| US 7,583,877 B2 | ||
| Optical fiber, optical fiber connection structure and optical connector | ||
| Kanako Suzuki, Hitachi (Japan); Bing Yao, Hitachi (Japan); Kazumasa Ohsono, Hitachi (Japan); and Yoshihisa Kato, Hitachi (Japan) | ||
| Assigned to Hitachi Cable, Ltd., Tokyo (Japan) | ||
| Filed on Feb. 01, 2008, as Appl. No. 12/68,083. | ||
| Claims priority of application No. 2007-135406 (JP), filed on May 22, 2007. | ||
| Prior Publication US 2008/0292248 A1, Nov. 27, 2008 | ||
| Int. Cl. G02B 6/02 (2006.01) | ||
| U.S. Cl. 385—123 [382/124; 382/125] | 8 Claims |
| 1. An optical fiber, comprising:
a core;
a clad comprising a plurality of air holes at a periphery of the core; and
a hardening resin filled in a sealed portion at an end of the plurality of air holes,
wherein the hardening resin after a hardening comprises a fill length in a range of 7 mm to 8 mm,
wherein the core has a refractive index that is greater than a refractive index of the clad,
wherein the sealed portion has a refractive index that is less than the refractive index of the core and greater than the
refractive index of the clad, and
wherein a relative refractive-index difference between the refractive index of the sealed portion and the refractive index
of the clad is greater than zero and less than or equal to 0.4% in a temperature range of −40° C. to 70° C.
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