Rapid vector measurement device and measurement method based on double optical frequency combs

Abstract

The invention discloses a rapid vector measurement device and ameasurement method based on double optical frequency combs. The measurement device comprises a laser, an optical frequency comb generation module, a to-be-tested optical device module, a 90-degree optical mixer module and a data processing module. The optical frequency comb generation module comprises a signal optical frequency comb generation module and a local oscillation optical frequency comb generation module, the laser is respectively connected with the signal optical frequency comb generation module and the local oscillation optical frequency comb generation module, and the signal optical frequency comb generation module, the to-be-tested optical device module and the 90-degree optical mixer module are sequentially connected. The local oscillation optical frequency comb generation module is connected with the 90-degree optical mixer module, and the output end of the 90-degree optical mixer module is electrically connected with the data processing module. A signal optical frequency comb and a local oscillation optical frequency comb are respectively generated in an optical frequency comb generation module through the same laser source, then frequency mixing, Fourier transform, normalization and other processing are carried out on signals, and finally the spectral response of theto-be-tested device is obtained. The interference of the image frequency signal can be suppressed, and the spectrum utilization rate and the measurement precision of the signal optical frequency comb are improved.

Description

technical field [0001] The invention relates to the field of gas source measurement, in particular to a fast vector measurement device and measurement method based on dual optical frequency combs. Background technique [0002] At present, the emission of greenhouse gases and pollutants poses a serious threat to global warming, human health and safety. Therefore, it is of great significance to conduct regional detection, quantitative detection and source analysis of trace gas sources. Accurate measurement of spectral response is an important means for precise quantitative detection and analysis of trace gas sources. The high-precision optical vector network analysis instrument provides powerful measurement technology support for real-time remote sensing of the atmosphere, rapid medical diagnosis and research on related scientific issues. However, due to the fast-changing characteristics of the spectrum response of the trace gas to be tested, it is difficult to measure quick...

AI Technical Summary

Problems solved by technology

Laser scanning spectral testing technology and Fourier spectral analysis technology are typical cursor analysis technologies. Although the resolution of Fourier spectral analysis technology can reach ~30MHz, its long measurement time and its susceptibility to external interference limit it. Only suitable for devices under test with large linewidth and high spectral stability

The optical vector analysis technology is mainly based on the single sideband modulation optical vector analysis technology, but this scheme still has shortcomings such as small measurement bandwidth, large nonlinear error and long measurement time.

Images