| 摘要 |
<p>An optical amplifier uses a single isolator (34) to perform both an input and an output optical isolating function by the use of a pair of graded index collimating lenses (26, 33) and two square arrays of four fibres (20, 21, 22, 23 and 27, 28, 29 and 30) arranged such that the signal passes twice through the isolator in collimated beams that are inclined to each other.</p> |
