scholarly journals Real-time experiment and numerical analysis of highly-survivable adaptive restoration for high-capacity optical signal transmission

2020 ◽  
Author(s):  
Hiroki Kawahara ◽  
Kohei Saito ◽  
Masahiro Nakagawa ◽  
Takashi Kubo ◽  
Takeshi Seki ◽  
...  
Keyword(s):  
Numerical Analysis ◽  
Real Time ◽  
Signal Transmission ◽  
High Capacity ◽  
Optical Signal ◽  
Adaptive Restoration

Measurement of frequency characteristics of disturbance torque in the process of satellite antenna rotation

2020 ◽  
Vol 64 (1-4) ◽  
pp. 1563-1569
Author(s):  
Bo Gao ◽  
Minglong Xu
Keyword(s):  
Real Time ◽  
Signal Transmission ◽  
Frequency Characteristics ◽  
Structural Vibration ◽  
Driving Mechanism ◽  
Satellite Antenna ◽  
Satellite Applications ◽  
Study Characteristics ◽  
Satellite Signal ◽  
Disturbance Torque

As an important equipment for satellite signal reception and transmission, the satellite antenna needs to be rotated in real time to achieve real-time tracking of the target and complete signal transmission during applications. Antenna driving mechanism is generally composed of motor and other components, which will cause some structural vibration during rotation. For high-stability satellite applications, the vibration disturbance torque is a major factor affecting the satellite stability. In order to study characteristics of the disturbance torque, the disturbance data from the antenna under different rotation conditions should be measured. In this paper, the frequency characteristics of disturbance torque of a rotating satellite antenna using stepper motor as driving motor is tested and discussed.

Acute detection of optical tissue changes in real-time during pulsed field ablation (PFA)

2020 ◽  
Vol 41 (Supplement_2) ◽  
Author(s):  
K.L Hong ◽  
O Amirana ◽  
T Ransbury ◽  
B Glover
Keyword(s):  
Real Time ◽  
Right Atrium ◽  
Optical Mapping ◽  
Energy Levels ◽  
Optical Signal ◽  
Lesion Formation ◽  
Pulsed Field ◽  
Tissue Changes ◽  
Rf Energy ◽  
The Right

Abstract Background It has been established in previous animal and human studies that it is possible to assess lesion formation in real-time using optical means during the application of radiofrequency (RF) energy in cardiac ablation procedures. The optical interrogation was accomplished using a novel catheter and instrument system whereby the catheter has embedded optical fibers that transmit and receive light from the instrument. Purpose The aim of this study was to see if there are similar indications of lesion formation, detected by the same optical means, during the application of pulsed field ablation (PFA) energy to cause lesions through electroporation. Methods A series of 3 anesthetized pigs underwent PFA in the right atrium. An 8-electrode circular catheter was placed high in the right atrium, near the superior vena cava, to simulate pulmonary vein isolation as part of an AF ablation procedure. The optical catheter was placed adjacent to the circular catheter between stimulation electrode pairs. A bolus of adenosine was administered to create a window of asystole to avoid stimulation on the T-wave. Bipolar PFA was delivered immediately post drug infusion and the optical signature from the catheter was recorded and displayed in real-time. Electrograms were recorded and the mapping of the lesion was performed with the optical catheter at the following time intervals post PFA delivery: 0 min, 15 min, 1 hour, and 3 hours. Necropsy and histology followed the procedure. Results The optical signal is distinctly higher in intensity during the PFA pulse train. The optical signal showed an immediate significant decrease and a slow but steady decay over the mapping interval. Electrogram reduction accompanied PFA application and also showed a marked reduction over the mapping interval. The optical signal amplitudes were markedly lower when on the lesion compared to healthy non-ablated myocardium as predicted. Conclusions Preliminary results indicate that optical mapping detects immediate tissue changes during PFA at these energy levels and hence could be is a viable method of evaluating lesion formation during and after PFA energy application. The optical signal indicates that cell damage occurs immediately at these energy levels and continues to progress slowly in lesions made by PFA energy compared to those made by RF energy. The findings also suggest that optical mapping can identify acute lesions made with PFA energy in real-time implying that optical mapping could evolve as a PFA gap detector. Funding Acknowledgement Type of funding source: None

scholarly journals Real-time experimental demonstration of
low-cost VCSEL intensity-modulated 1125Gb/s optical OFDM signal transmission over 25km PON systems

2011 ◽  
Vol 19 (4) ◽  
pp. 2979 ◽  
Author(s):  
E. Hugues-Salas ◽  
R.P. Giddings ◽  
X.Q. Jin ◽  
J. L. Wei ◽  
X. Zheng ◽  
...  
Keyword(s):  
Real Time ◽  
Low Cost ◽  
Signal Transmission ◽  
Experimental Demonstration ◽  
Intensity Modulated ◽  
Ofdm Signal ◽  
Optical Ofdm

scholarly journals Active Optical Signal Conditioning and Monitoring System

2021 ◽  
Author(s):  
Kalipada Chatterjee ◽  
Subrat Sahu ◽  
Venugopal Arumuru ◽  
Rajan jha
Keyword(s):  
Real Time ◽  
Signal To Noise Ratio ◽  
Optical Signal ◽  
Wide Frequency Range ◽  
Optical Systems ◽  
Signal Conditioning ◽  
Time Modulation ◽  
Response Enhancement ◽  
Signal Monitoring ◽  
External Stimuli

Abstract An optical signal conditioning technique for dynamic modulation of signals and real-time monitoring of events is pivotal for developing various optical systems at micro/nano dimensions. The utilities of such technique include controllable signal enhancement and distinctive response towards external stimuli, with reconfigurable operational range. Here, we propose and demonstrate an optical technique based on the parallel integration of fiber modal interferometers for optical response enhancement and multi-signal monitoring. Overlap of the interferometers’ characteristic spectra facilitates controllable signal filtering, attenuation, and amplification of interferometer’s response towards dynamic field over wide frequency range of 1 Hz – 1 kHz. Signal to noise ratio (SNR) enhancement of 9 dB is achieved by applying 1 volt about the reference interferometer. The system enables real-time modulation of optical signals and multipoint signal monitoring using machine learning for various applications such as mechanical vibrations, acoustic fields, biological samples, fluid movement, and other similar dynamic fields.

scholarly journals Designing Plasmonic Eigenstates for Optical Signal Transmission in Planar Channel Devices

ACS Photonics ◽  
2018 ◽  
Vol 5 (6) ◽  
pp. 2328-2335 ◽  
Author(s):  
Upkar Kumar ◽  
Sviatlana Viarbitskaya ◽  
Aurélien Cuche ◽  
Christian Girard ◽  
Sreenath Bolisetty ◽  
...  
Keyword(s):  
Signal Transmission ◽  
Optical Signal ◽  
Planar Channel

Development of a Machine Learning Based Algorithm to Identify the Main Types of Optical Signal Transmission Faults Between a Switch and an Optical Transceiver

2021 ◽  
Author(s):  
Aleksandr A. Kashtanov ◽  
Mihail E. Pazhetnov ◽  
Elena V. Kashtanova ◽  
Evgeniy S. Koptev ◽  
Igor A. Furiaev
Keyword(s):  
Machine Learning ◽  
Signal Transmission ◽  
Optical Signal
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