Page 44 - Market Analysis Report of Optical Communications Field in China & Global market 2019

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3.1 Key parameters connected with the existing network optical fiber,
G.654.E standard applicable to land has been determined with small joint loss, and the maintenance mode and
in Y2016. From the parameters comparsion in Table 1, maintenance habits need not to change.
G.654.E fiber has relatively moderate mode field diameter,
broader attenuation and more strict macro bending loss 3.3.Project case
index. Larger mode field diameter can significantly reduce The country’s major telecom operators are also constantly
nonlinear effect, but the larger the diameter of the mode exploring the next generation of fiber for future 400G and
above systems.
field, the bending property of the fiber will be affected.
So compromise, G.654.E optical fiber with mode field China Unicom has established the world’s first land trunk
diameter of 12.5±0.5 micron, and about 130 micron line with a large effective area of G.654.E fiber optic line
effective area can significantly improve the OSNR system, in Y2016. This project was carried out in the eastern trunk
and also has good bending performance ,adapting to the line network and the western trunk line network. The east
complex and changeable land cable laying environment. Jinan - Qingdao section of Shandong province, optical
cable length was about 430km, and the transmission
Table 1 ITU-T G.654 standard performance of 400G system was tested and verified on
the current network. The western test network is the Hami
- Balikun section of Xinjiang, the length of the optical
cable about 150km, fully verified the stability of G.654.E
optical fiber and cable in long-term operation under harsh
environment .
[4]
China Mobile Beijing-Nanjing main cable adopts G.654.
E optical fiber from YOFC, with a total length of 1,539.6
km, which is the longest G.654.E land optical cable
main line in the world. The test emphasis on verification
key indicatorslink including loss of optical cable links
, cable loss and splicing loss of G.654.E and G.652.D
laid in the current network, and performance of multi-
For fiber attenuation, combined cost consideration, for span 100G/200G/400G hybrid system of the two fibers.
G.654.E fiber with about 130 square micron effective Test results show that, compared to G.652.D cable loss,
area, cable attenuation below 0.18dB/km is a reasonable G.654.E cable loss can improve 0.02dB/km in average
indicator, which both has the advantages of low attenuation as expected. Each transmission performance core index
coefficient and high cost performance. has been improved correspondingly for G.654.E cable
in 100G/200G/400G hybrid system. Under the premise
of G.654.E fiber optic cable network cross-section
From the above, G.654.E fiber, with effective area about configuration and guarantee the standard margin, for the
130 square micron and cabled attenuation below 0.18dB/ first time, the single carrier 400G 16QAM achieves a
km, is the first choice for the next generation of long transmission distance of more than 600km, Single carrier
distance optical fiber for land transmission. 200G 16QAM code over 1000km transmission distance,
200G QPSK code over 1500km transmission distance,
3.2 Splicing performance which means G.654.E fiber already has commercial
Mode field diameter(MFD) mismatch is the most impact capability [5,6] .
factor of splicing loss . The bigger the MFD mismatch, the
larger the splicing loss. In practical engineering, most of Through the test and comprehensive evaluation of the
the application scenarios in cable link are the same G.654. existing network by China Mobile and China Unicom, the
E fiber fusion, and it’s worth noting that self splicing G.654.E fiber with large effective area and low attenuation
performance of ultra low loss fiber with Aeff -130μm2 is characteristics has been identified as the best choice in the
0.02dB in average, while 0.03-0.04dB for G652.D fiber self industry to support the next generation of ultra-high-speed
splicing.At both ends of the cable link, the optical cable long-distance and large-capacity transmission.
needs to be terminated when entering the machine room. In
order to meet the existing communication equipment and 3.4 G.654.E help the interconnection of cloud data
optical module matching, G.652.D fiber jumper is generally centers.
used for terminating. Thus, optical fiber fusion of G.654.E G.654.E fiber can support longer unrepeatered
and G.652.D is required to be spliced together at both ends trasnsmission distance. It will help users locate data
of the link. There are only two spling points in cable link centers in areas where land is cheap or renewable energy
and the splicing loss Aeff 130μm2 with standard fiber is is abundant, providing a wider range of locations for data
0.15dB in average. centres, reducing the cost of building data centers and
achieving the goals of clean energy. At the same time, the
Importantly, G.654.E optical fiber can be effectively interconnection of cloud data centers will increase the
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