Fiber is a thin, flexible solid glass material, which consists of three parts of the core, the cladding, the coating composition can be used as the light conducting means.
Before we also introduced a variety of knowledge about fiber, today to share with you the type of single-mode fiber.
ITU-T Recommendation specifications Category: G.651, G.652, G.653, G.654, G.655, G.656, G.657
Wherein SMF (Single Mode Fiber) type single mode optical fiber are the following:
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Of the G.652 (non-dispersion-shifted single-mode optical fiber)
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G.653 (DSF)
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G.654 (cut-off shifted optical fiber)
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G.655 (NZDSF)
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G.656 (low slope NZDSF)
- G.657 (bending resistance fiber)
Non G.652 dispersion-shifted single-mode optical fiber
G.652 optical fiber is a conventional single-mode fiber, the cutoff wavelength of the shortest of 1550 nm can be used, but also for 1310nm.
When operating at a wavelength of 1310 nm, the fiber dispersion is small, the dispersion coefficient of the transmission distance D 0 ~ 3.5 ps / nm · km, the system only restricted by the fiber attenuation. But the loss is large, about 0.3 ~ 0.4 dB / km.
In the operating wavelength band of 1550 nm loss smaller, about 0.19 ~ 0.25 dB / km, but a larger dispersion is about 20 ps / nm · km.
Such fibers may be used to support the 1550nm band 2.5Gbps system, but because of this wavelength dispersion is large, if the transmission signal of 10Gbps, the transmission distance of over 50 km, it is necessary to use dispersion compensating module.
G.652 fiber is now more and more applications of an optical fiber, ITU-T G.652 for the optical fiber into four categories G.652.A, B, C, D.
G.652.A Fiber
Maximum transfer rate of 2.5Gbps
G.652.B Fiber
10Gbps maximum rate, the maximum rate of the transmission when the required dispersion compensation suitable for the application wavelength 1310nm / 1550nm / 1625nm, and such fiber bending loss is small, a small transmission loss.
G.652.C Fiber
G.652A properties substantially the same, but a lower attenuation coefficient at 1550nm, and 1380nm eliminate the water absorption peak nearby. It can work in the 1360nm ~ 1530nm band.
G.652.D Fiber
G.652B fiber properties substantially the same, and the same attenuation coefficient G.652C fiber, which can operate in the band 1530nm 1360nm ~. It is the most rigorous and fully backward compatible with all G.652 level indicators.
G.653 dispersion-shifted fiber
G.653 dispersion-shifted fiber (DSF, Dispersion Shifted Fiber), is based on the G.652 fiber, the zero dispersion point moves from 1 310 nm to 1 550 nm, 1 550 nm wavelength solve the dispersion of high-speed single wavelength system constraints.
This is very suitable for long-distance optical fiber, single-channel, high-speed optical fiber communication systems, such as direct opening of 20G b / s systems on such an optical fiber, dispersion compensation without the need to take any measures. However, because of the EDFA in DWDM optical power enters the optical fiber are greatly improved, four-wave mixing optical fiber nonlinear effect caused serious impact on DWDM systems in the G.653 fiber, G.653, and is not widely promotion. The main reason is the window 1 550 nm, G.653 dispersion is very small, relatively easy to produce a variety of nonlinear effects of optical networks. 
G.654 cutoff wavelength shifted fiber
G.654 optical fiber is a fiber loss is minimized at a wavelength of 1550nm, mainly used in submarine fiber optic communications require a long regeneration segment distance, but it is not a substantial increase in system capacity optical fiber, mainly used for long distance without intervening active device relaying submarine fiber optic communication systems.
G.655 NZDSF
G.655 zero dispersion shifted fiber (NZDSF, NonZero DispersionShifted Fiber) 1 550 nm window is reasonable, low dispersion, nonlinear effects can be reduced four-wave mixing and cross-phase modulation, and can support long-distance transmission, while minimizing the dispersion compensation network.
G.655 low-dispersion slope in optical fiber dispersion value 0.05 ps / nm · km or less, the dispersion in the wavelength range 1 530 ~ 1 565 nm is 2.6 ~ 6.0 ps / nm · km, 1 565 ~ 1 625 nm wavelength range the dispersion value of 4.0 ~ 8.6 ps / nm · km.
G.656 low slope NZDSF
G.656 fiber DWDM system is to further expand the available wavelength range, S (1460 ~ 1530 nm), C (1 530 ~ 1 565 nm), and L (1 565 ~ 1 625 nm) of the zero dispersion wavelength band are maintained A novel optical fiber.
G.657 bend-resistant fiber
Compared with other optical fibers G.657 single-mode fiber, the most notable feature is G.657 bend-insensitive fibers, the bending loss is relatively small.
According to whether the principle compatible with the G.652 fiber, G.657 into the class A and class B fibers, but according to the principle of the minimum bending radius, bending levels are classified into three levels 2,3.
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