Abstract
A numerical model for the analysis and design of S-band erbium-doped
fiber amplifiers has been developed. The model is able to accurately predict
the amplifier performances by taking into account the amplified spontaneous
emission suppression due to the bending, as well as leakage losses of the
fiber used as active medium. The model has been validated by comparing numerical
and experimental data of bending loss, amplifier gain, and noise figure of
an S-band optical amplifier based on a depressed-cladding erbium-doped fiber.
A good agreement has been verified by varying fiber bending radius, input
signal power, and wavelength. The model has been then applied to the optimization
of the amplifier performances for wavelength-division multiplexer applications.
The numerical results show that 20–25 dB gain can be achieved over a
25–30 nm range centered in a different part of the S-band from 1460
to 1525 nm, just by changing the bending radius and the length of a depressed-cladding
fiber.
© 2008 IEEE
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