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The differences between G.657.A1, G.657.A2, G.657.B1,G.657.B2 fiber optic cables
Source: | Author:surfiber-Daisy | Published time: 2020-12-15 | 3434 Views: | Share:


The differences between  G.657.A1, G.657.A2, G.657.B1,G.657.B2 fiber optic cables


G.657 fiber bending resistance characteristic
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Compared with other single-mode fibers, the most notable feature of G.657 fiber is that it is not sensitive to bending. This means that the bending loss of G.657 fiber is relatively small. G.657 optical fiber has good bending resistance, making it suitable for optical fiber access network, including various wiring in the building where the optical fiber access network terminal is located.

 

G.657 fiber classification

According to the principle of compatibility with G.652 fiber, G.657 fiber is divided into A and B fiber. At the same time, according to the principle of minimum bend radius, the bending grade is divided into three grades, 1, 2 and 3. , Where 1 corresponds to the minimum bending radius of 10mm, 2 corresponds to the minimum bending radius of 7.5mm, and 3 corresponds to the minimum bending radius of 5mm. Combining two principles, G.657 fiber is divided into four sub-categories, G.657.A1, G.657.A2, G.657.B2 and G.657.B3 fiber. The specific classification is shown in the following table:

 

ITU-T G.657

Class A

(Requires full compatibility with G.652)

Class B

(Not required to be fully compatible with G.652)

Bending grade1 (Minimum bending radius 10mm)

G.657.A1

-

Bending grade2 (Minimum bending radius 7.5mm)

G.657.A2

G.657.B2

Bending grade3 (Minimum bending radius 5mm)

-

G.657.B3

 

The technical indicators of G.657 optical fiber key parameters are as follows: 


Characteristic

Unit

Technical index

G.657.A1

G.657.A2

G.657.B1

G.657.B2

1310nm Mode field diameter

 

(8.6-9.5)±0.4

(8.6-9.5)±0.4

(6.3-9.5)±0.4

(6.3-9.5)±0.4

Maximum macro bending cost

Bending radius

mm

15

10

15

10

7.5

15

10

7.5

10

7.5

5

Number of bending turns

-

10

1

10

1

1

10

1

1

1

1

1

1550nm

maximum

dB

0.25

0.75

0.03

0.1

0.5

0.03

0.1

0.5

0.03

0.08

0.15

1625nm

maximum

dB

1.0

1.5

0.1

0.2

1.0

0.1

0.2

1.0

0.1

0.26

0.46

Attenuation characteristics

1310nm-1625nm

dB/km

≤0.4

≤0.5

1383nm±3nm

dB/km

≤0.4

Not stipulated

1550nm

dB/km

≤0.3

≤0.3

Dispersion characteristics

Zero dispersion wavelength

nm

1300-1324

Not stipulated

Zero dispersion slope

ps/nm2.km

≤0.0.092

Partial mode dispersion characteristics

M

-

20

Not stipulated

Q

-

0.01%

PMD

Maximum

ps/km

≤0.2





400-000-0000
400-000-0000