1 meter long, 0.25 OD, 1300/1550nm SM fiber, terminated with one end stripped 10mm ± 1mm and flat cleaved 0 +/- 0.5 deg and unterminated on the other side. SP2: Flat cleaved fiber coated with dielectric coating with R= 40 % +/- 3% at 1545nm +/- 30 nm.