Tuesday, February 25, 2020

Analysis of the estimated optical loss of cable network links

Analysis of the estimated optical loss of cable network links
The estimated optical loss analysis is the calculation and verification of the operational characteristics of an optical fiber system. These include elements such as routing, electronics, wavelength, fiber type, and circuit length. Attenuation and bandwidth are the key parameters for the analysis of the estimated optical loss. The designer must analyze the loss of the links at the beginning of the design stage, before installing a fiber optic system, to ensure that the system will work with the proposed cable network.

In the calculation of the estimated optical loss, both the passive and active components of the circuit can be included. The passive loss is made up of the loss connection by the fiber, the connectors, and the splices. Do not forget the couplers and splices on the link. If system electronics have already been chosen, active components such as wavelength, transmitter power, receiver sensitivity, and dynamic range can be considered. If not yet chosen, the industry-standard or generic loss values ?? can be used for the estimated optical loss. Before starting the system,

The purpose of the estimated optical loss is to ensure that the network equipment will work on the installed fiber optic link. It is logical to be conservative when it comes to specifications. Do not use the best possible specifications for the estimated optical loss of the fibers or the loss per connection in order to leave a margin for the degradation of the components and the installation over time.
How much does a fiber optic technician make
The best way to show how the estimated optical loss is calculated is with an example that illustrates how this calculation is performed for a typical cable network. In this case, it is a two-kilometer multimode / single-mode hybrid link with five connections (two connectors on each end and three connections on the link connection panels) and a splice in the middle. The following figure shows the link design and instantaneous power at any point along with the entire link, drawn to scale to match the drawing of the link above.

As a general rule, the link loss margin should be greater than approximately 3 dB, so that the degradation of the links over time is contemplated. The LEDs on the transmitter can wear out and lose power, the connectors or splices can be degraded or the connectors can get dirty if they are open in case of re-routing or testing. If the cables were accidentally cut, the excess margin will be necessary for the splices to have restoration capacity.

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