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A rod of core glass is placed inside a
tube of cladding glass.
The end of this assembly is
heated; both glass are softened and a
fibre is drawn.
Rod and tube are usually 1 m long.
The core rod has typically a
30 mm diameter. The core glass and
the cladding glass must have
similar softening temperatures.
This method is relatively easy: you just
need to purchase the rod and the
tube.
However, one must be very careful not
to introduce impurities between the core
and the cladding.