Spectrum analytical equipment

Abstract

A spectrum analysis device comprises a tunable Fabry-Perot filter (400), a tunable acoustooptic filter (500), a first photodetector (84), a second photodetector (86), and a system control and data analysis system (92). Incident light (76) is filtered first through the tunable Fabry-Perot filter (400), a light beam (78) output by the tunable Fabry-Perot filter (400) is filtered through the tunable acoustooptic filter (500), the tunable acoustooptic filter (500) outputs two linearly polarized light beams (80, 82) with mutually perpendicular polarization states and having a certain separated included angle, and the two linearly polarized light beams (80, 82) are respectively received by the first photodetector (84) and the second photodetector (86). The system control and data analysis system (92) is used by the spectrum analysis device for detecting the power and spectrum of the incident light (76). The spectrum analysis device has characteristics of absence of mechanical moving parts, stable and reliable performance, small sizes, easiness for mounting and production and the like, meets requirements of small sizes and extreme environments, and may be widely applied in the fields of lasers, optical testing, optical fiber communications, biological and medical instruments, optical fiber sensor networks and the like.

Description

technical field [0001] The invention belongs to the field of optoelectronic technology, in particular to an optical spectrum analysis device. Background technique [0002] Because traditional gratings can have very high spectral resolution in a large spectral range, traditional optical spectrum measurement and analysis equipment generally uses reflective or transmissive gratings. The disadvantage is that it generally needs to use a precision stepping motor to drive the grating to scan. Therefore, the commonly used grating spectral analysis equipment has a relatively large size, is easily affected by mechanical vibration, and is expensive. [0003] The traditional optical Fabry-Perot etalon is a filter device made by the principle of multi-beam interference. There are two main types: one is air-spaced, and the other is optical glass-spaced. Through the multi-beam interference effect of the Fabry-Perot cavity formed by the high reflectivity of the multi-layer dielectric film...

AI Technical Summary

Problems solved by technology

Therefore, it is difficult to achieve a narrowband output with a tunable laser using only an acousto-optic filter

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