System and method for leading wavelength division multiplexing passive optical network to realize broadcast function with self-healing function

Abstract

The invention relates to a system and a method for leading a wavelength division multiplexing passive optical network to realize the broadcast function with the self-healing function. The system adopts 1 optical line terminal OLT which is connected with a remote node RN through two single-mode optical fibers, and the remote node RN is connected with N-1 optical network units ONU, wherein the remote node RN mainly consists of 2 optical fiber Bragg gratings FBG, two 1 multiplied by (N-1) star couplers and 1 N multiplied by N AWG; broadcast signals sharing wavelength are reflected back by the optical fiber Bragg gratings FBG, divided by the 1 multiplied by (N-1) star couplers and then sent to N-1 input ports of an arrayed waveguide grating AWG; the transmission of the broadcast signals and point-to-point signals can be realized through the properties of the arrayed waveguide grating AWG; symmetric structures are adopted at two ends of the N multiplied N AWG for realizing the self-healing function of the system; and the transmission of the point-to-point uplink signals in the system is realized by utilizing the remodulation technology of a reflective semiconductor optical amplifier RSOA. The scheme can realize the transmission of the broadcast signals by only changing the structure of the system, and further balance the cost and the performances of the system.

Description

technical field [0001] The invention relates to the field of optical communication, in particular to a wavelength division multiplexing passive optical network (WDM-PON) with a self-healing function and a system and method for realizing broadcasting functions. Background technique [0002] With the rapid development of the information society, the demand for broadband video-on-demand, multimedia and other services continues to grow, especially the rapid development of the Internet, which puts forward higher requirements for data transmission. With the development of DWDM technology, the number of multiplexed channels is increasing, and the carrying capacity and transmission rate of the optical transport network are rapidly expanding. In particular, the development of optical fiber technology has made the link transmission rate reach several 10Gbps. In this ultra-high-speed, ultra-large-capacity optical transport network, when a network failure occurs, the damage of a link wi...

AI Technical Summary

Problems solved by technology

[0004] 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; while 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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