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.times.10.sup.-6/K or less in expansion-coefficient absolute value between the polarization-maintaining optical fiber and the cylindrical member.

 
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> Compensated variable optical attenuator

~ 00499