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

Abdulaziz M. Al-hetar - One of the best experts 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 - One of the best experts 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 - One of the best experts 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.

Kasmiran Jumari - One of the best experts on this subject based on the ideXlab platform.

  • optimum design of an optical waveguide determination of the Branching Angle of s bend waveguides
    Optik, 2020
    Co-Authors: Mohammad Syuhaimi Abrahman, Ainon Najahah Abd Aziz, Rosdiadee Nordin, Kasmiran Jumari
    Abstract:

    Abstract In this paper, the authors introduce a new expression to describe the Branching Angle of an s-bend waveguide. This expression is useful for designing s-bend waveguides because of the difficulty of determining the Branching Angle of such a waveguide. The optimum value of the Branching Angle leads to the optimization of output power, which contributes to high performance levels of optical devices. The waveguide was designed with a device designing tool that uses the beam propagation method (BPM) in modeling the design. Mathematical expressions are used to characterize the Branching Angle based on the available waveguide design parameters. The waveguide design is also integrated into the optical network to ensure the design’s compatibility with the network and to validate the overall performance of the optical device in the network. Based on the s-bend waveguide design, it has been found that its Branching Angle strongly depends on two parameters: the lateral offset of curve, h, and the length of the s-bend waveguide, L. The simulation results were analyzed to determine the optimum Branching Angle. The optimum value of the Branching Angle of the s-bend waveguide is 3.03°, with a produced output power of 96.9%. With the support of the two parameters, h and L, the Branching Angle from the equation obtained in this study is helpful in designing waveguides to produce high-performance optical devices.

  • Performance analysis of 1×2 optical power splitter
    WSEAS TRANSACTIONS on COMMUNICATIONS archive, 2010
    Co-Authors: Mohammad Syuhaimi Ab-rahman, Kasmiran Jumari, Foze Saleh Ater, Rahmah Mohammad
    Abstract:

    In this paper, the influence of the width of waveguide and the Branching Angle of the output arms on the output power of 1×2 optical splitter has been investigated in details. We showed that the output power is improved when the width increases for single mode transmission. In addition, at specified values the core and cladding refractive indices, approximately 50% input-to output power ratio is achieved at the output. Moreover, the output power can be controlled by adjusting the Branching Angle of the device.

Sevia M. Idrus - One of the best experts 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.