OPTICAL FIBER AND MODE SCRAMBLER PROVIDED THEREWITH

摘要

An optical fiber comprises a first fiber part (F1) provided with a first silica core (1) the cross section of which is formed to be rectangular or square and a first clad (2a) formed so as to clad the first core (1); and a second fiber part (F2) provided with a second silica core (11) the cross section of which is formed to be neither rectangular nor square and a second clad (12) formed so as to clad the second core (11). In order that laser beams having propagated along the first core (1) enters the second core (11), the second fiber part (F2) is subjected to fusion splice to the first fiber part (F1).