略語大辞典 [L] 25 LDFB lumped-distributed feedback (laser) 不均一分布フィードバック(レーザー).lumped-distributed feedback (laser); a combination of DFB(distributed feedback due to the Bragg scattering on periodic structures, gratings, in active medium) and a feedback caused by the presence of an external PPC(plane-parallel c 丸善「略語大辞典」JLogosID : 11880486