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The bandwidth of light is the product of the modulation frequency of the maximum modulation frequency pulse and the length of the optical fiber through which a fiber can pass. It is a comprehensive index that characterizes the optical characteristics of a multimode fiber. For example, the optical transmitter of an ordinary fiber cable is generally an LED (Light Emitting Diode). It is required that the optical cable should have a bandwidth of at least 200 MHz at 850 nm. The optical transmitter of the OM3 optical cable is a VCSEL (vertical cavity surface emitting laser), which requires the optical cable to reach 2000 MHz at 850 nm. Affected by many factors, such as light source, coupling mode, waveguide structure, and receiver performance, etc., apart from other influencing factors, for the optical fiber itself, the factor determining its bandwidth is the dispersion characteristics of the multimode optical fiber. Considering that there are few optical transmission paths within a single-mode fiber, the dispersion between the modes is small and even negligible. The laser dispersion of the matched LD light emitter is small, so the bandwidth of the optical fiber is currently limited to the multimode fiber. The transmission bandwidth of a mode fiber can be understood to be infinite, but it itself has a high requirement for a connector, so single-mode fiber is generally the choice for long-distance communication.