Hello everyone, this post will introduce you to G.652 series fiber related information.
The G.652 fiber is known as a non-zero-dispersion shift fiber (NZ-DSF). Currently, it is the most widely used fiber. The G.652 fiber has low attenuation and zero dispersion at 1310 nm operating wavelength and the lowest attenuation but a larger positive dispersion at 1550 nm operating wavelength. The ITU-T further classifies the G.652 fiber into four types: G.652A, G.652B, G.652C, and G.652D. The dispersion coefficients of these fibers are almost the same.
1. G.652A fiber
Before the ITU-T Recommendation G.652 was released, the G.652A fiber had the parameters most similar to those of the G.652 fiber (in the 1996 edition). This is because the ITU-T recommendation (including the 2000 edition) had no requirements on the polarization mode dispersion (PMD) performance of the G.652A fiber. It should be noted that the 2003 edition made requirements on its PMD. In the past, the highest transmission rate of the G.652A fiber was 2.5 Gbit/s. Now, it can reach 400 km transmission distance in a 10 Gbit/s system, 40 km in a 10 Gbit/s Ethernet system, and 2 km in a 40 Gbit/s system. The G.652A fiber supports the following information:
SDH transmission system specified by the ITU-T G.957
STM-16 single-channel SDH transmission system that has an OA, as stipulated in the ITU-T Recommendation G.691
40 km transmission distance in a 10 Gbit/s Ethernet system
40 Gbit/s transmission rate specified by the ITU-T G.693
2. G.652B fiber
Compared with the G.652A fiber, the G.652B fiber extends the attenuation requirements to the L band (1625 nm) and requires a lower PMD. The G.652B fiber can reach over 3000 km transmission distance in a 10 Gbit/s system and 80 km transmission distance in a 40Gbit/s system. The G.652B fiber supports the following information:
SDH transmission system specified by the ITU-T G.957
STM-64 single-channel SDH transmission system with OA capabilities specified by the ITU-T G.691
STM-64 WDM system with OA capabilities specified by the ITU-T G.692
STM-256 application specified by the ITU-T G.693 and G.959.1
3. G.652C fiber
The G.652C fiber is known as a low water peak or MAN-dedicated fiber. It eliminates loss peak (also called water peak) absorbed by the OH root ions near 1385 nm wavelength, which flattens the loss spectrum and adds 125 wavelength channels with a channel spacing of 100 GHz. The G.652C fiber has a similar attribute and application range with those of the G.652A fiber. However, the G.652C fiber has a lower attenuation at 1550 nm wavelength. It can be used for the extended band (E band) and short band (S band) in the range of 1360-1530 nm, which expands the available wavelength range and increases the number of WDM channels. It is a good choice for MAN applications.
4. G.652D fiber
The G.652D fiber integrates the advantages of the G.552B and G.652C fibers. It has the similar attribute and application scope with those of the G.652B fiber and requires the same attenuation with that of the G.652C fiber. The G.652D fiber can be used in the range of 1360-1530 nm (E band and S band) wavelengths. It has bright prospects in the MAN application. For details, see the Recommendation ITU-T G.652.
