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Raman amplifier with raised gain resulted from wave-filtering and optical transmission system

A Raman amplifier and optical filter technology, applied in transmission systems, electromagnetic wave transmission systems, optical multiplexing systems, etc., can solve the problems of optical signal loss, excitation signal loss, etc.

Inactive Publication Date: 2006-10-11
LUCENT TECH INC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In strongly driven amplifiers, noise amplification can be large enough to cause loss of the driving signal
In addition, optical noise with a higher frequency shift than the optical signal can absorb some of the energy contained in the optical signal and cause loss of the optical signal

Method used

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  • Raman amplifier with raised gain resulted from wave-filtering and optical transmission system
  • Raman amplifier with raised gain resulted from wave-filtering and optical transmission system
  • Raman amplifier with raised gain resulted from wave-filtering and optical transmission system

Examples

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Embodiment 60

[0078] Figure 12 An embodiment 60 of the present invention is illustrated that utilizes a "mid-section" isolator that includes a high pass filter. As shown, the signal S is input to the first circulator 62 and the excitation signal P is input to the second circulator 64 . Between the first length of fiber 68 and the second length of fiber 70 is provided a mid-section isolator 66, as shown, where the isolator 66 allows reverse propagating excitation by utilizing a pair of wavelength division multiplexers 76 and 78. Signal P and signal S pass through two independent paths 72 and 74 . An optical isolator 80 is added in path 72 associated with signal S to prevent reflected portions of signal S, and optical noise, from propagating in the opposite direction. By using separate paths for the signal S and the excitation signal P, the excitation signal P is not attenuated by the isolation 80 . This isolation allows for more efficient signal amplification in the first length of fiber...

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PUM

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Abstract

The invention discloses an optical fiber Raman amplifier, comprising: a section of single-mode optical fiber, the single-mode optical fiber includes at least one predetermined wavelength λ P When excited by an optical signal, the fiber core generates stimulated emission of light by means of Raman scattering in a predetermined wavelength band, wherein the predetermined wavelength band includes at least one signal wavelength λ s ; a first means for coupling an input optical signal to said single-mode fiber segment; a second means for coupling an optical excitation signal to said single-mode fiber segment; a high-pass with a cutoff frequency slightly lower than the frequency of the lowest frequency input signal optical filter, and the high-pass filter is arranged along the direction of the single-mode optical fiber section; wherein the second device for coupling the optical excitation signal includes a plurality of optical fiber sections, and is arranged between adjacent optical fiber sections A high pass filter, an excitation signal is provided as an input to a first fiber segment of the plurality of fiber segments, and an output of a last fiber segment of the plurality of fiber segments is coupled to the single mode fiber segment.

Description

technical field [0001] The present invention relates to Raman amplifiers, and more particularly, the present invention relates to incorporating one or more high-pass filters in Raman amplifiers to increase amplifier gain and improve excitation conversion efficiency. Background technique [0002] The subject of Raman amplification is well known in the literature. Excited Raman amplification is a nonlinear optical process in which intense excitation waves are injected into a medium such as an optical fiber propagating one or more optical signals. As far as the fused silica fiber is concerned, if the frequency of the excitation wave is approximately 13THz, which is greater than the frequency of the signal wave, the excitation wave will amplify the signal wave by means of excitation Raman scattering. For example, an excitation wave with a wavelength of 1450 nanometers will amplify an optical signal with a wavelength of about 1550 nanometers. [0003] During the past few years,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02F1/39G02F1/383G02F1/35H01S3/06H01S3/067H01S3/10H01S3/30H04B10/29H04B10/294H04J14/00H04J14/02
CPCH01S3/0675H01S3/06754H01S3/10023H01S3/302H01S2301/02
Inventor 德密特丽欧斯·尼科劳·克里斯托道里德斯吉恩-马克·皮埃尔·德拉法克斯克里斯托弗·迈克尔·迈克恩托施吉恩·桃鲁斯
Owner LUCENT TECH INC
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