| 摘要 |
PROBLEM TO BE SOLVED: To enable switching the wavelength of light to be selected at a high speed. SOLUTION: The wavelength selecting node is provided with 1st and 2nd optical circulators 10 and 12, and respective optical circulators 10 and 12 are individually provided with three ports. Between the light circulators 10 and 12, a wavelength selecting means 26 is installed. And the wavelength selecting means 26 is constituted of a 2×2 matrix optical switch 28 and a fiber grating 30. The 2×2 matrix optical switch 28 is provided with four port X1, X2, Y1 and Y2, the port X1 is connected to the 1st input/output port 18 of the 1st optical circulator 10 by an optical fiber 40. In the same way, the port Y1 is connected to the 2nd input/output port 24 of the 2nd optical circulator 12 by an optical fiber 42. Besides, one end of the fiber grating 30 is connected to the port X2, the other end of the fiber grating 30 is connected to the port Y2, the port X2 is connected to the port Y2 by the fiber grating 30. |
