G.652

What is G.652？

   

Standard single-mode optical fiber refers to single-mode optical fiber with zero dispersion wavelength in the 1.3μm window. The International Telecommunications Union (ITU-T) regulates this optical fiber as G.652 optical fiber. Its characteristic is that when the working wavelength is 1.3μm, the dispersion of the optical fiber is very small, and the transmission distance of the system is only limited by the attenuation of the optical fiber. However, the loss of this optical fiber in the 1.3μm band is relatively large, about 0.3dB/km~0.4dB/km; the loss in the 1.55μm band is small, about 0.2dB/km~0.25dB/km. The dispersion in the 1.3μm band is 3.5ps/nm·km, and the loss in the 1.55μm band is larger, about 20ps/nm·km. This fiber can support trunk systems for 2.5 Gb/s in the 1.55 μm band, but due to the large dispersion in this band, expensive dispersion compensation modules are required for transmitting 10 Gb/s signals over a distance of more than 50 km.

G.652 Fiber Features

  

Excellent optical performance to meet the transmission requirements of high-efficiency DWDM and CWDM systems

 

Excellent geometry for low splice loss and high splice performance

  

Excellent PMD coefficients for long and medium distances and high efficiency of transmission systems.

  

G.652 Single Mode Optical Fiber Types

  

G652 fiber can be further divided into G.652.A, G.652.B, G.652.C, G.652.D. The main difference lies in the PMD (Polarisation Mode Dispersion). A/B is the basic single-mode fiber, and C/D is the low-water-peak single-mode fiber. Among them, G652D is the most commonly used, due to its operating wavelength of 1300nm, the fiber dispersion is very small, the transmission distance of the system is only limited by the loss.

  

The difference between these four types:

  

G.652.A

G.652.A fiber supports a transmission distance of 400 km in 10 Gbit/s systems, 40 km in 10 Gbit/s Ethernet systems and 2 km in 40 Gbit/s systems. Available in five bands, D, E, S, C and L, it can operate over the entire operating wavelength range of 1260-1625 nm. Better bending performance and more precise geometries are required.

  

G.652.B

The G.652.B fiber supports a transmission distance of 3000 km in 10 Gbit/s systems and 80 km in 40 Gbit/s systems.

 

G.652.C

The properties and application range of G.652.C fiber are similar to G.652.A fiber. However, G.652.C fiber has less attenuation at 1550 nm. It can be used in the extended band (E-band) and short band (S-band) in the range of 1360-1530 nm, and in addition to being used in the 1310 nm and 1550 nm wavelength regions, the application wavelength region extends to 1360 nm to 1530 nm.

 

G.652.D

G.652.D fiber combines the advantages of G.652.B and G.652.C fibers. G.652.C is similar to G.652.A and has better performance at 1550 nm. Therefore, G.652.D pretty much covers G.652.A, G.652.B, and G.652.C. Currently, when talking about G.652 fiber, most of the time it refers to G.652.D. G.652.D fiber is widely used in many applications.

   

G.652 Fiber Applications

   

Long-distance communication: The low attenuation and low dispersion characteristics of G.652 fiber make it the first choice for long-distance fiber optic communication, and it is often used in the construction of backbone networks for metropolitan area networks (MAN) and wide area networks (WAN).

          

Access Network: It is also often used for access networks, especially for applications with high bandwidth requirements such as Fiber to the Home (FTTH).

              

Data Center Interconnect: G.652 fiber is very common for high bandwidth and low latency connectivity between or within data centers.

       

Telecom and Internet Service Providers (ISPs): G.652 fiber is a standard fiber widely used by telecom carriers and ISPs to support high-bandwidth service requirements such as 4G/5G networks, video streaming, VoIP, and other applications.

               

Enterprise Networks: Many enterprises use G.652 fiber to build their Local Area Networks (LAN) and Wide Area Networks (WAN) for more efficient communication and data transmission.