How to distinguish between single-mode fiber and multimode fiber?

I. How to distinguish between single-mode fiber and multi-mode fiber? 1. single-mode fiber: the center glass core is thin (core diameter is generally 9μm some called 8.3μm or 10μm is also this kind, the outer diameter is 125μm), so the model is called 9/125. can only transmit a mode of light. Because of its intermodal dispersion is very small, the transmission distance of several hundred kilometers, suitable for long-distance communication. Long-distance transmission generally use single-mode fiber. 2. Ordinary multimode fiber numerical aperture of 0.2 ± 0.02, core diameter / outer diameter of 50 μm / 125 μnu its transmission parameters for the bandwidth and loss. Due to the multi-mode fiber transmission of hundreds of modes, the propagation constant and group rate of each mode is different, so that the bandwidth of the fiber is narrow, dispersion is large, the loss is also large, is only suitable for short and medium distances and small-capacity fiber-optic communication system. Multimode fiber allows different modes of light transmission on a single fiber, due to the core diameter of the multimode fiber is larger, so you can use the cheaper coupler and junction, the core diameter of the multimode fiber for the 50μm to 100μm.

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