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Large-scale optical access network system and method for realizing transmission and protection functions of broadcasting services in wavelength division multiplexing optical access network

A broadcasting service and access network technology, applied in the field of optical communication, can solve problems such as inability to directly realize broadcasting service transmission

Inactive Publication Date: 2014-12-24
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, due to the characteristics of virtual point-to-point transmission of WDM technology, it cannot directly realize effective broadcast service transmission

Method used

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  • Large-scale optical access network system and method for realizing transmission and protection functions of broadcasting services in wavelength division multiplexing optical access network
  • Large-scale optical access network system and method for realizing transmission and protection functions of broadcasting services in wavelength division multiplexing optical access network
  • Large-scale optical access network system and method for realizing transmission and protection functions of broadcasting services in wavelength division multiplexing optical access network

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] see figure 1 , this WDM optical access network is a large-scale optical access network system that realizes the transmission and protection functions of broadcasting services. The central office CO (1) connects a remote node RN through M+1 single-mode optical fibers (2), the remote node RN (2) is connected to M optical network unit groups (3) through distributed optical fibers, and each optical network unit group includes N optical network unit ONUs (4).

[0024] see figure 2 , the central office CO (1) includes a broadcast signal transmitter (8), M optical line terminals OLT (7), an M+1 M+1 optical switch (9) and an optional first erbium-doped fiber amplifier EDFA (10), wherein each optical line terminal OLT (7) contains N optical signal transmitters (11), N optical Signal receiver (12), first and second two 1*N arrayed waveguide gratings AWG (13, 17), an optical circulator (15), an optical signal monitor (14), a first optical branch device (16). In the OLT (7), ...

Embodiment 2

[0028] see figure 1 , figure 2 , image 3 The specific method of the system shown in the large-scale optical access network that realizes the transmission and protection functions of the broadcasting service of the system wavelength division multiplexing optical access network is: for the transmission of the broadcasting service, firstly, the The transmitter (8) uses a specific and exclusive wavelength for broadcast signal transmission, after the optical signal is amplified by a first erbium-doped fiber optical amplifier EDFA (10), it passes through an M+1 The M+1 optical switch (9) is sent into the shared optical fiber (6) and transmitted to the remote node RN (2). In the remote node RN (2), the broadcast signal in the shared optical fiber (6) first passes through a fourth erbium-doped fiber optical amplifier EDFA (28) for signal amplification and then passes through a third coarse wavelength division multiplexer (29 ) to send the broadcast optical signal with the above w...

Embodiment 3

[0030] see Figure 4 , Figure 5 , when any one of the M feeder fibers (5) fails, 1:M shared protection can be performed through the shared fiber (6). When a fault occurs, the optical signal monitor (14) located in the optical line terminal OLT (7) in the central office CO (1) detects the change of the upstream optical signal, and controls M+1 The optical switch (9) of M+1 puts the network into protection mode. The uplink and downlink signals originally in the faulty feeder fiber (5) pass through M+1 The switching of the optical switch (9) of M+1 is loaded onto the shared optical fiber (6) and transmitted together with the broadcast signal. At the same time, the optical signal monitor (19) in the REPEATER repeater (18) connected to the faulty feeder fiber (5) in the remote node RN (2) detects the change of the downlink optical signal, and controls 1 The light switch (20) of 2 makes it enter protection mode. In this way, the optical signal carrying the downlink informat...

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PUM

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Abstract

The invention relates to a large-scale optical access network system and transmission method for realizing transmission and protection functions of broadcasting services in a wavelength division multiplexing optical access network. According to the system, one center office (CO) is connected with a remote node (RN) through M+1 optical fibers to form a tree network and the RN is connected with optical network units (ONUs) through distributed optical fibers. Through the design of the CO end and the RN end, efficient transmission of broadcasting signals is realized; through the structural design of an RN end switch and ONU end switches, sheared protection of feeder line optical fibers is realized, and the system is balanced between cost and performance. According to the large-scale optical access network system and method, through selection of partial selectable optical devices, flexible selection of the transmission distance and the transmission scale can be realized, and the system can meet different network requirements.

Description

technical field [0001] The present invention relates to the field of optical communication, in particular to a large-scale optical access network system and method for realizing broadcast service transmission and protection functions through a wavelength division multiplexing optical access network (OAN). Background technique [0002] Wavelength division multiplexing (WDM) technology can upgrade the bandwidth without changing the physical infrastructure, greatly increase the transmission capacity of the network, and realize virtual point-to-point transmission. Users will not share information and have natural security. . Also because of the introduction of WDM technology, in the optical access network, the overall transmission capacity of the network is greatly improved compared with the traditional time division multiplexing technology (TDM), so people have higher and higher requirements for network reliability, and The ability to provide network fault self-healing and pro...

Claims

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Application Information

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IPC IPC(8): H04J14/02H04Q11/00H04B10/25
Inventor 冯晨甘朝钦高子越郭苏
Owner SHANGHAI UNIV
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