OPTICAL ISOLATOR DEVICE AND OPTICAL COMMUNICATION SYSTEM

摘要

PROBLEM TO BE SOLVED: To obtain an optical isolator device which does not require the impression of magnetic fields with a small size. SOLUTION: The optical isolator device 1 is constituted by forming films having structures periodically changing in light transmittance in a prescribed direction on an optical transparent medium layer 11. The optical isolator device 2 is otherwise constituted by holding the films having the structures periodically changing in light transmittance in the prescribed direction by a pair of optical transparent medium layers 11 (12) having the refractive indices varying from each other. The films described above are fine structure thin films 10 having square lattices, fine structure thin films (10a) having hexagonal lattices, fine structure thin films (10b) having rectangular lattices or fine structure thin films 10c having diagonal lattices.