Gain-clamped erbium-doped fibre amplifier for wavelength division multiplexed systems (original) (raw)
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A Novel Gain-Clamped Erbium Doped Fiber Amplifier for Wavelength Division Multiplexed Systems
Optical Review, 2000
Amplification of multiwavelength signals by an erbium-doped fiber amplifier (EDFA) is becoming critical, due to the proliferation of wavelength division multiplexed systems. However, when a standard EDFA is employed, the dissimilarities among the signals' gain may prove unacceptable. Thus, a novel gain-clamped EDFA is proposed here to tackle the issue of gain tilt. The suitability of the configuration is then investigated through a numerical model, which is developed based on the standard EDFA and fiber laser models.
Experimental characterization of a dynamically gain-flattened erbium-doped fiber amplifier
IEEE Photonics Technology Letters, 2000
We have designed and experimentally characterized an erbium-doped fiber amplifier (EDFA) which possesses a wavelength-independent gain spectrum, independent of the operating level of the gain (dynamic gain flatness), and without requiring any gain-level-dependent control of any parameters. In the wavelength range 1542-1552 nm, the gain was flat to within the experimental uncertainties of f0.3 dB even as the gain level changed by 17 dB. The EDFA was based on a low-AI-content alumina-germanosiiicate EDF and a Mach-Zehnder filter. We believe that this type of EDFA, which has not been demonstrated before, can significantly simplify the design of amplified wavelength-division multiplexing (WDM) transmission systems and increase the robustness of long-distance WDM transmission.
Analysis of optical gain enhanced erbium-doped fiber amplifiers using optical filters
IEEE Photonics Technology Letters, 1993
The pump wavelength windows, at about 14 nm in the 980 nm band and 35 nm in the 1480 nm band, are somewhat smaller than for the single-channel case as a result of the shorter fiber length. This will impose even more severe restrictions on the wavelength and spectral stability of the 980 nm pump laser diodes.
Optically gain clamped Erbium-doped fibre amplifiers for next generation optical networks
The performance of optically gain clamped Erbium-doped fibre amplifiers is analysed in a realistic next generation network scenario. For this purpose, key design parameters and causes of transmission degradation are identified. It is demonstrated that the gain clamping technique deployed effectively reduces gain fluctuations of the amplifier due to simultaneous add/drop of bursts. Quality degradation due to gain fluctuations is shown to be time-dependent along the duration of the burst. All-optical gain clamping poses a trade-off in the amplified link performance due to the presence of a feedback channel. Feedback attenuation and wavelength must be chosen in such a way that quality of transmission remains within acceptable range with the minimum possible gain dedicated to the feedback channel.
Analytic modeling of high-gain erbium-doped fiber amplifiers
Optics Letters, 1992
We describe an analytic method that calculates accurately (within a 1.5-dB discrepancy with numerical models) the gain of an erbium-doped fiber amplifier. Amplified spontaneous emission (ASE) is taken into account so that the gain of ASE-saturated erbium-doped fiber amplifiers is calculated properly. It is effective for wavelength multiplexing (several signals) and for different pumping schemes (copropagating or counterpropagating or both).
IEEE Photonics Technology Letters, 2000
Abstruct-With the ever growing interest in Wavelength Division Multiplexing transmission systems, the need for an optical amplifier with a large bandwidth is more and more necessary. Unlike the standard Erbium-doped silica fiber amplifiers, the fluoride-based fiber amplifiers display more uniform gain spectra. The benefit expected from fluoride amplifiers with multiwavelength signals has been experimentally assessed through comparisons in single-and cascaded-amplifiers configurations. 4 dB gain flatness was achieved with four wavelength-multiplexed signals extending over 23 nm after three fluoride amplifiers while 15 dB gain unbalance was observed after three silica amplifiers. This result shows that fluoride amplifiers may be of the utmost relevance for multiwavelength transport systems.
Comparative Gain Analysis of Erbium and Ytterbium Doped Optical Fibre Amplifiers
International Journal of Computer Applications, 2014
In the present work, gain of EDFA (Erbium Doped Fibre Amplifier) and YDFA (Ytterbium Doped Fibre Amplifier) are analyzed based on their performance parameters. The effects of pump laser power, length of doped fibre that used for amplification and the wavelength of the input signal on the gains of the optical amplifiers is examined. EDFA exhibits maximum gain of 48db around 1550nm regions with pump wavelength of 980nm (pump power=10Watt, EDF length=30m), on the other hand YDFA exhibits maximum gain of 62db around 1030nm regions with pump wavelength of 975nm (pump power=5Watt, YDF length=8m). The ANALYSIS shows that the gain of YDFA is superior to that of EDFA for short fibre length.
Detailed design analysis of erbium-doped fiber amplifiers
Photonics Technology …, 1991
INTRODUCTION HE erbium-doped fiber amplifier has much potential as a T high-gain optical amplifier in optical communication sys- ... MODEL The model for the EDFA, used in the analysis, assumes that the Er3+-ions acts as a 3-level laser system when pump-ing at ...
Gain-clamped erbium-doped fiber amplifier using a single fiber Bragg grating
Microwave and Optical Technology Letters, 2001
A new design of an all-optical gain-clamped erbium-doped fiber amplifier is demonstrated. The amplifier is based on the con¨entional ring ca¨ity, where the gain is clamped at 21.84 dB¨ia optical feedback using a single fiber Bragg grating for an input signal power as high as y8 dBm. ᮊ