激光与光电子学进展, 2019, 56 (13): 131403, 网络出版: 2019-07-11
50 GHz宽带混沌信号发生器 
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50 GHz Broadband Chaotic Signal Generator
激光器 混沌激光 放大自发辐射扰动 互注入 带宽 lasers chaotic laser amplified spontaneous emission perturbation mutual injection bandwidth
摘要
基于放大自发辐射(ASE)噪声扰动和半导体激光器互注入的方法,设计并研制了一款50 GHz宽带混沌信号发生器。该信号发生器主要包括两个分布式反馈半导体激光器(DFB-SL)和一个半导体光放大器(SOA),利用SOA产生的ASE噪声扰动SL产生混沌激光,基于SL互注入的拍频效应进一步实现频谱整形和带宽增强。在反馈强度为9.096%、频率失谐量为32.75 GHz、耦合强度为1.966的状态下,信号发生器可以产生频谱带宽超过50 GHz、平坦度为±2.5 dB、光谱线宽为0.56 nm的混沌激光。高带宽、高平坦度的宽带混沌信号发生器的研制,解决了混沌激光存在的频谱不平坦、带宽窄等问题,将进一步推动混沌激光的产业化应用。
Abstract
Herein, a broadband chaotic signal generator with a bandwidth of 50 GHz is designed and developed, based on the perturbation of amplified spontaneous emission (ASE) noise in conjunction with semiconductor laser mutual injection. The generator primarily contains two distributed-feedback semiconductor lasers (DFB-SL) and one semiconductor optical amplifier (SOA). Chaotic laser is obtained by perturbing the SL with ASE noise generated by the SOA. In addition, the beating effect caused by the SL mutual injection is exploited to achieve spectrum shaping and bandwidth enhancement. With a feedback strength of 9.096%, frequency detuning of 32.75 GHz, and coupling strength of 1.966, the chaotic laser with a bandwidth exceeding 50 GHz, flatness of ±2.5 dB, and linewidth of 0.56 nm is generated by the signal generator. This broadband chaotic signal generator, with large bandwidth and high flatness, solves the problems of uneven spectrum and narrow bandwidth of chaotic lasers, and further promotes the industrial application of chaotic laser.
吕天爽, 杨强, 于小雨, 乔丽君, 张建忠, 王涛, 汪钦, 徐红春, 张明江. 50 GHz宽带混沌信号发生器[J]. 激光与光电子学进展, 2019, 56(13): 131403. Tianshuang Lü, Qiang Yang, Xiaoyu Yu, Lijun Qiao, Jianzhong Zhang, Tao Wang, Qin Wang, Hongchun Xu, Mingjiang Zhang. 50 GHz Broadband Chaotic Signal Generator[J]. Laser & Optoelectronics Progress, 2019, 56(13): 131403.
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