Patent ID: 6597847
Filing Date: 2003-07-22
Classification: G02B

Abstract:
An optical fiber for preserving plane of polarization, comprising:a core; and a clad disposed so as to surround said core, wherein a mode field diameter non-circularity ratio of the optical fiber which is calculated according to the equation: MFD&it;â€ƒ&it;non&it;-&it;circularity&it;â€ƒ&it;ratio&it;â€ƒ&it;(%)=Ma-MbMa2+Mb22Ã—100â€ƒ(where MFD indicates a mode field diameter, and Ma is the maximum value and Mb is the minimum value of the mode field diameter, respectively, in a wavelength region of light used), is about 3.2% or less to reduce the connection loss.