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VOLUME 77 (2003) | ISSUE 9 | PAGE 555
Effect of injection of C-band ASE on L-band erbium-doped fiber amplifier
PACS: 42.60.Da, 42.81.-i, 42.81.Wg, 42.81.Uv
Abstract
The effect of injecting conventional band (C-band) amplified spontaneous emission on the performance of long wavelength band erbium-doped fiber amplifier (L-band EDFA) is demonstrated. It uses a circulator and broadband fiber Bragg grating (FBG) to route C-band ASE from a C-band EDFA. Injection of a small amount of ASE (attenuation of 20 dB and above) improves the small signal gain with a negligible noise figure penalty compared to that of an amplifier without the ASE injection. A maximum gain improvement of 3.5 dB is obtained at an attenuation of 20 dB. At very large amounts of ASE injection (attenuation of 0 dB), the gain of the amplifier is clamped at 15.2 dB from -40 to -10 dBm with a gain variation of less than 0.3 dB. The saturation power is also increased from -8 dBm (for without ASE injection) to 2 dBm (VOA = 0 dB) with a slight noise figure penalty. These results show that the ASE injection technique can be used either for gain improvement or gain clamping in L-band EDFA.