| 摘要 |
PROBLEM TO BE SOLVED: To attain miniaturization and also to attain a small loss. SOLUTION: An optical branching device 21 and a wavelength demultiplexer/ multiplexer 22 which are reflecting material, first, second, third and fourth lenses 31-34, and an independent type optical isolator 41 are provided between optical waveguides 11, 12. The first lens 31 is arranged between one side of optical waveguide 11 and the optical branching device 21, the second lens 32 is arranged between the optical branching device 21 and an independent type optical isolator 41, the third lens 33 is arranged between the independent type optical isolator 41 and the wavelength demultiplexer/multiplexer 22, and the fourth lens 34 is arranged between the wavelength demultiplexer/multiplexer 22 and the other side of optical waveguide 12, respectively. One side of optical waveguide 11 is provided with a first optical fiber 11a and a second optical fiber 11b, and the other side of optical waveguide 12 is provided with a first optical fiber 12a and a second optical fiber 12b. |
