A large key space chaotic optical communication transceiver

Abstract

The present invention is a chaotic optical communication transceiver with a large key space, which belongs to the technical field of secure optical communication; the key space is increased by increasing the number of external cavities, the structure is complex, and it is susceptible to environmental interference, and the pseudo-random code modulation increases the key space and cannot play chaos The unique hardware encryption advantage of secure communication increases the complexity of the feedback loop and increases the key space, which is expensive and inconvenient for integration and large-scale production; the present invention provides a chaotic optical communication transceiver with a large key space, and the key space is DFB semiconductor The laser feedback intensity, driving current and key parameters of the random filter module are combined. The random filter module replaces the traditional feedback mirror to realize the random selection function after the optical path range is encoded to the spectrum, which greatly improves the key space of the chaotic optical communication transceiver and meets the legal requirements. The confidential communication of users increases the difficulty of stealing by illegal users, effectively hides delay characteristics, ensures hardware consistency, facilitates chaotic synchronization, and facilitates large-scale production.

Description

technical field [0001] The invention relates to the technical field of secure optical communication, in particular to a large key space chaotic optical communication transceiver. Background technique [0002] Chaos optical communication has the advantages of hardware encryption, compatibility with existing optical communication systems, and suitability for high-speed (Gbit / s) and long-distance (km) secure communications, which has attracted extensive attention. The key of chaotic optical secure communication lies in the chaotic synchronization between the chaotic laser receiver and the transmitter, which requires the structural parameters of the receiver and the transmitter to be completely matched or within a certain parameter mismatch range (Phys. Rev. E, Vol. 69, P.056226, 2004). For legitimate communication parties, the hardware structure parameters of the transceiver are usually used as the key. The larger the key space composed of key parameters, the longer it takes ...

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Problems solved by technology

However, the increase in the number of external cavities makes the spatial structure of the chaotic communication transceiver more complex, susceptible to environmental interference, and the robustness of communication is reduced, and parameters such as feedback strength, external cavity length, and bias current can only be selected in certain specific ranges. In order to hide the length information of the external cavity, this actually limits its effective parameter key space; the second is to increase the key space by modulating the length of the feedback cavity with a pseudo-random code, and use the preset pseudo-random code sequence as Private key to modulate the cavity length or phase information of the external cavity feedback laser (Phys. Rev. Lett., Vol. 107, P.1-4, 2011; IEEE Photon. Technol. Lett., Vol. 27, P.326- 329, 2015)

However, for an external cavity semiconductor laser with a simple structure, its security depends on the private key rather than the physical parameters of the device, and it cannot take advantage of the hardware encryption unique to chaotic secure communication; the third is to increase the key by increasing the complexity of the feedback loop Space, embedding tunable optoelectronic devices in the feedback loop, increasing the number of devices to control the chaotic state (Opt. Express, Vol. 24, P.23439-23449, 2016)

However, the method of increasing the key space by increasing the complexity of inserting devices is expensive, inconvenient for integration and large-scale production, it is difficult to guarantee hardware consistency, and it is difficult for legal communication parties to achieve chaotic synchronization

[0005] In summary, in the existing schemes for increasing the key space of the transceiver, the key space is increased by increasing the number of external cavities, the structure is complex, and it is easily disturbed by the environment, and the delay information can only be hidden in the effective interval; the pseudo-random code modulation is used to enhance the key space. The key space, whose security depends on the private key rather than the physical parameters of the device, cannot take advantage of the unique hardware encryption of chaotic secure communication; increasing the key space by increasing the complexity of the feedback loop is expensive and inconvenient for integration and scale It is difficult to guarantee the consistency of hardware, and it is difficult for both legal communication parties to realize chaos synchronization

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