Investigation On Properties Of Gained Waveguides & Photo-written Waveguides

The properties of ErJ+ doped glass waveguides,broad band photo-luminescence of LiF film waveguides and photo-written waveguides were investigated in this thesis. The results are as follows:1. Silica glass is a kind of traditional Er doped matrix. 3.5 cm long and 4um wide channel silica glass waveguide was fabricated by Ag+-Na+ ion-exchange and 5 dB net gain at 1536 nm was obtained with a pump power of 250 mW (at 980 wavelength);FWHM is 14 nm around 1536 nm.2. Planar waveguides with low losses were fabricated in Er doped phosphate glasses. Luminescence properties of the waveguides were studied. It shows that the ion-exchange processes did not affect the spectroscopic properties. So Er doped phosphate glasses are good materials for making EDWA,but the channel waveguides are not easy to be made.3. Polycrystalline LiF thin films were grown by thermal evaporation on amorphous substrates. Properties of broad band photo-luminescence at room temperature of active channel (F2 and Fa+) produced by electron beam irradiation were studied. It shows that the active channel with sizeable optical gain and a substantial increase of the refractive index are promising for the realization of active waveguide tunable laser.4. By means of phase mask technology,1) FBGs with reflectivity of 20% and 99% were written into standard communication fibers and special germanium doped fibers,respectively. 2) Array of five FBGs,with a peak separation of 0.88 nm,were written into the same 3M fiber in different positions through stretching the fiber,in the first time. 3) Planar gratings of germanium doped glass and sol-gel glass waveguides were written by means of UV beam,the period of the gratings is 535.5 nm.5. Optical waveguides and micro-mirrors were successfully induced inside fused silica glass and K9 glass,respectively,by focusing femto-second pulse laser. The change of refractive index was determined to be 0.001 to 0.008 in the fused silica glass and 0.006 in the K9 glass. The physical mechanism of the writing process was discussed.