Chinese product manual describing multimode fiber optic cable basics, structure, classification, attenuation, and modal bandwidth.
This Chinese-language product manual covers multimode fiber (多模光纤) optic cable, starting with fiber basics and a comparison between ordinary cable and fiber transmission. It explains fiber's low loss, wide bandwidth, immunity to interference, safety, light weight, and mechanical properties, then describes the fiber structure and the difference between multimode and single-mode fiber.
The manual also discusses fiber classification by material, the recommendation to choose 50/125 µm multimode glass fiber, the decibel concept, and attenuation and modal bandwidth. The extracted pages do not identify a manufacturer or a specific product model number. This manual is written in Chinese.
| Multimode fiber core diameter | 50 or 62.5 µm |
|---|---|
| Single-mode fiber core diameter | 8–10 µm |
| Single-mode attenuation at 1300 nm | 0.4 dB/km |
| Single-mode attenuation at 1550 nm | 0.3 dB/km |
| 50/125 µm multimode attenuation at 1300 nm | ≈1.0 dB/km |
| 50/125 µm multimode modal bandwidth at 1300 nm | ≥500 MHz·km |
It is a fiber that allows multiple modes, or paths, of light to travel in the same core.
The document says 50/125 µm fiber has higher bandwidth than 62.5/125 µm fiber and can reduce production cost.
Modal bandwidth is the main limit for multimode fiber communication distance.
They are two important fiber parameters: attenuation describes signal strength over distance, and modal bandwidth describes available communication bandwidth.