CN116953963A - All-fiber polarization-maintaining isolator with adjustable center wavelength - Google Patents
All-fiber polarization-maintaining isolator with adjustable center wavelength Download PDFInfo
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- CN116953963A CN116953963A CN202310837038.3A CN202310837038A CN116953963A CN 116953963 A CN116953963 A CN 116953963A CN 202310837038 A CN202310837038 A CN 202310837038A CN 116953963 A CN116953963 A CN 116953963A
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- 239000000835 fiber Substances 0.000 title claims abstract description 88
- 239000013307 optical fiber Substances 0.000 claims abstract description 116
- 230000010287 polarization Effects 0.000 claims abstract description 70
- 230000003287 optical effect Effects 0.000 claims abstract description 36
- 230000008859 change Effects 0.000 claims description 12
- 230000005540 biological transmission Effects 0.000 claims description 7
- 230000004313 glare Effects 0.000 claims description 5
- 230000009471 action Effects 0.000 claims description 4
- 230000002596 correlated effect Effects 0.000 claims description 3
- 230000004927 fusion Effects 0.000 claims description 3
- 230000001419 dependent effect Effects 0.000 claims description 2
- 238000000034 method Methods 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 8
- 239000000463 material Substances 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000005284 excitation Effects 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000004069 differentiation Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
Classifications
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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
- G02F1/095—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 in an optical waveguide structure
- G02F1/0955—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 in an optical waveguide structure used as non-reciprocal devices, e.g. optical isolators, circulators
Abstract
The invention discloses an all-fiber polarization-maintaining isolator with an adjustable center wavelength, which comprises a single polarization fiber I and a single polarization fiber II, a coiling optical fiber, wherein the coiling optical fiber is arranged between the single polarization fiber I and the single polarization fiber II, a magnetic field coil is arranged outside the coiling optical fiber, the coiling optical fiber is arranged inside the magnetic field coil in a coiling way, the magnetic field coil generates an annular magnetic field, the coiling direction of the coiling optical fiber is the same as the direction of the annular magnetic field, and the magnetic field coil is connected with external power supply equipment and a current controller through wires. The optical fiber structure can be realized through the optical rotation optical fiber, the light is not required to be led out and then led into the single-polarization optical fiber, the occurrence of break points can be avoided, the reliability is high, the adjustment of the center wavelength can be realized only by changing the coil current, the mass production and standardized production can be realized as all the material structures with different wavelengths are the same, and the rated current is calibrated for different wavelengths, so that the subsequent production and use are convenient.
Description
Technical Field
The invention relates to the field of light source devices, in particular to an all-fiber polarization-maintaining isolator with an adjustable center wavelength.
Background
The optical fiber isolator is used for preventing adverse effects of backward transmission light generated by various reasons in an optical path on a light source and an optical path system, and is widely applied to the fields of laser radars, optical fiber sensing and the like. The polarization maintaining fiber is a special fiber, the influence of the environment factors on the polarization state in the fiber in the transmission process is overcome by increasing the inherent birefringence performance of the fiber, the polarization state of the light wave transmitted in the fiber is kept unchanged, the stability and the communication capacity of an optical transmission system can be improved in the field of optical fiber communication, and the error caused by polarization coupling in an optical path can be obviously reduced in an optical fiber sensing system.
The existing optical isolator needs to collimate the light output of the optical fiber, add an isolation functional device, and then input the collimated light into the optical fiber to realize transmission isolation of the light. Thus, the light has a break point in the optical fiber, and the full optical fiber structure cannot be realized. The polarization maintaining optical isolator designed by the patent can perfectly realize no break point of a full optical path. Meanwhile, the isolators with different wavelengths cannot be used commonly, so that the manufacturing differentiation of the isolators is serious, and the universal isolator cannot be produced.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides an all-fiber polarization-maintaining isolator with an adjustable center wavelength, which can solve the technical problems.
In order to solve the technical problems, the invention provides the following technical scheme: the all-fiber polarization-maintaining isolator comprises a first single-polarization fiber and a second single-polarization fiber, wherein the first single-polarization fiber is an inlet end, the second single-polarization fiber is an outlet end, and the slow axis of the first single-polarization fiber and the slow axis of the second single-polarization fiber differ by 45 degrees;
the optical fiber is arranged between the first single-polarization optical fiber and the second single-polarization optical fiber, one end of the optical fiber is connected with the first single-polarization optical fiber, the other end of the optical fiber is connected with the second single-polarization optical fiber, and the optical fiber is connected with the first single-polarization optical fiber and the second single-polarization optical fiber in a fusion manner;
the magnetic field coil is arranged on the outer side of the coiled optical fiber, the coiled optical fiber is arranged on the inner side of the magnetic field coil in a coiling mode, the magnetic field coil generates an annular magnetic field, the coiling direction of the coiled optical fiber is the same as the direction of the annular magnetic field, and the magnetic field coil is connected with external power supply equipment and a current controller through wires.
As a preferable technical scheme of the invention, the first optical fiber connector and the second optical fiber connector are arranged on the coiling optical fiber, one end of the first optical fiber connector is connected with the coiling optical fiber, the other end of the first optical fiber connector is connected with the first single polarizing fiber, one end of the second optical fiber connector is connected with the coiling optical fiber, and the other end of the second optical fiber connector is connected with the second single polarizing fiber.
As a preferable technical scheme of the invention, the magnetic field strength formula is H=NxI/Le;
wherein H is the magnetic field intensity, N is the number of turns of the exciting coil, I is the exciting current, and Le is the effective magnetic path length;
the magnitude of the magnetic field at the coiled optical fiber is positively correlated with the magnitude of the current in the magnetic field coil.
As a preferred technical solution of the present invention, θ=vbl according to faraday rotation angle formula;
wherein V is the verdert constant of the optical fiber, B represents the magnetic field strength, and L represents the length of the optical fiber;
where V is wavelength dependent.
As a preferred embodiment of the present invention, the coiled optical fiber has a fixed length, and the optimal center wavelength of the isolator is related to the current on the magnetic field coil.
As a preferable technical scheme of the invention, the light enters the single-polarization optical fiber in the forward direction, and the isolator is smooth, and the method comprises the following steps:
s1, changing current of a magnetic field coil according to change of a glare coefficient caused by change of wavelength, wherein a current enhancement magnetic field becomes strong, the length of a coiled optical fiber is fixed, and the wavelength of slow axis optical rotation is changed by 45 degrees, so that the optimal center wavelength of an isolator is changed;
s2, inputting vertical slow axis light at the input end, enabling the light to enter a single polarization optical fiber I, enabling the polarization direction to be consistent with the slow axis direction of the single polarization optical fiber I, and enabling the polarization direction and energy of the polarized light to be transmitted to a coiled optical rotation optical fiber;
s3, under the action of the magnetic field coil, the coiled optical rotation fiber coiled in the magnetic field coil enables the vertical polarized light to rotate 45 degrees clockwise, and the vertical polarized light is output into the single polarized light fiber II from the coiled optical rotation fiber;
s4, the polarization direction of the light output from the coiled optical rotation fiber coincides with the slow axis direction of the single polarization fiber II, and the light is transmitted along the single polarization fiber II without damage.
As a preferred technical solution of the present invention, light enters in the opposite direction, and is isolated by an isolator, comprising the steps of:
s1, changing current of a magnetic field coil according to change of a glare coefficient caused by change of wavelength, wherein a current enhancement magnetic field becomes strong, the length of a coiled optical fiber is fixed, and the wavelength of slow axis optical rotation is changed by 45 degrees, so that the optimal center wavelength of an isolator is changed;
s2, light enters the second single-polarization optical fiber, the characteristics of the second single-polarization optical fiber only verify the transmission of light energy polarized in the 45-degree direction, other light is absorbed, and the light leaves the second single-polarization optical fiber to enter the coiled optical rotation optical fiber in the clockwise 45-degree direction;
s3, entering polarized light in the clockwise 45-degree direction into the coiled optical rotation fiber, enabling the incoming light to rotate in the clockwise 45-degree direction under the action of a magnetic field generated by the magnetic field coil, and enabling the light to rotate 90 degrees after passing through the optical rotation fiber;
s4, the light entering the single-polarized optical fiber I from the coiled optical rotation optical fiber, the polarization direction of the light is aligned with the fast axis of the single-polarized optical fiber I, the light can be absorbed by the single-polarized optical fiber I, and the reverse light can be completely absorbed.
As a preferable technical scheme of the invention, the magnetic field coil is connected with an external power supply, a current controller and a current sensor by adopting leads.
Compared with the prior art, the invention has the following beneficial effects:
according to the invention, an all-fiber structure can be realized through the optical rotation fiber, light is not required to be led into the single-polarization fiber after being led out, break points can be avoided, the reliability is high, meanwhile, the adjustment of the center wavelength can be realized only by changing coil current, the mass production and standardized production can be realized as all material structures with different wavelengths are the same, and the rated current is calibrated for different wavelengths, so that the subsequent production and use are convenient.
Drawings
FIG. 1 is a schematic diagram of a connection structure according to the present invention;
FIG. 2 is a schematic view of a partial enlarged structure of the portion A in FIG. 1 according to the present invention;
FIG. 3 is a schematic diagram of the operation of an optical isolator of the present invention;
FIG. 4 is a diagram showing the connection between the magnetic field coil and the external power source according to the present invention;
wherein: 1. a single polarization fiber I; 2. a single polarization fiber II; 3. coiling the optical fiber; 31. an optical fiber connector I; 32. an optical fiber connector II; 4. a magnetic field coil.
Detailed Description
In order that the manner in which the above recited features, objects and advantages of the present invention are obtained will become readily apparent, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings. Based on the examples in the embodiments, those skilled in the art can obtain other examples without making any inventive effort, which fall within the scope of the invention.
Examples
Referring to fig. 1-4, the invention provides an all-fiber polarization-maintaining isolator with an adjustable center wavelength, which comprises a single polarization fiber 1 and a single polarization fiber 2, wherein the single polarization fiber 1 is an inlet end, the single polarization fiber 2 is an outlet end, a phase difference of 45 degrees between a slow axis of the single polarization fiber 1 and a slow axis of the single polarization fiber 2 is provided with a coiling optical fiber 3 between the single polarization fiber 1 and the single polarization fiber 2, two ends of the coiling optical fiber 3 are respectively connected with the single polarization fiber 1 and the single polarization fiber 2 in a fusion manner, the coiling optical fiber 3 is arranged in a coiling manner, two ends on the coiling optical fiber 3 are respectively connected with an optical fiber connector 31 and an optical fiber connector 32, the optical fiber connector 31 is fused with the single polarization fiber 1, the optical fiber connector 32 is fused with the single polarization fiber 2, a wound magnetic field coil 4 is arranged on the outer side of the coiling optical fiber 3, the magnetic field coil 4 is connected with an external power supply, a current controller and a current sensor, and the coiling direction of the coiling optical fiber 3 is the same as the direction of an annular magnetic field;
according to a magnetic field intensity formula of H=N×I/Le, wherein H is magnetic field intensity, N is the number of turns of an excitation coil, I is excitation current, le is effective magnetic path length, the magnetic field size at the coiled optical fiber 3 is positively correlated with the current size in the magnetic field coil 4, a magnetic field is generated after the magnetic field coil 4 is electrified, the current passing through the magnetic field coil 4 can be changed through a current controller, and the magnetic field size generated on the magnetic field coil 4 can be changed through changing the current;
according to a Faraday rotation angle formula, θ=VBL, wherein V is the verdert constant of the optical fiber, B represents the magnetic field intensity, L represents the length of the optical fiber, wherein V is related to the wavelength, the optimal center wavelength of the isolator is related to the current on the magnetic field coil 4, the current of the magnetic field coil 4 is changed according to the change of the glare coefficient caused by the change of the wavelength, the current enhancement magnetic field is enhanced, the length of the coiled optical fiber 3 is fixed, the wavelength of the slow axis optical rotation 45 DEG is changed, the optimal center wavelength of the isolator is changed, the center wavelength can be changed by changing the current, a rated current can be calibrated for different wavelengths, and the production and the use are convenient;
as shown in fig. 1, 3 and 4, the components are connected according to the specification, an external power supply supplies power to the magnetic field coil 4, a current controller is used for changing the current passing through the magnetic field coil 4, changing the magnetic field generated by the magnetic field coil 4, adjusting the current to a proper size according to the wavelength requirement, the optical fiber characteristic of the single polarization optical fiber is that the optical energy in the direction of the slow axis of the optical fiber is transmitted in a lossless manner, the polarized light in the direction of the fast axis can be completely absorbed, when the light enters in the forward direction, the light enters into the single polarization optical fiber 1, the polarized light keeps the polarization direction and energy transmission due to the fact that the polarization direction is identical with the slow axis of the single polarization optical fiber 1, the polarized light is transmitted into the coiled optical fiber 3, the vertical polarized light is clockwise rotated by 45 degrees and then transmitted into the single polarization optical fiber 2 due to the effect of the magnetic field, the slow axis of the single polarization optical fiber 2 is 45 degrees different from the slow axis of the single polarization optical fiber 1, the light transmitted from the coiled optical fiber 3 is just coincident with the slow axis of the single polarization optical fiber 2, and the light is transmitted along the single polarization optical fiber 2;
when light enters in the reverse direction, the second single-polarization optical fiber 2 verifies that polarized light in the 45 DEG passes through and absorbs other light, the light polarized in the 45 DEG clockwise direction enters the coiled optical fiber 3, the coiled optical fiber 3 rotates the light by 45 DEG clockwise, the polarized light of 45 DEG is converted into 90 DEG to enter the first single-polarization optical fiber 1, and at the moment, the polarization direction of the light is aligned with the fast axis of the first single-polarization optical fiber 1 and is absorbed, and the reverse light cannot be transmitted.
The foregoing has shown and described the basic principles, principal features and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the above-described embodiments, and that the above-described embodiments and descriptions are only preferred embodiments of the present invention, and are not intended to limit the invention, and that various changes and modifications may be made therein without departing from the spirit and scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (8)
1. The utility model provides an all-fiber polarization-maintaining isolator with adjustable center wavelength, includes single partial fiber one (1) and single partial fiber two (2), single partial fiber one (1) is the advance end, single partial fiber two (2) are the play end, phase difference 45 between the slow axis of single partial fiber one (1) and the slow axis of single partial fiber two (2), its characterized in that:
the optical fiber (3) is arranged between the single polarization fiber I (1) and the single polarization fiber II (2), one end of the optical fiber (3) is connected with the single polarization fiber I (1), the other end of the optical fiber (3) is connected with the single polarization fiber II (2), and the optical fiber (3) is connected with the single polarization fiber I (1) and the single polarization fiber II (2) in a fusion mode;
the magnetic field coil (4), the magnetic field coil (4) sets up in coiling optical rotation optic fibre (3) outside, and coiling optical rotation optic fibre (3) adopt the mode of coiling to set up in magnetic field coil (4) inboard, and magnetic field coil (4) produce annular magnetic field, and the direction that coiling optical rotation optic fibre (3) coiled is the same with annular magnetic field's direction, and magnetic field coil (4) are connected through the electric wire with external power equipment and current controller.
2. The all-fiber polarization maintaining isolator with adjustable center wavelength according to claim 1, wherein:
the optical fiber coiling device is characterized in that an optical fiber connector I (31) and an optical fiber connector II (32) are arranged on the optical fiber coiling device (3), one end of the optical fiber connector I (31) is connected with the optical fiber coiling device (3), the other end of the optical fiber connector I is connected with the single polarization optical fiber I (1), one end of the optical fiber connector II (32) is connected with the optical fiber coiling device (3), and the other end of the optical fiber connector II is connected with the single polarization optical fiber II (2).
3. The all-fiber polarization maintaining isolator with adjustable center wavelength according to claim 1, wherein:
h=n×i/Le according to the magnetic field strength formula;
wherein H is the magnetic field intensity, N is the number of turns of the exciting coil, I is the exciting current, and Le is the effective magnetic path length;
the magnitude of the magnetic field at the coiled optical fiber (3) is positively correlated with the magnitude of the current in the magnetic field coil (4).
4. The all-fiber polarization maintaining isolator with adjustable center wavelength according to claim 1, wherein:
θ=vbl according to faraday rotation angle formula;
wherein V is the verdert constant of the optical fiber, B represents the magnetic field strength, and L represents the length of the optical fiber;
where V is wavelength dependent.
5. A center wavelength tunable all-fiber polarization maintaining isolator as claimed in claim 3, wherein:
the length of the coiled optical fiber (3) is fixed, and the optimal center wavelength of the isolator is related to the current on the magnetic field coil (4).
6. The all-fiber polarization maintaining isolator with adjustable center wavelength according to claim 1, wherein:
the light enters the single-polarization optical fiber in the forward direction, the isolator is smooth, and the method comprises the following steps:
s1, changing current of a magnetic field coil (4) according to change of a glare coefficient caused by change of wavelength, enabling a current enhancement magnetic field to be strong, fixing the length of a coiled optical fiber (3), and changing the wavelength of slow axis optical rotation by 45 degrees so as to change the optimal center wavelength of an isolator;
s2, inputting vertical slow axis light at the input end, enabling the light to enter a single polarization optical fiber I (1), enabling the polarization direction to be consistent with the slow axis direction of the single polarization optical fiber I (1), and enabling the polarization direction and energy of the polarized light to be transmitted to a coiled optical rotation optical fiber (3);
s3, under the action of the magnetic field coil (4), the coiled optical rotation fiber (3) coiled in the magnetic field coil (4) enables the vertical polarized light to rotate 45 degrees clockwise, and the vertical polarized light is output into the single polarization fiber II (2) from the coiled optical rotation fiber (3);
s4, the polarization direction of the light output from the coiled optical rotation fiber (3) is overlapped with the slow axis direction of the single polarization fiber II (2), and the light is transmitted along the single polarization fiber II (2) without damage.
7. The all-fiber polarization maintaining isolator with adjustable center wavelength according to claim 1, wherein:
light enters in the reverse direction, and is isolated by an isolator, comprising the following steps:
s1, changing current of a magnetic field coil (4) according to change of a glare coefficient caused by change of wavelength, enabling a current enhancement magnetic field to be strong, fixing the length of a coiled optical fiber (3), and changing the wavelength of slow axis optical rotation by 45 degrees so as to change the optimal center wavelength of an isolator;
s2, light enters the single polarization fiber II (2), only the light energy transmission polarized in the 45-degree direction is verified, other light is absorbed, and the light leaves the single polarization fiber II (2) in the clockwise 45-degree direction and enters the coiled optical rotation fiber (3).
S3, light polarized in the clockwise 45-degree direction enters the coiling optical rotation fiber (3), the coiling optical rotation fiber (3) can enable the incoming light to rotate in the clockwise 45-degree direction under the action of a magnetic field generated by the magnetic field coil (4), and after the incoming light passes through the optical rotation fiber, the light is rotated by 90 degrees;
s4, the light entering the single polarization fiber I (1) from the coiled optical rotation fiber (3) is aligned with the fast axis of the single polarization fiber I (1), the light is absorbed by the single polarization fiber I, and the reverse light is completely absorbed.
8. The all-fiber polarization maintaining isolator with adjustable center wavelength according to claim 1, wherein:
the magnetic field coil (4) is connected with an external power supply, a current controller and a current sensor by adopting leads.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310837038.3A CN116953963A (en) | 2023-07-10 | 2023-07-10 | All-fiber polarization-maintaining isolator with adjustable center wavelength |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310837038.3A CN116953963A (en) | 2023-07-10 | 2023-07-10 | All-fiber polarization-maintaining isolator with adjustable center wavelength |
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| Publication Number | Publication Date |
|---|---|
| CN116953963A true CN116953963A (en) | 2023-10-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310837038.3A Pending CN116953963A (en) | 2023-07-10 | 2023-07-10 | All-fiber polarization-maintaining isolator with adjustable center wavelength |
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2023
- 2023-07-10 CN CN202310837038.3A patent/CN116953963A/en active Pending
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