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Author

Yuta Ozaki

Bio: Yuta Ozaki is an academic researcher from Tokyo University of Agriculture and Technology. The author has contributed to research in topics: Brillouin scattering & Brillouin zone. The author has an hindex of 2, co-authored 4 publications receiving 9 citations.

Papers
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Journal ArticleDOI
TL;DR: In this paper, the authors measured the change in Brillouin frequency shift (BFS) in an optical fiber with virtually controlled sensitivity based on the Vernier effect using a multimode pump and probe light.
Abstract: We propose measuring the change in Brillouin frequency shift (BFS) in an optical fiber with virtually controlled sensitivity based on the Vernier effect using a multimode pump and probe light We measure BFS from the envelope curve of the spectra for multimode Stokes light without scanning the probe frequency The sensitivity of BFS is virtually controlled by changing the difference in the mode spacing between the pump and the probe It is experimentally demonstrated that the virtual sensitivity is controlled from −11 to 11 GHz/K, the maximum value of which is 1,100 times higher than the standard BFS of 1 MHz/K

10 citations

Proceedings ArticleDOI
24 Sep 2018
Abstract: Scanless Brillouin gain spectrum measurement is demonstrated using multimode pump and probe lights along with multi-heterodyne detection. Brillouin frequency shift in a test fiber is successfully measured with a sensitivity of 11 MHz/K.

2 citations

Proceedings ArticleDOI
16 May 2019
TL;DR: A strain measurement of an optical fiber using multimode stimulated Brillouin scattering is experimentally demonstrated, which shows sensitivity more than 1,000 times higher than the conventional methods based on single mode light.
Abstract: A strain measurement of an optical fiber using multimode stimulated Brillouin scattering is experimentally demonstrated, which shows sensitivity more than 1,000 times higher than the conventional methods based on single mode light.

1 citations

Proceedings ArticleDOI
14 May 2017
TL;DR: In this paper, a method for measuring the change in Brillouin frequency shift in an optical fiber with high sensitivity using multispectral pump and probe was proposed and demonstrated.
Abstract: We propose and demonstrate a novel method for measuring the change in Brillouin frequency shift in an optical fiber with high sensitivity using multispectral pump and probe. Experimental result shows 600 times sensitivity enhancement.

Cited by
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Journal ArticleDOI
TL;DR: In this article , a distributed fiber sensor capable of discriminating between temperature and strain while performing low-noise, dynamic measurements is presented. But the performance of this sensor is limited by the fact that it requires the use of a single-mode fiber with 5 m spatial resolution.
Abstract: We present a distributed fiber sensor capable of discriminating between temperature and strain while performing low-noise, dynamic measurements. This was achieved by leveraging recent advances in Brillouin and Rayleigh based fiber sensors. In particular, we designed a hybrid sensor that combines a slope-assisted Brillouin optical time domain analysis system with a Rayleigh-scattering-based frequency scanning optical time domain reflectometry system. These sub-systems combine state-of-the-art sensitivity with the ability to perform both dynamic and quasi-static measurements. This enabled a hybrid system capable of temperature/strain discrimination with a quasi-static temperature resolution of 16 m°C and a strain resolution of 140 nɛ along 500 m of single mode fiber with 5 m spatial resolution. In contrast to previously reported techniques, this approach also enabled dynamic measurements with a bandwidth of 1.7 kHz and temperature (strain) noise spectral density of 0.54 m°C/√Hz (4.5 nɛ/√Hz) while temperature/strain cross-sensitivity was suppressed by at least 25 dB. This represents a dramatic improvement in measurement speed and sensitivity compared with existing techniques capable of temperature/strain discrimination in standard single mode fiber.

3 citations

Proceedings ArticleDOI
10 May 2020
TL;DR: In this article, the authors propose and experimentally demonstrate Brillouin optical time domain analysis using spectrally reshaped multimode pump and probe light, which amplifies the probe light in proportion to the change in amount of optical frequency shift.
Abstract: We propose and experimentally demonstrate Brillouin optical time domain analysis using spectrally reshaped multimode pump and probe light, which amplifies the probe light in proportion to the change in amount of Brillouin frequency shift.

2 citations

Journal ArticleDOI
TL;DR: In this article , a slope-assisted Brillouin optical time domain analysis (SA-BOTDA) was proposed with virtual BGS generated by a multifrequency pump and probe.
Abstract: We propose slope-assisted Brillouin optical time domain analysis (SA-BOTDA) with virtual Brillouin gain spectrum (BGS) generated by a multifrequency pump and probe. The virtual BGS having a wide linear slope region of 100 MHz is easily generated by employing a time-to-space spectral shaping technique that has been originally developed for generating short optical pulses. We demonstrate the distribution of virtual BGS realized by using five spectral components of pump and probe.

2 citations

Journal ArticleDOI
01 Feb 2023-Sensors
TL;DR: In this paper , a simple theoretical formalism describing SBS interaction between two individual optical modes selectively excited in an acoustically isotropic multimode optical fiber was presented, and an analytical expression for the spatial distribution of the sound field amplitude in the fiber core and explored the features of SBS gain spectra, describing the interaction between modes of different orders.
Abstract: A multimode optical fiber supports excitation and propagation of a pure single optical mode, i.e., the field pattern that satisfies the boundary conditions and does not change along the fiber. When two counterpropagating pure optical modes are excited, they could interact through the stimulated Brillouin scattering (SBS) process. Here, we present a simple theoretical formalism describing SBS interaction between two individual optical modes selectively excited in an acoustically isotropic multimode optical fiber. Employing a weakly guiding step-index fiber approach, we have built an analytical expression for the spatial distribution of the sound field amplitude in the fiber core and explored the features of SBS gain spectra, describing the interaction between modes of different orders. In this way, we give a clear insight into the sound propagation effects accompanying SBS in multimode optical fibers, and demonstrate their specific contributions to the SBS gain spectrum.

2 citations

Proceedings ArticleDOI
24 Sep 2018
Abstract: Scanless Brillouin gain spectrum measurement is demonstrated using multimode pump and probe lights along with multi-heterodyne detection. Brillouin frequency shift in a test fiber is successfully measured with a sensitivity of 11 MHz/K.

2 citations