Reducing Wavelength Conversion Range in Space/Wavelength Switches

Wavelength converters with a wide conversion range are usually technologically infeasible. The limit of conversion range introduces new constraints in the construction of space/wavelength switches. In this letter, we show how we can reduce the wavelength conversion range without compromising the nonblocking properties. We use the space/wavelength switches that are based on the wavelength band converters to illustrate our technique.