Synthesis of Rejection Band Profile in Ultrasonically Induced Long-Period Optical Fiber Gratings

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概要

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• An ultrasonically induced long-period fiber grating functions as a tunable optical notch filter, since the pitch of refractive index modulation is changed according to the driving frequency of the ultrasonic vibration propagating along a fiber. In this study, two methods of synthesizing the band profile are investigated experimentally. The first method is to add two signals with different frequencies to excite the ultrasonic vibration, while the other is to switch two signals by frequency shift keying modulation. For both methods, the tunability of the rejection band profile is evaluated with respect to the difference in the two frequencies and the amplitude ratio of the two ultrasonic signals.

• 2006-05-30

著者

• Fukuma Norimichi

  Presicion and Intelligence Laboratory, Tokyo Institute of Technology, 4259 R2-25 Nagatsutacho, Midori-ku, Yokohama 226-8503, Japan

• Nakamura Kentaro

  Presicion and Intelligence Laboratory, Tokyo Institute of Technology, 4259 R2-25 Nagatsutacho, Midori-ku, Yokohama 226-8503, Japan

• Ueha Sadayuki

  Presicion and Intelligence Laboratory, Tokyo Institute of Technology, 4259 R2-25 Nagatsutacho, Midori-ku, Yokohama 226-8503, Japan

関連論文

• Synthesis of Rejection Band Profile in Ultrasonically Induced Long-Period Optical Fiber Gratings

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