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Semi-Cooled Operation at 106 GBaud of 8λ LAN-WDM Directly-Modulated Membrane Laser Array Exhibiting PPR
Nikolaos-Panteleimon Diamantopoulos;Takuro Fujii;Hidetaka Nishi;Koji Takeda;Tomonori Sato;Shinji Matsuo
ECOC 2024; 50th European Conference on Optical Communication
Year: 2024 | Conference Paper |
We present the first DML array exhibiting the photon-photon resonance (PPR) effect for wavelength- division multiplexed (WDM) short-reach interconnects. Semi-cooled (50oC) operation of an 8-channel LAN-WDM membrane laser array on SiO2/Si at 106 GBaud NRZ over 2-km transmissions is demonstrated with ~154 fJ/bit laser-bias energies.Show More
40-Gbps Direct Modulation of Electrically Driven 1D Photonic-Crystal Nanolaser on SiO2/Si
Takuma Tsurugaya;Koji Takeda;Takuro Fujii;Toru Segawa;Shinji Matsuo
2024 Conference on Lasers and Electro-Optics (CLEO)
Year: 2024 | Conference Paper |
We demonstrate 40-Gbps, 16.6-fJ/bit direct modulation of a one-dimensional photonic-crystal (1D-PhC) nanolaser on SiO2/Si with 180-µA bias current. Very strong optical confinement in the laterally-current-injected 1D-PhC nanocavity is a key for the high-speed, high-modulation-efficiency operation.Show More
Continuous-Wave Operation of 1D Photonic-Crystal Nanolasers on SiO2/Si at up to 100°C
Takuma Tsurugaya;Koji Takeda;Takuro Fujii;Toru Segawa;Shinji Matsuo
2024 IEEE 29th International Semiconductor Laser Conference (ISLC)
Year: 2024 | Conference Paper |
We demonstrate continuous-wave operation of electrically-driven 1D photonic-crystal nanolasers on SiO2/Si at up to 100°C. The strong optical confinement, high-Q cavity, and appropriate wavelength detuning from the gain peak facilitate high-temperature operation, enabling us to achieve an ultralow threshold current of \mathbf{52}\ \boldsymbol{\mu} \mathbf{A} at 100°C.Show More
Estimation of Multi-Expert Sperm Assessments Using Video Recognition Based Model Trained by EMD Loss
Hayato Nakagawa;Takuro Fujii;Yasushi Yumura;and Tomoki Hamagami
Infertility is a common problem, affecting approximately one in six adults worldwide. Some studies have shown that male factors contribute to infertility in up to 50% of couples. Intracytoplasmic sperm injection (ICSI) is a common treatment for male infertility. This procedure requires a quick and accurate determination of whether sperm are suitable for ICSI. However, this assessment requires expe...Show More
Directly Modulated Membrane Lasers on SiC Integrated With Spot-size Converters
Suguru Yamaoka;Takuma Aihara;Nikolaos-Panteleimon Diamantopoulos;Hidetaka Nishi;Takuro Fujii;Yoshiho Maeda;Hiroki Sugiyama;Tatsurou Hiraki;Koji Takeda;Toru Segawa;Shinji Matsuo
Membrane lasers on a SiC substrate offer high-speed direct modulation due to the high thermal dissipation and large optical confinement provided by SiC's high-thermal conductivity and moderate refractive index (∼2.6). A remaining problem is the high coupling loss to a single-mode fiber (SMF) arising from the difficulty in producing a waveguide on SiC substrate whose effective refractive index matc...Show More
Ultrafast Electro-Optic Spiking Membrane III-V Lasers on Silicon Utilizing Integrated Optical Feedback
Nikolaos-Panteleimon Diamantopoulos;Takuro Fujii;Suguru Yamaoka;Hidetaka Nishi;Shinji Matsuo
This paper summarizes various experimental results on the characterization of the novel spiking membrane lasers on SiO2/Si and their spiking dynamics. The ultra-thin (<350-nm-thick) membrane III-V on SiO2/Si structure results in a very high optical confinement factor which is suitable for both increasing processing speeds and minimizing power consumptions. Moreover, for spiking generation we rely ...Show More
4 ch × 30-Gbps/ch Optical Transmission Performance of a Low-Power Transmitter Flip-Chip-Bonded 1.3-μM LD Array-on-Si
Toshiki Kishi;Munehiko Nagatani;Shigeru Kanazawa;Kota Shikama;Takuro Fujii;Hidetaka Nishi;Tadashi Minotani;Norio Sato;Toru Segawa;Shinji Matsuo
This paper presents a four-channel (4-ch) transmitter consisting of a 4-ch 65-nm CMOS cascode shunt laser diode (LD) driver and flip-chip-bonded 1.3-μm membrane LD-array-on-Si that has the highest power efficiency yet reported for 4-ch over-25-Gbps/ch transmitters that use distributed-feedback (DFB)-LDs and vertical-cavity surface emitting lasers. In order to transmit over-25-Gbps/ch NRZ PRBS-31 s...Show More
Uncooled Operation of Directly Modulated Membrane Laser with Buried Sapphire Layer on Si Substrate
Tatsurou Hiraki;Yoshiho Maeda;Takuro Fujii;Koji Takeda;Takuma Aihara;Toru Segawa;Yasutomo Ota;Satoshi Iwamoto;Yasuhiko Arakawa;Shinji Matsuo
2024 Optical Fiber Communications Conference and Exhibition (OFC)
Year: 2024 | Conference Paper |
Automated Sperm Assessment Framework and Neural Network Specialized for Sperm Video Recognition
Takuro Fujii;Hayato Nakagawa;Teppei Takeshima;Yasushi Yumura;Tomoki Hamagami
2024 IEEE/CVF Winter Conference on Applications of Computer Vision (WACV)
Year: 2024 | Conference Paper |
Cited by: Papers (1)
Infertility is a global health problem, and an increasing number of couples are seeking medical assistance to achieve reproduction, at least half of which are caused by men. The success rate of assisted reproductive technologies depends on sperm assessment, in which experts determine whether sperm can be used for reproduction based on morphology and motility of sperm. Previous sperm assessment stu...Show More
16-Channel Directly Modulated Membrane III-V Laser Array on SiO2/Si Utilizing Photon-Photon Resonance
Nikolaos-Panteleimon Diamantopoulos;Takuro Fujii;Suguru Yamaoka;Hidetaka Nishi;Koji Takeda;Toru Segawa;Shinji Matsuo
Journal of Lightwave Technology
Cited by: Papers (2)
Following the demand for 1.6 Tbps and beyond data rates and lower power consumption transceivers in data center networks and related systems, we present the first 16-channel directly modulated laser (DML) array exhibiting the photon-photon resonance (PPR) effect. Bandwidths of ∼50 GHz at bias currents between 6.1 ∼ 9.2 mA were achieved for all 16 channels in a membrane laser array on SiO2/Si with ...Show More
Micro-Transfer-Printed InP-Based Membrane Photonic Devices on Thin-Film Lithium Niobate Platform
Yoshiho Maeda;Hidetaka Nishi;Nikolaos-Panteleimon Diamantopoulos;Takuro Fujii;Takuma Aihara;Suguru Yamaoka;Tatsurou Hiraki;Koji Takeda;Toru Segawa;Yasutomo Ota;Satoshi Iwamoto;Yasuhiko Arakawa;Shinji Matsuo
Journal of Lightwave Technology
Cited by: Papers (2)
We demonstrate a heterogeneous integration of electrically-pumped membrane lasers and semiconductor optical amplifiers (SOAs) on a thin-film lithium niobate (TFLN) platform by a micro-transfer-printing (μTP) method. Thanks to the low coupling loss (∼1.0 dB) between the InP-based membrane photonic devices and the TFLN waveguides, mW-class output power laser and low-power-consumption SOA on a TFLN p...Show More
Micro-Transfer-Printed InP-Based Membrane Photonic Devices on Thin-Film Lithium Niobate Platform
Yoshiho Maeda;Hidetaka Nishi;Nikolaos-Panteleimon Diamantopoulos;Takuro Fujii;Takuma Aihara;Suguru Yamaoka;Tatsurou Hiraki;Koji Takeda;Toru Segawa;Yasutomo Ota;Satoshi Iwamoto;Yasuhiko Arakawa;Shinji Matsuo
BiLMa: Bidirectional Local-Matching for Text-based Person Re-identification
2023 IEEE/CVF International Conference on Computer Vision Workshops (ICCVW)
Year: 2023 | Conference Paper |
Cited by: Papers (7)
Text-based person re-identification (TBPReID) aims to retrieve person images represented by a given textual query. In this task, how to effectively align images and texts globally and locally is a crucial challenge. Recent works have obtained high performances by solving Masked Language Modeling (MLM) to align image/text parts. However, they only performed uni-directional (i.e., from image to text...Show More
Membrane Photonic Devices for IOWN
2023 28th Microoptics Conference (MOC)
Year: 2023 | Conference Paper |
Increasing power consumption in the data center has become a social issue. In order to reduce power consumption, the introduction of optical technology into the ultra-short range is highly desired. For this purpose, we are developing the membrane photonic devices, which are heterogeneously integrated with the Si photonic devices.Show More
1D Photonic-Crystal Laser with Laterally-Current-Injected Ultrasmall Buried Active Region on SiO2/Si Substrate
Takuma Tsurugaya;Koji Takeda;Takuro Fujii;Toru Segawa;Shinji Matsuo
2023 Conference on Lasers and Electro-Optics (CLEO)
Year: 2023 | Conference Paper |
One-dimensional photonic-crystal lasers with 2.5-μm-long buried active regions are fabricated on SiO2/Si substrate. The rib-shaped structure enables lateral-current-injection, high-Q cavity, and strong optical confinement. The device exhibits 13.0-μA threshold current and 28.0% external differential-quantum-efficiency.Show More
High-Baud-Rate Direct Modulation of Membrane Laser on SiC under Uncooled Condition
S. Yamaoka;N.-P. Diamantopoulos;H. Nishi;T. Fujii;K. Takeda;T. Hiraki;S. Kanazawa;T. Kakitsuka;S. Matsuo
2023 IEEE Silicon Photonics Conference (SiPhotonics)
Year: 2023 | Conference Paper |
We review recently developed membrane lasers on a SiC substrate. Due to the high thermal dissipation, high optical confinement, and an additional optical feedback effect, the laser yields a ~30-GHz relaxation oscillation frequency and 74-GHz bandwidth at 85°C, which makes uncooled 100-GBaud direct modulation possible.Show More
30-Gbps/ch x 4 ch Simultaneous Error-Free Transmission with A Low-Power Transmitter Flip-Chip-Bonded 1.3-μm LD-Array-on-Si
Toshiki Kishi;Munehiko Nagatani;Shigeru Kanazawa;Kota Shikama;Takuro Fujii;Hidetaka Nishi;Tadashi Minotani;Norio Sato;Toru Segawa;Shinji Matsuo
2023 Optical Fiber Communications Conference and Exhibition (OFC)
Year: 2023 | Conference Paper |
Uncooled Operation of Si Mach-Zehnder Modulator Integrated with Membrane Semiconductor Optical Amplifiers inside Interferometer Arms
Takuma Aihara;Tatsurou Hiraki;Takuro Fujii;Koji Takeda;Hiroshi Fukuda;Takaaki Kakitsuka;Tai Tsuchizawa;Shinji Matsuo
2023 Optical Fiber Communications Conference and Exhibition (OFC)
Year: 2023 | Conference Paper |
Micro-Transfer-Printed Membrane Distributed Reflector Lasers on Si Waveguide Modulated With 50-Gbit/s NRZ Signal
Yoshiho Maeda;Takuma Aihara;Takuro Fujii;Tatsurou Hiraki;Koji Takeda;Tai Tsuchizawa;Hiroki Sugiyama;Tomonari Sato;Toru Segawa;Yasutomo Ota;Satoshi Iwamoto;Yasuhiko Arakawa;Shinji Matsuo
Journal of Lightwave Technology
Cited by: Papers (7)
In this work, we fabricate directly modulated membrane distributed reflector (DR) lasers on a Si waveguide by utilizing micro-transfer printing method. Micro-transfer printing enables low-loss coupling between the lasers and the silicon photonics circuit, and since it is a back-end process, we can test the lasers prior to integration. A membrane laser is as thick as the Si waveguides, which makes ...Show More
Uncooled 100-GBaud Directly Modulated Membrane Lasers on SiC Substrate
Suguru Yamaoka;Nikolaos-Panteleimon Pandelis Diamantopoulos;Hidetaka Nishi;Takuro Fujii;Koji Takeda;Tatsurou Hiraki;Shigeru Kanazawa;Takaaki Kakitsuka;Shinji Matsuo
Journal of Lightwave Technology
Cited by: Papers (10)
We investigate the temperature dependence of the dynamic characteristics of a 1.3-μm InGaAlAs-based directly modulated membrane laser on a SiC substrate. The laser is fabricated by combining direct wafer bonding of SiC and InP substrates using a very thin (∼10 nm) oxide layer and epitaxial regrowth of a membrane InP layer on the InP/SiC template. The membrane laser structure on SiC with a high the...Show More
Over-67-GHz-Bandwidth Membrane InGaAlAs Electro-Absorption Modulator Integrated With DFB Laser on Si Platform
Tatsurou Hiraki;Takuma Aihara;Yoshiho Maeda;Takuro Fujii;Tomonari Sato;Tai Tsuchizawa;Kiyoto Takahata;Takaaki Kakitsuka;Shinji Matsuo
Journal of Lightwave Technology
Cited by: Papers (7)
We fabricate a membrane InGaAlAs electro-absorption modulator (EAM) integrated with a distributed feedback (DFB) laser combining direct wafer bonding and epitaxial regrowth of InP-based layers on a silicon-on-insulator wafer. Heterogeneous integration of an InP-based multiple-quantum-well (MQW) layer into the Si photonics simplifies the integration of the O-band EAMs and laser diodes (LDs). EAMs a...Show More
Heterogeneously Integrated Membrane III-V Compound Semiconductor Devices With Silicon Photonics Platform
Shinji Matsuo;Takuma Aihara;Tatsurou Hiraki;Yoshiho Maeda;Toshiki Kishi;Takuro Fujii;Koji Takeda;Takaaki Kakitsuka
IEEE Journal of Selected Topics in Quantum Electronics
Year: 2023 | Volume: 29, Issue: 3: Photon. Elec. Co-Inte. and Adv. Trans. Print. | Journal Article |
Cited by: Papers (6)
Silicon photonics is a key technology for constructing large-scale photonic integrated circuits (PICs) because it enables large-scale wafer processes with high uniformity and quality. To further improve device characteristics, heterogeneous integration of III-V compound semiconductors that provide optical gain, a high modulation efficiency, and optical non-linearity is desired. This paper describe...Show More
Heterogeneously Integrated Membrane III-V Compound Semiconductor Devices With Silicon Photonics Platform
Shinji Matsuo;Takuma Aihara;Tatsurou Hiraki;Yoshiho Maeda;Toshiki Kishi;Takuro Fujii;Koji Takeda;Takaaki Kakitsuka
Year: 2023 | Volume: 29, Issue: 3: Photon. Elec. Co-Inte. and Adv. Trans. Print. | Journal Article |
256-Gbit/s PAM-4 Directly Modulated Membrane Lasers on SiC Substrate
Suguru Yamaoka;Nikolaos-Panteleimon Diamantopoulos;Hidetaka Nishi;Takuro Fujii;Koji Takeda;Tatsurou Hiraki;Takuma Tsurugaya;Shigeru Kanazawa;Hiromasa Tanobe;Takaaki Kakitsuka;Tai Tsuchizawa;Fumio Koyama;Shinji Matsuo
2022 Conference on Lasers and Electro-Optics Pacific Rim (CLEO-PR)
Year: 2022 | Conference Paper |
256-Gbit/s PAM-4 Directly Modulated Membrane Lasers on SiC Substrate
Suguru Yamaoka;Nikolaos-Panteleimon Diamantopoulos;Hidetaka Nishi;Takuro Fujii;Koji Takeda;Tatsurou Hiraki;Takuma Tsurugaya;Shigeru Kanazawa;Hiromasa Tanobe;Takaaki Kakitsuka;Tai Tsuchizawa;Fumio Koyama;Shinji Matsuo
Year: 2022 | Conference Paper |
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