The multipoint distribution system is the extensive wireless technology used to provide voice, data, Internet and video services. Residential and commercial customers have been assigned for that delivery of broadband services in a point-to-point or point-to-multipoint configuration. As a result of the propagation characteristics of the signals, the systems use a network architecture similar to the cellular one, although the services provided are fixed, not mobile.
In some cases, fiber distribution systems have the ability to connect multiple remote sites to a base station. A common application is that repeaters are based in a main building and other buildings, such as RF shielding areas and basements, all located in a few-mile repeater building. A and the repeater use the end of the head. A multiple fiber optic transceiver assembly in the base station is commonly called a “front end”. The far end of the fiber is called the “remote hub” computer.
We must pay attention that each fiber optic receiver output at the repeater site has individual pads to reduce the compound background noise. For example, if the 40 dB is used, an additional 80 dB of combiner port-to-port isolation occurs. In a real application it is a good idea to even consider the taps at the test point to read the RF levels. It is only used for testing and protection. A system similar to the one we use the WDM, if the number of fibers is reduced by 50%, but you must add a WDM at each remote site and another WDM for each fiber added at the repeater site. In the example of 4 remote sites, 8 WDM would be needed to operate all full duplex fibers and 4 fiber optic transmitters would have to be 1550nm models. So there is also a point that we must be careful. The fiber optic transceiver is not frequency selective and the same unit can receive 1330 or 1550 nm optical signals equally well. We also measure noise performance and are pleased to inform you that according to theory, optical splitters add virtually no noise. No matter which output we test, this means that your receiver connected to that network will also display very high quality readings.
When we use fiber optic links in the fiber distribution system, sometimes we need a fiber optic splitter to divide the signal it was carrying. The system designer has the option of dividing the RF or optical domain. The function of the optical splitter is familiar to the RF splitter. Other parts of the incoming fiber optic network are connected to the outgoing transmission, and the terminal device is connected and the other main part is its direct part. There are also dividers that divide the input into 2, 4, or more outputs. According to the structure and locations of fiber optic splitter, in fiber optic network, we need different splitter splitting ratios, such as 1 × 2, 1 × 4 and 1 × 8 splitter etc. In addition, unused single-mode fiber cable, specific products can see in 50m single-mode mode, can also strengthen the signal used for RF over fiber systems between connected buildings for data communication and spare fibers.