Скачать или смотреть IEICE English Webinar : Basics and recent progress in lightwave modulators - Tetsuya Kawanishi

IEICE English Webinar: Distinguished Lecturer Program Series – May 31, 2023

Basics and recent progress in lightwave modulators
Lecturer: Prof. Tetsuya Kawanishi, Waseda University

Biography:
Tetsuya Kawanishi received the B.E., M.E., and Ph.D. degrees in electronics from Kyoto University, Kyoto, Japan, in 1992, 1994, and 1997, respectively. From 1994 to 1995, he was with the Production Engineering Laboratory of Panasonic. During 1997, he was with the Venture Business Laboratory, Kyoto University, where he was engaged in research on electromagnetic scattering and on near-field optics. In 1998, he joined the Communications Research Laboratory, Ministry of Posts and Telecommunications (now the National Institute of Information and Communications Technology, NICT), Tokyo, Japan, where he was the Director of Lightwave Devices Laboratory of NICT. During 2004, he was a Visiting Scholar in the Department of Electrical and Computer Engineering, University of California at San Diego. From 2015, he is a professor of Faculty of Science and Technology, Waseda University, Tokyo, Japan. His current research interests include high-speed optical modulators and RF photonics.

Summary：
The purpose of this webinar is to provide basics of electro-optical modulation which plays an important role in photonic networks such as fiber optic links, visible light communications, and fiber wireless, as well as in high-performance sensing systems. This webinar will offer as an overview of various types of optical modulation devices, focusing on modulators based on the electro-optic effect (Pockels effect), called electro-optic (EO) modulators, which induce optical phase retardation by an electric field applied thoroughly through an electrode. By using optical interferometers based on the EO effect, a variety of functions can be achieved, including phase modulation, intensity modulation, and vector modulation. Mach-Zehnder interferometer modulators (MZMs) are very useful for the most common modulation schemes, such as on-off keying (OOK) and binary phase shift keying (BPSK). In addition, MZMs would be elements for more complex modulators, high-speed optical switches, vector modulators, etc.


CONTENTS:
1 Role of optical modulation in photonic networks
1.1 Optical modulators for transmission
1.2 Signal bandwidth and modulation
1.2.1 Basic configuration of optical modulation
1.2.2 Amplitude modulation
1.2.3 Angle modulation
1.2.4 Bandwidth of modulated signals
1.3 Wavelength-division multiplexing
2 Direct and external modulation
2.1 Direct modulation
2.2 External modulation
2.2.1 Physical effect for modulation
2.2.2 Optical modulation by EA effect: EA modulation
2.2.3 Optical modulation by EO effect: EO modulation
3 Phase modulator based on Electro-Optic effect
3.1 Electro-optic effect in lithium niobate
3.2 Principle of optical phase modulation by electro-optic effect
3.3 Structure of optical phase modulator
3.4 Velocity matching for high-speed operation
4 Mach-Zehnder modulator based on phase modulation
4.1 Mach-Zehnder interferometers on integrated circuits
4.2 Intensity modulation by Mach-Zehnder modulators
4.3 Amplitude modulation and parasitic phase modulation
5 Precise modulation
5.1 Vector modulation
5.2 High extinction-ratio modulation

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Next English Webinar: June, 2023

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