| 摘要 |
PROBLEM TO BE SOLVED: To realize optical coupling with high efficiency while reluxing the manufacturing allowance for the layer thickness of core layers. SOLUTION: This coupler consists of laminated plural ARROW type optical waveguides 2, 3. In this device, a coupling layer 7 having a different refractive index from the refractive index of the core layers 21, 31, from the refractive index of second clad layers 23, 33, and from the refractive index of the first clad layers 22, 32 is formed in the coupling region 6 between the ARROW type optical waveguides 2, 3. |
