CN104132798A - Y-waveguide integrated optics phase modulator modulation factor measurement device and method - Google Patents
Y-waveguide integrated optics phase modulator modulation factor measurement device and method Download PDFInfo
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- CN104132798A CN104132798A CN201410359541.3A CN201410359541A CN104132798A CN 104132798 A CN104132798 A CN 104132798A CN 201410359541 A CN201410359541 A CN 201410359541A CN 104132798 A CN104132798 A CN 104132798A
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Abstract
The invention provides a Y-waveguide integrated optics phase modulator modulation factor measurement device and method. The device comprises a wide-spectrum light source, a circulator, a Y-waveguide integrated optics phase modulator, a polarization beam splitter, polarization-maintaining delay optical fibers, a Faraday optical rotation reflector, a signal generator, a photoelectric detector and an oscilloscope. The Y-waveguide integrated optics phase modulator modulation factor measurement device and method are of great significance in grasping the optical fiber current transformer transformation ratio temperature error production mechanism and inhibition method and improving temperature environmental suitability and long-term running stability of an optical fiber current transformer.
Description
Technical field
The present invention relates to a kind of apparatus and method, be specifically related to a kind of Y waveguide integrated optic phase modulator index of modulation measurement mechanism and method.
Background technology
Y waveguide integrated optic phase modulator adopts lithium niobate (LiNbO
3) as base material, form waveguide by proton exchange technique, integrated inclined to one side, light splitting and the large function of phase-modulation three, reduced the quantity of device, strengthened the reliability of device, it is the core devices that digital closed loop optical fiber current mutual inductor is realized high precision, great dynamic range measurement.
Digital closed loop optical fiber current mutual inductor based on Faraday effect utilizes Y waveguide integrated optic phase modulator to realize bias modulation and FEEDBACK CONTROL, in conjunction with digital phase lock amplifying technology, realize the measurement of primary current by the phase differential between the orthogonal circular polarizations light that in detection sensor fibre, two bundle rotation directions are contrary, have that accuracy of measurement is high, Hz-KHz is wide, dynamic range is large, insulation is simple, without the advantage such as ferroresonance, Digital output, volume be little, lightweight, have important application in intelligent substation, extra-high voltage AC and DC field of power transmission.
The temperature stability of accuracy of measurement is one of important indicator of evaluating optical fiber current mutual inductor performance, is also the principal element of current limit fibre current transformer large-scale application.Y waveguide integrated optic phase modulator is positioned at the feedback channel of optical fiber current mutual inductor digital closed loop signal detection system, and its index of modulation unit of being defined as modulation voltage is additional phase modulation on transmission light wave, and it is the important component part of feedback gain.When variation of ambient temperature, the index of modulation will change, and the no-load voltage ratio of mutual inductor also will change thereupon, cause ratio error, affect the accuracy of measurement of mutual inductor.
Summary of the invention
The invention provides a kind of Y waveguide integrated optic phase modulator index of modulation measurement mechanism and method, for mechanism of production and the inhibition method of grasping optical fiber current mutual inductor no-load voltage ratio temperature error, the temperature environment adaptability and the long-time running stability that promote optical fiber current mutual inductor are significant.
In order to realize foregoing invention object, the present invention takes following technical scheme:
The invention provides a kind of Y waveguide integrated optic phase modulator index of modulation measurement mechanism, described device comprises wide spectrum light source, circulator, Y waveguide integrated optic phase modulator, polarization beam apparatus, guarantor's off-delay optical fiber, Faraday catoptron, signal generator, photodetector and oscillograph; The light wave that described wide spectrum light source sends is through circulator, risen partially by Y waveguide integrated optic phase modulator, light splitting is two bunch polarized lights, and two bunch polarized lights are edge guarantor off-delay Optical Fiber Transmission after polarization beam apparatus closes light respectively, returns through Faraday catoptron reflection Hou Yanyuan road; The two bunch polarized lights that Yan Yuan returns on road interfere after the analyzing of Y waveguide integrated optic phase modulator, produce interference light intensity; Described signal generator produces saw wave modulator signal and is transferred to described Y waveguide integrated optic phase modulator, and described photodetector changes interference light intensity into voltage signal, by the corresponding waveform of oscilloscope display.
Described wide spectrum light source is the light source module that carries driving circuit, adopts super-radiance light emitting diode or erbium-doped fiber optic source.
Described circulator is single-mode fiber circulator or polarization maintaining fiber ring device.
Described polarization beam apparatus is polarization maintaining optical fibre polarization beam apparatus, and its input optical fibre and output tail optical fiber are panda type polarization-preserving fiber;
Described guarantor's off-delay optical fiber adopts panda type polarization-preserving fiber, and length is greater than 50m.
The optically-active angle of described Faraday catoptron is 45 °, error is less than ± and 1 °, reflectivity is greater than 90%; Described photodetector adopts the detector integrated package of belt current-voltage conversion circuit.
Playing inclined to one side linearly polarized light light splitting through Y waveguide integrated optic phase modulator is First Line polarized light and the second linearly polarized light, and described First Line polarized light is identical with the polarization direction of the second linearly polarized light.
Described First Line polarized light and the second linearly polarized light transmit along fast axle and the slow axis of protecting off-delay optical fiber after polarization beam apparatus closes light, return through Faraday catoptron reflection Hou Yanyuan road, there is exchange in polarization mode, along the First Line polarized light of protecting the fast axle transmission of off-delay optical fiber now along slow axis transmission, along the second linearly polarized light of protecting the transmission of off-delay optical fiber slow axis now along fast axle transmission; First Line polarized light and the second linearly polarized light again enter the analyzing of Y waveguide integrated optic phase modulator and interfere through polarization beam apparatus light splitting.
The present invention also provides a kind of method that adopts Y waveguide integrated optic phase modulator index of modulation measurement mechanism to measure the Y waveguide integrated optic phase modulator index of modulation, said method comprising the steps of:
Step 1: the modulation voltage that calculates Y waveguide integrated optic phase modulator;
Step 2: calculate the phase differential between two bunch polarized lights;
Step 3: the output voltage that calculates photodetector;
Step 4: determine the Y waveguide integrated optic phase modulator birefringence index of modulation.
In described step 1, the modulation voltage V of Y waveguide integrated optic phase modulator
m(t) represent, have:
Wherein, V
rwith T be sawtooth wave voltage amplitude and cycle, k=0,1,2 ...
In described step 2, the phase differential between First Line polarized light and the second linearly polarized light is used
represent, have:
Wherein, K is the birefringence index of modulation of Y waveguide integrated optic phase modulator, and τ is that light wave comes and goes the mistiming through Y waveguide integrated optic phase modulator, V twice
mand V (t)
m(t-τ) is respectively t and the modulation voltage in t-τ moment,
for V
rthe birefringence phase modulation producing, and
In described step 3, the output voltage V of photodetector
prepresent, have:
Wherein, η is the product of photodetector responsiveness and transimpedance, and α is optical path loss, I
xfor the light intensity of X polarized component in light source output light-wave.
Described step 4 comprises the following steps:
Step 4-1: while calculating the amplitude e=0 of square-wave signal of photodetector output, meet formula (4)
minimum positive number solution, has:
Meet the minimum positive number solution of formula (4)
corresponding V
r=V
2 π, V
2 πfor the all-wave voltage of Y waveguide integrated optic phase modulator;
Step 4-2: calculate the birefringence index of modulation K of Y waveguide integrated optic phase modulator, have:
Compared with prior art, beneficial effect of the present invention is:
Two orthogonal polarization modes transmission of 1.Y wave-guide integrated optics phase-modulator and guarantor's off-delay optical fiber, the complete reciprocity of light channel structure, environmental interference has very strong immunocompetence to external world;
2. use general signal generator and oscillograph can complete test, simple, convenient, efficient;
3. for mechanism of production and the inhibition method of grasping optical fiber current mutual inductor no-load voltage ratio temperature error, the temperature environment adaptability and the long-time running stability that promote optical fiber current mutual inductor are significant.
Brief description of the drawings
Fig. 1 is Y waveguide integrated optic phase modulator birefringence index of modulation measurement mechanism structure principle chart in the embodiment of the present invention;
Fig. 2 is Y waveguide integrated optic phase modulator birefringence index of modulation measuring principle schematic diagram (V in the embodiment of the present invention
r≠ V
2 π);
Fig. 3 is Y waveguide integrated optic phase modulator birefringence index of modulation measuring principle schematic diagram (V in the embodiment of the present invention
r=V
2 π).
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further detail.
As Fig. 1, the invention provides a kind of Y waveguide integrated optic phase modulator index of modulation measurement mechanism, described device comprises wide spectrum light source, circulator, Y waveguide integrated optic phase modulator, polarization beam apparatus, guarantor's off-delay optical fiber, Faraday catoptron, signal generator, photodetector and oscillograph; The light wave that described wide spectrum light source sends is through circulator, risen partially by Y waveguide integrated optic phase modulator, light splitting is two bunch polarized lights, and two bunch polarized lights are edge guarantor off-delay Optical Fiber Transmission after polarization beam apparatus closes light respectively, returns through Faraday catoptron reflection Hou Yanyuan road; The two bunch polarized lights that Yan Yuan returns on road interfere after the analyzing of Y waveguide integrated optic phase modulator, produce interference light intensity; Described signal generator produces saw wave modulator signal and is applied on described Y waveguide integrated optic phase modulator, and described photodetector changes interference light intensity into voltage signal, by the corresponding waveform of oscilloscope display.
Described wide spectrum light source is the light source module that carries driving circuit, adopts super-radiance light emitting diode or erbium-doped fiber optic source.
Described circulator is single-mode fiber circulator or polarization maintaining fiber ring device.
Described polarization beam apparatus is polarization maintaining optical fibre polarization beam apparatus, and its input optical fibre and output tail optical fiber are panda type polarization-preserving fiber;
Described guarantor's off-delay optical fiber adopts panda type polarization-preserving fiber, and length is greater than 50m.
The optically-active angle of described Faraday catoptron is 45 °, error is less than ± and 1 °, reflectivity is greater than 90%; Described photodetector adopts the detector integrated package of belt current-voltage conversion circuit.
Playing inclined to one side linearly polarized light light splitting through Y waveguide integrated optic phase modulator is First Line polarized light and the second linearly polarized light, and described First Line polarized light is identical with the polarization direction of the second linearly polarized light.
Described First Line polarized light and the second linearly polarized light transmit along fast axle and the slow axis of protecting off-delay optical fiber after polarization beam apparatus closes light, return through Faraday catoptron reflection Hou Yanyuan road, there is exchange in polarization mode, along the First Line polarized light of protecting the fast axle transmission of off-delay optical fiber now along slow axis transmission, along the second linearly polarized light of protecting the transmission of off-delay optical fiber slow axis now along fast axle transmission; First Line polarized light and the second linearly polarized light again enter the analyzing of Y waveguide integrated optic phase modulator and interfere through polarization beam apparatus light splitting.
The present invention also provides a kind of method that adopts Y waveguide integrated optic phase modulator index of modulation measurement mechanism to measure the Y waveguide integrated optic phase modulator index of modulation, said method comprising the steps of:
Step 1: the modulation voltage that calculates Y waveguide integrated optic phase modulator;
Step 2: calculate the phase differential between two bunch polarized lights;
Step 3: the output voltage that calculates photodetector;
Step 4: determine the Y waveguide integrated optic phase modulator birefringence index of modulation.
In described step 1, the modulation voltage V of Y waveguide integrated optic phase modulator
m(t) represent, have:
Wherein, V
rwith T be sawtooth wave voltage amplitude and cycle, k=0,1,2 ..., its waveform is as shown in signal 1 in accompanying drawing 2.
In described step 2, the phase differential between First Line polarized light and the second linearly polarized light is used
represent, have:
Wherein, K is the birefringence index of modulation of Y waveguide integrated optic phase modulator, and τ is that light wave comes and goes the mistiming through Y waveguide integrated optic phase modulator, V twice
mand V (t)
m(t-τ) is respectively t and the modulation voltage in t-τ moment,
for V
rthe birefringence phase modulation producing, and
waveform is as shown in signal 2 in accompanying drawing 2.
In described step 3, the output voltage V of photodetector
prepresent, have:
Wherein, η is the product of photodetector responsiveness and transimpedance, and α is optical path loss, I
xfor the light intensity of X polarized component in light source output light-wave; The output voltage V of photodetector
pwaveform is as shown in square-wave signal 3 in accompanying drawing 2.
Described step 4 comprises the following steps:
Step 4-1: while calculating the amplitude e=0 of square-wave signal of photodetector output, meet formula (4)
minimum positive number solution, has:
Meet the minimum positive number solution of formula (4)
corresponding V
r=V
2 π, V
2 πfor the all-wave voltage of Y waveguide integrated optic phase modulator; Corresponding waveform as shown in Figure 3.
Step 4-2: calculate the birefringence index of modulation K of Y waveguide integrated optic phase modulator, have:
Embodiment
Wide spectrum light source is the light source module that carries driving circuit, can be super-radiance light emitting diode, can be also erbium-doped fiber optic source; Circulator is single-mode fiber circulator, or polarization maintaining fiber ring device; The automatic welding of output tail optical fiber of the input tail optical fiber of tested Y waveguide integrated optic phase modulator and single-mode fiber circulator, or with 0 ° of the output tail optical fiber of polarization maintaining fiber ring device to axle welding, the output tail optical fiber of modulator respectively with 0 ° of the input tail optical fiber of polarization beam apparatus to axle welding; Polarization beam apparatus is polarization maintaining optical fibre polarization beam apparatus, and its input, output tail optical fiber are panda type polarization-preserving fiber; Protect off-delay optical fiber and adopt panda type polarization-preserving fiber, its length is about 100m, determines thus transit time τ=1 μ s; The optically-active angle of Faraday catoptron is 45 °, error is less than ± and 1 °, reflectivity is greater than 90%; Photodetector adopts the detector integrated package of belt current-voltage conversion circuit; Signal generator and oscillograph are general instrument and equipment.
The measuring process of the Y waveguide integrated optic phase modulator index of modulation is:
(1) be applied on Y waveguide integrated optic phase modulator by the saw wave modulator signal 1 of signal generator generation cycle T=10 μ s, meanwhile, observe the output of photodetector with oscillograph;
(2) regulate the amplitude of sawtooth signal 1, reduce gradually until while becoming signal 6, record the now amplitude V of sawtooth signal 4 as the amplitude e of the output signal 3 of photodetector
2 π;
(3) according to the index of modulation of formula (5) calculating modulator.
Finally should be noted that: above embodiment is only in order to illustrate that technical scheme of the present invention is not intended to limit; those of ordinary skill in the field still can modify or be equal to replacement the specific embodiment of the present invention with reference to above-described embodiment; these do not depart from any amendment of spirit and scope of the invention or are equal to replacement, within the claim protection domain of the present invention all awaiting the reply in application.
Claims (12)
1. a Y waveguide integrated optic phase modulator index of modulation measurement mechanism, is characterized in that: described device comprises wide spectrum light source, circulator, Y waveguide integrated optic phase modulator, polarization beam apparatus, guarantor's off-delay optical fiber, Faraday catoptron, signal generator, photodetector and oscillograph; The light wave that described wide spectrum light source sends is through circulator, risen partially by Y waveguide integrated optic phase modulator, light splitting is two bunch polarized lights, and two bunch polarized lights are edge guarantor off-delay Optical Fiber Transmission after polarization beam apparatus closes light respectively, returns through Faraday catoptron reflection Hou Yanyuan road; The two bunch polarized lights that Yan Yuan returns on road interfere after the analyzing of Y waveguide integrated optic phase modulator, produce interference light intensity; Described signal generator produces saw wave modulator signal and is applied on described Y waveguide integrated optic phase modulator, and described photodetector changes interference light intensity into voltage signal, by the corresponding waveform of oscilloscope display.
2. Y waveguide integrated optic phase modulator index of modulation measurement mechanism according to claim 1, is characterized in that: described wide spectrum light source is the light source module that carries driving circuit, adopts super-radiance light emitting diode or erbium-doped fiber optic source.
3. Y waveguide integrated optic phase modulator index of modulation measurement mechanism according to claim 1, is characterized in that: described circulator is single-mode fiber circulator or polarization maintaining fiber ring device.
4. Y waveguide integrated optic phase modulator index of modulation measurement mechanism according to claim 1, is characterized in that: described polarization beam apparatus is polarization maintaining optical fibre polarization beam apparatus, and its input optical fibre and output tail optical fiber are panda type polarization-preserving fiber;
Described guarantor's off-delay optical fiber adopts panda type polarization-preserving fiber, and length is greater than 50m.
5. Y waveguide integrated optic phase modulator index of modulation measurement mechanism according to claim 1, is characterized in that: the optically-active angle of described Faraday catoptron is 45 °, error is less than ± and 1 °, reflectivity is greater than 90%; Described photodetector adopts the detector integrated package of belt current-voltage conversion circuit.
6. Y waveguide integrated optic phase modulator index of modulation measurement mechanism according to claim 1, it is characterized in that: playing inclined to one side linearly polarized light light splitting through Y waveguide integrated optic phase modulator is First Line polarized light and the second linearly polarized light, and described First Line polarized light is identical with the polarization direction of the second linearly polarized light.
7. Y waveguide integrated optic phase modulator index of modulation measurement mechanism according to claim 6, it is characterized in that: described First Line polarized light and the second linearly polarized light transmit along fast axle and the slow axis of protecting off-delay optical fiber after polarization beam apparatus closes light, return through Faraday catoptron reflection Hou Yanyuan road, there is exchange in polarization mode, along the First Line polarized light of protecting the fast axle transmission of off-delay optical fiber now along slow axis transmission, along the second linearly polarized light of protecting the transmission of off-delay optical fiber slow axis now along fast axle transmission; First Line polarized light and the second linearly polarized light again enter the analyzing of Y waveguide integrated optic phase modulator and interfere through polarization beam apparatus light splitting.
8. a method that adopts the arbitrary described Y waveguide integrated optic phase modulator index of modulation measurement mechanism of claim 1-7 to measure the Y waveguide integrated optic phase modulator index of modulation, is characterized in that: said method comprising the steps of:
Step 1: the modulation voltage that calculates Y waveguide integrated optic phase modulator;
Step 2: calculate the phase differential between two bunch polarized lights;
Step 3: the output voltage that calculates photodetector;
Step 4: determine the Y waveguide integrated optic phase modulator birefringence index of modulation.
9. the method that the Y waveguide integrated optic phase modulator index of modulation is measured according to claim 8, is characterized in that: in described step 1, and the modulation voltage V of Y waveguide integrated optic phase modulator
m(t) represent, have:
Wherein, V
rwith T be sawtooth wave voltage amplitude and cycle, k=0,1,2 ...
10. the method that the Y waveguide integrated optic phase modulator index of modulation is measured according to claim 8, is characterized in that: in described step 2, the phase differential between First Line polarized light and the second linearly polarized light is used
represent, have:
Wherein, K is the birefringence index of modulation of Y waveguide integrated optic phase modulator, and τ is that light wave comes and goes the mistiming through Y waveguide integrated optic phase modulator, V twice
mand V (t)
m(t-τ) is respectively t and the modulation voltage in t-τ moment,
for V
rthe birefringence phase modulation producing, and
11. methods that the Y waveguide integrated optic phase modulator index of modulation is measured according to claim 8, is characterized in that: in described step 3, and the output voltage V of photodetector
prepresent, have:
Wherein, η is the product of photodetector responsiveness and transimpedance, and α is optical path loss, I
xfor the light intensity of X polarized component in light source output light-wave.
12. methods that the Y waveguide integrated optic phase modulator index of modulation is measured according to claim 8, is characterized in that: described step 4 comprises the following steps:
Step 4-1: while calculating the amplitude e=0 of square-wave signal of photodetector output, meet formula (4)
minimum positive number solution, has:
Meet the minimum positive number solution of formula (4)
corresponding V
r=V
2 π, V
2 πfor the all-wave voltage of Y waveguide integrated optic phase modulator;
Step 4-2: calculate the birefringence index of modulation K of Y waveguide integrated optic phase modulator, have:
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| CN109991735A (en) * | 2018-01-02 | 2019-07-09 | 全球能源互联网研究院有限公司 | A kind of combined optical element and optical fiber current sensing device |
| CN109752581A (en) * | 2019-03-14 | 2019-05-14 | 北京交通大学 | Polarize analyzing formula closed loop all-fiber current transformator |
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| CN111337759A (en) * | 2020-03-04 | 2020-06-26 | 中国地质大学（武汉） | Closed-loop electric field detection system integrated with BGO crystal optical waveguide |
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| CN111337052B (en) * | 2020-03-20 | 2024-03-22 | 北京世维通光智能科技有限公司 | Y waveguide parameter measuring instrument, measuring system and measuring method |
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