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Proceedings Paper

Fast gain-transient recovery of cascaded EDFAs in WDM networks using a disturbance observer with a PID controller
Author(s): Seoyong Shin; Sungchul Kim; Sungho Song
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Paper Abstract

We propose a new method of minimizing the gain-transient recovery time of wavelength-division-multiplexing (WDM) signals in cascaded erbium-doped fiber amplifiers (EDFAs) in WDM network as the gain of signals in EDFA fluctuates due to channel add/drops. To minimize the gain-related errors at the receivers, the gain of the signal should be recovered back to its original level as fast as possible. In this paper, we have applied, for the first time in our knowledge, the wellknown control theory of disturbance observer technique to the control of gain-transient recovery of cascaded EDFAs. We have used a disturbance observer to detect and compensate the gain variations due to WDM channel add/drops. While the major compensation of the gain is performed by the disturbance observer, the fine control process for exact gain recovery is done by a proportional/integral/differential (PID) controller. The proposed gain control algorithm for EDFA was implemented by MATLAB and the performance of the technique was verified by simulations for the cases of different numbers of cascaded EDFAs in WDM networks. For simulation, we have used a commercially available numerical modeling software package such as the OptsimTM. Simulation results show that the technique decreases the amount of gain-transient recovery time to less than 3μsec in all the cases. This amount of gain recovery time is just about 1% of the one for commercial WDM EDFAs in these days.

Paper Details

Date Published: 18 November 2008
PDF: 6 pages
Proc. SPIE 7138, Photonics, Devices, and Systems IV, 71380P (18 November 2008); doi: 10.1117/12.817989
Show Author Affiliations
Seoyong Shin, Myongji Univ. (Korea, Republic of)
Sungchul Kim, Myongji Univ. (Korea, Republic of)
Sungho Song, Hallim Univ. (Korea, Republic of)

Published in SPIE Proceedings Vol. 7138:
Photonics, Devices, and Systems IV
Pavel Tománek; Dagmar Senderáková; Miroslav Hrabovský, Editor(s)

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