Fiber optic cable is used to connect one electronic or optical device to another for signal routing. It transmits S/PDIF digital audio information in optical form (red light). Multimode cable is suitable for most general bi-directional fiber optic applications, such as installing and extending desktop network connections. Single-mode cable has a tight buffer that helps protect the cable's individual fibers when used in long runs.
fiber optics technician
A study provides new evidence that the same optical fibers that deliver high-speed internet and HD video to our homes could one day double as earthquake monitors.
Fiber-optic cables are the backbone of modern telecommunications, and we have demonstrated that we can turn existing networks into extensive seismic arrays to assess ground motions during earthquakes,” says first author Zack Spica, an assistant professor in the earth and environmental sciences department at the University of Michigan.
UNDERGROUND EARTHQUAKE SENSOR SYSTEM
Researchers conducted the study using a prototype array at Stanford University, where Spica was a postdoctoral fellow for several years.
“This is the first time that fiber-optic seismology has been used to derive a standard measure of subsurface properties that is used by earthquake engineers to anticipate the severity of shaking,” says coauthor Greg Beroza, professor in Stanford University’s School of Earth, Energy & Environmental Sciences.
To transform a fiber-optic cable into a seismic sensor, the researchers connect an instrument called a laser interrogator to one end of the cable. It shoots pulses of laser light down the fiber. The light bounces back when it encounters impurities along the fiber, creating a “backscatter signal” that is analyzed by a device called an interferometer.
fiber optics technician
A study provides new evidence that the same optical fibers that deliver high-speed internet and HD video to our homes could one day double as earthquake monitors.
Fiber-optic cables are the backbone of modern telecommunications, and we have demonstrated that we can turn existing networks into extensive seismic arrays to assess ground motions during earthquakes,” says first author Zack Spica, an assistant professor in the earth and environmental sciences department at the University of Michigan.
UNDERGROUND EARTHQUAKE SENSOR SYSTEM
Researchers conducted the study using a prototype array at Stanford University, where Spica was a postdoctoral fellow for several years.
“This is the first time that fiber-optic seismology has been used to derive a standard measure of subsurface properties that is used by earthquake engineers to anticipate the severity of shaking,” says coauthor Greg Beroza, professor in Stanford University’s School of Earth, Energy & Environmental Sciences.
To transform a fiber-optic cable into a seismic sensor, the researchers connect an instrument called a laser interrogator to one end of the cable. It shoots pulses of laser light down the fiber. The light bounces back when it encounters impurities along the fiber, creating a “backscatter signal” that is analyzed by a device called an interferometer.
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