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| Home > Manufactured Products > Adhesives >NTT Adhesives |
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Features
Conventional adhesives for optical path bonding of
optical communication devices produce adverse effects such
as noise, because they have a different refractive index
from that of optical fibers or other optical devices,
resulting in reflection at bonded interface.
The refractive index of this adhesive can be adjusted
between 1.45 and 1.57 (  ) with }0.005
accuracy by altering the fluorine content, which is able to
eliminate such adverse effects. Being a single component of
low viscosity, the adhesive is mixing-free and quickly cured
at room temperature under UV irradiation, thus ensuring fast
adhesion. In addition, this bonded area is hardly affected
by heat or moisture and is highly durable. |
Main properties of Optical
Adhesive for bonding optical waveguide
(Custom Adjusted Refractive Index Adhesive, Low Tg type,
High Tg type) |
Type (Main Components) |
Low Tg type (Epoxy) |
High Tg type (Epoxy) |
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Custom Adjusted
RI Adhesive,
High Tg Type
|
GA700 L |
Custom Adjusted
RI Adhesive,
Low Tg Type |
GA700 H |
Conditions |
External appearance |
transparent |
transparent |
transparent |
transparent |
Viscosity (cP) [23 ] |
200~560 |
250 |
370~740 |
252 |
Curing |
Curing Time (min) |
10 *1 |
10 *1 |
10 *1 |
10 *1 |
Shrinkage during curing (%) |
4~8 |
4 |
3~5 |
3 |
Properties after curing |
Controllable range of Refractive index
(0.005
accuracy) |
1.45~1.56
(@) |
1.445
(@1550nm) |
1.46~1.57
(@) |
1.445
(@1550nm) |
Optical transmittance (%)
[ = 1.3 m,
1mm] |
86~90 |
94 |
89~90 |
93 |
Adhesion Strength (kgf/cm2)
[Glass] |
 200
|
>200 |
120~ 180 |
94 |
Hardness (Shore D) [25] |
23~43 |
44 |
78~82 |
78 |
Glass Transition Temperature () |
49~67 |
49 |
130~137 |
138 |
Thermal expansion coefficient
(  ) |
8~11 |
14 |
6c9 |
9 |
| (Note)
*This property data is a measured value on samples instead
of the guaranteed value.
**Special tuning of refractive index ; Controllable range
by0.001
can be available upon customer's request.
Recommended curing process :
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| *1 UV irradiation : 10mW/cm2 (365nm) Heat treatment : 60 ~
100 for 1~2h
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Applications: |
For bonding light-passing areas such as one optical fiber
to another optical fiber, or an optical fiber to an optical
device. At present, further applications optical modulation
units, PLC optical devices (splitters, couplers) are being
studied. |
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