Reverse modulation device and method based on micromirror array structure

Abstract

The invention provides a reverse modulation device based on a micromirror array structure. The device comprises a receiving means (1), a first photoelectric converter (3), A first codec (4), A cat's eye device (5), a micromirror array (6) and a driver (7), wherein, the receiving device (1) receives the inquiry light and transmits the inquiry light to a first photoelectric converter (3), the firstphotoelectric converter (3) converts the optical signal into an electrical signal, the first codec (4) encodes the electrical signal to generate a time series code, and sends the time series code to the driver (7); The cat's eye device (5) receives the modulated light and converges the modulated light to the micromirror array (6). The driver (7) drives at least one reflective micromirror in the micromirror array (6) to rotate according to a time series code so that the modulated light is reflected back to the original direction. On the other hand, the invention also provides a reverse modulation method based on a micromirror array structure.

Description

technical field [0001] The invention relates to the field of laser recognition response and reverse modulation, in particular to a reverse modulation device and method based on a micromirror array structure. Background technique [0002] The use of optical reverse modulation technology for wireless optical communication has developed rapidly in recent years. Laser identification response devices using the principle of reverse light modulation can be divided into reflective modulation based on corner reflectors and transmissive modulation based on the cat's eye effect according to different modulation methods. Modulation methods such as defocus modulation and electroabsorption modulation have their own characteristics as follows. [0003] The reflective modulator based on the corner reflector realizes reverse modulation by setting a reflective structure on the reflective surface of the corner reflector and changing the reflection characteristics of the reflective surface. Bo...

AI Technical Summary

Problems solved by technology

The out-of-focus reverse modulator is relatively simple and easy to implement, but the disadvantage is that the modulation contrast is not high and the modulation rate is low

[0006] The electroabsorption modulation based on the cat's eye effect is to place an electroabsorption optical modulator on the focal plane of the cat's eye optical system, and realize the absorption / reflection of the incident light focused on the focal plane through the driving circuit, so as to control the reverse modulation terminal echo state to characterize the For the transmitted information, electro-absorption reverse modulation also has the problem of low modulation contrast

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