Fish & Richardson P.C.
Optoacoustic modulator
 An optoacoustic modulator contains first and second optoacoustic media, to which first and second piezoelectric vibrators are attached respectively. Herein, both of the first and second optoacoustic media are designed in same measurements, wherein they are arranged in series along an optical axis of a light signal in such a way that crystal orientation of the first optoacoustic media differs from crystal orientation of the second optoacoustic media with an angle of inclination of 90.degree.. In addition, the first piezoelectric vibrator is attached to a first surface of the first optoacoustic media which is placed in parallel with the optical axis of the light signal, while the second piezoelectric vibrator is attached to a second surface of the second optoacoustic media which is placed in parallel with the optical axis of the light signal, wherein the first surface is directed perpendicular to the second surface. The light signal, corresponding to incoming light incident on the optoacoustic modulator, is input to the first optoacoustic media. Then, the light signal transmitted through the first optoacoustic media is input to the second optoacoustic media, from which a desired output corresponding to outgoing light is output. The first and second piezoelectric vibrators are controlled by modulation signals, which are independently adjusted to cancel polarization mode dispersions of the optoacoustic media. In addition, it is possible to improve ripple characteristic of loss-wavelength dependency characteristic of the optoacoustic media, while it is possible to reduce an amount of crosstalk that occurs at a high-speed modulation mode. 
Ando Electric Co., Ltd.
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