Externally Modulated Optical Minimum Shift Keying Format
Externally Modulated Optical Minimum Shift Keying Format
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DOI：
10.1109/jlt.2007.903634
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发表时间：
2007-10
影响因子：
4.7
通讯作者：
J. Mo;Y. Wen;Yixin Wang;Chao Lu;W. Zhong
中科院分区：
文献类型：
--
作者：
J. Mo;Y. Wen;Yixin Wang;Chao Lu;W. Zhong
本文介绍了用于高速高频谱效率波分复用系统的光最小频移键控（MSK）的产生和性能评价。详细推导和分析了光MSK产生和检测的原理。利用该方案成功地产生了10.7Gb/s的光MSK数据。结果表明，光MSK信号具有非常紧凑的光谱。从色散容限、线性串扰、自相位调制（SPM）容限、受激布里渊散射（SBS）阈值、最佳接收器滤波器带宽和进入单模光纤和色散补偿光纤的最佳链路发射功率。实验和仿真结果表明，与RZ-DPSK和RZ-OOK相比，MSK信号对光纤色散和SPM效应的容忍度最大。实验结果也证实了对SPM效应的负惩罚。MSK和RZ-DPSK系统的受激布里渊散射阈值比RZ-OOK系统的受激布里渊散射阈值高10 dB以上。与RZ-OOK和RZ-DPSK相比，采用传统载波抑制归零（CSRZ）脉冲产生的MSK具有更窄的最佳光滤波带宽和更宽的电滤波带宽。用纯双模脉冲产生的MSK信号在高光信噪比（OSNR）下具有与RZ-OOK和RZ-DPSK相似的最佳范围，但在低OSNR下具有较窄的最佳光学滤波器带宽。最佳光纤发射功率的研究表明，MSK信号，使用传统的CSRZ脉冲产生具有较高的最佳发射功率，这与SPM公差的研究。
This paper presents the generation and the performance evaluation of optical minimum shift keying (MSK) for high-speed and high-spectral-efficiency wavelength-division multiplexing systems. The detailed principle on optical MSK generation and detection is derived and analyzed. Optical MSK data (10.7 Gb/s) are successfully generated by an experiment using the proposed scheme. The results show that the optical MSK signal exhibits a very compact optical spectrum. The performance of the optical MSK modulated system is evaluated and compared with those of 50% duty-cycle return-to-zero differential phase shift keying (RZ-DPSK) and 50% duty-cycle return-to-zero on-off keying (RZ-OOK) modulated systems, via both simulation and experiment, in terms of dispersion tolerance, linear crosstalk, self-phase modulation (SPM) tolerance, stimulated Brillouin scattering (SBS) threshold, optimal receiver filter bandwidth, and optimal link launch power into single-mode fibers and dispersion compensation fibers. Experimental and simulation results show that the MSK signal exhibits the largest tolerance against fiber dispersion and SPM effect as compared with RZ-DPSK and RZ-OOK. Experimental results also confirm the negative penalty against the SPM effect. The SBS threshold of both the MSK and RZ-DPSK systems is more than 10 dB higher than that of the RZ-OOK system. The MSK that is generated with conventional carrier-suppressed return-to-zero (CSRZ) pulses exhibits a narrower optimal optical filter bandwidth but a wider electrical filter bandwidth compared with those of RZ-OOK and RZ-DPSK. The MSK signal that is generated with pure dual-mode pulses has a similar optimum range to RZ-OOK and RZ-DPSK at a high optical signal-to-noise ratio (OSNR) but has a narrower optimal optical filter bandwidth at a low OSNR. The optimum fiber launch power study shows that the MSK signal that is generated using the conventional CSRZ pulses exhibits higher optimum launch power, which agrees with the SPM tolerance study.