Members

Faculty

Professor Takaaki Kakitsuka
Doctor of Engineering

1996-2019　NTT Corporation (Currently NTT, Inc.）
2019-2026　Associate Professor, Graduate School of Information, Production and Systems, Waseda University
2026　Professor, Graduate School of Information, Production and Systems, Waseda University

Theory of complex-coupled grating lasers

C. Zhang, K. Takahata, T. Hiraki, T. Aihara, S. Matsuo, and T. Kakitsuka, "Design of low-chirp directly modulated corrugation-pitch-modulated distributed-reflector lasers with wire-like active regions," Optics Express 34(8), pp. 15124-15139, 2026.4. https://dx.doi.org/10.1364/OE.590003
C. Zhang, K. Takahata, T. Hiraki, T. Aihara, S. Matsuo, and T. Kakitsuka, "Enhancing Single-Mode Stability and Dynamic Characteristics in Complex-Coupled Grating Wire-Like Active-Region Membrane Distributed Reflector Lasers," IEEE J. Quantum Electron. 61(3), 2100111, 2025.6. http://dx.doi.org/10.1109/jqe.2025.3567583

Photon–photon resonance directly modulated lasers

S. Yamaoka, N.-P. Diamantopoulos, H. Nishi, R. Nakao, T. Fujii, K. Takeda, T. Hiraki, T. Tsurugaya, S. Kanazawa, H. Tanobe, T. Kakitsuka, T. Tsuchizawa, F. Koyama, and S. Matsuo, "Directly modulated membrane lasers with 108 GHz bandwidth on a high-thermal-conductivity silicon carbide substrate," Nat. Photon. 15(1), pp. 28-35, 2020.10.http://dx.doi.org/10.1038/s41566-020-00700-y

Membrane lasers and photonic crystal lasers

S. Matsuo and T. Kakitsuka, "Low-operating energy directly modulated lasers for short-distance optical interconnects," Advances in Optics and Photonics 10(3), pp. 567-643, 2018.8. http://dx.doi.org/10.1364/AOP.10.000567
K. Takeda, T. Sato, A. Shinya, K. Nozaki, W. Kobayashi, H. Taniyama, M. Notomi, K. Hasebe, T. Kakitsuka, and S. Matsuo“Few-fJ/bit data transmissions using directly modulated lambda-scale embedded active region photonic-crystal lasers," Nat. Photon. 7(7), pp. 569-575, 2013.5. http://dx.doi.org/10.1038/NPHOTON.2013.110
S. Matsuo, A. Shinya, T. Kakitsuka, K. Nozaki, T. Segawa, T. Sato, Y. Kawaguchi, and M. Notomi, "High-speed ultracompact buried heterostructure photonic-crystal laser with 13 fJ of energy consumed per bit transmitted," Nat. Photon. 4(9), pp. 648-654, 2010.8. http://dx.doi.org/10.1038/NPHOTON.2010.177

Optical modulators and optical amplifiers

T. Hiraki, T. Aihara, K. Hasebe, K. Takeda, T. Fujii, T. Kakitsuka, T. Tsuchizawa, H. Fukuda, and S. Matsuo. "Heterogeneously integrated III-V/Si MOS capacitor Mach-Zehnder modulator," Nat. Photon. 11(8), pp. 482-485, 2017.7. http://dx.doi.org/10.1038/NPHOTON.2017.120
T. Kakitsuka, Y. Shibata, M. Itoh, Y. Kadota, Y. Tohmori, and Y. Yoshikuni "Influence of Buried Structure on Polarization Sensitivity in Strained Bulk Semiconductor Amplifiers," IEEE J. Quantum Electron. 38(1), pp. 85-92, 2002.1. http://dx.doi.org/10.1109/3.973323

Modulated light sources for optical fiber communications

T. Kakitsuka, S. Matsuo, T. Segawa, Y. Shibata, Y. Kawaguchi, and R. Takahashi, "20-km transmission of 40 Gb/s signal using frequency modulated DBR laser," 2009 Optical Fiber Communication Conference (OFC 2009), OThG4, San Diego, 2009.3. http://dx.doi.org/10.1364/OFC.2009.OThG4
T. Kakitsuka and S. Matsuo, "High-speed frequency mopdulated DBR lasers for long-reach transmission," IEICE Trans. Electron. E92-C(7), p. 929-936, 2009.7. http://dx.doi.org/10.1587/transele.E92.C.929

Wavelength control and routing devices

T. Segawa, S. Matsuo, T. Kakitsuka, Y. Shibata, T. Sato, Y. Kawaguchi, Y. Kondo, and R. Takahashi, "All-optical wavelength-routing switch with monolithically integrated filter-free tunable wavelength converters and an AWG," Optics Express 18(5) pp. 4340-4345, 2010.3. http://dx.doi.org/10.1364/OE.18.004340
T. Kakitsuka, S. Matsuo, S-H. Jeong, T. Segawa, H. Okamoto, Y. Kawaguchi, Y. Kondo, Y. Yoshikuni, and H. Suzuki, "Design of a widely tunable laser with a chirped ladder filter,”Optical and Quantum Electronics, 38(12), pp. 1053-1060, 2006.9. https://doi.org/10.1007/s11082-006-9030-z

Theoretical analysis of electronic states in quantum dots

T. Saito, H. Ebe, Y. Arakawa, T. Kakitsuka, and M. Sugawara,"Optical polarization in columnar InAs/GaAs quantum dots: 8-Band k.p calculations", Phys. Rev. B 77(19), 195318-1-11, 2008.5. http://dx.doi.org/10.1103/PhysRevB.77.195318
T. Kakitsuka, T. Saito, T. Nakaoka, Y. Arakawa, H. Ebe, M. Sugawara, and Y. Yoshikuni, "Numerical analysis of transition energy shift in InAs/GaAs quantum dots induced by strain-reducing layers," Physica Stat Solidi (c), 0(4), pp.1157-1160, 2003.7. http://dx.doi.org/10.1002/pssc.200303026