Journal of Optics

, Volume 33, Issue 3, pp 181–186 | Cite as

Effect of Recycling a Backward Ase on Performance of Double Pass L-Band Edfa

  • S. W. Harun
  • H. Ahmad


A new double pass long wavelength band erbium-doped fibre amplifier (L-band EDFA) with a further improved gain is demonstrated using an un-pumped erbium-doped fibre (EDF) section. The wasted conventional band (C-band) backward amplified spontaneous emission (ASE) is used as a secondary pump source for the un-pumped EDF. A gain enhancement of 2 to 3.5 dB was observed without degradation in noise figure for the configuration where only the reverse propagated signal enters the un-pumped EDF. A high gain enhancement as high as 16 dB was observed especially at low pump powers for the configuration where the signal propagates twice through the un-pumped EDF. However, it degrades the noise figure severely.

Key words

erbium dopedfibre optical amplifier L-band EDFA double pass EDFA backward ASE 


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Copyright information

© Optical Society of India 2004

Authors and Affiliations

  1. 1.Department of PhysicsUniversity of MalayaKuala LumpurMalaysia

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