1. Briefly describe the composition of optical fiber.

Answer: The optical fiber is composed of two basic parts: the core and bag layer, and coating layer made of transparent optical materials.

2. What are the basic parameters of the transmission characteristics of the fiber line?

Answer: Including losses, scattering, bandwidth, cut -off wavelength, mold diameter, etc.

3. What are the causes of fiber attenuation?

Answer: The attenuation of the fiber refers to the reduction of the light power between the two cross sections of a fiber, which is related to the wavelength. The main cause of attenuation is scattering, absorption, and light loss caused by connectors and joints.

4. How is the optical fiber attenuation coefficient defined?

Answer: Definition at the attenuation (DB/KM) in the length of a uniform optical fiber unit in a steady -state.

5. What is the loss of insertion?

Answer: It refers to attenuation caused by inserting optical components (such as inserting connectors or couplers) inserted in the optical transmission line.

6. What is the bandwidth of the fiber?

Answer: The bandwidth of optical fiber refers to: In the transmission function of the fiber, the amplitude of the optical power is reduced by 50%or 3DB from the amplitude of the zero frequency. The bandwidth of the optical fiber is similar to that of its length, and the product of the bandwidth length is a constant amount.

7. How many types of optical fiber are scattered? What is the same?

Answer: The color dispersing of the fiber refers to the width of the delay of a fiber in the fiber, including model dispersing, material dispersion and structural scattered. Depending on the characteristics of light sources and optical fibers.

8. How to describe the color dispersion characteristics of signal in the fiber?

Answer: It can be described with pulse exhibition width, optical fiber bandwidth, and color scattered coefficients of fiber optic fiber.

9. What is the deadline?

Answer: refers to the shortest wavelength that can only be transmitted in the fiber. For single -mode optical fiber, its deadline must be shorter than the wavelength of conduction light.

10. What effect does the color scattered of optical fiber have on the performance of the optical fiber communication system?

Answer: The color scattered of the fiber will widen the light pulse during the transmission of the fiber. The size of the error rate, the length of the transmission distance, and the size of the system rate.