... + / -20nm Standard-NC (tube) Tree structure Stainless steel tube 1x2 optical coupler, SM, single window, standard-NC ... 9/125um, tree structure, 1310 or 1550±20nm, stainless steel sleeve (Φ3*54mm), Φ0.25mm bare fiber, 1m ... high return loss. All-optical structure. Stainless steel sleeve.Electrical Performance Item UnitSpecificationStandardWavelength FlattenedBroadband Center Wavelengthnm1310 or 15501310 ...