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Shin Satoh - One of the best experts on this subject based on the ideXlab platform.

  • Sol-gel derived Ge-doped silica glass for Optical Fiber Application. II. Excess Optical loss
    Journal of Non-crystalline Solids, 1991
    Co-Authors: Kenzo Susa, Iwao Matsuyama, Shin Satoh
    Abstract:

    Abstract Optical Fibers of sol-gel derived germanium-doped silica core glasses are fabricated by the rod-in-tube method. Typical losses of the Fibers are 20 to 30 dB/km at a wavelength in the 0.63–0.83 μm region. Contributions of absorption and scattering losses to the total loss of the Fibers are examined. An excess absorption loss that increases with increasing germanium content is found in the Optical Fibers. The origin of the excess loss can be attributed to the transition metal impurities, the valence state of which is influenced by the divalent germanium ions in the Fibers.

  • Sol-gel derived Ge-doped silica glass for Optical Fiber Application: I. Preparation of gel and glass and their characterization
    Journal of Non-crystalline Solids, 1990
    Co-Authors: Kenzo Susa, Iwao Matsuyama, Shin Satoh, Tsuneo Suganuma
    Abstract:

    Abstract Ge-doped silica glass is synthesized by the sol-gel method starting with a mixture of metal alkoxides. Pore structures and consolidation behaviors of the Ge-doped gel are similar to those of non-doped silica gel. The consolidated glass tends to foam upon heating at a Fiber drawing temperature of > 2000 °C. The foaming tendency increases with dopant concentration, gel bulk density and heating rate of the consolidation. The most probable cause for the foaming is attributed to oxygen gas generated by thermal decomposition of localized germanium dioxide phase which presumably existed on the consolidated glass matrix.

Kenzo Susa - One of the best experts on this subject based on the ideXlab platform.

  • Sol-gel derived Ge-doped silica glass for Optical Fiber Application. II. Excess Optical loss
    Journal of Non-crystalline Solids, 1991
    Co-Authors: Kenzo Susa, Iwao Matsuyama, Shin Satoh
    Abstract:

    Abstract Optical Fibers of sol-gel derived germanium-doped silica core glasses are fabricated by the rod-in-tube method. Typical losses of the Fibers are 20 to 30 dB/km at a wavelength in the 0.63–0.83 μm region. Contributions of absorption and scattering losses to the total loss of the Fibers are examined. An excess absorption loss that increases with increasing germanium content is found in the Optical Fibers. The origin of the excess loss can be attributed to the transition metal impurities, the valence state of which is influenced by the divalent germanium ions in the Fibers.

  • Sol-gel derived Ge-doped silica glass for Optical Fiber Application: I. Preparation of gel and glass and their characterization
    Journal of Non-crystalline Solids, 1990
    Co-Authors: Kenzo Susa, Iwao Matsuyama, Shin Satoh, Tsuneo Suganuma
    Abstract:

    Abstract Ge-doped silica glass is synthesized by the sol-gel method starting with a mixture of metal alkoxides. Pore structures and consolidation behaviors of the Ge-doped gel are similar to those of non-doped silica gel. The consolidated glass tends to foam upon heating at a Fiber drawing temperature of > 2000 °C. The foaming tendency increases with dopant concentration, gel bulk density and heating rate of the consolidation. The most probable cause for the foaming is attributed to oxygen gas generated by thermal decomposition of localized germanium dioxide phase which presumably existed on the consolidated glass matrix.

Tsuneo Suganuma - One of the best experts on this subject based on the ideXlab platform.

Iwao Matsuyama - One of the best experts on this subject based on the ideXlab platform.

  • Sol-gel derived Ge-doped silica glass for Optical Fiber Application. II. Excess Optical loss
    Journal of Non-crystalline Solids, 1991
    Co-Authors: Kenzo Susa, Iwao Matsuyama, Shin Satoh
    Abstract:

    Abstract Optical Fibers of sol-gel derived germanium-doped silica core glasses are fabricated by the rod-in-tube method. Typical losses of the Fibers are 20 to 30 dB/km at a wavelength in the 0.63–0.83 μm region. Contributions of absorption and scattering losses to the total loss of the Fibers are examined. An excess absorption loss that increases with increasing germanium content is found in the Optical Fibers. The origin of the excess loss can be attributed to the transition metal impurities, the valence state of which is influenced by the divalent germanium ions in the Fibers.

  • Sol-gel derived Ge-doped silica glass for Optical Fiber Application: I. Preparation of gel and glass and their characterization
    Journal of Non-crystalline Solids, 1990
    Co-Authors: Kenzo Susa, Iwao Matsuyama, Shin Satoh, Tsuneo Suganuma
    Abstract:

    Abstract Ge-doped silica glass is synthesized by the sol-gel method starting with a mixture of metal alkoxides. Pore structures and consolidation behaviors of the Ge-doped gel are similar to those of non-doped silica gel. The consolidated glass tends to foam upon heating at a Fiber drawing temperature of > 2000 °C. The foaming tendency increases with dopant concentration, gel bulk density and heating rate of the consolidation. The most probable cause for the foaming is attributed to oxygen gas generated by thermal decomposition of localized germanium dioxide phase which presumably existed on the consolidated glass matrix.

Shu-woei Chiou - One of the best experts on this subject based on the ideXlab platform.

  • High-Performance 650 nm Resonant-Cavity Light-Emitting Diodes for Plastic Optical-Fiber Application
    Japanese Journal of Applied Physics, 2007
    Co-Authors: Yea-chen Lee, C. E. Lee, Bo Siao Cheng, Hao-chung Kuo, Shing-chung Wang, Shu-woei Chiou
    Abstract:

    AlGaInP-based resonant-cavity light-emitting diodes (RCLEDs) with high power and high speed have been fabricated. In this study, the RCLEDs were designed with different light-output aperture sizes 84, 60, and 40 µm, for different Applications on plastic Optical Fibers. Small-signal modulation bandwidths as high as 310 MHz at a forward current of 20 mA and an output power as high as 1.5 mW can be achieved for devices with 40 µm apertures. The devices with 84 µm apertures had an output power of more than 3.5 mW at a driving current of 20 mA and a maximum efficiency of over 12% with an epoxy-encapsulated package. The devices with 40 µm apertures satisfied with the IEEE 1394b s400 standard. Furthermore, the devices showed stable coupling efficiency for various currents and output powers at different ambience temperatures. In addition, the lifetime of devices is over 1300 h, and the power decay is less than 0.5 dB at 85 °C for a 40 mA driving current.

  • High-speed red RCLEDs and VCSELs for plastic Optical Fiber Application
    Light-Emitting Diodes: Research Manufacturing and Applications IX, 2005
    Co-Authors: Shu-woei Chiou, Yea-chen Lee, Chih-sung Chang, Tzer-peng Chen
    Abstract:

    To investigate the high performance light source for high-speed plastic Optical Fiber (POF) communication Application is important as high-speed short distance communication for the home networks becomes popular. It is straightforward to reduce the size of RCLEDs to increase the small-signal modulation bandwidth (f -3dB ). But reduce the size of RCLEDs not only reduce the output power but also decrease lifetime because higher current density flowed through active region. In this paper, we improve. f -3dB of RCLEDs with the aperture of 84μm by reducing the number of quantum wells (QWs) in active region. We found the speed of RCLED inverse proportional to the number of QWs. By reducing the number of QWs to one, the device with standard aperture size exhibits high f -3dB as 235MHz at bias current of 20mA without sacrificing the other performance like maximum output power, high temperature performance, etc. These devices can transmit data rate as high as 500Mb/sec through graded-index POF over 50 meters. Beyond 1Gbits/sec, we have investigated red VCSELs as suitable high-speed light sources. The structure of red VCSELs is similar to RCLEDs except more pairs of DBR yield high reflectivity. Our red VCSEL can have output power as high as 1.5mW at 5mA and transmission data rate up to 2.5Gbits/sec.

  • High-performance resonant cavity light-emitting diode for plastic Optical Fiber Application
    Light-Emitting Diodes: Research Manufacturing and Applications VIII, 2004
    Co-Authors: Shu-woei Chiou, Yea-chen Lee, Chih-sung Chang, Yung-chuan Yang, Tzer-perng Chen
    Abstract:

    Future in-house Multimedia networks, based on the IEEE 1394b standards, require low cost and robust Optical transmission system in the range of 100 meter. In this paper, we presented the state of the art 650 nm micro-cavity light emitting diodes (RCLEDs) for such Application. We had made RCLEDs with diameters of the emission window of 84, 60, 40μm for different requirements. Because of excellent epitaxy quality and structure design, our RCLEDs perform record high power and efficiency. With expoxy encapsulated, the 84μm devices give an efficiency of 12% and yield more than 3.5mW at operation current 20mA. Our 40μm devices exhibit high smallsignal modulation-bandwidths (f -3d ) as 310MHz at bias current of 20mA. The output power of 40μm devices is still as high as 1.5mW, which is suitable for IEEE 1394b s400 standard. On the other hand, we had developed metal bonding RCLEDs (MBRCLEDs) to improve the high temperature performance of RCLEDs. By proper design the structure and process, the MBRCLEDs can have very low power decay as 0.6dB from 20°C to 100°C.