Abstract: An optical apparatus includes: at least one optical component configured to reflect first light that travels in a first direction toward a second direction, transmit second light that travels in the second direction, and generate leaked light traveling in the first direction, the leaked light including a first component transmitted in the first direction in the first light and a second component reflected toward the first direction in the second light; a first processing unit configured to absorb the leaked light, and reflect the leaked light in a predetermined direction; and at least one second processing unit configured to absorb the leaked light coming from the first processing unit.

Abstract: An optical fiber support structure includes: a first portion configured to support an optical fiber including a core wire and a covering surrounding the core wire, the core wire including a core and a cladding; a second portion attached to the first portion; and a relaxing portion that is connected to an end portion of the core wire and that is positioned between the first portion and the second portion, the relaxing portion having a light receiving surface configured to receive light input from a space, an area of the light receiving surface being larger than an area of the end portion of the core wire.

Abstract: A supporting member supports a peeled end portion formed at an end portion in longitudinal direction representing first direction of an optical fiber, the optical fiber including: a core wire including a core and a cladding; and a jacket configured to enclose the core wire, the jacket being removed at the peeled end portion to expose the core wire. The supporting member includes: a first member; a second member fixed to the first member; a housing portion provided between the first member and the second member, the housing portion extending along the peeled end portion and being configured to house the peeled end portion; and a processed member housed in the housing portion and provided around the peeled end portion, the processed member being configured to cause transmission or scattering of light leaking from the peeled end portion.