Based on the double-pass double-stage configuration, a better high erbium-doped (4000ppm) amplified spontaneous
emission (ASE) configuration with an optical circulator and two (fiber loop mirror) FLMs first used together is
experimentally presented, which provides us a output power of more than 0.79dBm and a 3dB line width of 85.3 nm
ranging form 1526.017nm to 1611.317nm with the max-wave ripple reduced to 0.4dBm after 1530nm. A simulated
profile flattened to 0.4dB is gained from Optisystem 3.0, where we even get a bandwidth of 110nm while the output
power reach 3.5dBm
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