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. OCIS codes： 050.2230, 060.2410, 060.2430, 140.3560.
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. OCIS codes： 050.2230, 060.2410, 060.2430, 140.3560.
