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System and method for realizing multiple protection and extended functions of a three-dimensional passive optical access network

A passive optical access network and multiple protection technologies, applied in the field of optical communication, can solve problems such as limitations and loss of market competitiveness of operators

Inactive Publication Date: 2019-02-01
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current research on WDM-PON protection functions is limited to the part of the feeder fiber, mainly based on two-dimensional structures such as trees, stars, and rings.
However, there is little mention of protection schemes for distributed optical fibers in the last mile, and users will have to endure long-term network failures, which will gradually make operators lose market competitiveness

Method used

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  • System and method for realizing multiple protection and extended functions of a three-dimensional passive optical access network
  • System and method for realizing multiple protection and extended functions of a three-dimensional passive optical access network
  • System and method for realizing multiple protection and extended functions of a three-dimensional passive optical access network

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Embodiment 1

[0031] see Figure 1-Figure 3 , the three-dimensional passive optical access network realizes multiple protection and expansion functions. An optical link terminal OLT (1) is connected to a remote node RN (14) through two single-mode feeder optical fibers (11, 12), The remote node RN (14) is connected to N (N≥1) optical network units ONU (27) through a distributed optical fiber (26); it is characterized in that:

[0032] 1) if figure 1 As shown, the optical link terminal OLT (1) includes N optical transmitters (2), which are connected to 1 of a first three-port optical circulator (5) after passing through a first arrayed waveguide grating AWG (4). mouth. Port 2 of the three-port optical circulator (5) is connected to a first erbium-doped fiber amplifier EDFA1 (6). The right end of the EDFA1 (6) is connected to a first photodetector D 1 (7). Port 3 of the three-port optical circulator (5) is connected to a second arrayed waveguide grating AWG (8), and another N optical rec...

Embodiment 2

[0037] A system for realizing multiple protection and extended functions of a three-dimensional passive optical access network proposed by the present invention uses the system of Embodiment 1 to operate as follows:

[0038] In normal working mode, N wavelengths (3) are generated by the transmitter array (2) of the optical link terminal OLT (1), and after being combined by the first AWG (4), they pass through the three-port optical circulator (5) , the first erbium-doped fiber amplifier (6) and the first photodetector D 1 After (7), connect to a 1×2 optical switch (10). Such as figure 1 As shown, in the normal working mode, the optical switch (10) is placed at the upper port position. Downlink direction: the downlink optical signal after N channels are combined by the first AWG (4) into 1 channel passes through a single-mode feeder fiber (11) and the output port of the 2×1 optical coupler (13) and then reaches the remote node RN (14). After the downlink signal passes throu...

Embodiment 3

[0040] The system proposed by the present invention has a three-dimensional passive optical access network to realize multiple protection and expansion functions, and the method for realizing multiple protection and dynamic wavelength scheduling is as follows:

[0041] 1) Special protection method for feeder

[0042] refer to Figure 4 , when the feeder fiber (11) between the optical link terminal OLT (1) and the remote node RN (14) fails, all the downlink N optical wavelengths (3) cannot reach the remote node RN (14 ), the first photodetector D located in the optical link terminal OLT(1) 1 (7) The loss of the optical signal will be detected, and a control signaling will be sent to switch the 1×2 optical switch (10) between the OLT (1) and the RN (14) from the upper port to the lower port. At this time, all N channels of optical wavelengths are transmitted to the remote node RN (14) through the dedicated feeder protection optical fiber (12), thereby ensuring normal communica...

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Abstract

The invention relates to a system and method for realizing multiple protection and expansion functions for a three-dimensional passive optical access network. The system is that an optical link terminal OLT is connected to a remote node RN through two single mode fibers; the RN is connected to N optical network units ONUs, and the N ONUs are mutually connected into a three-dimensional structure, wherein the OLT mainly comprises N optimal transmitters, two arrayed waveguide gratings AWGs, one three-port optical circulator, one first erbium doped fiber amplifier, one optical detector and N optical receivers; and the RN comprises 7 AWGs, one 1x7 optical power divider, a second erbium doped fiber amplifier, N optical couplers and N three-port optical circulators. The system for realizing the multiple protection and expansion functions for the three-dimensional passive optical access network provided by the invention firstly realizes the extensible application of a three-dimensional structure in a WDM-PON by adopting an optical passive array which is formed by the AWGs and the optical couplers in the RN; and realizes the multiple protection of distributed optical fibers and wavelength reuse of the ONUs by using connecting optical fibers between optical switches and adjacent ONUs, so that the system achieves a balance between cost and performance.

Description

technical field [0001] The invention relates to the field of optical communication, in particular to a system and method for realizing multiple protection and extended functions of a three-dimensional passive optical access network. Background technique [0002] Based on multi-wavelength wavelength division multiplexing passive optical network WDM-PON technology, with its large bandwidth, high speed, multi-service and transparency to multi-protocol and many other advantages, it has broad application prospects in the field of optical access network. It is considered to be the best choice for the future evolution of FTTx. However, with the explosive growth of the number of access network users and their bandwidth requirements, the reliability and capacity of the network have become a bottleneck restricting the development of WDM-PON technology in the future. On the one hand, compared with traditional communication services, real-time services such as high-definition televisio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B10/032H04J14/02
CPCH04B10/032H04J14/0287
Inventor 苟凯俞甘朝钦华健邵奇张宇超邓诗琪
Owner SHANGHAI UNIV
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