers

Journal of Lightwave Technology, 1989
Profile parameters (g) of several multimode graded-index fibers have been measured. It was found that g may vary azimuthally by +or-0.15 or more in fibers for which the average value is between 1.8 and 2.2. >
C.W. Oates, M. Young
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Mode Coupling Effects in Graded-Index Optical Fibers

Applied Optics, 1975
Mode coupling theory is applied to the study of multimode optical fibers with graded-index cores. For coupling caused by random bends in the waveguide axis, the results predict the dependence of the induced losses on the fiber's characteristics. The impulse response is determined for fibers with random bends having several different power spectra.
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Principal Modes in Graded-Index Multimode Fibers

Frontiers in Optics 2009/Laser Science XXV/Fall 2009 OSA Optics & Photonics Technical Digest, 2009
We model multimode propagation, including spatial- and polarization-mode coupling. At low coupling, the impulse response is polarization-dependent; differential mode delays (DMDs) scale linearly with length. At high coupling, DMDs scale as the square-root of length.
Mahdieh B. Shemirani, Joseph M. Kahn
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