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Multistage fibre amplifier and method for adapting a pump power of a multistage fibre amplifier

A fiber amplifier, pump power technology, applied in multi-level optical transmission, lasers, laser parts and other directions, can solve the problems of signal gain fluctuation, etc., and achieve the effect of improving amplifier function, small insertion attenuation, and improving noise figure

Active Publication Date: 2009-01-07
XIEON NETWORKS SARL
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AI Technical Summary

Problems solved by technology

Thus, for example, at the input of the multistage amplifier, significant gain fluctuations of the signal to be amplified occur at the input signal power drop of 16 dB.

Method used

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  • Multistage fibre amplifier and method for adapting a pump power of a multistage fibre amplifier
  • Multistage fibre amplifier and method for adapting a pump power of a multistage fibre amplifier
  • Multistage fibre amplifier and method for adapting a pump power of a multistage fibre amplifier

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Embodiment Construction

[0030] exist image 3 The block diagram shown in corresponds in principle to the block diagram shown in FIG. 1 b of a two-stage fiber amplifier with a pump splitter in which the supplied optical signal SIG is amplified. The output signal of the laser diode LD at an emission wavelength of, for example, 980 nm is fed to the pump beam splitter PS, where the total pump signal is divided according to a predetermined division factor. The first part A1 of the total pump signal or the first pump signal is sent to the first amplifier fiber EDF1 through the pump input end of the first wavelength selective coupler WDM1. The additional pump power part A2 is fed to the pump input of the second coupler WDM2 of the second amplifier fiber FDF2 via an additionally inserted and erbium-doped fiber ZFED in the pump path. The shown two-stage fiber amplifier is connected to the conditioning unit R. This can be gain or output power regulation. For regulation purposes, a photodiode PD connected to ...

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Abstract

The invention relates to a multistage fibre amplifier having a first amplifying fibre (EDFI) and at least one further amplifying fibre (EDF2) connected in series, and also a pump source (2D), a first pump signal (AI) being fed to the first amplifying fibre (EDFI) and a further pump signal (A2) being fed to the further amplifying fibre (EDF2). The multistage fibre amplifier is distinguished by the fact that the further pump signal (A2) is fed to the further amplifying fibre (EDF2) via a power-dependent attenuation element (ZFED). The attenuation element (ZFED) is formed in such a way that, as the pump power increases, small further pump signals are attenuated to a greater extent than large further pump signals. The power-dependent attenuation of the pump signal (A2) fed to the further amplifying fibre primarily results in improvements in the noise figure of the multistage amplifier.; A method for adapting the pump power of the multistage fibre amplifier according to the invention is furthermore specified. This involves a modified feedforward control which advantageously compensates for the delays brought about by the additional fibre on changes in the input signal power. An improved dynamic behaviour of the multistage fibre amplifier is achieved by means of the method according to the invention.

Description

technical field [0001] The invention relates to a multistage fiber amplifier according to the preamble of claim 1 and a method for matching the pump power of a multistage fiber amplifier according to the preamble of claim 9 . Background technique [0002] In optical long-distance communication networks, fiber amplifiers are usually used for signal amplification, and the amplifying fibers are mostly doped with elements from the rare earth group. Commercially, Erbium-doped fiber amplifiers (English "Erbium doped fiber amplifiers", abbreviated as EDFAs) are mainly used, and these fiber amplifiers are usually composed of multiple amplification stages. In the following, the part of the EDFA is referred to in each case as an amplification stage, wherein this part contains exactly the connected erbium-doped fiber, which is arranged between passive components such as variable attenuation elements, dispersion-compensating fibers or isolators (Isolatoren) between. [0003] Various a...

Claims

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Application Information

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IPC IPC(8): H01S3/067H04B10/17H04B10/291
CPCH04B10/291H04B2210/003H01S3/06758H01S3/094003H01S3/094061
Inventor L·拉普
Owner XIEON NETWORKS SARL
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