| 摘要 |
<p>An optical switching device comprising a housing (2) having means for receiving three or more optical fibres, an electrically operable means (44) for moving an optical path changing device (36, 38) between different positions for switching optical coupling paths selectively between pairs of the optical fibers. A cable (16) carries at least one of the optical fibers and electrically conducting member, electrical coupling means being provided between the cable and the electrically operable means so that when there is no power in the electrically conducting member the or each optical fiber within the cable is optically decoupled from the other optical fibers within the housing. A local area network incorporating the optical switching devices is also provided.</p> |
