Patent ID: 8182159

Claim:
An optical device comprising: a first retaining sleeve having a first capillary tube retained therein, the first capillary tube having an optical fiber inserted thereinto and fixed thereto; a second retaining sleeve having a second capillary tube retained therein, the second capillary tube having an optical fiber inserted thereinto and fixed thereto; and a lens assembly which includes a first lens and a second lens each of which has one end surface provided with a spherical portion, an optical functional component, and an accommodation sleeve for accommodating the optical functional component; wherein the first lens is fixed to the accommodation sleeve with the spherical surface portion of the first lens abutted on a one end-side opening edge portion of the accommodation sleeve; wherein the second lens is fixed to the accommodation sleeve with the spherical surface portion of the second lens abutted on an another end-side opening edge portion of the accommodation sleeve; and wherein an end surface of the first retaining sleeve is fixed to one end surface of the accommodation sleeve, and an end surface of the second retaining sleeve is fixed to the other end surface of the accommodation sleeve.