Patent ID: 8398900
Filing Date: 2013-03-19
Classification: G02B

Abstract:
1. A method for manufacturing a self-compensating multimode fiber optic cable which compensates for both material dispersion and modal dispersion effects comprising: coupling a laser with a reference multimode fiber optic cable; generating and launching a plurality of pulses of light radiation by the laser into the reference multimode fiber optic cable, wherein each pulse of light radiation is launched at different radial offset; determining a DMD waveform profile along with a pulse delay for each pulse of light at each radial offset; determining if differences in pulse delays form a left or a right DMD temporal waveform shift as the radial offsets are increased; designing the self-compensating multimode fiber optic cable with a refractive index profile which compensates for any differences in pulse delay present in each DMD waveform profile, and which compensates for at least a portion of the material dispersion present in the reference multimode fiber optic cable; and manufacturing the self-compensating multimode fiber optic cable according to the design; wherein the refractive index profile comprises a lower-than-standard parabolic index of refraction in an outer region of a core of the reference multimode fiber optic cable if the reference multimode fiber optic cable exhibits a left temporal waveform shift as the radial offsets are increased; or wherein the refractive index profile comprises a higher-than-standard parabolic index of refraction in an outer region of a core of the reference multimode fiber optic cable if the reference multimode fiber optic cable exhibits a right DMD temporal waveform shift as the radial offsets are increased.