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Pulling bulk crystal into fiber is suitable for
dvice applications in optical communications because
of its structural similarity to silica fiber. Among
fiber growth techniques, the laser-heated pedestal
growth method (LHPG) was adopted. It is crucible
free and can therefore produce high-quality single
crystals. However, interface loss of the fiber is
one of the main causes of optical loss. In order to
reduce the loss, a proper method to clad the fiber
is important for high performance device. For laser
application, high-efficient Nd:YAG lasers were
demonstrated using gradient-index crystal fibers.
For ASE and optical amplifier applications, Cr4+:YAG
crystal fiber was studied due to its fluorescence
just covering the low loss window of optical fiber.
To reduce the fiber diameter and propagation loss, a
novel cladding technique, codrawing LHPG, was
developed. A double-clad fiber was successfully
grown by the technique. As much as 2.36 mW of ASE
with a bandwidth of 265 nm was demonstrated. Up to
16-dB of gross gain at 1470 nm was also achieved. It
is the first transition metal-doped fiber amplifier
in the optical communication band.
dvice applications in optical communications because
of its structural similarity to silica fiber. Among
fiber growth techniques, the laser-heated pedestal
growth method (LHPG) was adopted. It is crucible
free and can therefore produce high-quality single
crystals. However, interface loss of the fiber is
one of the main causes of optical loss. In order to
reduce the loss, a proper method to clad the fiber
is important for high performance device. For laser
application, high-efficient Nd:YAG lasers were
demonstrated using gradient-index crystal fibers.
For ASE and optical amplifier applications, Cr4+:YAG
crystal fiber was studied due to its fluorescence
just covering the low loss window of optical fiber.
To reduce the fiber diameter and propagation loss, a
novel cladding technique, codrawing LHPG, was
developed. A double-clad fiber was successfully
grown by the technique. As much as 2.36 mW of ASE
with a bandwidth of 265 nm was demonstrated. Up to
16-dB of gross gain at 1470 nm was also achieved. It
is the first transition metal-doped fiber amplifier
in the optical communication band.