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Optical Fiber Cable with AllWave ® Fiber

1.

INTRODUCTION

With the recent growth of information transmission implementations represented by FTTH (Fiber To The Home),
optical fiber networks such as the metro and subscriber
networks continue to expand. Against this background,the AllWave fiber is gaining wide attention because it has
reduced the absorption loss due to OH-groups at around1380 nm in conventional single-mode fibers.
This report introduces a slotted core optical fiber cableusing AllWave fiber we have recently developed.

2.

FEATURES OF ALLWAVE FIBER

2.1

Reduced OH-Group Absorption Loss for WideBandwidth
Conventional single-mode fibers suffer from an adverse
phenomenon such that the attenuation increases at wavelengths near 1380 nm due to the absorption by OH-groups
in the fiber. On the other hand, AllWave fiber features
reduced attenuation at these wavelengths, resulting fromthe OH-group removal done during the course of fiber
manufacturing. See Figure 1. Thus, the fiber can be usedover a wide wavelength band of 1280 nm to 1625 nm.
2.2 Conformity to ITU-T Recommendation G.652
Regardless of its wide bandwidth as described above,
AllWave fiber has general characteristics equivalent tothose of conventional single-mode fibers, thus conforming
to ITU-T Recommendation G.652. See Table 1.
0.8

Therefore, the fiber can be used in the same way as forconventional single-mode fibers in such applications as
the combined uses with existing transmission lines andtransmission line facilities.

3.

OPTICAL FIBER CABLE USING ALLWAVE FIBER

3.1 Cable Structure
AllWave fiber with such characteristics as mentionedabove has been used in a slotted core optical fiber cable,
which is expected to have wide applications in the metroand subscriber networks. See Figure 2 for a typical cablestructure. The polyethylene-made slotted core of the cablewith a strength member at its center accommodates anumber of fiber ribbons of AllWave fiber in its plural slots.

Table 1

Characteristics of AllWave fiber.
ItemValue

MFD diameter@1310 nmAttenuation@1310 nm
@1383 nm
@1550 nm@1625 nmµm

8.8 ~ 9.6

dB/km

≤ 0.34≤ 0.31≤ 0.21≤ 0.24nm

1302 ~ 1322

ps/nm2 • k m≤ 0.092

Zero dispersion wavelenthZero dispersion slope

Strength member

30.0

20.0
SMF

0.4

10.0

0.2

0.0
AllWave

0.01200

1300

1400

1500

1600

Dispersion (ps/nm • km)

Attenuation (dB/km)

SMF and AllWave
0.6

Slotted core

Wrapping-10.01700

Fiber ribbon

Wavelength (nm)Figure 1

Comparison of AllWave fiber with conventional SMF.

Rip cord

Figure 2†AllWave® is a registered trademark of OFS Fitel.

JacketCross section of slotted core optical fiber cable. (300fiber type)

Furukawa Review, No. 23

2003

117

Optical Fiber Cable with AllWave ® FiberTable 2

Characteristics of slotted core optical fiber cable with AllWave fiber. (300-fiber type)
Item

Test conditions

Cable performance@1310 nm< 0.35 dB/km@1380 nm< 0.31 dB/km@1550 nm< 0.21 dB/km@1625 nm< 0.23 dB/km

Attenuation
Transmission
characteristics——< 0.1 ps/√ km

Polarization mode dispersion

JME method

Temperature characteristics-30°C~+70°C

1550 nm< 0.05 dB/km

1700 N

1550 nm< 0.01 dB

1700 N / R250 mm / 135° 1550 nm< 0.01 dB

TensileSqueezing
Mechanical

Bendingcharacteristics

Lateral force

R10 D✕10 cycles

1550 nm< 0.01 dB

980 N

1550 nm< 0.01 dB

Impact1 kg✕1 m

1550 nm< 0.01 dB

Twist

± 90°

1550 nm< 0.01 dB

The cable has a wrapping of water absorption tape andthe like over the core and is sheathed with polyethylene. Awide range of fiber count accommodated is available up to1000 fibers maximum, permitting a suitable selection ofcable adapted to applications.

For more information, please contact:
Engineering Dept., OptCom Div.
TEL: +81-3-3286-3440
FAX: +81-3-3286-3190

3.2 Cable Characteristics
The characteristics of slotted core optical fiber cable using
AllWave fiber are equivalent to or better than those of thecable with the same structure using conventional singlemode fibers. See Table 2. It is seen that the cable characteristics reflect one of the features of AllWave fiber, a low
attenuation at around 1380 nm, thereby realizing a wide
wavelength bandwidth.

Furukawa Review, No. 232003118