As a further continuation of topics discussed in Loss control in PON networks (GPON/GEPON/EPON) we need to add, that unique requirement for RF-video fiber transmission with analog modulated signaling is a loss variation control. To ensure that signal levels provide adequate video quality, it should be within the dynamic range of the RF video optical receiver. The main methods allowing PON to support analog video are illustrated in Figure 1. Following design of the distribution area must be applied to minimize loss variations:
- minimizing amount of optical connectors
- using optical splitters with enhanced uniformity over all outputs
- limiting PON to a single distribution area
To ensure that an analog video signal can arrive to each ONT on the PON, optical tests must be applied together with verification process.
In order to provide a vital approach for delivering analog video signals in the operating range, the combination of low uniformity splitters are used together with amplifiers with low variation in power and video receivers with wider dynamic range.
First part of this discussion – here: Loss control in PON networks (GPON/GEPON/EPON)