CN103118308A - Optical access passive network supportive of quantum communication - Google Patents
Optical access passive network supportive of quantum communication Download PDFInfo
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- CN103118308A CN103118308A CN2013100299254A CN201310029925A CN103118308A CN 103118308 A CN103118308 A CN 103118308A CN 2013100299254 A CN2013100299254 A CN 2013100299254A CN 201310029925 A CN201310029925 A CN 201310029925A CN 103118308 A CN103118308 A CN 103118308A
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Abstract
Disclosed is an optical access passive network supportive of quantum communication. The network is supportive of bidirectional data communication of a GPON (gigabit passive optical network) accordant with the ITU (International Telecommunication Union)-T G.984 standard or an EPON (Ethernet passive optical network) accordant with the IEEE802.3 (Institute of Electrical and Electronics Engineers) standard and quantum key distribution (QKD) of uplink direction. An improved optical network unit is adopted in the network to add a QKD emitter and an alternating time-division multiple-address access control module on a basis of an original GPON or EPON, an improved optical line terminal is adopted to add a QKD receiver and a clock extraction module on a basis of the original GPON or EPON, and an improved passive optical splitter is adopted and comprises two 1: N optical splitters and N Bragg gratings (N is the number of the optical network unit). The network integrally greatly avoids inferences, on quantum signals, of high-light signals to enable the QKD to be capable of coexisting with the GPON or EPON. The optical access passive network supportive of quantum communication can thoroughly improve potential security loopholes of common optical access networks and provides a feasible scheme for popularizing the quantum communication technology to a fiber to house (building) FTTx (fiber to the x) access network.
Description
Technical field
The present invention relates to the Networks of Fiber Communications field, a kind ofly support quantum communications (or being called quantum-key distribution QKD) Fiber to the home (building) (FTTx) EPON architectural schemes, 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 the data safety requirements.
Background technology
Becoming the main way of cable broadband access as the FTTx broadband access network of representative take GPON, EPON technology, but GPON and EPON network have certain potential problem in fail safe: its descending (referring to from the optical line terminal OLT to the optical network unit ONU) data send to all ONU in the mode of broadcasting, in order to prevent that illegal ONU from eavesdropping, must the downlink data of each ONU be encrypted respectively, the safety approach that uses at present is:
Scheme one: OLT utilizes different keys to stir (churning) to the data that send to each ONU and encrypts, and key length is 3 bytes, by the random number that produces of 3 byte OLT with calculate from 3 byte datas that this ONU provides.The data that provide due to ONU are clear-text way, add that key length is shorter, make its fail safe can not satisfy the business of high requirement, do not get rid of the possibility of the equipment that up direction (referring to from ONU to OLT) signal can occur from now on eavesdropping.
Scheme two: use Advanced Encryption Standard (AES) enciphered data to replace stirring and obtain better fail safe.But AES key exchange is generally adopted based on the Diffie-Hellman exchange algorithm of discrete logarithm problem with based on the RSA exchange of public keys algorithm of prime factor resolution problem.Owing to there is no mathematical strict theoretical proof, the fail safe of above-mentioned algorithm just is based upon on empirical basis, might not be reliable.1994, U.S. AT﹠amp; The quantum algorithm that the Peter Shor in T Bell laboratory proposes can be completed in the multinomial step number and find the solution prime factor, and this algorithm coordinates the quantum computer that can may occur from now on, can produce greatly the RSA public key algorithm to threaten.
Along with the large tracts of land laying of optical access network and the growth of business will make these security breaches of processing become more and more thorny, and the cost that thoroughly solves is also more and more huger.Can predict, along with increasing rapidly of internet scale and optical access network userbase, the demand meeting volatile lifting of the coming years to confidentiality business and the raising of data communications security rank, therefore seek a kind of can compatible present FTTx access network framework, and the new network that can integratedly resist the safe practice of new generation of present and following security threat is network research personnel's important research direction, is 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 telecommunication entities more precisely, what this process relied on is the mathematical computations complexity that quantum-mechanical physical law rather than common encryption key distribution rely on, thereby allows Security of the system bring up to a new high.There have been various QKD fiber optic networks verify experimentally and moved, but present these networks are all independent construction (renting separately or lay optical fiber), make its construction cost very expensive, practicality is had a greatly reduced quality, and has also restricted QKD technology popularizing to the commercial market.If utilize the ripe network of laying, can reduce rapidly the QKD network cost, but when quantum signal and high light signal transmit in same optical fiber, (different wave length) can inevitably be subject to the Raman scattering impact of high light, due to the quantum luminous power generally in the rank of-80dBm, lower than the several orders of magnitude of high light power-10dBm, therefore transmitting simultaneously with fibre is impossible substantially.In a word, the transmission problem that is incorporated into the power networks of quantum communications and traditional optical communication network is a difficult problem that needs to be resolved hurrily.
Summary of the invention
The present invention will overcome that prior art EPON access security is poor, quantum communications are communicated by letter with high light and be difficult to the shortcoming of transmission of being incorporated into the power networks, provide solution EPON access security problem and quantum communications to communicate by letter with high light and be incorporated into the power networks and transmitted a kind of passive optical access network scheme framework of a difficult problem, can support quantum communications and GPON, EPON data service in same FTTx access network, thus basic fail safe that can the General Promotion Optical Access Network.
The technical solution adopted for the present invention to solve the technical problems is:
A kind of light access passive network of supporting quantum communications, it is characterized in that: the light access passive network of described support quantum communications QKD comprises N improved optical network unit ONU, 1 improved optical line terminal OLT and 1 improved optical branching device OBD, network using star topology;
Improved optical network unit has 1 optical interface (hybrid interface) and is connected to OBD, its inside comprises and meets ITU-T G.984 line receiver, up reflector under the ethernet passive optical network EPON of the Gigabit Passive Optical Network GPON of standard or IEEE802.3 standard, the quantum-key distribution reflector, wavelength division multiplexer and TDMA control module alternately; Alternately the TDMA control module control upward signal that the QKD reflector produces in good time quantum signal and up reflector after wavelength division multiplexing again with the downstream signal wavelength division multiplexing to the ONU optical interface;
Improved optical line terminal has the high light interface and the quantum interface is connected to OBD, its inside comprises and meets ITU-T G.984 the Gigabit Passive Optical Network GPON of standard or ethernet passive optical network EPON downlink device, the uplink receiving device of IEEE802.3 standard, the quantum-key distribution receiver, wavelength division multiplexer, and QKD Clock Extraction module; Uplink and downlink signals adopts wave division multiplex mode to transfer to the high light interface, and the quantum signal of quantum interface enters the QKD receiver through after narrow band narrow band light filtering, and QKD Clock Extraction module is extracted the detection control that synchronised clock is used for the quantum single-photon detector from upward signal;
Described lower line receiver, up reflector, quantum-key distribution reflector, downlink device, uplink receiving device, quantum-key distribution receiver are by optical module and the electric circuit constitute;
Improved optical splitter has the high light interface and the quantum interface is connected to OLT and N optical interface (hybrid interface) is connected to ONU, its internal structure is that the common optical splitter of 1:N is connected with N optical fiber bragg grating FBG and consists of by 2 branching ratios, and wherein N is the number of optical network unit; Wherein 1 optical splitter close the high light interface that optical port is connected to OBD, N branch port is connected with the common port of N Fiber Bragg Grating FBG respectively; Other 1 optical splitter close the quantum interface that optical port is connected to OBD, N branch port is connected with the filtering port of N Fiber Bragg Grating FBG respectively, the grating wavelength-filtered is the quantum wavelength; The common port of another of N Fiber Bragg Grating FBG is connected to N the hybrid interface of OBD;
Replace the TDMA control module in optical network unit, every two-way optical network unit is carried out static binding, has bound A and B; Alternately TDMA control module in A reads the US BW information of GPON downlink frame PCBd piece or the GRANT information of the descending GATE frame of EPON calculates the up beginning time slot of mandate of B and finishes time slot, as B when sending upstream data, the A control module is controlled QKD reflector traffic volume subsignal, equally, when sending upstream data, the B control module is controlled QKD reflector traffic volume subsignal as A.
Further, the light of described support quantum communications access passive network also comprises:
The dynamic adjusting module of binding relationship in ONU, the US BW information of the GPON downlink frame PCBd piece that upgrades according to the cycle or the GRANT information of the descending GATE frame of EPON are dynamically adjusted the optical network unit binding relationship when upstream data sends next time; Adjustment algorithm is:
Suppose to have N 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, and binding relationship is P_ONU → P_QKD.
Step 1: the 1st time with all ONU according to from small to large arranged sequentially of the ONUID in GPON or the LLID in EPON, obtain ONU and arrange P_ONU (1).ONUID and LLID can obtain from downlink broadcast frame or appointment;
Step 2: according to arranging the QKD in twos adjacent exchange of P_ONU (1) with correspondence, obtain QKD and arrange P_QKD (1).Thereby form the 1st binding relationship P_ONU (1) → P_QKD (1);
Step 3: according to i(i 〉=1) inferior US BW or GRANT information, according to distributing from small to large arranged sequentially of slot length, if distribute slot length identical, little forward of ONUID or LLID obtains QKD pre-arrangement P_QKD ~ (i+1) with QKD;
Step 4: according to the i+1 time US BW or GRANT information, according to distributing from big to small arranged sequentially of slot length, if distribute slot length identical, little forward of ONUID or LLID, obtain ONU and arrange P_ONU (i+1) with ONU;
Step 5: inspection arrangement P_ONU (i+1) and P_QKD ~ (i+1), if there is the ONU of correspondence position identical with QKD, pre-arrangement P_QKD ~ (i+1) is carried out adjacent exchange adjustment, obtain P_QKD (i+1), thereby finally form the i+1 time binding relationship P_ONU (i+1) → P_QKD (i+1);
Step 6: repeating step 3, step 4 and step 5.
Technical conceive of the present invention is: proposed a kind of light access passive network framework of supporting quantum communications, comprised N (natural number) improved optical network unit ONU, 1 improved optical line terminal OLT and 1 improved optical branching device OBD.In network, data uplink and downlink mode is identical with GPON, EPON, and after the by-passing of up quantum signal by alternately time division multiple access access control and OBD, and the high light signal fully isolates, and is not subjected to it to provide key-switch function for downlink data with affecting.
Beneficial effect of the present invention is mainly manifested in: 1, network has greatly been avoided the interference of high light signal to quantum signal on the whole, make QKD and to deposit with GPON or EPON, universal the provide feasible program of Technique on Quantum Communication to Fiber to the home (building) FTTx access network is provided.2, carry out adopting the AES encryption of quantum key due to the downlink broadcast data, therefore can guarantee its fail safe, stopped the possible leak of present GPON, EPON.Data delay and the amount of calculation brought due to the Diffie-Hellman Diffie-Hellman have been reduced simultaneously.
Description of drawings
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
Alternately tdma slot when Fig. 4 is optical network unit of the present invention and QKD static binding distributes schematic diagram
Fig. 5 is that optical network unit of the present invention is counted N=16, the network configuration example during transmission range 20km, and wherein the QKD system has adopted Faraday-Michelson phase interference ring
Fig. 6 is quantum bit error rate QBER simulation value and the corresponding safe key speed R of Fig. 5 profile instance
SECURE
Embodiment
The invention will be further described below in conjunction with accompanying drawing.
A kind of light access passive network of supporting quantum communications, it is characterized in that: the light access passive network of described support quantum communications QKD comprises N improved optical network unit ONU, 1 improved optical line terminal OLT and 1 improved optical branching device OBD, network using star topology;
Improved optical network unit has 1 optical interface (hybrid interface) and is connected to OBD, its inside comprises and meets ITU-T G.984 line receiver, up reflector under the ethernet passive optical network EPON of the Gigabit Passive Optical Network GPON of standard or IEEE802.3 standard, the quantum-key distribution reflector, wavelength division multiplexer and TDMA control module alternately; Alternately the TDMA control module control upward signal that the QKD reflector produces in good time quantum signal and up reflector after wavelength division multiplexing again with the downstream signal wavelength division multiplexing to the ONU optical interface;
Improved optical line terminal has the high light interface and the quantum interface is connected to OBD, its inside comprises and meets ITU-T G.984 the Gigabit Passive Optical Network GPON of standard or ethernet passive optical network EPON downlink device, the uplink receiving device of IEEE802.3 standard, the quantum-key distribution receiver, wavelength division multiplexer, and QKD Clock Extraction module; Uplink and downlink signals adopts wave division multiplex mode to transfer to the high light interface, and the quantum signal of quantum interface enters the QKD receiver through after narrow band narrow band light filtering, and QKD Clock Extraction module is extracted the detection control that synchronised clock is used for the quantum single-photon detector from upward signal;
Described lower line receiver, up reflector, quantum-key distribution reflector, downlink device, uplink receiving device, quantum-key distribution receiver are by optical module and the electric circuit constitute;
Improved optical splitter has the high light interface and the quantum interface is connected to OLT and N optical interface (hybrid interface) is connected to ONU, its internal structure is that the common optical splitter of 1:N is connected with N optical fiber bragg grating FBG and consists of by 2 branching ratios, and wherein N is the number of optical network unit; Wherein 1 optical splitter close the high light interface that optical port is connected to OBD, N branch port is connected with the common port of N Fiber Bragg Grating FBG respectively; Other 1 optical splitter close the quantum interface that optical port is connected to OBD, N branch port is connected with the filtering port of N Fiber Bragg Grating FBG respectively, the grating wavelength-filtered is the quantum wavelength; The common port of another of N Fiber Bragg Grating FBG is connected to N the hybrid interface of OBD;
Replace the TDMA control module in optical network unit, every two-way optical network unit is carried out static binding, has bound A and B; Alternately TDMA control module in A reads the US BW information of GPON downlink frame PCBd piece or the GRANT information of the descending GATE frame of EPON calculates the up beginning time slot of mandate of B and finishes time slot, as B when sending upstream data, the A control module is controlled QKD reflector traffic volume subsignal, equally, when sending upstream data, the B control module is controlled QKD reflector traffic volume subsignal as A.
Further, the light of described support quantum communications access passive network also comprises:
The dynamic adjusting module of binding relationship in ONU, the US BW information of the GPON downlink frame PCBd piece that upgrades according to the cycle or the GRANT information of the descending GATE frame of EPON are dynamically adjusted the optical network unit binding relationship when upstream data sends next time; Adjustment algorithm is:
Suppose to have N 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, and binding relationship is P_ONU → P_QKD.
Step 1: the 1st time with all ONU according to from small to large arranged sequentially of the ONUID in GPON or the LLID in EPON, obtain ONU and arrange P_ONU (1).ONUID and LLID can obtain from downlink broadcast frame or appointment;
Step 2: according to arranging the QKD in twos adjacent exchange of P_ONU (1) with correspondence, obtain QKD and arrange P_QKD (1).Thereby form the 1st binding relationship P_ONU (1) → P_QKD (1);
Step 3: according to i(i 〉=1) inferior US BW or GRANT information, according to distributing from small to large arranged sequentially of slot length, if distribute slot length identical, little forward of ONUID or LLID obtains QKD pre-arrangement P_QKD ~ (i+1) with QKD;
Step 4: according to the i+1 time US BW or GRANT information, according to distributing from big to small arranged sequentially of slot length, if distribute slot length identical, little forward of ONUID or LLID, obtain ONU and arrange P_ONU (i+1) with ONU;
Step 5: inspection arrangement P_ONU (i+1) and P_QKD ~ (i+1), if there is the ONU of correspondence position identical with QKD, pre-arrangement P_QKD ~ (i+1) is carried out adjacent exchange adjustment, obtain P_QKD (i+1), thereby finally form the i+1 time binding relationship P_ONU (i+1) → P_QKD (i+1);
Step 6: repeating step 3, step 4 and step 5.
With reference to Fig. 1, improved optical network unit comprises and meets ITU-T G.984 line receiver (optical module and circuit), up reflector (optical module and circuit) under the ethernet passive optical network EPON of the Gigabit Passive Optical Network GPON of standard or IEEE802.3 standard, quantum-key distribution reflector (optical module and circuit), wavelength division multiplexer and TDMA control module alternately.Alternately the TDMA control module control upward signal that the QKD reflector produces in good time quantum signal and up reflector after wavelength division multiplexing again with the downstream signal wavelength division multiplexing to the ONU optical interface.complete registration that GPON or EPON require and ranging process and complete when front when ONU initially powers on to, the QKD reflector is not worked, after ranging process is completed, alternately the upstream bandwidth of TDMA control module from the downlink frame controll block PCBd of GPON distributes US BW information or read the Grant information of authorizing from the descending GATE frame of EPON, if the ONU of binding has the allocated bandwidth that sends upward signal, control module is controlled the QKD reflector and send the QKD signal in the ascending time slot of correspondence, after multiplexing by 1290/1310 CWDM again through the multiplexing optical fiber that proceeds to OBD of 1310/1490 CWDM.
With reference to Fig. 2, improved optical line terminal comprises and meets ITU-T G.984 the Gigabit Passive Optical Network GPON of standard or ethernet passive optical network EPON downlink device (optical module and circuit), the uplink receiving device (optical module and circuit) of IEEE802.3 standard, 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 the wave division multiplex mode transmission, and the quantum signal of quantum interface enters the QKD receiver after through arrowband (50GHz) light filtering, and QKD Clock Extraction module is extracted the detection that synchronised clock is used for the quantum single-photon detector and controlled from upward signal.
With reference to Fig. 3, improved optical splitter, its internal structure is that the common optical splitter of 1:N is connected with N optical fiber bragg grating FBG and consists of by 2 branching ratios, wherein N is the number of optical network unit.Wherein 1 optical splitter close the high light interface that optical port is connected to OBD, N branch port is connected with the common port of N Fiber Bragg Grating FBG respectively; Other 1 optical splitter close the quantum port that optical port is connected to OBD, N branch port is connected with the filtering port of N Fiber Bragg Grating FBG respectively, the grating wavelength-filtered is the quantum wavelength.The common port of another of N Fiber Bragg Grating FBG is connected to N the hybrid interface of OBD.
With reference to Fig. 4, every two-way optical network unit is carried out binding, when wherein one road optical network unit is at the transmission upstream data, and other one road optical network unit traffic volume subsignal, 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 arrival OBD, finally enter the quantum end of probe of OLT, thereby realize ONU
2The QKD function; Equally, work as ONU
2When sending upstream data, ONU
1Start the QKD function.By that analogy.Can allow all ONU not realize the QKD function according to OLT to the precision ranging process of ONU and appropriate signaling control with not conflicting mutually.In actual conditions binding relationship can according to the situation of upstream bandwidth carry out dynamically adjusting make that all ONU can be comparatively average carry out QKD communication.
With reference to Fig. 5, take the EPON of 1:16 branching ratio as example, ONU comprises and meets the up reflector (optical module and circuit) that 1000BASE-PX20-U requires, line code NRZ, speed 1.25Gbps, λ
UPTREAM=1310nm; Meet the lower line receiver (optical module and circuit) that 1000BASE-PX20-D requires, line speed 1.25Gbps, λ
DOWNSTREAM=1490nm; λ
QKD=1290nm, the FPGA controller is responsible for producing pseudo random sequence string (speed 1.25GHz), and the GRANT information that reads descending GATE frame is controlled the continuous light that the QKD continuous wave laser produces 1290nm when the ONU ascending time slot of binding begins, modulation produces the RZ pulse through MZ, enter the CWDM multiplexer through FM interference ring phase code and after decaying again, and finally enter to OBD optical fiber.Enter the quantum interface of OLT through QKD signal after the shunt function of OBD.In OLT, the QKD receiving system adopts BB84 agreement (two single-photon detector SPD), and the QKD signal first filtered through narrow-band optical filter before entering the FM interference ring.The FPGA controller is responsible for receiving the result of detection of single-photon detector, and realizes the Clock Extraction function of upward signal, to control opening the door the time of SPD.The FPGA process generates final safe key after basic and the amplification etc. of maintaining secrecy are operated, offer respectively downlink device and lower line receiver, the AES cryptographic algorithm that makes it 256 keys of employing cycle renewal is encrypted downlink data, thereby guarantees the fail safe of downlink data.
With reference to Fig. 6, the CWDM insertion loss of actual measurement 1290/1310,1310/1490 is 1dB, the G.652 monomode fiber loss 8dB(1290/1310nm of 20km), 5dB(1490nm), FBG insertion loss 1dB, 1:16 optical splitter loss 12dB, the uplink total losses are 24dB, the downgoing line total losses are 20dB, satisfy the maximum 24dB power budget of 20km scope that in EPON, 1000BASE-PX20 requires, therefore can satisfy the requirement of EPON transmission circuit system, the error rate is less than 10
-10The loss of FM interference ring is 3dB, optical filter insertion loss 1dB, the quantum wire total losses are the 28dB left and right, 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 safe key speed of Fig. 6 (b) is the 2kbps left and right, this secret-key rate can support each ONU to upgrade the AES key of 256 in average every 2 seconds 1 time, more rapidly than the Diffie-Hellman exchange algorithm that adopts at present, be used for the data service demand for security that the downlink data stream encryption can satisfy the overwhelming majority.
The present invention has designed a kind of passive optical access network network framework that can support quantum-key distribution, can realize recruitment sub-key distribution function in GPON, EPON transfer of data, GPON than before, EPON network have more fail safe, can realize in Optical Access Network encrypted physical function descending, upstream data, for the development of following secure data business provides a kind of important assurance.
Claims (2)
1. support the light of quantum communications to access passive network for one kind, it is characterized in that: the light access passive network of described support quantum communications QKD comprises N improved optical network unit ONU, 1 improved optical line terminal OLT and 1 improved optical branching device OBD, network using star topology;
Improved optical network unit has 1 optical interface (hybrid interface) and is connected to OBD, its inside comprises and meets ITU-T G.984 line receiver, up reflector under the ethernet passive optical network EPON of the Gigabit Passive Optical Network GPON of standard or IEEE802.3 standard, the quantum-key distribution reflector, wavelength division multiplexer and TDMA control module alternately; Alternately the TDMA control module control upward signal that the QKD reflector produces in good time quantum signal and up reflector after wavelength division multiplexing again with the downstream signal wavelength division multiplexing to the ONU optical interface;
Improved optical line terminal has the high light interface and the quantum interface is connected to OBD, its inside comprises and meets ITU-T G.984 the Gigabit Passive Optical Network GPON of standard or ethernet passive optical network EPON downlink device, the uplink receiving device of IEEE802.3 standard, the quantum-key distribution receiver, wavelength division multiplexer, and QKD Clock Extraction module; Uplink and downlink signals adopts wave division multiplex mode to transfer to the high light interface, and the quantum signal of quantum interface enters the QKD receiver through after narrow band narrow band light filtering, and QKD Clock Extraction module is extracted the detection control that synchronised clock is used for the quantum single-photon detector from upward signal;
Described lower line receiver, up reflector, quantum-key distribution reflector, downlink device, uplink receiving device, quantum-key distribution receiver are by optical module and the electric circuit constitute;
Improved optical splitter has the high light interface and the quantum interface is connected to OLT and N optical interface (hybrid interface) is connected to ONU, its internal structure is that the common optical splitter of 1:N is connected with N optical fiber bragg grating FBG and consists of by 2 branching ratios, and wherein N is the number of optical network unit; Wherein 1 optical splitter close the high light interface that optical port is connected to OBD, N branch port is connected with the common port of N Fiber Bragg Grating FBG respectively; Other 1 optical splitter close the quantum interface that optical port is connected to OBD, N branch port is connected with the filtering port of N Fiber Bragg Grating FBG respectively, the grating wavelength-filtered is the quantum wavelength; The common port of another of N Fiber Bragg Grating FBG is connected to N the hybrid interface of OBD;
Replace the TDMA control module in optical network unit, every two-way optical network unit is carried out static binding, has bound A and B; Alternately TDMA control module in A reads the US BW information of GPON downlink frame PCBd piece or the GRANT information of the descending GATE frame of EPON calculates the up beginning time slot of mandate of B and finishes time slot, as B when sending upstream data, the A control module is controlled QKD reflector traffic volume subsignal, equally, when sending upstream data, the B control module is controlled QKD reflector traffic volume subsignal as A.
2. the light of support quantum communications as claimed in claim 1 accesses passive network, it is characterized in that: the light access passive network of described support quantum communications also comprises:
The dynamic adjusting module of binding relationship in ONU, the US BW information of the GPON downlink frame PCBd piece that upgrades according to the cycle or the GRANT information of the descending GATE frame of EPON are dynamically adjusted the optical network unit binding relationship when upstream data sends next time; Adjustment algorithm is:
Suppose to have N 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, and binding relationship is P_ONU → P_QKD.
Step 1: the 1st time with all ONU according to from small to large arranged sequentially of the ONUID in GPON or the LLID in EPON, obtain ONU and arrange P_ONU (1).ONUID and LLID can obtain from downlink broadcast frame or appointment;
Step 2: according to arranging the QKD in twos adjacent exchange of P_ONU (1) with correspondence, obtain QKD and arrange P_QKD (1).Thereby form the 1st binding relationship P_ONU (1) → P_QKD (1);
Step 3: according to i(i 〉=1) inferior US BW or GRANT information, according to distributing from small to large arranged sequentially of slot length, if distribute slot length identical, little forward of ONUID or LLID obtains QKD pre-arrangement P_QKD ~ (i+1) with QKD;
Step 4: according to the i+1 time US BW or GRANT information, according to distributing from big to small arranged sequentially of slot length, if distribute slot length identical, little forward of ONUID or LLID, obtain ONU and arrange P_ONU (i+1) with ONU;
Step 5: inspection arrangement P_ONU (i+1) and P_QKD ~ (i+1), if there is the ONU of correspondence position identical with QKD, pre-arrangement P_QKD ~ (i+1) is carried out adjacent exchange adjustment, obtain P_QKD (i+1), thereby finally form the i+1 time binding relationship P_ONU (i+1) → P_QKD (i+1);
Step 6: repeating step 3, step 4 and step 5.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103327422A (en) * | 2013-05-27 | 2013-09-25 | 浙江工业大学 | Low-cost passive optical network for video monitoring |
| CN104518867A (en) * | 2013-09-28 | 2015-04-15 | 安徽量子通信技术有限公司 | Method for resisting wavelength attack in quantum key distribution system |
| CN104518868A (en) * | 2013-09-28 | 2015-04-15 | 安徽量子通信技术有限公司 | QKD (quantum key distribution) system capable of resisting wavelength attack |
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