How do I select single-mode or multi-mode optical fiber in the Integrated Wiring project?

How do I select single-mode or multi-mode optical fiber in the Integrated Wiring project?

With the development of the times, copper cables will gradually exit the market and optical fiber cables will gradually become dominant. However, the types of optical fiber are single-mode optical fiber and multi-mode optical fiber. They share the advantages of optical fiber, but also have some differences. What are their advantages and disadvantages? What kind of optical fiber will we choose during integrated cabling? Next, let's take a look at it.

Generally, multi-mode optical fiber cables selected in the Integrated Wiring project are considered from the following two points:

1. From the perspective of investment, OptiSPEED (Common multimode 62.5/125) will not be used for 10 Gbit/s in at least 10 years. Because OM3 uses low-cost VCSEL and 850nm light source equipment, this greatly reduces the cost of 10 Gigabit transmission. If the distance is no more than 150 meters, LazrSPEED 150 is selected (OM2 50/125 supports 10 Gigabit 150 meters); LazrSPEED 300 is the best choice for 10 Gigabit transmission of 300 meters; lazrSPEED 550 is the best choice for 550 m 10 m transmission. If you want to transfer more than 550 m 10 m, you need to select TeraSPEED, that is, single-mode optical cable system.

2. In terms of future development trends, the horizontal cabling network speed needs to be 1 Gbit/s wide to the desktop, and the building's backbone network needs to be upgraded to 10 Gb/s bandwidth, the Campus Backbone Network must be upgraded to a bandwidth of 10 Gbit/s or 100 Gbit/s. Currently, network applications are growing at an annual rate of about 50%. It is expected that the next 5 years will reach the desktop level, which will become as common as the current MB to the desktop level, therefore, the system planning should be forward-looking. Category 6 Cabling should be considered for the horizontal part, and 10 Gigabit multimode optical fiber cables should be considered for the trunk part, in particular, the prices of 6 types of copper cables plus 10 Gigabit multi-mode optical fiber cables and 5 types of copper cables plus 1 Gigabit multi-mode optical fiber cables are less than 10 ~ About 20% of the difference, from the perspective of long-term application, such as the cost should be considered to use 6 types of copper cable plus 10G optical cable.

The selection of single-mode optical fiber cables in the Integrated Wiring project takes the following considerations:

Single Mode Fiber: the Core of the central Fiber is very small (the core diameter is usually 9 or 10 μm), and only one Mode of light can be transmitted. Therefore, the mode color dispersion is small, which is suitable for remote communication, but there are still material dispersion and Waveguide Dispersion. In this way, the single-mode optical fiber has a high requirement on the spectral width and Stability of the light source, that is, the spectral width must be narrow, good stability.

The total dispersion of a single-mode optical fiber is zero at the wavelength of 1310nm. According to the optical fiber loss characteristics, 1310nm is exactly a low-loss window of the optical fiber. In this way, the 1310nm wavelength zone becomes an ideal working window for optical fiber communication, and is also the main working band of the current practical optical fiber communication system. The main parameters of 1310nm conventional single-mode optical fiber are determined by the ITU ITU-T in G652 recommendations, so this kind of optical fiber is also called G652 optical fiber.

As mentioned above, because of the absorption effect of OH peaks (Water peaks), 900 ~ 1300nm and 1340nm ~ There is a loss peak in the 1520nm range, which is called a water peak. Currently, the TeraSPEEDTM zero-water peak single-mode optical fiber cable solves this problem. The TeraSPEED system eliminates the influence factors of the NM water peak, thus providing users with wider transmission bandwidth, users can freely use all the bands from 1260nm to 1620nm, so the transmission channel increases from the previous 240 to 400, and the performance is 50% more available than the traditional single-mode optical fiber, the TeraSPEED solution lays a solid foundation for upgrading to Gbit/s CWDM coarse wavelength division multiplexing technology in the future. The TeraSPEED solution is an ideal Backbone Optical Fiber System at the campus/city level.

We recommend that you select a single-mode optical fiber cable as follows:

1. From the perspective of transmission distance, if you want to support 10g transmission in the future, and the distance should be long, you should consider using a single-mode optical cable.

2. From the perspective of cost, the zero-water-peak optical fiber cable provides 50% more bandwidth than the single-mode optical fiber cable, and the cost is similar. In fact, the US company at present does not provide common single-mode optical fiber cables, only products with higher performance such as the zero-water-peak optical fiber are provided to users.

Select single mode or Multi mode?

Based on the above analysis, we believe that users should invest the best performance at the lowest price from the perspective of application, transmission distance, prospective, and cost!