Diffraction Properties and Beam-Propagation Analysis of Waveguide-Type Acoustooptic Modulator Driven by Surface Acoustic Wave

Kakio, Shoji; Uotani, Shinji; Nakagawa, Yasuhiko; Hara, T.; Ito, Hiromasa; Iizuka, Takashi; Kobayashi, T.; Watanabe, Masayuki

doi:10.1143/jjap.44.4472

Cited by 23 publications

(36 citation statements)

References 8 publications

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“…4. Conguration of waveguide-type AOM [6]. Figure 5 shows the waveguide shape in the diraction region of the waveguide-type AOM.…”

Section: Saw Mode Dependence In Ao Bragg Diractionmentioning

confidence: 99%

Acousto-Optic Modulator Driven by Surface Acoustic Waves

Kakio

2015

Acta Phys. Pol. A

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In this paper, an introduction to the design, fabrication, evaluation, and application of acousto-optic modulators using the Bragg diraction of an optical guided wave in a channel optical waveguide due to a surface acoustic wave is provided. First, the surface acoustic wave mode dependence in the acousto-optic Bragg diraction was discussed by considering the surface acoustic wave power required for the maximum diraction P100 calculated using coupled mode theory and the measured P100 in Ti-diused planar optical waveguides fabricated on LiNbO3 substrates. Next, performances of several devices that the author and the coworkers developed are reviewed. These include a waveguide-type acousto-optic modulator using a tapered crossed-channel proton-exchanged optical waveguide on a 128• -rotated Y -cut LiNbO3 substrate for an optical wavelength of 1.55 µm, a monolithically integrated tandem acousto-optic modulator in which several waveguide-type acousto-optic modulators are connected in tandem on the same substrate, and a waveguide-type acousto-optic modulator in which laser lights of the three primary colors, red, green, and blue, can be modulated by the same modulator at the same driving frequency.

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“…4. Conguration of waveguide-type AOM [6]. Figure 5 shows the waveguide shape in the diraction region of the waveguide-type AOM.…”

Section: Saw Mode Dependence In Ao Bragg Diractionmentioning

confidence: 99%

Acousto-Optic Modulator Driven by Surface Acoustic Waves

Kakio

2015

Acta Phys. Pol. A

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“…The optical field distribution and diffraction property in these waveguide shapes were simulated using a beam-propagation analysis for TM-mode propagation. The simulation conditions using OptiBPM 6.0 of Optiwave Co., Ltd. were the same as those given a previous report [11].…”

Section: B Beam-propagation Analysis Of Tandem Aofsmentioning

confidence: 99%

“…The fabrication conditions of the waveguide were the same as those given in the previous paper [11]. The channel waveguide was fabricated by first forming an RF-sputtered Ta …”

Section: Fabrication Of Tandem Aofsmentioning

confidence: 99%

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4C-3 Monolithically Integrated Tandem Waveguide-Type Acoustooptic Frequency Shifter Driven by Surface Acoustic Waves

Kakio

Uotani

Nakagawa

et al. 2006

2006 IEEE Ultrasonics Symposium

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A waveguide-type acoustooptic frequency shifter (AOFS) using coplanar AO coupling due to a surface acoustic wave (SAW), that is, Bragg diffraction, in a tapered crossedchannel proton-exchanged (PE) optical waveguide on a 128 • -rotated Y-cut LiNbO3 substrate for an optical wavelength of 1.55 µm has been proposed. In this study, a monolithically integrated tandem waveguide-type AOFS driven by SAW was designed and fabricated. The structure considered was a 2×4 optical switch, in which the input ports of two second 1×2 switches were connected to the two output ports of the first 2×2 switch on the same substrate. An interdigital transducer (IDT) with a period length of 32 µm and an overlap length of 2 mm was fabricated in the first and second stages of the AO interaction region. Diffraction efficiency was measured at a driving frequency of approximately 120 MHz. A diffraction efficiency of approximately 90% was obtained for each stage. When both stages were driven at the same frequency, a peak diffraction efficiency of 63% was obtained. Furthermore, the optical frequency shifts for the sum of two driving frequencies and the difference frequency ranging from DC to 5 MHz were observed.

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“…[11][12][13][14][15][16][17] In contrast to collinear devices, the waveguide-type AOM can perform modulation in a wide wavelength range at the same driving frequency. 12) This leads to a difficulty in wavelength-selective processing.…”

Section: Introductionmentioning

confidence: 99%

Simple Simultaneous Modulation for Red, Green, and Blue Laser Lights Using Surface-Acoustic-Wave-Driven Acoustooptic Modulator

Kakio¹,

Shinkai²,

Nakagawa³

2010

Jpn. J. Appl. Phys.

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An acoustooptic modulator (AOM) driven by a surface acoustic wave (SAW), in which laser light of the three primary colors, red, green, and blue (RGB), can be modulated by the same modulator at the same driving frequency, was investigated. To suppress the light power leaked to the outside of the waveguide, a waveguide-type AOM with a 3.5-mm-deep waveguide was fabricated. The RGB laser lights were modulated with the diffraction efficiencies of 73 -85% and a driving SAW power of less than 0.2 W at the same driving frequency of 245.5 MHz. By combining the AOM module, laser sources, WDM couplers, and fiber delay lines, a simple simultaneous modulation for RGB laser lights was proposed and constructed. On the basis of the designed properties, the switching time of the output signal from the constructed system equipped with the AOM with the three-finger-pair interdigital transducer (IDT) was demonstrated to be 28 ns. #

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Diffraction Properties and Beam-Propagation Analysis of Waveguide-Type Acoustooptic Modulator Driven by Surface Acoustic Wave

Cited by 23 publications

References 8 publications

Acousto-Optic Modulator Driven by Surface Acoustic Waves

Acousto-Optic Modulator Driven by Surface Acoustic Waves

4C-3 Monolithically Integrated Tandem Waveguide-Type Acoustooptic Frequency Shifter Driven by Surface Acoustic Waves

Simple Simultaneous Modulation for Red, Green, and Blue Laser Lights Using Surface-Acoustic-Wave-Driven Acoustooptic Modulator

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