2010 IEEE International Conference on Communication Systems, 2010
ABSTRACT We present the demultiplexing and demodulation of 320 Gb/s OTDM-DQPSK signals using eith... more ABSTRACT We present the demultiplexing and demodulation of 320 Gb/s OTDM-DQPSK signals using either 'conventional', i.e. demultiplexing then detection, or coherent detections with the local oscillator operating in pulsed sequence. A continuous-wave local oscillator (LO) can be replaced by a short-pulse laser source in a homodyne coherent receiver enabling us simultaneously demultiplex and detect the multiplexed channels of the ultra-high speed OTDM phase modulated signals. Simulated results also indicate at least 5 dB improvement of the receiver sensitivity over the conventional technique by the pulsed LO coherent receiver.
Optical Fiber Communication Conference and National Fiber Optic Engineers Conference, 2009
We present the generation of multi-bound solitons of 2nd to 6th order states in a phase-modulatio... more We present the generation of multi-bound solitons of 2nd to 6th order states in a phase-modulation mode-locked fiber ring cavity. Temporal distribution and optical spectra confirm the differential phase states between adjacent solitons.
Conference on Lasers and Electro-Optics/International Quantum Electronics Conference, 2009
We report novel low bit rate non-line-of-sight optical free space communication over 200 km emplo... more We report novel low bit rate non-line-of-sight optical free space communication over 200 km employing forward scattering from clouds with 134 dB link loss and mid-path scatter gain of 10 dBi.
We demonstrate experimental generation of multi-bound solitons of up to sextuple in an active FM ... more We demonstrate experimental generation of multi-bound solitons of up to sextuple in an active FM mode-locked fiber ring laser operating under power saturation in the locking state. The ring laser consists of two booster optical amplifiers operating in saturation regime, an ...
In this paper, we present a modeling error driven adaptive controller for control of a robot with... more In this paper, we present a modeling error driven adaptive controller for control of a robot with unknown dynamics. In general, modeling error is not used since the ideal parameters are not known. However, using a feedback linearization approach we show that the modeling ...
In this paper, we consider a feedforward neural network for the control of a class of multi-input... more In this paper, we consider a feedforward neural network for the control of a class of multi-input, multi-output nonlinear systems. While feedforward neural networks offer a simple and appealing approach to enhance the trajectory tracking performance of the closed loop system, stability analysis is often more difficult than the conventional implementation of a neural network embedded within the feedback path.
2009 International Joint Conference on Neural Networks, 2009
Abstract In this paper, approximate dynamic programming (ADP) based design tools are developed fo... more Abstract In this paper, approximate dynamic programming (ADP) based design tools are developed for adaptive control of aircraft control under nominal and damaged conditions. Nominal control of the system is computed with a single network adaptive critic (SNAC) ...
Artificial recurrent neural network has been proved to be a valuable tool in modeling nonlinear d... more Artificial recurrent neural network has been proved to be a valuable tool in modeling nonlinear dynamical systems. Robustness study of recurrent neural network is critical to its successful implementation. The goal of robustness study is to reduce the sensitivity of modeling capability to parametric uncertainties or make the network fault tolerant. In this study, an uncertainty propagation analysis is performed
This paper expands on the hybrid control architecture developed at the NASA Ames Research Center ... more This paper expands on the hybrid control architecture developed at the NASA Ames Research Center by addressing issues related to indirect adaptation using the recursive least squares (RLS) algorithm. Specifically, the hybrid control architecture is an adaptive flight controller that features both direct and indirect adaptation techniques. This paper will focus almost exclusively on the modifications necessary to achieve quality
2010 IEEE International Conference on Communication Systems, 2010
ABSTRACT We present the demultiplexing and demodulation of 320 Gb/s OTDM-DQPSK signals using eith... more ABSTRACT We present the demultiplexing and demodulation of 320 Gb/s OTDM-DQPSK signals using either 'conventional', i.e. demultiplexing then detection, or coherent detections with the local oscillator operating in pulsed sequence. A continuous-wave local oscillator (LO) can be replaced by a short-pulse laser source in a homodyne coherent receiver enabling us simultaneously demultiplex and detect the multiplexed channels of the ultra-high speed OTDM phase modulated signals. Simulated results also indicate at least 5 dB improvement of the receiver sensitivity over the conventional technique by the pulsed LO coherent receiver.
Optical Fiber Communication Conference and National Fiber Optic Engineers Conference, 2009
We present the generation of multi-bound solitons of 2nd to 6th order states in a phase-modulatio... more We present the generation of multi-bound solitons of 2nd to 6th order states in a phase-modulation mode-locked fiber ring cavity. Temporal distribution and optical spectra confirm the differential phase states between adjacent solitons.
Conference on Lasers and Electro-Optics/International Quantum Electronics Conference, 2009
We report novel low bit rate non-line-of-sight optical free space communication over 200 km emplo... more We report novel low bit rate non-line-of-sight optical free space communication over 200 km employing forward scattering from clouds with 134 dB link loss and mid-path scatter gain of 10 dBi.
We demonstrate experimental generation of multi-bound solitons of up to sextuple in an active FM ... more We demonstrate experimental generation of multi-bound solitons of up to sextuple in an active FM mode-locked fiber ring laser operating under power saturation in the locking state. The ring laser consists of two booster optical amplifiers operating in saturation regime, an ...
In this paper, we present a modeling error driven adaptive controller for control of a robot with... more In this paper, we present a modeling error driven adaptive controller for control of a robot with unknown dynamics. In general, modeling error is not used since the ideal parameters are not known. However, using a feedback linearization approach we show that the modeling ...
In this paper, we consider a feedforward neural network for the control of a class of multi-input... more In this paper, we consider a feedforward neural network for the control of a class of multi-input, multi-output nonlinear systems. While feedforward neural networks offer a simple and appealing approach to enhance the trajectory tracking performance of the closed loop system, stability analysis is often more difficult than the conventional implementation of a neural network embedded within the feedback path.
2009 International Joint Conference on Neural Networks, 2009
Abstract In this paper, approximate dynamic programming (ADP) based design tools are developed fo... more Abstract In this paper, approximate dynamic programming (ADP) based design tools are developed for adaptive control of aircraft control under nominal and damaged conditions. Nominal control of the system is computed with a single network adaptive critic (SNAC) ...
Artificial recurrent neural network has been proved to be a valuable tool in modeling nonlinear d... more Artificial recurrent neural network has been proved to be a valuable tool in modeling nonlinear dynamical systems. Robustness study of recurrent neural network is critical to its successful implementation. The goal of robustness study is to reduce the sensitivity of modeling capability to parametric uncertainties or make the network fault tolerant. In this study, an uncertainty propagation analysis is performed
This paper expands on the hybrid control architecture developed at the NASA Ames Research Center ... more This paper expands on the hybrid control architecture developed at the NASA Ames Research Center by addressing issues related to indirect adaptation using the recursive least squares (RLS) algorithm. Specifically, the hybrid control architecture is an adaptive flight controller that features both direct and indirect adaptation techniques. This paper will focus almost exclusively on the modifications necessary to achieve quality
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Papers by Nhan Nguyen