Zobrazeno 1 - 10
of 291
pro vyhledávání: '"Takahiro Numai"'
Autor:
Tatsuhiro Hirose, Takahiro Numai
Publikováno v:
2022 International Conference on Numerical Simulation of Optoelectronic Devices (NUSOD).
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::00f71878aa7210324a1e4c9de8814c4b
https://doi.org/10.1109/nusod54938.2022.9894828
https://doi.org/10.1109/nusod54938.2022.9894828
Autor:
Tatsuhiro Hirose, Takahiro Numai
This paper reports on improvement of stability of the fundamental horizontal transverse mode in a ridge-type semiconductor laser by incorporating transversal diffraction gratings. Kinks do not appear in current versus light-output curves by appropria
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f5a8ba81f6168c4eea5d3399553671aa
https://doi.org/10.21203/rs.3.rs-977475/v1
https://doi.org/10.21203/rs.3.rs-977475/v1
Autor:
Takahiro Numai
Publikováno v:
Optical and Quantum Electronics. 53
This paper reports on 3-dB down bandwidth of 110.6 GHz by direct modulation of a coupled cavity DFB-LD with phase-shifted/uniform gratings due to photon-photon resonance when the injected current is 3.5 times the threshold current. The photon-photon
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e3e53fe3135e68dc63937b3f164edfe0
https://doi.org/10.1007/s11082-020-02713-x
https://doi.org/10.1007/s11082-020-02713-x
Autor:
Takahiro Numai
Publikováno v:
Optical and Quantum Electronics. 52
To realize a single-longitudinal-mode laser diode (LD) with high speed direct-modulation, a coupled cavity DFB-LD with two phase-shifts is proposed. From simulated results, it is expected that the resonance frequency of 71.3 GHz and the 3-dB down ban
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::955b86e6a838c3ba48f93221c9149026
https://doi.org/10.1007/s11082-020-02276-x
https://doi.org/10.1007/s11082-020-02276-x
Autor:
Takahiro Numai
Publikováno v:
2019 International Conference on Numerical Simulation of Optoelectronic Devices (NUSOD).
Enhancement of resonance frequency in a coupled cavity DFB-LD with asymmetric grating coupling coefficients by photon-photon resonance is reported. The resonance frequency is 61.3 GHz and the 3-dB down band width is 82.7 GHz when the injected current
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f01855c42c743701efba23cb900dbee5
https://doi.org/10.1109/nusod.2019.8806782
https://doi.org/10.1109/nusod.2019.8806782
Publikováno v:
Optik. 127:12078-12084
To enhance asymmetry in light output from front/rear facets in a resonance-shifted DFB-LD maintaining single longitudinal mode (SLM) operation, lasing characteristics of resonance-shifted DFB-LDs with asymmetric regions are simulated. The laser cavit
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::66e75d7143bbae5da9aedee8a6379f6c
https://doi.org/10.1016/j.ijleo.2016.10.009
https://doi.org/10.1016/j.ijleo.2016.10.009
Autor:
Kei-ichiro Ichikawa, Takahiro Numai
Publikováno v:
Optik. 127:6253-6257
To obtain asymmetric light output from front/rear facets in a semiconductor laser maintaining single longitudinal mode (SLM) operation, a resonance-shifted DFB-LD is proposed and its lasing characteristics are simulated. The laser cavity of the reson
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a656046d79d3bc5f3298570292799c06
https://doi.org/10.1016/j.ijleo.2016.04.090
https://doi.org/10.1016/j.ijleo.2016.04.090
High Resonance Frequency in a Coupled Cavity DFB-LD with Two Phase-Shifts by Photon-Photon Resonance
Autor:
Takahiro Numai
Publikováno v:
2018 International Conference on Numerical Simulation of Optoelectronic Devices (NUSOD).
Enhancement of resonance frequency in a coupled cavity DFB-LD with two phase-shifts by photon-photon resonance is reported. The resonance frequency is 71.3 GHz and the 3-dB down band width is 95.9 GHz when the injected current is 3.075 times the thre
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::26062e28c40d8e558bb7b9b4e3069732
https://doi.org/10.1109/nusod.2018.8570259
https://doi.org/10.1109/nusod.2018.8570259
Autor:
Takahiro Numai
Publikováno v:
2017 International Conference on Numerical Simulation of Optoelectronic Devices (NUSOD).
To achieve high speed modulation of a semiconductor laser maintaining single longitudinal mode operation, a coupled cavity DFB-LD with phase-shifted/uniform gratings is proposed and its lasing characteristics are simulated. The laser cavity of the DF
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4163d4255fe336aa16614a582c16507b
https://doi.org/10.1109/nusod.2017.8009978
https://doi.org/10.1109/nusod.2017.8009978
Autor:
Takahiro Numai, Daiya Katsuragawa
Publikováno v:
Optical and Quantum Electronics. 47:2161-2167
A ridge-type semiconductor laser with partially formed anti-guiding cladding layers is proposed, and lasing characteristics are simulated. With increases in the height and the width of the partially formed anti-guiding cladding layers, both kink-leve
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::620f48d9618607196c9edf45ea800a0f
https://doi.org/10.1007/s11082-014-0090-1
https://doi.org/10.1007/s11082-014-0090-1