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Minimizing gain transient dynamics by optimizing the erbium concentration and cavity length of a gain clamped EDFA

P. S. Chan and H.K. Tsang

Open Access Open Access

Abstract

Erbium doped fiber amplifier (EDFA) gain transient dynamics are studied in the context of their application in optically reconfigurable networks. We address the question of how to design the EDFA in order to minimize the gain transients present in the output signals of the EDFA when the system is optically reconfigured such that the total average input power levels and wavelengths are changed. Both experimental measurements and theoretical simulations show that the amplitude transients depend on the length of the erbium doped fiber (EDF) and the erbium concentration. We show how it may be possible to reduce the gain transients by appropriate design of the EDFA.

©2005 Optical Society of America

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Figures (8)
Fig. 1.
Fig. 1. Gain transient crosstalk of gain-clamped EDFA with different EDF lengths while 8 out of 16 channels are dropped stabilized EDF.

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Fig. 2.
Fig. 2. Schematic of gain clamped configuration: Feedback loop (top) and Reflective cavity (bottom).

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Fig. 3.
Fig. 3. Gain transient crosstalk of gain-clamped EDFA with feedback loop (left column) and FP cavity (right column) while 8 out of 16 channels are dropped. Erbium concentrations in m-3 are indicated at the top right.

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Fig. 4.
Fig. 4. Power excursion of surviving channels under a gain-clamped EDFA with feedback loop (left) and FP cavity (right) under different erbium concentrations in m-3. 8 out of 16 channels are dropped under various gain levels.

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Fig. 5.
Fig. 5. Schematic setup for transient gain dynamic measurement with forward-pumping reflective cavity gain-clamp configuration.

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Fig. 6.
Fig. 6. Measured gain saturation crosstalk due to add/drop channels in WDM network with 13.5 meters EDF (21uW/div; 100us/div).

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Fig. 7.
Fig. 7. Measured gain saturation crosstalk due to add/drop channels in WDM network with 1.8 meters high-doped EDF (50uW/div; 500us/div).

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Fig. 8.
Fig. 8. Optimised EDF lengths for maximum output gain under different erbium concentration and constant pump power.

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