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Numerical studies on time-domain responses of on-off-keyed modulated optical signals through a dense fog

Urachada Ketprom1, Yasuo Kuga, Sermsak Jaruwatanadilok

  • 1Department of Electrical Engineering, PO Box 352550, University of Washington, Seattle, Washington 98195, USA. uketprom@u.washington.edu

Applied Optics
|January 23, 2004
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Phase-lag controllers are widely used in control systems to improve stability and reduce steady-state errors. A dimmer switch controlling the brightness of a light bulb serves as a practical example of phase-lag control, gradually adjusting the bulb's brightness. Mathematically, phase-lag control or low-pass filtering is represented when the factor 'a' is less than 1.
Phase-lag controllers do not place a pole at zero, but instead influence the steady-state error by amplifying any finite,...