Standard
OS1 single-mode fiber optic patch cords comply with ITU-T G.652 standards, including ITU-T G.652.A and ITU-T G.652B standards (conventional), ITU-T G.652C and G.652D standards (low water peak). But OS2 single-mode fiber refers to the fiber that meets the fiber standard G.652C or G.652D, also called single-mode zero-water-peak fiber or single-mode low-water-peak fiber. These low-water-peak fibers are usually used in CWDM (Coarse Wave Division Use) application. In addition, the new cabling standard G.657.A1 was issued for bending-insensitive single-mode fiber optic patch cords to optimize the cost-effectiveness of fiber optic products.
Cable structure
OS1 single-mode fiber usually adopts a tight tube structure and is designed for indoor applications. It usually has a protective cover on the outside, and a bundle of flexible fiber polymer (such as aramid yarn) is wrapped in the middle. The core and cladding of the OS1 single-mode fiber are made of glass, which cannot be bent and is fragile. The coating plays a protective role and can extend the life of the fiber. OS2 single-mode fiber usually adopts loose tube design, which is more suitable for outdoor applications. When deployed in some extreme environments, a more robust cable structure is required. The OS2 single-mode fiber is helically placed in a semi-rigid tube, so the OS2 can be stretched without bending the inner fiber to prevent the fiber from being damaged under huge tension.
Attenuation value
The attenuation value of OS1 single-mode fiber is greater than that of OS2 single-mode fiber. Generally, the maximum attenuation value of OS1 single-mode fiber in the 1310nm and 1550nm bands is 1.0db/km, while the maximum attenuation value of OS2 is 0.4db/km. In addition, their transmission distances are also different. The maximum transmission distance of OS1 single-mode fiber is 10km, while the maximum transmission distance of OS2 single-mode fiber can reach 200km. Both OS1 and OS2 single-mode fibers can achieve transmission rates from 1 to 10GbE at different transmission distances. In addition, OS2 type single-mode fiber can also be used for 40G/100G Ethernet transmission.
