| 摘要 |
PROBLEM TO BE SOLVED: To provide a wave length dispersion compensating function for a luminous signal and a distribution function to an optional beam passage for the luminous signal. SOLUTION: This optical filter 10 is provided with one input port 12, two output ports 14a, 14b, two optical circulators 16a, 16b, and two FBGs(fiber Bragg grating) 18a, 18b. Respective optical circulators 16a, 16b are provided with the first ports (a), the second ports (b), and the third ports (c). Each optical circulator is constituted to output a luminous signal input to the first port (a) to the second port (b), and to output the luminous signal input to the second port (b) to the third port (c). The first port (a) in the first circulator 16a is connected to the input port 12. The third ports (c) in the respective circulators are connected to the respective output ports 14a, 14b. The second port (b) in the first optical circulator 16a and the first port (a) in the second optical circulator 16b are connected via the first FBG 18a. The end of the second FBG 18b is connected to the second port (b) in the second optical circulator 16b. |
