Photosensitivity in optical fiber waveguides: Application to reflection filter fabrication

Key Points

• This research aims to explore the photosensitivity in Ge-doped optical fibers and its application in fabricating narrowband reflectors.
• Investigation of light-induced refractive-index changes in Ge-doped core optical fibers.
• Fabrication of narrowband reflectors using the observed photosensitivity.
• Application of DFB reflectors as laser mirrors in a continuous-wave gas laser.
• Demonstrated significant light-induced refractive-index changes in Ge-doped fibers.
• Successfully fabricated narrowband reflection filters for optical applications.
• Revealed effective use of DFB reflectors in visible light laser systems.