Can I just twist them together like electrical wires? Why is a specialized fusion splicer needed?
No. Fiber optic jumpers cannot be twisted together like electrical wires. If you cut the optical fiber yourself, it will not transmit any signal. To reconnect, professional equipment with high precision (such as a fiber splicer or a high-precision mechanical splice tool) must be used.
The reasons behind this involve the physical mechanisms of metal conductivity versus glass light transmission, and the engineering precision requirements at the micrometer level:
1. Comparison of Physical Mechanisms: Electrical Wires (Electrons) vs. Fiber Optics (Photons)
- Conductivity Principle of Electrical Wires (Copper Wires):
What is transmitted inside electrical wires is an electron flow. Metals (like copper) have good ductility and conductivity. When two copper wires are twisted together, as long as the metal surfaces make contact, electrons can flow freely across the contact surface. Even with slightly higher contact resistance, current can still pass. - Light Transmission Principle of Fiber Optics:
Fiber optics transmit photons (electromagnetic waves), utilizing the principle of total internal reflection.- Extremely Small Geometric Dimensions:
Taking commonly used single-mode fiber (e.g., G.652D or G.657) as an example, the core through which light passes has a diameter of only about 9 micrometers (9 μm), which is about one-tenth the diameter of a human hair. - Brittle Quartz Medium:
The material of optical fiber is high-purity silicon dioxide (quartz glass), which is extremely brittle. If bent or twisted like an electrical wire, the optical fiber will immediately undergo brittle fracture, and the physical pathway will be completely destroyed.
- Extremely Small Geometric Dimensions: