Abstract
ion-exchanged channel waveguide amplifiers have been fabricated in codoped acid-resistant aluminum germanate (NMAG) glasses. The Judd–Ofelt parameters indicate high asymmetry and strong covalent environment in the glass substrates. The optical gain and the relative gain (the signal enhancement) of a long waveguide amplifier were measured to be 9.10 and , respectively, and after compensating both the propagation loss and the absorption loss, a maximum internal gain of at was obtained, which reveals the successful employment of the thermal ion-exchange technology on the low phonon energy glasses. Based on this work, ion-exchanged , , and doped NMAG glass waveguides will bring surprises in developing O-, S- and U-band waveguide amplifiers, infrared UV-writing grating waveguide lasers, and compact integrated optical devices.
© 2009 Optical Society of America
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