基于预编码的模群复用信号串扰抵消技术  

Crosstalk Mitigation Technology in Mode Group Division Multiplexing Transmission Based on Precoding

作　　者：富惠雯 朱子岳 陈健[1,2] Fu Huiwen;Zhu Ziyue;Chen Jian(Key Laboratory of Specialty Fiber Optics and Optical Access Networks,Shanghai University,Shanghai 200444,China;Joint Intermational Research Laboratory of Specialty Fiber Optics and Adranced Communication,Shanghai University,Shanghai 200444,China)

机构地区：[1]上海大学特种光纤与光接入网重点实验室,上海200444 [2]上海大学特种光纤与先进通信国际合作联合实验室,上海200444

出　　处：《光学学报》2021年第6期47-53,共7页Acta Optica Sinica

摘　　要：在基于光子灯笼强度调制直接检测(IM-DD)的模群复用传输系统中,提出一种用于降低信号串扰的基于单端信道估计的预编码方案。该方案使用环形器和分路器作为信号返回机制,将信号返回到发送端进行发送端单端信道估计,然后将得到的信道传递矩阵用于预编码。实验结果表明,经所提预编码方案的处理,在背靠背及连接500 m少模光纤的模群复用传输系统中,信号误码率(BER)在1.3×10^(-2)前向纠错(FEC)门限时,LP01-LP01和LP11a-LP11b信道的信号发送功率分别降低了约3 dB和1 dB。本研究为解决点到多点的IM-DD模群复用传输系统中的信号串扰问题提供了一种有效的方案。A precoding scheme based on single-end channel estimation is proposed to mitigate crosstalk in received signals in intensity modulation direct detection(IM-DD) mode group division multiplexing transmission system based on photonic lantern. The scheme uses a signal feedback mechanism which is made up of a circulator and a splitter. Signals in receiving ends will return to the transmitting end for single-end channel estimation and the channel transmitting matrix will be used for precoding. The experimental results show that after the precoding processing in the back-to-back and 500-m few mode fiber mode group division multiplexing transmission systems, the transmitted power of LP01--LP01 and LP11 a--LP11 b channel signals can be reduced about 3 dB and 1 dB respectively when the bit error ratio(BER) is at the threshold of 1.3×10^(-2) forward error correction(FEC). This paper provides an effective solution to reduce signal crosstalk in point-to-multipoint IM-DD mode group multiplexing transmission.

关 键 词：光通信 模群复用 信号串扰 单端信道估计 预编码 

分 类 号：TN915.62[电子电信—通信与信息系统]