Search Results - "Numai, Takahiro"

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  1. 1

    Over 100 GHz 3-dB down bandwidth by direct modulation of a coupled cavity DFB-LD due to photon-photon resonance by Numai, Takahiro

    Published in Optical and quantum electronics (01-02-2021)
    “…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…”
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    Journal Article
  2. 2

    High resonance frequency in a coupled cavity DFB-LD with two phase-shifts by Numai, Takahiro

    Published in Optical and quantum electronics (2020)
    “…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…”
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    Journal Article
  3. 3

    Simulation of a ridge-type semiconductor laser with transversal diffraction gratings by Hirose, Tatsuhiro, Numai, Takahiro

    Published in Optical and quantum electronics (2022)
    “…This paper reports on improvement of stability of the fundamental horizontal transverse mode in a ridge-type semiconductor laser by incorporating transversal…”
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    Journal Article
  4. 4

    Simulation of a ridge-type semiconductor laser for separate confinement of horizontal transverse modes and carriers by Kato, Hiroki, Yoshida, Hazuki, Numai, Takahiro

    Published in Optical and quantum electronics (01-07-2013)
    “…A ridge-type semiconductor laser with selectively proton-implanted cladding layers for separate confinement of horizontal transverse modes and carriers is…”
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    Simulation of Ridge-Type Semiconductor Lasers with Selectively Proton-Implanted Cladding Layers by Yoshida, Hazuki

    Published in Japanese Journal of Applied Physics (01-01-2010)
    “…A ridge-type semiconductor laser with selectively proton-implanted cladding layers is proposed, and lasing characteristics are simulated. In this laser,…”
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    Journal Article
  7. 7

    High resonance frequency in a coupled cavity DFB-LD with phase-shifted/uniform gratings by photon-photon resonance by Numai, Takahiro

    Published in Optik (Stuttgart) (01-02-2020)
    “…To achieve high speed modulation of a semiconductor laser maintaining single longitudinal mode operation, a coupled cavity DFB-LD with phase-shifted/uniform…”
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    Journal Article
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    Analysis of Photon Recycling in Semiconductor Ring Lasers by Takahiro Numai, Takahiro Numai

    Published in Japanese Journal of Applied Physics (01-12-2000)
    “…Photon recycling in semiconductor ring lasers is theoretically analyzed. Dependence of threshold current, light output and modulation speed on photon recycling…”
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  12. 12

    Enhancement of resonance frequency in a DFB-LD with internally incident modulated light by Numai, Takahiro

    Published in Optik (Stuttgart) (01-10-2016)
    “…To achieve high speed modulation of a semiconductor laser maintaining single longitudinal mode operation, enhancement of resonance frequency in a DFB-LD with…”
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    Journal Article
  13. 13

    Semiclassical Approach in the Analysis of Ring Laser: I. Derivation of Rate Equations Including Backscattering and Interference by Yoshiyuki Shimosako, Yoshiyuki Shimosako, Takahiro Numai, Takahiro Numai

    Published in Japanese Journal of Applied Physics (01-07-2000)
    “…In research on ring lasers, backscattering has been analyzed by adding phenomenological coupling terms into rate equations. However, it has been difficult to…”
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    Journal Article
  14. 14

    Semiclassical Approach in the Analysis of Ring Laser: II. Mode Coupling due to Backscattering and Interference by Yoshiyuki Shimosako, Yoshiyuki Shimosako, Takahiro Numai, Takahiro Numai

    Published in Japanese Journal of Applied Physics (01-07-2000)
    “…In the research on ring lasers, the relationship between the lock-in phenomenon and backscattering was usually analyzed by treating the backscattered waves as…”
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    Journal Article
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    Analysis of a high density two-dimensional vertical-cavity surface emitting laser array by NUMAI, T

    Published in Japanese Journal of Applied Physics (01-10-1997)
    “…A two-dimensional vertical-cavity surface emitting laser array is expected to be a key device for parallel lightwave transmission and optical interconnection…”
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    Journal Article
  16. 16

    Dependence of total bandwidth and four-wave-mixing noises in FDM optical fiber transmission systems on the number of base units by Nishio, Tatsuya, Numai, Takahiro

    Published in Optics communications (01-01-2013)
    “…The purpose of this paper is to reduce the total bandwidth and four-wave-mixing (FWM) noises in frequency-division-multiplexing optical fiber transmission…”
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    Journal Article
  17. 17

    Simulation of a ridge-type semiconductor laser with horizontal coupling of lateral modes by Chai, Guowei, Numai, Takahiro

    Published in Optical and quantum electronics (01-10-2014)
    “…A ridge-type semiconductor laser with horizontal coupling of lateral modes is proposed, and lasing characteristics are simulated. A groove is formed in the…”
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    Journal Article
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    Simulation of a ridge-type semiconductor laser with partially formed anti-guiding cladding layers by Katsuragawa, Daiya, Numai, Takahiro

    Published in Optical and quantum electronics (01-07-2015)
    “…A ridge-type semiconductor laser with partially formed anti-guiding cladding layers is proposed, and lasing characteristics are simulated. With increases in…”
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    Journal Article
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    Reduction of four-wave-mixing noises in FDM optical fiber transmission systems in unequally spaced frequency allocations using base units by Nishio, Tatsuya, Numai, Takahiro

    Published in Optics communications (01-05-2013)
    “…The purpose of this paper is to reduce four-wave-mixing (FWM) noises with narrow total bandwidth in frequency-division-multiplexing optical fiber transmission…”
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    Journal Article