Multimode fiber type and application

Classification of multimode fiber According to the standard ISO/IEC 11801 specification, multimode fiber is divided into five categories: OM1, OM2, OM3, OM4, and OM5, all of which are graded index multimode fibers. In the comparison of outer diameters, "OM" stands for optical multi-mode, that is, optical mode, which is the standard for multimode fiber to indicate fiber grade.

Multimode Fiber Parameters

Bending ability

There are many transmission modes in multimode fiber, which brings about the problem of fiber bending resistance. When the optical fiber is bent, the high-order mode is easy to leak out, resulting in signal loss, that is, the bending loss of the optical fiber. With more and more indoor application scenarios, the wiring of multimode optical fibers in narrow environments also puts forward higher requirements for their bending resistance. Comparison of bending performance of five optical fibers,

Attenuation coefficient

Optical fiber attenuation value (also known as attenuation coefficient) is one of the most important characteristic parameters of multimode optical fiber. It determines the relay distance of multimode optical fiber to a large extent. Factors decide. fiber. The attenuation values of the five commonly used multimode fibers are affected by factors such as loss, impurity absorption, and whether the material is uniform.

Full injection bandwidth and link length

Traditional OM1 and OM2 multimode fibers are based on LED (Light Emitting Diode) light sources in terms of standard and design, while OM3 and OM4 are optimized on the basis of OM2 and are also suitable for LD light sources. (Laser Diode Laser Diode) Transmission; Compared with OM1 and OM2, OM3 has higher transmission rate and bandwidth, and the performance of OM4 is better than OM3.

OM5 patch cables are optimized during the fiber preform manufacturing process, so they can support higher bandwidths. There is no difference in structure from OM3 and OM4 fiber jumpers, so it is completely backward compatible with traditional OM3 and OM4 multimode fiber jumpers. With the continuous iterative upgrade of technology, the full injection bandwidth of multimode fiber continues to increase, and the link length is also different. The attenuation coefficient and link length of five commonly used multimode fibers are compared.

With the continuous improvement of application requirements, multimode fiber is developing towards the direction of low bending loss, high bandwidth, and multi-wavelength multiplexing.