Differences between single-mode and multi-mode Cisco

Single-Mode Optical Fiber only has a single transmission path, which is generally used for long-distance transmission,
Multi-Mode Optical Fiber has multiple transmission paths. The bandwidth of multi-mode optical fiber is 50 MHz ~ 500 MHz/Km,
The bandwidth of a single-mode optical fiber is 2000 MHz/Km, and the optical fiber wavelength is 850nm, 1310nm, and 1550nm. The 850nm wavelength zone refers to multi-mode optical fiber communication; the 1550nm wavelength zone refers to single-mode optical fiber communication; the 1310nm wavelength zone includes multimode and single-mode; The 850nm attenuation is large, but for 2 ~ 3MILE1MILE = 1604 m. According to the fiber diameter, the optical fiber size is divided into 50 μm slow-variant multimode fiber, 62.5 μm slow-variant enhanced multimode fiber, and 8.3 μm mutant single-mode fiber, the diameter of the optical fiber package layer is 125 μM, so there are 62.5/125 μM, 50/125 μM, 9/125 μM and other different types ..

Single-mode transmission and multi-mode transmission

In optical fiber communication theory, optical fiber has single-mode and multi-mode modes. The difference is:

1. Single-Mode Optical Fiber core diameter is about 10 m), only one transmission mode is allowed, the dispersion is small, and the work is at a long wavelength of 1310nm and 1550nm), it is relatively difficult to coupling with the optical device.

2. Multi-Mode Optical Fiber Core Diameter of 62.5 m or 50 m), allows transmission in hundreds of modes, large dispersion, working at nm or 1310nm. Coupling with optical devices is relatively easy

For optical end modules, there is no single-mode or multi-mode. The so-called single-mode and multi-mode modules refer to the optical device used by the optical end module and the optical fiber to achieve optimal transmission characteristics.

There are generally the following differences:

1. The single-mode module generally uses LD or LED with narrow spectral lines as the light source. The coupling component size works well with the single-mode optical fiber. It can transmit long distances during transmission using single-mode optical fiber.

2. multimode modules generally use low-price LEDs as the light source, and the coupling component size works well with multimode optical fiber.