... red light source (650nm) is optional for fiber trunk diagnostics in the on-field testing. KEY FEATURES1.High stability of ... Surging Range ±0.04dB @room temperature within 15min Fiber Trunk Diagnostics 650nm red light, output power >2dBm Output ports 2 port ... Information SLS640 Series SLS-6401310nm/1490nm/1550nm, 650nm for fiber diagnostics SLS-640AFrom –50 ~ +26dBm dynamic range SLS-640B1310nm/1550nm ...