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When the geometric size of the optical fiber is much larger than the optical wavelength, there will be dozens or even hundreds of propagation modes in the optical fiber.

According to different transmission media, optical fiber connectors can be divided into common single-mode and multi-mode connectors of silicon-based optical fiber, as well as other optical fiber conn

Coaxial cable refers to a cable with two concentric conductors, and the conductor and shielding layer share the same axis.

According to the propagation rate: super class 5, class 6, class 6a, (i.e. super class 6)