Classified passive optical network based on synchronization of chaos
A passive optical network and chaotic synchronization technology, applied in optical fiber transmission, multiplexing system selection device, digital transmission system, etc., can solve complex scrambling and descrambling calculations, few physical layer security research problems, etc. , to achieve the effect of enhancing information confidentiality, simple structure and strong practicability
Inactive Publication Date: 2013-08-21
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology
In the current application and research, people mainly improve the security of the optical network by enhancing the security of the media access control layer, but there is little research on the security of the physical layer which is most vulnerable
Related studies have proposed to use discrete chaotic signals to scramble the subcarriers of OFDM to improve the confidentiality of OFDM passive optical networks, but require complex scrambling and descrambling calculations
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[0033] The implementation of the present invention will be further described below in conjunction with the accompanying drawings.
[0034] Such as figure 1 As shown, the system of the present invention consists of n semiconductor lasers TL1-RL1, TL2-RL2, ..., TLn-RLn with the same wavelength, an external optical modulator MOD, an optical wavelength division multiplexer WDM, an optical fiber, a photodetector PD, and an inverting It consists of photodetector IPD, optocoupler OC, optical isolator OI, optical circulator, delay line DL, low pass filter LPF and so on.
[0035] exist figure 1 In this method, the broadband chaotic optical carrier can be easily obtained by properly adjusting the external cavity length or the feedback intensity of each laser at the OLT end. Each OLT sending module directly encrypts the downlink information into the chaotic carrier through the optical modulator, and after being combined by the wavelength division multiplexer, it is transmitted to the O...
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The invention discloses a classified passive optical network based on synchronization of chaos, and belongs to the technical field of classified optical communication. N pairs of semiconductor lasers with the same operating wavelength are adopted at two ends of an OLT and two ends of an optical network unit to serve as a chaotic carrier wave generator. Uplink information and downlink information are respectively loaded to n chaotic carrier waves with different wavelengths through an optical modulator to achieve information chaotic encryption, up-load and down-load are carried out through optical fibers after combination by adopting a wavelength-division multiplexing technology, and at last information decryption is achieved by adopting a chaotic carrier wave with the same wavelength. An all-optical chaotic signal is used as a carrier wave and combined with the wavelength-division multiplexing technology to carry out classified transmission on uplink information and downlink information, information security of the passive optical network is improved from a physical layer, the classified passive optical network based on synchronization of the chaos is suitable for a communication service with high requirements in information confidentiality, and reference significance is provided to improve safety of the passive optical network.
Description
technical field [0001] The invention relates to the fields of optical communication, chaos and semiconductor lasers, in particular to a chaotic synchronization-based secret passive optical network, which is suitable for the field of broadband secret optical access network. technical background [0002] Chaotic signals have unique security characteristics, which can hide information well, so they are very popular in the field of secure communication. Under the conditions of external feedback and injection, semiconductor lasers can generate tens of GHz broadband chaotic optical signals. Therefore, chaotic synchronous communication based on semiconductor lasers has become a bright spot in the field of secure optical communications. As the preferred technology for broadband optical access, passive optical network has broad practical application prospects. At present, relevant researches have proposed wavelength division multiplexing passive optical network, orthogonal frequency...
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IPC IPC(8): H04Q11/00H04B10/25H04L9/00
Inventor 江宁邱昆
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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