CLEO 2022 Soseito Sugawara


CLEO 2022 Participation Report

15th-20th May 2022, : San Jose McEnery Convention Center, San Jose, California, US

Sosehito Sugawara, 2nd year master's student

About CLEO2022

The Conference of Laser and Electro Optics (CLEO): 2022 was held in California, USA from May 15 to 20. In recent years, due to the coronavirus, all conferences have been held only online, but this year, as the pandemic has settled down, the conference was held in a hybrid format of on-site and online. The following are the advantages and disadvantages of participating in a hybrid conference. The first advantage is, of course, that online participation is possible. During the period of the conference, for example, it was impossible to come to China to participate in the conference due to the thorough lockdown. However, Chinese researchers presented their research results through online participation, and we were able to attend the conference. We felt that this was a great advantage, as the response to the corona is changing in many countries. On the other hand, one of the drawbacks is the difficulty of operating two methods, on-site and online, at the same time. Although I did not actually participate in the management of the sessions, there were some problems that occurred during my participation in the sessions, such as the inability to see the screen online that could be shared on-site, and conversely, the inability of online participants to share their screens, which the management side had to deal with. In addition, the chairperson was basically on-site for the question-and-answer session, so the priority of online questions was inevitably lowered. However, these problems are likely to improve as the number of sessions increases, and I felt that the hybrid format is basically advantageous.
San Jose, where the conference was held, is the center of the so-called Silicon Valley, where huge tech companies that provide services worldwide have their headquarters. Walking around the venue for a short while, you can see the headquarters of companies such as zoom, Adobe, and nvidia, which made me realize that the U.S. is the world's top economic powerhouse. I don't know if this is the reason, but the cost of living is also very high. For example, a hamburger costs about $16 (2100 yen), which definitely put pressure on the author's wallet.

2. Presentation by the presenter

Title: Deterministic Generation of Perfect Soliton Crystal Assisted by Saturable
Presenter: Ayata Nakashima
Affiliation: Keio University
Presentation No.: SW5H.4 (Wed, May 18)

This presentation was about the measurement of Raman comb stability and longitudinal mode spacing of the comb, and the results of transmission experiments using Raman comb. The format of the presentation was oral, and I actually took the podium and made the presentation. First of all, I would like to give a self-evaluation of the presentation, and I cannot deny that there are many points to be improved. This was due to a combination of my lack of English proficiency and lack of practice. This was the first on-site presentation in English, and I think more careful preparation was necessary. Due to time constraints, I received only one question, a simple one asking whether resonator dispersion was controlled. Although the content of the presentation was unsatisfactory, it provided me with an opportunity to reevaluate what I need to improve, and I would like to make use of this experience in my next presentation.

3. presentations attended

[FW4J.7] Quantum Noise of Dark Pulse Microcombs 

The purpose of the presentation is to compare the noise of Bright soliton and Dark pulse. The resonator material is AlGaAs. The material of the resonator is AlGaAs, which is a joint research between Peking University and UCSB. First, the angular misalignment of the resonator inside the resonator corresponding to the pulse jitter was calculated by simulation. The results show that dark pulses are more stable than light pulses in terms of angular stability. As a result, the angle was more stable for dark pulses. As a result, the dark pulse had a more stable angle and a lower noise than the 13dB jitter bright soliton. Experimental results showed that the comb noise was as low as Quantum noise when the ASE noise was corrected, and that the noise was as low as the Quantum noise when the ASE noise was corrected. AlGaAs is suitable for measuring the quantum characteristics of microcombs, considering the fact that the comb generation can be done at low power, which is one of the advantages of using AlGaAs. The conclusion was that AlGaAs is suitable for measuring the quantum characteristics of microcombs. 

[SF2G.7] Sub-Milliwatt Coherent Microromb Generation

In connection with the aforementioned presentation, a presentation on the generation of dark pulses using an AlGaAs resonator was given.
The characteristics of the resonator are as follows. The characteristics of the resonator are as follows. Dark pulses can be generated with a power of about 1 mW, and the conversion efficiency is 15 %@10 mW. Notably, the comb generation range was confirmed to be very wide at 11 GHz@10 mW. Turnkey operation is also possible. When the laser is turned on, the resonance frequency of the resonator is changed by heat, and a pulse is generated. Since the laser has a wide-range comb region, controlling the temperature of the resonator allows the frep The problem is that the line width is wider than that of conventional solitons. One problem is that the line width is wider than that of conventional solitons, but this is not a problem for most applications.

Table 1 AlGaAs resonator characteristics
Parameter Value
Q-factor 3.3 × 106
Propagation loss (dB/cm) 0.2
Comb threshold (µW) 30