Energy-efficient optical quantization scheme with orthogonal spectral slicing by AWG for OFDM. - Takahiro Kodama; Ryosuke Matsumoto; Akihiro Maruta; Ken-ichi Kitayama (OFC/NFOEC, 2013)

Highly-scalable, fully-asynchronous 16 ONUs, OCDM-based 10G-PON with a multiple access noise suppression at RN. - Takahiro Kodama; Naoya Wada; Gabriella Cincotti; Ken-ichi Kitayama (OFC/NFOEC, 2013)

Cost-effective, asynchronous 4 × 40Gbps full-duplex OCDMA demonstrator using apodized SSFBGs and a multi-port encoder/decoder. - Ryosuke Matsumoto; Takahiro Kodama; Satoshi Shimizu; Ryujiro Nomura; Koji Omichi; Naoya Wada; Ken-ichi Kitayama (OFC/NFOEC, 2013)

Fixed-length elastic-capacity OFDM payload packet: Concept and demonstration. - Yuki Yoshida; Takahiro Kodama; Satoshi Shinada; Naoya Wada; Ken-ichi Kitayama (OFC/NFOEC, 2013)

Scaling the System Capacity and Reach of a 10G-TDM-OCDM-PON System Without an En/Decoder at an ONU. - Takahiro Kodama; Yusuke Tanaka; Satoshi Yoshima; Nobuyuki Kataoka; Junichi Nakagawa; Satoshi Shimizu; Naoya Wada; Ken-ichi Kitayama (JOCN, 2013)

A novel optical quantization approach using spectral shifts of OFDM subcarriers and a frequency packed AWG. - Takahiro Kodama; Koji Morita; Gabriella Cincotti; Ken-ichi Kitayama (ECOC, 2014)

Asynchronous MDM-OCDM-based 10G-PON over 40km-SMF and 2km-TMF using mode MUX/DeMUX at remote node and OLT. - Takahiro Kodama; Tomoki Isoda; Koji Morita; Akihiro Maruta; Ryo Maruyama; Nobuo Kuwaki; Shoichiro Matsuo; Naoya Wada; Gabriella Cincotti; Ken-ichi Kitayama (OFC, 2014)

Flexible power-efficient Nyquist-OTDM transmitter, using a WSS and time-lens effect. - Gabriella Cincotti; Satoshi Shimizu; Takuya Murakawa; Takahiro Kodama; Kunihiro Hattori; Masayuki Okuno; Shinji Mino; Akira Himeno; Tomotaka Nagashima; Makoto Hasegawa; Naoya Wada; Hiroyuki Uenohara; et al. (OFC, 2015)

Nonlinear-Error-Free Optical Quantization Using Dense Spectral Slicing. - Takahiro Kodama; Ryosuke Matsumoto; Akihiro Maruta; Tsuyoshi Konishi; Ken-ichi Kitayama (IEICE Trans. Commun., 2016)

Frequency-domain hybrid N × 100 Gb/s regular QAMs for simple, scalable, and transparent software-defined optical transport. - Masashi Binkai; Takahiro Kodama; Tsuyoshi Yoshida; Yuita Noguchi; Naoki Suzuki; Kuniaki Motoshima (OFC, 2017)

Simple frequency-domain hybrid-QAM superchannel with path-fitted pre-filtering and collaborative-subcarrier frequency self-tuning for flexible ROADM systems. - Takahiro Kodama; Masashi Binkai; Tsuyoshi Yoshida (OFC, 2017)

Demonstration of data-rate and power-budget adaptive 100 Gb/s/ A-based coherent PON downlink transmission. - Takahiro Kodama; Ryosuke Matsumoto; Naoki Suzuki (OFC, 2017)

Seamless PAM-4 to QPSK Modulation Format Conversion at Gateway for Short-Reach and Long-Haul Integrated Networks. - Takahiro Kodama; Tatsuya Miyazaki; Masanori Hanawa (ECOC, 2018)

Multi-level QAM-based labels Generated by the Convolution of Optical and Electrical Codes. - Takahiro Kodama; Gabriella Cincotti (PSC, 2018)

Dispersion-induced IQ Imbalance Compensation Using an Electrical-domain Pre-FDE in QPSK Self-homodyne Transmission with AQPM Pilot-carrier. - Takahiro Kodama; Yamato Iwama; Masanori Hanawa (PSC, 2018)

Hybrid Opto-Electrical CDM-Based Access Network. - Takahiro Kodama; Gabriella Cincotti (IEICE Trans. Commun., 2018)

Low-Speed DSP Assisted Dispersion Compensation-Free IM/DD Optical OFDM Transmission Over 100 km-SMF using Time- and Frequency-Domain Sparse-Subcarrier Multiplexing. - Takahiro Kodama; Tatsuya Miyazaki; Masanori Hanawa; Akihiro Maruta; Naoya Wada; Gabriella Cincotti (OFC, 2019)

Enhanced Optical Communications Through Joint Time-Frequency Multiplexing Strategies. - Tsuyoshi Konishi; Takuya Murakawa; Tomotaka Nagashima; Satoshi Shimizu; Makoto Hasegawa; Kuninori Hattori; Masayuki Okuno; Shinji Mino; Akira Himeno; Naoya Wada; Hiroyuki Uenohara; Takahiro Kodama; et al. (OFC, 2019)

SOP Independent Self-Homodyne Detection of Polarization Multiplexed QPSK Signal with AQPM Pilot Carrier. - Masanori Hanawa; Takahiro Kodama; Kazuhiko Nakamura (OECC/PSC, 2019)

Underwater Wireless Optical Access Network with OFDM/SBMA System: Concept and Demonstration. - Takahiro Kodama; Koki Arai; Kota Nagata; Kazuhiko Nakamura; Masanori Hanawa (OECC/PSC, 2019)

Over 1 Gbit/s NRZ-OOK Underwater Wireless Optical Transmission Experiment Using Wideband PMT. - Kazuhiko Nakamura; Kenichi Nagaoka; Daisuke Matsuo; Takahiro Kodama; Masanori Hanawa (OECC/PSC, 2019)

Hybrid QAM-Based Labels Generated by Two Multi-Level PSK Codes. - Takahiro Kodama; Gabriella Cincotti (IEICE Trans. Commun., 2019)

Demonstration of Any-Care-Access Non-Directional Spatial Cross-Connects Based on Core Selective Switch with and without Core-Contention Constraint. - Takahiro Kodama; Tsubasa Ishikawa; Daiki Suzuki; Masahiko Jinno (ECOC, 2020)

Spatial Channel Network (SCN): Introducing Spatial Bypass toward the SDM Era. - Masahiko Jinno; Takahiro Kodama (OFC, 2020)

Five-Core 1×6 Core Selective Switch and Its Application to Spatial Channel Networking. - Masahiko Jinno; Takahiro Kodama; Tsubasa Ishikawa (OFC, 2020)

Energy-Efficient Coherent PON System with Access-Span Length Difference between ONUs using Marginal IQ Power Loading in Downlink Transmission. - Takahiro Kodama; Kouki Arai (OFC, 2020)

Fixed-Rate-Breaking All-Optical OFDM System using Time-Domain Hybrid PAM with Sparse Subcarrier Multiplexing and Power-Loading for Optical Short-Reach Transmission. - Takahiro Kodama; Akihiro Maruta; Naoya Wada; Gabriella Cincotti (OFC, 2020)

Ultra-Wideband and Low-Loss Core Selective Switch Employing Two-Dimensionally Arranged MEMS Mirrors. - Masahiko Jinno; Itsuki Urashima; Tsubasa Ishikawa; Takahiro Kodama (OFC, 2021)

Wavelength Collision-Free and Low-Loss Full-Duplex Transmission over Switchable Full-Coupling or Half-Split Coherent WDM-PON System with Shared Protection. - Takahiro Kodama; Tetsuji Goto; Ryosuke Matsumoto (OFC, 2021)

Comprehensive Analysis of Time-Domain Hybrid PAM for Data-Rate and Distance Adaptive UWOC System. - Takahiro Kodama; Muhamad Aizat Bin Ahmad Sanusi; Fumiya Kobori; Tomotaka Kimura; Yoshiaki Inoue; Masahiko Jinno (IEEE Access, 2021)

Time-Domain Hybrid PAM for Data-Rate and Distance Adaptive UWOC System. - Takahiro Kodama; Muhamad Aizat Bin Ahmad Sanusi; Fumiya Kobori; Tomotaka Kimura; Yoshiaki Inoue; Masahiko Jinno (CoRR, 2021)

Technoeconomic analysis of spatial channel networks (SCNs): benefits from spatial bypass and spectral grooming [Invited]. - Masahiko Jinno; Yu Asano; Yoshiki Azuma; Takahiro Kodama; Riku Nakai (JOCN, 2021)

Enhancing the flexibility and functionality of SCNs: demonstration of evolution toward any-core-access, nondirectional, and contentionless spatial channel cross-connects [Invited]. - Masahiko Jinno; Tsubasa Ishikawa; Takahiro Kodama; Hiroshi Hasegawa; Suresh Subramaniam 001 (JOCN, 2021)

Global Optimization of Relay Placement for Seafloor Optical Wireless Networks. - Yoshiaki Inoue; Takahiro Kodama; Tomotaka Kimura (IEEE Trans. Wirel. Commun., 2021)

Any-Double-Link Failure Tolerant Bypass/Backup Switchable WDM-PON Employing Path-Pair Shared Protection and Bidirectional Wavelength Pre-assignment. - Takahiro Kodama; Tomoya Nakagawa; Ryosuke Matsumoto (OFC, 2022)

Core Selective Switch Supporting 15 Cores Per Port Using Bundled Three 5-Core Fibers. - Yudai Uchida; Tsubasa Ishikawa; Itsuki Urashima; Shoma Murao; Takahiro Kodama; Yasuki Sakurai; Ryuichi Sugizaki; Masahiko Jinno (OFC, 2022)

Polarization-independent Subtractive Interference Cancellation for Bidirectional Same-band Digital Coherent System. - Hidetoshi Amano; Mizuki Inagaki; Takahiro Kodama (OECC/PSC, 2022)

C-Band Downlink Coherent System Assisted TWDM-PON System with Type B Protection and Dual-DSP Collaborative SIMO. - Shota Eguchi; Tomoya Nakagawa; Mizuki Inagaki; Keiji Shimada; Takahiro Kodama (OECC/PSC, 2022)

Inter Symbol Interference-tolerant Time-domain Hybrid PAM2/PAM4 Signal with Optimized Time Slot Arrangement. - Fumiya Kobori; Keita Tanaka; Takahiro Kodama (OECC/PSC, 2022)

First Demonstration of Hierarchical SDM/WDM 10-Mode-Fiber Ring Network with Spatial Bypass and Reconfigurable Spatial Add/Drop Multiplexing. - Takahiro Kodama; Shohei Beppu; Daiki Soma; Yuta Wakayama; Noboru Yoshikane; Masahiko Jinno; Takehiro Tsuritani (OECC/PSC, 2022)

All-optical MDM-OFDM System Using A Single MUX/DeMUX for Future Converged Optical Networks. - Takahiro Kodama; Gabriella Cincotti (OECC/PSC, 2022)

Experiment of Nationwide Multi-Route Skew Cancelling for Dynamic Mapping of MAC Signals over SDM/WDM Network Testbed. - Masaki Murakami; Yoshihiko Uematsu; Satoru Okamoto; Naoaki Yamanaka; Daiki Soma; Shohei Beppu; Noboru Yoshikane; Takehiro Tsuritani; Takahiro Kodama; Masahiko Jinno (OECC/PSC, 2022)

Secure Point-to-Multipoint Transmission with Access-Span Difference Using Phase Encryption and Power-Loaded IQ-Channel Multiplexing. - Keiiji Shimada; Ryosuke Matsumoto; Keita Tanaka; Takahiro Kodama (PSC, 2023)

Kalman-Filter-Aided Dual-Band Collaborative Frequency Self-Tuning in Multiband Transceiver for P-to-MP System with Tight Passband Narrowing. - Keita Tanaka; Keiiji Shimada; Takahiro Kodama; Momoka Masaoka; Ken'ichi Fujimoto (PSC, 2023)

Super Wide-Flat Beam Transmission over Scatter-prone Underwater Channel Using Twin Parallel Flat-Narrow Beams Generated by Aspheric Lens Pair-type Beam Shaper. - Tomoya Ishikawa; Ayumu Kariya; Fumiya Kobori; Keita Tanaka; Takahiro Kodama (OFC, 2024)

Broadband Single Flat Narrow Beam Shaped Time-domain Adaptive Modulation for Underwater Transmission with Wavelength Characteristics in Blue-green WDM System. - Takahiro Kodama; Fumiya Kobori; Ayumu Kariya; Keita Tanaka; Kiichiro Kuwahara (OFC, 2024)

Air/Water Path Switching with Beam Steering for Water Distance/Turbidity Adaptive Underwater Optical Wireless Communication Network: Concept and Demonstration. - Kiichiro Kuwahara; Hyuga Nagami; Keita Tanaka; Fumiya Kobori; Ayumu Kariya; Shogo Hayashida; Takahiro Kodama (OFC, 2024)

Double-link-failure-tolerant shared protection for fully coupled/half-split switchable point-to-multipoint coherent optical systems. - Takahiro Kodama; Tomoya Nakagawa; Shota Eguchi; Keiji Shimada; Ryosuke Matsumoto (J. Opt. Commun. Netw., 2024)

Relay Node Placement Considering Age of Information for Seafloor Optical Wireless Networks. - Hayato Taniguchi; Nagisa Iwami; Tomotaka Kimura; Takahiro Kodama; Jun Cheng 001 (ICOIN, 2025)

Bit-rate Adaptive Optical Attocell Networks with λ-Tunable Beam Steering Under Physical Impairments. - Takahiro Kodama; Kiichiro Kuwahara; Mikolaj Wolny; Eduward Tangdiongga (OFC, 2025)

Silicon Photonics-based Waveband Routing for Flexible Functional Splits. - Takahiro Kodama; Ryosuke Matsumoto; Kazuhiro Ikeda; Shu Namiki (OFC, 2025)