中国激光, 2009, 36 (s1): 302, 网络出版: 2009-06-18
波形测量引导光谱整形用以控制调频到调幅效应的方法
Method to Control FM-to-AM Conversion Using Spectrum Shaping Guided by Waveform Measuring
激光技术 调频到调幅 光谱整形 波形测量 G-S迭代 laser technique FM-to-AM spectrum shaping waveform measurement G-S iteration
摘要
经过正弦相位调制产生的宽带光脉冲在传输放大过程中, 由于光谱成分改变, 会产生调频到调幅(FM-to-AM)的转变, 造成脉冲时域上的强度调制。由于光谱带宽较小(约0.3 nm), 其细微结构难以精确测量。为了控制这种效应, 提出了一种通过波形测量来引导光谱整形的补偿方法。通过测量传输前后的时间波形, 采用G-S迭代解算出整形光谱分布, 利用液晶空间光调制器进行光谱整形, 补偿FM-to-AM效应。通过数值模拟, 对方法的细节进行了改进, 提出了测量仪器的指标要求。结果表明, 在一定传输条件下, 该方法能够有效控制FM-to-AM效应, 解决时域强度调制问题。
Abstract
In the transmission process, broadband optical pulses generated through sinusoidal phase modulation, as a result of changes in spectral composition, will lead to FM-to-AM, resulting in pulse intensity modulation in the time domain. It is difficult to measure the microstructure of spectrum accurately due to the narrow spectrum bandwidth (about 0.3nm). In order to control this effect, the paper presents a compensation method of spectral shaping guided by waveform measurement. By measuring the waveform before and after transmission, the shaping pulse spectrum will be calculated using G-S iterative method. Liquid crystal spatial modulator is used for spectrum shaping in order to compensate FM-to-AM effect. By numerical simulation, the details of the methods are improved and requirements for measuring instruments are proposed. The results show that, under certain transmission conditions, this method can effectively control the FM-to-AM effect, to resolve the issue of time-domain intensity modulation.
耿远超, 粟敬钦, 张锐, 莫磊, 王方, 刘兰琴, 王文义. 波形测量引导光谱整形用以控制调频到调幅效应的方法[J]. 中国激光, 2009, 36(s1): 302. Geng Yuanchao, Su Jinqin, Zhang Rui, Mo Lei, Wang Fang, Liu Lanqing, Wang Wenyi. Method to Control FM-to-AM Conversion Using Spectrum Shaping Guided by Waveform Measuring[J]. Chinese Journal of Lasers, 2009, 36(s1): 302.