| 摘要 |
<p>A waveguide (3) carrying system signals at a first wavelength (μsystem) and OTDR signals at a second wavelength (μOTDR) is provided with optical amplifier means (5, 6) constituted by an optical amplifier (5) and an isolator (6). The isolator (6) has a high isolation factor at the first wavelength (μsystem) and a low isolation factor at the second wavelength (μOTDR).</p> |
