【The 3nd Science Salon】 ～Next Generation Photonics and Multimedia Technologies～

Title:

Elemental technologies for autostereoscopic displays in the next generation: time-division multiplexing and interleaved lenses

Speaker: 

Assoc. Prof. Hideki Kakeya, University of Tsukuba

Abstract:

Most current autostereoscopic displays use spatial multiplexing such as lenticular lens based technology, which reduces spatial resolution of presented images, while time-division multiplexing makes it possible to present high-resolution stereoscopic images. This talk covers time-division parallax barrier and time-division directional backlight technologies as the examples of time-multiplexing. In addition, the detail of interleaved Fresnel lens used to realize directional backlight is explained and its application to 3D aerial image generation is described.

Speech Title:  

FMCW LiDAR incorporating slow light grating beam scanners

Speaker:     

Prof. Toshihiko Baba, Yokohama National University

Abstract:

LiDAR, a 3D image sensor, which is attracting attention along with autonomous driving, uses a mechanical optical beam scanner. Recently, non-mechanical scanners such as OPA and FPA fabricated using Si photonics have been developed for more compact, fast LiDAR. On the other hand, we have developed a non-mechanical LiDAR incorporating a photonic crystal waveguide slow-light diffraction grating. In this presentation, we demonstrate 154×32=4928 point cloud images, real-time operation, and velocity imaging. 100 m class distance measurement is expected due to loss reduction and noise suppression.

Speech Title:

Silicon Phonics Hybrid Wavelength Tunable Laser Diode

Speaker:   

Prof. Tomohiro Kita, Waseda University

Abstract:

Silicon photonics hybrid wavelength tunable lasers diode can achieve high performance by effectively combining a compound semiconductor optical amplifier chip with high light emission efficiency and a silicon photonics chip with excellent controllability of light waves in a small photonic lightwave circuit. In this presentation, I will introduce a laser light source for application to large-capacity optical communication such as digital coherent optical communication and radio over fiber communication, and a LiDAR for application to autonomous driving.

Speech Title:

Broadband photonic transceiver using heterogeneous material integration technology

Speaker:    

Prof. Nobuhiko Nishiyama, Tokyo Institute of Technology

Abstract:

Toward the realization of future low-power, multi-terabit ultra-wideband optical transceivers, the current status and fabrication technology of photonic circuits based on heterogeneous material integration technology, which enables the use of different materials in suitable situations, will be described. The electronic circuits to operate such devices and applications will also be reviewed.

Speech Title:  

Advances in quantum dot lasers for silicon photonics

Speaker:     

Prof. Yasuhiko Arakawa, The University of Tokyo

Abstract:

Quantum dot laser is the ultimate semiconductor laser having temperature-independent threshold current and zero linewidth enhancement factor. In this presentation, we discuss the progress of quantum dot lasers to date and show their future development as innovative light sources, focusing on silicon photonics. In addition, the application of quantum dots toward quantum technologies such as single-photon sources is also briefly discussed.