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Optical Transceiver
Optical Fiber Introduction
Home Optical Fiber Introduction

The difference between G652,G657A,G655 and G654

  • December 30. 2019
Optical fiber is the core transmission medium in fiber optic communication systems, data centers, and broadband access networks. There are various types of optical fibers, and many people get confused when checking goods or selecting cables. I was in a mess when checking goods.It took a long time to check it out, and afraid to make mistake. In order to make customers to learn more about the optical cable, briefly summarize the difference between common optical cables.

Optical cables are engineered to meet strict optical, mechanical, and environmental performance standards for reliable long‑term operation. Optical cables are made to meet the optical, mechanical or environmental performance specifications.It is a communication cable assembly that can be used individually or in group. Active Optical cable is the main transmission tool of various information network in the society.

Optical cable is consist of core, coating and jacket.
Core: Higher refractive index, for transmitting light;
Coating: Lower refractive index, form a total reflection condition with core;

Jacket: High strength, can bear greater impact, protect optical fiber.

Understanding the structure and performance of each fiber type helps you choose the right optical fiber for FTTH, data center interconnection, long‑haul transmission, and submarine communication.


Common optical fiber and differences:


G652: Standard single mode fiber, zero dispersion point is in 1300nm,divides into G652A,B,C,D.The main difference is PMD. It’s feature is that the fiber dispersion is very small when working wavelength is 1300nm, the transmission distance of the system is only limited by the loss. G652 is the most widely used standard single‑mode fiber for terrestrial communication, enterprise networks, and carrier transmission systems.

G657A: Available in D, E, S, C and L5 wavebands. It can work in the whole working wavelength range of 1260-1625nm. With excellent bending performance and the technical requirements of geometric size are more accurate. G657A is the preferred fiber for FTTH (Fiber To The Home) projects due to its high bending resistance and small size.

G655: Non zero dispersion-shifted fiber (NZ-DSF) contains 655A,B,C; The main characteristic is that the dispersion of 1550nm is close to zero, but not zero. It is an improved dispersion-shifted fiber to suppress four-wave mixing. G655 fiber is ideal for DWDM long‑haul transmission systems to avoid nonlinear effects.

G654:Ultra low loss optical fiber, mainly used for transoceanic optical cable. The common core is pure SiO2,while the ordinary ones need to be doped with germanium. The loss near 1550nm is minimum, only 0.185dB/km, the dispersion is relatively large,a bout 17～20 ps/(nm·km), But the dispersion is zero in the 1300nm wavelength region. G654 fiber supports ultra-long‑distance submarine and backbone transmission with minimal signal attenuation.

We can see from above that their difference on fiber types, dispersion and loss.

Whether you need indoor optical fiber, optical patch cord, or optical cables for data centers and telecom networks, choosing the correct fiber type ensures stable and efficient transmission.


Learn more about the product information, welcome to visit our website,we will update the blog every week. www.etulinktechnology.com.



Last updated: March 25, 2026



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