CN103023559A - WDM-PON (wavelength-division-multiplexing passive optical network) system based on resource sharing protecting mechanism and method for protecting WDM-PON system based on resource sharing protecting mechanism - Google Patents
WDM-PON (wavelength-division-multiplexing passive optical network) system based on resource sharing protecting mechanism and method for protecting WDM-PON system based on resource sharing protecting mechanism Download PDFInfo
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Abstract
The invention discloses a WDM-PON (wavelength-division-multiplexing passive optical network) system based on the resource sharing protecting mechanism and a method for protecting the WDM-PON system based on the resource sharing protecting mechanism. The WDM-PON system based on the resource sharing protecting mechanism comprises an optical line terminal, a first feeder optical fiber, a second feeder optical fiber, a far-end node, a distributed optical fiber and a WDM-PON system, wherein the optical line terminal is connected with one ends of the first feeder optical fiber and the second feeder optical fiber, the other ends of the first feeder optical fiber and the second feeder optical fiber are connected with the far-end node which is connected with one end of the distributed optical fiber; the WDM-PON system is divided into a WDM-PON 1 and WDM-PON 2 and comprises 2N optical network units and 2N network control units, the optical network units of the WDM-PON 1 and the WDM-PON 2 are grouped pairwise and are mutually connected through two interconnection optical fibers, and the network control units of the WDM-PON 1 and the WDM-PON 2 are grouped pairwise and mutually connected. Faults of the optical fibers can be detected in time on one side of the optical line terminal, protection switching is realized by switching optical switches, and protection of all optical fibers among the optical line terminal and the optical network units.
Description
Technical field
The present invention relates to the system in optical communication technique field, specifically a kind of WDM-PON system and guard method based on the resource-sharing protection mechanism.
Background technology
Fast development along with information technology, high definition television (High Definition TV, HDTV), the continuing to bring out and increase of the emerging broadband services such as interactive entertainment, large file-sharing, video conference, the broadband of Access Network and the unified carrying of multi-service and transmittability are had higher requirement.EPON (Passive OpticalNetwork based on optical fiber, PON) has large bandwidth, advantage cheaply, FTTP (FTTP, Fiber To The Premise), Fiber To The Building (FTTB, Fiber To The Building) and fiber-to-the-subscriber (FTTH, Fiber To The Home), become the inexorable trend of access network technology development.
Traditional time division multiplexing EPON (Time Division Multiplexed Passive Optical Network, TDM-PON) technology is relatively ripe, and device cost is lower, has obtained large-area laying and widely application.Its shortcoming is that a plurality of users utilize different time slots to share the up-downgoing passage to carry out transfer of data, so each user's actual access bandwidth is restricted.Wave division multiplexing passive optical network (Wavelength Division MultiplexedPassive Optical Network, WDM-PON) be the specific wavelength of each user assignment, have be with roomy, to protocol transparent, the advantage such as confidentiality is high, service quality is good, be considered to the mainstream solution of following large capacity Access Network.Although WDM-PON is to optical line terminal (Optical Line Terminal, OLT) and optical network unit (OpticalNetwork Unit, ONU) light source at two ends, modulator etc. are had relatively high expectations, but along with the proposition of various low-cost multi wave length illuminating source schemes and colourlessization ONU technology, the practical cost of WDM-PON can be reduced to a great extent.
WDM-PON can provide large capacity, the access performance of high bandwidth, therefore the fault of any feeder line optical fiber or distribution type fiber-optic in the system, a large amount of loss of datas is brought in the capital, always bring loss to the user, therefore improve the reliability of WDM-PON, make it within the short as far as possible time, recover interrupted business and have very important significance.
At present mainly realize protection to optical fiber link by feeder line optical fiber and distribution type fiber-optic being carried out redundancy backup at WDM-PON.This scheme realizes simple, but backup optical fiber is in idle state fully when network works, and the utilization ratio of fiber resource is very low.Therefore, when recent study hotspot mainly concentrates on network link protected, reduce the quantity of slack, thus reduce whole system cost, improve the service efficiency of fiber resource.
Through existing literature search is found, Zhaoxin Wang, the people such as Xiaofeng Sun delivered the article that is entitled as " A Novel Centrally Controlled ProtectionScheme for Traffic Restoration in WDM Passive Optical Networks " at 2005 " PhotonicsTechnology Letters photon technology wall bulletin ".In this article, the author divides into groups the ONU that geographical position among the WDM-PON approaches in twos, and two ONU of each grouping couple together by two interconnected optical fiber.When distribution type fiber-optic corresponding to one of them ONU breaks down, carry out line switching by the optical switch of regulating the OLT end, the business of this ONU can utilize on the same group that the fiber resource of another ONU recovers.This scheme has been avoided the use of backup distribution type fiber-optic, saved fiber resource, its shortcoming is also fairly obvious simultaneously: feeder line optical fiber still needs backup in this scheme, when distribution type fiber-optic corresponding to some ONU breaks down, the line switching of OLT end can make the business of all ONU the interruption of certain hour occur, this be in the practical application do not wish to occur.
Find through retrieval again, Min Zhu, the people such as Wende Zhong delivered the article that is entitled as " A New Cross-protction Dual-WDM-PON Architecture withCarrier-reuse Colorless ONUs " 2012 " Optics Communication optical fiber communication ".The author proposes the WDM-PON that two address locations approach is joined together, and the ONU that will belong to different PON with interconnected optical fiber connects in twos, provides the protection link for the other side each other.Two WDM-PON adopt different wave bands, utilize the wavelength selection function of array waveguide grating (ArrayedWaveguide Grating, AWG) and red blue filter, can realize simultaneously the protection to feeder line optical fiber and distribution type fiber-optic.The advantage of this scheme is to have avoided the use of backup feeder line optical fiber and backup distribution type fiber-optic fully, thereby has dropped to the quantity of slack minimum.On the other hand, this paper utilizes the saturation gain effect of reflective semiconductor optical amplifier (ReflectiveSemiconductor OpticalAmplifier, RSOA) at the ONU end, downstream signal is wiped, then amplify and modulate upstream data, realized colourlessization of ONU.The shortcoming of this scheme is that the detection of optical fiber link fault and the switching of Protection path are all carried out at the ONU end, has increased the complexity of ONU.
Summary of the invention
The present invention is directed to above shortcomings in the prior art; a kind of WDM-PON system and guard method based on the resource-sharing protection mechanism is provided; the present invention is based on carrier wave and suppress modulation technique; utilize N laser to produce 2N optical sideband at optical line terminal; be assigned to respectively two Wavelength division multiplexing-passive network systems (WDM-PON1 and WDM-PON2), be used for downstream signal modulation and upward signal remodulates.The optical node of WDM-PON1 and WDM-PON2 (ONU) mutually for the other side provides the protection link, by in optical line terminal detection fiber fault and regulate optical switch, is realized the centralized control protection to optical fiber link in twos in groups.
The present invention is achieved by the following technical solutions.
A kind of WDM-PON system based on the resource-sharing protection mechanism, comprise optical line terminal, the first feeder line optical fiber, the second feeder line optical fiber, distant-end node, distribution type fiber-optic and Wavelength division multiplexing-passive network system, wherein, described optical line terminal respectively with the first feeder line optical fiber be connected an end of feeder line optical fiber and be connected, the first feeder line optical fiber be connected the other end of feeder line optical fiber and be connected with distant-end node and transmitting downlink data; Described distant-end node is connected with an end of distribution type fiber-optic, and downlink data transmission is arrived the optical network unit system; Described Wavelength division multiplexing-passive network system is divided into WDM-PON1 and WDM-PON2, comprises altogether 2N optical network unit and 2N network control unit, and wherein, described WDM-PON1 and WDM-PON2 include N optical network unit and N network control unit; Optical network unit among the described WDM-PON1 and the optical network unit among the WDM-PON2 are in twos in groups, and be connected by two interconnected optical fiber, be used for providing each other the share protect link, any optical network unit demodulation downlink data wherein, and downlink optical signal carried out remodulates, be transferred to distant-end node through the distribution type fiber-optic corresponding with it and carry out uplink; Network control unit among the described WDM-PON1 and the network control unit among the WDM-PON2 interconnect in twos in groups; N the optical network unit that the N that WDM-PON1 a comprises optical network unit and WDM-PON2 comprise consists of described optical network unit system; Described N is natural number.
Described distant-end node comprises: the 5th array waveguide grating and the 6th array waveguide grating, wherein, one end of described the 5th array waveguide grating is connected with the first feeder line optical fiber, and a plurality of delivery outlets of the other end of the 5th array waveguide grating are connected with each distribution type fiber-optic of WDM-PON1; One end of described the 6th array waveguide grating is connected with the second feeder line optical fiber, and a plurality of delivery outlets of the other end of the 6th array waveguide grating are connected with each distribution type fiber-optic of WDM-PON2; The downstream signal demultiplexing that described distant-end node comes the first feeder line optical fiber and the second feeder line Optical Fiber Transmission also is transferred to corresponding optical network unit, the optical multiplexed signal that simultaneously each optical network unit uplink is come with and carry out uplink by the first feeder line optical fiber and the second feeder line optical fiber.
Described optical line terminal comprises: shared light source, the first comb filter, the first array waveguide grating, the second array waveguide grating, the 3rd array waveguide grating, the 4th array waveguide grating, the first erbium-doped fiber amplifier, the second erbium-doped fiber amplifier, the first optical circulator and the second optical circulator, wherein, described shared light source produces 2N carrier wave and suppresses optical sideband, after the first comb filter, N road upper sideband offers WDM-PON1, be used for downstream signal modulation and up new remodulates, N road lower sideband offers WDM-PON2, is used for downstream signal modulation and up new remodulates; Described N road upper sideband through the first array waveguide grating demultiplexing after, enter respectively the network control unit among the WDM-PON1, described N road lower sideband through the second array waveguide grating demultiplexing after, enter respectively the network control unit among the WDM-PON2; Described arbitrary network control unit carries out Corticofugal Modulation of Somatosensory to the optical sideband that enters, and demodulation is monitored uplink optical signal simultaneously from the up remodulates signal of corresponding light network element; The 3rd array waveguide grating and the 4th array waveguide grating are respectively applied to downlink optical signal and demultiplexing the first feeder line optical fiber and the next up remodulates signal of the second feeder line Optical Fiber Transmission of multiplexing WDM-PON1 and WDM-PON2; After the downlink optical signal of WDM-PON1 amplifies through the first optical circulator and the first erbium-doped fiber amplifier, be input in the first feeder line optical fiber and transmit, the downlink optical signal of WDM-PON2 is input in the second feeder line optical fiber and transmits after amplifying through the second optical circulator and the second erbium-doped fiber amplifier.
Described shared light source comprises: N laser, the 7th array waveguide grating, Mach zehnder modulators, radio-frequency signal generator and the 3rd erbium-doped fiber amplifier, wherein, enter Mach zehnder modulators after the light that a described N laser sends is multiplexing through the 7th array waveguide grating and produce the Double Sideband Suppressed Carrier signal, described Mach zehnder modulators is biased in transmission zero, and by radio frequency signals drive; The delivery outlet of described Mach zehnder modulators connects the 3rd erbium-doped fiber amplifier and suppresses light signal to amplify carrier wave; The delivery outlet of described the 3rd erbium-doped fiber amplifier is connected with the first comb filter, for separating of upper sideband and the lower sideband of carrier wave Inhibitory signal.
Described arbitrary optical network unit comprises: the 3rd comb filter, 2 * 2 optical couplers, downlink receiver and reflective semiconductor optical amplifier, wherein, one side ports of described the 3rd comb filter distribution type fiber-optic corresponding with this optical network unit connects, an input port of 2 * 2 optical couplers in one of them port of described the 3rd comb filter opposite side and this optical network unit is connected, and an input port of 2 * 2 optical couplers in another port of described the 3rd comb filter opposite side and another optical network unit on the same group is connected; An input port of described 2 * 2 optical couplers, one side is connected with a port of the 3rd comb filter of this optical network unit, and another input port of described 2 * 2 optical couplers, one side is connected with a port of the 3rd comb filter of another optical network unit on the same group; Two ports of described 2 * 2 optical coupler opposite sides are connected with the reflective semiconductor laser with downlink receiver respectively, wherein, a part of downlink optical signal through 2 * 2 optical couplers enters downlink receiver demodulation downlink data, and another part light signal enters reflective semiconductor optical amplifier remodulates upstream data.
Described arbitrary network control unit comprises: intensity modulator, optical circulator, 1 * 2 optical coupler, uplink receiver, optical switch, monitor controller and the second comb filter, wherein, described intensity modulator is modulated at downstream signal on the optical sideband that enters this network control unit; Described optical circulator is transferred to downstream signal the first port of optical switch, simultaneously with the input port of uplink signal transmissions to 1 * 2 optical couplers; A delivery outlet of described 1 * 2 optical coupler links to each other with uplink receiver, is used for the demodulation upward signal, and its another delivery outlet is connected with monitor controller; Described monitor controller is monitored the corresponding link condition of this network control unit, and the control optical switch is protected and switched; The first port of described optical switch is connected with optical circulator, its second port is connected with a port of the second comb filter of this network control unit, a port of the second comb filter in its 3rd port and another network control unit on the same group is connected, and the opposite side single port of the described comb filter array waveguide grating corresponding with this network control unit connects.
The guard method of described WDM-PON system based on the resource-sharing protection mechanism may further comprise the steps:
When a feeder line optical fiber broke down, network control units all among the WDM-PON of fault all detected fault, and the optical switch of control network control unit changes connection status;
Step 4, downlink data arrives the optical network unit that fiber failure occurs by the link transmission of another optical network unit in sharing on the same group; Simultaneously, the up remodulates data of this optical network unit are also carried out demodulation by share protect link transmission corresponding network control unit in the optical line terminal; Because two optical network units in the same optical network unit group belong to different WDM-PON systems; the light carrier that is used for loading data is respectively Same Wavelength and suppresses the upper lower sideband that produces after the modulation through carrier wave; therefore one of them optical network unit protection is switched; can not affect the on the same group transfer of data of another optical network unit fully; thereby finish the recovery of data service, realize protection of resources.
Compared with the prior art, the invention has the advantages that:
1) by the sharing fiber link, two WDM-PON systems can be mutually for the other side provides protection, thereby has avoided the use of backup feeder line optical fiber and backup distribution type fiber-optic, has dropped to the quantity of slack minimum.
2) optical line terminal adopts carrier wave inhibition technology to reduce the quantity of laser for two WDM-PON provide shared light source, has improved the wavelength service efficiency.
3) detection and the protection of fiber failure are all carried out at optical line terminal, do not increased the operation complexity of optical network unit, adopt simultaneously colourlessization optical network unit technology, can effectively reduce the cost of optical network unit.
The present invention can switch optical line terminal protection, effectively fiber failure is recovered, and the quantity of slack is minimized; A cover light source is shared by two WDM-PON systems, and all optical network units all adopt colourlessization technology simultaneously, have further improved the utilance of wavelength resource, have reduced cost.
Description of drawings
Fig. 1 is structural representation of the present invention;
Fig. 2 is shared light-source structure schematic diagram;
Fig. 3 is network control unit structure and burst mode schematic diagram;
Fig. 4 is optical network unit structure and burst mode schematic diagram;
Wrap protection schematic diagram when Fig. 5 is the fiber failure generation.
Embodiment
The below elaborates to embodiments of the invention: the present embodiment is implemented under take technical solution of the present invention as prerequisite, provided detailed execution mode and concrete operating process, but protection scope of the present invention is not limited to following embodiment.
As shown in Figure 1, the present embodiment comprises: comprise optical line terminal, the first feeder line optical fiber, the second feeder line optical fiber, distant-end node, distribution type fiber-optic and Wavelength division multiplexing-passive network system, wherein, described optical line terminal respectively with the first feeder line optical fiber be connected an end of feeder line optical fiber and be connected, the first feeder line optical fiber be connected the other end of feeder line optical fiber and be connected with distant-end node and transmitting downlink data; Described distant-end node is connected with an end of distribution type fiber-optic, and downlink data transmission is arrived the optical network unit system; Described Wavelength division multiplexing-passive network system is divided into WDM-PON1 and WDM-PON2, comprise altogether 2N optical network unit and 2N network control unit, wherein, described WDM-PON1 and WDM-PON2 include N optical network unit and N network control unit, 1-1,1-2 ... 1-N optical network unit belongs to WDM-PON1,2-1,2-2 ... 2-N optical network unit belongs to WDM-PON2,1-1,1-2 ... 1-N network control unit belongs to WDM-PON1,2-1,2-2 ... 2-N network control unit belongs to WDM-PON2; Optical network unit among the described WDM-PON1 and the optical network unit among the WDM-PON2 are in twos in groups, and be connected by two interconnected optical fiber, be used for providing each other the share protect link, any optical network unit demodulation downlink data wherein, and downlink optical signal carried out remodulates, be transferred to distant-end node through the distribution type fiber-optic corresponding with it and carry out uplink; Network control unit among the described WDM-PON1 and the network control unit among the WDM-PON2 interconnect in twos in groups; N the optical network unit that the N that WDM-PON1 a comprises optical network unit and WDM-PON2 comprise consists of described optical network unit system; Described N is natural number.
Further, optical line terminal comprises: shared light source, a 2N network control unit, comb filter, the first array waveguide grating, the second array waveguide grating, the 3rd array waveguide grating, the 4th array waveguide grating, the first erbium-doped fiber amplifier, the second erbium-doped fiber amplifier, the first optical circulator and the second optical circulator.Wherein: shared light source produces 2N carrier wave and suppresses optical sideband, through after the comb filter, N road upper sideband offers WDM-PON1 and is used for downstream signal modulation and up new remodulates, and N road lower sideband offers WDM-PON2 and is used for downstream signal modulation and up new remodulates; N road upper sideband through the first array waveguide grating demultiplexing after, enter respectively network control unit 1-1,1-2 ... 1-N, N road lower sideband through the second array waveguide grating demultiplexing after, enter respectively network control unit 2-1,2-2 ... 2-N; Network control unit 1-1,1-2 ... 1-N belongs to WDM-PON1, network control unit 2-1,2-2 ... 2-N belongs to WDM-PON2, the all-network control unit carries out Corticofugal Modulation of Somatosensory to the optical sideband that enters, and demodulation is monitored uplink optical signal simultaneously from the up remodulates signal of corresponding light network element.Network control unit interconnects in twos in groups, when fiber failure occurs, protects switching, recovers interrupted business; The 3rd array waveguide grating and the 4th array waveguide grating are respectively applied to downlink optical signal and demultiplexing the first feeder line optical fiber and the next up remodulates signal of the second feeder line Optical Fiber Transmission of multiplexing WDM-PON1 and WDM-PON2; After the downlink optical signal of WDM-PON1 amplifies through the first circulator and the first erbium-doped fiber amplifier, be input in the first feeder line optical fiber and transmit, the downlink optical signal of WDM-PON2 is input in the second feeder line optical fiber and transmits after amplifying through the second circulator and the second erbium-doped fiber amplifier.
Further, distant-end node comprises: the 5th array waveguide grating and the 6th array waveguide grating, wherein an end of the 5th array waveguide grating is connected with the first feeder line optical fiber, a plurality of delivery outlets of the other end are connected with each distribution type fiber-optic of WDM-PON1, one end of the 6th array waveguide grating is connected with the second feeder line optical fiber, and a plurality of delivery outlets of the other end are connected with each distribution type fiber-optic of WDM-PON2; The downstream signal demultiplexing that distant-end node comes the feeder line Optical Fiber Transmission also is transferred to corresponding optical network unit, the optical multiplexed signal that simultaneously each optical network unit uplink is come with and carry out uplink by feeder line optical fiber.
Further, shared light source comprises: N laser, array waveguide grating, Mach zehnder modulators, radio-frequency signal generator, erbium-doped fiber amplifier.Wherein, enter Mach zehnder modulators after the light that N laser sends is multiplexing through array waveguide grating and produce a Double Sideband Suppressed Carrier signal, a Mach zehnder modulators is biased in transmission zero, and by radio frequency signals drive; The delivery outlet of Mach zehnder modulators connects erbium-doped fiber amplifier and suppresses light signal to amplify carrier wave; The delivery outlet of erbium-doped fiber amplifier is connected upper sideband and the lower sideband for separating of the carrier wave Inhibitory signal with comb filter.
Further, as shown in Figure 3, network control unit comprises: intensity modulator, optical circulator, 1 * 2 optical coupler, uplink receiver, optical switch, monitor controller and comb filter.Wherein, intensity modulator is modulated at downstream signal on the optical sideband that enters this network control unit; Optical circulator is transferred to downstream signal 1 port of optical switch, simultaneously with the input port of uplink signal transmissions to 1 * 2 optical couplers; A delivery outlet of 1 * 2 optical coupler links to each other with uplink receiver, is used for the demodulation upward signal, and another delivery outlet is connected with monitor controller; Monitor controller is monitored the corresponding link condition of this network control unit, and the control optical switch is protected and switched.Belong to the network control unit of different WDM-PON in twos in groups, select by the optical switch control link.1 port of optical switch is connected with optical circulator, and 2 ports are connected with a port of the comb filter of this network element, and a port of the comb filter in 3 ports and another network control unit on the same group is connected.The opposite side single port of the comb filter array waveguide grating corresponding with this network control unit connects.
Further, as shown in Figure 4, optical network unit comprises: comb filter, 2 * 2 optical couplers, downlink receiver and reflective semiconductor optical amplifier.Wherein, one side ports of comb filter is connected with distribution type fiber-optic, an input port of 2 * 2 optical couplers in port of opposite side and this optical network unit is connected, and an input port of 2 * 2 optical couplers in another port and another optical network unit on the same group is connected; An input port of 2 * 2 optical couplers, one side is connected with a port of the comb filter of this optical network unit, and another input port is connected with a port of the comb filter of another optical network unit on the same group; Two ports of 2 * 2 optical coupler opposite sides are connected with the reflective semiconductor laser with downlink receiver respectively, a part of downlink optical signal through 2 * 2 optical couplers enters downlink receiver demodulation downlink data, and another part light signal enters reflective semiconductor optical amplifier remodulates upstream data.
As shown in Figure 5, the system that utilizes the present embodiment to provide, its guard method may further comprise the steps:
When a feeder line optical fiber broke down, network control units all among the WDM-PON of fault all detected fault, and controlled its optical switch change connection status;
Step 4, downlink data arrives the optical network unit that fiber failure occurs by the link transmission of another optical network unit in sharing on the same group; Simultaneously, the up remodulates data of this optical network unit are also carried out demodulation by share protect link transmission corresponding network control unit in the optical line terminal, thereby are finished the recovery of data service, realize protection of resources.
The cardinal principle of the method is: because two optical network units in the same optical network unit group belong to different WDM-PON systems; the light carrier that is used for loading data is respectively Same Wavelength and suppresses the upper lower sideband that produces after the modulation through carrier wave; therefore one of them optical network unit protection is switched; can not affect the on the same group transfer of data of another optical network unit fully, thereby can realize protection of resources by Resources Sharing Mechanism.
The advantage of the present embodiment is:
1) by the sharing fiber link, two WDM-PON systems can be mutually for the other side provides protection, thereby has avoided the use of backup feeder line optical fiber and backup distribution type fiber-optic, has dropped to the quantity of slack minimum.
2) optical line terminal adopts carrier wave inhibition technology to reduce the quantity of laser for two WDM-PON provide shared light source, has improved the wavelength service efficiency.
3) detection and the protection of fiber failure are all carried out at optical line terminal, do not increased the operation complexity of optical network unit, adopt simultaneously colourlessization optical network unit technology, can effectively reduce the cost of optical network unit.
Above specific embodiments of the invention are described.It will be appreciated that, the present invention is not limited to above-mentioned specific implementations, and those skilled in the art can make various distortion or modification within the scope of the claims, and this does not affect flesh and blood of the present invention
Claims (7)
1. WDM-PON system based on the resource-sharing protection mechanism, it is characterized in that, comprise optical line terminal, the first feeder line optical fiber, the second feeder line optical fiber, distant-end node, distribution type fiber-optic and Wavelength division multiplexing-passive network system, wherein, described optical line terminal respectively with the first feeder line optical fiber be connected an end of feeder line optical fiber and be connected, the first feeder line optical fiber be connected the other end of feeder line optical fiber and be connected with distant-end node and transmitting downlink data; Described distant-end node is connected with an end of distribution type fiber-optic, and downlink data transmission is arrived the optical network unit system; Described Wavelength division multiplexing-passive network system is divided into WDM-PON1 and WDM-PON2, comprises altogether 2N optical network unit and 2N network control unit, and wherein, described WDM-PON1 and WDM-PON2 include N optical network unit and N network control unit; Optical network unit among the described WDM-PON1 and the optical network unit among the WDM-PON2 are in twos in groups, and be connected by two interconnected optical fiber, be used for providing each other the share protect link, any optical network unit demodulation downlink data wherein, and downlink optical signal carried out remodulates, be transferred to distant-end node through the distribution type fiber-optic corresponding with it and carry out uplink; Network control unit among the described WDM-PON1 and the network control unit among the WDM-PON2 interconnect in twos in groups; N the optical network unit that the N that WDM-PON1 a comprises optical network unit and WDM-PON2 comprise consists of described optical network unit system; Described N is natural number.
2. the WDM-PON system based on the resource-sharing protection mechanism according to claim 1, it is characterized in that, described distant-end node comprises: the 5th array waveguide grating and the 6th array waveguide grating, wherein, one end of described the 5th array waveguide grating is connected with the first feeder line optical fiber, and a plurality of delivery outlets of the other end of the 5th array waveguide grating are connected with each distribution type fiber-optic of WDM-PON1; One end of described the 6th array waveguide grating is connected with the second feeder line optical fiber, and a plurality of delivery outlets of the other end of the 6th array waveguide grating are connected with each distribution type fiber-optic of WDM-PON2; The downstream signal demultiplexing that described distant-end node comes the first feeder line optical fiber and the second feeder line Optical Fiber Transmission also is transferred to corresponding optical network unit, the optical multiplexed signal that simultaneously each optical network unit uplink is come with and carry out uplink by the first feeder line optical fiber and the second feeder line optical fiber.
3. the WDM-PON system based on the resource-sharing protection mechanism according to claim 1, it is characterized in that, described optical line terminal comprises: shared light source, the first comb filter, the first array waveguide grating, the second array waveguide grating, the 3rd array waveguide grating, the 4th array waveguide grating, the first erbium-doped fiber amplifier, the second erbium-doped fiber amplifier, the first optical circulator and the second optical circulator, wherein, described shared light source produces 2N carrier wave and suppresses optical sideband, after the first comb filter, N road upper sideband offers WDM-PON1, be used for downstream signal modulation and up new remodulates, N road lower sideband offers WDM-PON2, is used for downstream signal modulation and up new remodulates; Described N road upper sideband through the first array waveguide grating demultiplexing after, enter respectively the network control unit among the WDM-PON1, described N road lower sideband through the second array waveguide grating demultiplexing after, enter respectively the network control unit among the WDM-PON2; Described arbitrary network control unit carries out Corticofugal Modulation of Somatosensory to the optical sideband that enters, and demodulation is monitored uplink optical signal simultaneously from the up remodulates signal of corresponding light network element; The 3rd array waveguide grating and the 4th array waveguide grating are respectively applied to downlink optical signal and demultiplexing the first feeder line optical fiber and the next up remodulates signal of the second feeder line Optical Fiber Transmission of multiplexing WDM-PON1 and WDM-PON2; After the downlink optical signal of WDM-PON1 amplifies through the first optical circulator and the first erbium-doped fiber amplifier, be input in the first feeder line optical fiber and transmit, the downlink optical signal of WDM-PON2 is input in the second feeder line optical fiber and transmits after amplifying through the second optical circulator and the second erbium-doped fiber amplifier.
4. the WDM-PON system based on the resource-sharing protection mechanism according to claim 3, it is characterized in that, described shared light source comprises: N laser, the 7th array waveguide grating, Mach zehnder modulators, radio-frequency signal generator and the 3rd erbium-doped fiber amplifier, wherein, enter Mach zehnder modulators after the light that a described N laser sends is multiplexing through the 7th array waveguide grating and produce the Double Sideband Suppressed Carrier signal, described Mach zehnder modulators is biased in transmission zero, and by radio frequency signals drive; The delivery outlet of described Mach zehnder modulators connects the 3rd erbium-doped fiber amplifier and suppresses light signal to amplify carrier wave; The delivery outlet of described the 3rd erbium-doped fiber amplifier is connected with the first comb filter, for separating of upper sideband and the lower sideband of carrier wave Inhibitory signal.
5. the WDM-PON system based on the resource-sharing protection mechanism according to claim 1, it is characterized in that, described arbitrary optical network unit comprises: the 3rd comb filter, 2 * 2 optical couplers, downlink receiver and reflective semiconductor optical amplifier, wherein, one side ports of described the 3rd comb filter distribution type fiber-optic corresponding with this optical network unit connects, an input port of 2 * 2 optical couplers in one of them port of described the 3rd comb filter opposite side and this optical network unit is connected, and an input port of 2 * 2 optical couplers in another port of described the 3rd comb filter opposite side and another optical network unit on the same group is connected; An input port of described 2 * 2 optical couplers, one side is connected with a port of the 3rd comb filter of this optical network unit, and another input port of described 2 * 2 optical couplers, one side is connected with a port of the 3rd comb filter of another optical network unit on the same group; Two ports of described 2 * 2 optical coupler opposite sides are connected with the reflective semiconductor laser with downlink receiver respectively, wherein, a part of downlink optical signal through 2 * 2 optical couplers enters downlink receiver demodulation downlink data, and another part light signal enters reflective semiconductor optical amplifier remodulates upstream data.
6. the WDM-PON system based on the resource-sharing protection mechanism according to claim 1, it is characterized in that, described arbitrary network control unit comprises: intensity modulator, optical circulator, 1 * 2 optical coupler, uplink receiver, optical switch, monitor controller and the second comb filter, wherein, described intensity modulator is modulated at downstream signal on the optical sideband that enters this network control unit; Described optical circulator is transferred to downstream signal the first port of optical switch, simultaneously with the input port of uplink signal transmissions to 1 * 2 optical couplers; A delivery outlet of described 1 * 2 optical coupler links to each other with uplink receiver, is used for the demodulation upward signal, and its another delivery outlet is connected with monitor controller; Described monitor controller is monitored the corresponding link condition of this network control unit, and the control optical switch is protected and switched; The first port of described optical switch is connected with optical circulator, its second port is connected with a port of the second comb filter of this network control unit, a port of the second comb filter in its 3rd port and another network control unit on the same group is connected, and the opposite side single port of the described comb filter array waveguide grating corresponding with this network control unit connects.
7. the guard method of each described WDM-PON system based on the resource-sharing protection mechanism in a utilization such as the claim 1 to 6 is characterized in that, may further comprise the steps:
Step 1, network control unit carries out state-detection to its corresponding optical line terminal and to feeder line optical fiber;
Step 2, when the distribution type fiber-optic of an optical network unit connection broke down, the network control unit that optical line terminal is corresponding detected fault, and the optical switch of control network control unit changes connection status; Or
When a feeder line optical fiber broke down, network control units all among the WDM-PON of fault all detected fault, and the optical switch of control network control unit changes connection status;
Step 3, the connection status of optical switch connects the first port-the 3rd port connection that is converted to optical switch by the first port-second port of optical switch;
Step 4, downlink data arrives the optical network unit that fiber failure occurs by the link transmission of another optical network unit in sharing on the same group; Simultaneously, the up remodulates data of this optical network unit are also carried out demodulation by share protect link transmission corresponding network control unit in the optical line terminal, thereby are finished the recovery of data service, realize protection of resources.
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