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基于啁啾管理激光器的直接调制RZ-DPSK信号产生技术研究
Direct Modulation RZ-DPSK Signal Generation Technology Based on Chirp-Managed Lasers

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马榕 1,2,3   高铎瑞 1,2,3 *   魏森涛 1,2   谢壮 1,2,3   汪伟 1,2   郏帅威 1,2,3   白兆峰 1,2   谢小平 1,2,3 *  
文摘 利用啁啾管理激光器的啁啾效应实现了光信号的直接相位调制,无需差分编码,也无需外部调制器。分析了利用频率啁啾产生归零差分相移键控(RZ-DPSK)光信号的原理,搭建了基于啁啾管理激光器的2.5Gb/s RZDPSK激光通信系统,同时将该系统与基于LiNbO_3外调制的通信系统进行了性能对比。实验结果表明:当前向纠错极限误码率为10-3时,直接调制RZ-DPSK系统的接收灵敏度为-48.1dBm,与传统外调制方式的灵敏度相当,而且该系统可以有效降低发射端的体积和功耗,结构也更加简单紧凑。
其他语种文摘 Objective Due to its bandwidth advantage,space laser communication has become an effective means to solve the bottleneck of microwave communication,build a space-based broadband network,and realize the real-time transmission of massive amount of earth observation data.The space laser communication terminal has characteristics of small size, lightweight,low power consumption,etc.,which are suitable for satellite payload and meet the increasing communication needs of aerospace activities.In future,each communication satellite will carry multiple laser communication terminals that can serve multiple targets simultaneously.Therefore,laser communication terminals are being developed in the direction of miniaturization and integration.Traditional laser communication terminals use external modulation methods to achieve intensity or phase modulation of optical signals.Optical transmitters comprise multiple independent components, such as lasers,modulators,and bias controllers,and the system's structure is complex.The phase modulation of the optical signal is realized using the direct modulation of the chirp-managed laser(CML),without an external modulator, bias controller,etc.,with small size,low power consumption,low equipment complexity,and low cost.In addition,it can adapt to the continuous,high-speed,and integrated development of optical communication networks. Methods In this study,the chirp effect of the CML is used for phase modulation to generate a return-to-zero differential phase shift keying(RZ-DPSK)signal.RZ-DPSK has several advantages,such as high sensitivity,good reliability,simple receiver,and its receiving sensitivity is 3dB higher than that of on-off keying(OOK)modulation method.It has received extensive attention in the engineering field.Using the chirp effect of the laser,the phase shift of the optical field is achieved by controlling the magnitude of the injected current,and the driving signal is simply pre-encoded using MATLAB to generate a three-level signal,thereby accurately controlling the phase change of the carrier signal.The error rate performance of RZ-DPSK estimated using this modulation method was tested and compared with that of the traditional external modulation method.The performance difference between the two methods was analyzed. Results and Discussions This study first uses the binary sequence“1110100”to verify the system principle.The schematic of the transmitter and receiver experimental schemes are shown in Figures 3and 7,and the signal rate is 2.5Gb/s.The output wavelength of the CML laser is 1552.544nm,and the output optical power is 9.14dBm.The receiving end includes erbium-doped fiber amplifier(EDFA),optical filter,optical delay interferometer,and balanced detector to receive and demodulate RZ-DPSK optical signal and restore the baseband electrical signal.To further reduce the spontaneous radiation noise caused by the amplification process,an optical filter with a bandwidth of 0.05nm is placed after the EDFA.The signal waveform after demodulation is shown in Figure 8.27-1pseudo-random binary sequence (PRBS)is used for bit error rate test.The pseudo-random signal is demodulated by the delay interferometer,and the output signal eye diagram of the balanced detector is shown in Figure 9.As a comparative experiment,the receiving end based on LiNbO_3external modulation and the CML system use the same receiving device.The schematic of the two systems is shown in Figure 10.The bit error rate curves of RZ-DPSK system based on CML transmitter and LiNbO_3 transmitter are shown in the Figure 11.When the system error rate is 10-9,the receiving sensitivity of CML and LiNbO_3 transmitters is-36.98and-45.72dBm,respectively.Compared with the LiNbO_3transmitter,the sensitivity of the CML system is reduced by 8.74dB.When the error rate of the forward error correction limit is 10-3,the sensitivity of the CML transmitter is-48.1dBm,which is only 1.8dB less than the-49.9dBm of the LiNbO_3transmitter.
来源 中国激光 ,2022,49(13):1306001 【核心库】
DOI 10.3788/CJL202249.1306001
关键词 光通信 ; 啁啾管理激光器 ; 啁啾效应 ; 相位调制 ; 归零差分相移键控
地址

1. 中国科学院西安光学精密机械研究所光子网络技术研究室, 陕西, 西安, 710119  

2. 中国科学院西安光学精密机械研究所, 瞬态光学与光子技术国家重点实验室, 陕西, 西安, 710119  

3. 中国科学院大学, 北京, 100049

语种 中文
文献类型 研究性论文
ISSN 0258-7025
学科 电子技术、通信技术
基金 国家重点研发计划
文献收藏号 CSCD:7259829

参考文献 共 26 共2页

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1 齐跃峰 一种新型的DPSK解调系统及性能研究 光学学报,2023,43(5):0506006
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