| 摘要 |
Apparatus which comprises at least one length of flexible optic fibre, storage means for receiving the length of optic fibre, means for transmitting an optical signal along the length of optic fibre, and means for detecting an optical signal in the length of optic fibre. There is also provided a communication or security system which comprises at least one loop of flexible optic fibre, a reel on which the optic fibre is coilable, means for transmitting an optical signal along the loop of optic fibre, and means for detecting an optical signal in the length of optic fibre.
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