An individual analysis is done to improve the quality fiber optic connections from the perspective of operating procedures that should follow during fiber optic connection, preparation of fiber optic splicing closure and fiber optic connection process.
The ideal transmission medium for all communications networks is optical fiber transmission. It is suitable for transmitting various services, has low loss, can be used to send high-intensity confidential communications, has a long transmission distance and a wide operating frequency bandwidth. It also has strong anti-interference capabilities.
The most technical and complex process in optical fiber transmission is optical fiber splicing. It requires a lot of engineering. The transmission quality and reliability for the optical fiber line is directly affected by the quality of its quality layer. It is therefore important to improve the quality fiber optic connection. There are two main methods for optical fiber fusion: active connection and fusion splicing.
Practical engineering is the main use of fusion splicing because it has low node loss, high reflection loss, and high reliability. To improve the quality of fiber optic connections, I believe the following should be considered.
What is the connection between fiber optics?
Operators must be trained in the basics of operation and specifications. If the core number is equal, it is recommended that the corresponding color optical fibres be used in the same bundle. However, if the core number is different, the larger number should be spliced first, and then the smaller number should be spliced sequentially. These colors can be divided into the following categories: blue, green, brown and gray; red, yellow, purple, pink and blue should be spliced in sequence. Multi-core optical fiber cables combine optical fibers from different colors into one tube bundle. This allows for multiple tube bundles within an optical cable. The cross-section of an optical cable shows that the red bundle tube is the first tube bundle. Clockwise, it is green, white 1, 2, 3, and so on.
Clean the cutter first and then adjust the position. Stability is important for the placement of your cutter. To avoid bad end faces like burrs, broken fibers, burrs, burrs, and crackeds when cutting, the action must be natural and stable. You can also learn how to “play the piano” and distribute your right fingers in a manner that coordinates with the precise parts of the incision. This will improve your cutting speed and quality.
What is the acceptable loss of splice in optical fiber?
Fiber optic splicing closure can handle preparations such as stripping, coiling, fixing pigtails, and even shearing. You should first do “one look, two looks” before you perform any specific operation. First, review the data and drawings. Next, determine which type of connector you need. Next, examine the direction of optical cable along the actual line. This includes the in/out mark, the end of branch optical cable and whether it is too short or too long. Finally, refer to the structure and dimensions of the splicebox to verify that the splicebox is located on the pole line. Pre-fixed positions ensure that the optical cable is in/out in the air clear and branches are natural and smooth. The curvature is beautiful, scientific, and generous.To ensure the optical fiber is fully disconnected, “Cut” the remaining cable must be cut neatly. To prevent injury to the inner fiber, do not drag the cable along if it is “disconnected wires”. Examine if the optical cable is damaged.
“Cut” refers to the ring-cutting of an optical cable. The strength and depth of the optical cable should be understood. The “layered and progressive”, or “layered and progressive”, method should be used. The position of the reinforcing center should not be altered to avoid damage to the cutting blade. Practice should help you feel the sensation of cutting. Also, the difference in contact between the knife’s shielding layer and the knife should be felt.
The removal of the protective PE plastic layer by “pulling” requires that you are skilled in both methods and techniques. The “one point”, the “two shakes” or “three peels” methods can be used in difficult situations. This is segmental ring cutting, pulling out, shaking cable head to separate layers. It is impossible to do longitudinal stripping. It’s very easy and efficient in extreme cold environments in the wild.
“Solid” means that the optical cable must be waterproofed before it is attached to the splicebox. The reinforcing material should then be secured (the reinforcing material should not be too thick to avoid damage to the core), and finally the plastic tube should also be fixed.
“Disc”: Open and peel the tube of plastic to remove the grease. Coil to find the location of the welding point.
What is fiber optic connection?
1) Remove the fiber optic cables and attach them to the fiber reel frame. There are three types of common optical cables: skeleton, central tube and layered. Different optical cables require different methods of stripping. The optical cables must be attached to the fiber reel frame after being stripped.
2) Pass the fiber through the heat shrink tube. Split the fibers into different colors and place them in the heat-shrinkable tube. Once the splicing process is completed, you can protect the fiber splice with heat shrink tubing.
3) Turn on power to the fusion splicer. Select the correct fusion method. There are two types of power supplies for the fusion splicer: AC and DC. They should be switched according to their type. We know that both conventional single-mode and dispersion switched single-mode fiber have two working wavelengths of 1310nm or 1550nm. Therefore, we must choose the right fusion splicing technique based on the fiber and working wavelength.
4)Prepare the fiber face. The quality of the fiber’s end face directly impacts the quality of the connection. Before you can fusion splice, it is important to make sure that the end face is qualified. To remove the coating layer, use a special stripping instrument. Next, wipe the fiber clean with alcohol-dipped cotton several times. To cut the fiber, use a precision fiber cutter. The cutting length for 0.25nm (outer coat) fiber is 8mm-16mm. For 0.9mm (outer coat) fiber, it can only be cut to 16mm. The cutting head of the cut fiber should not touch any object and should be placed in the fusion splicer as soon as possible. To prevent water stains from occurring after alcohol volatilizes and affecting the welding effect, the alcohol should be high-concentrated industrial alcohol.
5) Place fiber. Place the fiber in the V groove of the fusion cutter. The fiber tip should be placed in the V-shaped groove of the fusion splicer. To prevent hand shaking, the little and ring fingers should touch the fusion rod when placing the fiber core.
6) Connect the optical fibre. The fibers will move towards each other after pressing the splicing button. A short discharge is produced during the moving process to clean the fiber’s surface. The fusion splicer will stop moving towards each other when the gap between the ends of the fiber is correct. The cut is measured and displayed by the fusion splicer. angle. Once the initial gap setting has been completed, the core or the cladding alignment is done. The fusion splicer reduces gap (final gap setting), and the arc created by the high-voltage discharge fuses left and right fibers. Finally, the microprocessor calculates the loss and displays the value on the display. The splicer can still calculate the loss if the loss is greater than it was.
Visually inspect the quality joints using the following: new fusion cutting a, traces B, axial offset C, spherical Joint d, bubbles E, joint thicker that normal fiber f, and joint thinner than usual fiber.
These are the main causes of the problems mentioned above:
- The discharge can be re-discharged (ARC) if it is not in its place.
- There is dirt in a V-shaped groove on the fusion cutter or the motor of X/Y of the Fusion splicer is not balanced. A “self-diagnosis experiment can be done.”
- The fiber end face is not sufficiently mixed and cannot be redone.
- Discharge calibration is possible in long-standing cases due to an uneven discharge.
- Replace the electrode or inspect if there is too much dust in the objective lens. You can scrape the tip of an electrode with a knife.
7) Take out the fiber and strengthen it with a heater. Connect the machine to the windshield. These include: splice mode, data, estimated loss, etc.
After removing the fiber from the fusion splicer take it out and place the heat shrinkable tub in the middle of the fiber. The heater will heat the fiber. Once the heating is complete, remove the fiber from heater. Due to the high temperatures, don’t touch the heat shrink tube or ceramic parts of the heater during operation.
8) Tighten the ends. Place the spliced optical fibre on the optical storage tray. Fix the optical storage tray, the splice boxes, the terminal boxes, and other items to complete the optical fiber fusion.
9) Test. Fiber measurement using optical time domain reflectometer OTDR is divided into three steps: parameter set, data acquisition, and curve analysis.
The following parameters can be manually set for optical time domain reflectometer OTDR:
1.Choose the wavelength l. Different wavelengths correspond with different light characteristics. Selecting the corresponding wavelengths will increase test accuracy.
2.Pulse Width setting. (Pulse width). The longer the pulse width, then the greater the dynamic measurement range, longer the measurement distance and larger the blind area.
You should choose a wider pulse width if you are testing a distance. If you are testing a greater precision, choose an even smaller pulse width.
3.Measurement range (Range). The OTDR measurement distance refers to how far the OTDR can obtain data sampling. The measurement range determines the sampling resolution.
The optimal measurement range has been proven to be between 1.5 and 2.
4.Average time: In general, the signal-to noise ratio is higher the longer the average period. An acquisition time of 3 minutes will increase dynamics by 0.8dB, compared to 1 minute. The default setting is 3 minutes.
5.Fiber parameters: These parameters are the refractive index n, backscattering co n, and backscattering co e.
The distance measurement is determined by the refractive index parameter. While the backscatter coefficient measures reflection and loss, it also affects distance measurements. These parameters are typically provided by the fiber optic manufacturer.
6.Positive gains may be seen on the OTDR curve.
This positive gain can be attributed to the fact that fiber after splice has more backscatter. In this instance, you will need to measure in both directions, and then average the results to determine the splice loss.
All fibers should be gathered into the box
The final step in the continuation is sealing the box. Pay attention to the word “tight” and ensure that the operation takes into consideration both the inside and outside. Check inside the box to make sure the optical fiber is not exposed and that the disk remains intact.
It must be sealed to ensure that it is easy to fold.
External: This means that the seal method for the box body must be considered. The cyclic progressive force method for screw types should be used. This will make the box body withstand even force and prevent it from breaking. The snap-on type should be preheated and baked for winter construction.
We have valuable experience in future construction of optical cable lines because we are focused on improving the quality of fiber optic connections. We should continue to practice engineering and learn new things to improve our connection and operation skills.