| 摘要 |
A compensator for compensating polarisation-mode dispersion, comprises: a splitter (30) arranged to split light, according to the light's polarisation, between a first optical path and a second optical path; a combiner (40) arranged to combine light from the first optical path and the second optical path; an active group-delay device (280), arranged in the first optical path, for delaying the light in the first optical path relative to the light in the second optical path; a monitor (65) for monitoring chromatic polarisation-mode dispersion on the light; and an active wavelength-delay device (20) arranged upstream or downstream of the splitter (30). Components of the light having different wavelengths are subjected to different delays in the active wavelength-delay device (20), the different delays comprising delays selected to compensate chromatic dispersion in light entering the compensator. The different delays further comprise delays selected according to an output from the monitor (65). |
