> AIST > Research Division > Electronics and Photonics Research Institute > Our Research

Photonics Systems Group

Group Outline and Primary Goal

We promote research and development of dynamic optical path network, that increases energy efficiency of the Internet by more than 1,000 times and that will surely be fundamental to the future information technology.
Leading VICTORIES (Vertically Integrated Center for Technologies of Optical Routing toward Ideal Energy Savings) sponsored by the Ministry of Education, Culture, Sports, Science and Technology, we strongly advance the research of optical and quantum transmission technology, wavelength cross connect technology, and optical path network control technology. Thus we contribute to create an entirely new technology which can handle a massive amount of data on networks with significantly lower energy consumption. We also pursue research on the innovative technologies such as tele-coexistence by ultra-high-definition real-time video data, and a new computing technology for big data processing through networks.

Key Themes of Research

  • Optical and quantum transmission technologies utilizing optical parametric processes
  • Development of multiple input and output large scale wavelength cross-connects
  • Study of dynamic optical path network using a large scale test bed

Fig.1  10-dB nonlinear threshold increase in 12 Gbaud 16QAM WDM transmission.


Fig.2  NxN-wavelength cross-connection board for fiber arrays

Fig.3  Test bed of a dynamic optical path network with a capacity of 90 Tbps.

Fig.4  A remote music session with 8K Super Hi-Vision between Tokyo and Tsukuba using the test bed.

Our Technologies and Equipment

  • Optical and quantum signal processing based on nonlinear and quantum optics
  • Digital coherent transmission technologies exploiting advanced modulation formats
  • Multi-port wavelength cross-connect based on the original beam steering technique
  • Design and operation of dynamic optical path network with a capacity of 90 Tbps and energy consumption of 6 kW


・K. Tanizawa, K. Suzuki, K. Ikeda, S. Namiki, and H. Kawashima, "Non-duplicate polarization-diversity 8 x 8 Si-wire PILOSS switch integrated with polarization splitter-rotators," Opt. Express 25, 10885-10892 (2017).
・K. Suzuki, K. Tanizawa, S. Suda, H. Matsuura, T. Inoue, K. Ikeda, S. Namiki, and H. Kawashima, “Broadband silicon photonics 8 × 8 switch based on double-Mach–Zehnder element switches,” Opt. Express 25, 7538-7546 (2017).
・K. Tanizawa, K. Suzuki, K. Ikeda, S. Namiki, and H. Kawashima, “Novel polarization diversity without switch duplication of a Si-wire PILOSS optical switch,” Opt. Express 24, 6861-6868 (2016).
・K. Suzuki, K. Tanizawa, S. H. Kim, S. Suda, G. Cong, K. Ikeda, S. Namiki, H. Kawashima, “Polarization-Rotator-Free Polarization-Diversity 4×4 Si-Wire Optical Switch,” IEEE Photon. J. 8, 600707 (2016).
・K. Tanizawa, K. Suzuki, S. Suda, K. Ishii, J. Kurumida, G. Cong, T. Inoue, K. Ikeda, S. Namiki, H. Kawashima, “Off-Chip Polarization-Diversity 4×4 Si-Wire Optical Switch with Digital DGD Compensation,” IEEE Photon. Technol. Lett. 28, 457-460 (2016).

・Y. Atsumi, T. Yoshida, E. Omoda, and Y. Sakakibara, "Broad-band surface optical coupler based on a SiO2-capped vertically curved silicon waveguide," Opt. Express 26, 10400-10407 (2018)
・T. Amano, S. Ukita, Y. Egashira, M. Sasaki, A. Noriki, M. Mori, K. Kurata, and Y. Sakakibara, “25-Gb/s Operation of a Polymer Optical Waveguide on an Electrical Hybrid LSI Package Substrate With Optical Card Edge Connector,” J. Lightwave Technol. 34, 3006-3011 (2016).
・A. Noriki, T. Amano, D. Shimura, Y. Onawa, H. Sasaki, H. Yaegashi, K. Yamada, H. Nishi, T. Tsuchizawa, and M. Mori, “Mirror-based polarization-insensitive broadband vertical optical coupling for Si waveguide,” Jpn. J. Appl. Phys. 56, 090302 (2017).

・K. Solis-Trapala et al., "Optimized WDM Transmission Impairment Mitigation by Multiple Phase Conjugations", J. Lightw. Technol., vol. 34, no.2, pp. 431-440 (2016).
・S. Namiki et al., "Multi-Channel Cascadable Parametric Signal Processing for Wavelength Conversion and Nonlinearity Compensation", J. Lightw. Technol., vol. 35, no. 4, pp. 815-823 (2017).

・H. Tsuchida,"Optical fibre chromatic dispersion measurement using incoherent heterodyne interferometry", Electron. Lett., vol. 52, no. 8, pp. 645-646 (2016).
・H. Tsuchida, “Waveform measurement technique for phase/frequency-modulated lights based on self-heterodyne interferometry," Opt. Express, vol. 25, no. 5, pp. 4793-4799 (2017).  

Back to Top

Electronics and Photonics Research Institute

Tsukuba Central 2, 1-1-1 Umezono, Tsukuba, Ibaraki 305-8568 JAPAN
phone: +81-29-861-3490  fax: +81-29-861-5627