| Low noise gain-clamped L-band erbium-doped fiber amplifier by utilizing fiber Bragg grating |
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| 作者姓名： | 王天枢 郭玉彬 闫红伟 王宇航 王珂 |
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| 作者单位： | College of Communications Engineering Jilin University Changchun 130012，College of Communications Engineering Jilin University Changchun 130012，College of Communications Engineering Jilin University Changchun 130012，College of Communications Engineering Jilin University Changchun 130012，College of Communications Engineering Jilin University Changchun 130012 |
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| 摘 要： | A novel gain-clamped long wavelength band (L-band) erbium-doped fiber amplifier (EDFA) is proposed and experimented by using a fiber Bragg grating (FBG) at the input end of the amplifier. This design provides a good gain clamping and decreases noise effectively. It uses two sections of erbium-doped fiber (EDF) pumped by a 1480-nm laser diode (LD) for higher efficiency and lower noise figure (NF). The gain is clamped at 23 dB with a variation of 0.5 dB from input signal power of -30 to -8 dBm for 1589 nm and NF below 5 dB is obtained. At the longer wavelength in L-band higher gain is also obtained and the gain is clamped at 16 dB for 1614 nm effectively. Because the FBG injects a portion of backward amplified spontaneous emission (ASE) back into the system, the gain enhances 5 dB with inputting small signal.
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