Close ware and laser instrument system of restrainting

The utility model provides a close and restraint the ware, including a multi beam multimode fiber, the 2nd multimode fiber and output optical fibre, a multi beam multimode fiber's output and the 2nd multimode fiber's input butt fusion are provided with covering light filtering portion on the 2nd multimode fiber, the 2nd multimode fiber's output and output optical fibre butt fusion. Through settingup covering light filtering portion on the 2nd multimode fiber, can adopt to covering light filtering portion to set up the close covering photospallation layer of refracting index or form sculptureon the fiber cladding for most reverse transmission reverse covering light will be through this covering light filtering portion filtering, thereby can further not return to and draw the awl region orinput optic fibre, avoided the influence of reverse covering light to closing bundle ware or even pumping LD. 本实用新型提供种合束器，包括多束第多模光纤、第二多模光纤和输出光纤，多束第多模光纤的输出端与第二多模光纤的输入端熔接，第二多模光纤上设置有包层光滤除部，第二多模光纤的输出端与输出光纤熔接。通过在第二多模光纤上设置包层光滤除部，对于包