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Technical article

January 2017

50

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values at -40°C, at 1,310nm and 1,550nm

wavelengths respectively.

After the test, attenuation changes of

all fibres are really small and no visual

damage to the cable sheath has been

found.

5 Conclusion

When

micro-duct

air-blown

cables

are used in cold areas, the influence

of freezing condition on optical fibre

transmission should be taken into

consideration. In order to study this

subject, two experiments are designed to

evaluate such influence.

Based on the test results in this paper, it

can be concluded that the effects of frozen

water on micro-duct air-blown cables are

insignificant.

However, the long-term effect during the

cable lifetime should be also considered

and further investigated. Thus, protective

measures to avoid the penetration of

water into micro-ducts should not be

ignored.

n

6 References

1 IEC 60794-1-22 Optical fibre cables – Part 1-22:

Generic specification – Basic optical cable test

procedures – Environmental test methods

2 IEC 60794-5-10 Optical fibre cables – Part

5–10: Outdoor microduct optical fibre cables,

microducts and protected microducts for

installation by blowing

Paper courtesy of the 64

th

IWCS Technical

Symposium, Atlanta, Georgia, USA, October

2015.

Yunfang Ruan, Zhuang Xiong,

Xiaoli Liu, Wenjing Ye

State Key Laboratory of Optical Fibre

and Cable Manufacture Technology,

Yangtze Optical Fibre and Cable Joint

Stock Co Ltd, and Huawei Technologies

Co Ltd

Shenzhen, Guangdong, China

Wuhan, Hubei, China

Tel

: +86 27 67887520

Email

:

xiongzhuang@yofc.com

Figure 5

:

Water frozen around end caps

Figure 6

:

OTDR graphs of the fibre with the largest

attenuation values at -40ºC during the end cap test