CLEO 2023 Goki Kawanishi

2023-06-02 2024-01-23 MatsuyamaHayato

Research

CLEO 2023 Participation Report

7th May - 12th May, Convention Center, San Jose, USA

Project ProfessorSatoshi Kawanishi

Outline

The Conference on Lasers and Electro-optics (CLEO) was organized by the American Physical Society (APS), the IEEE Photonics Society, and the Optical Society of America (Optica), and was the first face-to-face meeting in three years.

　A special event was held on May 7, the first day of the conference, to provide design and simulation training on optical integrated circuits. In addition, 19 short courses were held from May 7 to May 9, covering the fields of lasers and electro-optics. An exhibition was also held from May 9 to May 11.
　The technical sessions were divided into 18 sessions with presentations from 8:00 a.m. to 6:00 p.m. The latest research results were reported in the post-deadline sessions (number of sessions: 3) from 7:00 p.m. to 9:00 p.m. on May 11, the day before the final day of the conference.
　The following is a report of the contents of the meeting, mainly lectures related to the reporter's research.

2. plenary talk

JTu1A.1 Extreme Light Control With Optical Metasurfaces (Andrea Alu, CUNY Advanced Science)
Research Center, United States)

　The formation of certain structures on the surface of materials such as dielectrics makes it possible to generate new properties in optical properties. The principles and applications of meta-surfaces were introduced here.

JTu1A.2 The Urgent Roles for Optics and Photonics in Global Health and Climate Change (Thomas Baer, Stanford University, United States)

　The presentation introduced the use of optical technology to address global environmental change and health (or was it cancer diagnosis?) since the first laser measurement of the thickness of glaciers in 1988. The presentation included examples of applications to global environmental change and health (cancer diagnosis?) since the first measurement of glacier thickness using lasers in 1988.
The LIDAR technology was particularly effective.

JTu1A.3 Ultrafast Lasers to DEI: a 40-Year Journey (Ursula Keller, ETH Zurich, Switzerland)

　A female researcher from Switzerland gave a rather critical lecture on the disparity in treatment between men and women in the research field from a woman's perspective. This was the first time I learned that there is a gender gap in treatment even in Switzerland.

JW1A.1 Thermodynamics and Light (Shanhui Fan, Stanford University, United States)

　He introduced the relationship with light from the standpoint of thermodynamics. Examples such as 24-hour power generation by solar cells were introduced.

JW1A.2 Scaling Photonic Quantum Systems (Christine Silberhorn, Paderborn University, Germany)

　Experimental investigations of future multidimensional optical quantum systems based on integrated optics and time-spectral engineering were presented.

JW1A.3 Democratizing Nonlinear Photonics (Alexander Gaeta, Columbia University, United States)

Advances over the last 20 years in the technology of generating nonlinearities at milliwatt-level power by chip-based optics were presented. Car frequency combs were introduced.

3. presentation by the presenter

　The rapporteur presented on the third day of the conference, May 9, during the 4:00 p.m. session (Stu4G.2). The room had a capacity of about 150 people, and despite being the last session of the afternoon, about 40 people came to listen to the session.
　In this conference, the spectrum of the comb generated by the MgF2 micro resonator was wavelength-multiplexed through the 9 km round-trip commercial fiber laid between Yagami and Shin-Kawasaki, and then one of the spectra was cut out with a filter and coded.
The report focused on the results of character experiments in which error rate characteristics were measured. Questions and answers are as follows.
Q1: Preliminary experiments show that for error-free transmission, the signal speed must be less than or equal to the FSR
Why was it possible to transmit at 10 Gbit/s, the same as FSR, in the field transmission?
A1: Because a resonator with an FSR of 20 GHz was used in the field transmission. (This is the article of the preliminary and field experiments.
should have unified the cases).
(Below are questions received after the session)
Q2: How are the MgF2 resonator and the tapered fiber brought closer together?
A2: We are trying various ways, such as letting them contact each other once and then releasing them.
Q3: How long does the com last?
A3: We stabilized it for a few hours by preventing wind and vibration, etc. (I was told this was great).
Q4: Is modulation done on the whole com spectrum at once?
A4: That is correct in this experiment.

4. presentations that caught our attention

transmission relation

The session in which the reporter presented (Stu4G) was related to short reach transmission.

STU4G.1 (Invited talk) Advanced Modulation Formats for Short-Reach Systems (Xi Chen, Nokia Bell Labs, United States)

Signal formats for short-distance transmission were introduced, including single-sideband modulation, Stokes receiver and single-carrier interleave modulation methods.

STU4G.3 Reservoir Computing-Based Multi-Symbol Equalization for PAM 4 Short-Reach Transmission
(Yevhenii Osadchuk, Technical University of Denmark, Denmark)

The Technical University of Denmark reported on a 32 GBd PAM4 transmission experiment using spectral slices and reservoir computing. It was shown that the output complexity can be reduced by reducing the number of symbols to 17.

STU4G.4 Demonstration of 100-km Long O-Band WDM Amplified Coherent Transmission (Natsupa Taengnoi, Optoelectronics Research Centre, United Kingdom) )

　The University of Southampton (U.K.) reported on a 100 km WDM transmission experiment of polarization-multiplexed quad PSK in the O-band. The experiment used a bismuth-doped fiber amplifier and achieved a code error rate below the FEC limit.

STU4G.5 100-km Polarization-Orthogonal Self-Homodyne Coherent WDM Transmission Using Nonlinearity Suppressed SOA (Weihao Li, Huazhong Univ. of Science and Technology, China)

　A group from Huazhong University in China reported an 800 Gbit/s, 4-ch. polarization-orthogonal self-Homodyne coherent WDM transmission experiment using a semiconductor optical amplifier with small polarization-dependent gain. However, the local oscillator at the receiver side is supplied from the transmitter side.

SM2I.1 Gain Flattened Wideband YDFA for 1 μm Data Transmission (Yongmin Jung, University of Southampton, United Kingdom)

　A group from the University of Southampton, UK, reported on a gain-flattened YDFA, in which a gain-flattening filter is used between two YDFAs to suppress gain fluctuations to less than 1 dB. They also reported on a 1-μm wavelength transmission experiment using a 2.2-km hollow-core fiber.

Microcom related

　Two sessions related to microcomputers were held on May 11 (STh1J and STh3J). Here are the main reports.

STh1J.2 Low Stress Bilayer LPCVD-PECVD SiN Waveguides for Kerr Frequency Comb Generation (Karl McNulty, Columbia University, United States)

　A group at Columbia University in the U.S. reported comb generation by creating a microring consisting of two CVD layers of SiN. They excited the resonator at 1548 nm and 125 mW and reported comb generation in the wavelength band of 300 nm.

STh3J.3 Optical Data Transmission Using Inverse-Designed Silicon Multimode Photonic Circuits and Spectrally Flattened Microcombs (Kiyoul Yang, Stanford University, United States) Stanford University, United States)

　A group led by Stanford University reported a WDM transmission experiment in which a mode-multiplexing device fabricated by a method called inverse-design was combined with a micro resonator to generate a comb. The total transmission capacity of 1.76 Tbit/s was achieved by combining this device with a comb generated by a Si3N4 micro resonator, and 1.12 Tbit/s was achieved by combining a comb generated by a Ta2O5 micro resonator.

Poster Session
　The poster session was held from May 9 to May 11 at noon, with 160 posters presented on May 9, 153 on May 10, and 142 on May 11.
　In the poster presentations, the only transmission-related content was the following wireless system (JTh2A).

JTh2A.101 5G NR Fiber-Wireless Systems With Dual-Polarization Scheme and Single-Carrier Optical
Modulation (Hsu-Hung Huang, National Taipei University of Technology, Taiwan)

In this presentation, the results of single-carrier optical modulation with dual polarization that would achieve the goals of new fiber wireless systems in the 5G era are presented.

Post deadline session
　The post-deadline session was held on May 11 at 7:00 p.m., with a total of 23 presentations in three separate rooms. Among these presentations, the third session (Post-Deadline III) featured transmission-related papers.

STh5C.7 First Demonstration of a Cryogenic Silicon Organic Hybrid (SOH) Mach-Zehnder Modulator With a Sub-1V π-Voltage (Adrian Schwarzenberger, Karlsruhe Institute of Technology (KIT), Germany)

　The KIT group in Germany reported a low drive voltage Mach-Zehnder modulator with a hybrid configuration of silicon and organic materials. The cross section of the modulator is shown below. The organic material used is based on Perkinamine. Although the modulator operates at cryogenic temperatures (11 K), the half-wavelength voltage at 1532 nm is claimed to be 0.9 V, which is the lowest reported so far. Using this modulator, they report indoor transmission and reception experiments of 70 GBd PAM4 signals.

STh5C.8 Optical Arbitrary Waveform Generation and Measurement (OAWG/OAWM) Enabling 320 GBd 32QAM Transmission (Huanfa Peng, KIT, Germany)

　Following the above presentation, the group from KIT (Germany) reported on the use of an optical comb for arbitrary optical waveform generation (OAWG) and arbitrary optical waveform measurement (OAWM). A 320 GBd 16QAM signal was generated and transmitted over an 87 km fiber, received by OAWM, and measured for code error rate, achieving characteristics below the FEC limit.

exhibition
　This year's exhibition was held in the back half of the hall where the plenary sessions were held, and there were fewer exhibitors than at the previous show. Among them, Aerodiode (www.aerodiode.com) exhibited a lineup of laser-related equipment, including 520 nm-1650 nm LDs, 1310 nm and 1550 nm super luminescent diodes, and SOA modulators.

5. summary and future prospects

　This was the first CLEO in six years, but it was the first face-to-face meeting in three years, and those attending appeared to be pleased with the format. We hope that face-to-face meetings will continue in the future.
　The next CLEO2024 is scheduled for May 5 through May 10 in Charlotte, North Carolina.