Correct use of the fiber cleaver is the core link to ensure the quality of the fiber end face, which directly affects the subsequent fusion loss and link performance. The following are detailed operation steps and key points to help you standardize the operation and improve the cutting accuracy:
1. Preparation before operation: tool and environmental requirements
Required tools
Miller pliers: used to strip the fiber coating (it is recommended to choose a model with a scale to facilitate the control of the stripping length);
Anhydrous alcohol (purity ≥99%) and dust-free cotton swabs/wiping paper: clean the fiber and cleaver;
Fiber cleaver: check in advance whether the blade is sharp and whether the V-groove is clean and free of debris;
Tweezers: avoid touching the end face with your fingers when taking and placing the fiber.
Environmental requirements
The operating table should be flat and dry, and avoid direct strong light (affecting the observation of the fiber);
Keep the room clean and reduce dust (dust may adhere to the fiber end face or cleaver parts).
2. Standard operation steps: Five-step standard method
1. Strip the fiber coating (stripping)
Length control: According to the requirements of the cutter scale, generally strip 3-4cm (if the maximum cutter scale is 1.5cm, the stripping length needs to leave a margin);
Operation skills:
Use Miller pliers to lightly clamp the fiber (moderate force to avoid crushing the fiber core), rotate 1-2 circles and slowly pull out the coating;
If the coating is hard (such as tight-fitting fiber), it can be stripped in two sections (strip 2cm first, then strip the remaining part) to reduce the force on the fiber.
Inspection points: The stripped fiber should be free of scratches and deformation, and the fiber core should be transparent without white fog (if there is damage, re-stripping is required).
2. Clean the fiber (key step!)
Cleaning method:
Take a cotton swab and dip it in alcohol, and wipe it unidirectionally from the stripped end of the fiber to the unstripped end (avoid wiping back and forth to cause debris to flow back);
Wipe 2-3 times to ensure that the oil and debris are completely removed (proceed to the next step after the alcohol evaporates).
Notes:
Do not touch the cleaned optical fiber directly with your hands. If you need to adjust the position, use tweezers to gently clamp the end of the unstripped coating.
3. Clamp the optical fiber (the core step to determine the cutting angle)
Align the ruler: Put the optical fiber into the V-groove of the cleaver, align the end face of the optical fiber with the scale of the cleaver ruler (if the ruler marks 1cm, leave 1cm cutting length);
Fix the optical fiber:
Manual cleaver: Gently press the clamp pressure rod, and the force should be appropriate to prevent the optical fiber from sliding (too tight may break the optical fiber, too loose may cause displacement during cutting);
Automatic cleaver: After the optical fiber is placed, the clamp will automatically tighten (some models require manual sliding of the clamp into place).
Check alignment: Observe from the side whether the optical fiber is completely close to the bottom of the V-groove, without warping or offset (if not, re-clamp).
4. Cutting the optical fiber (force and speed determine the end face quality)
Manual cutting knife operation:
Pinch the push knife handle with your thumb and index finger, and push it in the cutting direction at a constant speed (speed is about 2-3cm/s), avoiding acceleration or pause;
Keep your wrist stable when pushing the knife, and avoid shaking left and right (shaking will cause the blade to deviate, tilt or break).
Automatic cutting knife operation:
After pressing the start button, wait for the blade to automatically complete the cutting and reset (no manual force is required throughout the process);
High-end models (such as Fujikura CT50) are equipped with a pressure sensor device, which automatically adapts to different optical fiber types without manual adjustment of force.
Taboo actions: Do not push the blade hard or cut the same position repeatedly (it may cause the blade to break or the optical fiber to break).
5. Fiber extraction and end face protection
Fiber extraction method: Use tweezers to gently clamp the non-cut end of the optical fiber (≥1cm from the end face), lift it vertically and put it into the V-groove of the fusion splicer;
Anti-pollution measures:
Put the optical fiber into the fusion splicer immediately after cutting to avoid exposing it to the air for too long (dust may adhere to the end face);
If you are not splicing temporarily, cover the end face of the optical fiber with a dust cap (or place it on a clean slide).
III. Key skills and common problems to avoid
Stabilize hand operation
When cutting, lean your elbows lightly against the sides of your body and use your forearms to drive your wrists to push the knife (reduce hand shaking);
Newbies can practice pushing the knife on waste optical fibers until they can control the linear motion of the blade.
Handling of different fiber types
Single-mode fiber: thin core (9μm), needs to be handled more gently to avoid excessive force during cutting and causing breakage;
Multimode fiber (50/62.5μm): thicker but brittle, pay attention to moderate clamp pressure when clamping;
Leather fiber/indoor optical cable: need to strip the outer sheath first, expose the fiber and then follow the above steps (pay attention to protect the fiber core from bending).
Instant quality inspection
After cutting, the end face can be observed through the microscope provided by the fusion splicer (ideal state: mirror smooth, no cracks, burrs, tilt angle ≤0.5°);
If the end face is found to be unqualified (such as broken mouth, tilt), immediately analyze the cause and re-cut (common causes: V-groove has debris, blade wear, clamping is not in place).
IV. Maintenance and care: Extend the life of the cutting knife
After each use: Use a toothpick to clean the fiber debris in the V-groove, and wipe the blade surface with an alcohol swab (to remove the fine powder generated during cutting);
Regular maintenance: Check the blade wear every week (rotate the blade to the unused edge), and use a compressed gas tank to clean the dust inside the cutting knife every month;
Long-term storage: Apply anti-rust oil to the blade and store it in a moisture-proof box to prevent the blade from oxidation or the V-groove from being damp and deformed.
Summary: Core formula for quality control
Strip the fiber steadily, clean it, clamp it evenly, push the knife evenly, and take the fiber lightly
Strictly following the above steps can greatly improve the quality of fiber cutting, ensure that the fusion loss is ≤0.1dB (single-mode fiber), and meet the needs of high-standard scenarios such as communication engineering and data centers. Practice more and observe more in actual operation, gradually form muscle memory, and you can become a "precise hand" for fiber cutting!
