Lasers, Fiber Optics, and Communications

Gain-flattened two-stage L-band erbium-doped fiber amplifier by weak gain-clamped technique

[+] Author Affiliations
Jiuru Yang

Heilongjiang University, College of Heilongjiang Province, Key Lab of Electronics Engineering, XueFu Street 74, Harbin 150080, China

Heilongjiang University, Electrical Engineering College, XueFu Street 74, Harbin 150080, China

Xiangyu Meng, Changxing Liu

Heilongjiang University, Electrical Engineering College, XueFu Street 74, Harbin 150080, China

Chunyu Liu

Heilongjiang University, College of Heilongjiang Province, Key Lab of Electronics Engineering, XueFu Street 74, Harbin 150080, China

Opt. Eng. 54(3), 036107 (Mar 18, 2015). doi:10.1117/1.OE.54.3.036107
History: Received December 29, 2014; Accepted March 2, 2015
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Abstract.  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 ±0.4dB in the range of 1570 to 1610 nm, and an 29dB average gain is simultaneously maintained.

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© 2015 Society of Photo-Optical Instrumentation Engineers

Citation

Jiuru Yang ; Xiangyu Meng ; Changxing Liu and Chunyu Liu
"Gain-flattened two-stage L-band erbium-doped fiber amplifier by weak gain-clamped technique", Opt. Eng. 54(3), 036107 (Mar 18, 2015). ; http://dx.doi.org/10.1117/1.OE.54.3.036107


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