1480 nm pumped erbium doped fibre amplifier withall optical automatic gain control

Massicott, J.F.; Willson, S.D.; Wyatt, R.; Armitage, J.R.; Kashyap, Raman; Williams, Doug; Lobbett, R.A.

doi:10.1049/el:19940660

Cited by 70 publications

(12 citation statements)

References 4 publications

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“…The equations describing the optical feedback and characterizing the input flux of the AOGC EDFA at each wavelength bin are (6) In these equations, is an external photon flux representing an WDM signal entering the cascade of EDFA's at wavelength the coupling ratio of the input coupler (IC), is power transmission of the optical bandpass filter (OBF) at wavelength and is the attenuation of the variable attenuator (VA). The optical bandpass filter effectively suppresses most of the ASE components fed back from the output to the input of the AOGC EDFA so that a lasing action occurs with being the lasing photon flux at the input of EDF number 1.…”

Section: Numerical Model Of Aogc Edfa Cascadementioning

confidence: 99%

“…A variety of methods have been proposed and demonstrated experimentally to prevent unwanted power excursions caused by channel addition/removal in concatenated fiber amplifiers. These include all-optical gain clamping (AOGC) via the construction of a ring laser [4], [5] or lasers with resonators defined by fiber Bragg gratings [6], or introduction of a control channel before the first optical amplifier in a link [7].…”

Section: Introductionmentioning

confidence: 99%

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Gain stabilization in gain clamped EDFA cascades fed by WDM burst-mode packet traffic

Karásek

Bononi

Rusch

et al. 2000

J. Lightwave Technol.

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Abstract-This paper studies via simulation the stabilizing effect of all-optical gain-clamping (AOGC) in a chain of erbium-doped fiber amplifiers (EDFA) fed by wavelength-division multiplexing (WDM) burst-mode packet traffic. AOGC is necessary to suppress swings of output power and optical signal-to-noise ratio (OSNR). A case study is selected, in which only the first EDFA in a cascade of six amplifiers is clamped using a ring laser configuration. A numerical model which solves the transcendental equation for the average inversion at each EDFA is used for the analysis. The traffic is generated on the eight WDM channels by ON-OFF time-slotted sources, with statistically independent ON and OFF durations, randomly generated by a truncated Pareto distribution with infinite variance. The simulation model includes the generation of amplified spontaneous emission within each amplifier and the propagation of the lasing power generated in the AOGC EDFA through the cascade. It is shown that the sizable power and OSNR swings arising in an unclamped cascade of EDFA's can be effectively suppressed when a lasing signal a few decibels above the aggregate signal power develops in the AOGC EDFA and propagates along the cascade.Index Terms-Modeling, optical communication, optical fiber amplifiers, transient analysis, wavelength-division multiplexing (WDM).

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Section: Numerical Model Of Aogc Edfa Cascadementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Gain stabilization in gain clamped EDFA cascades fed by WDM burst-mode packet traffic

Karásek

Bononi

Rusch

et al. 2000

J. Lightwave Technol.

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“…A second class uses an all-optical feedback lasing signal sustained by the amplifier itself, which clamps the average inversion and thus the gain to the desired level [6]- [8]. The technique is known as gain clamping.…”

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confidence: 99%

Design of gain-clamped doped-fiber amplifiers for optimal dynamic performance

Bononi

Barbieri

1999

J. Lightwave Technol.

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Abstract-This paper provides a detailed analysis of gainclamped doped-fiber amplifiers and design guidelines in a wavelength division multiplexed (WDM) networking environment. A simple dynamic model of the doped-fiber amplifier allows us to derive explicit expressions for the small-signal response, which help identify and optimize the most critical parameters for best dynamic performance. The most important parameter is the pump power, which should be chosen 1-2 dB's above its required open-loop value, with all channels present, for the required signal gain. In an all-optical networking scenario with input power per channel as high as 03 dBm the required pump power may well exceed 20 dBm. Thus optimization of other parameters such as laser wavelength and loop loss are important. For best dynamic performance either the loop loss should be extremely small, implying a very large laser flux, or the laser gain variation in response to a perturbation should be large. Accordingly, the laser wavelength should be placed either close to the unity-gain region of the clamped gain profile, or at its peak. Finally, the small signal model for a chain of clamped amplifiers is provided, and it is shown that long chains are vulnerable to low-frequency input signal perturbations.Index Terms-Doped-amplifier gain dynamics, erbium-doped fiber amplifier (EDFA), gain-clamping.

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“…The signal gain of the all-optical gain-controlled EDFA is determined mainly by the losses in the laser cavity [4], [8], [9]. These losses are dependent on the reflectivities of FBG's and insertion losses of various optical components used in the cavity.…”

Section: Resultsmentioning

confidence: 99%

“…In particular, the all-optical gain control technique utilizes laser oscillation of amplified spontaneous emission (ASE) noise to clamp the signal gain of EDFA. Thus, it can be implemented simply by using an optical bandpass filter or a pair of fiber Bragg gratings (FBG's) [3], [4]. However, this technique requires careful selection of the lasing wavelength to avoid the impairments from relaxation oscillation and spectral hole burning [7].…”

Section: Introductionmentioning

confidence: 99%

All-optical gain-controlled bidirectional add-drop amplifier using fiber Bragg gratings

Kim

Yang

Lee

et al. 2000

IEEE Photon. Technol. Lett.

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Abstract-We demonstrate an all-optical gain-controlled bidirectional add-drop amplifier (BADA) module by using two fiber Bragg gratings (FBG's). The proposed amplifier module could suppress the power fluctuation of the surviving channels within 0.2 dB even when thirteen out of fourteen channels were added or dropped. In addition, there was no degradation in the receiver sensitivity when this module was used for the bidirectional transmission of wavelength-division-multiplexing (WDM) signals.Index Terms-Automatic gain control, bidirectional transmission, optical fiber amplifier, wavelength-division multiplexing (WDM).

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1480 nm pumped erbium doped fibre amplifier withall optical automatic gain control

Cited by 70 publications

References 4 publications

Gain stabilization in gain clamped EDFA cascades fed by WDM burst-mode packet traffic

Gain stabilization in gain clamped EDFA cascades fed by WDM burst-mode packet traffic

Design of gain-clamped doped-fiber amplifiers for optimal dynamic performance

All-optical gain-controlled bidirectional add-drop amplifier using fiber Bragg gratings

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