The Experts below are selected from a list of 1905 Experts worldwide ranked by ideXlab platform

K.a. Shore - One of the best experts on this subject based on the ideXlab platform.

  • Synchronisation regimes in chaotic optical communication systems
    IEE Proceedings - Optoelectronics, 2003
    Co-Authors: Iestyn Pierce, Paul S. Spencer, S Sivaprakasam, Angel Valle, Paul Rees, K.a. Shore
    Abstract:

    A careful comparison is made between experimental results and two models describing optical synchronisation of chaotic external cavity semiconductor lasers. It is demonstrated that optical synchronisation regimes for chaotic semiconductor lasers in a Master-Slave Configuration are dependent both on the frequency detuning between the Master and Slave lasers and also on the Slave laser output power.

  • VCSEL polarization control by optical injection
    Journal of Lightwave Technology, 2003
    Co-Authors: S. Bandyopadhyay, Paul S. Spencer, Yanhua Hong, K.a. Shore
    Abstract:

    The stability of the polarization-resolved (PR) light output of a commercial vertical-cavity surface-emitting laser (VCSEL) has been studied with and without the presence of external optical injection in a Master-Slave Configuration. Pulsations in the PR light output are observed in the solitary laser at certain bias current. It has been observed here for the first time that optical injection can stabilize the polarization of a VCSEL operating in a pulsation regime.

  • message encoding and decoding using chaotic external cavity diode lasers
    IEEE Journal of Quantum Electronics, 2000
    Co-Authors: S Sivaprakasam, K.a. Shore
    Abstract:

    Synchronization of chaotic external-cavity diode lasers has been studied in a Master-Slave Configuration. A message is encoded into the chaotic Master laser by amplitude modulation and transmitted to the Slave laser. A scheme for decoding the message at the Slave is demonstrated.

  • Master-Slave Configuration for VCSEL synchronisation
    1998
    Co-Authors: Paul S. Spencer, Claudio R. Mirasso, Pere Colet, K.a. Shore
    Abstract:

    The possibility of implementing secure optical communication systems based on chaotic data encryption has recently stimulated interest in controlling and synchronising chaotic dynamics in lasers [1] and, in particular, in semiconductor lasers [2-4] where chaos control techniques can also be used for ensuring immunity to coherence collapse [5].

  • Modeling of optical synchronization of chaotic external-cavity VCSELs
    IEEE Journal of Quantum Electronics, 1998
    Co-Authors: Paul S. Spencer, Claudio R. Mirasso, Pere Colet, K.a. Shore
    Abstract:

    The performance of a Master-Slave Configuration for effecting the synchronization of chaotic vertical-cavity surface-emitting lasers (VCSELs) is studied using numerical simulations. The dynamical evolution of optically coupled VCSELs is examined using a traveling wave model which is valid in the strong optical feedback regime. It is shown that the proposed Configuration is capable of effecting synchronization in a robust manner. The opportunity for exploiting synchronized chaos in secure optical communication systems is indicated.

Mo Jamshidi - One of the best experts on this subject based on the ideXlab platform.

  • teleoperation by using nonisomorphic mechanisms in the Master Slave Configuration for speed control
    IEEE Systems Journal, 2018
    Co-Authors: Amit Shukla, Hamad Karki, Laxmidhar Behera, Mo Jamshidi
    Abstract:

    This paper presents modeling, simulation, and control of a novel teleoperated mechanism, where two nonisomorphic manipulators are used in one integrated system, with the purpose of usage in oil and gas industry in the future. Overall integration of the teleoperated system has been done in the Master–Slave Configuration, where a stuart-type 6-DOF parallel manipulator is used as a Master robot and a 6-DOF serial manipulator is used as a Slave robot. Since the parallel manipulator has a closed-loop structure and serial manipulator is an open-loop structure, their work spaces are of completely different nature in terms of overall shape and size. A novel task-space mapping mechanism has been proposed in this work to integrate these two completely nonidentical manipulators. Damped least-squares (DLS) method is used for overcoming the singularity of proposed task-space mapping matrix. This paper also presents detailed dynamic modeling of the parallel manipulator along with comprehensive analysis of proposed novel control technique. The biggest benefit of using proposed integration mechanism is the fullest access of the complete cartesian task spaces of both the Master and Slave manipulators. This paper also proposes usage of lag compensator for the improved tracking performance. Multilevel control architecture with local actuator-space and joint-space controllers, for the parallel and serial manipulators, respectively, has also been presented in this work.

  • Teleoperation by Using Nonisomorphic Mechanisms in the Master–Slave Configuration for Speed Control
    IEEE Systems Journal, 2018
    Co-Authors: Amit Shukla, Hamad Karki, Laxmidhar Behera, Mo Jamshidi
    Abstract:

    This paper presents modeling, simulation, and control of a novel teleoperated mechanism, where two nonisomorphic manipulators are used in one integrated system, with the purpose of usage in oil and gas industry in the future. Overall integration of the teleoperated system has been done in the Master–Slave Configuration, where a stuart-type 6-DOF parallel manipulator is used as a Master robot and a 6-DOF serial manipulator is used as a Slave robot. Since the parallel manipulator has a closed-loop structure and serial manipulator is an open-loop structure, their work spaces are of completely different nature in terms of overall shape and size. A novel task-space mapping mechanism has been proposed in this work to integrate these two completely nonidentical manipulators. Damped least-squares (DLS) method is used for overcoming the singularity of proposed task-space mapping matrix. This paper also presents detailed dynamic modeling of the parallel manipulator along with comprehensive analysis of proposed novel control technique. The biggest benefit of using proposed integration mechanism is the fullest access of the complete cartesian task spaces of both the Master and Slave manipulators. This paper also proposes usage of lag compensator for the improved tracking performance. Multilevel control architecture with local actuator-space and joint-space controllers, for the parallel and serial manipulators, respectively, has also been presented in this work.

Paul S. Spencer - One of the best experts on this subject based on the ideXlab platform.

  • Synchronisation regimes in chaotic optical communication systems
    IEE Proceedings - Optoelectronics, 2003
    Co-Authors: Iestyn Pierce, Paul S. Spencer, S Sivaprakasam, Angel Valle, Paul Rees, K.a. Shore
    Abstract:

    A careful comparison is made between experimental results and two models describing optical synchronisation of chaotic external cavity semiconductor lasers. It is demonstrated that optical synchronisation regimes for chaotic semiconductor lasers in a Master-Slave Configuration are dependent both on the frequency detuning between the Master and Slave lasers and also on the Slave laser output power.

  • VCSEL polarization control by optical injection
    Journal of Lightwave Technology, 2003
    Co-Authors: S. Bandyopadhyay, Paul S. Spencer, Yanhua Hong, K.a. Shore
    Abstract:

    The stability of the polarization-resolved (PR) light output of a commercial vertical-cavity surface-emitting laser (VCSEL) has been studied with and without the presence of external optical injection in a Master-Slave Configuration. Pulsations in the PR light output are observed in the solitary laser at certain bias current. It has been observed here for the first time that optical injection can stabilize the polarization of a VCSEL operating in a pulsation regime.

  • Master-Slave Configuration for VCSEL synchronisation
    1998
    Co-Authors: Paul S. Spencer, Claudio R. Mirasso, Pere Colet, K.a. Shore
    Abstract:

    The possibility of implementing secure optical communication systems based on chaotic data encryption has recently stimulated interest in controlling and synchronising chaotic dynamics in lasers [1] and, in particular, in semiconductor lasers [2-4] where chaos control techniques can also be used for ensuring immunity to coherence collapse [5].

  • Modeling of optical synchronization of chaotic external-cavity VCSELs
    IEEE Journal of Quantum Electronics, 1998
    Co-Authors: Paul S. Spencer, Claudio R. Mirasso, Pere Colet, K.a. Shore
    Abstract:

    The performance of a Master-Slave Configuration for effecting the synchronization of chaotic vertical-cavity surface-emitting lasers (VCSELs) is studied using numerical simulations. The dynamical evolution of optically coupled VCSELs is examined using a traveling wave model which is valid in the strong optical feedback regime. It is shown that the proposed Configuration is capable of effecting synchronization in a robust manner. The opportunity for exploiting synchronized chaos in secure optical communication systems is indicated.

Claudio R. Mirasso - One of the best experts on this subject based on the ideXlab platform.

  • Predict-prevent control method for perturbed excitable systems
    Physical Review E, 2009
    Co-Authors: Marzena Ciszak, Claudio R. Mirasso, Raúl Toral, Óscar Calvo
    Abstract:

    We present a control method based on two steps: prediction and prevention. For prediction we use the anticipated synchronization scheme, considering unidirectional coupling between excitable systems in a Master-Slave Configuration. The Master is the perturbed system to be controlled, meanwhile the Slave is an auxiliary system which is used to predict the Master's behavior. The prevention is obtained by sending a control signal to the Master system, which temporarily lowers its excitability threshold and prevents its future reaction to the external perturbation. We demonstrate theoretically and experimentally that an efficient control may be achieved.

  • Applications of Semiconductor Lasers to Secure Communications
    AIP Conference Proceedings, 2000
    Co-Authors: Claudio R. Mirasso
    Abstract:

    We numerically study the synchronization of two chaotic semiconductor lasers in a Master-Slave Configuration. To synchronize the lasers a small amount of the output power from the Master laser is injected into the Slave laser. We show that the output of the Master laser can be used as a chaotic carrier to encode a digital message which can be recovered at the receiver. We also check the quality of the synchronization diagram when the two lasers are slightly different.

  • Master-Slave Configuration for VCSEL synchronisation
    1998
    Co-Authors: Paul S. Spencer, Claudio R. Mirasso, Pere Colet, K.a. Shore
    Abstract:

    The possibility of implementing secure optical communication systems based on chaotic data encryption has recently stimulated interest in controlling and synchronising chaotic dynamics in lasers [1] and, in particular, in semiconductor lasers [2-4] where chaos control techniques can also be used for ensuring immunity to coherence collapse [5].

  • Modeling of optical synchronization of chaotic external-cavity VCSELs
    IEEE Journal of Quantum Electronics, 1998
    Co-Authors: Paul S. Spencer, Claudio R. Mirasso, Pere Colet, K.a. Shore
    Abstract:

    The performance of a Master-Slave Configuration for effecting the synchronization of chaotic vertical-cavity surface-emitting lasers (VCSELs) is studied using numerical simulations. The dynamical evolution of optically coupled VCSELs is examined using a traveling wave model which is valid in the strong optical feedback regime. It is shown that the proposed Configuration is capable of effecting synchronization in a robust manner. The opportunity for exploiting synchronized chaos in secure optical communication systems is indicated.

Amit Shukla - One of the best experts on this subject based on the ideXlab platform.

  • teleoperation by using nonisomorphic mechanisms in the Master Slave Configuration for speed control
    IEEE Systems Journal, 2018
    Co-Authors: Amit Shukla, Hamad Karki, Laxmidhar Behera, Mo Jamshidi
    Abstract:

    This paper presents modeling, simulation, and control of a novel teleoperated mechanism, where two nonisomorphic manipulators are used in one integrated system, with the purpose of usage in oil and gas industry in the future. Overall integration of the teleoperated system has been done in the Master–Slave Configuration, where a stuart-type 6-DOF parallel manipulator is used as a Master robot and a 6-DOF serial manipulator is used as a Slave robot. Since the parallel manipulator has a closed-loop structure and serial manipulator is an open-loop structure, their work spaces are of completely different nature in terms of overall shape and size. A novel task-space mapping mechanism has been proposed in this work to integrate these two completely nonidentical manipulators. Damped least-squares (DLS) method is used for overcoming the singularity of proposed task-space mapping matrix. This paper also presents detailed dynamic modeling of the parallel manipulator along with comprehensive analysis of proposed novel control technique. The biggest benefit of using proposed integration mechanism is the fullest access of the complete cartesian task spaces of both the Master and Slave manipulators. This paper also proposes usage of lag compensator for the improved tracking performance. Multilevel control architecture with local actuator-space and joint-space controllers, for the parallel and serial manipulators, respectively, has also been presented in this work.

  • Teleoperation by Using Nonisomorphic Mechanisms in the Master–Slave Configuration for Speed Control
    IEEE Systems Journal, 2018
    Co-Authors: Amit Shukla, Hamad Karki, Laxmidhar Behera, Mo Jamshidi
    Abstract:

    This paper presents modeling, simulation, and control of a novel teleoperated mechanism, where two nonisomorphic manipulators are used in one integrated system, with the purpose of usage in oil and gas industry in the future. Overall integration of the teleoperated system has been done in the Master–Slave Configuration, where a stuart-type 6-DOF parallel manipulator is used as a Master robot and a 6-DOF serial manipulator is used as a Slave robot. Since the parallel manipulator has a closed-loop structure and serial manipulator is an open-loop structure, their work spaces are of completely different nature in terms of overall shape and size. A novel task-space mapping mechanism has been proposed in this work to integrate these two completely nonidentical manipulators. Damped least-squares (DLS) method is used for overcoming the singularity of proposed task-space mapping matrix. This paper also presents detailed dynamic modeling of the parallel manipulator along with comprehensive analysis of proposed novel control technique. The biggest benefit of using proposed integration mechanism is the fullest access of the complete cartesian task spaces of both the Master and Slave manipulators. This paper also proposes usage of lag compensator for the improved tracking performance. Multilevel control architecture with local actuator-space and joint-space controllers, for the parallel and serial manipulators, respectively, has also been presented in this work.