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Technology application and power operation of Epon

Technology application

Public Client Integrated Access

For public users, FTTH and Fttb/c/cab applications can be used.

Integrated access for major customers and business customers

For business users, different implementation patterns, such as Ftto, FTTB, or FTTC, can be adopted depending on the business requirements and the size of the user.

"Global eye" high bandwidth access

"Global Eye" and so on bandwidth (especially uplink bandwidth) require a relatively high application can use Epon as a means of access, the specific network mode as shown in Figure 5. Pon replaces the two/three layer switch in the original analog networking scheme, while also saving a large number of fiber transceivers, and does not require video optical transceiver devices.

Village Access

In the case of the shortage of optical fiber resources, such as village and village works, the use of multi-level light splitter and the power of the optical splitter, that is, in the case of only one core or a few core optical cable resources, the use of power unequal optical splitter point-by-node convergence.

Power budget

According to IEEE802.3AH-2004 's agreement: Olt side transmitting power is greater than 2dBm, receiving sensitivity <-27dbm; for ONU transmitting power is greater than -1dbm, receiving sensitivity <-24dbm, the entire optical link loss uplink <24db, downlink <23.5dB. Epon uplink 1310nm and downlink 1490nm wavelength in G. 652 fiber loss of about 0.3db/km. The fully visible power budget is the most important factor for long-distance epon. In order to improve the transmission distance, in addition to reducing the line insertion loss, you can also use optical amplification means to improve the optical power budget, including the following two types of methods: optical amplifiers and repeaters (OEO, optical-electrical-optical, photoelectric light). The optical amplifier scheme needs to be diplexer (WDM multiplexing/demultiplexing) and OA (Opticalamplifier, optical amplifiers) in the upper and lower directions, while OBF (optical bandpass filter, Optical bandpass filter) is optional, The use of OBF is mainly to overcome the spontaneous radiation effect of OA to provide better performance. The repeater scheme directly uses two optical modules back-to-back interconnect, and uses the local controller to control the luminous of the two light modules, thus achieves the simple OEO relay the goal, the cost is lower.