| 摘要 |
An acoustooptic device (10, 48) for modulating the phase of light travelling in an optical fiber (20, 22). A piezoelectric transducer (26, 28, 30) is mounted adjacent the fiber cladding (22) such that vibration of the transducer (26, 28, 30) will launch a phase-modulating bulk acoustic wave toward the core (20) of the fiber (12, 12a). The acoustic impedances of the transducers (26, 28, 30) and the fiber (20, 22) are matched to optimize transfer of wave energy and phase control. A plurality of transducers (60, 62, 64, 66, 68, 70, 72, 74, 76, 78, 80, 82, 84) regularly spaced by one beat length and driven by a three-phase sinusoid, from a frequency shifter (59). |
