摘要
为减小轨道角动量(OAM)复用信号在自由空间传输过程中的模式间串扰,提出一种串扰消除方案。在传输基于16进制正交幅相调制的正交频分复用(16QAM-OFDM)信号的双路OAM复用自由空间光通信链路中,使用基于梯度下降的线性回归方案缓解OAM模式间串扰,恢复原始信号。实验结果表明:该串扰消除方案使接收到的双路16QAM-OFDM信号的星座点集中在16QAM参考点周围,且每个子载波的误码率(BER)接近于没有串扰时的BER;当串扰功率约为-23.5dBm时,前向纠错码(FEC)门限3.8×10-3处的功率代价至少降低了3d B。
In order to reduce the modal crosstalk of orbital angular momentum(OAM) multiplexed signals in free space, this paper proposes a crosstalk mitigation scheme. It uses the gradient descent based linear regression in 16 quadrature amplitude modulation orthogonal frequency division multiplexing(16QAM-OFDM) carrying dual-channel OAM multiplexed FSO communication links. The scheme can mitigate crosstalk between OAM modes and recover the original signal. The experimental results show that the proposed scheme concentrates the constellation points of the received dual 16QAM-OFDM signals around the 16QAM reference point, and the bit error rate(BER) of each subcarrier is close to the BER without crosstalk. The power penalty at the forward error correction (FEC) threshold of 3.8×10^-3 is reduced by 3dB when the crosstalk power is -23.5dBm.
作者
刘旻雯
李迎春
LIU Minwen;LI Yingchun(Key laboratory of Specialty Fiber Optics and Optical Access Networks, Shanghai University, Shanghai 200444, China;Joint International Research Laboratory of Specialty Fiber Optics and Advanced Communication, Shanghai University,Shanghai 200444, China;Shanghai Institute for Advanced Communication and Data Science,Shanghai University, Shanghai 200444, China)
出处
《光通信技术》
北大核心
2019年第1期5-9,共5页
Optical Communication Technology
基金
国家自然科学基金(批准号:61601279
61601277
61420106011
61635006)资助
上海市科学发展基金(批准号:17010500400
16511104100
18511103400
15530500600
16YF1403900)资助
