What Is G.651,G.652,G.653,G.654,G.655,G.656 And G.657 ? - LinkedIn

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These are the standard types of optical fibers specified by ITU:

G.651 is a multimode optical fiber.

G. 652 is a regular single-mode optical fiber with zero dispersion point at 1300 nm, which is the smallest dispersion. According to PMD, it can be divided into G. 652A, B, C and D.

G. 653 is a dispersion-shifted fiber (DSF) with a zero dispersion point of 1550 nm. The principle is to shift the dispersion through waveguide dispersion, so that the low loss and zero dispersion are at the same wavelength. But at the same time zero dispersion is not conducive to multi-channel WDM transmission, because when the number of multiplexed channels is large and the channel spacing is small, a kind of non-linear optical effect called four-wave mixing (FWM) will be produced, which makes two or three transmission wavelengths mix together and produces new and harmful frequency components, resulting in crosstalk between channels. If the dispersion of the optical fiber line is zero, the interference of FWM will be very serious; if there is a little dispersion, the interference of FWM will be reduced. In view of this phenomenon, scientists have developed a new type of optical fiber, NZ-DSF.

G. 654 fibers are ultra-low loss fibers. They are mainly used in transoceanic cables. The core of G. 654 fibers is pure silicon dioxide, while the common core of G. 654 fibers is germanium-doped. The loss near 1550 nm is the smallest, which is only 0.185dB/km, but the dispersion in this region is larger, about 17-20 ps/[nm*km] and zero at 1300 nm.

G. 655 fiber is a non-zero dispersion displacement fiber (NZ-DSF), which is divided into 655A, B and C. Its main characteristic is that the dispersion of 1550 nm is close to zero, but not zero. It is an improved dispersion-shifted fiber to suppress four-wave mixing.

G. 656 optical fiber is the future guiding optical fiber. The working wavelength of G 656 increases significantly, including S, C and L bands (1460 to 1625 nm).

G.657 Optical Fiber, ITU-T of the International Telecommunication Union issued the standard recommendation of "Characteristic of Bending Loss Insensitive Single-mode Optical Fiber and Optical Cable for Access Network" in December 2006, namely G.657 Optical Fiber Standard. G.657 fibers are divided into A and B fibers. According to the principle of minimum bendable radius, the bending grades are divided into 1, 2 and 3 grades, of which 1 corresponds to the minimum bending radius of 10 mm, 2 corresponds to the minimum bending radius of 7.5 mm and 3 corresponds to the minimum bending radius of 5 mm. Combining these two principles, G.657 optical fibers are divided into four subcategories, G.657.A1, G.657.A2, G.657.B2 and G.657.B3.

Difference

1. Single-mode transmission distance is longer

2. Bandwidth of multimode transmission is larger

3. Single mode does not disperse and its quality is reliable.

4. Single mode usually uses laser as light source, which is expensive, while multimode usually uses inexpensive LED.

5. Single-mode price is higher

6. Multimode is inexpensive and transmission in short distance is better

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Share 17 5 Comments Amir Aly

Aviation Safety Performance Specialist , Optical Fiber Instructor . LAN, Data Center & FTTH Expert. CNS Engineer and Egypt CNS/SG Focal Point

1y

• Report this comment

2. Bandwidth of multimode transmission is larger i think a revision is needed here

Like Reply 1 Reaction Kassaye Mulatu

Design Technician at Ethio Telecom

2y

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in single mode fiber, what are the consequences if one type fiber is spliced with another

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