Effect of injection of C-band ASE on L-band erbium-doped fiber amplifier
Document Type
Article
Publication Date
1-1-2003
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 or 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 for gain clamping in L-band EDFA.
Keywords
C-band ASE, L-band erbium-doped fiber amplifier
Divisions
fac_eng,PHYSICS
Publication Title
Journal of Experimental and Theoretical Physics Letters
Volume
77
Issue
9
Publisher
Springer Verlag (Germany)