CN116299818A - Reflective Polarization Maintaining Optics - Google Patents
Reflective Polarization Maintaining Optics Download PDFInfo
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- CN116299818A CN116299818A CN202310202087.XA CN202310202087A CN116299818A CN 116299818 A CN116299818 A CN 116299818A CN 202310202087 A CN202310202087 A CN 202310202087A CN 116299818 A CN116299818 A CN 116299818A
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/20—Filters
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/10—Beam splitting or combining systems
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/28—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising
- G02B27/283—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising used for beam splitting or combining
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/28—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising
- G02B27/283—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising used for beam splitting or combining
- G02B27/285—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising used for beam splitting or combining comprising arrays of elements, e.g. microprisms
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/28—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising
- G02B27/286—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising for controlling or changing the state of polarisation, e.g. transforming one polarisation state into another
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/30—Collimators
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/0056—Means for improving the coupling-out of light from the light guide for producing polarisation effects, e.g. by a surface with polarizing properties or by an additional polarizing elements
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/27—Optical coupling means with polarisation selective and adjusting means
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/32—Optical coupling means having lens focusing means positioned between opposed fibre ends
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Abstract
The utility model provides a reflective polarization maintaining optical device, which comprises at least one group of collimator arrays, wherein one group of collimator arrays comprises more than two polarization maintaining collimators; one end of the collimator array is provided with a polarization maintaining transmission assembly, and the polarization maintaining transmission assembly consists of an optical rotation device, a light combining and splitting device, a polarization state conversion device, a light filtering device array and a reflecting device which are sequentially arranged on a light path; the optical rotation device receives an optical signal with a preset polarization state output by a polarization-preserving collimator, and rotates the polarization state of the incident optical signal by a preset angle in the normal direction; the position of the optical signal incident from the optical rotation device to the optical combining and splitting device is offset from the position of the optical signal incident from the polarization conversion device to the optical combining and splitting device. The utility model can reduce the volume of the optical device and the port expansion of the optical device is very convenient.
Description
Technical Field
The utility model relates to an optical device, in particular to a reflective polarization maintaining optical device with small volume.
Background
Various optical devices are widely used in the current optical fiber communication system, wherein an optical circulator and an optical isolator are common optical devices. The optical circulator is a multi-port nonreciprocal optical device, and has the function of enabling optical signals to be transmitted along a specified port sequence, so that bidirectional optical signal transmission on a single optical fiber is realized. Typically, an optical circulator has three or more ports, as shown in fig. 1, the optical circulator has four ports, namely ports 11, 12, 13, 14, and when an optical signal enters the optical circulator from port 11, the optical signal is output from port 12 with little loss, and the other ports have little optical output; when the optical signal enters the optical circulator from port 12, the optical signal is output from port 13 with little loss, and the other ports have little optical output, and so on. The optical circulator has the advantage of non-reciprocity, so that the optical circulator becomes an important device in two-way communication and can complete the separation task of forward and reverse transmission light.
The utility model patent application with publication number of CN114594549A discloses a two-dimensional array type multi-path multiport optical circulator which is provided with a collimator array, a half-wave plate group, an optical rotation device, a polarization state conversion device and a reflection device, wherein an optical signal can only be emitted from a specific other collimator after being emitted from one collimator of the collimator array. However, such an optical circulator cannot realize a polarization maintaining function, that is, cannot ensure that the polarization state of an outgoing optical signal coincides with the polarization state of an incoming optical signal. With the increasing demand for optical devices in the field of optical communications, it is desirable to be able to use optical circulators that have polarization preserving capabilities for the polarization state of optical signals.
The utility model patent application with publication number of CN1438505A discloses a four-port polarization maintaining circulator, which uses more devices, particularly two non-reciprocal devices, has a complex structure and a large volume, and does not meet the requirement of miniaturization of the current optical devices. In addition, the circulator is also provided with a polarization beam splitter prism, so that polarization maintaining can be realized only for optical signals transmitted in a specific direction, and polarization maintaining can not be realized for optical signals passing through a forward optical path only, and the optical signals can be subjected to polarization maintaining only through forward and backward optical paths in sequence.
The utility model patent with publication number of CN210720813U discloses a reflective optical circulator, which has a complex structure and has the problem of overlarge volume. In addition, the port number of the circulator is limited, the expansion is difficult, and the popularization and the use of the optical circulator are limited.
Disclosure of Invention
The utility model aims to provide a reflective polarization maintaining optical device which is small in size and can ensure that the polarization states of an incident light signal and an emergent light signal are consistent.
In order to achieve the above object, the reflective polarization maintaining optical device provided by the present utility model includes at least one set of collimator arrays, where a set of collimator arrays includes more than two polarization maintaining collimators; one end of the collimator array is provided with a polarization maintaining transmission assembly, and the polarization maintaining transmission assembly consists of an optical rotation device, a light combining and splitting device, a polarization state conversion device, a light filtering device array and a reflecting device which are sequentially arranged on a light path; the optical rotation device receives an optical signal with a preset polarization state output by a polarization-preserving collimator, and rotates the polarization state of the incident optical signal by a preset angle in the normal direction; the light-combining light-splitting device receives the light signal passing through the light-splitting device, the light signal passing through the light-combining light-splitting device is incident to the polarization state conversion device, the polarization state conversion device converts the light signal into circularly polarized light, the light filtering device filters the incident light signal, the reflecting device reflects the incident light signal, the reflected light signal passes through the light filtering device and the polarization state conversion device again, the polarization state conversion device converts the circularly polarized light into linear polarized light, the converted linear polarized light is incident to the light-combining light-splitting device, and the light signal emitted from the light-combining light-splitting device passes through the light-splitting device, rotates in the opposite polarization state direction by a preset angle and is emitted from the other polarization-preserving collimator; wherein the position of the optical signal incident from the optical rotation device to the light combining and splitting device is offset from the position of the optical signal incident from the polarization conversion device to the light combining and splitting device.
According to the scheme, after the optical signal with the specific polarization state enters the optical rotation device from one polarization-preserving collimator, the polarization state rotates in the normal direction by a preset angle, the optical signal is transmitted by the light-combining and light-splitting device through the extraordinary ray and is converted into circularly polarized light after passing through the polarization state conversion device, the polarization state of the optical signal cannot be changed when passing through the optical filtering device and the reflecting device, the polarization state of the reflected optical signal is converted into linearly polarized light after passing through the polarization state conversion device, and the optical signal is transmitted by the ordinary ray through the light-combining and light-splitting device, so that the position of the optical signal is deviated, and finally the optical signal can be emitted from the other polarization-preserving collimator, and the unidirectional transmission function of the optical signal is realized. And the polarization state of the optical signal after passing through the optical rotation device again is rotated by a preset angle in the reverse direction, so that the polarization state of the emitted optical signal is the same as that of the incident optical signal, and the polarization maintaining function is realized.
In addition, the polarization-preserving transmission assembly only comprises an optical rotation device, a light combination and splitting device, a polarization state conversion device, a light filtering device array and a reflecting device, so that the number of the used devices is small, the volume of the optical device can be reduced, and the miniaturization of the optical device is facilitated.
In a preferred embodiment, the set of collimator arrays is made up of a plurality of single collimators, each comprising a single lens and a single optical fiber, the single lens being located between the single optical fiber and the polarization maintaining transmission assembly; or the collimator array is composed of an optical fiber array and a lens array, the optical fiber array comprises a plurality of optical fibers, the lens array comprises a plurality of lenses, and the lens array is positioned between the optical fiber array and the polarization maintaining transmission assembly.
It follows that the configuration of the collimator array may be varied, and may be implemented using a single collimator or using a fiber array and a lens array, depending on the actual needs, both implementations providing greater flexibility for the application of the optical device.
Further, the collimator array comprises two polarization maintaining collimators, wherein one polarization maintaining collimator is an isolated input end, and the other polarization maintaining collimator is an isolated output end.
It follows that the optical device can be used as a polarization maintaining isolation device by using only two polarization maintaining collimators as the isolation input and the isolation output, respectively.
In a further aspect, the set of collimator arrays includes more than three polarization maintaining collimators, and the light signal incident from one polarization maintaining collimator can only exit from a specific other polarization maintaining collimator.
Through setting up the polarization maintaining collimator more than three, optical device can regard as the circulator to use, and optical device's mode of use is more nimble.
In a further scheme, a plurality of polarization maintaining collimators of a group of collimator arrays are arranged in parallel and side by side, and a plurality of groups of collimator arrays are arranged in more than two rows.
Thus, the collimator array has a more compact structure, which is beneficial to the miniaturization of optical devices.
In a further aspect, the light combining and splitting device is a birefringent crystal or a polarizing beam splitter prism, and preferably, the optical rotation device includes a first faraday rotator.
Still further, the polarization conversion device is a quarter wave plate or a second faraday rotator.
Therefore, the quarter wave plate or the second Faraday rotator can conveniently convert linear polarized light into circularly polarized light or convert circularly polarized light into linear polarized light, and the device has simple structure and low production cost.
In a further scheme, the optical filter device array comprises more than two optical filters, and each optical filter is arranged on one optical path.
Therefore, the optical filter is arranged on the optical path, so that the optical signal with a specific wavelength can pass through the optical filter, and the optical device also has the filtering function.
Further, the filter wavelengths of the plurality of filters are the same, or the filter wavelength of one filter is different from the filter wavelength of the other filter.
Therefore, when the optical device is a circulator under the condition that the filtering wavelengths of the plurality of optical filters are different, the optical circulator can have a unidirectional transmission function on the optical signals with specific wavelengths, and the use requirements under special scenes are met.
Drawings
Fig. 1 is a functional schematic of an optical circulator.
Fig. 2 is a front view of a first embodiment of the present utility model.
Fig. 3 is a top view of a first embodiment of the present utility model.
Fig. 4 is a schematic structural view of a collimator array according to a first embodiment of the utility model.
Fig. 5 is a schematic structural view of an array of optical filter devices according to a first embodiment of the present utility model.
Fig. 6 is a schematic structural view of a collimator array according to a second embodiment of the utility model.
The utility model is further described below with reference to the drawings and examples.
Detailed Description
The reflective polarization maintaining optical device can be used as a polarization maintaining circulator or a polarization maintaining isolator, and can ensure that the polarization state of an optical signal entering the reflective polarization maintaining optical device is the same as the polarization state of an optical signal exiting the reflective polarization maintaining optical device. In addition, the reflective polarization maintaining optical device has small volume, and the port number is easy to expand, thereby being beneficial to popularization and application of the optical device.
First embodiment:
referring to fig. 2 and 3, the reflective polarization maintaining optical device of the present embodiment is a reflective polarization maintaining circulator, and a collimator array 10 is provided, where the collimator array 10 of the present embodiment includes three polarization maintaining collimators, namely, polarization maintaining collimators 11, 12 and 13, and the three polarization maintaining collimators are arranged in a row. A polarization maintaining transmission assembly is disposed at one end of the collimator array 10, and the polarization maintaining transmission assembly of this embodiment includes an optical rotation device 20, a light combining and splitting device 30, a polarization state conversion device 40, a light filtering device array 50, and a reflection device 60, which are sequentially disposed.
The collimator array 10 may be implemented in a variety of ways, one way being that the collimator array 10 is made up of a plurality of single collimators, each comprising a single lens and a single optical fiber, the single lens being located between the single optical fiber and the polarization maintaining transmission assembly, and the optical signal passing through the single optical fiber and then entering the polarization maintaining transmission assembly through the single lens. Alternatively, the collimator array 10 is composed of an optical fiber array including a plurality of optical fibers and a lens array including a plurality of lenses, the lens array being located between the optical fiber array and the polarization maintaining transmission assembly. Preferably, the number of optical fibers of the optical fiber array is equal to the number of lenses of the lens array, each optical fiber is equal to one lens, and an optical signal emitted from one optical fiber enters the polarization maintaining transmission assembly through the corresponding lens.
In this embodiment, the optical circulator with three ports is a three-port optical circulator, the optical signal incident from the polarization maintaining collimator 11 can only exit from the polarization maintaining collimator 12, the optical signal incident from the polarization maintaining collimator 12 can only exit from the polarization maintaining collimator 13, and the optical path is irreversible, so that the optical signal incident from the polarization maintaining collimator 13 will not exit from any polarization maintaining collimator.
In the polarization-preserving transmission assembly of the present embodiment, the optical rotation device 20, the light-combining and light-splitting device 30, the polarization state conversion device 40, the light-filtering device array 50 and the reflection device 60 are sequentially arranged on the optical path, that is, after the optical signal is incident to the polarization-preserving transmission assembly through the lens, the optical rotation device 20, the light-combining and light-splitting device 30, the polarization state conversion device 40, the light-filtering device array 50 and the reflection device 60 are sequentially passed through.
The optical rotation device 20 of the present embodiment includes a first faraday rotator which exhibits different properties to polarized light under different magnetic fields, for example, under a saturated magnetic field, by energizing the magnet such that the magnet is changed by a magnet provided at an outer periphery of the first faraday rotator, and which has an optical rotation effect on a linear polarization state such that the linear polarization light is rotated by a preset angle, for example, by 45 °.
Under the saturated magnetic field, the optical rotation angle of the Faraday rotation piece is related to the wavelength of the optical signal and the thickness of the Faraday rotation piece, and for the optical signal with a specific wavelength, the polarization state of the optical signal needs to be rotated 45 degrees clockwise or anticlockwise, and then the minimum thickness of the Faraday rotation piece is a fixed value, so that the thickness of the first Faraday rotation piece can be set according to the wavelength requirement of the optical signal incident on the optical device, and the optical signal incident on the first Faraday rotation piece can be rotated clockwise or anticlockwise by a preset angle.
The light combining and splitting device 30 of the present embodiment may be a birefringent crystal or a polarizing beam splitting prism, and after the linearly polarized light is incident on the light combining and splitting device 30, the linearly polarized light propagates in an extraordinary or ordinary mode according to the polarization state of the optical signal. When an optical signal propagates as an extraordinary ray or an ordinary ray, a position within the light-combining spectroscopic device 30 is shifted, that is, an optical path for an optical signal of the same wavelength, if propagating as an extraordinary ray, is different from an optical path propagating as an ordinary ray. Therefore, by controlling the polarization state of the optical signal when it is incident on the light-combining and light-splitting device 30, the optical signal can be propagated as an extraordinary ray or an ordinary ray, so that the propagation paths of the optical signals are made different, and unidirectional propagation of the optical signal can be achieved.
The polarization state transforming device 40 may be a quarter wave plate or a second faraday rotator for effecting a change in the polarization state of the optical signal. In the present embodiment, the polarization conversion device 40 needs to convert linearly polarized light into circularly polarized light or circularly polarized light into linearly polarized light. If a quarter wave plate is used, the optical axis of the quarter wave plate needs to be set to a preset direction so that the polarization state of the optical signal can be changed in a preset manner, i.e. linearly polarized light is converted into circularly polarized light. If the polarization state conversion device 40 is a second faraday rotator, the thickness of the second faraday rotator needs to be set according to the wavelength of the optical signal so that the desired conversion of the polarization state of the optical signal can occur.
The filter device array 50 of the present embodiment includes a plurality of filters, and as shown in fig. 5, the filter device array 50 includes two filters 51, 52 disposed adjacently, each of the filters 51, 52 being disposed on one optical path, for example, the filter 51 being disposed on an optical path that enters from the polarization maintaining collimator 11 and exits from the polarization maintaining collimator 12, and the filter 51 being disposed on an optical path that enters from the polarization maintaining collimator 12 and exits from the polarization maintaining collimator 13. The filter wavelengths of the two filters 51 and 52 are the same, or the filter wavelengths of the two filters 51 and 52 are different. For example, the filter wavelengths of the two filters 51, 52 may each be λ1, or the filter 51 may be λ1 and the filter 52 may be λ2. The filter wavelengths of the two filters 51, 52 can be set according to the actual use requirements.
The filter assembly 50 is configured to enable the reflective polarization maintaining optical device to have a filtering function, i.e., to allow only optical signals with specific wavelengths to pass through, i.e., to emit optical signals with specific wavelengths. If the filtering wavelengths of the two filters 51 and 52 are different, the filtering wavelengths are different for different light paths, so that the use requirement under specific use situations can be met, and especially when the reflective polarization maintaining optical device is used as an optical circulator, the filtering wavelengths of the optical signals incident from the polarization maintaining collimator 11 and the optical signals incident from the polarization maintaining collimator 12 are different. Since the polarization maintaining collimator 13 is only used as an outgoing port when the polarization maintaining collimator is applied as an optical circulator, no optical filter is arranged on the optical path corresponding to the polarization maintaining collimator 13.
The reflecting device 60 is a mirror, the reflecting device 60 is disposed at a position farthest from the collimator array 10, and the light signal will be reflected after being incident on the reflecting device 60, and the reflected light signal will be incident on the filter assembly 50 again.
The working principle of the present embodiment will be described with reference to fig. 3. Taking the optical path in which the optical signal is incident from the polarization maintaining collimator 11 and exits from the polarization maintaining collimator 12 as an example, assuming linear polarized light incident to the polarization maintaining collimator 11, the polarization state of the incident optical signal is expressed as follows using the jones matrix
I.e. the polarization state of the optical signal with respect to the z-axis and the x-axisAll form an included angle of 45 degrees. The incoming optical signal passes through the first faraday rotator of optical device 20 with the polarization rotated 45 ° clockwise, where the polarization of the optical signal is parallel to the z-axis, denoted +.>
Then, the optical signal is incident into the birefringent crystal 30, and after being incident into the birefringent crystal 30 as extraordinary ray e-ray, the optical signal passes through the birefringent crystal 30 and passes through the polarization conversion device 40, the optical signal is changed from linear polarized light to right-handed circularly polarized light by using a quarter wave plate as the polarization conversion device 40, and the jones matrix is expressed as
The optical signal is then incident into the filter 51 of the filter set 50. In the present embodiment, the filter 51 has a filtering wavelength λ1, that is, only the optical signal having the wavelength λ1 can pass through the filter 51, and the optical signal having the other wavelength cannot pass through the filter 51. Since the filter 51 does not change the polarization state of the optical signal, the polarization state of the optical signal passing through the filter 51 is not changed, or is circularly polarized. Finally, the optical signal is incident on the reflecting device 60, and the optical signal is emitted by the reflecting device 60 without changing the polarization state.
The reflected light signal will pass through the optical filter 51 again, the polarization state will not change, and the circularly polarized light will enter the polarization state conversion device 40 again after passing through the optical filter 51. Since the optical signal incident on the quarter wave plate is right circularly polarized light, the polarization state of the optical signal will change, and the optical signal is converted into linear polarized light, which is expressed as follows using the jones matrix
I.e. the polarization state is parallel to the x-axis. It can be seen that the polarization state of the optical signal passing through the polarization state conversion device 40 again is perpendicular to the initial incidence to the polarization state conversion deviceThe polarization state of the optical signal at 40.
The optical signal passing through the polarization conversion device 40 will be incident again on the light combining spectroscopic device 30, at which time the optical signal propagates as ordinary ray o-ray. The optical signal propagates with the extraordinary ray when entering the light-combining and light-splitting device 30 for the first time, and propagates with the ordinary ray when passing through the light-combining and light-splitting device 30 for the second time, and the positions of the optical signals propagated for the two times are shifted, so that the optical signal exiting from the light-combining and light-splitting device 30 can exit from the polarization-preserving collimator 12, that is, the incident polarization-preserving collimator is different from the exiting polarization-preserving collimator.
After exiting the light combining and splitting device 30, the optical signal is incident again on the first faraday rotator of the optical rotation device 20, and the polarization state of the optical signal is deflected again, specifically, the optical signal is rotated by 45 ° counterclockwise, that is, the optical signal is rotated by 45 ° in the opposite direction, and the optical signal passes through the optical rotation device 20 twice and rotates by the same angle but in opposite directions.
Since the polarization state of the optical signal is parallel to the x-axis at this time, the polarization state of the rotated optical chip is 45 DEG to the z-axis, expressed as Jones matrix
It can be seen that the polarization state of the optical signal at this time is the same as the polarization state of the optical signal incident on the polarization maintaining collimator 11, and is also a linear polarization state. Finally, the optical signal reaches the polarization maintaining collimator 12 and leaves the optics as linearly polarized light.
It can be seen that the polarization state of the linearly polarized light incident on the optical device is the same as the polarization state leaving the optical device, and the polarization maintaining effect is achieved in this embodiment.
The working principle of the light signal entering from the polarization maintaining collimator 12 and leaving from the polarization maintaining collimator 13 is the same as the working principle of the light signal entering from the polarization maintaining collimator 11 and leaving from the polarization maintaining collimator 12, and will not be described again.
Second embodiment:
the reflective polarization maintaining optical device of this embodiment is a reflective polarization maintaining circulator, and is provided with a collimator array, and a polarization maintaining transmission assembly is provided at one end of the collimator array, and the polarization maintaining transmission assembly of this embodiment includes an optical rotation device, a light combining and splitting device, a polarization state conversion device, a light filtering device array, and a reflective device that are sequentially provided. Unlike the first embodiment, this embodiment is provided with two sets of collimator arrays, as shown in fig. 6, each set of collimator arrays is provided with three polarization maintaining collimators, for example, the first set of collimator arrays is provided with three polarization maintaining collimators 111, 112, 113, and the second set of collimator arrays is provided with three polarization maintaining collimators 114, 115, 116. The three polarization maintaining collimators of each collimator array are arranged in a row, and the two collimator arrays are arranged side by side.
In other embodiments, more than three collimator arrays may be provided, with multiple collimator arrays arranged in multiple rows. Alternatively, two or three collimator arrays are arranged in a straight line.
Third embodiment:
the reflective polarization maintaining optical device of this embodiment is a reflective polarization maintaining optical isolator, and is provided with a collimator array, and a polarization maintaining transmission assembly is provided at one end of the collimator array, and the polarization maintaining transmission assembly of this embodiment includes an optical rotation device, a light combining and splitting device, a polarization state conversion device, a light filtering device array, and a reflective device that are sequentially provided.
Unlike the first embodiment, the collimator array of this embodiment has only two polarization maintaining collimators, and since the optical signal can only exit from the second polarization maintaining collimator after entering from the first polarization maintaining collimator, the optical signal entering from the second polarization maintaining collimator cannot exit from the first polarization maintaining collimator, and therefore, the first polarization maintaining collimator is used as an isolation input end, the second polarization maintaining collimator is an isolation output end, and the optical device realizes an optical isolation function.
The optical device of the present utility model uses few devices, can reduce the volume of the optical device, and can realize miniaturization of the optical device. Furthermore, if the ports of the optical device need to be increased, for example, the number of polarization-maintaining collimators is increased, only one or more groups of collimator arrays need to be increased, and the expansion of the ports is very convenient.
Of course, the above-mentioned embodiments are only preferred embodiments of the present utility model, and many more modifications, such as a change in the arrangement of the collimator arrays of each group in the optical device, etc., are also included in the scope of the claims.
Claims (10)
1. The reflective polarization maintaining optical device is characterized in that: comprising
At least one set of collimator arrays, one set of collimator arrays comprising more than two polarization maintaining collimators;
one end of the collimator array is provided with a polarization maintaining transmission assembly, and the polarization maintaining transmission assembly consists of an optical rotation device, a light combining and splitting device, a polarization state conversion device, a light filtering device array and a reflecting device which are sequentially arranged on a light path;
the optical rotation device receives the optical signal with the preset polarization state output by one polarization-preserving collimator, and rotates the polarization state of the incident optical signal by a preset angle in the normal direction;
the light-combining and light-splitting device receives the light signal passing through the optical rotation device, the light signal passing through the light-combining and light-splitting device is incident to the polarization state conversion device, the polarization state conversion device converts the light signal into circularly polarized light, the light filtering device filters the incident light signal, the reflecting device reflects the incident light signal, the reflected light signal passes through the light filtering device and the polarization state conversion device again, the polarization state conversion device converts the circularly polarized light into linear polarized light, the converted linear polarized light is incident to the light-combining and light-splitting device, the polarization state of the light signal emitted from the light-combining and light-splitting device is rotated by the preset angle in the reverse direction after passing through the optical rotation device, and the light signal is emitted from the other polarization-preserving collimator;
wherein the position of the optical signal incident from the optical rotation device to the light combining and splitting device is offset from the position of the optical signal incident from the polarization conversion device to the light combining and splitting device.
2. The reflective polarization maintaining optical device of claim 1, wherein:
a set of said collimator arrays consisting of a plurality of single collimators, each of said single collimators comprising a single lens and a single optical fiber, said single lens being located between said single optical fiber and said polarization-preserving transmission assembly; or alternatively
The collimator array comprises an optical fiber array and a lens array, wherein the optical fiber array comprises a plurality of optical fibers, the lens array comprises a plurality of lenses, and the lens array is positioned between the optical fiber array and the polarization-maintaining transmission assembly.
3. The reflective polarization maintaining optical device of claim 1, wherein:
the collimator array comprises two polarization maintaining collimators, wherein one polarization maintaining collimator is an isolated input end, and the other polarization maintaining collimator is an isolated output end.
4. The reflective polarization maintaining optical device of claim 1, wherein:
a set of said collimator arrays comprises more than three of said polarization maintaining collimators, an optical signal incident from one of said polarization maintaining collimators only being able to exit from a specific other of said polarization maintaining collimators.
5. The reflective polarization maintaining optical device according to any one of claims 1 to 4, wherein:
the polarization maintaining collimators of the collimator arrays are parallel and arranged side by side, and the collimator arrays are arranged in more than two rows.
6. The reflective polarization maintaining optical device according to any one of claims 1 to 4, wherein:
the light-combining and light-splitting device is a birefringent crystal or a polarization beam-splitting prism.
7. The reflective polarization maintaining optical device according to any one of claims 1 to 4, wherein:
the optical rotation device includes a first Faraday rotator.
8. The reflective polarization maintaining optical device according to any one of claims 1 to 4, wherein:
the polarization state conversion device is a quarter wave plate or a second Faraday rotator.
9. The reflective polarization maintaining optical device according to any one of claims 1 to 4, wherein:
the optical filter device array comprises more than two optical filters, and each optical filter is arranged on one optical path.
10. The reflective polarization maintaining optical device of claim 9, wherein:
the filtering wavelengths of the plurality of the optical filters are the same, or the filtering wavelength of one optical filter is different from the filtering wavelength of the other optical filter.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN120491247A (en) * | 2025-07-21 | 2025-08-15 | 广东三石园科技有限公司 | Reflective optical circulator and manufacturing method thereof |
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| CN103955026A (en) * | 2014-05-23 | 2014-07-30 | 福州百讯光电有限公司 | Optical circulator based on optical fiber and lens array |
| CN211206847U (en) * | 2019-12-26 | 2020-08-07 | 珠海光库科技股份有限公司 | Reflective optical circulator |
| CN114594549A (en) * | 2022-03-10 | 2022-06-07 | 广东三石园科技有限公司 | Two-dimensional array type multi-channel multi-port optical circulator |
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| CN103955026A (en) * | 2014-05-23 | 2014-07-30 | 福州百讯光电有限公司 | Optical circulator based on optical fiber and lens array |
| CN211206847U (en) * | 2019-12-26 | 2020-08-07 | 珠海光库科技股份有限公司 | Reflective optical circulator |
| CN114594549A (en) * | 2022-03-10 | 2022-06-07 | 广东三石园科技有限公司 | Two-dimensional array type multi-channel multi-port optical circulator |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN120491247A (en) * | 2025-07-21 | 2025-08-15 | 广东三石园科技有限公司 | Reflective optical circulator and manufacturing method thereof |
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