论文部分内容阅读
基于海上油藏勘探领域的光纤检波器光电复合空分阵列系统,通过两路PGC干涉检波信号相除以构造非线性函数,提出了一种采用查找表实现该非线性函数解调的新方法。相比传统的两路PGC干涉检波信号线性组合的反正切解调方法,构造非线性函数解调新方案不仅可以补偿生成载波时直接调制DFB光源带来的高频光强波动干扰,也可以抑制其他因素造成的光强随机波动给采用定常系统参数解调带来的影响。实验结果表明:内调制DFB激光器,采用非线性函数解调方案比线性组合方案在谐波抑制方面优势明显,两者HSR平均值相差达26.37 dB;当系统光强降低50%,非线性函数解调方案的结果 HSR平均值优于线性组合方案得到的结果,两者相差达17.53 dB。
Based on the optoelectronic composite space division array system of optical fiber detector in the field of offshore oil exploration, a new method of using the look-up table to realize the demodulation of the nonlinear function is proposed by dividing the two PGC interference detection signals to construct the nonlinear function. Compared with the traditional method of inverse tangent demodulation of two linear combinations of PGC interferometric signals, constructing a new nonlinear function demodulation scheme can not only compensate the interference of high-frequency light intensity fluctuations caused by the direct modulation of DFB light source when generating a carrier, but also suppress other factors The light intensity caused by random fluctuations to the use of the parameters of the system to demodulate the impact of regular. The experimental results show that the internal modulation DFB laser has more advantages than the linear combination demodulation scheme in harmonic suppression in terms of harmonic suppression, the difference between the two is 26.37 dB; when the system light intensity is reduced by 50%, the nonlinear function solution The result of adjusting program is better than the result of linear combination scheme, the difference between them is 17.53 dB.