The design and implementation of ROADM based on the FBG optical switch (OSW) was investigated. A new fiber Bragg grating (FBG) collimator was designed, and the construction of which is introduced. The FBG optical switch (OSW), composed of FBG collimators, was the integrated package of FBG and OSW. A new ROADM, which is compacter and smaller, was designed based on FBG OSW. Having tested the ROADM and simulated the system according to the performance standards of ideal OADM, a conclusion can be drawn that the newly designed ROADM is simple in structure and easy to be operated. In addition, this new ROADM, applied with mature technology, can minimize the facture difficulties and reduce the cost.