| 摘要 |
The present invention relates to a device and a method for wavelength selective filtration of optical wavelength channels. The wavelength selectiv e filter (1) includes one or more wavelength selective add-drop elements (10, 12, 14 and 16) and one or more on-off switches (20, 22, 24 and 26), wherein a first and a second side of the wavelength selective add-drop elements (10, 1 2, 14 and 16) includes an input and an output, wherein said on-off switches (20 , 22, 24 and 26) are disposed between said input and output on the second side of the wavelength-selective add-drop elements (10, 12, 14 and 16), and where in in the event of more than one wavelength selective add-drop element said elements are interconnected by means of a connecting waveguide between respective outputs and inputs on the first side of respective wavelength selective add-drop elements.
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