Design of EDFA Gain Controller based on Disturbance Observer Technique

Authors: Seong-Ho Song, Ki-Seob Kim, Seon-Woo Lee, Seop-Hyeong Park

Abstract:

Based on a theoretical erbium-doped fiber amplifier (EDFA) model, we have proposed an application of disturbance observer(DOB) with proportional/integral/differential(PID) controller to EDFA for minimizing gain-transient time of wavelength -division-multiplexing (WDM) multi channels in optical amplifier in channel add/drop networks. We have dramatically reduced the gain-transient time to less than 30μsec by applying DOB with PID controller to the control of amplifier gain. The proposed DOB-based gain control algorithm for EDFA was implemented as a digital control system using TI's DSP(TMS320C28346) chip and experimental results of the system verify the excellent performance of the proposed gain control methodology.

Keywords: EDFA, Disturbance observer, gain control, WDM.

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1059481

References:

[1] 1. J. L. Zyskind, et al., Fast power transients in optically amplified multiwavelength optical networks, Proc. OFC'96, (1996), Paper PD31.
[2] 2. M. Zirngibl, Gain control in erbium-doped fiber amplifiers by all-optical feedback loop, Electron. Lett., vol. 27, no.7, pp. 560-561, (1991).
[3] 3. S. Y. Park, H. K. Kim, S. M. Kang, G. Y. Lyu, H. J. Lee, J. H. Lee, and S. Y. Shin, A gain-flattened two-stage EDFA for WDM optical networks with a fast link control channel, Optics Communications, vol. 153, no.1, pp. 23-26, (1998).
[4] 4. S. Shin, D. Kim, S. Kim, S. Lee, S. Song, A novel technique to minimize gain-transient time of WDM signals in EDFA, J. Opt. Soc. Korea, vol. 10, no. 4, pp. 174-177, (2006).
[5] 5. S. Kim, S. Song, and S. Shin, Theoretical analysis of fast gain-transient recovery of EDFAs adopting a disturbance observer with PID controller in WDM network, J. Opt. Soc. Korea, vol.11, no.4, pp.153-157, (2007).
[6] 6. Y. Choi, W. K. Chung, and Y. Youm, Disturbance observer in framework, IEEE IECON, pp. 1394-1400, (1996).
[7] 7. B. K. Kim, H. T. Choi, W. K. Chung, and I. H. Suh, Analysis and design of robust motion controllers in the unified framework, Journal of Dynamic Systems, Measurement, and Control, vol. 124, pp. 313-321, (2002).
[8] 8. S. Shin, J. Park, S. Song, A novel gain-clamping technique for EDFAin WDM add/drop network, (2003) Sept.8-10, Benalmadena, Spain.
[9] 9. E. Desurvire, Erbium-doped fiber amplifiers, John Wiley & Sons, New York, (1994)