Abstract
We propose a four-wave mixing (FWM) crosstalk measurement method for
a signal with 50 GHz spaced wavelength channels in a highly doped L-band erbium-doped
fiber amplifier (EDFA). The method uses the crosstalk measured by using a
signal with 100 GHz spaced wavelength channels. This approach is based on
analyses of the channel spacing dependence of FWM signal generation and the
effect of the gain evolution of each signal channel along the EDF during FWM
signal generation at a specific frequency. It is shown that reducing the channel
spacing from 100 to 50 GHz has little impact on the efficiency of FWM generation
if the gain evolution is the dominant term in FWM generation. It is also shown
that the contributing ratio of the gain evolution of each channel is almost
the same for the two signals. These results enable us to develop a measurement
method for estimating the FWM crosstalk in an L-band EDFA applied to a wavelength-division
multiplexing system with a 50 GHz spaced signal by using a 100 GHz spaced
signal and a compensation factor. The validity of the measurement method is
successfully demonstrated experimentally.
© 2008 IEEE
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