Signal processing method, equipment and system for passive optical network (PON)

Abstract

The embodiment of the invention relates to a signal processing method, signal processing equipment and a signal processing system for a passive optical network (PON). The signal processing method for the PON comprises the following steps of: performing baseband coding on a received service signal; modulating the service signal subjected to baseband coding to an allocated orthogonal frequency division multiple access (OFDMA) subcarrier in an orthogonal frequency division multiplexing (OFDM) modulation mode; performing digital-to-analog conversion on the modulated OFDMA subcarrier to acquire an electric domain OFDMA signal; modulating the electric field OFDMA signal to an uplink optical signal to acquire an optical domain OFDMA signal; and sending the optical domain OFDMA signal. In the embodiment of the invention, continuous optical signals can be acquired in the OFDMA modulation mode, and can perform optical power compensation so as to support remote transmission; and compared with equipment for transmitting and receiving a burst signal, equipment for transmitting and receiving the continuous signals is low in cost, so that the construction cost of the network is reduced.

Description

technical field [0001] The embodiments of the present invention relate to the technical field of communications, and in particular to a signal processing method, device and system for a passive optical fiber network. Background technique [0002] Passive Optical Network (PON for short) is a broadband optical access technology and a point-to-multipoint physical topology. figure 1 is a schematic structural diagram of an existing PON network, such as figure 1 As shown, the PON network consists of an optical line terminal (Optical Line Terminal, referred to as: OLT), a passive optical distribution network (Optical Distribution Network, referred to as: ODN) and a plurality of optical network units (Optical Network Unit, referred to as: ONU) composition. Among them, multiple ONU1s share fiber resources and OLT2 ports; ODN3 passively connects one OLT2 and one or more ONU1s, and the optical branch point 4 in ODN2 does not need active node equipment, a passive optical splitter 4 c...

AI Technical Summary

Problems solved by technology

[0009] The PON with WDM and TDM mixed is TDMA+WDMA in the uplink direction, and its performance mainly depends on the inherent performance of TDMA, such as: logical distance, physical distance and other limitations, and the transmission distance of PON with WDM and TDM mixed depends entirely on the adopted The physical transmission distance of TDM PON; due to the burst frame structure of uplink TDMA, it is difficult to realize optical power compensation in the uplink direction, whether it is Erbium-doped Optical Fiber Amplifier (EDFA for short) or semiconductor optical amplifier ( Semiconductor Optical Amplifier, referred to as: SOA) are difficult to complete, unable to achieve long-distance transmission

In addition, the TDMA method is adopted for a single wavelength. In the upstream direction, the receiving end of the OLT needs a burst transmitter, and the ONU also needs to have a burst transmitter, and the network construction cost is high.

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