CLEO-EU 2023 Koya Tanigawa

2023-08-21 2024-01-23 MatsuyamaHayato

Research

CLEO-EU Participation Report

26th June - 30th June, International Congress Center Messe München, munich, Germany

2nd year Master's degree Yukiya Tanigawa

1. participating conferences

Conference: 2023 Conference on Lasers and Electro-Optics/Europe - European Quantum
Electronics Virtual Conferences
Dates: June 26, 2023 - June 30, 2023
Place: International Congress Center Messe München, Munich, Germany

About CLEO Europe 2023

This is an international conference that presents the latest research and development trends in lasers, photonics, and optical science across a wide range of technical fields, and is held in the European region every other year. This is the first time for me to attend an international conference outside Japan, as I attended CLEO Pacific Rim 2022 the previous year, which was held in Hokkaido, Japan. The corona restrictions had finally been lifted, and the venue was full of energy. The scale of the exhibition was especially large, with a wide variety of exhibits by both well-known and new companies. The presentations were also very interesting, and I felt that the conference was well worth attending. This was my first visit to Europe, and I was impressed by the cityscape of Munich, the food, and the friendly atmosphere with the local people.
The communication was very enjoyable. Compared to Japan, the weather during this time of year was very pleasant, and just taking a walk in the city, which is dotted with old buildings, was a good change of pace. It was also a good experience to be able to experience a culture different from that of Japan, such as how to ride a train and how to eat.

3. presentation by the presenter

Title: Field Demonstration of Multi-Wavelength Optical Transmission with
Microresonator Frequency Combs
Presenter: Koya Tanigawa
Affiliation: Keio University
Presentation No.: CI-8.3 (Fri. 30th June)

We generated a soliton microcomputer with an FSR of 20 GHz and demonstrated high-capacity optical transmission over a 9 km round-trip commercial optical fiber connecting the Yagami Campus and the Shin-Kawasaki Town Campus of Keio University. A magnesium fluoride micro optical resonator was used as the resonator to increase spectral utilization efficiency, and an intensity modulation and direct detection method was employed to achieve low latency and low power consumption transmission. As a result, error-free operation was observed for a total of 94 channels at a modulation rate of 10 Gbps, with a total transmission capacity of 0.94 Tbps. The room was not very large, and the atmosphere was not so tense, probably due to the time of the evening on the last day of the conference. There were no complicated questions during the Q&A session, and the presentation was successfully completed.

4. presentations attended

Title: Parametrically-driven cavity solitons in a pure Kerr microresonator
Presenter: Miro Erkintalo
Affiliation: University of Auckland, New Zealand
Presentation No.: EF-2.2

The presentation was about the first experimental observation of parametrically driven cavity solitons (PDCS) in a pure Kerr resonator. Parametric driving is the indirect generation of solitons by optical parametric oscillation using second- and third-order nonlinear optical effects in the resonator, as opposed to external laser driving. In this study, a silicon nitride resonator is excited at two wavelengths to generate a PDCS between the excitation frequencies. This can significantly reduce CW backgrinding noise, which is a problem with conventional solitons, and can be generated by a pure Kerr resonator, thus reducing the manufacturing cost.

Title: Soliton Generation in a Gallium Phosphide Photonic Crystal Cavity
Presenter: Alisa Davydova
Affiliation: Swiss Federal Institute of Technology Lausanne (EPFL)
Presentation No.: EF-2.3

The presentation demonstrated a gallium phosphorus photonic crystal resonator with a broadband dispersion design and very high Q-value, and furthermore succeeded in generating dissipative Kerr solitons (DKS) by subharmonic pulse pumping. The refractive index and Kerr nonlinearity of gallium phosphide are higher than those of silicon nitride, and the formation of broadband soliton combs was realized, while the pulse pumping by EO combs reduced the thermal effects. The very wide 3 dB bandwidth of 3.0 THz, achieved by properly designing the anomalous dispersion, was also impressive.

Title: Realization of Multi-Mode Reflector Lasers for Integrated Photonics
Presenter: Fwoziah T. Albeladi
Affiliation: Cardiff University, United Kingdom
Presentation No.: CB-4.5

InAs quantum dot lasers with multimode interference reflector (MMIR) structure were designed and fabricated, and their characteristics such as threshold current and temperature dependence were verified. Simulation results showed high reflectivity of more than 80% and a threshold current density of 40% compared to a ridge-waveguide laser with the same resonator length. MMIR lasers are also promising as small footprint light sources for integrated photonics.