OPTICAL FIBER HAVING HIGH SBS THRESHOLD AS WELL AS MINIMIZED MARCOBENDING LOSS

摘要

The present invention provides an optical fiber comprising core and clad regions. The core region is divided into three sub-core regions, namely first core region, second core region, and third core region, having respective relative refractive indices related by equation Ia:?1 > ?3 > ?2 Eqn. Ic The clad region is divided into four sub-clad regions, namely first clad region, second clad region, third clad region, and fourth clad region, having respective relative refractive indices related by equation Ib: ?6 = ?7 > A4 > ?5 Eqn. Id. wherein, the relative refractive index of the first core region, second core region, third core region, first clad region, second clad region, third clad region, and fourth clad region are ?1, ?2, ?3, ?4, ?5, ?6, and ?7 respectively.