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Erbium doped fibre amplifier technology continues to progress at an astonishing rate with thousands of commercial systems now in routine service around the globe. Fibercore Limited offers a range of three erbium-alumina co-doped fibres, each designed to enable EDFA designers and manufacturers to satisfy the Communication Industry’s ever-increasing demands for bandwidth and output power.
Fig. 1 shows different amplifier layouts opened in the workspace. It is possible to calculate and perform various operations on these layouts using the Layout Editing tools and facilities available from the graphical interface.
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Fig. 1: EDFA_Design Lite general view.
Supported applications include single and multi-stage amplifiers for single-channel or WDM networks, gain-clamped amplifiers, L-Band amplifiers, linear fiber lasers, and broadband sources. These applications can be accessed from the eight different samples available in the Tutorial or by opening one of the eight different available Templates. New projects can be created using the Templates and changing the features of the elements displayed in the layout
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Fig. 2: ASE spectra and table results observed in the sample L-Band amplifier project file.
A self-contained graphical user interface controls the optical component layout and netlist, amplifier model, and presentation graphics. A template library with active and passive components is provided with realistic, wavelength-dependent, insertion losses and return losses. Parameter loops allow the user to investigate how specific device specifications affect the amplifier performance. The adjustable functionality enables a variety of users, such as optical component and gain block manufacturers, WDM and CATV system designers, network operators, and researchers to accelerate their design processes.
The heart of the software is a rapid numerical solver for the rate equations and propagation equations for signals, pumps, and amplified spontaneous emission (ASE). The multi-level program structure allows the designer to work at the level of the full solution for detailed device design.
The numerical solver presents three different models to perform the calculation that includes the Giles model. The selected model is embodied in the encrypted fiber provided by the fiber manufacturer, as shown in Fig. 3.
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Fig. 3: Models selection available in the EDF_Editor.
Fiber manufacturers, the exclusive distributors of EDFA_Design Lite version, provide the fiber specifications to their customers which have been encrypted using EDF_Editor. The encrypted information includes Er doped fiber parameters as cross-sections or Giles parameters, geometrical parameters, Concentration Quenching parameters and calculations algorithms.
The fiber black-box displayed to the software/fiber user in the Lite version is in Fig.4. The fiber length and calculation parameters can be modified for the calculations.
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Fig. 4: Black-box fiber properties displayed to the software/fiber user
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