In this paper,polarization switching performances and polarization bistability performances in VCSEL subjected to optical feedback had been investigated.

Based on the rate equations describing the dynamic characteristics of the master and slave vertical cavity surface emitting laser (M-VCSEL,S-VCSEL),under the modulation of pulsed bias current,the polarization characteristics of M-VCSEL output and the polarization switching performance of S-VCSEL subjected to optical pulse output from the M-VCSEL have been investigated.

This paper analyzes the running deviation of conveyor belt,puts forward precautionary measures of running deviation under different situation,studies on corrective measures,self-corrective measures and its principle in de.

In aluminium strip hot rolling process,because the landscape orientation parameters of the workpiece and the rolling mill are not even,there is always departure between the center line of the workpiece and the assumed center line,which is called running deviation.

This paper introduces the reasons of belt coveryor's belt running deviation,and some methods to adjust deviation.

Intelligent control system for edge position deviation of narrow fabrics;

The automatic system of conveyer belt deviation;

The measures analysis of occurring deviation while installing prevention embryonic plate of heating-furnace;

Rearch for rolling deviation value in unsymmetrical plate/strip rolling;

At the same time,rolling deviation is used.