System and method of wavelength division multiplexing passive optical network for realizing broadcast functions

Abstract

The invention relates to a system and a method of a wavelength division multiplexing passive optical network for realizing broadcast functions. In the system, one optical line terminal (OLT) is connected with a remote node (RN) through a single mode fiber, and the remote node (RN) is connected with N optical network units (ONU), wherein the remote node (RN) mainly comprises one reflective fibber bragg gratting (FBG) and one NxN arrayed waveguide grating (AWG); broadcast signals sharing wavelengths are back reflected by the reflective fibber bragg gratting (FBG), shunt through a 1xN star coupler and then are carried to N input ports of the arrayed waveguide grating (AWG); the transmission of the broadcast signals and point-to-point signals is realized through the self characteristics of the arrayed waveguide grating (AWG); and the transmission of point-to-point uplink signals of the system is realized by utilizing a remodulation technology of a reflective semiconductor optical amplifier (RSOA). The invention realizes the transmission of the broadcast signals by only changing the structure of the system and achieves the balance between the cost and the property of the system.

Description

technical field [0001] The present invention relates to the field of optical communication, in particular to a system and method for realizing broadcasting function by wavelength division multiplexing passive optical network (WDM-PON). Background technique [0002] Wavelength division multiplexing passive optical network WDM-PON technology can upgrade the bandwidth without changing the physical infrastructure equipment, and greatly increase the transmission capacity of the network. It has broad application prospects in the optical access network and is considered to be the future of FTTx. The ultimate choice for evolution. WDM-PON allocates one (or a pair) of wavelengths to each ONU for communication, thus realizing virtual point-to-point transmission between ONU and OLT, but this transmission method makes point-to-multipoint broadcast signal transmission more difficult. Therefore, the invention plays a very important role in the wavelength division multiplexing passive opt...

AI Technical Summary

Problems solved by technology

[0003] In the conventional WDM-PON that realizes the broadcast function, a TDM-PON is generally superimposed on the WDM-PON to transmit the broadcast signal, or the broadcast information is loaded in the way of phase modulation, but the transmission of the former broadcast signal has to bear various The insertion loss of this device also needs to bear the power distribution loss, so its power is lower than that of the point-to-point signal, which affects the performance and transmission capacity of the network; and the latter needs to increase the phase modulation and demodulator in the system, which is Higher requirements are placed on network equipment and costs

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