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Branching Angle

The Experts below are selected from a list of 198 Experts worldwide ranked by ideXlab platform

Abdulaziz M. Al-hetar – 1st expert on this subject based on the ideXlab platform

  • Cosine bend-linear waveguide digital optical switch with parabolic heater
    Optics and Laser Technology, 2010
    Co-Authors: Ian Yulianti, Sevia M. Idrus, Abu Sahmah Mohd. Supa'at, Abdulaziz M. Al-hetar

    Abstract:

    Abstract A new digital optical switch (DOS) with large Branching Angle and short device length that exhibits low crosstalk and low power consumption is demonstrated. The Y-branch shape was optimized by introducing constant effective refractive index difference between branches (ΔNeff) along the propagation direction through beam propagation method (BPM) scheme. To provide decreasing local Branching Angle that results in the improvement of the crosstalk, two modified cosine bend was introduced to form the Y-branch. The modified cosine branch was then connected to a linear branch. The heater electrode was optimized so that the temperature fields induce a constant ΔNeff to satisfy initial assumption in designing the Y-branch shape. With Branching Angle of 0.299° and device length of only 5 mm, the simulation shows that the device could exhibits crosstalk of −33 dB at calculated required power of only 26 mW.

  • Cosine bend-linear waveguide digital optical switch with parabolic heater
    Optics and Laser Technology, 2010
    Co-Authors: Ian Yulianti, Abu Sahmah Mohd Supa'at, Sevia M. Idrus, Abdulaziz M. Al-hetar

    Abstract:

    A new digital optical switch (DOS) with large Branching Angle and short device length that exhibits low crosstalk and low power consumption is demonstrated. The Y-branch shape was optimized by introducing constant effective refractive index difference between branches (??Neff) along the propagation direction through beam propagation method (BPM) scheme. To provide decreasing local Branching Angle that results in the improvement of the crosstalk, two modified cosine bend was introduced to form the Y-branch. The modified cosine branch was then connected to a linear branch. The heater electrode was optimized so that the temperature fields induce a constant ??Neff to satisfy initial assumption in designing the Y-branch shape. With Branching Angle of 0.299?? and device length of only 5 mm, the simulation shows that the device could exhibits crosstalk of -33 dB at calculated required power of only 26 mW. ?? 2009 Elsevier Ltd. All rights reserved.

Ian Yulianti – 2nd expert on this subject based on the ideXlab platform

  • Cosine bend-linear waveguide digital optical switch with parabolic heater
    Optics and Laser Technology, 2010
    Co-Authors: Ian Yulianti, Sevia M. Idrus, Abu Sahmah Mohd. Supa'at, Abdulaziz M. Al-hetar

    Abstract:

    Abstract A new digital optical switch (DOS) with large Branching Angle and short device length that exhibits low crosstalk and low power consumption is demonstrated. The Y-branch shape was optimized by introducing constant effective refractive index difference between branches (ΔNeff) along the propagation direction through beam propagation method (BPM) scheme. To provide decreasing local Branching Angle that results in the improvement of the crosstalk, two modified cosine bend was introduced to form the Y-branch. The modified cosine branch was then connected to a linear branch. The heater electrode was optimized so that the temperature fields induce a constant ΔNeff to satisfy initial assumption in designing the Y-branch shape. With Branching Angle of 0.299° and device length of only 5 mm, the simulation shows that the device could exhibits crosstalk of −33 dB at calculated required power of only 26 mW.

  • Cosine bend-linear waveguide digital optical switch with parabolic heater
    Optics and Laser Technology, 2010
    Co-Authors: Ian Yulianti, Abu Sahmah Mohd Supa'at, Sevia M. Idrus, Abdulaziz M. Al-hetar

    Abstract:

    A new digital optical switch (DOS) with large Branching Angle and short device length that exhibits low crosstalk and low power consumption is demonstrated. The Y-branch shape was optimized by introducing constant effective refractive index difference between branches (??Neff) along the propagation direction through beam propagation method (BPM) scheme. To provide decreasing local Branching Angle that results in the improvement of the crosstalk, two modified cosine bend was introduced to form the Y-branch. The modified cosine branch was then connected to a linear branch. The heater electrode was optimized so that the temperature fields induce a constant ??Neff to satisfy initial assumption in designing the Y-branch shape. With Branching Angle of 0.299?? and device length of only 5 mm, the simulation shows that the device could exhibits crosstalk of -33 dB at calculated required power of only 26 mW. ?? 2009 Elsevier Ltd. All rights reserved.

Hoe J Yang – 3rd expert on this subject based on the ideXlab platform

  • optimality in the variation of average Branching Angle with generation in the human bronchial tree
    Annals of Biomedical Engineering, 2008
    Co-Authors: Min Y Kang, Hoe J Yang

    Abstract:

    In the human bronchial tree the Branching Angle becomes larger with generation or for the smaller branches. Previous theories based on single parameter optimization have not been successful at all in predicting the consistent increasing trend of Branching Angle with continued bifurcation. In this study a new theory for the optimality of the Branching Angle is proposed, which is based on the optimization between dual competing performances, the maximum space-filling capability at the expense of minimum energy loss. A large-Angle Branching gives an effect of delivering air into a new direction away from the preceding airways. It then has an effect of utilizing the lung volume with better uniformity, but at the same time inevitably requires a high pressure loss. It is shown in this paper that the ever increasing Branching Angle with generation can be well explained as the optimum Branching structure where the dual opposing performance of space filling and pressure loss is optimized. In estimating the pressure loss, Branching loss is considered in addition to the Poiseuille loss. Change of predicted optimum Branching Angle with generation shows an excellent agreement with the observed data found in the human conducting airways.