Abstract
Numerical analysis and experimental verification of the ultra-broadband
amplified spontaneous emissions (ASEs) generated by ${\rm Cr}^{4+}{:}{\rm YAG}$ crystal fibers are presented.
Milliwatt ASE was obtained from a double-clad 25-$\mu$m-core fiber. Results of the experimental ASE power
measurements and the composition analysis using electron probe micro-analyzer
were used to determine the absorption, emission, and excited-state absorption
cross sections of pump and signal of the crystal fibers. The numerical analysis
showed that the ASE output power is improved by reducing the fiber core diameter
down to several micrometers despite of the increased consumption in excited-state
absorption of pump. A comparison of the cross sections between those in literature
and this work indicates that the crystal fiber has good crystal and optical
qualities using the laser heated pedestal growth method. The large pump absorption
of the ${\rm Cr}^{4+}{:}{\rm YAG}$ crystal fiber limits its useful length. With such short fiber length,
the ASE lights can not acquire enough gain. The ASE efficiency can be further
improved by using bi-direction and cladding pump structure to increase the
crystal fiber length and incorporating a high ASE reflector at the input end
of the crystal fiber. The ${\rm Cr}^{4+}{:}{\rm
YAG }$ crystal fiber has a potential for applying to ultra-broadband
ASE light source in wavelength division multiplexing network.
© 2008 IEEE
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