Optical vector-matrix multiplier based on stable polarization VCSEL (Vertical Cavity Surface Emitting Laser)

Abstract

The invention discloses an optical vector-matrix multiplier system based on a stable polarization VCSEL (Vertical Cavity Surface Emitting Laser), which belongs to the field of optical computer. In the invention, a sub-wavelength grating is processed at a VCSEL perforation place so that the polarization noise of VCSEL light source emergent light is greatly reduced and the VCSEL light source emergent light becomes stable so as to eliminate the impact of unstable VCSEL light source polarization on the calculation of the optical vector-matrix multiplier; in addition, the calculation process of the optical vector-matrix multiplier can be completed by using one path of polarization light, and thus the structure of the optical vector-matrix multiplier system is greatly simplified. The invention realizes multi-gray level calculation, improves the calculation accuracy of the system, reduces the difficulty of design process and adjustment of the system and also reduces the production cost of the system.

Description

technical field [0001] The invention relates to a photoelectric computer, in particular to an optical vector-matrix multiplier system based on a vertical cavity surface emitting laser component. Background technique [0002] Optical computing has been widely studied due to its advantages of parallelism and high information processing rate. Among them, the optical vector-matrix multiplier system is a kind of optical computer. The system can perform vector-matrix multiplication between large-scale linear arrays and planar arrays. Its schematic diagram is as follows figure 1 shown. In this system, the vertical cavity surface emitting laser (hereinafter referred to as VCSEL) line array or light emitting diode (LED) line array is often used as the input vector. On a column of pixels of a multi-quantum well spatial light modulator (modulation matrix), the light intensity reflected by each pixel of the modulator changes after being modulated and absorbed by each pixel of the mo...

AI Technical Summary

Problems solved by technology

There is a problem in the commonly used VCSEL arrays at present: its polarization state changes with the increase of the injection current. Even under the same injection current, the polarization of the VCSEL will jitter randomly. This is the polarization noise of the VCSEL. Its frequency Generally on the order of hundreds of megahertz

The disadvantage of this system design is that the two paths of light must be strictly symmetrical. In the case of high-speed computing, the optical paths of the two paths of light must be strictly equal, and the pixels of each channel of the two paths of light must be absolutely aligned. The modulation coefficient and other parameters of the system must be exactly the same, so as not to cause calculation errors

This greatly increases the difficulty of system design, processing, assembly and debugging

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