| 摘要 |
PURPOSE: To reduce the near-end crosstalk by installing, e.g. wedge which is plated to suppress the reflection of light in a module case facing a light receiving element and absorbing stray light components, and reflecting unabsorbed stray light components in a direction wherein they are not received by the light receiving element. CONSTITUTION: The converged output light from a light emitting element 2 is transmitted through an optical separation filter 11 and inputted to an optical fiber 10. Since the optical separation filter 11 can not transmit the light completely, a part of the output light of a light emitting element 2a is reflected. The reflected light travels as a stray light component from the optical separation filter 11 toward the wedge 24. The stray light component is diverged by a cavity since the optical separation filter 11 and wedge 24 are at a distance. Consequently, the stray light component is reducible. A stray light component which can not be absorbed by the plating of the wedge 24 is reflected to the outside of a module case 1 while diverged to impinge on the partition wall 25. The stray light component is absorbed here as well. |
