CN111781752A - Double-crystal phase modulation device and method for optical fiber ring interferometer - Google Patents
Double-crystal phase modulation device and method for optical fiber ring interferometer Download PDFInfo
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- CN111781752A CN111781752A CN202010425686.4A CN202010425686A CN111781752A CN 111781752 A CN111781752 A CN 111781752A CN 202010425686 A CN202010425686 A CN 202010425686A CN 111781752 A CN111781752 A CN 111781752A
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- 239000013078 crystal Substances 0.000 title claims abstract description 103
- 239000013307 optical fiber Substances 0.000 title claims abstract description 70
- 238000000034 method Methods 0.000 title claims abstract description 11
- 230000003287 optical effect Effects 0.000 claims abstract description 78
- 230000010287 polarization Effects 0.000 claims description 32
- 230000006698 induction Effects 0.000 claims description 16
- 239000000835 fiber Substances 0.000 claims description 12
- 230000008859 change Effects 0.000 claims description 11
- 230000000694 effects Effects 0.000 claims description 5
- GQYHUHYESMUTHG-UHFFFAOYSA-N lithium niobate Chemical group [Li+].[O-][Nb](=O)=O GQYHUHYESMUTHG-UHFFFAOYSA-N 0.000 claims description 4
- 230000005540 biological transmission Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/03—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on ceramics or electro-optical crystals, e.g. exhibiting Pockels effect or Kerr effect
- G02F1/0305—Constructional arrangements
- G02F1/0311—Structural association of optical elements, e.g. lenses, polarizers, phase plates, with the crystal
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/09—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on magneto-optical elements, e.g. exhibiting Faraday effect
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Abstract
The invention discloses a double-crystal phase modulation device and a method for an optical fiber ring interferometer, wherein an electro-optical crystal device A and an electro-optical crystal device B are mutually arranged at 90 degrees, a Faraday optical rotator A is arranged on the outer side of the electro-optical crystal device A, a polarizing plate A is arranged on the outer side of the Faraday optical rotator A, and an optical fiber collimator A is arranged on the outer side of the polarizing plate A; a Faraday optical rotator B is arranged on the outer side of the electro-optical crystal device B, a polarizing plate B is arranged on the outer side of the Faraday optical rotator B, and an optical fiber collimator B is arranged on the outer side of the polarizing plate B; the optical fiber collimator A, the polaroid A, the Faraday optical rotator A, the electro-optical crystal device B, the Faraday optical rotator B, the polaroid B and the optical fiber collimator B are arranged in a straight line; and the optical fiber collimator A or B is used for connecting the optical fiber loop light path of the optical fiber loop interferometer into the Faraday rotator A or B. The invention utilizes the transverse application of the optical axis light transmission of the electro-optic crystal, eliminates the influence of natural birefringence and overcomes the disadvantage that the natural birefringence is influenced by temperature.
Description
Technical Field
The invention relates to the field of optical phase shifting, in particular to a double-crystal phase modulation device and method for an optical fiber ring interferometer.
Background
Fiber ring interferometers (or fiber Sagnac interferometers) have been successfully used in fiber optic gyroscopes due to their high sensitivity, where signal detection is based on phase modulation and demodulation techniques. At present, a phase modulation mode based on transit time is mainly applied to the optical fiber gyroscope, is limited by the influence of local oscillator frequency, needs an additional technical means to ensure time delay, and has influence on the cost and the reliability of the optical fiber gyroscope.
Disclosure of Invention
The invention aims to provide a double-crystal phase modulation device and a double-crystal phase modulation method for an optical fiber ring interferometer, which avoid the defects and technical difficulties caused by the local oscillation frequency of the existing phase modulator and provide an optical path reference with low cost and high reliability for the optical fiber ring interferometer.
In order to realize the purpose, the following technical scheme is adopted: the invention provides a double-crystal phase modulation device for an optical fiber ring interferometer, which comprises an optical fiber ring light path of the optical fiber ring interferometer, an optical fiber collimator A, a polarizing plate A, a Faraday optical rotator A, an electro-optical crystal device B, a Faraday optical rotator B, a polarizing plate B and an optical fiber collimator B;
the electro-optical crystal device A and the electro-optical crystal device B are mutually arranged at 90 degrees, a Faraday optical rotator A is arranged on the outer side of the electro-optical crystal device A, a polarizing plate A is arranged on the outer side of the Faraday optical rotator A, and an optical fiber collimator A is arranged on the outer side of the polarizing plate A; a Faraday optical rotator B is arranged on the outer side of the electro-optical crystal device B, a polarizing plate B is arranged on the outer side of the Faraday optical rotator B, and an optical fiber collimator B is arranged on the outer side of the polarizing plate B; the optical fiber collimator A, the polaroid A, the Faraday optical rotator A, the electro-optical crystal device B, the Faraday optical rotator B, the polaroid B and the optical fiber collimator B are linearly arranged; and the optical fiber collimator A or B is used for connecting the optical fiber loop light path of the optical fiber loop interferometer into the Faraday rotator A or B.
Further, the electro-optical crystal in the electro-optical crystal device A, B is a lithium niobate crystal.
Further, the two faraday rotators A, B with opposite rotation directions have an optical rotation angle of 450Respectively, outside the electro-optic crystal device A, B.
Further, a modulation voltage is applied to the electro-optic crystal device A, B to generate an electro-birefringence effect.
Further, the rotation directions of the faraday rotator A, B are opposite, and two electro-optical crystal devices A, B which are at 90 ° with each other are located in the middle of the two faraday rotators.
Further, the plane of the major axis of electric induction in the electro-optic crystal device A, B is perpendicular to the direction of incident light.
The invention also provides a double-crystal phase modulation method for the optical fiber ring interferometer, which comprises the following steps:
s1, connecting the Faraday rotator to the ring interferometer by using the optical fiber collimator, and introducing the Faraday rotator into the optical path;
s2, controlling the polarization direction of the light at the entrance of the Faraday rotator by using a polarizer;
s3, respectively rotating two paths of linearly polarized light with the same polarization direction incident from the optical path of the fiber ring interferometer by utilizing two Faraday optical rotation devices with opposite rotation directions and 45-degree optical rotation angles;
s4, controlling the optical rotation angle of the two Faraday rotator and the polarization direction of the polarized light incident from the outside to make the polarization direction of the emergent light rotate to the two electric induction main axis directions generated by the double refraction of the electro-optical crystal;
and S5, modulating the electro-optic phase delay of the electro-optic crystal by the change of the applied modulating voltage, and modulating the phase difference of linearly polarized light passing through the phase modulator from different ports.
The working process is roughly as follows:
to provide an electro-optical crystal device using two electro-optical crystal devices arranged at 90 DEG to each other to cancel out a phase difference caused by natural birefringence and temperature variation; applying a modulation voltage on an electrode of the electro-optical crystal device to enable the electro-optical crystal to generate induced birefringence; the plane where the electro-optic crystal electric induction main shaft is located is vertical to the propagation direction of incident light; two Faraday optical rotation devices with opposite rotation directions and the same optical rotation angle are used for respectively rotating two paths of linearly polarized light with the same polarization direction, which are incident from the optical path of the optical fiber ring interferometer; controlling the optical rotation angle of the Faraday rotator and the polarization direction of the polarized light incident on the Faraday rotator to ensure that the polarization directions of emergent light of the Faraday rotator are respectively rotated to the directions of two electric induction main shafts generated by the electro-optical crystal due to electric birefringence; the electro-optic phase delay of the electro-optic crystal is modulated through the change of the applied modulation voltage, so that the phase difference of linearly polarized light passing through the phase modulator from different ports is modulated.
Compared with the prior art, the invention has the following advantages: by utilizing the transverse application of the optical axis light transmission of the electro-optic crystal, the serious influence of natural birefringence is eliminated, the disadvantage that the natural birefringence is greatly influenced by temperature is overcome, and particularly, the half-wave voltage can be effectively reduced compared with the phase modulation applied transversely to a single crystal.
Drawings
Fig. 1 is a schematic diagram of the application of the present invention.
Fig. 2 is a block diagram of the present invention.
Reference numerals: 1-optical fiber ring light path of optical fiber ring interferometer, 2-optical fiber collimator A, 3-polaroid A, 4-Faraday optical rotator A, 5-electrooptical crystal device A, 6-electrooptical crystal device B, 7-Faraday optical rotator B, 8-polaroid B and 9-optical fiber collimator B.
Detailed Description
The invention is further described below with reference to the accompanying drawings:
as shown in fig. 1 and 2, the device of the present invention includes a fiber ring light path 1 of a fiber ring interferometer, a fiber collimator a2, a polarizer A3, a faraday rotator a4, an electro-optic crystal device a5, an electro-optic crystal device B6, a faraday rotator B7, a polarizer B8 and a fiber collimator B9;
the electro-optical crystal device A and the electro-optical crystal device B are mutually arranged at 90 degrees, a Faraday optical rotator A is arranged on the outer side of the electro-optical crystal device A, a polarizing plate A is arranged on the outer side of the Faraday optical rotator A, and an optical fiber collimator A is arranged on the outer side of the polarizing plate A; a Faraday optical rotator B is arranged on the outer side of the electro-optical crystal device B, a polarizing plate B is arranged on the outer side of the Faraday optical rotator B, and an optical fiber collimator B is arranged on the outer side of the polarizing plate B; the optical fiber collimator A, the polaroid A, the Faraday optical rotator A, the electro-optical crystal device B, the Faraday optical rotator B, the polaroid B and the optical fiber collimator B are linearly arranged; and the optical fiber collimator A or B is used for connecting the optical fiber loop light path of the optical fiber loop interferometer into the Faraday rotator A or B.
Wherein, the electro-optical crystal in the electro-optical crystal device A, B is a lithium niobate crystal.
The two faraday optical rotation devices A, B with opposite rotation directions have 45 ° rotation angles, and are respectively arranged outside the electro-optical crystal device A, B.
A modulating voltage is applied across the electro-optic crystal device A, B to cause it to produce an electro-birefringence effect.
The faraday rotator A, B has opposite handedness, and two electro-optical crystal devices A, B at 90 ° to each other are located in the middle of the two faraday rotators.
The plane in which the principal axes of electrical induction in the electro-optic crystal device A, B lie is perpendicular to the direction of incident light.
The specific implementation is as follows:
firstly, two Faraday optical rotation devices with opposite rotation directions and equal optical rotation angles are used for respectively rotating two paths of linearly polarized light incident from an optical path of the optical fiber ring interferometer.
The polarization directions of the two linearly polarized light beams incident on the optical path of the fiber ring interferometer are the same, and in order to ensure that the polarization directions of the two linearly polarized light beams incident on the phase modulator according to the present invention are the same as the polarization directions of the two linearly polarized light beams leaving the phase modulator, the two faraday optical rotation devices are required to have opposite rotation directions and equal optical rotation angles.
Secondly, placing a pair of electro-optical crystal devices which are arranged at 90 degrees to each other in the two Faraday optical rotation devices; counteracting the phase difference caused by natural birefringence and temperature change; applying a modulation voltage on an electrode of the electro-optic crystal device to enable the electro-optic crystal to generate electro-birefringence; the plane where the electro-optic crystal induction main shaft is located is vertical to the direction of incident light; controlling the optical rotation angles of the two Faraday rotation devices and the polarization directions of polarized light incident on the Faraday rotation devices to ensure that the polarization directions of emergent light of the Faraday rotation devices are respectively rotated to the directions of two induction main shafts generated by the electric birefringence of the electro-optic crystal; the electro-optic phase delay of the electro-optic crystal is modulated by the change of the over-applied modulation voltage, so that the phase difference of linearly polarized light passing through the phase modulator from different ports is modulated.
The optical path of the optical fiber ring interferometer to be accessed by the phase modulator consists of the polarization-maintaining optical fiber, and the phase modulator does not need to use a mode of adding a polarizing film, and the polarization direction of the polarization-maintaining optical fiber is directly adjusted to be aligned with the interface of the phase modulator.
Two lithium niobate crystals which are completely the same are manufactured by two, and the spaces are arranged at 90 degrees. The o light in the first crystal enters the second crystal to be changed into the e light, the e light in the first crystal enters the second crystal to be changed into the o light, as long as the lengths and the widths of the two crystals are completely the same, phase differences caused by natural birefringence and temperature change can be mutually counteracted, and only the phase difference caused by an electro-optic effect exists between two light beams emitted by the second crystal.
The invention discloses a double-crystal phase modulation method for an optical fiber ring interferometer, which comprises the following steps:
s1, connecting the Faraday rotator to the ring interferometer by using the optical fiber collimator, and introducing the Faraday rotator into the optical path;
s2, controlling the polarization direction of the light at the entrance of the Faraday rotator by using a polarizer;
s3, respectively rotating two paths of linearly polarized light with the same polarization direction incident from the optical path of the fiber ring interferometer by utilizing two Faraday optical rotation devices with opposite rotation directions and 45-degree optical rotation angles;
s4, controlling the optical rotation angle of the two Faraday rotator and the polarization direction of the polarized light incident from the outside to make the polarization direction of the emergent light rotate to the two electric induction main axis directions generated by the double refraction of the electro-optical crystal;
and S5, modulating the electro-optic phase delay of the electro-optic crystal by the change of the applied modulating voltage, and modulating the phase difference of linearly polarized light passing through the phase modulator from different ports.
A pair of electro-optical crystal devices arranged at 90 degrees to each other are placed in the two Faraday rotator devices for offsetting the phase difference caused by natural birefringence and temperature change; two Faraday optical rotation devices with opposite rotation directions and the same optical rotation angle are used for respectively rotating two paths of linearly polarized light with the same polarization direction, which are incident from an optical path of the optical fiber ring interferometer; applying a modulation voltage on an electrode of the electro-optic crystal device to enable the electro-optic crystal to generate electro-birefringence; the plane of an electric induction main shaft of the electro-optical crystal device is vertical to the direction of incident light; controlling the optical rotation angles of the two Faraday rotator and the polarization directions of polarized light incident from the outside to make the polarization directions of emergent light respectively rotate to the directions of two electric induction main axes generated by electric birefringence of the electro-optical crystal; the electro-optic phase delay of the electro-optic crystal is modulated through the change of the applied modulation voltage, so that the phase difference of linearly polarized light passing through the phase modulator from different ports is modulated.
The pair of electro-optic crystal devices which are mutually arranged into 900 are used for offsetting phase difference caused by natural birefringence and temperature change and generating an electro-birefringence effect under the external modulation voltage; the plane of the electric induction main axis of the electro-optical crystal device is vertical to the direction of incident light.
Two Faraday optical rotation devices with opposite rotation directions and the same optical rotation angle are used for respectively rotating two paths of linearly polarized light with the same polarization direction, which are incident from an optical path of the optical fiber ring interferometer; controlling the optical rotation angles of the two Faraday rotator and the polarization directions of polarized light incident from the outside to make the polarization directions of emergent light respectively rotate to the directions of two electric induction main axes generated by electric birefringence of the electro-optical crystal;
the polarization direction of light at the entrance of the faraday rotator is controlled by the polarizer.
And the optical fiber collimator is used for realizing the access of the polarizer to the annular interferometer.
The electro-optic phase delay of the electro-optic crystal is modulated through the change of the applied modulation voltage, so that the phase difference of linearly polarized light passing through the phase modulator from different ports is modulated.
The working process of the invention is roughly as follows:
one path of light in the optical path of the optical fiber ring interferometer is guided in by an optical fiber collimator A, and is incident to a Faraday optical rotator A behind the optical fiber ring interferometer in a polarization direction with an included angle of 45 degrees with an electric induction main shaft of the electro-optic crystal after passing through a polaroid A; the Faraday rotator A rotates the polarization direction of the incident polarized light to the left at an optical rotation angle of 45 degrees and then the polarized light is incident to a rear electro-optical crystal device B; the plane of the electric induction main shaft of the electro-optical crystal device B is vertical to the direction of incident light; the light emitted from the electro-optical crystal device B enters a Faraday optical rotation device B which is connected with the electro-optical crystal device B, and the Faraday optical rotation device B rotates the polarization direction of incident light in a right way at an optical rotation angle of 45 degrees; the light emitted from the Faraday device B enters a polaroid B, and the polarization direction of the polaroid B is the same as that of the polaroid A; and the light emitted from the polaroid B enters the light collimator B and then enters the optical path of the optical fiber ring interferometer to be connected behind. The other path of light in the optical fiber ring interferometer light path is accessed from the light collimator B, and enters the optical fiber ring interferometer light path to be accessed through the polaroid B, the Faraday device B, the electro-optical crystal device A, the Faraday device A, the polaroid A and the optical fiber collimator A respectively.
The above-mentioned embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solution of the present invention by those skilled in the art should fall within the protection scope defined by the claims of the present invention without departing from the spirit of the present invention.
Claims (7)
1. A bi-crystal phase modulation apparatus for a fiber ring interferometer, comprising: the device comprises an optical fiber ring light path of an optical fiber ring interferometer, an optical fiber collimator A, a polaroid A, a Faraday optical rotator A, an electro-optic crystal device B, a Faraday optical rotator B, a polaroid B and an optical fiber collimator B;
the electro-optical crystal device A and the electro-optical crystal device B are mutually arranged at 90 degrees, a Faraday optical rotator A is arranged on the outer side of the electro-optical crystal device A, a polarizing plate A is arranged on the outer side of the Faraday optical rotator A, and an optical fiber collimator A is arranged on the outer side of the polarizing plate A; a Faraday optical rotator B is arranged on the outer side of the electro-optical crystal device B, a polarizing plate B is arranged on the outer side of the Faraday optical rotator B, and an optical fiber collimator B is arranged on the outer side of the polarizing plate B; the optical fiber collimator A, the polaroid A, the Faraday optical rotator A, the electro-optical crystal device B, the Faraday optical rotator B, the polaroid B and the optical fiber collimator B are linearly arranged; and the optical fiber collimator A or B is used for connecting the optical fiber loop light path of the optical fiber loop interferometer into the Faraday rotator A or B.
2. The apparatus of claim 1, wherein: the electro-optic crystal in the electro-optic crystal device A, B is a lithium niobate crystal.
3. The apparatus of claim 1, wherein: the angle of rotation of the two oppositely rotating Faraday rotator A, B is 450Respectively, outside the electro-optic crystal device A, B.
4. The apparatus of claim 1, wherein: a modulating voltage is applied across the electro-optic crystal device A, B to cause it to produce an electro-birefringence effect.
5. The apparatus of claim 1, wherein: the faraday rotator A, B has opposite handedness, and two electro-optical crystal devices A, B at 90 ° to each other are located in the middle of the two faraday rotators.
6. The apparatus of claim 1, wherein: the plane in which the principal axes of electrical induction in the electro-optic crystal device A, B lie is perpendicular to the direction of incident light.
7. A method of bi-crystal phase modulation for a fiber ring interferometer according to claim 1, comprising the steps of:
s1, connecting the Faraday rotator to the ring interferometer by using the optical fiber collimator, and introducing the Faraday rotator into the optical path;
s2, controlling the polarization direction of the light at the entrance of the Faraday rotator by using a polarizer;
s3, using two opposite rotation directions and 45 rotation angles0The Faraday optical rotation devices respectively rotate two paths of linearly polarized light with the same polarization direction, which is incident from the optical path of the optical fiber annular interferometer;
s4, controlling the optical rotation angle of the two Faraday rotator and the polarization direction of the polarized light incident from the outside to make the polarization direction of the emergent light rotate to the two electric induction main axis directions generated by the double refraction of the electro-optical crystal;
and S5, modulating the electro-optic phase delay of the electro-optic crystal by the change of the applied modulating voltage, and modulating the phase difference of linearly polarized light passing through the phase modulator from different ports.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013003072A (en) * | 2011-06-21 | 2013-01-07 | Nippon Telegr & Teleph Corp <Ntt> | Optical sensor and method for suppressing variation of sensitivity of optical sensor |
| CN203606417U (en) * | 2013-12-13 | 2014-05-21 | 国家电网公司 | Double-crystal optics voltage-sensing unit based on Pockel effect, and voltage transformer |
| CN110231024A (en) * | 2018-03-05 | 2019-09-13 | 李卫 | A kind of method and apparatus for optical fiber sagnac interferometer phase-modulation |
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- 2020-05-19 CN CN202010425686.4A patent/CN111781752A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013003072A (en) * | 2011-06-21 | 2013-01-07 | Nippon Telegr & Teleph Corp <Ntt> | Optical sensor and method for suppressing variation of sensitivity of optical sensor |
| CN203606417U (en) * | 2013-12-13 | 2014-05-21 | 国家电网公司 | Double-crystal optics voltage-sensing unit based on Pockel effect, and voltage transformer |
| CN110231024A (en) * | 2018-03-05 | 2019-09-13 | 李卫 | A kind of method and apparatus for optical fiber sagnac interferometer phase-modulation |
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Application publication date: 20201016 |