【摘要】 将物理层网络编码引入光网络中,研究了在3Gb/s的传输速率下基于差分相移键控(DPSK)调制的物理层网络安全编码的光网络。将两路同频信号通过光纤传输到中继,在中继处混合在一起后同时再通过光纤传给两个用户,在接收端将混合信号通过解码出来得到两个用户信号比特的异或,最后通过与其中一个用户的信息进行异或就可以得到另一个用户的信息。由于两路信号为同频信号,混合后必会发生干涉,利用DPSK将两路信号占空比分别调制为33%与67%,解决了信号混合后的干涉问题。由于在中继处两个信号混合后,发出的是两个用户的混合信号,具有一次一密效果,在利用物理层网络编码提高网络的吞吐量的同时,也增加了从中继到用户的链路的安全性。更多还原

【Abstract】 In this paper, physical layer network coding was introduced into optical network, and the optical network based on differential phase shift keying(DPSK) modulation was studied under the transmission rate of 3 Gb/s. Two signals of the same frequency were transmitted to the relay through the optical fiber. After mixing together at the relay, they were transmitted to two users through the optical fiber at the same time. At the receiving end, the mixed signals were decoded to get the XOR of two user signal bits. Finally, another user can be obtained by XOR with the information of one user. Because the two signals are of the same frequency, interference will occur after mixing. In this paper, DPSK was used to modulate the duty cycle of the two signals to 33% and 67% respectively, which solves the interference problem after signal mixing. While using physical layer network coding to improve network throughput, the mixed signals of two users were emitted because the two signals at the relay were mixed, which has the effect of one-time encryption and increases the security of the link from the relay to the user.更多还原