Arrangement of an optical insulator, which the tilting of the optical axis on the basis of adhesive - deformation prevents

摘要

An optical isolator device comprises a magnet (14) having a rectangular channel (21) and a rectangular optical isolator element (15) fitted in the channel and fixed to the magnet by adhesive (22) filled up in a gap around the element in the channel. In order to avoid an increased thickness of the adhesive layer which is caused by round corners of the rectangular channel in production of the magnet by the injection molding, the magnet is formed with a small slit (41) outwardly extending from each corner of the rectangular channel. Thus, the element is fitted in the channel without interference of the channel corners and is in close contact with at least one (21a) of flat inner surfaces (21) of the channel to form a thin gap of 10 microns or less therebetween. Accordingly, the element is strongly adhered to the inner surface (21a) of the channel by the thin adhesive layer of 10 microns or less in the thin gap. In another approach, each of corners of the channel in the magnet is still round but the element is partially and obliquely cut away to form a facet at each of corners of the rectangular shape. IMAGE