Beam Expander

14,000,000 Leading Edge Experts on the ideXlab platform

Scan Science and Technology

Contact Leading Edge Experts & Companies

Scan Science and Technology

Contact Leading Edge Experts & Companies

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

S. Tsuji - One of the best experts 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 Beam-Expander 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 Beam-Expander 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 Beam-Expander (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 Beam-Expander 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.

  • 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 Beam-Expander 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.

  • laser diode integrated with a low radiation loss thickness tapered Beam Expander for highly efficient fiber coupling
    Optical Review, 1996
    Co-Authors: M. Takahashi, H. Sato, M. Aoki, Tsukuru Ohtoshi, S. Tsuji
    Abstract:

    The optimal structure of a laser diode monolithically integrated with a thickness-tapered Beam Expander waveguide is demonstrated by analyzing the relationship between fiber coupling efficiencies and radiation losses. It is also found that mode conversion loss is lowered in a ridge waveguide structure than in a buried hetero structure under equivalent fiber coupling. A fabricated ridge waveguide device based on this design shows threshold current as low as 16 mA and narrow Beam divergences of 13° and 12°.

K. Uomi - One of the best experts 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 Beam-Expander 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.

  • Wide temperature range operation of a 1.3-/spl mu/m Beam-Expander 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 Beam-Expander (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.

  • Low driving current 1.3-/spl mu/m Beam-Expander 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 Beam-Expander (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.

  • Improved high-temperature characteristics in a thickness-tapered 1.3-μm Beam-Expander 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 Beam-Expander (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.

  • Donor incorporation properties in an n-type modulation-doped Beam-Expander-integrated laser fabricated by shadow-mask growth
    Conference Proceedings. LEOS'98. 11th Annual Meeting. IEEE Lasers and Electro-Optics Society 1998 Annual Meeting (Cat. No.98CH36243), 1998
    Co-Authors: A. Taike, M. Komori, H. Sato, M. Aoki, T. Tsuchiya, K. Uomi
    Abstract:

    We investigated the donor incorporation properties in the Beam Expander (BEX) region of an n-type modulation doped (MD) MQW grown by both shadow mask growth (SMG) and selective area growth (SAG) from the viewpoint of the optical loss. As a result, we confirm that the donor concentration in the BEX region can be reduced for SMG, which is promising for decreasing the optical loss in the BEX region with keeping the MD effect in the gain region.

M. Komori - One of the best experts 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 Beam-Expander 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.

  • Wide temperature range operation of a 1.3-/spl mu/m Beam-Expander 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 Beam-Expander (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.

  • Low driving current 1.3-/spl mu/m Beam-Expander 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 Beam-Expander (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.

  • Improved high-temperature characteristics in a thickness-tapered 1.3-μm Beam-Expander 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 Beam-Expander (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.

  • Donor incorporation properties in an n-type modulation-doped Beam-Expander-integrated laser fabricated by shadow-mask growth
    Conference Proceedings. LEOS'98. 11th Annual Meeting. IEEE Lasers and Electro-Optics Society 1998 Annual Meeting (Cat. No.98CH36243), 1998
    Co-Authors: A. Taike, M. Komori, H. Sato, M. Aoki, T. Tsuchiya, K. Uomi
    Abstract:

    We investigated the donor incorporation properties in the Beam Expander (BEX) region of an n-type modulation doped (MD) MQW grown by both shadow mask growth (SMG) and selective area growth (SAG) from the viewpoint of the optical loss. As a result, we confirm that the donor concentration in the BEX region can be reduced for SMG, which is promising for decreasing the optical loss in the BEX region with keeping the MD effect in the gain region.

H. Sato - One of the best experts 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 Beam-Expander 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.

  • Wide temperature range operation of a 1.3-/spl mu/m Beam-Expander 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 Beam-Expander (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.

  • Low driving current 1.3-/spl mu/m Beam-Expander 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 Beam-Expander (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.

  • Improved high-temperature characteristics in a thickness-tapered 1.3-μm Beam-Expander 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 Beam-Expander (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.

  • Donor incorporation properties in an n-type modulation-doped Beam-Expander-integrated laser fabricated by shadow-mask growth
    Conference Proceedings. LEOS'98. 11th Annual Meeting. IEEE Lasers and Electro-Optics Society 1998 Annual Meeting (Cat. No.98CH36243), 1998
    Co-Authors: A. Taike, M. Komori, H. Sato, M. Aoki, T. Tsuchiya, K. Uomi
    Abstract:

    We investigated the donor incorporation properties in the Beam Expander (BEX) region of an n-type modulation doped (MD) MQW grown by both shadow mask growth (SMG) and selective area growth (SAG) from the viewpoint of the optical loss. As a result, we confirm that the donor concentration in the BEX region can be reduced for SMG, which is promising for decreasing the optical loss in the BEX region with keeping the MD effect in the gain region.

M. Takahashi - One of the best experts on this subject based on the ideXlab platform.

  • Numerical analysis of a Beam-Expander integrated laser diode by FD-TD method
    Technical Digest. CLEO Pacific Rim '99. Pacific Rim Conference on Lasers and Electro-Optics (Cat. No.99TH8464), 1999
    Co-Authors: M. Takahashi, T. Ohtoshi, K. Naono
    Abstract:

    A laser diode (LD) with narrow Beam divergence is attractive for a low cost subscriber light source module, since its high fiber-coupling efficiency enables lensless assembly. Integrating a Beam-Expander (BEX) with an LD is one of the most promising ways for decreasing Beam divergence of an LD. In this paper, we explicitly analyzed the reflection in a horizontally tapered BEX integrated with a LD by the finite-difference time-domain (FD-TD) method using massively parallel processors to reduce computation time.

  • Low driving current 1.3-/spl mu/m Beam-Expander 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 Beam-Expander (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.

  • Improved high-temperature characteristics in a thickness-tapered 1.3-μm Beam-Expander 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 Beam-Expander (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 Beam-Expander 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.

  • 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 Beam-Expander 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.

Related terms

Beam Expander - 15 days free trial to Access Experts & Abstracts