FBT COUPLER Dual Window Wideband Coupler Specifications: (Based on 50/50) Parameter Premium A Grade Parameter Premium A Grade Parameter Premium Parameter Premium A Grade Wavelength Operating 1310 & 1550 nm +A40Grade nm Operating Wavelength 1310 & 1550 nm + 40 nm 1310 &1310 1550&nm + 40 Wavelength Operating 1550 nmnm + 40 nmdB Wavelength Operating Loss Loss (Max) < <3.6 Insertion < 3.8 3.8 (Max) Insertion dB 3.6dB < dB < 3.8 dB Loss (Max) < 3.6 dB Insertion < 3.8 dB Loss (Max) < 3.6 dB Insertion Uniformity (Typical) < <0.7 < 1.0 1.0 dB dB Uniformity (Typical) 0.7dB dB < < 1.0 dB Uniformity (Typical) < 0.7 dB < 1.0 dB Uniformity (Typical) < 0.7 dB ReturnReturn Loss Loss 1x2 dB 1x2>>55 55dB dB 2x2 2x2 >> 65 65 dB ReturnReturn Loss Loss 1x2 > 55 1x2dB > 552x2 dB> 65 2x2dB > 65 dB < <0.15 PDL PDL < 0.20 0.20 dB dB 0.15dB dB < 0.20