CN103916206A - Double-WDM-PON network architecture with mutual protection mechanism and method thereof - Google Patents
Double-WDM-PON network architecture with mutual protection mechanism and method thereof Download PDFInfo
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Abstract
The invention provides a double-WDM-PON network architecture with a mutual protection mechanism. The system is composed of two sub PONs, optical network units in the two sub PONs are grouped in a pairwise mode, and the optical network units are connected through an interconnection optical fiber. The invention further provides a corresponding protection method. Through the wide reflective spectrum characteristic of a chirped grating and the circulation routing characteristic of an AWG, optical fiber faults can be detected in time on one side of an optical line terminal, optical switches are switched so that protection switching can be achieved, and all feeder optical fibers and distributed optical fibers between the optical line terminal and the optical network units can be protected; a colorless optical network unit technology is adopted in each WDM-PON, and thus the cost of the optical network units can be effectively lowered; through a sharing optical fiber link, two WDM-PON systems can provide protection links for each other, hence, application of backup feeder optical fibers and backup distributed optical fibers is avoided, and the number of redundancy optical fibers is minimized.
Description
Technical field
The present invention relates to the system in optical communication technique field, particularly, relate to a kind of two WDM-PON network architecture and guard method with mutual protection mechanism.
Background technology
Along with the fast development of information technology, the rapid growth of the novel band width service such as HDTV (High-Definition Television), interactive entertainment, video conference, makes the future development of optical fiber access technology to high bandwidth, large capacity, high reliability and high quality-of-service.EPON based on optical fiber has large bandwidth, advantage cheaply, and FTTP, Fiber To The Building and Fiber to the home, become the inexorable trend of Access Network development.WDM-PON technology is 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.And along with the proposition of various low cost multi wave length illuminating source schemes and decolorizable optical network unit technology, the practical cost of WDM-PON can be reduced to a great extent.
The class of business of carrying along with Access Network and the increase of bandwidth; the access of especially possible speech business; reliability and the survivability of people to broadband networks requires also more and more higher; concrete show the raising that network survivability is required, require network in the time breaking down, to there is redundancy protecting and fast restoration capabilities.WDM-PON system is being carried vast capacity information; the fault of any feeder line optical fiber or distribution type fiber-optic, all can bring a large amount of loss of datas, will bring huge economic loss; society is caused and had a strong impact on, therefore the protection of WDM-PON system is seemed to extremely important.
In the prior art, the protection of WDM-PON mainly by being carried out to redundancy backup, feeder line optical fiber and distribution type fiber-optic is realized.This scheme realizes simple, but backup optical fiber in the time that network is normally worked completely in idle state, cause the utilization ratio of fiber resource very low.And the cost price of this double copies is very large, consider the sensitivity of Access Network for expense, how to provide cost-effectively the protection of optical fiber and optical network unit to become extremely important.Therefore, study hotspot in recent years mainly concentrates on when network link is protected, reduces the quantity of slack, thereby reduces the cost of whole system, improves the service efficiency of fiber resource.
By prior art is retrieved and is found, the people such as Zhaoxin Wang were published in 2005 in the article " A Novel Centrally Controlled Protection Scheme for Traffic Restoration in WDM Passive Optical Networks " on " Photonics Technology Letters ", propose ONU close geographical position in WDM-PON to divide into groups between two, couple together by interconnection fabric, in the time that a distribution type fiber-optic corresponding to ONU breaks down, can utilize the fiber resource of another ONU on the same group to reply.Although this scheme has been avoided the use of backup distribution type fiber-optic, weak point is still to need to back up feeder line optical fiber.
Find through retrieval again; the people such as Min Zhu were published in 2012 in the article " A New-protection Dual-WDM-PON Architecture with Carrier-reuse Colorless ONUs " of " Optics Communication "; also proposed two close WDM-PON in geographical position to join together; by interconnection fabric, ONU is connected between two, each other for the other side provides protection link.In this scheme, avoid the use of backup feeder line optical fiber and backup distribution type fiber-optic completely, the quantity of slack has been dropped to minimum.But the shortcoming of this scheme is the detection of optical fiber link fault and the switching of Protection path all carries out at ONU end, has increased the complexity of ONU.
Summary of the invention
For defect of the prior art, the object of this invention is to provide a kind of two WDM-PON network architecture and guard method with mutual protection mechanism.
The present invention is based on the wide Reflective Spectrum Characteristics of chirp grating optical fiber and the circulation routing characteristic of AWG; two WDM PON1 and WDM PON2 that operate in the different wavestrips of C-band are joined together; the optical network unit that belongs to different WDM PON is connected between two by interconnection fabric; each other for the other side provides protection link; by in optical line terminal detection fiber fault and regulate optical switch, realize the centralized control protection to optical fiber link.
According to a kind of two WDM-PON network architecture with mutual protection mechanism provided by the invention, comprising: the sub-passive optical-fiber network PON2 of the sub-passive optical-fiber network PON1 of transmission C-band red tape wavelength signals, transmission C-band blue zone wavelength signals;
Sub-passive optical-fiber network PON1, comprising: optical line terminal A, the first array waveguide grating, the first feeder line optical fiber, distant-end node A, distribution type fiber-optic A and optical network unit A;
Sub-passive optical-fiber network PON2, comprising: optical line terminal B, the second array waveguide grating, the second feeder line optical fiber, distant-end node B, distribution type fiber-optic B and optical network unit B;
Optical line terminal A, optical line terminal B include N optical transceiver, and optical transceiver is connected with one end of the first array waveguide grating, one end of the second array waveguide grating respectively;
The other end of the first array waveguide grating is connected to one end of distant-end node A by the first feeder line optical fiber, distant-end node A is mainly made up of the 3rd array waveguide grating;
The other end of the second array waveguide grating is connected to one end of distant-end node B by the second feeder line optical fiber, distant-end node B is mainly made up of the 4th array waveguide grating;
The other end of distant-end node A transmits data to N optical network unit A by distribution type fiber-optic A;
The other end of distant-end node B transmits data to N optical network unit B by distribution type fiber-optic B;
Described N optical network unit A and N optical network unit B between two in groups, and are connected by an interconnection fabric, for share protect link is provided each other;
The first array waveguide grating, the second array waveguide grating, the 3rd array waveguide grating, the 4th array waveguide grating, all have identical free spectral range FSR.
Preferably, described optical line terminal A and optical line terminal B include: Coarse Wave Division Multiplexer, Erbium-Doped Fiber Amplifier;
Optical line terminal A is all connected with the first array waveguide grating and the second array waveguide grating respectively by Coarse Wave Division Multiplexer with the optical transceiver in optical line terminal B;
Coarse Wave Division Multiplexer is for separating of being operated in C-band red tape wavelength signals and the blue zone wavelength signals in sub-passive optical-fiber network PON1 and sub-passive optical-fiber network PON2 with coupling;
The first array waveguide grating, the second array waveguide grating are all multiplexing for downstream signal that optical transceiver is sent and be transferred to the first feeder line optical fiber, the second feeder line optical fiber by Erbium-Doped Fiber Amplifier respectively, and the light signal demultiplexing respectively the first feeder line optical fiber, the second feeder line uplink optical fiber transmission being come be transferred to optical transceiver by Coarse Wave Division Multiplexer.
Preferably, optical network unit A comprises: Optical Receivers A, reflection type optical amplifier A, 2 × 2 coupler A, the first optical circulator, the second optical circulator, the first chirped fiber grating, the second chirped fiber grating;
Optical network unit B comprises: Optical Receivers B, reflection type optical amplifier B, 2 × 2 coupler B, the 3rd optical circulator, the 4th optical circulator, the 3rd chirped fiber grating, the 4th chirped fiber grating;
The descending luminous power receiving is divided into two parts by 2 × 2 coupler A: a part is injected descending Optical Receivers A, for downlink data receiving; Another part luminous power is injected into carries out remodulates in the reflection type optical amplifier A of gain saturation state and signal amplifies, and realizes uplink;
The descending luminous power receiving is divided into two parts by 2 × 2 coupler B: a part is injected descending Optical Receivers B, for downlink data receiving; Another part luminous power is injected into carries out remodulates in the reflection type optical amplifier B of gain saturation state and signal amplifies, and realizes uplink;
The first chirped fiber grating, the second chirped fiber grating, the 3rd chirped fiber grating, the 4th chirped fiber grating all have the characteristic of wide reflectance spectrum, realize the function of choosing self WDM-PON work wavestrip; Wherein, the chirped fiber grating reflectance spectrum of the first chirped fiber grating, the second chirped fiber grating is C-band red tape, and the chirped fiber grating reflectance spectrum of the 3rd chirped fiber grating, the 4th chirped fiber grating is C-band blue zone;
(A) when group passive optical-fiber network PON1, the equal fault-free of sub-passive optical-fiber network PON2:
When descending light signal arrives after optical network unit A, through the first optical circulator 1 port, the first chirp grating optical fiber, the first optical circulator 2 ports, 2 × 2 coupler A, enter descending Optical Receivers A from 2 × 2 coupler A light signal part out, another part enters in reflection type optical amplifier A for up wavelength remodulates successively; Light signal after reflection type optical amplifier A remodulates, successively through 2 × 2 coupler A, the first optical circulator 3 ports, the second chirp grating optical fiber, the first optical circulator 4 ports, the first optical circulator 1 port, is sent to distant-end node A place through distribution type fiber-optic A afterwards and does uplink;
Descending light signal arrives after optical network unit B, through the 3rd optical circulator 1 port, the 3rd chirp grating optical fiber, the 3rd optical circulator 2 ports, 2 × 2 coupler B, enter descending Optical Receivers B from 2 × 2 coupler B light signal part out, another part enters in reflection type optical amplifier B for up wavelength remodulates successively; Light signal after reflection type optical amplifier B remodulates, successively through 2 × 2 coupler B, the 3rd optical circulator 3 ports, the 4th chirp grating optical fiber, the 3rd optical circulator 4 ports, the 3rd optical circulator 1 port, is sent to distant-end node B place through distribution type fiber-optic B afterwards and does uplink;
(B) when the first feeder line optical fiber of group passive optical-fiber network PON1 or distribution type fiber-optic A break down:
The downlink optical signal of sub-passive optical-fiber network PON1 enters the second array waveguide grating through Coarse Wave Division Multiplexer, due to the circulation routing characteristic of the second array waveguide grating, this light signal will be by the second array waveguide grating, and after the second feeder line optical fiber, the 4th array waveguide grating, distribution type fiber-optic B, arrive successively the optical network unit B in the sub-passive optical-fiber network PON2 of protection group each other with the optical network unit A of sub-passive optical-fiber network PON1;
When descending light signal arrives after optical network unit B, downlink optical signal is successively through the 3rd optical circulator 1 port, the 3rd chirp grating, the 4th optical circulator 2 ports, the 4th optical circulator 3 ports, and light signal is afterwards sent to the optical network unit A end of the sub-passive optical-fiber network PON1 breaking down through interconnection fabric, in sub-passive optical-fiber network PON1, light signal is successively through the second optical circulator 3 ports, the second chirp grating optical fiber, the second optical circulator 4 ports, 2 × 2 coupler A, enter descending Optical Receivers A from 2 × 2 coupler A light signal part out, another part enters in reflection type optical amplifier A for up wavelength remodulates, light signal after reflection type optical amplifier A remodulates is successively through 2 × 2 coupler A, the second optical circulator 1 port, the first chirp grating optical fiber, the second optical circulator 2 ports, be sent to the optical network unit B of sub-passive optical-fiber network PON2 through interconnection fabric from the second optical circulator 3 ports light signal out, and successively through the 4th optical circulator 3 ports, the 4th chirp grating optical fiber, the 3rd optical circulator 4 ports, from the 3rd optical circulator 1 port uplink optical signal process distribution type fiber-optic B out, the 4th array waveguide grating, the second feeder line optical fiber, the second array waveguide grating and Coarse Wave Division Multiplexer, in the final optical transceiver that arrives sub-passive optical-fiber network PON1, thereby complete the recovery of data service, realize protection of resources.
Preferably, optical transceiver comprises: optical transmission module, Optical Receivers C, the 5th optical circulator, 1 × 2 optical switch, network control unit MCC, 10:90 coupler;
The 5th optical circulator is for separating of uplink and downlink signal; The 5th optical circulator 1 port connects optical transmission module, and the 5th optical circulator 2 ports connect the first port of 1 × 2 optical switch, and the 5th optical circulator 3 ports connect Optical Receivers C;
The first port of 1 × 2 optical switch connects the second port or the 3rd port of 1 × 2 optical switch under the control of network control unit MCC;
Network control unit MCC comprises a photo-detector PD and a control circuit; 10:90 coupler is isolated 10% up luminous power, enters the photo-detector PD in network control unit MCC, and the control circuit in network control unit MCC is adjusted the connected state of 1 × 2 optical switch according to the testing result of photo-detector PD; When photo-detector, PD can't detect light signal, and network control unit MCC just produces a signal of telecommunication and be used for switching the connected state of 1 × 2 optical switch, makes 1 × 2 optical switch connect the second port translation from the first port and connects the 3rd port to the first port.
According to a kind of guard method that utilizes above-mentioned two WDM-PON network architecture with mutual protection mechanism provided by the invention, comprise the steps:
Step 1, the network control unit MCC in optical transceiver carries out state-detection to its corresponding feeder line optical fiber and distribution type fiber-optic; Wherein, corresponding the first feeder line optical fiber of network control unit MCC and distribution type fiber-optic A in optical line terminal A, corresponding the second feeder line optical fiber of network control unit MCC and distribution type fiber-optic B in optical line terminal B;
Step 2, in the time that a distribution type fiber-optic in the distribution type fiber-optic B that distribution type fiber-optic A, optical network unit B that optical network unit A connects connect breaks down, corresponding network control unit MCC detects fault, and control 1 × 2 optical switch change connection status in network control unit MCC, connect the second port status from the first port and be converted to the first port connection the 3rd port; Or
In the time that a feeder line optical fiber in the second feeder line optical fiber of the first feeder line optical fiber of the sub-passive optical-fiber network PON1 of correspondence, corresponding sub-passive optical-fiber network PON2 breaks down, in the corresponding sub-passive optical-fiber network breaking down, all network control unit MCC all detect fault, and the connection status of controlling 1 × 2 all optical switches is that the first port connects the 3rd port;
Step 3, the sub-passive optical-fiber network downlink data at the place of breaking down is realized transfer of data by the optical fiber link of sharing another sub-passive optical-fiber network.
Preferably, when the optical fiber link of group passive optical-fiber network PON1 breaks down, the downlink optical signal of sub-passive optical-fiber network PON1 enters the second array waveguide grating through Coarse Wave Division Multiplexer, due to the circulation routing characteristic of the second array waveguide grating, this light signal will be by the second array waveguide grating, and after the second feeder line optical fiber, the 4th array waveguide grating, distribution type fiber-optic B, arrive successively the optical network unit B in the sub-passive optical-fiber network PON2 of protection group each other with the optical network unit A of sub-passive optical-fiber network PON1;
In optical network unit B in sub-passive optical-fiber network PON2, downlink optical signal is successively through the 3rd optical circulator 1 port, the 3rd chirp grating, the 4th optical circulator 2 ports, the 4th optical circulator 3 ports, and light signal is afterwards sent to the optical network unit A end of the sub-passive optical-fiber network PON1 breaking down through interconnection fabric, in sub-passive optical-fiber network PON1, light signal is successively through the second optical circulator 3 ports, the second chirp grating optical fiber, the second optical circulator 4 ports, 2 × 2 coupler A, enter descending Optical Receivers A from 2 × 2 coupler A light signal part out, another part enters in reflection type optical amplifier A for up wavelength remodulates, light signal after reflection type optical amplifier A remodulates is successively through 2 × 2 coupler A, the second optical circulator 1 port, the first chirp grating optical fiber, the second optical circulator 2 ports, be sent to the optical network unit B of sub-passive optical-fiber network PON2 through interconnection fabric from the second optical circulator 3 ports light signal out, and successively through the 4th optical circulator 3 ports, the 4th chirp grating optical fiber, the 3rd optical circulator 4 ports, from the 3rd optical circulator 1 port uplink optical signal process distribution type fiber-optic B out, the 4th array waveguide grating, the second feeder line optical fiber, the second array waveguide grating and Coarse Wave Division Multiplexer, in the final optical transceiver that arrives sub-passive optical-fiber network PON1, thereby complete the recovery of data service, realize protection of resources.
Compared with prior art, the present invention has following beneficial effect:
(1) in each WDM-PON, adopt decolorizable optical network unit technology, can effectively reduce the cost of optical network unit, and utilize chirped fiber grating to realize the selection of wide range wavestrip, there is advantage cheaply;
(2) detection to fiber failure and protection are all carried out at optical line terminal, do not increase the operation complexity of optical network unit;
(3) by sharing fiber link, two WDM-PON systems can be mutually each other the other side protection link is provided, thereby avoided the use of backup feeder line optical fiber and backup distribution type fiber-optic, the quantity of slack has been dropped to minimum.
Brief description of the drawings
By reading the detailed description of non-limiting example being done with reference to the following drawings, it is more obvious that other features, objects and advantages of the present invention will become:
Fig. 1 is that the present invention has two WDM-PON network architecture of mutual protection mechanism and the system schematic of guard method;
Fig. 2 is optical network unit structure and burst mode schematic diagram;
Fig. 3 is the structural representation of the optical transceiver of optical line terminal;
Wrap protection schematic diagram when Fig. 4 is fiber failure generation.
Embodiment
Below in conjunction with specific embodiment, the present invention is described in detail.Following examples will contribute to those skilled in the art further to understand the present invention, but not limit in any form the present invention.It should be pointed out that to those skilled in the art, without departing from the inventive concept of the premise, can also make some distortion and improvement.These all belong to protection scope of the present invention.
As shown in Figure 1, the present embodiment comprises two sub-PON(Passive Optical Network, passive optical-fiber network), be respectively sub-passive optical-fiber network PON1 and sub-passive optical-fiber network PON2.Sub-passive optical-fiber network PON1 transmission C-band red tape wavelength signals, sub-passive optical-fiber network PON2 transmission C-band blue zone wavelength signals.Every sub-PON comprises optical line terminal, feeder line optical fiber, distant-end node, distribution type fiber-optic and optical network unit.In every sub-PON, the optical transceiver of the N in described optical line terminal respectively with the first array waveguide grating AWG((Arrayed Waveguide Grating, array waveguide grating) be connected with the second array waveguide grating AWG; The other end of the first array waveguide grating AWG and the second array waveguide grating AWG is connected with the first feeder line optical fiber and the second feeder line optical fiber respectively; The other end of the first feeder line optical fiber and the second feeder line optical fiber is connected with the distant-end node that the 3rd array waveguide grating AWG and the 4th array waveguide grating AWG form respectively; The other end of distant-end node is connected with distribution type fiber-optic; Distribution type fiber-optic transmits data to optical network unit; Optical network unit in sub-passive optical-fiber network PON1 and sub-passive optical-fiber network PON2 between two in groups, and is connected by an interconnection fabric, for share protect link is provided each other.In described two WDM-PON architectures, sub-passive optical-fiber network PON1 and sub-passive optical-fiber network PON2 include N optical transceiver and N optical network unit, and described N is natural number; All AWG all have identical FSR(Free Spectral Range, free spectral range).
Further, optical line terminal comprises: optical transceiver, Coarse Wave Division Multiplexer, the first array waveguide grating AWG, the second array waveguide grating AWG and Erbium-Doped Fiber Amplifier.In every sub-PON, the optical transceiver of the N in optical line terminal is connected with the first array waveguide grating AWG and the second array waveguide grating AWG respectively by Coarse Wave Division Multiplexer.Coarse Wave Division Multiplexer is used for separating with coupling and is operated in C-band red tape wavelength signals and the blue zone wavelength signals in different sub-PON.Utilize the route cycle characteristics of AWG, the wavelength signals of the different wavestrips of sub-passive optical-fiber network PON1 and sub-passive optical-fiber network PON2 can realize multiplexing and demultiplexing in AWG.The first array waveguide grating AWG in described optical line terminal, downstream signal that the second array waveguide grating AWG sends optical transceiver is multiplexing and be transferred to corresponding feeder line optical fiber, and the light signal demultiplexing that the transmission of feeder line uplink optical fiber is come be transferred to optical transceiver by Coarse Wave Division Multiplexer.
Further, as shown in Figure 2, described each optical network unit includes Optical Receivers, RSOA(reflection type optical amplifier), 2 × 2 couplers, two optical circulators and two chirped fiber gratings.The descending luminous power receiving is divided into two parts by 2 × 2 couplers: a part is injected descending Optical Receivers, for downlink data receiving; Another part luminous power is injected into carries out remodulates in the RSOA of gain saturation state and signal amplifies, and realizes uplink.Two described chirped fiber gratings have the characteristic of wide reflectance spectrum, realize the function of choosing self WDM-PON work wavestrip.Chirped fiber grating reflectance spectrum in sub-passive optical-fiber network PON1 is C-band red tape, and the chirped fiber grating reflectance spectrum in sub-passive optical-fiber network PON2 is C-band blue zone.Taking sub-passive optical-fiber network PON1 as example, descending light signal arrives after optical network unit, through the first optical circulator 1 port, the first chirp grating optical fiber, the first optical circulator 2 ports, 2 × 2 couplers, enter downlink receiver from 2 × 2 couplers light signal part out, another part enters in RSOA for up wavelength remodulates successively.Light signal after RSOA remodulates, successively through 2 × 2 couplers, the first optical circulator 3 ports, the second chirp grating optical fiber, the first optical circulator 4 ports, the first optical circulator 1 port, is sent to distant-end node place through distribution type fiber-optic afterwards and does uplink.
Further, as shown in Figure 3, optical transceiver comprises optical transmission module, Optical Receivers, optical circulator, 1 × 2 optical switch, network control unit MCC, 10:90 coupler.Circulator in optical transceiver is used for separating uplink and downlink signal.Described network control unit MCC comprises a photo-detector (PD) and a control circuit.The coupler of 10:90 is isolated 10% up luminous power, enters the PD in MCC unit.According to the testing result of PD, the control circuit in MCC unit can be adjusted the connected state of 1 × 2 optical switch.When PD can't detect light signal (while being link occurs fault), MCC unit just produces a signal of telecommunication and is used for switching the connected state of 1 × 2 optical switch, makes 1 × 2 optical switch from the first port-the second port translation to the first port-tri-ports.
As shown in Figure 4, the system of utilizing the present embodiment to provide, its guard method comprises the following steps:
Step 1, the network control unit MCC in optical transceiver carries out state-detection to its corresponding feeder line optical fiber and distribution type fiber-optic;
Step 2, in the time that the distribution type fiber-optic of an optical network unit connection breaks down, the network control unit MCC that optical line terminal is corresponding detects fault, and control network control unit 1 × 2 optical switch change connection status, be converted to the first port-tri-ports from the first port-the second port status; Or
In the time that a feeder line optical fiber breaks down, network control unit MCC all in the sub-PON breaking down all detect fault, and the connection status of controlling 1 × 2 all optical switches is the first port-tri-ports;
Step 3, the sub-PON downlink data breaking down is realized transfer of data by the optical fiber link of sharing another PON in two PON structures.If the optical fiber link of sub-passive optical-fiber network PON1 breaks down, downlink optical signal enters the second array waveguide grating AWG through Coarse Wave Division Multiplexer.Due to the circulation routing characteristic of AWG; this signal can pass through this second array waveguide grating AWG; and pass through successively feeder line optical fiber, after the 4th array waveguide grating AWG and distribution type fiber-optic, arrive and the optical network unit of the sub-passive optical-fiber network PON1 optical network unit in the sub-passive optical-fiber network PON2 of protection group each other.In optical network unit in sub-passive optical-fiber network PON2, downlink optical signal is successively through the 3rd optical circulator 1 port, the 3rd chirp grating, the 4th optical circulator 2 ports, the 4th optical circulator 3 ports, and light signal is afterwards sent to the optical network unit end of the sub-passive optical-fiber network PON1 breaking down through interconnection fabric.In sub-passive optical-fiber network PON1, light signal is successively through the second optical circulator 3 ports, the second chirp grating optical fiber, the second optical circulator 4 ports, 2 × 2 couplers, enter downlink receiver from 2 × 2 couplers light signal part out, another part enters in RSOA for up wavelength remodulates.Light signal after RSOA remodulates is successively through 2 × 2 couplers, the second optical circulator 1 port, the first chirp grating optical fiber, the second optical circulator 2 ports, from the second optical circulator 3 ports light signal out
Interconnection fabric is sent in the optical network unit of sub-passive optical-fiber network PON2; and successively through the 4th optical circulator 3 ports, the 4th chirp grating optical fiber, the 3rd optical circulator 4 ports; from the 3rd optical circulator 1 port uplink optical signal process distribution type fiber-optic out; the 4th array waveguide grating AWG; feeder line optical fiber; the second array waveguide grating AWG and Coarse Wave Division Multiplexer; in the final optical transceiver that arrives sub-passive optical-fiber network PON1; thereby complete the recovery of data service, realize protection of resources.
The advantage of the present embodiment is:
(1) in each WDM-PON, adopt decolorizable optical network unit technology, can effectively reduce the cost of optical network unit, and utilize chirped fiber grating to realize the selection of wide range wavestrip, there is advantage cheaply;
(2) detection to fiber failure and protection are all carried out at optical line terminal, do not increase the operation complexity of optical network unit;
(3) by sharing fiber link, two WDM-PON systems can be mutually each other the other side protection link is provided, thereby avoided the use of backup feeder line optical fiber and backup distribution type fiber-optic, the quantity of slack has been dropped to minimum.
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 amendment within the scope of the claims, and this does not affect flesh and blood of the present invention.
Claims (6)
1. two WDM-PON network architecture with mutual protection mechanism, is characterized in that, comprising: the sub-passive optical-fiber network PON2 of the sub-passive optical-fiber network PON1 of transmission C-band red tape wavelength signals, transmission C-band blue zone wavelength signals;
Sub-passive optical-fiber network PON1, comprising: optical line terminal A, the first array waveguide grating, the first feeder line optical fiber, distant-end node A, distribution type fiber-optic A and optical network unit A;
Sub-passive optical-fiber network PON2, comprising: optical line terminal B, the second array waveguide grating, the second feeder line optical fiber, distant-end node B, distribution type fiber-optic B and optical network unit B;
Optical line terminal A, optical line terminal B include N optical transceiver, and optical transceiver is connected with one end of the first array waveguide grating, one end of the second array waveguide grating respectively;
The other end of the first array waveguide grating is connected to one end of distant-end node A by the first feeder line optical fiber, distant-end node A is mainly made up of the 3rd array waveguide grating;
The other end of the second array waveguide grating is connected to one end of distant-end node B by the second feeder line optical fiber, distant-end node B is mainly made up of the 4th array waveguide grating;
The other end of distant-end node A transmits data to N optical network unit A by distribution type fiber-optic A;
The other end of distant-end node B transmits data to N optical network unit B by distribution type fiber-optic B;
Described N optical network unit A and N optical network unit B between two in groups, and are connected by an interconnection fabric, for share protect link is provided each other;
The first array waveguide grating, the second array waveguide grating, the 3rd array waveguide grating, the 4th array waveguide grating, all have identical free spectral range FSR.
2. two WDM-PON network architecture with mutual protection mechanism according to claim 1, is characterized in that, described optical line terminal A and optical line terminal B include: Coarse Wave Division Multiplexer, Erbium-Doped Fiber Amplifier;
Optical line terminal A is all connected with the first array waveguide grating and the second array waveguide grating respectively by Coarse Wave Division Multiplexer with the optical transceiver in optical line terminal B;
Coarse Wave Division Multiplexer is for separating of being operated in C-band red tape wavelength signals and the blue zone wavelength signals in sub-passive optical-fiber network PON1 and sub-passive optical-fiber network PON2 with coupling;
The first array waveguide grating, the second array waveguide grating are all multiplexing for downstream signal that optical transceiver is sent and be transferred to the first feeder line optical fiber, the second feeder line optical fiber by Erbium-Doped Fiber Amplifier respectively, and the light signal demultiplexing respectively the first feeder line optical fiber, the second feeder line uplink optical fiber transmission being come be transferred to optical transceiver by Coarse Wave Division Multiplexer.
3. two WDM-PON network architecture with mutual protection mechanism according to claim 1, is characterized in that,
Optical network unit A comprises: Optical Receivers A, reflection type optical amplifier A, 2 × 2 coupler A, the first optical circulator, the second optical circulator, the first chirped fiber grating, the second chirped fiber grating;
Optical network unit B comprises: Optical Receivers B, reflection type optical amplifier B, 2 × 2 coupler B, the 3rd optical circulator, the 4th optical circulator, the 3rd chirped fiber grating, the 4th chirped fiber grating;
The descending luminous power receiving is divided into two parts by 2 × 2 coupler A: a part is injected descending Optical Receivers A, for downlink data receiving; Another part luminous power is injected into carries out remodulates in the reflection type optical amplifier A of gain saturation state and signal amplifies, and realizes uplink;
The descending luminous power receiving is divided into two parts by 2 × 2 coupler B: a part is injected descending Optical Receivers B, for downlink data receiving; Another part luminous power is injected into carries out remodulates in the reflection type optical amplifier B of gain saturation state and signal amplifies, and realizes uplink;
The first chirped fiber grating, the second chirped fiber grating, the 3rd chirped fiber grating, the 4th chirped fiber grating all have the characteristic of wide reflectance spectrum, realize the function of choosing self WDM-PON work wavestrip; Wherein, the chirped fiber grating reflectance spectrum of the first chirped fiber grating, the second chirped fiber grating is C-band red tape, and the chirped fiber grating reflectance spectrum of the 3rd chirped fiber grating, the 4th chirped fiber grating is C-band blue zone;
(A) when group passive optical-fiber network PON1, the equal fault-free of sub-passive optical-fiber network PON2:
When descending light signal arrives after optical network unit A, through the first optical circulator 1 port, the first chirp grating optical fiber, the first optical circulator 2 ports, 2 × 2 coupler A, enter descending Optical Receivers A from 2 × 2 coupler A light signal part out, another part enters in reflection type optical amplifier A for up wavelength remodulates successively; Light signal after reflection type optical amplifier A remodulates, successively through 2 × 2 coupler A, the first optical circulator 3 ports, the second chirp grating optical fiber, the first optical circulator 4 ports, the first optical circulator 1 port, is sent to distant-end node A place through distribution type fiber-optic A afterwards and does uplink;
Descending light signal arrives after optical network unit B, through the 3rd optical circulator 1 port, the 3rd chirp grating optical fiber, the 3rd optical circulator 2 ports, 2 × 2 coupler B, enter descending Optical Receivers B from 2 × 2 coupler B light signal part out, another part enters in reflection type optical amplifier B for up wavelength remodulates successively; Light signal after reflection type optical amplifier B remodulates, successively through 2 × 2 coupler B, the 3rd optical circulator 3 ports, the 4th chirp grating optical fiber, the 3rd optical circulator 4 ports, the 3rd optical circulator 1 port, is sent to distant-end node B place through distribution type fiber-optic B afterwards and does uplink;
(B) when the first feeder line optical fiber of group passive optical-fiber network PON1 or distribution type fiber-optic A break down:
The downlink optical signal of sub-passive optical-fiber network PON1 enters the second array waveguide grating through Coarse Wave Division Multiplexer, due to the circulation routing characteristic of the second array waveguide grating, this light signal will be by the second array waveguide grating, and after the second feeder line optical fiber, the 4th array waveguide grating, distribution type fiber-optic B, arrive successively the optical network unit B in the sub-passive optical-fiber network PON2 of protection group each other with the optical network unit A of sub-passive optical-fiber network PON1;
When descending light signal arrives after optical network unit B, downlink optical signal is successively through the 3rd optical circulator 1 port, the 3rd chirp grating, the 4th optical circulator 2 ports, the 4th optical circulator 3 ports, and light signal is afterwards sent to the optical network unit A end of the sub-passive optical-fiber network PON1 breaking down through interconnection fabric, in sub-passive optical-fiber network PON1, light signal is successively through the second optical circulator 3 ports, the second chirp grating optical fiber, the second optical circulator 4 ports, 2 × 2 coupler A, enter descending Optical Receivers A from 2 × 2 coupler A light signal part out, another part enters in reflection type optical amplifier A for up wavelength remodulates, light signal after reflection type optical amplifier A remodulates is successively through 2 × 2 coupler A, the second optical circulator 1 port, the first chirp grating optical fiber, the second optical circulator 2 ports, be sent to the optical network unit B of sub-passive optical-fiber network PON2 through interconnection fabric from the second optical circulator 3 ports light signal out, and successively through the 4th optical circulator 3 ports, the 4th chirp grating optical fiber, the 3rd optical circulator 4 ports, from the 3rd optical circulator 1 port uplink optical signal process distribution type fiber-optic B out, the 4th array waveguide grating, the second feeder line optical fiber, the second array waveguide grating and Coarse Wave Division Multiplexer, in the final optical transceiver that arrives sub-passive optical-fiber network PON1, thereby complete the recovery of data service, realize protection of resources.
4. two WDM-PON network architecture with mutual protection mechanism according to claim 1, it is characterized in that, optical transceiver comprises: optical transmission module, Optical Receivers C, the 5th optical circulator, 1 × 2 optical switch, network control unit MCC, 10:90 coupler;
The 5th optical circulator is for separating of uplink and downlink signal; The 5th optical circulator 1 port connects optical transmission module, and the 5th optical circulator 2 ports connect the first port of 1 × 2 optical switch, and the 5th optical circulator 3 ports connect Optical Receivers C;
The first port of 1 × 2 optical switch connects the second port or the 3rd port of 1 × 2 optical switch under the control of network control unit MCC;
Network control unit MCC comprises a photo-detector PD and a control circuit; 10:90 coupler is isolated 10% up luminous power, enters the photo-detector PD in network control unit MCC, and the control circuit in network control unit MCC is adjusted the connected state of 1 × 2 optical switch according to the testing result of photo-detector PD; When photo-detector, PD can't detect light signal, and network control unit MCC just produces a signal of telecommunication and be used for switching the connected state of 1 × 2 optical switch, makes 1 × 2 optical switch connect the second port translation from the first port and connects the 3rd port to the first port.
5. utilize a guard method for the two WDM-PON network architecture with mutual protection mechanism described in claim 4, it is characterized in that, comprise the steps:
Step 1, the network control unit MCC in optical transceiver carries out state-detection to its corresponding feeder line optical fiber and distribution type fiber-optic; Wherein, corresponding the first feeder line optical fiber of network control unit MCC and distribution type fiber-optic A in optical line terminal A, corresponding the second feeder line optical fiber of network control unit MCC and distribution type fiber-optic B in optical line terminal B;
Step 2, in the time that a distribution type fiber-optic in the distribution type fiber-optic B that distribution type fiber-optic A, optical network unit B that optical network unit A connects connect breaks down, corresponding network control unit MCC detects fault, and control 1 × 2 optical switch change connection status in network control unit MCC, connect the second port status from the first port and be converted to the first port connection the 3rd port; Or
In the time that a feeder line optical fiber in the second feeder line optical fiber of the first feeder line optical fiber of the sub-passive optical-fiber network PON1 of correspondence, corresponding sub-passive optical-fiber network PON2 breaks down, in the corresponding sub-passive optical-fiber network breaking down, all network control unit MCC all detect fault, and the connection status of controlling 1 × 2 all optical switches is that the first port connects the 3rd port;
Step 3, the sub-passive optical-fiber network downlink data at the place of breaking down is realized transfer of data by the optical fiber link of sharing another sub-passive optical-fiber network.
6. utilization according to claim 5 has the guard method of two WDM-PON network architecture of mutual protection mechanism, it is characterized in that, when the optical fiber link of group passive optical-fiber network PON1 breaks down, the downlink optical signal of sub-passive optical-fiber network PON1 enters the second array waveguide grating through Coarse Wave Division Multiplexer, due to the circulation routing characteristic of the second array waveguide grating, this light signal will be by the second array waveguide grating, and successively through the second feeder line optical fiber, the 4th array waveguide grating, after distribution type fiber-optic B, arrive the optical network unit B in the sub-passive optical-fiber network PON2 of protection group each other with the optical network unit A of sub-passive optical-fiber network PON1,
In optical network unit B in sub-passive optical-fiber network PON2, downlink optical signal is successively through the 3rd optical circulator 1 port, the 3rd chirp grating, the 4th optical circulator 2 ports, the 4th optical circulator 3 ports, and light signal is afterwards sent to the optical network unit A end of the sub-passive optical-fiber network PON1 breaking down through interconnection fabric, in sub-passive optical-fiber network PON1, light signal is successively through the second optical circulator 3 ports, the second chirp grating optical fiber, the second optical circulator 4 ports, 2 × 2 coupler A, enter descending Optical Receivers A from 2 × 2 coupler A light signal part out, another part enters in reflection type optical amplifier A for up wavelength remodulates, light signal after reflection type optical amplifier A remodulates is successively through 2 × 2 coupler A, the second optical circulator 1 port, the first chirp grating optical fiber, the second optical circulator 2 ports, be sent to the optical network unit B of sub-passive optical-fiber network PON2 through interconnection fabric from the second optical circulator 3 ports light signal out, and successively through the 4th optical circulator 3 ports, the 4th chirp grating optical fiber, the 3rd optical circulator 4 ports, from the 3rd optical circulator 1 port uplink optical signal process distribution type fiber-optic B out, the 4th array waveguide grating, the second feeder line optical fiber, the second array waveguide grating and Coarse Wave Division Multiplexer, in the final optical transceiver that arrives sub-passive optical-fiber network PON1, thereby complete the recovery of data service, realize protection of resources.
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