Not like traditional in-line attenuator made of fused coupling technology, Lambda Photonics in-line attenuator uses attenuation fiber technology to achieve bidirectional continuous and more accurate attenuation result. Features: 1) Attenuates continuously and precisely from 1240nm ~ 1620nm 2) Bidirectional 3) Attenuation accuracy: +-0.5dB (under 10 dB); +-10% (over 10 dB) 4) Low PDL 5) Low return loss 6) UPC and APC polishing optional 7) FC, SC, ST, LC, MU, MT-RJ, D4, E2000 connector optional