Optical waveguides – Optical fiber bundle
Patent
1996-04-18
1998-01-13
Lee, John D.
Optical waveguides
Optical fiber bundle
385 31, G02B 604
Patent
active
057087474
ABSTRACT:
A fiber-based delivery system and method for delivering pulsed high power optical radiation (14) over longer fiber lengths than prior fiber-based systems comprises a fiber bundle (10) and a beam launcher (12) that directs a high power optical beam (14) to an input end (18) of the fiber bundle (10), and distributes it over the individual fibers (22) in the bundle. The number of fibers (22) is large enough so that substantially all of the individual fibers (22) are subjected to an optical intensity level below that required to induce substantial nonlinear optical losses. In addition, the diameters of the individual fiber cores (34) are small enough so that the modal dispersion experienced by the optical beam (14) does not exceed approximately 80 ns/km. In a preferred embodiment for transmission of pulsed 1.06 micron light, the fiber bundle (10) comprises 96 individual fibers (22), with respective core (34) diameters of approximately 600 microns, that are encapsulated in a jacketed adhesive (30). The fibers are preferably spaced from each other in the adhesive (30) such that the cumulative cross-sectional areas of their cores (34) occupy at least 75 percent of the total cross-sectional area of the fiber bundle (10).
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R.G. Smith, "Optical Power Handling capacity of Low Loss Optical Fibers as Determined by Stimulated Raman and Brillouin Scattering", Applied Optics, vol. 11, No. 11, Nov. 1972, pp. 2489-2494.
Bahaa E. A. Saleh, Malvin Carl Teich, Fundamentals of Photonics, John Wiley
Denson-Low W. K.
Hughes Aircraft Company
Lee John D.
Schubert W. C.
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