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Method and system for controlling output response gradient

A slope, control ground technology, applied in transmission systems, electromagnetic wave transmission systems, wavelength division multiplexing systems, etc., can solve the problems of complex, expensive, and noise-increasing solutions for dynamic control gain tilt

Inactive Publication Date: 2004-12-22
JDS UNIPHASE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] While the '406 patent achieves its intended function, its solution for dynamically controlling gain tilt is complex and rather expensive
[0007] Most known solutions to correct for dynamic gain tilt have a corresponding power loss (on the order of 5dB), and additionally, the added power requires additional pumping
Another detrimental consequence of these systems is the increased noise

Method used

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  • Method and system for controlling output response gradient
  • Method and system for controlling output response gradient
  • Method and system for controlling output response gradient

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Embodiment Construction

[0023] Now refer to the attached figure 1 , shows the gain spectrum of a typical EDFA amplifier, from which it can be seen that the gain varies as a function of wavelength.

[0024] For a variety of glass substrates, optical amplifiers doped with rare earth elements (especially EDFA) can be effectively broadened uniformly, and the overlap of dopant ions and signal modes is almost independent of wavelength. Likewise, it is also possible to restrict the gain spectrum (here the small-signal gain that can be measured with a weak probe signal while the operating point of the amplifier is fixed) to a wavelength-dependent single-parameter category. Thus, if the amplifier gain at certain reference wavelengths changes due to a change in input (i.e., pump and / or signal power), the amplifier gain at other wavelengths will also vary by a predetermined amount, which May differ from the amount of gain change at the reference wavelength. The change in amplifier gain of the relevant wavelen...

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Abstract

This invention relates to invention relates to a method for filtering and a variable slope optical filter for in-line use with an optical amplifier signal. The filter has a wavelength response that is substantially linear in slope within a band of operation wavelengths of the amplifier; the filter has an amplitude response that has an opposite and counter slope as a function of wavelength to that of a gain tilt of the amplifier within the operation band of wavelengths. The filter having means of operating on polarized light. A wave plate having a predetermined thickness provides a relative polarization difference between two wavelengths of in incoming beam in a controlled manner. A polarizer receives light from the wave plate and only allows a predetermined of light to pass therethrough unattenuated and variably attenuates or substantially prevents and / or attenuates other predetermined polarizations of light to pass therethrough.

Description

technical field [0001] The present invention relates generally to controlling the slope of the output response of an amplitude-wavelength function, and more particularly, in one aspect of the invention, to a variable Gain tilt control system, there is a gain tilt over the entire waveband of the amplifier. Background technique [0002] In optical transmission systems, especially in the field of communication, optical amplifiers (especially erbium-doped fiber amplifiers) are almost universally used. Erbium-doped fiber amplifiers (EDFAs) have high polarization-insensitive gain, low crosstalk between signals at different wavelengths, good saturated output power, and a noise figure close to the fundamental limit. The excellent noise characteristics allow cascading hundreds of these amplifiers over thousands of kilometers of optical fiber. Unlike electronic repeaters, EDFAs are transparent to data rates, signal formats, and wavelengths over a limited range, which is beneficial f...

Claims

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Application Information

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IPC IPC(8): G02B6/26G02B6/34G02F1/01G02F1/09H01S3/067H01S3/10
CPCG02F1/09G02F1/093G02B6/2746G02F2203/055G02B6/2937H01S2301/04G02F1/0136H01S3/06754H01S3/10023
Inventor 程颐浩
Owner JDS UNIPHASE CORP
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