A novel inspection of fiber post-weld-shift in butterfly laser module packaging

Abstract

Butterfly packaging technology with a fiber pigtail is widely used in packaging optical modules, and laser welding is used to join components in a butterfly package. During laser welding, the rapid solidification of the welded region and the associated shrinkage of material are expected cause relative movement between prealigned components. Such a post-weld-shift (PWS) might significantly reduce the efficiency of light coupling. The laser hammer technique can be used to realign fiber that shifts during laser welding, and it requires that the fiber shift be measured in three directions. Measuring the shift along the axis is difficult because space is limited. In this paper, a reflector placed near the fiber during laser welding was used to determine the shift along the -axis. The fiber images obtained using the charge-coupled device (CCD) camera were sometimes deformed, so digital image processing was used to calibrate the deformed images and calculate the fiber shift along three axes. The experimental results indicate that the fiber shift along the -axis, when captured using reflector inspection could be measured precisely, and more strongly influenced power coupling loss than shifts in the other two directions. The results are useful in implementing the realignment method after butterfly packaging.Index Terms-Butterfly package, fiber alignment shift, mirror inspection, post-weld-shift (PWS).

Research on Micro-Heater Based on Pt-100

“…It mainly consists of four different parts: [1] thin Pt-100 film for measuring temperature, [2] thin Pt-100 film for heating the work pieces, [3] bakelite supporting plate and [4] red copper heat capacity block. And in order to accelerate the heat conduction, all those parts are bonded together with the heat-conducting glue.…”

“…With the development of technology, mechanical systems are becoming more and more miniaturized. Serving as the key manufacturing technology of micro-system, with the advantage of tiny size, accurate temperature control and high heating rate, micro-tin-based-brazing is now widely employed in coupling between micro-devices [1][2][3][4]. Since the general heater can hardly satisfy the increasing demands of the micro-tin-based-brazing, a new type of micro-heater based on Pt-100 is developed in this paper.…”

A Robust Vision Based Weld Center Finding Method In Automatic Ultrasonic Nondestructive Test

“…Liaoning Normal University Dalian,China zt2941 @sina.com 11. SYSTEM DESCRIPTION The automatic ultrasonic nondestructive test system using the proposed method is shown in Fig.…”

“…In the literature [5][6][7][8][9][10][11][12], the weld corners can be located by finding absolute maximum deviation points on the laser strip center profile, however, in experiments, we found these algorithms sometimes were very sensitive to noises such as optical disturbance or sometimes were very time consuming. We proposed a fast finding corners method shown in Fig.5, the basic ideas of the method are:…”