| 摘要 |
PROBLEM TO BE SOLVED: To provide an optical device in which signal loss and the reduction in the amount of light reflection attenuation in an optical attenuator can be suppressed.SOLUTION: An optical device 100 includes a first lens 20, a second lens 24 which is disposed at the rear of a focus 51 of the first lens 20 and is optically coupled with the first lens 20, and an optical attenuator 22 which is disposed on an optical path between the first lens 20 and the second lens 24 and changes the quantity of input light passing therethrough. The optical attenuator 22 is disposed in a position where an optical signal is converged, at the rear of the first lens 20, so that the optical signal can be prevented from being shielded by a wall surface of the optical attenuator 22. |
