Abstract
We theoretically investigate the quantum defect between pump and signal photons in ytterbium-doped
fiber lasers and amplifiers, and find that this can be as low as 0.6%. We find that the lowest quantum defects
can be achieved with a low area ratio between the pump and signal waveguide of a double-clad fiber, and with
high-brightness pumping in the core being an ultimate approach. The change in achievable quantum defect is small over
a relatively large range of pump wavelengths, but it is still necessary to optimize the wavelengths and match the
fiber length to reach the smallest quantum defect.
© 2013 IEEE
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