CN114217435A - Device and method for improving spectral resolution of flexible spectral shaper - Google Patents
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- 238000000034 method Methods 0.000 title claims abstract description 29
- 239000013307 optical fiber Substances 0.000 claims abstract description 22
- 230000003287 optical effect Effects 0.000 claims description 21
- 239000000835 fiber Substances 0.000 claims description 15
- 238000007493 shaping process Methods 0.000 claims description 7
- 238000001228 spectrum Methods 0.000 abstract description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 230000001154 acute effect Effects 0.000 description 2
- 239000005350 fused silica glass Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
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- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
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Abstract
The utility model relates to a device and method for improving the spectral resolution of a flexible spectrum former, which comprises an optical fiber collimator array, a virtual imaging phase array, a first Y-direction lens, an X-direction lens and a space light phase modulator, wherein the optical fiber collimator array converts light beams in optical fibers into space light, the virtual imaging phase array reflects the space light to form a plurality of virtual sources, the first Y-direction lens separates each virtual source according to the wavelength and outputs the space light with different wavelengths, the X-direction lens converges the space light output by the first Y-direction lens, the space light phase modulator receives the space light converged by the X-direction lens, switches and shapes the space light, and returns the processed space light to different ports of the optical fiber collimator array. The method and the device can improve the spectral resolution, avoid the problem of the diffraction grating intensive scribing process, and well solve the problems that the diffraction performance is difficult to improve and the cost is too high.
Description
Technical Field
The application relates to the technical field of optical communication, in particular to a device and a method for improving spectral resolution of a flexible spectral shaper.
Background
Due to the limitation of the production process, the high spectral resolution and low loss near infrared Grating can only achieve about 1000 lines/mm (line/mm), which greatly limits the manufacture of high precision wave beam generators.
The flexible spectrum shaper can flexibly modulate the spectral width and the intensity of an input wide-spectrum optical signal. However, conventional flexible spectral shapers typically only have resolutions greater than 15GHz, which is mainly caused by the finite angular dispersion of the diffraction grating. Conventional diffraction gratings have reached a bottleneck due to process engineering problems, and the cost required for denser grooves is also extremely high.
Disclosure of Invention
The embodiment of the application provides a device and a method for improving the spectral resolution of a flexible spectral shaper, which can improve the spectral resolution, avoid the problem of a diffraction grating intensive scribing process, and well solve the problems that the diffraction performance is difficult to improve and the cost is too high.
In a first aspect, there is provided an apparatus for improving spectral resolution of a flexible spectral shaper, comprising:
a fiber collimator array for converting the light beam in the optical fiber into spatial light;
a virtual imaging phased array for reflecting the spatial light to form a plurality of virtual sources;
a first Y-direction lens for separating each virtual source according to wavelength size and outputting spatial light of different wavelengths;
an X-direction lens for converging the spatial light output by the first Y-direction lens, wherein the X direction and the Y direction are perpendicular to each other;
and the spatial light phase modulator is used for receiving the spatial light converged by the X-direction lens, performing switching and beam shaping processing on the received spatial light, and returning the processed spatial light to different ports of the optical fiber collimator array.
In some embodiments, the apparatus further includes a second Y-direction lens, and the second Y-direction lens is configured to expand the spatial light output by the fiber collimator array, and send the expanded spatial light to the virtual imaging phase array.
In some embodiments, the apparatus further comprises a controller coupled to the spatial light phase modulator and configured to control LCOS gray scale of the spatial light phase modulator.
In some embodiments, the angle of incidence θ of all wavelengths of spatial light on the virtual imaging phased array is 30 °.
In some embodiments, when the thickness h of the virtual imaging phased array is 0.5mm and the height L is 24mm, in the spatial light passing through the virtual imaging phased array, the optical path difference between the spatial light with the maximum optical path and the spatial light with the minimum optical path is 0.5m, and the spectral resolution is 0.5 GHz.
In a second aspect, a method for improving spectral resolution of a flexible spectral shaper is provided, comprising the steps of:
converting the light beams in the optical fibers into space light by adopting an optical fiber collimator array;
reflecting the space light by adopting a virtual imaging phase array to form a plurality of virtual sources;
separating each virtual source according to the wavelength by adopting a first Y-direction lens, and outputting space light with different wavelengths;
converging the space light output by the first Y-direction lens by adopting an X-direction lens, wherein the X direction is vertical to the Y direction;
and receiving the spatial light converged by the X-direction lens by using a spatial light phase modulator, switching and shaping the received spatial light, and returning the processed spatial light to different ports of the optical fiber collimator array.
In some embodiments, the method further comprises the steps of: and expanding the spatial light output by the optical fiber collimator array by adopting a second Y-direction lens, and sending the spatial light after being expanded to the virtual imaging phase array.
In some embodiments, the method further comprises the steps of: and controlling the LCOS gray scale of the spatial light phase modulator.
In some embodiments, the angle of incidence θ of all wavelengths of spatial light on the virtual imaging phased array is 30 °.
In some embodiments, the virtual imaging phased array has a thickness h of 0.5mm and a height L of 24mm, and in the spatial light passing through the virtual imaging phased array, an optical path difference between the spatial light with the maximum optical path and the spatial light with the minimum optical path is 0.5m, and the spectral resolution is 0.5 GHz.
The beneficial effect that technical scheme that this application provided brought includes:
the method and the device can improve spectral resolution, use the virtual imaging phase array, avoid the problem of the diffraction grating intensive scribing process, and solve the problems that diffraction performance is difficult to promote and cost is too high.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic view of an apparatus for improving spectral resolution of a flexible spectral shaper according to an embodiment of the present disclosure;
fig. 2 is a schematic view of another perspective view of an apparatus for improving spectral resolution of a flexible spectral shaper according to an embodiment of the present disclosure.
In the figure: 1. an array of fiber collimators; 2. a second Y-direction lens; 3. a virtual imaging phased array; 4. a first Y-direction lens; 5. an X-direction lens; 6. a spatial optical phase modulator.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Referring to fig. 1 and 2, an embodiment of the present application provides an apparatus for improving spectral resolution of a flexible spectral shaper, the apparatus includes a fiber collimator array 1, a virtual imaging phase array 3, a first Y-direction lens 4, an X-direction lens 5, and a spatial light phase modulator 6, the fiber collimator array 1 is configured to convert a light beam in an optical fiber into spatial light, the virtual imaging phase array 3 is configured to reflect the spatial light to form a plurality of virtual sources, the first Y-direction lens 4 is configured to separate each virtual source according to a wavelength size and output spatial light with different wavelengths, the X-direction lens 5 is configured to converge the spatial light output by the first Y-direction lens 4, wherein an X direction is perpendicular to a Y direction, the spatial light phase modulator 6 is configured to receive the spatial light converged by the X-direction lens 5, perform switching and beam shaping processing on the received spatial light, and returns the processed spatial light to different ports of the fiber collimator array 1.
Specifically, referring to fig. 1 and 2, after the spatial light output from the fiber collimator array 1 is reflected between two surfaces of a virtual imaging phased array 3 (VIPA), a virtual source is generated, so as to form a phase array, and then the phase array passes through a first Y-direction lens 4, is separated according to different wavelengths, and outputs spatial light with different wavelengths, an X-direction lens 5 converges the spatial light, a spatial light phase modulator 6 receives the spatial light converged by the X-direction lens 5, and performs switching and beam shaping processes on the received spatial light, and finally returns the processed spatial light to different ports of the fiber collimator array 1, for example, in fig. 2, a solid line a is the spatial light incident to the spatial light phase modulator 6 at a first incident angle, a dotted line b is the spatial light returned to the fiber collimator array 1 at a first exit angle, the dotted line c is the spatial light that is modulated and then returns to the fiber collimator array 1 at the second exit angle, and the port of the fiber collimator array 1 when the solid line a enters is different from the ports when the dotted line b and the dotted line c return to the fiber collimator array 1.
Referring to fig. 1, in the drawing, m-1 corresponds to the spatial light with the minimum optical path, m +1 corresponds to the spatial light with the maximum optical path, and when the thickness h of the virtual imaging phased array 3 is 0.5mm and the height L is 24mm, the optical path difference between the two is 0.5m, which is equivalent to the 2ns time delay in the fused quartz. The reciprocal of the time delay can find that the spectral resolution of the virtual imaging phased array 3 can reach 0.5GHz, while the maximum of the flexible spectral shapers manufactured by the conventional diffraction grating is 5GHz, and the spectral resolution provided by the application is higher than that provided by the conventional diffraction grating by more than one order of magnitude.
Therefore, the method and the device can improve the spectral resolution, use the virtual imaging phase array, avoid the problem of the diffraction grating intensive scribing process, and well solve the problems that the diffraction performance is difficult to improve and the cost is too high.
Referring to fig. 1, in some preferred embodiments, the apparatus further includes a second Y-direction lens 2, where the second Y-direction lens 2 is configured to expand the spatial light output by the fiber collimator array 1 and send the expanded spatial light to the virtual imaging phase array 3.
It should be noted that, in the arrangement, the fiber collimator array 1 and the spatial light phase modulator 6 need to be placed on the front and rear focal planes of the X-direction lens 5, respectively.
To reduce the occupied space, the X-direction lens 5 may be generally placed between the second Y-direction lens 2 and the virtual imaging phased array 3.
For example, a cylindrical lens may be used for both the X-direction lens and the Y-direction lens, and other types of lenses that can achieve the above object may be used.
Further, the apparatus further comprises a controller, which is connected to the spatial light phase modulator 6 and is configured to control the LCOS gray scale of the spatial light phase modulator 6.
The incident angle θ of the spatial light with all wavelengths on the virtual imaging phased array 3 is an acute angle, and as for the value of the specific incident angle θ, the value can be determined according to the actual needs and the material of the virtual imaging phased array 3, and preferably, the incident angle θ of the spatial light with all wavelengths on the virtual imaging phased array 3 is 30 °.
Referring to fig. 1 and 2, an embodiment of the present application further provides a method for improving spectral resolution of a flexible spectral shaper, including the following steps:
101: converting light beams in the optical fibers into space light by adopting an optical fiber collimator array 1;
102: expanding the spatial light output by the optical fiber collimator array 1 by using a second Y-direction lens 2, sending the spatial light after expanding to a virtual imaging phase array 3, and reflecting the spatial light by using the virtual imaging phase array 3 to form a plurality of virtual sources;
103: separating each virtual source according to the wavelength by adopting a first Y-direction lens 4, and outputting space light with different wavelengths;
104: converging the space light output by the first Y-direction lens 4 by adopting an X-direction lens 5, wherein the X direction is vertical to the Y direction;
105: the spatial light phase modulator 6 is adopted to receive the spatial light converged by the X-direction lens 5, the silicon-based Liquid Crystal On Silicon (LCOS) gray scale of the spatial light phase modulator 6 is controlled, the received spatial light is switched and subjected to beam shaping, and the processed spatial light is returned to different ports of the optical fiber collimator array 1.
Referring to fig. 1, in the drawing, m-1 corresponds to the spatial light with the minimum optical path, m +1 corresponds to the spatial light with the maximum optical path, and when the thickness h of the virtual imaging phased array 3 is 0.5mm and the height L is 24mm, the optical path difference between the two is 0.5m, which is equivalent to the 2ns time delay in the fused quartz. The reciprocal of the time delay can find that the spectral resolution of the virtual imaging phased array 3 can reach 0.5GHz, while the maximum of the flexible spectral shapers manufactured by the conventional diffraction grating is 5GHz, and the spectral resolution provided by the application is higher than that provided by the conventional diffraction grating by more than one order of magnitude.
Therefore, the method can improve the spectral resolution, avoid the problem of the diffraction grating intensive scribing process by using the virtual imaging phase array, and well solve the problems of difficulty in improving the diffraction performance and overhigh cost.
The incident angle θ of the spatial light with all wavelengths on the virtual imaging phased array 3 is an acute angle, and the value of the specific incident angle θ can be determined according to actual needs and the material of the virtual imaging phased array 3, and further, the incident angle θ of the spatial light with all wavelengths on the virtual imaging phased array 3 is 30 °.
In the description of the present application, it should be noted that the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are only for convenience in describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present application. Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
It is noted that, in the present application, relational terms such as "first" and "second", and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The above description is merely exemplary of the present application and is presented to enable those skilled in the art to understand and practice the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. An apparatus for improving spectral resolution of a flexible spectral shaper, comprising:
a fiber collimator array (1) for converting the light beam in the optical fiber into spatial light;
a virtual imaging phased array (3) for reflecting the spatial light to form a plurality of virtual sources;
a first Y-direction lens (4) for separating each virtual source according to wavelength and outputting spatial light of different wavelengths;
an X-direction lens (5) for converging the spatial light output by the first Y-direction lens (4), wherein the X direction and the Y direction are perpendicular to each other;
and the spatial light phase modulator (6) is used for receiving the spatial light converged by the X-direction lens (5), performing switching and beam shaping processing on the received spatial light, and returning the processed spatial light to different ports of the optical fiber collimator array (1).
2. The apparatus for improving spectral resolution of a flexible spectral shaper according to claim 1, wherein: the device further comprises a second Y-direction lens (2), wherein the second Y-direction lens (2) is used for expanding the spatial light output by the optical fiber collimator array (1) and sending the spatial light after being expanded to the virtual imaging phase array (3).
3. The apparatus for improving spectral resolution of a flexible spectral shaper according to claim 1, wherein: the device also comprises a controller, wherein the controller is connected with the spatial light phase modulator (6) and is used for controlling the LCOS gray scale of the spatial light phase modulator (6).
4. The apparatus for improving spectral resolution of a flexible spectral shaper according to claim 1, wherein: the incident angle theta of all wavelengths of spatial light on the virtual imaging phased array (3) is 30 deg..
5. The apparatus for improving spectral resolution of a flexible spectral shaper according to claim 1, wherein: when the thickness h of the virtual imaging phase array (3) is 0.5mm and the height L of the virtual imaging phase array is 24mm, the optical path difference between the spatial light with the maximum optical path and the spatial light with the minimum optical path in the spatial light passing through the virtual imaging phase array (3) is 0.5m, and the spectral resolution is 0.5 GHz.
6. A method of improving spectral resolution of a flexible spectral shaper, comprising the steps of:
converting the light beams in the optical fibers into space light by adopting an optical fiber collimator array (1);
reflecting the spatial light by using a virtual imaging phased array (3) to form a plurality of virtual sources;
separating each virtual source according to the wavelength by adopting a first Y-direction lens (4), and outputting space light with different wavelengths;
converging the space light output by the first Y-direction lens (4) by adopting an X-direction lens (5), wherein the X direction is vertical to the Y direction;
and receiving the spatial light converged by the X-direction lens (5) by using a spatial light phase modulator (6), switching and beam shaping the received spatial light, and returning the processed spatial light to different ports of the optical fiber collimator array (1).
7. The method for improving spectral resolution of a flexible spectral shaper according to claim 6, further comprising the steps of: and expanding the spatial light output by the optical fiber collimator array (1) by using a second Y-direction lens (2), and sending the spatial light after being expanded to the virtual imaging phase array (3).
8. The method for improving spectral resolution of a flexible spectral shaper according to claim 6, further comprising the steps of: and controlling the LCOS gray scale of the spatial light phase modulator (6).
9. The method of improving spectral resolution of a flexible spectral shaper according to claim 6, wherein: the incident angle theta of all wavelengths of spatial light on the virtual imaging phased array (3) is 30 deg..
10. The method of improving spectral resolution of a flexible spectral shaper according to claim 6, wherein: the thickness h of the virtual imaging phase array (3) is 0.5mm, the height L of the virtual imaging phase array is 24mm, in the space light passing through the virtual imaging phase array (3), the optical path difference between the space light with the maximum optical path and the space light with the minimum optical path is 0.5m, and the spectral resolution is 0.5 GHz.
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