利用数字正交滤波降低IM-DD模分复用传输中的信号串扰

陈健; 王芳; 李正璇; 富惠雯

doi:doi:10.3788/AOS201939.0806005

光学学报, 2019, 39 (8): 0806005, 网络出版: 2019-08-07

利用数字正交滤波降低IM-DD模分复用传输中的信号串扰下载： 1097次

Reducing Signal Crosstalk in IM-DD-Mode-Division Multiplexing Transmission via Digital Orthogonal Filtering

陈健 ^1,2王芳 ^1,2李正璇 ^1,2,*富惠雯 ^1,2

作者单位

¹ 上海先进通信与数据科学研究院, 上海 200444

² 上海大学特种光纤与光接入网重点实验室, 上海 200444

图 & 表

图 1. 使用数字正交滤波的信道复用

Fig. 1. Channel multiplexing using digital orthogonal filtering

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图 2. LP11模的模场分布图。(a)仅使用LP11a模;(b)仅使用LP11b模;(c)同时使用LP11a模和LP11b模

Fig. 2. Field distributions of LP11 mode. (a) Only use LP11a mode; (b) only use LP11b mode; (c) use both LP11a mode and LP11b mode

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图 3. IM-DD模分复用系统PAM信号传输实验框图

Fig. 3. Experimental structure of PAM signal transmission in IM-DD mode division multiplexing system

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图 4. 测试信号的产生与离线检测的流程图。(a)调制和组帧;(b)解调和译码

Fig. 4. Diagrams of test signal generation and offline detection. (a) Modulating and framing; (b) demodulating and decoding

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图 5. 发送端使用的正交滤波器。(a)发送端I路滤波器的频率响应;(b)发送端I路滤波器的时域波形;(c) 发送端Q路滤波器的频率响应;(d)发送端Q路滤波器的时域波形

Fig. 5. Orthogonal filter used by the transmitter. (a) Transmitter I path filter frequency response; (b) transmitter I path filter time domain waveform; (c) transmitter Q path filter frequency response; (d) transmitter Q path filter time domain waveform

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图 6. 接收端I路和Q路信号波形图

Fig. 6. Signal waveforms of I path and Q path of receiver

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图 7. PAM8信号经过LP11a-LP11a信道背靠背/500 m少模光纤单路传输无串扰时的BER曲线

Fig. 7. BER curves of PAM8 signal through LP11a-LP11a channel back-to-back/500 m FMF transmission without crosstalk

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图 8. PAM8信号经过LP11a-LP11a信道背靠背/500 m少模光纤传输有串扰时的BER曲线

Fig. 8. BER curves of PAM8 signal through LP11a-LP11a channel back-to-back/500 m FMF transmission with crosstalk

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图 9. 背靠背传输PAM8信号时使用数字正交滤波结合LS算法解调后的BER曲线

Fig. 9. BER curves of PAM8 signal through back-to-back transmission with digital orthogonal filtering and LS algorithm

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图 10. 经过500 m FMF传输PAM8信号时使用数字正交滤波结合LS算法解调后的BER曲线

Fig. 10. BER curves of PAM8 signal after 500 m FMF transmission with digital orthogonal filtering and LS algorithm

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图 11. 背靠背传输PAM8信号时使用数字正交滤波结合LS算法经过迭代后解调的BER曲线

Fig. 11. BER curves of PAM8 signal through back-to-back transmission after iteration by digital orthogonal filtering and LS algorithm

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表 1光子灯笼LP11a模和LP11b模的插入损耗

Table1. Insertion losses of LP11a and LP11b modes in photonic lantern

Input port	Output port	Back-to-Back /dB	Over 500 m FMF /dB
LP_11a port	LP_11a port	5.9	5.96
LP_11a port	LP_11b port	5.3	6.47
LP_11b port	LP_11aport	4.5	5.65
LP_11b port	LP_11b port	5.5	7

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表 2实验系统参数

Table2. Parameters of experimental system

Parameter	Value	Parameter	Value
Modulation format	8PAM	PIN detector bandwidth /GHz	1.5
Training sequence length	90 symbols	Laser wavelength /nm	1551.182/1550.188
DFB driving voltage	2.1 V_pp	Laser bandwidth /GHz	1.4
FMF length /m	back-to-back/500	AWG sampling rate /(GSa·s^-1)	2
Amp /dB	10	DSO sampling rate /(GSa·s^-1)	20
Note: V_pp is peak-to-peak value of received signal amplitude

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陈健, 王芳, 李正璇, 富惠雯. 利用数字正交滤波降低IM-DD模分复用传输中的信号串扰[J]. 光学学报, 2019, 39(8): 0806005. Jian Chen, Fang Wang, Zhengxuan Li, Huiwen Fu. Reducing Signal Crosstalk in IM-DD-Mode-Division Multiplexing Transmission via Digital Orthogonal Filtering[J]. Acta Optica Sinica, 2019, 39(8): 0806005.

利用数字正交滤波降低IM-DD模分复用传输中的信号串扰下载： 1097次

图 1. 使用数字正交滤波的信道复用

Fig. 1. Channel multiplexing using digital orthogonal filtering

图 2. LP11模的模场分布图。(a)仅使用LP11a模;(b)仅使用LP11b模;(c)同时使用LP11a模和LP11b模

Fig. 2. Field distributions of LP11 mode. (a) Only use LP11a mode; (b) only use LP11b mode; (c) use both LP11a mode and LP11b mode

图 3. IM-DD模分复用系统PAM信号传输实验框图

Fig. 3. Experimental structure of PAM signal transmission in IM-DD mode division multiplexing system

图 4. 测试信号的产生与离线检测的流程图。(a)调制和组帧;(b)解调和译码

Fig. 4. Diagrams of test signal generation and offline detection. (a) Modulating and framing; (b) demodulating and decoding

图 5. 发送端使用的正交滤波器。(a)发送端I路滤波器的频率响应;(b)发送端I路滤波器的时域波形;(c) 发送端Q路滤波器的频率响应;(d)发送端Q路滤波器的时域波形

Fig. 5. Orthogonal filter used by the transmitter. (a) Transmitter I path filter frequency response; (b) transmitter I path filter time domain waveform; (c) transmitter Q path filter frequency response; (d) transmitter Q path filter time domain waveform

图 6. 接收端I路和Q路信号波形图

Fig. 6. Signal waveforms of I path and Q path of receiver

图 7. PAM8信号经过LP11a-LP11a信道背靠背/500 m少模光纤单路传输无串扰时的BER曲线

Fig. 7. BER curves of PAM8 signal through LP11a-LP11a channel back-to-back/500 m FMF transmission without crosstalk

图 8. PAM8信号经过LP11a-LP11a信道背靠背/500 m少模光纤传输有串扰时的BER曲线

Fig. 8. BER curves of PAM8 signal through LP11a-LP11a channel back-to-back/500 m FMF transmission with crosstalk

图 9. 背靠背传输PAM8信号时使用数字正交滤波结合LS算法解调后的BER曲线

Fig. 9. BER curves of PAM8 signal through back-to-back transmission with digital orthogonal filtering and LS algorithm

图 10. 经过500 m FMF传输PAM8信号时使用数字正交滤波结合LS算法解调后的BER曲线

Fig. 10. BER curves of PAM8 signal after 500 m FMF transmission with digital orthogonal filtering and LS algorithm

图 11. 背靠背传输PAM8信号时使用数字正交滤波结合LS算法经过迭代后解调的BER曲线

Fig. 11. BER curves of PAM8 signal through back-to-back transmission after iteration by digital orthogonal filtering and LS algorithm

表 1光子灯笼LP11a模和LP11b模的插入损耗

Table1. Insertion losses of LP11a and LP11b modes in photonic lantern

表 2实验系统参数

Table2. Parameters of experimental system

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图 1. 使用数字正交滤波的信道复用

Fig. 1. Channel multiplexing using digital orthogonal filtering

图 2. LP11模的模场分布图。(a)仅使用LP11a模;(b)仅使用LP11b模;(c)同时使用LP11a模和LP11b模

Fig. 2. Field distributions of LP11 mode. (a) Only use LP11a mode; (b) only use LP11b mode; (c) use both LP11a mode and LP11b mode

图 3. IM-DD模分复用系统PAM信号传输实验框图

Fig. 3. Experimental structure of PAM signal transmission in IM-DD mode division multiplexing system

图 4. 测试信号的产生与离线检测的流程图。(a)调制和组帧;(b)解调和译码

Fig. 4. Diagrams of test signal generation and offline detection. (a) Modulating and framing; (b) demodulating and decoding

图 5. 发送端使用的正交滤波器。(a)发送端I路滤波器的频率响应;(b)发送端I路滤波器的时域波形;(c) 发送端Q路滤波器的频率响应;(d)发送端Q路滤波器的时域波形

Fig. 5. Orthogonal filter used by the transmitter. (a) Transmitter I path filter frequency response; (b) transmitter I path filter time domain waveform; (c) transmitter Q path filter frequency response; (d) transmitter Q path filter time domain waveform

图 6. 接收端I路和Q路信号波形图

Fig. 6. Signal waveforms of I path and Q path of receiver

图 7. PAM8信号经过LP11a-LP11a信道背靠背/500 m少模光纤单路传输无串扰时的BER曲线

Fig. 7. BER curves of PAM8 signal through LP11a-LP11a channel back-to-back/500 m FMF transmission without crosstalk

图 8. PAM8信号经过LP11a-LP11a信道背靠背/500 m少模光纤传输有串扰时的BER曲线

Fig. 8. BER curves of PAM8 signal through LP11a-LP11a channel back-to-back/500 m FMF transmission with crosstalk

图 9. 背靠背传输PAM8信号时使用数字正交滤波结合LS算法解调后的BER曲线

Fig. 9. BER curves of PAM8 signal through back-to-back transmission with digital orthogonal filtering and LS algorithm

图 10. 经过500 m FMF传输PAM8信号时使用数字正交滤波结合LS算法解调后的BER曲线

Fig. 10. BER curves of PAM8 signal after 500 m FMF transmission with digital orthogonal filtering and LS algorithm

图 11. 背靠背传输PAM8信号时使用数字正交滤波结合LS算法经过迭代后解调的BER曲线

Fig. 11. BER curves of PAM8 signal through back-to-back transmission after iteration by digital orthogonal filtering and LS algorithm

表 1光子灯笼LP11a模和LP11b模的插入损耗

Table1. Insertion losses of LP11a and LP11b modes in photonic lantern

表 2实验系统参数

Table2. Parameters of experimental system

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