| 摘要 |
PROBLEM TO BE SOLVED: To fix a magnet more firmly by preventing the magnet from falling off due to the degradation of a bonded part caused under the harsh environment such as temperature cycles and high temperature and humidity, mechanical shocks, the influence of the time of YAG laser welding. SOLUTION: A stub bonded to an optical isolator element on an end face is arranged in a through-hole of a retainer, and the above retainer is provided with the magnet for applying a magnetic field to the above optical isolator so as to cover the outer circumference of the above magnet. COPYRIGHT: (C)2006,JPO&NCIPI
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