... used to combine or split 1310nm and 1550nm optical signals, which double the fiber transmission capability ... in the single fiber. It is widely used for fiber communication systems upgrading to expand the system ... ,4=others - - - Pigtail Type:0=250m, 1=900m, 2=2mm, - - - 3=3mm, 4=others - - Operating Wavelength ... - - 1315=1310&1550nm etc. - Port Number:1×2, 2×2 etc. Grade: U=Ultra,P=Perfect, A=Grade A, ...