Optical access passive network supportive of quantum communication

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 [0001] The invention relates to the field of optical fiber communication networks, a fiber-to-the-home (building) (FTTx) passive optical network architecture scheme supporting quantum communication (or called quantum key distribution QKD), which is suitable for supporting Gigabit passive optical network (GPON) ) or Ethernet Passive Optical Network (EPON) data transmission, and FTTx access network with high data security requirements. Background technique [0002] The FTTx broadband access network represented by GPON and EPON technology is becoming the mainstream way of wired broadband access, but both GPON and EPON networks have certain potential problems in terms of security: their downlink (from the optical line terminal OLT to Optical Network Unit (ONU) data is sent to all ONUs by broadcast. In order to prevent illegal ONUs from eavesdropping, the downlink data of each ONU must be encrypted separately. The security scheme currently used is: [0003] Schem...

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Problems solved by technology

[0007] The present invention overcomes the disadvantages of poor security of passive optical network access in the prior art and difficulty in grid-connected transmission of quantum communication and strong optical communication, and provides solutions to the security problems of passive optical network access and the grid-connected transmission of quantum communication and strong optical communication A passive optical access network solution architecture that is difficult to solve, can support quantum communication and GPON, EPON data services in the same FTTx access network, so as to comprehensively improve the basic security of the optical access network

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