NON-REFLECTION TERMINAL OPTICAL FIBER AND OPTICAL DEVICE HAVING IT

PROBLEM TO BE SOLVED: To provide a non-reflection terminal optical fiber and an optical device having it wherein even return light of any linear polarized wave component is not generated by fusion splicing the string of an absolutely single polarized wave optical fiber to the terminal of the optical fiber and leaking polarized wave mode light incident on it. SOLUTION: The string of the absolutely single polarized wave optical fiber 3 to which bending is imparted is welded to the terminal of the optical fiber 1. Also, a second absolutely single polarized wave optical fiber 3' to which bending is imparted is further welded to the terminal of the absolutely single polarized wave optical fiber 3 in the state that a polarization plane is rotated by nearly 90 deg..