• Gain-clamping techniques in two-stage double-pass L-band EDFA

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    • Keywords


      Gain clamping; optical amplifier; L-band EDFA; two-stage EDFA; double-pass EDFA

    • Abstract


      Two designs of long-wavelength band erbium-doped fiber amplifier (L-band EDFA) for gain clamping in double-pass systems are demonstrated and compared. The first design is based on ring laser technique where a backward amplified spontaneous emission (ASE) from the second stage is routed into the feedback loop to create an oscillating laser for gain clamping. The gain is clamped at 18.6 d B from -40 to -80 dBm with a gain variation of less than ±0.1 dB and a noise figure of less than 6 dB. Another scheme is based on partial reflection of ASE into the EDFA, which is demonstrated using a narrowband fiber Bragg grating. This scheme achieves a good gain clamping characteristic up to -12 dBm of input signal power with a gain variation of less than ±0.3 dB from a clamped gain of 22 dB. The noise figure of a 1580 nm signal is maintained below 5 dB in this amplifier since this scheme is not based on lasing mechanism. The latter scheme is also expected to be free from the relaxation oscillation problem.

    • Author Affiliations


      S W Harun1 N Md Samsuri2 H Ahmad2

      1. Faculty of Engineering, Multimedia University, Jalan Multimedia, Cyberjaya, Selangor - 63100, Malaysia
      2. Photonics Laboratory, Department of Physics, University of Malaya, Kuala Lumpur - 50603, Malaysia
    • Dates

  • Pramana – Journal of Physics | News

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