Table 1:
Thermal expansion coefficients (per degree Celsius) for common glass dopants used in conventional optical fibres.
Dopant
𝛼
(
×
1
0
−
6
/
m
o
l
%
)
P
2
O
5
1.3
G
e
O
2
0.7
B
2
O
3
0.7
F
−
0
.
0
2
T
i
O
2
−
1
.
0