OOFDM (Optical Orthogonal Frequency Division Multiplexing) encryption system based on chaos sequence pilot frequency mapping

Abstract

The invention discloses an OOFDM (Optical Orthogonal Frequency Division Multiplexing) encryption system based on chaos sequence pilot frequency mapping; the OOFDM encryption system comprises an OFDM (Orthogonal Frequency Division Multiplexing) encryption module, an optical modulation module, an optical fiber transmission channel, a photoelectric detection module and an OFDM decryption module, wherein the OFDM encryption module, the optical modulation module, the optical fiber transmission channel, the photoelectric detection module and the OFDM decryption module are successively connected; the OFDM encryption module is connected to the optical modulation module, thereby generating an encrypted OOFDM signal; the encrypted OOFDM signal is connected to the optical fiber transmission channel, realizing the transmission of the encrypted OOFDM signal in optical fibers; the optical fiber transmission channel transmits the encrypted OOFDM signal to the photoelectric detection module, thereby converting the encrypted OOFDM signal into an electrical OFDM signal; and the electrical OFDM signal reaches to the OFDM decryption module, finishing the demodulation of the OFDM signal. The OOFDM encryption system disclosed by the invention can be adaptive to transmission characteristics of high speed and large capacity of an optical frequency division multiplexing transmission system, the safety is high and the time-space cost is low; under the condition of not occupying and not changing the original signal distribution, the system encryption can be realized, and the realizability is high.

Description

technical field [0001] The invention belongs to the technical field of optical communication encryption, and mainly relates to the encryption application of a chaotic sequence in an optical orthogonal frequency division multiplexing transmission system. Background technique [0002] Optical Orthogonal Frequency Division Multiplexing (OOFDM) is a new technology that applies OFDM technology to optical communication, and can construct a high-speed, large-capacity, and low-cost optical transmission network. OOFDM can effectively combat intersymbol interference (ISI) caused by chromaticity, dispersion and polarization mode dispersion in optical communication systems, and the introduction of cyclic prefix (CP) further enhances the dispersion resistance of OOFDM communication systems and reduces dispersion The complexity of management also plays an important role in improving the data transmission rate and system capacity. In addition, the different frequency spectrums of each sub...

AI Technical Summary

Problems solved by technology

However, in the actual implementation of effective and fast OOFDM system encryption, there are the following problems that need to be solved urgently: first, the security is high, and illegal receivers cannot decrypt the original signal; Dispersion, loss and other problems caused by the final signal; moreover, the speed of signal processing by chaotic sequence is the speed of encryption and decryption.

However, in the test of the illegal receiver, it is found that even if all the masking vectors are wrong, the bit error rate generated in the test is only about 0.5, which cannot meet the system requirements of high security

Images