Optical fiber distributed polarization crosstalk rapid measurement device based on optical frequency domain interference

Abstract

The invention belongs to the technical field of optical fiber measurement, and particularly relates to a distributed polarization crosstalk rapid measurement device based on optical frequency domain frequency shift interference, which comprises a tunable laser source module, a to-be-measured device module, a main interferometer module, an auxiliary interferometer module and a signal acquisition and analysis module. The device is characterized in that a tunable laser is used for carrying out rapid wavelength scanning, a main interferometer is used for carrying out frequency shift on an interference beat frequency signal, and the position and intensity of polarization crosstalk are respectively determined by obtaining the optical path difference between coupling light and transmission light and the amplitude of a normalized interference signal. And meanwhile, the problem of signal aliasing caused by 1 / f flicker noise at a low frequency and light source sweep frequency nonlinearity is also eliminated. The tunable laser is combined to get rid of dependence on an optical path scanning delayer in polarization crosstalk measurement, an all-fiber structure without moving parts is realized, the reliability and stability of a test system are enhanced, and the speed and signal-to-noise ratio of polarization crosstalk measurement are greatly improved in principle.

Description

Technical field

[0001] Design of the present invention belongs to the field of optical measurement techniques, particularly to optical frequency domain interferometry based on the Fiber Distributed fast polarization crosstalk measuring means. Background technique

[0002] Polarization maintaining fiber, also known as high-birefringence fiber, the fiber linear birefringence increased by adding artificial stress manner, in order to remove the effects of random polarization introduced by the optical fiber perturbation brought about by the external environment, and thus has to maintain and control the polarization effect . Attach figure 2 He described the panda-type polarization maintaining fiber cross-sectional schematic view, comprises two orthogonal axes of different refractive index characteristics, two stress rods and a core, wherein the core deliberately enlarged to clearly among the light beam. Panda type PM fiber is embedded during manufacture two stress rods on both sides of...

Examples

specific Embodiment approach 1

[0050] 1 1, a distributed polarizing string rapid measurement device of Y waveguide, such as attached Figure 4 Indicated.

[0051] Composed of the tunable laser source module 1, the device module 2, the auxiliary interferometer module 3, and the signal acquisition analysis module 4, wherein:

[0052] 1) The tunable laser source module 1 outputs a linear frequency modulation continuous light 501, and injects the first coupled device 502 from the first couplen input terminal 502 to two beam light;

[0053] 2) The light beam output by the first coupler first output terminal 502c is injected into the device module 2 in which the polarizer 202 is passed, the polarizer output terminal tail 203, the first connection point 204, the device input end tail The fiber 206, the second connection point 205, the Y waveguide pending device 206Y, the third connection point 207, the device output terminus 106b, the fourth connection point 208, the detector input end tail 509, the detector 210 Afterw...

specific Embodiment approach 2

[0069] DETAILED DESCRIPTION 2, a distributed polarizing strut rapid measurement device of a fiber optic ring, such as attached Figure 5 Indicated.

[0070] The selection of the primary photoelectric device of the invention and its performance parameters are as follows:

[0071] 1) The tunable laser source module 1 is a narrow line wide tunable laser capable of continuous wavelength scanning, the wavelength tuning range is 1510 nm to 1620 nm, turning on high coherent mode, the light source output power is 6.4 mW, and the wavelength scan rate is 80 nm / s. The wavelength scan time is 1.375S, such as Santec's TSL-550 laser;

[0072] 2) The photosensitive material of the first detector 212, the second detector 306a, and the third detector 306b are ingaas, the common mode suppression ratio is 25 dB, the light detection range is 900 to 1700 nm, the maximum detection bandwidth is 80 MHz, saturation differential detection Power is 55UW, cross-resist anti-gain 5000V / A, minimum noise equi...

Technical field

[0001] Design of the present invention belongs to the field of optical measurement techniques, particularly to optical frequency domain interferometry based on the Fiber Distributed fast polarization crosstalk measuring means. Background technique

[0002] Polarization maintaining fiber, also known as high-birefringence fiber, the fiber linear birefringence increased by adding artificial stress manner, in order to remove the effects of random polarization introduced by the optical fiber perturbation brought about by the external environment, and thus has to maintain and control the polarization effect . Attach figure 2 He described the panda-type polarization maintaining fiber cross-sectional schematic view, comprises two orthogonal axes of different refractive index characteristics, two stress rods and a core, wherein the core deliberately enlarged to clearly among the light beam. Panda type PM fiber is embedded during manufacture two stress rods on both sides of...

Examples

specific Embodiment approach 1

[0050] 1 1, a distributed polarizing string rapid measurement device of Y waveguide, such as attached Figure 4 Indicated.

[0051] Composed of the tunable laser source module 1, the device module 2, the auxiliary interferometer module 3, and the signal acquisition analysis module 4, wherein:

[0052] 1) The tunable laser source module 1 outputs a linear frequency modulation continuous light 501, and injects the first coupled device 502 from the first couplen input terminal 502 to two beam light;

[0053] 2) The light beam output by the first coupler first output terminal 502c is injected into the device module 2 in which the polarizer 202 is passed, the polarizer output terminal tail 203, the first connection point 204, the device input end tail The fiber 206, the second connection point 205, the Y waveguide pending device 206Y, the third connection point 207, the device output terminus 106b, the fourth connection point 208, the detector input end tail 509, the detector 210 Afterw...

specific Embodiment approach 2

[0069] DETAILED DESCRIPTION 2, a distributed polarizing strut rapid measurement device of a fiber optic ring, such as attached Figure 5 Indicated.

[0070] The selection of the primary photoelectric device of the invention and its performance parameters are as follows:

[0071] 1) The tunable laser source module 1 is a narrow line wide tunable laser capable of continuous wavelength scanning, the wavelength tuning range is 1510 nm to 1620 nm, turning on high coherent mode, the light source output power is 6.4 mW, and the wavelength scan rate is 80 nm / s. The wavelength scan time is 1.375S, such as Santec's TSL-550 laser;

[0072] 2) The photosensitive material of the first detector 212, the second detector 306a, and the third detector 306b are ingaas, the common mode suppression ratio is 25 dB, the light detection range is 900 to 1700 nm, the maximum detection bandwidth is 80 MHz, saturation differential detection Power is 55UW, cross-resist anti-gain 5000V / A, minimum noise equi...

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