1. Briefly describe the composition of the fiber.
A: The fiber consists of two basic parts: a core and a cladding, a coating made of a transparent optical material.

2. What are the basic parameters describing the transmission characteristics of optical fiber lines?
A: Including loss, dispersion, bandwidth, cutoff wavelength, mode field diameter, etc.

3. How is the fiber attenuation coefficient defined?
A: Defined by the attenuation per unit length of a uniform fiber in the steady state (dB/km).

4. What is the insertion loss?
A: Refers to the attenuation caused by the insertion of optical components (such as plug connectors or couplers) in the optical transmission line.

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