The coexistence wavelength division multiplexing module series ( CEx WDM ) are designed for the next

generation of passive optical networks (NG-PON). The coexistence wavelength division multiplexing module is

a new type of optical access system that coexists with GPON on the same ODN. Our coexistence wavelength

division multiplexing modules, including GPON, XG-PON, NG-PON2 and OTDR, are designed to adapt to

NG-PON1 and NG-PON2 TWDM wavelengths to maximize the density and speed of optical distribution networks .

         CEx WDM module is a product in the evolution of PON technology. In a specific period, it is a transitional

product. As a next-generation PON technology solution, NG-PON2 is currently improving performance and

meeting emerging application   requirements while taking into account compatibility with existing PONs. Its the

development direction of PON technology, and it has also received great attention and extensive support from

international mainstream operators. Following this, CEx WDM module will also have a wide range of application

prospects.