The proceedings contain 33 papers. The topics discussed include: characterization of an all-optical clock recovery figure-eight laser for systems applications;simplified tuned optical receivers for use in lightwave op...
The proceedings contain 33 papers. The topics discussed include: characterization of an all-optical clock recovery figure-eight laser for systems applications;simplified tuned optical receivers for use in lightwave optical subcarrier multiplex systems;improved formulation for optically preamplified PPM receivers incorporating timing jitter effects;photonic switch size limitations imposed by phase noise from semiconductor optical amplifiers;widely tunable source generating subpicosecond pulses at 1550 nm;description of all-opticalnetwork test bed and applications;digital pulse interval and width modulation for optical fiber communications;design and realization of a suboptimum presynchronization filtering strategy for optical receivers;controlled switching of solitons in fiber nonlinear directional couplers;and comparison and classification of all-optical CDMA systems for future telecommunicationnetworks.
The proceedings contains 29 papers from the conference on allopticalcommunicationsystems: architecture, control, and networkissues II. Topics discussed include: optically preamplified receivers using resonant phot...
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The proceedings contains 29 papers from the conference on allopticalcommunicationsystems: architecture, control, and networkissues II. Topics discussed include: optically preamplified receivers using resonant photodiodes;pulse modulation for a subcarrier-multiplexed optical fiber transmission system;digital pulse interval modulation for transmission over optical fiber with direct detection;planar networks;optimal control of all-opticalcommunication soliton systems;and eliminating four-wave-mixing crosstalk in wavelength-division-multiplexing systems.
The proceedings contains 33 papers. Some of the specific topics discussed are: widely tunable source generating picosecond pulses at 1550 nm;description of all-opticalnetwork test bed and applications;asymmetry of fr...
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ISBN:
(纸本)0819419788
The proceedings contains 33 papers. Some of the specific topics discussed are: widely tunable source generating picosecond pulses at 1550 nm;description of all-opticalnetwork test bed and applications;asymmetry of free space optical links;compressed HDTV over the optical fiber network using PPM CDMA;Kautz topologies for all-optical self-routing networks;and pulse-time modulation for subcarrier-multiplexed systems.
The proceedings contain 31 papers. The topics discussed include: concept and architecture of indoor optical wireless multimedia systems;supervisory system and data communication channel for WDM-based transmission syst...
The proceedings contain 31 papers. The topics discussed include: concept and architecture of indoor optical wireless multimedia systems;supervisory system and data communication channel for WDM-based transmission systems;management in the WDM all-opticalnetwork;switch setting algorithms for the optical N-gon prism switch;automatic test station for network synchronization performance characterization;CATO: a CAD tool for intelligent design of opticalnetworks and interconnects;minimal-disturbance topology reconfiguration in all-opticalnetworks;throughput of optical broadcast star networks with delay constraints;full service access network-experimental realisation and performance;optimization of broadband optical access networks for residential and small business users;embedded real time control of optically amplified repeaters in broadband access networks;physical layer dimensioning of superPON architectures;and scheduling in unidirectional WDM rings and its extensions.
Coherent detection has emerged as a key technology for advancing passive opticalnetworks (PON) beyond 100 Gbps per wavelength, due to its advantages over the intensity and direct-detection (IM/DD) approach, which was...
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Dysarthria is a neurological condition resulting from impairments affecting muscle control involved in speech articulation, leading to reduced intelligibility or unintelligible speech, which affects communication abil...
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Dysarthria is a neurological condition resulting from impairments affecting muscle control involved in speech articulation, leading to reduced intelligibility or unintelligible speech, which affects communication abilities. Although Automatic Speech Recognition (ASR) technologies hold the potential to improve the lives of people with dysarthria significantly, ASR systems designed for normal speech have shown limited effectiveness when presented with impaired speech. Consequently, researchers have focused on developing ASR systems specifically tailored for dysarthria. However, progress in this area has been gradual due to the scarcity of dysarthric speech for training and the increased variability of speech among dysarthric individuals, necessitating a larger dataset of dysarthric utterances. One potential solution to enhance the robustness of dysarthric ASR is to deepen the architecture of the acoustic model, which maps the speech signal to words or phonetic units. However, deeper architectures require more training data and pose challenges in dealing with issues such as the vanishing gradient problem and representational bottlenecks in deep learning models. In this study, we expanded on our previous findings and investigated the applications of Depthwise Separable Convolution neurons and the inclusion of Residual Connections to propose a deep dysarthric acoustic model, tackling both vanishing gradients and representational bottleneck issues in dysarthric ASR. Multiple speaker-adaptive dysarthric ASRs were trained and evaluated for 15 UA-Speech dysarthric subjects, then benchmarked against the state-of-the-art and our previous dysarthric ASRs. Our proposed architectures have delivered up to 22.58% word recognition rate (WRR) improvements over the reference models. We observed an average of 10.81% better WRRs over the base traditional dysarthric ASR for all speakers. Likewise, the proposed acoustic model outperformed the state-of-the-art Transformer-based dysarthric
Satellite constellations have the potential for enabling globe-spanning quantum networks for secure communication, entanglement distribution, and eventually the quantum internet. The architecture, design, and operatio...
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We describe the design and performance of a wide-area all-opticalnetwork. An improved model of the benefits of wavelength changers in all-optical mesh networks is presented and comparisons are made to simulations. Th...
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ISBN:
(纸本)0819419788
We describe the design and performance of a wide-area all-opticalnetwork. An improved model of the benefits of wavelength changers in all-optical mesh networks is presented and comparisons are made to simulations. The model is shown to be accurate for a moderate number of wavelengths and a small blocking probability for a variety of networks.
Currently, the developed bi-directional broadband Passive opticalnetworks (PONs) have a maximum splitting factor around 32 and a range less than 20km. Due to the expected switching node consolidation the access netwo...
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This paper shows the state of the art in fiber optical code-division multiple-access (CDMA). Recent work in this area for both, systems and sequences is reviewed and analyzed. For that purpose a classification of syst...
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ISBN:
(纸本)0819419788
This paper shows the state of the art in fiber optical code-division multiple-access (CDMA). Recent work in this area for both, systems and sequences is reviewed and analyzed. For that purpose a classification of systems, corresponding to the manner of signal processing and a classification of known (0,1)-sequences are presented. It is shown that due to the limits by currently available device technology especially two techniques are promising for implementation in broadband telecommunicationnetworks: spectral encoding with integrated optical filters and CDMA in combination with wavelength multiple access schemes. Further an overview about some important experiments in this field is given.
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