Take measurements with the OTDR
All OTDRs will display the plot on a screen and provide two or more markers to locate at points on the screen, in order to measure the loss and distance. This can be used to measure the loss of the length of a fiber, in which case the OTDR will calculate the attenuation coefficient of the fiber or the loss of a connector or splice.
CH8-7
Fiber attenuation coefficient
To measure the length and attenuation of the fiber, we place the markers at any end of the section of the fiber we want to measure. The OTDR will calculate the distance difference between the two markers and provide the distance. It will also mark the difference between the power levels of the two points where the markers cross the path and calculate the loss or difference in the two power levels in dB. Finally, it will calculate the fiber's attenuation coefficient by dividing the loss by distance and will present the result in dB / km, the normal units for attenuation. If the fiber segment is loud or doesn't look straight,
Loss due to splices or connection
Fiber optic certifications
The OTDR measures the distance to the event and the loss in an event (a connector or splice) between the two markers. In order to measure the loss of the joint, move the two markers near the joint to be measured, and make sure they are approximately the same distance from the center of the joint. The OTDR will calculate the dB loss between the two markers and will give a dB loss reading.
Measurements of connector loss or splices with some reflectance will look very similar, with the exception that you will see a peak in the connector, produced by the reflection of the connector. The OTDR may also use a least squares method to reduce the effects of noise and eliminate the error caused by the loss of fiber between the two markers.
All OTDRs will display the plot on a screen and provide two or more markers to locate at points on the screen, in order to measure the loss and distance. This can be used to measure the loss of the length of a fiber, in which case the OTDR will calculate the attenuation coefficient of the fiber or the loss of a connector or splice.
CH8-7
Fiber attenuation coefficient
To measure the length and attenuation of the fiber, we place the markers at any end of the section of the fiber we want to measure. The OTDR will calculate the distance difference between the two markers and provide the distance. It will also mark the difference between the power levels of the two points where the markers cross the path and calculate the loss or difference in the two power levels in dB. Finally, it will calculate the fiber's attenuation coefficient by dividing the loss by distance and will present the result in dB / km, the normal units for attenuation. If the fiber segment is loud or doesn't look straight,
Loss due to splices or connection
Fiber optic certifications
The OTDR measures the distance to the event and the loss in an event (a connector or splice) between the two markers. In order to measure the loss of the joint, move the two markers near the joint to be measured, and make sure they are approximately the same distance from the center of the joint. The OTDR will calculate the dB loss between the two markers and will give a dB loss reading.
Measurements of connector loss or splices with some reflectance will look very similar, with the exception that you will see a peak in the connector, produced by the reflection of the connector. The OTDR may also use a least squares method to reduce the effects of noise and eliminate the error caused by the loss of fiber between the two markers.
No comments:
Post a Comment