Deep Dissection of Komshine FX39 Trunk Fusion Splicer Introduction: There are many cable connection

Existing fiber optic connection technology
(1) Temporary connection (cold connection): A method in which the optical fiber is cut into the required section with an optical fiber tool, and then inserted into the SC cold connector to fix it. The advantages are convenience, flexibility and low cost. The disadvantages are poor signal transmission quality and large loss, easy to break and easy to fail.
(2) Active connection: the use of fiber connecting devices to connect fiber lines has the advantages of flexible joints and convenient exchange of connection points. The disadvantage is that the loss and reflection of this connection method are large.
(3) Fixed connection (hot fusion): a fiber splicing method in which the end face of the optical fiber to be connected is melted and connected by the method of heating by a fusion splicer. Since the 1990s, it has become the optical fiber connection method that has been favored by communicators. It can be seen that in terms of signal transmission quality, the use of optical fiber fusion splicers for fixed connection of optical fibers is of higher quality; in addition, the principle of fusion splicers is also more complicated. The principle of the Komshine FX39 is to use a high-voltage ARC to melt the two optical fiber interfaces, and at the same time use a high-precision motion mechanism to gently push the two fibers into one, so as to realize the coupling of the optical fiber mode fields.
Main function modules of FX39

（1）Vision subsystem

The vision subsystem collects the two transmitted information through the image acquisition card. After image processing, feature extraction, and three-dimensional calculation, the optical fiber position information is obtained and the positioning subsystem is controlled to achieve rough adjustment; The video signal is collected and real-time image edge detection is performed. At the same time, the computer image recognition technology and computer intelligent control technology are used to cooperate with the mechanical transmission system to complete the gap and core alignment process of the two optical fibers with high precision. After confirming that the optical fibers are in the best position When the discharge subsystem discharge welding。 FX39 is a typical core-aligned fiber fusion splicer. It adopts CDS (Core Detection System), sometimes called PAS, (Profile Alignment System). It has 6 built-in motors and 2 CCD cameras, and uses a side projection system for fiber alignment. The alignment process of the optical fiber is as follows: the light emitted by the red light source inside the fusion splicer irradiates the optical fiber through the reflector, enters the objective lens and converges, and is then imaged after magnifying 320x on the CCD (Charge Coupled Device) of the X and Y cameras. Due to the different refractive indices of the core and the cladding inside the fiber, the grayscale imaged on the CCD is different, forming bright and dark fringes, and these fringes are aligned by a certain algorithm. （2）Therefore, the alignment degree of the two optical fibers is an important factor in determining the quality of optical fiber fusion. The higher the alignment degree of the optical fibers, the better the fusion quality. In the whole process of adjusting the axis and splice and splicing, FX39 can accurately identify the fiber type and automatically select the matching splice mode for splice, and send the information of the detected state of the splice core to the special program of the fusion splicer through the camera. , the loss value after the connection can be calculated. The method of adjusting the axis of FX39 adopts a complex and precise optical system, so the welding time is shorter, and the welding can be completed in 6 seconds in Quick mode.

（3）Precision Positioning Subsystem
① Mechanical system
The core adjustment mechanism of a general optical fiber fusion splicer only needs 3 degrees of freedom, if in order to realize the coupling of the fiber and the wave-guide device, 6 degrees of freedom should be required. In the FX39 centering mechanism, the translation mechanism is realized by a precision-grinding sliding screw and a high-precision linear slide rail, and the rotating mechanism adopts a precision worm gear structure with a gap-free assembly process.
② Drive System
FX39 is driven by stepper motor. The stepper motor is small in size, simple and flexible in control mode. It adopts subdivided steps, which eliminates resonance factors, has low motion noise, does not have a large system load, and does not lose steps, and can achieve high control accuracy. Both the motor driver of FX39 and the motor controller of the rotating part can meet its precision requirements. （4）Discharge system

Using the principle of arc discharge, the FX39 central control chip controls the discharge of the discharge circuit. After the optical fiber is positioned, the control parameters of the default setting connection mode are transferred from the memory to control the power of the discharge, the number of discharges, and the stepper motor during the discharge process. Advance the situation. In each mode of action, as long as the relevant parameters are automatically loaded to complete. The heating furnace heats the heat-shrinkable tube according to the set temperature. The single-chip microcomputer controls the temperature and timing. After the heat-shrinking is completed, the fan is started to cool. In the fast mode, the FX39 heats the 40mm heat-shrinkable tube for only 16 seconds. Not only that, the 7800mAh high-capacity lithium battery and the electrode with 5000 times of discharge life used by FX39 support the stable operation of the discharge system throughout the process. The built-in six-motor technology of FX39 makes its fusion heating efficiency far higher than that of a four-motor machine. At the same time, it also adopts a specially designed optical lens and software algorithm. The application of core alignment technology is enough to compete with many domestic fusion splicers, even comparable to Fujikura, Sumitomo. At present, FX39 fusion splicer is mainly used for trunk line engineering, metropolitan area network construction, and can also be used for FTTx, security monitoring, etc..