Method and device for inhibiting stimulated Brillouin scattering based on multiple frequency phase modulation

A technology of stimulated Brillouin and phase modulation, applied in the field of optical communication, can solve the problems of low efficiency, low degree of suppression, poor stability, etc., and achieve the effects of high efficiency, low modulation voltage and high stability

Inactive Publication Date: 2009-10-28
于健伟
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Problems solved by technology

[0004] The present invention provides a stimulated Brillouin scattering based on multi-frequency phase modulation to solve the problems of low suppression degree, low effi

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  • Method and device for inhibiting stimulated Brillouin scattering based on multiple frequency phase modulation
  • Method and device for inhibiting stimulated Brillouin scattering based on multiple frequency phase modulation
  • Method and device for inhibiting stimulated Brillouin scattering based on multiple frequency phase modulation

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specific Embodiment approach 1

[0012] Specific implementation mode one: see Figure 1 to Figure 4 , the method of this embodiment consists of the following steps:

[0013] Step 1. Input the pumping light generated by the distributed fiber laser 1 with a narrow linewidth of 1550.12nm into the multi-frequency phase modulator 2 for modulation to obtain modulated light with three equal amplitudes or five equal amplitudes;

[0014] Step 2, the modulated light is split by the optical isolator 3, and then 1% of the modulated light is output by the first coupler 4 of 1:99, and its spectrum is measured by the confocal scanning F-P interferometer 5;

[0015] Step 3: Another beam of modulated light output by the first coupler 4 is divided into two beams by a 1:1 second coupler 6, and one beam of modulated light is input to the first detector 7, and the input fiber of the modulated light is measured. Power P;

[0016] Step 4: Another beam of modulated light output by the second coupler 6 enters the single-mode fiber ...

specific Embodiment approach 2

[0024] Specific implementation mode two: see figure 1 , the device of this embodiment consists of a fiber laser 1, a multi-frequency phase modulator 2, an optical isolator 3, a first coupler 4, an F-P interferometer 5, a second coupler 6, a first detector 7, and a second detector 8. An optical circulator 9 and a single-mode optical fiber 10 are formed. The multi-frequency phase modulator 2, the optical isolator 3 and the first coupler 4 are all sequentially arranged on the emission optical path of the fiber laser 1, and the F-P interferometer 5 is arranged on the first coupling On the first outgoing optical path of the device 4, the second coupler 6 is arranged on the second outgoing optical path of the first coupler 4, the first detector 7 is arranged on the first outgoing optical path of the second coupler 6, and the optical circulator 9 is arranged on the second outgoing optical path of the second coupler 6 , the second detector 8 is arranged on the reverse outgoing optical...

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Abstract

The invention relates to a method and a device for inhibiting stimulated Brillouin scattering based on multiple frequency phase modulation, in particular to a method and a device for inhibiting stimulated Brillouin scattering through a multiple frequency phase modulation method in an optical fiber system, aiming at solving the problems of smaller inhibition degree, lower efficiency and poorer stability of the prior method for inhibiting the stimulated Brillouin scattering. Pumping light is split after being modulated, the spectrum of a first output beam is measured, a second light beam is split, and the centripetal fiber power P of the split first light beam is measured; and the second light beam enters a single mode optical fiber through an optical circulator and the power P SBS is measured. A multiple frequency phase modulator, an optical isolator and a first coupler are all arranged on an emission light path of a single mode laser, an F-P interferometer and a second coupler are respectively arranged on two emergence light paths of the first coupler, a first detector and the optical circulator are respectively arranged on two emergence light paths of a second coupler, a second detector is arranged on a reverse emergence light path of the light circulator, and the single mode optical fiber is arranged on an emergence light path of the light circulator.

Description

technical field [0001] The invention relates to the field of optical communication, in particular to a method and device for suppressing stimulated Brillouin scattering through a multi-frequency phase modulation method in an optical fiber system. Background technique [0002] There are many nonlinear effects in optical fibers, such as stimulated Brillouin scattering (SBS), stimulated Raman scattering (SRS), four-wave mixing, self-phase modulation, cross-phase modulation, etc. Among them, stimulated Brillouin scattering is a nonlinear effect that transfers the optical power of the forwardly transmitted optical signal to the backward scattered light and phonon field. The stimulated Brillouin scattering effect is related to other nonlinear effects in optical fibers. Effect comparison, has the lowest threshold power, and thus is most likely to occur. The stimulated Brillouin scattering effect causes the loss of signal light, leading to a decrease in the optical signal-to-noise ...

Claims

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Application Information

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IPC IPC(8): H04B10/18H04B10/16H04B10/2537
Inventor 于健伟
Owner 于健伟
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