Waveguide-Type Acousto-Optic Frequency Shifter driven by Surface Acoustic Wave and its Application to Frequency-Shifted Feedback Fiber Laser

摘要

A waveguide-type acousto-optic frequency shifter (AOFS) driven by surface acoustic wave in a tapered crossed-channel proton-exchanged optical waveguide in a 128° rotated Y-cut LiNbO{sub}3 was realized at an optical wavelength of 1.55μm. The AOFS was incorporated into a module and connected to the input and output fibers optically. A 35% diffraction efficiency and 10% through put were obtained at an input voltage of 10 V{sub}(rms). The frequency-shifted feedback laser oscillation with the module was obtained and an oscillation, spectral width of 0.62 nm and a beat frequency spectral width of 12 kHz were demonstrated.