Page 48 - Market Analysis Report of Optical Communications Field in China & Global market 2020

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An extremely low temperature resistant large effective

area fiber

Zhang Gonghui1,2, Li Yongtong1,2, Shen Liang1,2, Zhao Yunpeng2,
Chen Wei1,2, Dai Wenhao2, Zhang Liang2, Li Jiajun2, Shi hui2
1 Jiangsu Hengtong Optic-electric Co., Ltd., Suzhou, China
2 Jiangsu Hengtong Optical Fiber Technology Co., Ltd., Suzhou, China
Abstract
This paper studied the low temperature performance of optical fiber under extreme cold conditions, and a kind of ultra-
cold-resistant & ultra-large capacity G.654.E fiber has been developed, which applied the low temperature resistant
coating. The test results show that: The fiber transmission characteristic for 10 hours after the temperature of -70~85 oC,
the additional loss of 1310 nm and 1550 nm is no more than 0.01 dB/km. The 1550nm wavelength PMD is no more than 0.05
ps/km1/2. In addition, the additional loss of 1310 nm and 1550 nm is no more than 0.01 dB/km by 15 days at -70 oC for
constant temperature aging, and the 1550nm wavelength PMD is no more than 0.04 ps/km1/2. Fiber corrosion sensitivity
parameter Nd after aging stress is 23, and coating in microscope showed no crystallization, shedding.

Key words: low temperature resistant, large effective area, low temperature additional loss, G.654.E, low temperature
resistant coating, energy Internet.
1. Introduction
W ith the rapid development of the world economy, standards and industry standards). The research on the
extremely cold environment is even rarer, and the depth
it has been criticized all the time to human being because and breadth of the research are far from sufficient.
of went short of energy sources increasingly, and the high
pollution and energy consumption caused by traditional This article has deeply studied the theoretical analysis
energy. Therefore, it is urgent to develop a clean, green of the stress of optical fiber in different environments.
and pollution-free new energy source to deal with the Based on the application experience of other types of
energy demand of the modern society. It is well known communication optical fibers, a new type of ultra-cold-
that wind energy resources of the arctic are rich and resistant & ultra-large capacity G.654.E fiber is developed,
widely distributed, the exploitable technology is about and the temperature cycling and low temperature test of
100 billion kw—accounts for about 20% of the world's the new fiber is carried out. The variation law of additional
wind energy. With the development of the Internet of attenuation of optical fiber under different experimental
Everything (IoE), the establishment of a global energy conditions is explored. This research lays a foundation for
Internet has gradually entered the public's awareness; safe and reliable operation of optical fiber in extremely
the optical fiber communication system is an integral cold environment.
part of power transmission system. The G.654.E optical
fiber is more and more in people's graces because its 2.Influence Factors
long distance and large capacity transmission advantage 2.1Internal Stress
popular. However, the natural environment of the Arctic is The doping technology is widely used to make the core
harsh, and the minimum temperature in winter can reach layer of the optical fiber at present. The characteristic
-70 °C. In this extremely cold environment, exceedingly absorption attenuation and Rayleigh scattering of the
high requirements are imposed on the low temperature optical fiber will change correspondingly in the low
resistance of optical fibers. temperature environment. Meanwhile, the core layer, the
cladding layer, the cladding layer and the coating layer
Domestic mainstream optical fiber manufacturing all generated the corresponding additional stress, which
companies have made a series of breakthroughs in the caused the additional attenuation of the fiber to change
research and development of low-loss and large-area correspondingly.
optical fiber. The typical G.654 fiber is mostly used
in the field of marine communications at present, but The main factors causing additional stress are as follows:
the application of land trunks is inexperienced, and (1) Axial compression strain caused by large difference in
the problems in the product design and development thermal expansion coefficient between optical fiber and
process have not been fully exposed. What is more worth coating layer;
mentioning is that most of the research on the relationship (2) Lateral pressure changes between the fiber core and the
between fiber attenuation and temperature is biased cladding layer.
towards high temperature; less attention has been paid to
aging. However, the research results for the attenuation From the microscopic perspective, the total force balance
characteristics of optical fiber at low temperatures are less equation as shown in equation 2-1, which applied to
[1]
and basically stop at -40 oC (according to current national determine the deformation amount of optical fiber (W) :
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