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The lateral emission of erbium-doped fiber was measured directly by two CCD detectors.It was found that the lateral intensity of green upconversion and 1.5μm spontaneous emission depended on the length of EDF when the EDF is pumped by a 980 nm laser diode with or without signal.A simple model was used to simulate experimental results and an excellent agreement was observed that indicates that in EDF or EDWA measuring the lateral emission intensity is a promising non-destructive method to investigate the amplification process.