1. Briefly describe the composition of the optical fibers.
A: An optical fiber consists of two basic parts: the core and cladding made of transparent optical material and the coating.
2. What are the basic parameters that describe the transmission characteristics of fiber optic lines?
A: Includes loss, dispersion, bandwidth, cutoff wavelength, modal field diameter, etc.
3. What is the cause of fiber attenuation?
Answer: Fiber attenuation refers to the reduction in optical power between two cross-sections of a fiber, which is related to wavelength. The main causes of attenuation are dispersion, absorption, and optical losses due to connectors and splices.
4. How is the fiber attenuation coefficient defined?
Answer: Defined by the attenuation (dB/km) per unit length of a uniform fiber in steady state.
5. What is insertion loss?
Answer: It refers to the attenuation caused by the insertion of optical components (such as the insertion of connectors or couplers) into the optical transmission line.
6. What is bandwidth related to? fiber optics?
Answer: Fiber bandwidth refers to the modulation frequency when the optical power amplitude is 50% or 3 dB lower than the zero frequency amplitude in the fiber's transfer function. The bandwidth of an optical fiber is approximately inversely proportional to its length, and the product of length and bandwidth is a constant.
Post time: Aug-26-2022
