18 March 2015 Gain-flattened two-stage L-band erbium-doped fiber amplifier by weak gain-clamped technique
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The gain flatness of an L-band erbium-doped fiber amplifier (EDFA) is still an open issue. We improve the conventional single-pass two-stage configuration by placing a fiber Bragg grating (FBG) with the center wavelength at 1529.4 nm. Then, a weak lasing resonance cavity is formed by this FBG and a fiber isolator, which is able to increase the pump conversion efficiency by reflecting the residual amplified spontaneous emission and compressing the raised gain around 1570 nm based on the gain-clamped effect. The experimental results show that by adopting the proposed scheme, the gain un-flatness of the L-band EDFA is controlled within ±0.4  dB in the range of 1570 to 1610 nm, and an ∼29  dB average gain is simultaneously maintained.
© 2015 Society of Photo-Optical Instrumentation Engineers (SPIE)
Jiuru Yang, Jiuru Yang, Xiangyu Meng, Xiangyu Meng, Changxing Liu, Changxing Liu, Chunyu Liu, Chunyu Liu, } "Gain-flattened two-stage L-band erbium-doped fiber amplifier by weak gain-clamped technique," Optical Engineering 54(3), 036107 (18 March 2015). https://doi.org/10.1117/1.OE.54.3.036107 . Submission:

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