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CWDM OADM module is a wavelength division multiplexing technology based on TFF (thin film filter), with a variety of package sizes and wavelength options; in the transmission optical path, OADM can achieve WDM signals without photoelectric conversion Uploading and downloading are one of the important equipment of key nodes in WDM optical network; the use of OADM can give play to its flexible networking, easy network upgrade and scale expansion, and is widely used in local area network (LAN), metropolitan area network (MAN) and other fields .