CN103118308B - A kind of soft exchange passive network supporting quantum communications - Google Patents
A kind of soft exchange passive network supporting quantum communications Download PDFInfo
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Abstract
Support a soft exchange passive network scheme for quantum communications, can this network be supported to meet ITU-T? G.984 the EPON bidirectional data communication of GPON or the IEEE802.3 specification of specification and the quantum-key distribution QKD of up direction.The optical network unit of improvement is adopted on the basis of original GPON or EPON, to the addition of QKD reflector and replace time division multiple access access control module in network; Adopt the optical line terminal improved on the basis of original GPON or EPON, with the addition of QKD receiver and Clock Extraction module; The passive optical splitters improved is adopted to comprise two 1:N optical splitters and N number of Bragg grating (N is optical network unit quantity).Overall network largely avoid the interference of high light signal to quantum signal, QKD can be deposited with GPON or EPON.The present invention thoroughly can improve the potential security hole of general Optical Access Network, and provides feasible program for Technique on Quantum Communication to the universal of fiber to the home (building) FTTx access network.
Description
Technical field
The present invention relates to Networks of Fiber Communications field, a kind of fiber to the home (building) (FTTx) EPON architectural schemes supporting quantum communications (or being called quantum-key distribution QKD), be applicable to support Gigabit Passive Optical Network (GPON) or ethernet passive optical network (EPON) transfer of data, and the FTTx access network higher to security request data.
Background technology
The FTTx broadband access network being representative with GPON, EPON technology is becoming the main way of cable broadband access, but GPON and EPON network has certain potential problem in fail safe: its descending (referring to from optical line terminal OLT to optical network unit ONU) data send to all ONU in a broadcast manner, eavesdrop to prevent illegal ONU, must be encrypted respectively the downlink data of each ONU, the safety approach used at present is:
Scheme one: OLT utilizes different double secret key to send to the data of each ONU to carry out stirring (churning) encryption, and key length is 3 bytes, the number produced at random by 3 byte OLT and calculating from 3 byte datas that this ONU provides.The data provided due to ONU are clear-text way, add that key length is shorter, make its fail safe can not meet the business of high requirement, do not get rid of the possibility of the equipment that there will be eavesdropping up direction (referring to from ONU to OLT) signal from now on.
Scheme two: use Advanced Encryption Standard (AES) enciphered data to replace stirring the better fail safe of acquisition.But AES key exchanges and generally adopts the Diffie-Hellman exchange algorithm based on discrete logarithm problem and the RSA exchange of public keys algorithm based on prime factor resolution problem.Owing to not having mathematical strict theoretical proof, the fail safe of above-mentioned algorithm is just based upon on empirical basis, might not be reliable.1994, the quantum algorithm of the PeterShor proposition in U.S. AT & TBell laboratory can complete and solve prime factor in multinomial step number, this algorithm coordinates the quantum computer that can may occur from now on, can produce threaten greatly RSA public key algorithm.
Become more and more thorny along with the large area laying of optical access network and the growth of business will make to process these security breaches, and the cost thoroughly solved is also more and more huger.Can predict, along with increasing rapidly of internet scale and optical access network userbase, the demand improved confidentiality business and data communications security rank the coming years can volatile lifting, therefore a kind of FTTx access network framework that can be compatible current is found, and can integratedly resist at present and the new network of the safe practice of new generation of future secure threat be the important research direction of network research personnel, be also the important leverage of network insertion industry development.
On the other hand, Technique on Quantum Communication, quantum-key distribution (QKD) shared key that can be perfectly safe between two remote communication entity more precisely, what this process relied on is the mathematical computations complexity that quantum-mechanical physical law instead of usual encryption key distribution rely on, thus allows the fail safe of system bring up to a new high.Various QKD fiber optic network has been had to verify experimentally and run, but these networks current are all independent construction (rent separately or lay optical fiber), make its construction cost very expensive, practicality is had a greatly reduced quality, and also constrains QKD technology popularizing to commercial market.If utilize the ripe network of laying, then can reduce rapidly QKD network cost, but (different wave length) inevitably can be subject to the Raman scattering impact of high light when quantum signal and high light signal transmit in same optical fiber, because quantum luminous power is generally in the rank of-80dBm, lower than the several order of magnitude of high light power-10dBm, it is impossible for therefore transmitting with fibre simultaneously substantially.In a word, the grid-connected transmission problem of quantum communications and Conventional optical communication network is a difficult problem urgently to be resolved hurrily.
Summary of the invention
The present invention will overcome that prior art EPON access security is poor, quantum communications communicate with high light is difficult to the shortcoming of grid-connected transmission, provide and solve EPON access security problem and quantum communications and to communicate with high light a kind of passive optical access network scheme framework of a grid-connected transmission difficult problem, quantum communications and GPON, EPON data service can be supported in same FTTx access network, thus can the underlying security of General Promotion Optical Access Network.
The technical solution adopted for the present invention to solve the technical problems is:
A kind of soft exchange passive network supporting quantum communications, it is characterized in that: the soft exchange passive network of described support quantum communications QKD comprises the optical network unit ONU of N number of improvement, 1 optical line terminal OLT improved and 1 optical branching device OBD improved, and network adopts star topology;
The optical network unit improved has 1 optical interface (hybrid interface) and is connected to OBD, its inside comprises the Gigabit Passive Optical Network GPON or the ethernet passive optical network EPON downlink reception device of IEEE802.3 specification, up reflector that meet ITU-TG.984 specification, quantum-key distribution reflector, wavelength division multiplexer and alternately TDMA control module; Alternately TDMA control module control QKD reflector produce in good time quantum signal and up reflector upward signal after wavelength division multiplexing again with downstream signal wavelength division multiplexing to ONU optical interface;
The optical line terminal improved has high light interface and quantum interface is connected to OBD, its inside comprises ethernet passive optical network EPON downlink device, the uplink receiving device of Gigabit Passive Optical Network GPON or the IEEE802.3 specification meeting ITU-TG.984 specification, quantum-key distribution receiver, wavelength division multiplexer, and QKD Clock Extraction module; Uplink and downlink signals adopts wave division multiplex mode to transfer to high light interface, and the quantum signal of quantum interface enters QKD receiver after narrow band narrow band light filtering, QKD Clock Extraction module is extracted synchronised clock and is controlled for the detection of quantum single-photon detector from upward signal;
Described downlink reception device, up reflector, quantum-key distribution reflector, downlink device, uplink receiving device, quantum-key distribution receiver are by optical module and circuit composition;
The optical splitter improved has high light interface and quantum interface is connected to OLT and N number of optical interface (hybrid interface) is connected to ONU, its internal structure is that the ordinary beamsplitter of 1:N to be connected with N number of optical fiber bragg grating FBG and to form by 2 branching ratios, and wherein N is the number of optical network unit; Wherein the conjunction optical port of 1 optical splitter is connected to the high light interface of OBD, and N number of branch port is connected with the common port of N number of Fiber Bragg Grating FBG respectively; The conjunction optical port of other 1 optical splitter is connected to the quantum interface of OBD, and N number of branch port is connected with the filtering port of N number of Fiber Bragg Grating FBG respectively, and grating filters wavelength is quantum wavelength; Another common port of N number of Fiber Bragg Grating FBG is connected to N number of hybrid interface of OBD;
Replace TDMA control module in optical network unit, every two-way optical network unit carries out static binding, has bound A and B; The GRANT information of USBW information or EPON descending GATE frame that the alternately TDMA control module in A reads GPON downlink frame PCBd block calculates the up beginning time slot of mandate of B and terminates time slot, when B is when sending upstream data, A control module control QKD reflector quantum signal, equally, when A is when sending upstream data, B control module control QKD reflector quantum signal.
Further, the soft exchange passive network of described support quantum communications also comprises:
Binding relationship dynamic conditioning module in ONU, the USBW information of GPON downlink frame PCBd block upgraded according to the cycle or the GRANT information dynamic conditioning of the descending GATE frame of EPON optical network unit binding relationship when upstream data sends next time; Adjustment algorithm is:
Suppose have N number of ONU, N can not be odd number, ONU
k, k=1,2 ..., N, has 1 QKD, ONU in corresponding each ONU
k→ QKD
k, k=1,2 ..., N.All ONU are arranged as P_ONU, and all QKD are arranged as P_QKD, then binding relationship is P_ONU → P_QKD.
Step 1: all ONU are arranged according to the order from small to large of the LLID in ONUID or EPON in GPON, obtains ONU and arrange P_ONU (1) for the 1st time.ONUID and LLID from downlink broadcast frame or can specify acquisition;
Step 2: according to arrangement P_ONU (1) by the QKD of correspondence adjacent exchange between two, obtains QKD and arranges P_QKD (1).Thus form the 1st binding relationship P_ONU (1) → P_QKD (1);
Step 3: according to i-th (i >=1) secondary USBW or GRANT information, by QKD according to distributing slot length order arrangement from small to large, if it is identical to distribute slot length, then little forward of ONUID or LLID, obtains QKD pre-arrangement P_QKD ~ (i+1);
Step 4: according to the i-th+1 time USBW or GRANT information, by ONU according to distributing slot length order arrangement from big to small, if it is identical to distribute slot length, then little forward of ONUID or LLID, obtains ONU and arranges P_ONU (i+1);
Step 5: check arrangement P_ONU (i+1) and P_QKD ~ (i+1), if there be ONU with QKD of correspondence position identical, then adjacent exchange adjustment is carried out to pre-arrangement P_QKD ~ (i+1), obtain P_QKD (i+1), thus finally form the i-th+1 time binding relationship P_ONU (i+1) → P_QKD (i+1);
Step 6: repeat step 3, step 4 and step 5.
Technical conceive of the present invention is: propose a kind of soft exchange passive network framework supporting quantum communications, comprises optical network unit ONU, 1 optical line terminal OLT improved and 1 optical branching device OBD improved that N number of (natural number) improves.In network, data uplink and downlink mode is identical with GPON, EPON, and up quantum signal is by after the by-passing of alternately time division multiple access access control and OBD, and high light signal is fully isolated, and does not provide key-switch function for downlink data with affecting by it.
Beneficial effect of the present invention is mainly manifested in: 1, overall network largely avoid the interference of high light signal to quantum signal, QKD can be deposited, for Technique on Quantum Communication provides feasible program to the universal of fiber to the home (building) FTTx access network with GPON or EPON.2, because downlink broadcast data have carried out the AES encryption adopting quantum key, therefore can ensure its fail safe, stop the leak that current GPON, EPON are possible.Decrease the data delay because Diffie-Hellman Diffie-Hellman brings and amount of calculation simultaneously.
Accompanying drawing explanation
Fig. 1 is the internal structure of optical network unit ONU of the present invention, gets λ
dOWNSTREAM=1490nm, λ
uPTREAM=1310nm, λ
qKD=1290nm
Fig. 2 is the internal structure of optical line terminal OLT of the present invention, gets λ
dOWNSTREAM=1490nm, λ
uPTREAM=1310nm, λ
qKD=1290nm
Fig. 3 is the internal structure of optical branching device OBD of the present invention, gets λ
dOWNSTREAM=1490nm, λ
uPTREAM=1310nm, λ
qKD=1290nm
Fig. 4 be optical network unit of the present invention and QKD static binding time alternately tdma slot distribute schematic diagram
Fig. 5 is optical network unit number N=16 of the present invention, and network configuration example during transmission range 20km, wherein QKD system have employed Faraday-Michelson phase interference ring
Fig. 6 is the quantum bit error rate QBER simulation value of Fig. 5 profile instance and corresponding safe key speed R
sECURE
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described.
A kind of soft exchange passive network supporting quantum communications, it is characterized in that: the soft exchange passive network of described support quantum communications QKD comprises the optical network unit ONU of N number of improvement, 1 optical line terminal OLT improved and 1 optical branching device OBD improved, and network adopts star topology;
The optical network unit improved has 1 optical interface (hybrid interface) and is connected to OBD, its inside comprises the Gigabit Passive Optical Network GPON or the ethernet passive optical network EPON downlink reception device of IEEE802.3 specification, up reflector that meet ITU-TG.984 specification, quantum-key distribution reflector, wavelength division multiplexer and alternately TDMA control module; Alternately TDMA control module control QKD reflector produce in good time quantum signal and up reflector upward signal after wavelength division multiplexing again with downstream signal wavelength division multiplexing to ONU optical interface;
The optical line terminal improved has high light interface and quantum interface is connected to OBD, its inside comprises ethernet passive optical network EPON downlink device, the uplink receiving device of Gigabit Passive Optical Network GPON or the IEEE802.3 specification meeting ITU-TG.984 specification, quantum-key distribution receiver, wavelength division multiplexer, and QKD Clock Extraction module; Uplink and downlink signals adopts wave division multiplex mode to transfer to high light interface, and the quantum signal of quantum interface enters QKD receiver after narrow band narrow band light filtering, QKD Clock Extraction module is extracted synchronised clock and is controlled for the detection of quantum single-photon detector from upward signal;
Described downlink reception device, up reflector, quantum-key distribution reflector, downlink device, uplink receiving device, quantum-key distribution receiver are by optical module and circuit composition;
The optical splitter improved has high light interface and quantum interface is connected to OLT and N number of optical interface (hybrid interface) is connected to ONU, its internal structure is that the ordinary beamsplitter of 1:N to be connected with N number of optical fiber bragg grating FBG and to form by 2 branching ratios, and wherein N is the number of optical network unit; Wherein the conjunction optical port of 1 optical splitter is connected to the high light interface of OBD, and N number of branch port is connected with the common port of N number of Fiber Bragg Grating FBG respectively; The conjunction optical port of other 1 optical splitter is connected to the quantum interface of OBD, and N number of branch port is connected with the filtering port of N number of Fiber Bragg Grating FBG respectively, and grating filters wavelength is quantum wavelength; Another common port of N number of Fiber Bragg Grating FBG is connected to N number of hybrid interface of OBD;
Replace TDMA control module in optical network unit, every two-way optical network unit carries out static binding, has bound A and B; The GRANT information of USBW information or EPON descending GATE frame that the alternately TDMA control module in A reads GPON downlink frame PCBd block calculates the up beginning time slot of mandate of B and terminates time slot, when B is when sending upstream data, A control module control QKD reflector quantum signal, equally, when A is when sending upstream data, B control module control QKD reflector quantum signal.
Further, the soft exchange passive network of described support quantum communications also comprises:
Binding relationship dynamic conditioning module in ONU, the USBW information of GPON downlink frame PCBd block upgraded according to the cycle or the GRANT information dynamic conditioning of the descending GATE frame of EPON optical network unit binding relationship when upstream data sends next time; Adjustment algorithm is:
Suppose have N number of ONU, N can not be odd number, ONU
k, k=1,2 ..., N, has 1 QKD, ONU in corresponding each ONU
k→ QKD
k, k=1,2 ..., N.All ONU are arranged as P_ONU, and all QKD are arranged as P_QKD, then binding relationship is P_ONU → P_QKD.
Step 1: all ONU are arranged according to the order from small to large of the LLID in ONUID or EPON in GPON, obtains ONU and arrange P_ONU (1) for the 1st time.ONUID and LLID from downlink broadcast frame or can specify acquisition;
Step 2: according to arrangement P_ONU (1) by the QKD of correspondence adjacent exchange between two, obtains QKD and arranges P_QKD (1).Thus form the 1st binding relationship P_ONU (1) → P_QKD (1);
Step 3: according to i-th (i >=1) secondary USBW or GRANT information, by QKD according to distributing slot length order arrangement from small to large, if it is identical to distribute slot length, then little forward of ONUID or LLID, obtains QKD pre-arrangement P_QKD ~ (i+1);
Step 4: according to the i-th+1 time USBW or GRANT information, by ONU according to distributing slot length order arrangement from big to small, if it is identical to distribute slot length, then little forward of ONUID or LLID, obtains ONU and arranges P_ONU (i+1);
Step 5: check arrangement P_ONU (i+1) and P_QKD ~ (i+1), if there be ONU with QKD of correspondence position identical, then adjacent exchange adjustment is carried out to pre-arrangement P_QKD ~ (i+1), obtain P_QKD (i+1), thus finally form the i-th+1 time binding relationship P_ONU (i+1) → P_QKD (i+1);
Step 6: repeat step 3, step 4 and step 5.
With reference to Fig. 1, the optical network unit improved comprises the Gigabit Passive Optical Network GPON or the ethernet passive optical network EPON downlink reception device (optical module and circuit) of IEEE802.3 specification, up reflector (optical module and circuit) that meet ITU-TG.984 specification, quantum-key distribution reflector (optical module and circuit), wavelength division multiplexer and alternately TDMA control module.Alternately TDMA control module control QKD reflector produce in good time quantum signal and up reflector upward signal after wavelength division multiplexing again with downstream signal wavelength division multiplexing to ONU optical interface.When ONU initially power on to complete GPON or EPON require registration and ranging process complete front time, QKD reflector does not work, after ranging process completes, alternately TDMA control module is distributed USBW information from the upstream bandwidth the downlink frame controll block PCBd of GPON or from the descending GATE frame of EPON, is read mandate Grant information, if the ONU of binding has the allocated bandwidth sending upward signal, then control module control QKD reflector sends QKD signal in the ascending time slot of correspondence, the multiplexing optical fiber proceeding to OBD of CWDM again through 1310/1490 after CWDM by 1290/1310 is multiplexing.
With reference to Fig. 2, the optical line terminal improved comprises ethernet passive optical network EPON downlink device (optical module and circuit), the uplink receiving device (optical module and circuit) of Gigabit Passive Optical Network GPON or the IEEE802.3 specification meeting ITU-TG.984 specification, quantum-key distribution receiver (optical module and circuit), wavelength division multiplexer, and QKD Clock Extraction module.The uplink and downlink signals of high light interface adopts wave division multiplex mode transmission, and the quantum signal of quantum interface enters QKD receiver after the filtering of arrowband (50GHz) light, QKD Clock Extraction module is extracted synchronised clock and is controlled for the detection of quantum single-photon detector from upward signal.
With reference to Fig. 3, the optical splitter of improvement, its internal structure is that the ordinary beamsplitter of 1:N to be connected with N number of optical fiber bragg grating FBG and to form by 2 branching ratios, and wherein N is the number of optical network unit.Wherein the conjunction optical port of 1 optical splitter is connected to the high light interface of OBD, and N number of branch port is connected with the common port of N number of Fiber Bragg Grating FBG respectively; The conjunction optical port of other 1 optical splitter is connected to the quantum port of OBD, and N number of branch port is connected with the filtering port of N number of Fiber Bragg Grating FBG respectively, and grating filters wavelength is quantum wavelength.Another common port of N number of Fiber Bragg Grating FBG is connected to N number of hybrid interface of OBD.
With reference to Fig. 4, every two-way optical network unit carries out binding, and when wherein a road optical network unit is when sending upstream data, an other road optical network unit quantum signal, the quantum signal of same optical network unit and upward signal can not send simultaneously.
Suppose ONU
1and ONU
2bind, ONU
n-1and ONU
nbind.Work as ONU
1when sending upstream data, ONU
2send up quantum signal, enter quantum channel optical fiber after arriving OBD, finally enter the quantum end of probe of OLT, thus realize ONU
2qKD function; Equally, ONU is worked as
2when sending upstream data, ONU
1start QKD function.By that analogy.According to OLT, QKD function is realized with controlling to allow all ONU not conflict mutually to the precision ranging process of ONU and appropriate signaling.What in actual conditions, according to the situation of upstream bandwidth, binding relationship can carry out that dynamic conditioning makes that all ONU can be comparatively average carries out QKD communication.
With reference to Fig. 5, with the EPON of 1:16 branching ratio for example, ONU comprises the up reflector (optical module and circuit) meeting 1000BASE-PX20-U and require, line code NRZ, speed 1.25Gbps, λ
uPTREAM=1310nm; Meet the downlink reception device (optical module and circuit) that 1000BASE-PX20-D requires, line speed 1.25Gbps, λ
dOWNSTREAM=1490nm; λ
qKD=1290nm, FPGA controller is responsible for producing pseudo random sequence string (speed 1.25GHz), and the GRANT information control QKD continuous wave laser when the ONU ascending time slot bound starts reading descending GATE frame produces the continuous light of 1290nm, RZ pulse is produced through MZ modulation, after FM interference ring phase code also decay, enter CWDM multiplexer again, and finally enter to OBD optical fiber.After the shunt function of OBD, QKD signal enters the quantum interface of OLT.In OLT, QKD receiving system adopts BB84 agreement (two single-photon detector SPD), and QKD signal first filtered through narrow-band optical filter before entering FM interference ring.FPGA controller is responsible for the result of detection receiving single-photon detector, and realizes the Clock Extraction function of upward signal, with the opening time of control SPD.FPGA generates final safe key after to base and the operations such as amplification of maintaining secrecy, be supplied to downlink device and downlink reception device respectively, make it the AES encryption algorithm that the employing cycle upgrades 256 keys to be encrypted downlink data, thus ensure the fail safe of downlink data.
With reference to Fig. 6, the CWDM insertion loss of actual measurement 1290/1310,1310/1490 is 1dB, G.652 the monomode fiber loss 8dB(1290/1310nm of 20km), 5dB(1490nm), FBG insertion loss 1dB, 1:16 optical splitter loss 12dB, then uplink total losses are 24dB, downgoing line total losses are 20dB, meet the maximum 24dB power budget of 20km scope that in EPON, 1000BASE-PX20 requires, therefore, it is possible to meet the requirement of EPON transmission circuit system, the error rate is less than 10
-10.The loss of FM interference ring is 3dB, optical filter insertion loss 1dB, quantum wire total losses are about 28dB, the quantum efficiency of single-photon detector is 10%, counting rate is 78.1MHz, average every pulsed light subnumber 0.2, and pulse repetition frequency is 1.25GHz, it is Fig. 6 (a) that emulation obtains quantum bit error rate QBER, according to formula
R
sECURE=R
sIFT[1-2 × H (QBER)] (1) obtains the final average security secret-key rate of Fig. 6 (b) is about 2kbps, this secret-key rate can support that each ONU on average upgrades 1 AES key of 256 in every 2 seconds, more rapidly than the Diffie-Hellman exchange algorithm adopted at present, the data service demand for security of the overwhelming majority can be met for downlink data stream encryption.
The present invention devises a kind of passive optical access network network framework can supporting quantum-key distribution, recruitment sub-key distribution function while GPON, EPON transfer of data can be realized, GPON, EPON network than before has more fail safe, can realize to encrypted physical function that is descending, upstream data in Optical Access Network, the development for future secure data service provides a kind of important guarantee.
Claims (2)
1. support the soft exchange passive network of quantum communications for one kind, it is characterized in that: the soft exchange passive network of described support quantum communications QKD comprises the optical network unit ONU of N number of improvement, 1 optical line terminal OLT improved and 1 optical branching device OBD improved, the implication of QKD is quantum-key distribution, and network adopts star topology;
The optical network unit improved has 1 mixed light interface and is connected to OBD, its inside comprises the Gigabit Passive Optical Network GPON or the ethernet passive optical network EPON downlink reception device of IEEE802.3 specification, up reflector that meet ITU-TG.984 specification, QKD reflector, wavelength division multiplexer and alternately TDMA control module; Alternately TDMA control module control QKD reflector produce in good time quantum signal and up reflector upward signal after wavelength division multiplexing again with downstream signal wavelength division multiplexing to ONU mixed light interface;
The optical line terminal improved has high light interface and quantum interface is connected to OBD, its inside comprises ethernet passive optical network EPON downlink device, the uplink receiving device of Gigabit Passive Optical Network GPON or the IEEE802.3 specification meeting ITU-TG.984 specification, QKD receiver, wavelength division multiplexer, and QKD Clock Extraction module; Uplink and downlink signals adopts wave division multiplex mode to transfer to high light interface, and the quantum signal of quantum interface enters QKD receiver after narrow band narrow band light filtering, QKD Clock Extraction module is extracted synchronised clock and is controlled for the detection of quantum single-photon detector from upward signal;
Described downlink reception device, up reflector, quantum-key distribution reflector, downlink device, uplink receiving device, quantum-key distribution receiver are by optical module and circuit composition;
The optical splitter improved has high light interface and quantum interface is connected to OLT and N number of mixed light interface is connected to ONU, its internal structure is that the ordinary beamsplitter of 1:N to be connected with N number of optical fiber bragg grating FBG and to form by 2 branching ratios, and wherein N is the number of optical network unit; Wherein the conjunction optical port of 1 optical splitter is connected to the high light interface of OBD, and N number of branch port of this optical splitter is connected with the common port of N number of Fiber Bragg Grating FBG respectively; The conjunction optical port of other 1 optical splitter is connected to the quantum interface of OBD, and N number of branch port of this optical splitter is connected with the filtering port of N number of Fiber Bragg Grating FBG respectively, and grating filters wavelength is quantum wavelength; Another common port of N number of Fiber Bragg Grating FBG is connected to N number of mixed light interface of OBD;
Replace TDMA control module in the optical network unit improved, every two-way optical network unit is carried out static binding, supposes to have bound A and B two ONU; The GRANT information of USBW information or EPON descending GATE frame that the alternately TDMA control module in A reads GPON downlink frame PCBd block calculates the up beginning time slot of mandate of B and terminates time slot, when B is when sending upstream data, alternately TDMA control module control QKD reflector quantum signal in A, equally, when A is when sending upstream data, the alternately TDMA control module control QKD reflector quantum signal in B.
2. the soft exchange passive network supporting quantum communications as claimed in claim 1, is characterized in that: the soft exchange passive network of described support quantum communications also comprises:
Binding relationship dynamic conditioning module in ONU, the USBW information of GPON downlink frame PCBd block upgraded according to the cycle or the GRANT information dynamic conditioning of the descending GATE frame of EPON optical network unit binding relationship when upstream data sends next time; Adjustment algorithm is:
Suppose have N number of ONU, N can not be odd number, ONU
k, k=1,2 ..., N, has 1 QKD reflector, ONU in corresponding each ONU
k→ QKD
k, k=1,2 ..., N, all ONU are arranged as P_ONU, all QKD reflectors be arranged as P_QKD, then binding relationship is P_ONU → P_QKD;
Step 1: arranged according to the order from small to large of the LLID in ONUID or EPON in GPON by all ONU, obtain ONU and arrange P_ONU (1) for the 1st time, ONUID and LLID from downlink broadcast frame or can specify acquisition;
Step 2: according to arrangement P_ONU (1) by the adjacent exchange between two of the QKD reflector of correspondence, obtains QKD reflector arrangement P_QKD (1), thus forms the 1st binding relationship P_ONU (1) → P_QKD (1);
Step 3: according to i-th (i >=1) secondary USBW or GRANT information, by QKD reflector according to distributing slot length order arrangement from small to large, if it is identical to distribute slot length, then little forward of ONUID or LLID, obtains QKD reflector pre-arrangement P_QKD ~ (i+1);
Step 4: according to the i-th+1 time USBW or GRANT information, by ONU according to distributing slot length order arrangement from big to small, if it is identical to distribute slot length, then little forward of ONUID or LLID, obtains ONU and arranges P_ONU (i+1);
Step 5: check arrangement P_ONU (i+1) and P_QKD ~ (i+1), if there is ONU with the QKD reflector of correspondence position identical, then adjacent exchange adjustment is carried out to pre-arrangement P_QKD ~ (i+1), obtain P_QKD (i+1), thus finally form the i-th+1 time binding relationship P_ONU (i+1) → P_QKD (i+1);
Step 6: repeat step 3, step 4 and step 5.
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| CN103327422B (en) * | 2013-05-27 | 2015-11-25 | 浙江工业大学 | A kind of Low-cost passive optical network for video monitoring |
| CN104518868B (en) * | 2013-09-28 | 2019-03-26 | 科大国盾量子技术股份有限公司 | A kind of QKD system for resisting wavelength attack |
| CN104518867B (en) * | 2013-09-28 | 2019-05-21 | 科大国盾量子技术股份有限公司 | The method of wavelength attack is resisted in a kind of quantum key distribution system |
| WO2016101245A1 (en) * | 2014-12-26 | 2016-06-30 | 华为技术有限公司 | Optical splitter and passive optical network system |
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