Chapter 1 Fiber Optic Connection Before introducing the fiber optic cable performance detection method, we first talk about fiber optic connection, especially fiber end face processing and fusion splicing technology, as a basic skill training that must be mastered. The actual optical communication system consists of three main parts: optical transmitter, optical transmission channel (optical fiber), and optical receiver. The same is true for the transmission performance detection system of optical fiber cable. The connection between the various parts of the system is the problem of optical coupling or optical fiber connection. Both the communication system and the detection system require that the optical coupling between the various parts has high coupling efficiency, stable and reliable connection, and low connection loss. Moreover, optical coupling and optical fiber connection technology are very basic and practical technologies in optical fiber communication systems and detection systems. Section 1 Optical Coupling 1. Coupling of optical fiber and light source In the optical fiber communication system and the optical fiber transmission characteristic detection system, a variety of light sources are used, including semiconductor lasers, gas lasers, liquid lasers, light emitting diodes, wide spectrum light sources, etc. They can be roughly divided into two categories, one is coherent light source, such as various lasers; the other is incoherent light source, such as light emitting diodes, wide spectrum light sources (incandescent lamps). Optical coupling first solves the problem of how to efficiently inject the light emitted by the light source into the transmission channel. To do this, first understand the characteristics of the light source.
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