CN104320190A - Remote node device in wavelength division multiplexing passive optical network system - Google Patents
Remote node device in wavelength division multiplexing passive optical network system Download PDFInfo
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- CN104320190A CN104320190A CN201410163378.3A CN201410163378A CN104320190A CN 104320190 A CN104320190 A CN 104320190A CN 201410163378 A CN201410163378 A CN 201410163378A CN 104320190 A CN104320190 A CN 104320190A
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Abstract
The invention relates to a remote node device in a wavelength division multiplexing passive optical network system, belonging to the field of fiber optical communication technologies. The remote node device is applicable to the wavelength division multiplexing passive optical network system of an annular structure, which is formed by connecting an optical line terminal OLT and M remote nodes RN through optical fibers. The remote node device comprises a first optical coupler capable of dividing optical signals into two ways and an arrayed waveguide grating AWG connected to an optical network unit, wherein the input end of the first optical coupler is connected to an annular optical network through an optical switch, one output end of the first optical coupler is connected to the arrayed waveguide grating AWG, and the other output end of the first optical coupler is connected to the annular optical network through a first optical circulator. Through changes of the connection status of the optical switch, the optical fiber transmission direction of an annular feeder changes, a new path is searched for signal transmission timely, and the wavelength division multiplexing passive optical network system is protected, so that the reliability of transmission of the wavelength division multiplexing passive optical network is improved.
Description
Technical field
The present invention relates to the distant-end node device in a kind of WDM passive optical network system, belong to technical field of optical fiber communication.
Background technology
Wave division multiplexing passive optical network (WDM-PON) technology can realize bandwidth upgrading when not changing physical basis equipment by increasing the number of wavelengths transmitted in optical fiber, significantly promote the transmission capacity of network, realize virtual point-to-point transmission, and do not share information between each user, prevent information leakage, there is good fail safe, gather around in optical access network and have broad application prospects, be considered to the final selection of the following evolution of fiber to the home.The current research for WDM-PON is mainly based on the type of static Wavelength Assignment, wavelength is fixing to optical network unit ONU Ce Xia road in distant-end node RN, the time marquis that system user or user's request change, the dynamic dispatching of wavelength can not be realized in internal system, when user's variation or increase and decrease, make troubles to the scheduling of the wavelength of system.Simultaneously WDM-PON system architecture aspect is main or attach most importance to star, the basic topology such as tree-like, and optical-fiber network has high transmission rate, therefore when a failure occurs, the network system of above topology structure cannot find new transmission route and self-healing scheme for interrupted business within the short time, cause bust this, the reliability of influential system.
Summary of the invention
The object of this invention is to provide the distant-end node device in a kind of WDM passive optical network system, to change the low problem of the system reliability that causes to solve current WDM passive optical network system in ring feeder Optical Fiber Transmission direction because its distant-end node device cannot realize signal.
The present invention provides the distant-end node device in a kind of WDM passive optical network system for solving above technical problem, this distant-end node device is applicable to the WDM passive optical network system being formed circulus by optical line terminal OLT by Fiber connection M far-end node RN, described distant-end node device comprises the first optical coupler light signal being divided into two-way and the array waveguide grating AWG be connected with optical network unit ONU, the input of described first optical coupler is connected to optical fibre ring network by optical switch, an output of described first optical coupler is connected with array waveguide grating AWG, another one output is connected with optical fibre ring network by the first optical circulator.
Be provided with wavelength blocker between the output of described first optical coupler and the first port of the first optical circulator, belong to for filtering the signal that the optical network unit that is connected with this distant-end node RN receives.
Be provided with the second optical circulator between the first described optocoupler output and array waveguide grating AWG, the first port of described second optical circulator is connected with the output of the first optical coupler, and the second port is connected with array waveguide grating AWG.
Described distant-end node device is also provided with the 3rd optical circulator, and the second end of the 3rd optical circulator is connected with optical fibre ring network by optical switch, and the 3rd end is connected with the input of the first optical coupler.
Described distant-end node device also comprises the second optical coupler, and the output of this second optical coupler is connected with the first port of the 3rd optical circulator, and two inputs of the second optical coupler are connected with the 3rd port of the second optical circulator with the first optical circulator respectively.
Described optical switch is 2 × 2 optical switches, realizes the change of signal in ring wave division multiplexing passive optical network network system transfers direction by the change of this optical switch connection status.
The invention has the beneficial effects as follows: distant-end node device of the present invention is applicable to be formed by Fiber connection M far-end node RN by optical line terminal OLT the WDM passive optical network system of circulus, comprise the first optical coupler light signal being divided into two-way and the array waveguide grating AWG be connected with optical network unit, the input of described first optical coupler is connected to optical fibre ring network by optical switch, an output of the first optical coupler is connected with array waveguide grating AWG, another output is connected with optical fibre ring network by the first optical circulator, by the change of optical switch connection status, realize the change of signal in ring feeder Optical Fiber Transmission direction, in time for Signal transmissions finds new path, realize the protection to WDM passive optical network system, thus improve the reliability of Wave division multiplexing passive optical network transmission.
Accompanying drawing explanation
Fig. 1 is the structure chart of the distant-end node RN device in the embodiment of the present invention one;
Fig. 2 is the structure chart of the distant-end node RN device in the embodiment of the present invention two;
Fig. 3 is the structure chart of the distant-end node RN device in the embodiment of the present invention three;
Fig. 4 be distant-end node RN device in the embodiment of the present invention one and two the structure chart of WDM passive optical network system that is suitable for;
Fig. 5 be distant-end node RN device in the embodiment of the present invention three the structure chart of WDM passive optical network system that is suitable for;
Fig. 6 is the optical line terminal OLT structure chart of WDM passive optical network system in the embodiment of the present invention one.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is further described.
Embodiment one
Distant-end node RN device in the present embodiment is applicable to the WDM passive optical network system being formed circulus by optical line terminal OLT 20 by Fiber connection M far-end node RN, as shown in Figure 4, this passive optical network connects M distant-end node RN22,23,1,24 and 25 by optical line terminal OLT 20 by a monomode fiber and ring feeder optical fiber 21 and is formed, and each distant-end node RN respectively connects k optical network unit ONU by profile fiber.Optical line terminal OLT 20 as shown in Figure 6, the first array waveguide grating AWG126 and the second array waveguide grating AWG227 is connected to respectively by kM optical sender TX17 and optical receiver RX18, first, the output of the second two array waveguide grating AWG connects the first erbium-doped optical fiber amplifier EDFA 128 and the second erbium-doped optical fiber amplifier EDFA 229 respectively, first erbium-doped optical fiber amplifier EDFA 128 and the second erbium-doped optical fiber amplifier EDFA 229 are connected to the first port and the 3rd port of optical circulator 30 respectively, 3rd port of optical circulator 30 is connected to feeder fiber by 1 × 2 optical switch 31.
Distant-end node device in the present embodiment as shown in Figure 1, comprise 12 × 2 optical switch 2, 3 optical circulators 3, 8, 10, 2 optical couplers 4, 9 and 1 × k array waveguide grating AWG6, the ring feeder optical fiber of two port connection WDM passive optical network systems on the left of 2 × 2 optical switches 2, a port on the right side of 2 × 2 optical switches 2 is connected with the second port of the first optical circulator 3, 3rd port of the first optical circulator 3 is connected with the input of the first optical coupler 4, light signal is divided into two-way by the first optical coupler 4, one road is connected to the first port of the second optical circulator 8, second port of the second optical circulator 8 is connected with 1 × k array waveguide grating AWG6, array waveguide grating AWG6 connects k optical network unit ONU 11 by profile fiber 7, each optical network unit ONU comprises 1 optical coupler 12, 1 receiver RX13 and 1 reflective semiconductor optical amplifier RSOA14, in optical network unit ONU 11, signal is delivered in optical receiver RX13 and reflective semiconductor optical amplifier RSOA14 by optical coupler 12 by downstream signal respectively, 3rd port of the second optical circulator 8 is connected with an input of the second optical coupler 9, the output of the second optical coupler 9 in distant-end node RN1 is connected with the 3rd port of the first optical circulator 3, the first port that another road signal of first optical coupler 4 is connected to the 3rd optical circulator 10 is connected, second port of the 3rd optical circulator 10 is connected with another port on the right side of 2 × 2 optical switches 2, and the 3rd port of the 3rd optical circulator 10 is connected with the second optical coupler 9.
The working method of the distant-end node device in the WDM passive optical network system in the present embodiment is as follows, when the ring feeder optical fiber be connected with this distant-end node RNm1 device is normal, 2 × 2 optical switches 2 will be placed in parallel connection status, the upper port of downstream signal on the left of 2 × 2 optical switches 2 enters, after the first optical circulator 3, two parts are divided into by power by the first optical coupler 4, here this two parts of signals is called signal X and signal Y, signal X is after the second optical circulator 8, be that parameter carries out shunt by array waveguide grating AWG6 with wavelength, signal along separate routes exports from corresponding port, corresponding light network element ONU11 is entered through profile fiber 7, optical coupler 12 in optical network unit ONU 11 is directly received a part of signal being sent into optical receiver RX13 after downstream signal partial wave by power, another part light signal is admitted to reflective semiconductor optical amplifier RSOA14, downstream signal is wiped free of remodulates Hou Yanyuan road again and returns in distant-end node RN1 in reflective semiconductor optical amplifier RSOA14, and successively by the second optical circulator 8, second optical coupler 9, first optical circulator 3, get back to ring feeder optical fiber after 2 × 2 optical switches 2 and carry out uplink.After the 3rd optical circulator 10,2 × 2 optical switch 2, get back to ring feeder Optical fiber relay continue downlink transfer after first optical coupler 4 of signal Y distally node RN 1 exports.When rupturing appears in the ring feeder optical fiber be connected with this distant-end node RN device; 2 × 2 optical switches 2 in this distant-end node device RN will be placed in cross-connection state; the lower port of downstream signal on the left of 2 × 2 optical switches 2 enters; make signal in ring feeder optical fiber crossing defeated direction change; in time for Signal transmissions finds new path, realize the protection to WDM passive optical network system.
Embodiment two
Distant-end node RN device in the present embodiment improves further on the basis of embodiment one, as shown in Figure 2, wavelength blocker WB5 is provided with between the output and the first port of the first optical circulator of the first optical coupler, the signal that the optical network unit that is connected with this distant-end node RN receives is belonged to for filtering, other structure is the same with embodiment one, here no longer repeated description.
Downstream signal enters from 2 × 2 optical switches 2, after the first optical circulator 3, two parts are divided into by power by the first optical coupler 4, here this two parts of signals is called signal X and signal Y, signal X is after the second optical circulator 8, be that parameter carries out shunt by array waveguide grating AWG6 with wavelength, signal along separate routes exports from corresponding port, corresponding light network element ONU11 is entered through profile fiber 7, optical coupler 12 in optical network unit ONU 11 is directly received a part of signal being sent into optical receiver RX13 after downstream signal partial wave by power, another part light signal is admitted to reflective semiconductor optical amplifier RSOA14, downstream signal is wiped free of remodulates Hou Yanyuan road again and returns in distant-end node RN1 in reflective semiconductor optical amplifier RSOA14, and successively by the second optical circulator 8, second optical coupler 9, first optical circulator 3, get back to ring feeder optical fiber after 2 × 2 optical switches 2 and carry out uplink.First optical coupler 4 of signal Y distally node RN 1 export laggard enter wavelength blocker WB5, after belonging to the downstream signal that the optical network unit ONU 11 that is connected with this distant-end node RN receives in wavelength blocker WB5 filtered signal Y, after the 3rd optical circulator 10,2 × 2 optical switch 2, get back to ring feeder Optical fiber relay continue downlink transfer.
Embodiment three
In the present embodiment, distant-end node device is applicable to the WDM passive optical network system being formed circulus by optical line terminal OLT by two Fiber connection M far-end node RN, as shown in Figure 5, this passive optical network is connected M distant-end node RN22,23,1,24 and 25 by two monomode fibers and ring feeder optical fiber 19 with 21 by optical line terminal OLT 20 and is formed, and each far-end node RN respectively connects k optical network unit ONU by profile fiber.
Distant-end node device in the present embodiment as shown in Figure 3, the distinctive points of the device in this device and embodiment two is, this device is applicable to the WDM passive optical network system that two optical fiber connect, on the basis of embodiment two, by respectively setting up 1 × 2 optical switch 15 and 16 between the two ends on the left of 2 × 2 optical switches 2 and ring feeder optical fiber, on the left of first 1 × 2 optical switch 15, two ports connect outside and the inner fibers of ring-type feeder fiber respectively, and right side port connects port above 2 × 2 optical switch 2 left sides; On the left of second 1 × 2 optical switch 16, two ports connect the inner side and outer side optical fiber of ring-type feeder fiber respectively, and right side port connects port below 2 × 2 optical switch 2 left sides.Other structure of this device and the same in embodiment two, here no longer repeated description.
The working method of the distant-end node RNm device in the WDM passive optical network system in the present embodiment is as follows, when the ring feeder optical fiber 19 and 21 be connected with this distant-end node RNm device is all normal, 2 × 2 optical switches 2 will be placed in parallel connection status, upper port after downstream signal arrives on the left of the one 1 × 2 optical switch 15 enters, downstream signal is successively by after 2 × 2 optical switches 2 and the first optical circulator 3, two parts are divided into by power by the first optical coupler 4, here this two parts of signals is called signal X and signal Y, signal X is after the second optical circulator 8, be that parameter carries out shunt by array waveguide grating AWG6 with wavelength, signal along separate routes exports from corresponding port, corresponding light network element ONU11 is entered through profile fiber 7, optical coupler 12 in optical network unit ONU 11 is directly received a part of signal being sent into optical receiver RX13 after downstream signal partial wave by power, another part light signal is admitted to reflective semiconductor optical amplifier RSOA14, downstream signal is wiped free of remodulates Hou Yanyuan road again and returns in distant-end node RN1 in reflective semiconductor optical amplifier RSOA14, and successively by the second optical circulator 8, second optical coupler 9, first optical circulator 3, get back to ring feeder optical fiber after 2 × 2 optical switches and carry out uplink.First optical coupler 4 of signal Y distally node RN 1 export laggard enter wavelength blocker WB5, after belonging to the downstream signal that the optical network unit ONU 11 that is connected with this distant-end node RN receives in wavelength blocker WB5 filtered signal Y, after the 3rd optical circulator 10,2 × 2 optical switch 2, get back to ring feeder Optical fiber relay continue downlink transfer.
When in the ring feeder optical fiber be connected with this distant-end node device, rupturing appears in the feeder fiber 21 of side, transmission between this distant-end node device (here for distant-end node RN122) and optical line terminal OLT needs to be completed by inner side feeder fiber 19 in ring feeder optical fiber, the one 1 × 2 optical switch 15 now in distant-end node RN122 pushes below port, signal transmits along inner annular feeder fiber 19, lower port on the left of the one 1 × 2 optical switch 15 enters distant-end node RN, distant-end node RN to the processing procedure of signal with the same under normal circumstances, here no longer repeat specification.All there is fracture in the feeder fiber 21 and 19 when both sides in ring feeder optical fiber, 1 × 2 optical switch 31 now in optical line terminal OLT 20 is as lower port seat, all distant-end node RN22, 23, 1, 24, 2 × 2 optical switches 2 in 25 are placed in cross-connection state, the lower port of downstream signal on the left of 2 × 2 optical switches 2 enters, all the other transmitting procedures do not change, downstream signal is counterclockwise transmission, upward signal is clockwise direction transmission, by the change of 2 × 2 optical switch 2 connection status, realize the change in ring feeder Optical Fiber Transmission direction, in time for Signal transmissions finds new path, realize the protection to WDM passive optical network system.
Claims (6)
1. the distant-end node device in a WDM passive optical network system, it is characterized in that, this distant-end node device is applicable to the WDM passive optical network system being formed circulus by optical line terminal OLT by Fiber connection M far-end node RN, described distant-end node device comprises the first optical coupler light signal being divided into two-way and the array waveguide grating AWG be connected with optical network unit ONU, the input of described first optical coupler is connected to optical fibre ring network by optical switch, an output of described first optical coupler is connected with array waveguide grating AWG, another one output is connected with optical fibre ring network by the first optical circulator.
2. the distant-end node device in WDM passive optical network system according to claim 1, it is characterized in that, be provided with wavelength blocker between the output of described first optical coupler and the first port of the first optical circulator, belong to for filtering the signal that the optical network unit that is connected with this distant-end node RN receives.
3. the distant-end node device in WDM passive optical network system according to claim 2, it is characterized in that, the second optical circulator is provided with between the first described optocoupler output and array waveguide grating AWG, first port of described second optical circulator is connected with the output of the first optical coupler, and the second port is connected with array waveguide grating AWG.
4. the distant-end node device in WDM passive optical network system according to claim 3, it is characterized in that, described distant-end node device is also provided with the 3rd optical circulator, second end of the 3rd optical circulator is connected with optical fibre ring network by optical switch, and the 3rd end is connected with the input of the first optical coupler.
5. the distant-end node device in WDM passive optical network system according to claim 4, it is characterized in that, described distant-end node device also comprises the second optical coupler, the output of this second optical coupler is connected with the first port of the 3rd optical circulator, and two inputs of the second optical coupler are connected with the 3rd port of the second optical circulator with the first optical circulator respectively.
6. the distant-end node device in the WDM passive optical network system according to any one of claim 1-5, it is characterized in that, described optical switch is 2 × 2 optical switches, realizes the change of signal in ring wave division multiplexing passive optical network network system transfers direction by the change of this optical switch connection status.
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| CN111371506A (en) * | 2020-06-01 | 2020-07-03 | 网络通信与安全紫金山实验室 | Optical-generation optical carrier terahertz passive optical network system and transmission method |
| CN114173225A (en) * | 2021-11-09 | 2022-03-11 | 武汉邮电科学研究院有限公司 | Novel passive optical network architecture based on discrete EDFA optical amplifier |
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