HERMETIC SEAL DEVICE FOR POLARIZATION-MAINTAINING OPTICAL FIBER AND HERMETIC SEAL PARTITION

Abstract

A hermetic seal device for a polarization-maintaining optical fiber is provided. The hermetic seal device includes a polarization-maintaining optical fiber and a cylindrical member to be inserted by the polarization-maintaining optical fiber, where the cylindrical member has the difference 3×10−6/K or less in expansion-coefficient absolute value between the polarization-maintaining optical fiber and the cylindrical member.

Description

BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a sectional view of a hermetic seal device for a polarization-maintaining optical fiber according to an embodiment.

FIG. 2 is a cross-sectional view of a general polarization-maintaining optical fiber.

FIG. 3 is a cross-sectional view of another general polarization-maintaining optical fiber.

FIG. 4 is a sectional view of a hermetic seal device according to another embodiment.

FIG. 5 is a sectional view of a hermetic seal device according to still another embodiment.

FIG. 6 is a sectional view of a partition according to an embodiment.

FIG. 7 is a schematic sectional view of a hermetic seal processing apparatus having the hermetic seal device according to the embodiments mounted thereon.

Claims

1. A hermetic seal device for a polarization-maintaining optical fiber, comprising: a polarization-maintaining optical fiber; anda cylindrical member to be inserted by the polarization-maintaining optical fiber, the cylindrical member having a difference of 3×10−6/K or less in expansion-coefficient absolute value between the polarization-maintaining optical fiber and the cylindrical member.

2. The device according to claim 1, further comprising a resin sealing material provided around the polarization-maintaining optical fiber within the cylindrical member.

3. The device according to claim 2, wherein the resin sealing material includes an epoxy resin.

4. The device according to claim 1, further comprising a low-melting glass sealing material provided around the polarization-maintaining optical fiber within the cylindrical member.

5. The device according to claim 1, wherein the cylindrical member is made of an alloy, a glass material, or a ceramic.

6. A hermetic seal partition, comprising: a polarization-maintaining optical fiber; anda wall member to be inserted by the polarization-maintaining optical fiber, the wall member having a difference of 3×10−6/K or less in expansion-coefficient absolute value between the polarization-maintaining optical fiber and the wall member.