Analysis of SNR for laser heterodyne detection with a weak local oscillator based on a MPPC

	Analysis of SNR for laser heterodyne detection with a weak local oscillator based on a MPPC
	Zhang H.-Y.; Zhao S.; Wang T.-F.; Guo J.
	2013
发表期刊	Journal of Modern Optics
ISSN	ISBN/09500340
卷号	60 期号:20
摘要	In order to avoid the influence of shot noise due to the powerful local oscillator (LO) in traditional heterodyne detection, the signal-to-noise ratio (SNR) was analyzed for laser heterodyne detection with a weak LO at the photon level. First, the expression for the SNR with a pulsed laser was applied to the condition of partial CW and weak LO laser heterodyne detection, the spectrum of the heterodyne signal with the center frequency 212 kHz was obtained, and the theoretical value of the SNR found to be in agreement with experiment. Second, the techniques of data segment fractionizing and power spectral sensity (PSD) averaging were used to investigate the SNR. The results show that the volume of the data required can be decreased by a factor of 10 compared with the traditional PSD averaging, the data resource is fully used while signal processing, and the signal-to-noise improved ratio (SNIR) nearly obeys the rule (m is the averaging time) under a small quantity of data segments. Finally, the limiting factors about the SNIR during the PSD averaging have been determined so that good use can be made of the data. 2014 Taylor Francis.
收录类别	EI
文献类型	期刊论文
条目标识符	http://ir.ciomp.ac.cn/handle/181722/40554
专题	中科院长春光机所知识产出
推荐引用方式 GB/T 7714	Zhang H.-Y.,Zhao S.,Wang T.-F.,et al. Analysis of SNR for laser heterodyne detection with a weak local oscillator based on a MPPC[J]. Journal of Modern Optics,2013,60(20).
APA	Zhang H.-Y.,Zhao S.,Wang T.-F.,&Guo J..(2013).Analysis of SNR for laser heterodyne detection with a weak local oscillator based on a MPPC.Journal of Modern Optics,60(20).
MLA	Zhang H.-Y.,et al."Analysis of SNR for laser heterodyne detection with a weak local oscillator based on a MPPC".Journal of Modern Optics 60.20(2013).

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