Development of high-speed fiber optic networks for real-time multimedia communications

1993 ◽  
Author(s):  
Jian-Guo Zhang
Keyword(s):  
Real Time ◽  
High Speed ◽  
Fiber Optic ◽  
Multimedia Communications ◽  
Fiber Optic Networks

STARMAP: protocol for high-speed fiber optic networks

1993 ◽  
Author(s):  
Dave Irvine-Halliday ◽  
Abraham O. Fapojuwo ◽  
S. G. Pye
Keyword(s):  
High Speed ◽  
Fiber Optic ◽  
Fiber Optic Networks

Strained GaInAsP/InP multiple-quantum-well lasers for wideband analog and high-speed digital fiber-optic networks

1994 ◽  
Vol 7 (3) ◽  
pp. 152-159
Author(s):  
T. Fukushima ◽  
N. Matsumoto ◽  
H. Nakayama ◽  
Y. Ikegami ◽  
T. Namegaya ◽  
...  
Keyword(s):  
Quantum Well ◽  
High Speed ◽  
Fiber Optic ◽  
Multiple Quantum Well ◽  
Quantum Well Lasers ◽  
Multiple Quantum ◽  
Fiber Optic Networks

scholarly journals A High-Speed Demodulation Technology of Fiber Optic Extrinsic Fabry-Perot Interferometric Sensor Based on Coarse Spectrum

Sensors ◽  
2021 ◽  
Vol 21 (19) ◽  
pp. 6609
Author(s):  
Peng Zhang ◽  
Ying Wang ◽  
Yuru Chen ◽  
Xiaohua Lei ◽  
Yi Qi ◽  
...  
Keyword(s):  
Real Time ◽  
High Speed ◽  
Cavity Length ◽  
Fiber Optic ◽  
Likelihood Estimation ◽  
Time Dynamic ◽  
Wavelength Division ◽  
Broadband Spectrum ◽  
Fabry Perot ◽  
Interferometric Sensor

A fast real-time demodulation method based on the coarsely sampled spectrum is proposed for transient signals of fiber optic extrinsic Fabry-Perot interferometers (EFPI) sensors. The feasibility of phase demodulation using a coarse spectrum is theoretically analyzed. Based on the coarse spectrum, fast Fourier transform (FFT) algorithm is used to roughly estimate the cavity length. According to the rough estimation, the maximum likelihood estimation (MLE) algorithm is applied to calculate the cavity length accurately. The dense wavelength division multiplexer (DWDM) is used to split the broadband spectrum into the coarse spectrum, and the high-speed synchronous ADC collects the spectrum. The experimental results show that the system can achieve a real-time dynamic demodulation speed of 50 kHz, a static measurement root mean square error (RMSE) of 0.184 nm, and a maximum absolute and relative error distribution of 15 nm and 0.005% of the measurement cavity length compared with optical spectrum analyzers (OSA).

Design of Data Acquisition System for Fiber Optic Gyro Based on the FAT32 File System

2013 ◽  
Vol 365-366 ◽  
pp. 658-661
Author(s):  
Ying Bo Cai ◽  
Huan Zha ◽  
Xue Tong Wei
Keyword(s):  
Data Acquisition ◽  
Real Time ◽  
High Speed ◽  
Fiber Optic ◽  
High Reliability ◽  
Practical Significance ◽  
Fiber Optic Gyro ◽  
Fiber Optic Gyroscope ◽  
Time Data ◽  
Large Capacity

Demand for high-speed fiber optic gyroscope data acquisition and real-time record, the design of the SD Card as storage medium to large capacity fiber optic gyro high - speed real - time acquisition and bulk storage systems, The system by applying the sd2.0 protocol and fat32 file systems in the system, enable real - time Data Acquisition of fiber optic gyro and large capacity storage. Experiments have shown that the system properly designed, easy to use, high reliability to meet the actual demand, is of important practical significance.

Fiber-Optics Data Transmission for a Gyro Stabilized Platform

2014 ◽  
Vol 568-570 ◽  
pp. 1298-1302
Author(s):  
Di Han ◽  
Hai Xia Li
Keyword(s):  
Optical Fiber ◽  
Real Time ◽  
Fiber Optics ◽  
Data Transmission ◽  
High Speed ◽  
Fiber Optic ◽  
Optical Fiber Communication ◽  
Friction Torque ◽  
Transmission Link ◽  
Stabilized Platform

An optical fiber based data transmission link for a four-axis gyro stabilized inertial reference system is presented. The operation and configuration of the gyro stabilized platform is introduced to explain the requirement of data transmission. Four passive fiber optic rotary joints (FORJs) instead of traditional electrical sliprings are used to transmit optical signals between these relatively rotating gimbals. The hardware and software design of this optical fiber communication system operated at an updating rate of 1kHz are described to achieve high-speed, real-time, reliable data transmission. The experimental results show that the fiber optic rotary joint-based data transmission link is real-time and reliable. The use of FORJs as fiber optic sliprings will also result in an extremely low friction torque by comparing to electrical slipring assemblies. This allows the system designer to optimize the servo control performance for such high-precision gyro stabilized inertial reference systems.

scholarly journals Train-Induced Vibration Monitoring of Track Slab under Long-Term Temperature Load Using Fiber-Optic Accelerometers

Sensors ◽  
2021 ◽  
Vol 21 (3) ◽  
pp. 787
Author(s):  
Jianxiang Zhang ◽  
Wenzhu Huang ◽  
Wentao Zhang ◽  
Fang Li ◽  
Yanliang Du
Keyword(s):  
Real Time ◽  
High Speed ◽  
Fiber Optic ◽  
Vibration Response ◽  
Real Time Monitoring ◽  
High Speed Railway ◽  
Temperature Load ◽  
Track Slab ◽  
Train Induced Vibration

The train-induced vibration response provides a flexible solution for the real-time monitoring deformation of high-speed railway track slab in actual operation. This paper proposes a long-term real-time monitoring method for track slab deformation based on wavelet packet energy (WPE) using fiber optic accelerometers to record train-induced vibration. We found that the vibration response law of track slab deformation could be established by using the WPE of the frequency band covering the first- and second-order frequencies induced by the adjacent carriages. A field test was carried out for more than one year on the Beijing–Shanghai high-speed railway to investigate the train-induced vibration response law of track slab that was continuously deformed under a long-term temperature load. The maximum values of the WPE characteristic index appeared in winter and summer, and they were positively correlated with the temperature difference between the air environment and the track slab under the daily temperature load. These results were demonstrated to be consistent with the track slab deformation law for long-term and daily temperature loads. The novel method based on fiber optic accelerometers and WPE provides a new method for the long-term and real-time monitoring of track slab deformation.

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