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Beam Expander

The Experts below are selected from a list of 258 Experts worldwide ranked by ideXlab platform

S. Tsuji – 1st expert on this subject based on the ideXlab platform

  • Uncooled gain-coupled distributed-feedback lasers for low-cost transmitter modules
    Fifth Asia-Pacific Conference on … and Fourth Optoelectronics and Communications Conference on Communications, 1999
    Co-Authors: T.k. Sudoh, M. Komori, K. Uomi, H. Sato, M. Aoki, A. Taike, S. Tsuji

    Abstract:

    We review the recent progress of our BeamExpander integrated gain-coupled distributed-feedback laser which exhibits low operating current, stable single-mode operation, and low loss coupling into a single-mode fiber over the wide temperature range of -40 to 85/spl deg/C.

  • Improved high-temperature characteristics in a thickness-tapered 1.3-μm BeamExpander integrated ridge-waveguide laser
    IEEE Photonics Technology Letters, 1998
    Co-Authors: H. Sato, M. Takahashi, M. Komori, K. Uomi, M. Aoki, T. Tsuchiya, A. Taike, S. Tsuji

    Abstract:

    High-temperature performance of a BeamExpander (BEX) integrated laser was dramatically improved by reducing the current leakage in both longitudinal and lateral directions. Proton implantation into the BEX region and a reverse-mesa structure were combined to improve the high-temperature characteristics. A threshold current of 23.1 mA at 85/spl deg/C and a very high-characteristic temperature T/sub 0/ (25/spl deg/C-85/spl deg/C) of 74 K were achieved. Stable operation for over 3000 h under a 10-mW output power at 70/spl deg/C were confirmed.

  • reliable wide temperature range operation of 1 3 spl mu m Beam Expander integrated laser diode for passively aligned optical modules
    IEEE Journal of Selected Topics in Quantum Electronics, 1997
    Co-Authors: M. Aoki, M. Takahashi, M. Komori, K. Uomi, H. Sato, T. Tsuchiya, A. Taike, S. Tsuji

    Abstract:

    A novel structure for a 1.3-/spl mu/m BeamExpander integrated (BEX) laser diode is demonstrated. It combines a thickness-tapered InGaAsP-InP multiple quantum-well (QW) crystal grown by a novel silicon shadow masked metalorganic vapor phase epitaxy and a simple reverse-trapezoid-ridge waveguide laser structure that offers smooth mode field expansion and improved high-temperature lasing performance. We found this new BEX laser quite suitable for operation over a wide range of temperatures above 85/spl deg/C and highly efficient lens-free coupling to a single-mode fiber (SMF) of less than 3 dB. These excellent lasing properties along with reliability under severe environmental conditions make this BEX-LD a promising candidate for practical use for low-cost long-wavelength light-source modules using optical passive alignment techniques.

K. Uomi – 2nd expert on this subject based on the ideXlab platform

  • Wide temperature range operation of a 1.3-/spl mu/m BeamExpander integrated gain-coupled distributed feedback laser diode
    Technical Digest. CLEO Pacific Rim '99. Pacific Rim Conference on Lasers and Electro-Optics (Cat. No.99TH8464), 1999
    Co-Authors: H. Sato, M. Komori, M. Aoki, A. Taike, T.k. Sudoh, K. Uomi

    Abstract:

    Highly efficient fiber-laser coupling and wide-temperature-range (WTR) operation are desirable for the light sources used in low-cost optical modules. To improve the optical coupling efficiency, the integration of a BeamExpander (BEX) with laser diodes has been extensively studied. Moreover, a gain-coupled DFB-LD incorporating a current blocking grating has demonstrated high single-mode stability over a wide temperature range. Thus, the BEX integrated gain-coupled DFB-LD is quite promising for use in low-cost high-bit-rate optical modules. In this paper, we report a BEX integrated gain-coupled DFB laser with a current-blocking grating that can operate over a temperature range of -40 to 85/spl deg/C.

  • Uncooled gain-coupled distributed-feedback lasers for low-cost transmitter modules
    Fifth Asia-Pacific Conference on … and Fourth Optoelectronics and Communications Conference on Communications, 1999
    Co-Authors: T.k. Sudoh, M. Komori, K. Uomi, H. Sato, M. Aoki, A. Taike, S. Tsuji

    Abstract:

    We review the recent progress of our BeamExpander integrated gain-coupled distributed-feedback laser which exhibits low operating current, stable single-mode operation, and low loss coupling into a single-mode fiber over the wide temperature range of -40 to 85/spl deg/C.

  • Low driving current 1.3-/spl mu/m BeamExpander integrated laser diode with n-type modulation doped multiple quantum wells
    Conference Proceedings. 1998 International Conference on Indium Phosphide and Related Materials (Cat. No.98CH36129), 1998
    Co-Authors: H. Sato, M. Takahashi, M. Komori, M. Aoki, T. Tsuchiya, A. Taike, K. Uomi

    Abstract:

    The driving current of a 1.3-/spl mu/m BeamExpander (BEX) integrated laser diode was dramatically reduced by using n-type modulation doped multiple-quantum-well active layer. The threshold current at 85/spl deg/C was 28.0 mA and the slope efficiency was 0.3 W/A. In a temperature range from -30/spl deg/C to 85/spl deg/C, a record high characteristic temperature T/sub 0/ of 86. 1 K and the slope efficiency degradation /spl Delta//spl eta/ as low as (-30/spl deg/C-85/spl deg/C)-1.6 dB were achieved.

M. Komori – 3rd expert on this subject based on the ideXlab platform

  • Wide temperature range operation of a 1.3-/spl mu/m BeamExpander integrated gain-coupled distributed feedback laser diode
    Technical Digest. CLEO Pacific Rim '99. Pacific Rim Conference on Lasers and Electro-Optics (Cat. No.99TH8464), 1999
    Co-Authors: H. Sato, M. Komori, M. Aoki, A. Taike, T.k. Sudoh, K. Uomi

    Abstract:

    Highly efficient fiber-laser coupling and wide-temperature-range (WTR) operation are desirable for the light sources used in low-cost optical modules. To improve the optical coupling efficiency, the integration of a BeamExpander (BEX) with laser diodes has been extensively studied. Moreover, a gain-coupled DFB-LD incorporating a current blocking grating has demonstrated high single-mode stability over a wide temperature range. Thus, the BEX integrated gain-coupled DFB-LD is quite promising for use in low-cost high-bit-rate optical modules. In this paper, we report a BEX integrated gain-coupled DFB laser with a current-blocking grating that can operate over a temperature range of -40 to 85/spl deg/C.

  • Uncooled gain-coupled distributed-feedback lasers for low-cost transmitter modules
    Fifth Asia-Pacific Conference on … and Fourth Optoelectronics and Communications Conference on Communications, 1999
    Co-Authors: T.k. Sudoh, M. Komori, K. Uomi, H. Sato, M. Aoki, A. Taike, S. Tsuji

    Abstract:

    We review the recent progress of our BeamExpander integrated gain-coupled distributed-feedback laser which exhibits low operating current, stable single-mode operation, and low loss coupling into a single-mode fiber over the wide temperature range of -40 to 85/spl deg/C.

  • Low driving current 1.3-/spl mu/m BeamExpander integrated laser diode with n-type modulation doped multiple quantum wells
    Conference Proceedings. 1998 International Conference on Indium Phosphide and Related Materials (Cat. No.98CH36129), 1998
    Co-Authors: H. Sato, M. Takahashi, M. Komori, M. Aoki, T. Tsuchiya, A. Taike, K. Uomi

    Abstract:

    The driving current of a 1.3-/spl mu/m BeamExpander (BEX) integrated laser diode was dramatically reduced by using n-type modulation doped multiple-quantum-well active layer. The threshold current at 85/spl deg/C was 28.0 mA and the slope efficiency was 0.3 W/A. In a temperature range from -30/spl deg/C to 85/spl deg/C, a record high characteristic temperature T/sub 0/ of 86. 1 K and the slope efficiency degradation /spl Delta//spl eta/ as low as (-30/spl deg/C-85/spl deg/C)-1.6 dB were achieved.