Abstract:
The present invention generally relates to the field of fiber optics, and more particularly, to apparatuses, systems, and methods directed towards improving effective modal bandwidth within a fiber optic communication environment. In an embodiment, a multimode optical fiber in accordance with the present invention comprises a core and cladding material system where the refractive indices of the core and cladding are selected to modify the shape of the profile dispersion parameter, y, as a function of wavelength in such a way that the alpha parameter (α-parameter), which defines the refractive index profile, produces negative relative group delays over a broad range of wavelengths. The new shape of the profile dispersion parameter departs from traditional fibers where the profile dispersion parameter monotonically decreases around the selected wavelength that maximizes the effective modal bandwidth (EMB).
Abstract:
A method for selecting a test optical fiber for use in testing one or more optical transmitter. The method comprising the steps of: for the test optical fiber determining: a desired effective modal bandwidth (EMB D ); a percentage of allowable variation of the EMB D ( A ); a desired length ( L D ); a percentage of allowable variation of the L D ( B ); a tolerance variable ( X ); and a desired total bandwidth BW, where BW = EMB D L D ; selecting a candidate optical fiber; obtaining an effective modal bandwidth of the candidate optical fiber ( EMB sp ); rejecting the candidate optical fiber when EMB sp ≥ EMB D ( 1 + A + B ) is true or when EMB sp ≤ EMB D ( 1-A-B-X ) is true; cutting the candidate optical fiber to a first length L 1 , where L 1 = L D ( 1 + B ) , when EMB sp ≥ EMB D ( 1 + A + B ) is false and when EMB sp ≤ EMB D ( 1-A-B-X ) is false; measuring an effective modal bandwidth of the candidate optical fiber cut to the first length L 1 ( EMB m1 ) ; accepting the candidate optical fiber cut to the first length L 1 as the test optical fiber when BW 1 − A ≤ EMB m 1 L 1 ≤ BW 1 + A is true; performing additional evaluation steps when BW 1 − A ≤ EMB m 1 L 1 ≤ BW 1 + A is false.
Abstract:
At least some embodiments of the present invention relate to the field of optical fiber splicing and the evaluation of resulting splice joints. In an embodiment, the present invention is an apparatus for evaluating the integrity of a mechanical splice joint, and comprises a light source, digital video camera, digital signal processor, and visual indicator, wherein the apparatus connects to the test connector and the digital signal processor analyzes digital images of the scatter light from at least a portion of the test connector.
Abstract:
The present invention generally relates to the field of fiber optics, and more specifically to optical fibers, methods of manufacturing optical fibers, and methods of classifying optical fibers. In an embodiment, the present invention is a multimode optical fiber which comprises a core and clad material system where the refractive indices of the core and cladding are selected to minimize chromatic dispersion in the 850 nm wavelength window and the refractive index profile is optimized for minimum modal-chromatic dispersion in channels utilizing VCSEL transceivers. Multimode optical fibers according to this embodiment may have increased channel bandwidth.