Optical fuse

40-word commentary: A device inserted in an optical fiber circuit which breaks in responce to excess incident light. As is the case of fuse in electric apparatus, it protects optical systems from accidents. My device is made of a low-melting glass and breaks down thermaly.

1. S. Todoroki: “Optical fuse and component for fabricating optical fuse”, US Patent No.7403684.
   (Issued: Jul. 22, 2008, Filed: May 9, 2006).
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2. S. Todoroki: “Heat-induced breakage of an optical circuit at a TeO$_2$ glass bridge linking silica glass fibers”, J. Ceram. Soc. Jpn., 114, 8, pp. 709-712 (2006).
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3. S. Todoroki and S. Inoue: “Optical fuse by carbon-coated TeO$_2$ glass segment inserted in silica glass optical fiber circuit (express letter)”, Jpn. J. Appl. Phys., 43, 2B, pp. L256-L257 (2004).
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