| 摘要 |
PROBLEM TO BE SOLVED: To provide a large mode area optical fiber designed to minimize the effects of bend-induced reductions in the fiber's effective cross-section, and to provide a method of manufacturing the optical fiber. SOLUTION: In order to reduce mode distortions as the fiber is bent, a profile is defined as a "pre-distorted" "as-fabricated" profile that takes into account the gradient introduced by bending the fiber during fabrication. A parabolic index profile is one exemplary bend-resistant profile. A raised-cone index is another profile. In any properly configured form, factors such as bend loss and mode distortion are significantly reduced, since the profile undergoes a shift of essentially constant gradient as a bend is introduced. The resultant effective cross-section of the inventive fiber is substantially improved over state-of-the-art fiber that is subjected to bending during installation. The as-fabricated profile may be incorporated into various types of fibers (birefringent, photonic bandgap, etc.), and is particularly well-suited for use in a fiber amplifier arrangement. COPYRIGHT: (C)2007,JPO&INPIT |
