Optical fiber discerning method
Jul 05, 2023
Color discern
Yellow represents single mode
Orange represents multi -mode
Different jacket identification
50/125, 62.5/125 is multi -mode, and may be marked with mm
9/125 (G652) is a single mode, and it may be marked with SM
Optical fiber grinding end
You can distinguish it under the magnifying glass, and the multi -mode is concentric circular
There is a black dot in the middle of the single mode
The fuse can be distinguished from the screen when it is fused
There is no white strip in the middle of the multi -mode fiber
There is a white strip in the middle of the single mode
At the same time, the melting machine does not calculate the melting loss of the multi -mode optical cable. Besides, single -mode and multi -mode fiber fiber melting machines cannot be melted.
The single -mode transceiver can be used for multi -mode optical cable links, but pay attention to the multi -mode jump.
According to the mode of transmission in the fiber of the optical fiber, there are two main categories: single -mode and multi -mode. The mode usually refers to the transmission path of the optical signal in the optical fiber. The transmission path of the single -mode is the central axis; cut the fiber to cut a plane along the central axis, and the optical signal is transmitted with full reflection on the planed surface. Optical fiber can have this kind of infinitely many plane, so the transmission path of the optical signal will be infinite, that is, there are unlimited many modes. In this way, the transmitted fiber is called multimodular fiber.
The size of the single -mode fiber is generally 8 ~ 10um. In the single mode, the signal is spread along the line, which is a mode. The multi -mode fibrous core is relatively large, 50um or 62.5um, which can be transmitted at the same time.
Single -mode transmission bandwidth and high transmission distance are mainly used for long -distance networks such as optical fiber, subway, and roads. However, because the single -mode fiber core is relatively small, it is necessary to accurately connect to the transmitter, so as to be coupled to a higher light source. This makes the price of other accessories of single -mode optical fiber network system increased, and the price of single -mode light transmitters is much more expensive than multi -mode. When using a single -mode connector for end connection, pay attention to accurate docking, otherwise it will generate a high -value insertion loss and reduce the optical fiber transmission performance.
The multi -mode can be mainly used to meet the transmission of short -distance networks. In fact, multi -mode optical fiber can support vertical subsystem wiring and short -range building group subsystem wiring within 550 meters of the Mall of Ethernet, as well as data center wiring within 150 meters of 40G/100G network. In addition, the photoelectric conversion element of the multi -mode optical system is cheaper than the single mode, and the on -site installation and end connection are simpler.
