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Large-scale optical access network system and method for realizing transmission and protection functions of broadcasting services through 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: 2018-04-06
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 through wavelength division multiplexing optical access network
  • Large-scale optical access network system and method for realizing transmission and protection functions of broadcasting services through wavelength division multiplexing optical access network
  • Large-scale optical access network system and method for realizing transmission and protection functions of broadcasting services through 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 contains 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 An erbium-doped fiber amplifier EDFA (10), wherein each optical line terminal OLT (7) includes N optical signal transmitters (11), N optical signal receivers (12), first and second two 1*N arrayed waveguide grating AWG (13, 17), an optical circulator (15), an optical signal monitor (14), and a first optical splitter (16). In the OLT (7), N...

Embodiment 2

[0028] see figure 1 , figure 2 , image 3The system shown, the specific method of realizing the large-scale optical access network of the transmission and protection function of the system wavelength division multiplexing optical access network broadcasting service is: for the transmission of the broadcasting service, first in the CO (1) located in the central office The transmitter (8) uses a specific and exclusive wavelength for sending broadcast signals, and after the optical signal is amplified by a first erbium-doped fiber optical amplifier EDFA (10), it passes through an M+1×M+1 optical switch (9) and then sent to 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) ) sending the broadcast opti...

Embodiment 3

[0030] see Figure 4 , Figure 5 , when any one of the M feeder optical fibers (5) fails, 1:M shared protection can be performed through the shared optical 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 the optical switch (9) of M+1×M+1 to make The network goes into protected mode. The uplink and downlink signals originally in the faulty feeder optical fiber (5) are loaded onto the shared optical fiber (6) through switching of the M+1×M+1 optical switch (9) 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 far-end node RN (2) detects the change of the downlink optical signal, and controls the 1×2 optical switch ( 20) Make it into protected mode. In this way, in the downlink direction, the shar...

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Abstract

The invention relates to a large-scale optical access network system and a transmission method for realizing broadcast service transmission and protection functions through a wavelength division multiplexing optical access network. This system is: a central office CO is connected to a remote node RN through M+1 optical fibers to form a tree network, and the remote node RN is connected to the optical network unit ONU through distributed optical fibers. The design of the CO end and the RN end realizes the efficient transmission of broadcast signals; the structural design of the optical switch at the RN end and the ONU end optical switch realizes the shared protection of the feeder optical fiber, and the system achieves a balance between cost and performance. The invention can realize the flexible selection of transmission distance and scale through the selection of some optional optical devices, so that the system can adapt to different network requirements.

Description

technical field [0001] The 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 protection ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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