2023 Fiscal Year Research-status Report
Artificial Intelligence(AI)-Aided Photon Counting Detection in Optical Wireless Communications
| Project/Area Number |
23K13332
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| Research Institution | Japan Advanced Institute of Science and Technology |
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Principal Investigator |
HE Cuiwei 北陸先端科学技術大学院大学, 先端科学技術研究科, 助教 (20914881)
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| Project Period (FY) |
2023-04-01 – 2026-03-31
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| Keywords | Optical communication / Fluorescent antenna / Interdisciplinary |
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| Outline of Annual Research Achievements |
Last year, I focused on developing a new type of optical fluorescent antenna to be used for the proposed photon counting-based optical wireless communication (OWC) system. The developed fluorescent antenna is capable of optical filtering and also supports a wide field of view. Importantly, it absorbs light only from the transmitter and then re-emits a large number of photons which are then concentrated toward the photodetector, thereby significantly enhancing the received signal strength. Moreover, I established interdisciplinary collaborations with materials science experts, and together we fabricated fluorescent antennas using advanced materials fabrication techniques, such as Forster resonance energy transfer (FRET). Our results show that the new FRET antenna can simultaneously result in a high photoluminescence quantum yield (PLQY) and a short photoluminescence (PL) lifetime. Additionally, due to the large Stokes shift achieved using FRET, we successfully bridged the mismatch between the optimal wavelengths at the transmitter and the optimal wavelength of the silicon photodetector. Furthermore, I have constructed an OWC testbed and successfully demonstrated the use of fluorescent antennas for supporting wavelength division multiplexing (WDM) to boost the transmission data rate. In recent work, I also compared the performance of two different neural network structures for signal demodulation in a photon counting based OWC system. These achievements have been published in top journals, such as the IEEE J. Light. Technol., IEEE Photonics Technol. Lett., and Optics Express.
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| Current Status of Research Progress |
Current Status of Research Progress
2: Research has progressed on the whole more than it was originally planned.
Reason
In the current stage, various types of fluorescent antennas have been developed for optical wireless communication (OWC) systems. Their performance is currently under investigation in photon counting systems. Additionally, I am exploring different neural network structures for signal equalization and demodulation in a photon counting-based OWC system. These efforts have resulted in many publications, including one journal paper in the IEEE/Optica Journal of Lightwave Technology, one journal paper in the IEEE Photonics Technology Letters, one journal paper in Optics Express, and a review paper in Photonics, alongside several international conference papers. The preliminary results indicate that the KAKENHI project is progressing as planned.
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| Strategy for Future Research Activity |
In 2024, my research plan will be divided into three interconnected directions:
1. Construction of a "super photon counting receiver" by combining the fluorescent antenna with a silicon photomultiplier (SiPM) sensor. This is expected to surpass the sensitivity of many existing optical receivers and support reliable communication even when the received light intensity is low.
2. Development of an optical antenna made of multiple fluorescent layers, with each layer designed to absorb different wavelengths. The goal is to configure a luminaire transmitter using RGB LEDs to transmit three independent data streams, with each fluorescent layer selectively absorbing light emitted from a single color of LED. This setup allows for the creation of parallel channels with minimal crosstalk, thereby boosting the transmission data rate.
3. Exploration of using a reservoir computing (RC) recurrent neural network to compensate for the nonlinear signal distortion in a SiPM-based photon counting OWC system. This exploration will begin with simulations and I will then investigate the possibility of creating an RC network via an optical microcavity.
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