Fiber Optic Signal Measuring
To find information on how to measure signals from fiber optic sensors. This information will help assists the testing of an embeded fiber optic cable so as to determine if it works properly after embedding.
- Optical Time Domain Reflectometer (OTDR) is an "instrument that is used to create a virtual 'picture' of a fiber optic cable route. The analyzed data can provide insight into the integrity of the fibers, as well as any passive optical component such as the connections, splices, splitters, and multiplexers along the cable path."
- Once the information has been captured, analyzed and stored, it can be recalled in future to evaluate the degradation of the same fiber optic cable over time.
- The OTDR is the only tool that is capable of troubleshooting any fiber optic cable failures by locating the distance to the fault and identifying the type of fault such as breaks, bends or any excessive loss.
- There are two types of OTDR instruments i.e. hand-held OTDR, which is portable and rack-mounted OTDR, which can be placed for permanent monitoring in the network such that an alarm can be triggered if the fiber is compromised.
- Common issues that are detected by OTDRs include "signal loss due to connector problems, fiber bends, crushes, and breaks."
- OTDRs can also be used to predict breaks and monitor fiber health by making temperature and strain measurements.
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