BOADM, Blocker Based OADMs, are reconfigurable optical add/drop multiplexers (OADM) that use Wavelength Blockers
(WB) and can be configured remotely. Wavelength blockers can block entire frequency bands
or multiple wavelengths and attenuate the level of light signals. Wavelength blockers use switches in microsystem technology
or in LCoS technology.long haul links in optical wide area networks and can transmit 80 wavelength channels with a frequency spacing of 100 GHz in DWDM technology.