... ,Plug-in type Dual Module Power Supply. Product description FWT-1550ES Externally Modulated Optical Transmitter adopts narrow line width,low ... Based on a series of characterized optimization and technical innovation,FWT-1550EC optic transmitter can reach excellent index with flatness ≤ ... casing temperature auto-control.all the optical port for FWT-1550ES optic transmitter can be installed in the front ...