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Method for uniformizing gain spectrum of Raman erbium dosed oplical fiber amplifier

A fiber amplifier and erbium-doped fiber technology, applied in optics, instruments, nonlinear optics, etc., can solve the problems of increased insertion loss, reduced performance, and power waste of amplifiers, and achieve increased amplification bandwidth, reduced internal insertion loss, and noise. good performance

Inactive Publication Date: 2007-05-09
秦献华
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For GFF manufacturers, the deeper and steeper the curve, the more difficult it is to design, the more difficult it is to produce and monitor, so the cost is higher, and the product characteristics such as error function and additional loss are worse; while for For GFF users, GFF has poor substitutability, high price, and reduced performance
In particular, even if the GFF performance is unchanged, power is wasted due to an increase in the insertion loss inherent in the amplifier, and noise characteristics are degraded

Method used

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  • Method for uniformizing gain spectrum of Raman erbium dosed oplical fiber amplifier
  • Method for uniformizing gain spectrum of Raman erbium dosed oplical fiber amplifier
  • Method for uniformizing gain spectrum of Raman erbium dosed oplical fiber amplifier

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Embodiment Construction

[0032] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0033] For RAMAN fiber amplifiers, the pump light of a single wavelength can only effectively amplify the signal light within a limited wavelength range of about 40nm, and the frequency difference between the signal light and the pump light is 13THz, compared to the International Telecommunications Union (ITU- For the standard wavelength of T), that is, the place where the wavelengths are separated by about 100nm achieves the maximum gain. Figure 5 shows the distribution of RAMAN gain factors. The ordinate is the gain factor, which is proportional to the gain, and the abscissa is the frequency difference between the pump light and the signal light.

[0034] Selecting the pump light of a specific wavelength for the RAMAN fiber amplifier will amplify the signal light of a specific band. Figure 6 shows the gain spectrum of a single-pump...

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Abstract

The method includes the following steps: a) turning gain spectral line of erbium-doped fibre amplifier over and shifting it to position scope of Raman fibre amplifier gain spectral line in equal ratio translation, setting the traslated gain spectral line as target curve; b) according to the target curve, accuracy reguirement and cost to set pumping number for the Raman fibre amplifier; c) according to the target curve, accuracy requirement and the pumping number obtained from setp b) to set wavelength and power value for each pumping; d) according to results of step b) and c) to regulate the Raman fibre amplifier.

Description

technical field [0001] The invention relates to a combined structure technology of Raman and erbium-doped optical fiber amplifiers, in particular to a method for realizing gain spectrum equalization of the combined structure of Raman and erbium-doped optical fiber amplifiers. Background technique [0002] Existing optical network systems have used optical amplifiers as relay units to amplify the attenuated signals after optical fiber transmission, so that the signals can be transmitted to the next level. Affected by the noise characteristics of the optical amplifier itself, the signal-to-noise ratio of the signal will deteriorate to a certain extent after each stage of optical amplification. Considering the requirements of the signal-to-noise ratio at the receiving end, when the signal-to-noise ratio deteriorates to a certain Electrical relay for signal regeneration. [0003] The traditional optical network relay unit is composed of erbium-doped fiber amplifier (EDFA). The ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B10/17G02F1/39H04B10/12H04B10/294
Inventor 林东
Owner 秦献华