1. What is the birefringence of a single-mode fiber?

There are two orthogonal polarization modes in a single-mode fiber. When the fiber is not perfectly cylindrically symmetric, the two orthogonal polarization modes do not degenerate. The absolute value of the difference between two orthogonal polarization modes is birefringence.

2. What is the most common optical cable structure?

There are stranded optical cable, bundled optical cable, skeleton optical cable and ribbon optical cable.

3. What are the main components of the optical cable?

It is mainly composed of fiber core, fiber paste, sheath material, polybutylene terephthalate and other materials.

4. What is the armor of the optical cable?

Refers to the protective element (usually steel wire or steel tape) used in special-purpose optical cables (such as submarine cables, etc.), and the armor is attached to the inner sheath of the optical cable.

5. What material is used for the cable sheath?

Optical cable jackets are usually made of polyethylene (PE) and polyvinyl chloride (PVC) materials, and their role is to protect the cable core from the outside world.

6. List the special optical cables used in the power system.

Aerial optical cables parallel to power lines are generally referred to as power overhead optical cables. According to the materials used, they can be divided into two categories: metal optical cables and dielectric optical cables. Three additional types. They are optical fiber composite ground wire (OPGW), optical fiber composite phase wire (OPPC), metal self-supporting optical cable (MASS), all-dielectric self-supporting optical cable (ADSS), bundled optical cable (ADL) and winding optical cable (GWWOP). kind.

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