Abstract
An all-optical wavelength converter with a large wavelength hopping range is proposed and demonstrated. This
converter consists of multistage cascaded wavelength converters using semiconductor optical amplifiers each with
different gain band. Each of the cascaded wavelength converters enables us to perform both noninverted (NIV) and
inverted (IV) operations. Conversion performance is compared at NIV and IV operations in terms of static
characteristics as a function of input/output power of the converter. While good conversion performances are
achieved at both operations, the IV wavelength conversion has better cascadability to obtain a high-quality
converted signal for the cascaded scheme. Moreover, signal amplitude regeneration is demonstrated by repeating the
IV wavelength conversion. Finally, we successfully demonstrate, for the first time, ultrawideband wavelength
conversion, including over 300-nm wavelength hopping to the shorter wavelength side with a triple-stage cascaded
wavelength converter.
© 2007 IEEE
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