Feed-Forward Control of Transient Gain Dynamics of an EDFA for Optical Burst Networks

Cho, Jeong-Sik; Cho, Minjae; Won, Yong Hyub

doi:10.4218/etrij.07.0207.0082

Cited by 4 publications

(7 citation statements)

References 4 publications

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“…Also, transients create problems in optical burst switching networks due to the abrupt power changes in EDFA input power. A feed‐forward method to suppress the EDFA transients is discussed in .…”

Section: Introductionmentioning

confidence: 99%

An investigation on transient effects in EDFA with variable duty cycle and wavelength multiplexed signals

Dasan

Thodiyil²,

Francis³

et al. 2014

Micro & Optical Tech Letters

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Fusion splicing photonic crystal fibers and conventional single-mode fibers: Microhole collapse effect, J Lightwave Technol 25 (2007), 3563-3574. 21. B.D. Tiburcio, G.M. Fernandes, and A.N. Pinto, Extremely smallcore photonic crystal fiber fusion splicing with a single-mode fiber, ABSTRACT: The advent of erbium doped fiber amplifiers (EDFA) has revolutionized optical communication in the past few decades. Traditionally, it was being used with relatively high bitrates system for amplification in the optical domain. The slow gain response of EDFA is inherently resistant to transient effects from bit rate and duty cycle variations in high bit rate optical systems. We investigate the transient effects of EDFA on low bitrate systems with variable duty cycle and pump power configurations. Also, the effect of transients in WDM multirate systems has been investigated. The work is supported with both simulation and experimental results. V C 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:352-356, 2015; View this article online at wileyonlinelibrary.com.

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Section: Introductionmentioning

confidence: 99%

An investigation on transient effects in EDFA with variable duty cycle and wavelength multiplexed signals

Dasan

Thodiyil²,

Francis³

et al. 2014

Micro & Optical Tech Letters

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“…Such signal power transients (which occur when channels are turned on/off or rerouted) can cause several undesirable phenomena, such as large bit-error-rate and relaxation oscillations. Automatic gain control (AGC) of EDFA can be either electronic [2][3][4][5][6][7][8][9][10][11][12][13][14]o r all optical [15][16][17][18]. In general, electronic AGC is considered a low cost and long-term reliable procedure, but has difficulty following the gain dynamics because of relatively large-time constants of electronic circuits and EDFA amplifier gain dynamics.…”

Section: Introductionmentioning

confidence: 99%

“…Our approach utilises the electronic AGC technique that combines both feedback and feedforward control of EDFA. Feedforward control of EDFA was considered in different set-ups in [12][13][14].…”

Section: Introductionmentioning

confidence: 99%

“…None of the AGC schemes [2][3][4][5][6][7][8][9][10][11] is comparable to the one presented in this paper since none of them has the feedforward controller. Similarly, the AGC schemes [13,14] use only feedforward without feedback controllers. In [12], both feedforward and feedback controllers were designed, but its feedback controller is a simple proportional controller in contrast to the feedback controller presented in this paper that has integral action with the corresponding observer used for estimation of the average inversion level.…”

Section: Introductionmentioning

confidence: 99%

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Non‐linear integral control of photon power transients in optical communication networks with erbium‐doped fibre amplifiers

Radisavljević-Gajić¹

2014

IET Circuits, Devices & Systems

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In this study the authors present a novel technique for control of signal power transients caused by signal add/drops in optical communication networks with erbium-doped fibre amplifiers (EDFAs). The approach utilises the electronic automatic gain control that combines both feedback and feedforward control of EDFA. Feedback control is non-linear integral control and feedforward control is a steady-state gain scheduling technique. The feedback non-linear control requires information about the average inversion level that is obtained via a simple linearised first-order observer. The scheduling variable used is the nominal pump power needed to keep the average inversion level at the desired value at steady state and the input signal powers given at particular wavelengths. In the simplified gain scheduling version, the scheduling variable is the total input signal power. Simulation examples indicate that the proposed controller completely eliminates at steady state the photon power transients caused by signal add/drops with the steady state being reached within a few milliseconds.

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“…The fabric noise has been analyzed by cross-sectional shapes of fibers, fiber type, and weaves to calculate objective factors affecting them [6][7][8]. In addition, the subjective sensations and the physiological responses to fabric sounds have been reported [9][10][11][12]. In these researches, they have used a constant frictional speed (0.04 m/s) to generate fabric noises, and reported that LPT (level pressure of total sound) values of fabric sound for various fabrics such as cotton, silk, wool, and nylon ranged from 34 dB to 62 dB.…”

Section: Introductionmentioning

confidence: 99%

Characteristics of sounds generated from vapor permeable water repellent fabrics by low-speed frictions

2008

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To investigate the sound properties by low-speed frictions (0.2 m/s and 0.5 m/s) which occur when two fabrics are rubbed by wearer's slow movement, six specimens are selected by cluster analysis among seventy-one vapor permeable water repellent fabrics for outdoor sportswear. Their sound spectra are obtained from the FFT analysis. Physical sound properties (LPT, ΔL, Δf) and Zwicker's psychoacoustic parameters -loudness(Z), sharpness(Z), roughness(Z), and fluctuation strength(Z) -are calculated from the sound spectra. Mechanical properties of the fabrics are measured with the KES-FB system. The amplitudes of the sound spectra of all the specimens at 0.5 m/s are higher than those at 0.2 m/s throughout the entire range of frequencies. As the frictional speed changed from 0.2 m/s to 0.5 m/s, the LPT increases about 16 dB, and the loudness(Z) and fluctuation strength(Z) increase about 3 times and 2 times, respectively. The SMD and Weight at the two low frictional speeds are the important factors which affect the sound properties of vapor permeable water repellent fabrics.

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Feed-Forward Control of Transient Gain Dynamics of an EDFA for Optical Burst Networks

Cited by 4 publications

References 4 publications

An investigation on transient effects in EDFA with variable duty cycle and wavelength multiplexed signals

An investigation on transient effects in EDFA with variable duty cycle and wavelength multiplexed signals

Non‐linear integral control of photon power transients in optical communication networks with erbium‐doped fibre amplifiers

Characteristics of sounds generated from vapor permeable water repellent fabrics by low-speed frictions

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