{TAIL ~ The present invention} relates to an optical multi wavelength selective device, more precisely a multi wavelength selective switch for rerouting and {HEAD ~ switching} of wavelengths in an optical network, in which each wavelength may be separately rerouted 
{ TAIL ~ The present invention } relates to an optical multi wavelength selective device , more precisely a multi wavelength selective switch for rerouting and { HEAD ~ switching } of wavelengths in an optical network , in which each wavelength may be separately rerouted
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