Stable picosecond soliton transmission is demonstrated numerically by use of concatenated gain-distributednonlinear amplifying fiber loop mirrors (NALMs). We show that, as compared with previous solitontransmission schemes that use conventional NALMs or nonlinear optical loop mirror (NOLM) and amplifiercombinations, the present scheme permits significant increase of loop-mirror (amplifier) spacing. The broadswitching window of the present device and the high quality pulses switched from it provide a reasonablestability range for soliton transmission. Soliton-soliton interactions can be reduced efficiently by usinglowly dispersive fibers. Stable picosecond soliton transmission is demonstrated numerically by use of concatenated gain-distributednonlinear amplifying fiber loop mirrors (NALMs). We show that, as compared with previous soliton transmission schemes that use conventional NALMs or nonlinear optical loop mirror (NOLM) and amplifiercombinations, the present scheme permits significant increase of loop-mirror (amplifier) ​​spacing. The broadswitching window of the present device and the high quality pulses switched from it provide a reasonable ability range for soliton transmission. Soliton-soliton interactions can be reduced efficiently efficiently by usinglowly dispersive fibers.