| 摘要 |
PURPOSE: To provide a polarization non-depending type optical isolator for preventing reflected and returned light from an optical system in optical fiber communication using a semiconductor laser, especially, in an optical fiber amplifier. CONSTITUTION: This optical isolator is provided with an optical isolator main body 10 where at least a Faraday rotor 13 is arranged between double refraction index crystal plates 11 and 14 and which is provided with a magnet 16 magnetizing the Faraday rotor on their outer periphery; and a collimator formed by fixing a focusing type rod lens 2 at the tip of an optical fiber 1 at both ends of the main body 10. The end face of the rod lens 2 is inclined byθto a surface A perpendicular to the center axis of the collimator.
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