| 摘要 |
An optical XC apparatus is provided that is advantageous for the construction of a large-scale WDM optical network, and that minimizes signal loss variations between routes. The optical XC apparatus comprises four switch modules SWM 1 to SWM 4 each of which has, at each crosspoint in a matrix switch, a two-input, two-output wavelength routing element constructed from an acousto-optic tunable filter, wherein the input ports of the SWM 1 and SWM 3 are allocated as the input ports of the apparatus, the output ports of the SWM 2 and SWM 4 are allocated as the output ports of the apparatus, and the output ports and auxiliary output ports of SWM 1 and SWM 3 are connected to the input ports and auxiliary input ports of SWM 2 and SWM 4, to construct the optical XC apparatus. As the connections are made in such a manner that the number of intervening elements varies in an orderly manner, the output level relative to the input level can be made the same for all signals, irrespective of the routes they take, by providing level adjusters at both the input and output ports.
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