The invention discloses a C and L waveband
wavelength selecting switch, as well as an implementation method and a
processing unit thereof, wherein the
processing unit comprises an input-output
fiber array, a
polarization diversity element, a cylindrical surface reflector, a collimating
lens array, a
grating array and a programmable
spatial light modulator; and a C waveband input
light signal and an L waveband input
light signal enter respectively the
polarization diversity element through the input-output
fiber array for polarization state adjustment, are reflected by the cylindrical surface reflector, collimated by the collimating
lens array, expanded by the
grating array according to different wavelengths, reflected to the programmable
spatial light modulator for adjustment on magnitude and phase through the collimating
lens array and the cylindrical surface reflector, and then returned to the
grating array to be synthesized into a C waveband output
light signal and an L waveband output light
signal through the cylindrical surface reflector and the collimating lens array, and the C waveband output light
signal and the L waveband output light
signal are output through a designated output
optical fiber port after the polarization state is restored. According to the C and L waveband
wavelength selecting switch, as well as the implementation method and the
processing unit, only one programmable
spatial light modulator is used for realizing dynamic allocation of a C waveband
wavelength resource and an L waveband wavelength resource through a skillful design of a light path, the structure is simple and the
system cost is greatly reduced.