Activities
Publications since April 2016
(Ryu Lab has started research on April 2016.)
Previous publicaions of Shiro Ryu can be found here.
Academic JournalOptical wireless communication technology
1. K. Nagase and S. Ryu, "A Study on the application of MIMO technology in optical wireless communications (in Japanese)," IEICE Trans. Comm. B, Vol. J105-B, No. 7, pp. 515-516, July 2022.
2. S. Ryu, "Application of angle diversity technique to optical wireless communication systems for smartphones," Acta Materialia Turcica, Vol. 4, No. 1, pp. 1-8, June 2020.
Optical measurement technology using coherent heterodyne detection and digital signal processing
1. S. Ryu,“Continuous time-domain measurement method of Rayleigh backscattered light with coherent detection, “IEEE Photonics Technology Letters, Vol. 35, No. 9, pp. 497-500, May 2023.
International Conference
Optical wireless communication technology
1. K. Seitaibashi and S. Ryu, “Carrier-phase estimation techniques for MIMO optical wireless communication systems,” OECC2023, OECC2023-0320-30, Shanghai, China, July 2023.
2. J. Kishi and S. Ryu, "Study on angle diversity receiving system for visible light communications," ACP2018, paper S4D.6, Hangzhou, China, October 2018.
3. H. Ando and S. Ryu, "Simultaneous dual data stream transmission using RGB and phosphor-based white LEDs," ACP2018, paper M3D.6, Hangzhou, China, October 2018.
4. S. Ryu, "(Invited talk) Application of angle diversity technique to optical wireless communication systems for smartphones," Interphotonics 2018, Antalya, Turkey, October 2018.
5. S. Ryu, "Study on diversity receiving techniques in optical wireless communication systems," 2017 Conference on Lasers and Electro-Optics Pacific Rim (CLEO-PR), P4-008, 2017.
Optical measurement technology using coherent heterodyne detection and digital signal processin
1. S. Ryu, "[Plenary talk] History of coherent optical communication system technology–implications for young researchers from research and development experience," 3rd International Conference and Expo on Lasers, Optics & Photonics, Edinburgh, UK, October 2024.
2. S. Ryu, "Optical delay interferometer system for the measurement of optical phase noise and polarization fluctuation" ECOC2024, paper W2A.106, Frankfurt, Germany, September 2024.
3. S. Ryu, "Phase noise measurement with delay interferometer during fast polarization fluctuation,” CLEO-PR 2024 (16th Pacific Rim Conference on Lasers and Electro-Optics), paper Tu1E-4, Incheon, Korea, August 2024.
4. S. Ryu, "Optical phase noise and polarization fluctuation measurement with delay interferometer," CLEO2023, paper JTu2A.60, San Jose, CA, May 9, 2023.
5. S. Ryu, "[Keynote speech] Optical time domain reflectometry for continuous time-domain measurement of Rayleigh backscattered light," Optics-Laser 2023, London, UK, March 27, 2023.
6. N. Takei and S. Ryu, "Dynamic measurement of fiber-birefringence spatial distribution by coherent heterodyne detection of Rayleigh backscattered light," CLEO 2021, paper SM1E.7, May 2021.
7. N. Takei and S. Ryu, "Rapid measurement of spatial distribution of birefringence in optical fibers by coherent heterodyne detection of Rayleigh backscattered light," CLEO Pacific Rim 2020, Concurrent 10F, August 2020.
8. N. Takei and S. Ryu, "Novel measurement method of fiber-birefringence spatial distribution by coherent heterodyne detection of Rayleigh backscattered light," CLEO 2020, paper SF3P.3, May 2020.
9. S. Ryu, "(Invited talk) Novel optical time/frequency domain reflectometry capable of continuous time-domain measurement of Rayleigh backscattered light," Interphotonics 2019, Antalya, Turkey, November 2019.
10. S. Ryu, T. Tsuboya, H. Murata, and D. Fukushima, "Novel optical time domain reflectometry with continuous time-domain measurement of backscattered light, OECC/PSC 2019, paper WP4-C4, Fukuoka, Japan, July 2019.
11. S. Nozawa and S. Ryu, "Investigation of optical phase characteristics of Stokes and transmitted light in fiber Brillouin scattering," OFC2019, paper M4C.1, San Diego, CA, March 2019.
Technical Committee Meeting
Optical wireless communication technology
1. R. Murakami and S. Ryu, "Signal phase recovery using digital signal processing in optical wireless communication systems (in Japanese)," Technical Committee on Optical Communicatin Systems, IEICE, OCS2022-21, October 2022.
2. K. Seitaibashi and S. Ryu, "Study of MIMO optical wireless communication system using maximum likelihood estimation (in Japanese)," Technical Committee on Optical Communicatin Systems, IEICE, OCS2022-20, October 2022.
3. S. Ryu, "Study on two-dimensional signal-to-noise ratio distribution in optical wireless communications (in Japanese)," Technical Committee on Optical Communicatin Systems, IEICE, OCS2017-63, Osaka, November 2017.
Optical measurement technology using coherent heterodyne detection and digital signal processing
1. Y. Katsumata and S. Ryu, "Simultaneous measurement of chromatic dispersion and nonlinear coefficient using phase-modulated light (in Japanese)," IEICE, OFT2024-98, Osaka, January 2025.
2. Y. Katsumata and S. Ryu, "Measurement of optical phase noise using differential phase (in Japanese)," IEICE, OFT2024-40, Tokyo, October 2024.
3. S. Ryu, "Optical phase noise measurement method using optical delay interferometer under polarization fluctuation environment (in Japanese), IEICE, OFT2024-28,Sapporo, August 2024.
4. S. Ryu, "Continuous time-domain measurement method of Rayleigh backscattered light," Technical Committee on Optical Fiber Technologies (in Japanese), IEICE, OFT2023-13, Obihiro, August 2023.
5. S. Ryu, "[Tutorial invited lecture] Coherent optical communication technology and my research life," Technical Committee on Optical Fiber Technologies (in Japanese), IEICE, OFT2021-48, October 2021.
6. S. Ryu and T. Tsuboya, "A method for continuously measuring backscattered light at an arbitrary point on an optical fiber," Technical Committee on Optical Fiber Technologies (in Japanese), IEICE, OFT2021-14, August 2021.
7. T. Tsuboya and S. Ryu, "Optical time/frequency domain reflectometry for continuous time-domain measurement of Rayleigh backscattered light," Technical Committee on Optical Fiber Technologies (in Japanese), IEICE, OFT2020-35, October 2020.
8. S. Nozawa and S. Ryu, "Theoretical study of fiber Brillouin scattering using FDTD method," Technical Committee on Optical Fiber Technologies (in Japanese), IEICE, OFT2020-26, October 2020.
9. N. Takei and S. Ryu, "Measurement of spatial distribution of fiber birefringence by coherent heterodyne detection of Rayleigth backscattered light," Technical Committee on Optical Fiber Technologies (in Japanese), IEICE, OFT2020-25, October 2020.
10. Nozawa and S. Ryu, "Study of optical phase characteristics of Stokes and transmitted light in fiber Brillouin scattering," Technical Committee on Optical Fiber Technologies (in Japanese), IEICE, OFT2019-28, Kushiro, August 2019.
SDN technology
1. J. Tomaki and S. Ryu, "Dynamic rerouting experiments by cooperation of SDN and optical wireless communication," Technical Committee on Optical Communicatin Systems (in Japanese)," OCS2019-25, Kushiro, August 2019.
Nanional Convention
Optical wireless communication technology
1. K. Seitabashi and S. Ryu, "MIMO optical wireless communication system using symbol-by-symbol phase compensation (in Japanese)," IEICE Convention Record, B-10-10, Nagoya, September 2023.
2. R. Murakami and S. Ryu, "Study on phase synchronization technique in optical wireless communication system (in Japanese)," IEICE Convention Record, B-10-33, March 2023.
3. K. Seitabashi and S. Ryu, "MIMO optical wireless communication system using QRM-MLD (in Japanese)," IEICE Convention Record, B-10-32, March 2023.
4. K. Seitabashi and S. Ryu, "Optical wireless communication system using multi-value modulation (in Japanese)," IEICE Convention Record, B-10-13, September 2022.
5. R. Murakami and S. Ryu, "Optical wireless communication system using multi-value modulation (in Japanese)," IEICE Convention Record, B-10-16, March 2022.
6. K. Nagase and S. Ryu, "Study of MIMO optical wireless communication system with non-imaging lens (in Japanese)," IEICE Convention Record, B-10-14, March 2022.
7. K. Nagase and S. Ryu, "A Study on MIMO optical wireless communication system using non-imaging lenses (in Japanese)," IEICE Convention Record, B-10-30,September 2021.
8. K. Nagase and S. Ryu, "A Study on the application of MIMO technology in optical wireless communications (in Japanese)," IEICE Convention Record, B-10-37, March 2021.
9. J. Tomaki and S. Ryu, "A study on MIMO technology with wavelength-division multiplexing in optical wireless communications (in Japanese)," IEICE Convention Record, B-10-36, March 2021.
10. J. Kishi and S. Ryu, "A study on angle diversity optical receiver for visible light communications (in Japanese)," IEICE Convention Record, B-10-21, March 2020.
11. K. Nagase and S. Ryu, "A study on diversity receiving system for visible light communications (in Japanese)," IEICE Convention Record, B-10-20, March 2020.
12. H. Ando and S. Ryu, "A study on simultaneous dual data stream transmission using OFDM modulation (in Japanese)," IEICE Convention Record, B-10-13, Tokyo, March 2019.
13. J. Kishi and S. Ryu, "A study on angle diversity system for visible light communications (in Japanise)," IEICE Convention Record, B-10-14, Tokyo, March 2019.
14. J. Kishi and S. Ryu, "A study on angle diversity reception method for visible light communications (in Japanise)," IEICE Convention Record, B-10-23, Kanazawa, September 2018.
15. J. Tomaki, S. Shinoda, and S. Ryu, "Optical receiver for optical wireless communication using LED as light receiving device (in Japanese)," IEICE Convention Record, B-10-24, Kanazawa, September 2018.
16. H. Ando and S. Ryu, "A study on simultaneous dual data stream transmission using RGB LED (in Japanese)," IEICE Convention Record, B-10-25, Kanazawa, September 2018.
17. S. Shinoda, H. Ando, and S. Ryu, "Ethernet data transmission experiment using optical wireless communication (in Japanese)," IEICE Convention Record, B-10-26, Kanazawa, September 2018.
18. S. Ryu, "Study on two-dimensional signal-to-noise ratio distribution in optical wireless communications (in Japanese)," IEICE Convention Record, B-10-49, Tokyo, September 2017.
19. H. Ando and S. Ryu, "Optimization of transmitter design in optical wireless communications (in Japanese)," IEICE Convention Record, B-10-48, Tokyo, September 2017.
20. S. Ryu, "Study on diversity receiving systems in optical wireless communications (in Japanese)," IEICE Convention Record, B-10-60, Nagoya, March 2017.
Optical measurement technology using coherent heterodyne detection and digital signal processing
1. S. Ryu, "Optical phase noise measurement with optical delay interferometer during polarization fluctuation (in Japanese), IEICE Convention Record, B-10B-06, September 2024.
2. Y. Katsumata and S. Ryu, "Measurement of optical phase noise using differential phase (in Japanese)," IEICE Convention Record, B-10B-34, March 2024.
3. S. Ryu, "Polarization fluctuation measurement with optical delay interferometer (in Japanese)," IEICE Convention Record, B-10-46, Nagoya, September 2023.
4. N. Takei and S. Ryu, "Measurement of dynamic fluctuation characteristics of optical fiber local birefringence using coherent heterodyne detection (in Japanese)," The 82nd JSAP Fall Meeting 2021, 11a-N106-9, September 2021.
5. N. Takei and S. Ryu, "Measurement of fiber local-birefringence fluctuation for external stress (in Japanese)," The 68th JSAP Spring Meeting 2021, 17a-Z08-2, March 2021.
6. T. Tsuboya and S. Ryu, "A Study on digital signal processing for the phase of Rayleigh backscattered light (in Japanese)," IEICE Convention Record, B-13-4, March 2021.
7. T. Tsuboya and S. Ryu, "Time-domain continuous phase fluctuation measurement for backscattered light in optical fibers (in Japanese)," IEICE Convention Record, B-13-6, September 2020.
8. N. Takei and S. Ryu, "Measurement method of spatial distribution of birefringence in optical fibers by coherent heterodyne detection (in Japanese)," The 81st JSAP Fall Meeting 2020, 8p-Z19-22, September 2020.
9. N. Takei and S. Ryu, "Method of birefringence measurement by phase measurement of backscattered light using coherent heterodyne detection (in Japanese)," The 67th JSAP Spring Meeting 2020, 12p-B406-2, March 2020.
10. N. Takei and S. Ryu, "Analysis of phase characteristics of backscattered light using coherent heterodyne detection (in Japanese)," IEICE Convention Record, B-13-33, Osaka, September 2019.
11. S. Nozawa and S. Ryu, "Vibration measurement of optical fiber using Brillouin frequency shift (in Japanese)," IEICE Convention Record, B-13-34, Osaka, September 2019.
12. S. Nozawa and S. Ryu, "Study of optical phase characteristics of Stokes light in Brillouin scattering (in Japanese)," IEICE Convention Record, B-13-17, Tokyo, March 2019.
13. T. Tsuboya, H. Murata, D. Fukushima, and S. Ryu, "Phase fluctuation measurement in continuous measurement method of optical fiber backscattered light (in Japanese)," IEICE Convention Record, B-13-13, Tokyo, March 2019.
14. H. Murata, T. Tsuboya, D. Fukushima, and S. Ryu, "Frequency sweep light generation in continuous measurement method of optical fiber backscattered light (in Japanese)," IEICE Convention Record, B-13-14, Tokyo, March 2019.
15. S. Nozawa and S. Ryu, "Phase noise measurement of optical signal using coherent heterodyne detection technique (in Japanese)," IEICE Convention Record, B-10-53, Kanazawa, September 2018.
SDN technology
1. J. Tomaki and S. Ryu, "Dynamic routing by cooperation of SDN and optical wireless communication (in Japanese)," EICE Convention Record, B-12-4, September 2019.
2. J. Tomaki, S. Shinoda, and S. Ryu, "Dynamic routing by cooperation of SDN and quality measurement of optical wireless signal (in Japanese)," IEICE Convention Record, B-12-11, Tokyo, March 2019.
3. A. Horiguchi and S. Ryu, "Dynamic routing using SDN technology and packet statistics (in Japanise)," IEICE Convention Record, B-6-30, Kanazawa, September 2018.
Ryu Laboratory
School of Interdisciplinary Mathematical Sciences
Meiji University
Room 1207, 1208
4-21-1, Nakano, Nakano-ku
Tokyo 164-8525, Japan
