Real-Time Distributed Strain Monitoring of a Railway Bridge during Train Passage by Using a Distributed Optical Fiber Sensor Based on Brillouin Optical Correlation Domain Analysis
Table 3
Specifications of the components used in the distributed optical fiber sensor system.
System
Component
Parameter
Value
Optical system
LD
Output power Center wavelength Linewidth
80 mW 1550.12 nm 1 MHz
SSBM
Modulation speed Drive voltage Loss Max. input power
10 Gbit/s ≤3.5 V (port A, B), ≤7 V (port C) −18 dBm 10 dBm
EOM
Modulation speed Drive voltage Optical bandwidth Max. input power
10 Gbit/s ≤4 V pp ≥8 GHz 10 dBm
Microwave generator
Frequency range Sweep time Max. power
10~12 GHz ≥10 ms 16 dBm
EDFA
Input power Max. output power Operating wavelength
−6~3 dBm 27 dBm 1528~1562 nm
Photodetector
3 dB bandwidth Max. input power
DC ~ 125 MHz −15 dBm
Electrical system
LD current modulator
Max. input current Current modulation freq. Current modulation voltage
