| 摘要 |
PROBLEM TO BE SOLVED: To provide an optical module excellent in reliability for a long period by preventing water intrusion. SOLUTION: A plurality of metallic casings 2-4 into which optical part 2a, 3a, 4a are housed are fixed by welding, and an optical module 1 from which optical fibers 5a, 6a are protruding is coated by a first heat shrinkable seal material 7.
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