Dispersion compensation device and dispersion compensation method

Abstract

The present specification discloses a dispersion compensation apparatus and a dispersion compensation method. The dispersion compensation device comprises at least a first compensation element and a second compensation element, each compensation element comprising a refractive interface and a reflective interface. The to-be-compensated light beam is propagated between the compensation elements in a normal incidence / normal emergence propagation form based on the refraction interface, and the propagation direction and the incidence and emergence positions of the to-be-compensated light beam in the compensation elements are changed based on the reflection interface; the to-be-compensated light beam is reflected between the first compensation element and the second compensation element for at least two rounds and then is emitted from the at least two compensation elements. In the dispersion compensation equipment provided by the specification, a light beam to be compensated is spread among compensation elements in a normal incidence / normal emergence mode under the non-dispersive condition, and is reflected for multiple rounds through a first compensation element and a second compensation element which are arranged in a relatively staggered manner; on the basis of a simple optical structure, high-limit dispersion compensation is realized.

Description

Technical Field

[0001] The present invention relates to the field of optical signal propagation, and in particular to a dispersion compensation device and a dispersion compensation method. Background Art

[0002] During the transmission of optical signals, due to the influence of the transmission medium and the optical structure in the propagation optical path, the optical signal may experience dispersion. Dispersion refers to the phenomenon that when light propagates in a medium, light of different wavelengths has different propagation speeds, resulting in the separation of the light spectrum.

[0003] Chromatic dispersion can have a significant impact on optical signal transmission, including but not limited to signal distortion, increased crosstalk, transmission distance limitation, signal attenuation, etc. Therefore, how to solve the problem of chromatic dispersion of optical signals during transmission is a technical problem that needs to be solved urgently by those skilled in the art. Summary of the invention

[0004] In view of this, the embodiments of the present specification provide a dispersion compensation device and a dispersion compensation method, which can achieve dispersion compensation for a light beam to be compensated by using a compensation medium with a dispersion condition opposite to that of the light beam to be compensated, thereby overcoming the shortcomings of the prior art.

[0005] In a first aspect, an embodiment of the present application provides a dispersion compensation device, which comprises at least a first compensation element and a second compensation element, each of which comprises a refractive interface and a reflective interface. A light beam to be compensated is vertically incident from the refractive interface of the first compensation element, vertically emitted from the refractive interface of the second compensation element, propagates between the compensation elements in a propagation form of normal incidence / normal emission based on the refractive interface, and changes the propagation direction and the incident and emission positions of the light beam to be compensated in the compensation element based on the reflective interface, so that the light beam to be compensated is emitted from at least two compensation elements after at least two rounds of reflection between the first compensation element and the second compensation element. The first compensation element and the second compensation element are arranged relative to each other based on the first refractive interface and staggered in the first direction, and the light beam to be compensated propagates between the first compensation element and the second compensation element based on the overlapping part of the first refractive interface, and the incident and emission positions of the overlapping part are changed by the reflective interface to achieve at least two rounds of reflection.

[0006] In some embodiments of the present specification, the reflective interface includes a first reflective interface and a second reflective interface that are arranged opposite to each other, and corresponding positions of the first reflective interface and the second reflective interface are perpendicular to each other.

[0007] In some embodiments of the present specification, the first reflective interface and the second reflective interface both form an angle of 45° with the first direction.

[0008] In certain embodiments of the present specification, a portion of the interface in the refractive interface arranged along the second direction between the second reflective interface and the first refractive interface forms a second refractive interface; the light beam to be compensated is vertically emitted from the compensation element from the second refractive interface of the second compensation element; and / or a portion of the interface in the refractive interface arranged along the second direction between the first reflective interface and the first refractive interface forms a third refractive interface; the light beam to be compensated is vertically emitted into the compensation element from the third refractive interface of the first compensation element.

[0009] In some embodiments of the present specification, the light beam to be compensated vertically exits the second compensation element from the intersecting portion of the first refractive interface; and / or the light beam to be compensated vertically enters the first compensation element from the intersecting portion of the first refractive interface.

[0010] In some embodiments of the present specification, the dispersion compensation device further includes: a translation stage, configured to adjust the relative positions of the first compensation element and the second compensation element, so as to adjust the reflection rounds of at least two rounds of reflection.

[0011] In a second aspect, an embodiment of the present application provides a dispersion compensation method, which is applied to a dispersion compensation device of some embodiments of the first aspect, and the method includes: adjusting the relative position of a first compensation element and a second compensation element based on a displacement stage in the dispersion compensation device, and curing the dispersion compensation device based on the relative position.

[0012] In certain embodiments of the present specification, adjusting the relative positions of at least two compensation elements based on a displacement stage in a dispersion compensation device includes: determining a dispersion parameter of a light beam to be compensated. Determining the number of reflection rounds of the light beam to be compensated in the dispersion compensation device according to the dispersion parameter of the light beam to be compensated. Determining the target relative positions of the compensation elements in the dispersion compensation device based on the reflection rounds. Sending the target relative positions to the displacement stage so that the displacement stage adjusts the relative positions.

[0013] In a third aspect, an embodiment of the present application provides a compensation element, which includes: two parallel interfaces, wherein the two parallel interfaces are arranged in parallel and have a staggered area in a second direction; two reflective interface groups, wherein the reflective interface groups correspond to the parallel interfaces and are arranged based on the staggered area of ​​the corresponding parallel interfaces, and are used to reflect light beams that are parallelly incident on the reflective interface groups or light beams that are vertically incident from the staggered area, so that the light beams are emitted in parallel from different positions of the reflective interface groups; the two reflective interface groups are arranged relatively to each other, so that light beams emitted in parallel from one reflective interface group are emitted in parallel to the other reflective interface group; wherein the light beam to be compensated is emitted vertically from the staggered area of ​​the parallel interfaces, and propagates between the two reflective interface groups of the compensation element in the propagation form of normal incidence / normal emission based on the reflective interface groups, and the propagation direction and incident and emission positions of the light beam to be compensated in the compensation element are changed based on the reflective interface groups, so that the light beam to be compensated is emitted vertically from the staggered area after at least two rounds of reflection in the compensation element.

[0014] In certain embodiments of the present specification, the reflective interface group includes a first reflective interface and a second reflective interface; wherein the first reflective interface is arranged based on the staggered area of ​​the corresponding parallel interface so that the light beam vertically incident on the staggered area is reflected at the first reflective interface, and the second reflective interface is arranged between the first reflective interface and the corresponding parallel interface, the first reflective interface and the second reflective interface are perpendicular to each other, and form an angle of 45° or 135° with the second direction.

[0015] The embodiments of the present specification provide a dispersion compensation device and a dispersion compensation method based on adaptive optics. In the dispersion compensation device provided in the present specification, the light beam to be compensated is propagated between the compensation elements without dispersion by means of normal incidence / normal emission, and multiple rounds of reflection are performed by relatively staggered first compensation elements and second compensation elements, thereby achieving a higher amount of dispersion compensation based on a relatively simple optical structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 It is a schematic diagram of the compensation principle of a dispersion compensation device provided by an exemplary embodiment of this specification.

[0018] Figure 2 It is a schematic diagram of the structure of a compensation element provided by an exemplary embodiment of this specification.

[0019] Figure 3 It is a schematic diagram of the structure of another compensation element provided by an exemplary embodiment of this specification.

[0020] Figure 4 It is a schematic diagram of the structure of a dispersion compensation device provided by an exemplary embodiment of this specification.

[0021] Figure 5 This is a schematic diagram of the structure of another dispersion compensation device provided by an exemplary embodiment of this specification.

[0022] Figure 6 It is an exemplary flow chart of a dispersion compensation method provided by an exemplary embodiment of this specification.

[0023] Figure 7 It is a structural schematic diagram of another compensation element provided by an exemplary embodiment of this specification.

[0024] Figure 8 It is a schematic diagram of the structure of another compensation element provided by an exemplary embodiment of this specification.

[0025] Among them, 100, dispersion compensation device; 200, compensation beam; 110, first compensation element; 120, second compensation element; 111, refraction interface; 112, reflection interface; 130, overlapping part; 1111, first refraction interface; 140, first position; 150, second position; 1121, first reflection interface; 1122, second reflection interface; 160, compensation element; 170, compensation element; 1621, first reflection interface; 1611, first refraction interface; 1613, third refraction interface; 1722, second reflection interface; 1711, first refraction interface; 1712, second refraction interface; 180, compensation element; 181, first reflection interface; 182, second reflection interface; 183, refraction interface. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0027] Application Overview:

[0028] In the transmission process of optical signals, the dispersion of optical signals can generally be divided into normal dispersion and anomalous dispersion according to the distribution of wavelengths. Among them, in normal dispersion, long-wavelength light propagates faster than short-wavelength light in the material. Anomalous dispersion is the opposite.

[0029] In actual signal transmission, normal dispersion is generally formed based on the transmission medium. For example, common materials such as glass and water exhibit normal dispersion in the visible light range. Anomalous dispersion is generally formed based on the propagation structure. For example, the scattering phenomenon that occurs during beam propagation often exhibits anomalous dispersion after collimation.

[0030] To compensate for anomalous dispersion, two technical means are generally used in related technologies: one is to compensate based on normal dispersion materials, and the other is to separate the light beams and compensate for different components one by one.

[0031] In the above compensation technology, there are at least the following technical problems:

[0032] Compensation based on normal dispersion materials generally involves passing the signal to be compensated through the normal dispersion material, and stepping the abnormal dispersion based on the compensation path of the signal to be compensated in the normal dispersion material. However, the compensation capacity of normal dispersion materials is limited. When the degree of dispersion is large, it is difficult to construct a sufficiently long compensation path.

[0033] The one-by-one compensation of the separated components requires a more complex compensation device, and the compensation capacity is also limited.

[0034] In order to solve the problem of dispersion compensation (especially anomalous dispersion compensation), the present application provides a dispersion compensation device. In the dispersion compensation device provided in this specification, the light beam to be compensated is propagated between the compensation elements without dispersion by means of normal incidence / normal emission, and multiple rounds of reflection are performed by the first compensation element and the second compensation element arranged relatively staggered, so that a higher amount of dispersion compensation is achieved based on a relatively simple optical structure. Various non-limiting embodiments of the present application will be specifically described below with reference to the accompanying drawings.

[0035] Exemplary dispersion compensation devices:

[0036] To further describe the dispersion compensation device provided by the present application. The present application provides a compensation principle diagram of the dispersion compensation device ( Figure 1 ) and the schematic diagram of a single compensation element ( Figure 2 ). Figure 1 , Figure 2 The dispersion compensation device provided in this application is described.

[0037] Figure 1 It is a schematic diagram of the compensation principle of a dispersion compensation device provided by an exemplary embodiment of this specification. Figure 1 It can be presented as a cross-sectional view of the dispersion compensation device 100 on the propagation plane of the light beam 200 to be compensated. That is, the propagation direction of the light beam 200 to be compensated can be Figure 1 The direction of the plane (such as the x-axis direction, the y-axis direction).

[0038] In some embodiments, Figure 1 The x-axis direction (also recorded as the horizontal direction) in the figure can be the propagation direction of the light beam 200 to be compensated during multiple rounds of reflections in the dispersion compensation device 100, and the y-axis direction (also recorded as the vertical direction) is Figure 1 The direction perpendicular to the horizontal direction in the plane shown. Figure 1 The dispersion compensation device 100 is set when the propagation direction of the light beam 200 to be compensated is known, and the horizontal direction and the vertical direction are determined according to the propagation direction of the light beam 200 to be compensated, and then the setting method of the internal structure is determined.

[0039] It should be noted that the dispersion compensation device provided in the present application only needs to meet the relevant technical requirements of the present application on the propagation plane of the light beam to be compensated. A person skilled in the art can adaptively adjust the actual structure of the dispersion compensation device. For example, a person skilled in the art can set each element in the dispersion compensation device as a columnar body, and extend the columnar body in a direction perpendicular to the propagation plane of the light beam to be compensated, so that the dispersion compensation device only needs to meet the technical requirements of the present application on the propagation plane of the light beam to be compensated.

[0040] like Figure 1 As shown, the dispersion compensation device 100 can perform at least two rounds of reflection on the light beam to be compensated 200, thereby achieving compensation for the light beam to be compensated 200. The dispersion coefficient of the optical element through which the light beam to be compensated 200 passes is opposite to that of the light beam to be compensated. That is, for the light beam to be compensated containing anomalous dispersion, the element in the dispersion compensation device 100 can be a normal dispersion element.

[0041] Specifically, during compensation, the light beam 200 to be compensated is emitted from the first compensation element 110 and emitted from the second compensation element 120. Between the first compensation element 110 and the second compensation element 120, the light beam 200 to be compensated propagates back and forth between the first compensation element 110 and the second compensation element 120, and undergoes at least two rounds of reflection. The number of reflection rounds of the light beam 200 to be compensated between the first compensation element 110 and the second compensation element 120 (i.e., the number of reflection rounds of the light beam 200 to be compensated) is related to the number of times the light beam 200 to be compensated returns from the second compensation element 120 to the first compensation element 110. Specifically, the number of reflection rounds may be the number of returns + 1.

[0042] Exemplarily, when the light beam 200 to be compensated goes from the first compensation element 110 to the second compensation element 120, the number of returns from the second compensation element 120 to the first compensation element 110 in the process is 0, and the number of reflection rounds is 1. When the light beam 200 to be compensated goes from the first compensation element 110 to the second compensation element 120 to the first compensation element 110 and then to the second compensation element 120, the number of returns in the process is 1, and the number of reflection rounds is 2. Figure 1 The number of reflection rounds shown is 2.

[0043] The first compensation element 110 and the second compensation element 120 are core compensation elements of the dispersion compensation device 100. The dispersion coefficients of the first compensation element 110 and the second compensation element 120 are opposite to those of the light beam 200 to be compensated, and the dispersion compensation of the light beam 200 to be compensated can be achieved through multiple rounds of reflection of the light beam 200 to be compensated on the first compensation element 110 and the second compensation element 120.

[0044] To achieve the aforementioned multiple rounds of reflection, the compensation element includes a refractive interface and a reflective interface. Taking the first compensation element 110 as an example, the first compensation element 110 may include a refractive interface 111 and a reflective interface 112. The refractive interface 111 may be used to achieve the entry and exit of the light beam 200 to be compensated in the first compensation element 110. The reflective interface 112 may adjust the refraction position of the light beam 200 to be compensated at the refractive interface 111 by reflecting the light beam 200 to be compensated.

[0045] In order to avoid dispersion of the light beam 200 to be compensated in the compensation element, the light beam 200 to be compensated can propagate between the compensation elements in the form of normal incidence / normal emission based on the refractive interface, and change the propagation direction and the incident and emission positions of the light beam 200 to be compensated in the compensation element based on the reflective interface to achieve the aforementioned multiple rounds of reflection. Among them, normal incidence / normal emission will not produce dispersion.

[0046] In some embodiments, in order to achieve the aforementioned change in the incident and outgoing positions of the compensation light beam 200, the compensation light beam 200 is reflected twice at the reflection interface. Specifically, the compensation light beam 200 is reflected twice at the reflection interface and may include a first reflection and a second reflection. Both the first reflection and the second reflection are total reflections, and the sum of the reflection angles of the first reflection and the second reflection is 90 degrees, so as to ensure that the light before the first reflection and the light after the second reflection are parallel and perpendicular to the refractive interface. For details on the implementation principle of the reflection interface, please refer to Figure 2 and its related description.

[0047] Based on the aforementioned refractive interface and reflective interface, when the first compensation element 110 and the second compensation element 120 are arranged relative to each other based on the first refractive interface and are staggered in the first direction (i.e., the vertical direction), the light beam 200 to be compensated propagates between the first compensation element 110 and the second compensation element 120 based on the overlapping portion 130 of the first refractive interface, and the incident and exit positions at the overlapping portion 130 are changed by the reflective interface to achieve at least two rounds of reflection. Among them, the portion of the refractive interface arranged toward the opposite refractive interface is recorded as the first refractive interface, which is generally Figure 1 The portion of the medium refractive interface 111 extending in the vertical direction.

[0048] like Figure 1 As shown, when the light beam 200 to be compensated is at the overlapping portion 130 of the first refractive interface from the exit position of the second compensation element 120 in this round of reflection, the compensation light beam 200 needs to undergo at least one more round of reflection. When the light beam 200 to be compensated is at the intersecting portion of the first refractive interface from the exit position of the second compensation element 120 in this round of reflection, the compensation light beam 200 can leave the first compensation element 110 and the second compensation element 120 to end the multiple rounds of reflection.

[0049] In some embodiments, for the convenience of setting, the first compensation element 110 and the second compensation element 120 are generally constructed using the same optical element. That is, the first compensation element 110 and the second compensation element 120 are generally the same within the tolerance range. It should be noted that the present application does not limit the relevant parameters of the first compensation element 110 and the second compensation element 120. For example, the dispersion coefficient and size of the first compensation element 110 and the second compensation element 120 can be modified according to actual needs, and the two can also select different design parameters according to actual needs.

[0050] Based on the above-mentioned design, in the dispersion compensation device provided in this specification, the light beam to be compensated is propagated between the compensation elements without dispersion through the normal incidence / normal exit method, and multiple rounds of reflection are performed through the relatively staggered first compensation element and the second compensation element, thereby extending the path of the light beam to be compensated in the compensation element, thereby achieving a higher amount of dispersion compensation based on a relatively simple optical structure.

[0051] It should be noted that the refractive interface and the reflective interface in the present application are distinguished based on the relationship with the light beam to be compensated. In practice, the refractive interface and the reflective interface can be the same or similar optical structure. For example, the refractive interface and the reflective interface can both serve as the edge of the compensation element. In some embodiments, in order to achieve the corresponding process, the optical structure where the refractive interface and the reflective interface are located can be processed. For example, a reflective coating can be applied to the edge where the reflective interface is located to achieve total reflection at all angles.

[0052] In some embodiments, based on Figure 1 In the dispersion compensation device 100 shown, the compensation light beam 200 can be vertically emitted from the second compensation element 120 from the staggered portion of the first refractive interface, and vertically emitted from the staggered portion of the first refractive interface to the first compensation element 110. The staggered portion may refer to a portion of the first refractive interface of the first compensation element 110 and the second compensation element 120 that does not overlap in the horizontal direction.

[0053] In some embodiments, based on the above compensation device, the position where the compensation light beam 200 enters the first compensation element 110, that is, the position of the staggered portion of the first refractive interface, can be adjusted to adjust the number of reflection rounds of the compensation light beam 200 between the first compensation element 110 and the second compensation element 120, thereby achieving multiple rounds of reflection. Figure 2 As shown, the number of reflection rounds of the compensation light beam 200 between the first compensation element 110 and the second compensation element 120 is three.

[0054] Figure 3 is a schematic diagram of the structure of a compensation element provided by an exemplary embodiment of this specification. Figure 3Taking the first compensation element as an example, the propagation of the light beam to be compensated inside the compensation element is demonstrated. Figure 3 The presentation method and Figure 1 The same, no further elaboration is needed here.

[0055] like Figure 3 As shown, the first compensation element 110 may include a refractive interface 111 and a reflective interface 112 . The refractive interface 111 may specifically include a first refractive interface 1111 .

[0056] When the light beam 200 to be compensated enters the first compensation element 110 from the first refractive interface 1111, the light beam 200 to be compensated is reflected for the first time at the first position 140 of the reflective interface 112, and is reflected for the second time at the second position 150. The angle between the light beam 200 to be compensated and the normal line of the first position 140 (the reflection angle of the light beam 200 to be compensated at the first position 140) can be recorded as the first reflection angle A1, and the angle between the light beam 200 to be compensated and the normal line of the first position 140 can be recorded as the second reflection angle A2. Based on the above, it can be known that the first reflection angle A1+the second reflection angle A2=90°. Combined with the properties of the normal line and the tangent line, it is easy to prove that the light beam of the light beam 200 to be compensated before the first reflection angle A1 is parallel to the light beam after the second reflection angle A2. When the first refractive interface 1111 extends in the vertical direction, the light beam 200 to be compensated can be incident vertically on the first refractive interface 1111 in the horizontal direction, and after being reflected by the first position 140 and the second position 150, it can be vertically emitted from the first refractive interface 1111 at different positions in the vertical direction.

[0057] Based on this, the reflective interface 112 only needs to ensure that the first reflection angle A1 and the second reflection angle A2 formed at each point satisfy the first reflection angle A1 + the second reflection angle A2 = 90°, so as to achieve the aforementioned change in the propagation direction and the incident and exit positions of the light beam 200 to be compensated in the compensation element. For example, the compensation element can be implemented based on a fluid or semi-fluid light-transmitting medium, in which case the reflective interface can be a deformable mirror, and the deformable mirror can be controlled based on the aforementioned reflection angle requirement, so as to realize the dispersion compensation device 100 provided in the present application.

[0058] In some embodiments, the compensation element can be constructed based on a solid optical element (such as glass). At this time, in order to meet the aforementioned requirements for the reflection angle. The reflective interface 112 may include a first reflective interface 1121 and a second reflective interface 1122 that are relatively arranged. Among them, the corresponding positions in the first reflective interface 1121 and the second reflective interface 1122 are perpendicular to each other. The corresponding position may refer to the reflection position of the light beam 200 to be compensated at another reflective interface (such as the second reflective interface 1122) when any point in a certain reflective interface (such as the first reflective interface 1121) is used as a reflection position of the light beam 200 to be compensated in the reflective interface 112. Mutually perpendicular may refer to the normal planes (or tangent directions) at the corresponding positions being perpendicular to each other.

[0059] In some embodiments, to construct a compensation element, a first reflection interface may be randomly generated, and then the corresponding position function and the corresponding normal function of each point on the first reflection interface may be estimated, and the second reflection interface may be fitted based on the corresponding position function and the normal function.

[0060] In some embodiments, to simplify the compensation element, the first reflective interface 1121 and the second reflective interface 1122 may be linear, and the first reflective interface 1121 and the second reflective interface 1122 may be perpendicular to each other. For example, the angle between the first reflective interface 1121 and the vertical direction may be 30°, and the angle between the second reflective interface 1122 and the vertical direction should be 60°.

[0061] In some embodiments, considering the requirement of total reflection at the reflective interface, the first reflective interface 1121 and the second reflective interface 1122 may both be at an angle of 45° to the first direction. In this case, the reflective interface can achieve total reflection without a reflective coating.

[0062] It should be noted that Figure 3 The reflective interface shown is mainly for the light beam 200 to be compensated that enters from the first refractive interface 1111. In practical applications, the light beam 200 to be compensated can also enter or leave the compensation element based on other refractive interfaces. Figure 4 , Figure 5 and its related description.

[0063] Internal structure of an exemplary dispersion compensation device:

[0064] Figure 4 It is a schematic diagram of the structure of a dispersion compensation device provided by an exemplary embodiment of this specification. Figure 5 is a schematic diagram of the structure of another dispersion compensation device provided by an exemplary embodiment of this specification. Figure 4 may include structure 300A, Figure 5The structure 300B may be included. The structure 300A reflects another compensation element structure of the dispersion compensation device 100 and its matching relationship, and the structure 300B reflects an extended structure of the dispersion compensation device 100. Figure 4 and Figure 5 The presentation method and Figure 1 The same, no further elaboration is needed here.

[0065] Structure 300A shows a dispersion compensation device 100 based on compensation element 160 and compensation element 170. Compensation element 160 can be regarded as the first compensation element, and compensation element 170 can be regarded as the second compensation element. The arrangement relationship between compensation element 160 and compensation element 170 can be seen in Figure 1 The first compensation element and the second compensation element are shown.

[0066] As shown in structure 300A, a portion of the interface in the refractive interface in the compensation element 160 that is arranged along the second direction (i.e., the horizontal direction) between the first reflective interface 1621 and the first refractive interface 1611 forms a third refractive interface 1613, and a portion of the interface in the refractive interface in the compensation element 170 that is arranged along the second direction (horizontal direction) between the second reflective interface 1722 and the first refractive interface 1711 forms a second refractive interface 1712.

[0067] When the compensation element 160 serves as the aforementioned first compensation element, the light beam 200 to be compensated may vertically enter the compensation element from the third refractive interface 1613 of the first compensation element (ie, the compensation element 160 ).

[0068] When the compensation element 170 serves as the aforementioned second compensation element, the light beam 200 to be compensated is emitted vertically from the second refractive interface 1712 of the second compensation element (ie, the compensation element 170 ).

[0069] Based on the aforementioned second refractive interface and the third refractive interface, the light beam 200 to be compensated can be incident and emitted at a relatively stable position (ie, regional range).

[0070] Structure 300B shows a dispersion compensation device 100 including at least two groups of first compensation elements and second compensation elements, which is constructed based on the aforementioned compensation elements 160 and 170. The second refractive interface and the third refractive interface can be used as transmission interfaces of each compensation element in a vertical direction.

[0071] It should be noted that, based on the aforementioned second refractive interface and the third refractive interface, the dispersion compensation device can add optical elements according to actual needs to achieve corresponding functions. For example, a reflective element can be provided at the exit of the light beam to be compensated so that the exit position of the light beam to be compensated at the dispersion compensation device is constant.

[0072] Exemplary dispersion compensation methods:

[0073] In some embodiments, based on the above dispersion compensation device, the relative positions of the first compensation element and the second compensation element in the vertical direction can be adjusted to adjust the reflection rounds, thereby adjusting the dispersion compensation amount of the light beam to be compensated. Thus, the present application provides a dispersion compensation method.

[0074] Figure 6 It is an exemplary flow chart of a dispersion compensation method provided by an exemplary embodiment of this specification.

[0075] In some embodiments, Figure 6 The dispersion compensation method P400 shown can be performed based on a dispersion compensation device capable of adjusting the relative position of the first compensation element and the second compensation element in the vertical direction. Correspondingly, the dispersion compensation device can include a displacement stage. The displacement stage can be used to adjust the relative position of the first compensation element and the second compensation element to adjust the reflection rounds of at least two reflection rounds.

[0076] Based on the aforementioned dispersion compensation device including a translation stage, P400 may include the following steps:

[0077] S410: Adjust the relative positions of the first compensation element and the second compensation element based on a translation stage in the dispersion compensation device.

[0078] S420, curing the dispersion compensation device based on the relative position. Curing the dispersion compensation device can be understood as controlling the relative position of the first compensation element and the second compensation element in the dispersion compensation device to be the value determined in S410 and not to change.

[0079] In some embodiments, the above P400 can be implemented by gradually adjusting the translation stage, for example, by gradually reducing the relative distance from a larger relative distance through the translation stage until the beam to be compensated meets the preset requirements.

[0080] In some embodiments, the above P400 may also be determined based on preset dispersion parameters that need to be compensated.

[0081] like Figure 6 As shown, the aforementioned S410 may also include the following sub-steps:

[0082] S411, determining a dispersion parameter of the light beam to be compensated, wherein the dispersion parameter may be a dispersion parameter to be compensated of the light beam to be compensated.

[0083] S412, determining the reflection rounds of the light beam to be compensated in the dispersion compensation device according to the dispersion parameter of the light beam to be compensated, wherein the reflection rounds that can approximate the dispersion parameter can be determined by simulating the optical path / the aforementioned step-by-step adjustment through computer software.

[0084] S413. Determine a target relative position of a compensation element in the dispersion compensation device based on the reflection rounds.

[0085] S414: Send the target relative position to the translation stage so that the translation stage adjusts the relative position.

[0086] In some embodiments, considering that the dispersion compensation method provided by the present application controls the dispersion compensation amount by controlling the reflection rounds, and its compensation for dispersion is step-wise, the dispersion compensation device provided by the present application can compensate for most of the dispersion parameters, and a conventional compensation device (such as compensation glass) is provided outside the dispersion compensation device to compensate for the remaining dispersion parameters, so as to improve the compensation accuracy.

[0087] Example compensation element internal structure:

[0088] Figure 7 It is a schematic diagram of the internal structure of a compensation element provided by an exemplary embodiment of this specification. Figure 7 It can be presented as another arrangement mode of compensation elements in the dispersion compensation device, such as Figure 7 As shown, in the dispersion compensation device, compensation for the light beam to be compensated is achieved based on a compensation element 180.

[0089] It should be noted that Figure 7 The dispersion compensation element shown can be understood as Figure 4 The dispersion compensation element shown is a morphology in which two compensation elements are combined into one element. Figure 4 The two first refraction interfaces in merge into Figure 7 The dotted line in .

[0090] The compensation element 180 is disposed between two parallel interfaces, wherein the two parallel interfaces are disposed in parallel and have a staggered area. Figure 1 and Figure 2 The compensation elements in the provided dispersion compensation device are different, and the light beam to be compensated completes the entire reflection process in a single compensation element 180 without passing through other compensation elements.

[0091] Specifically, the compensation element 180 may include two reflection interface groups for reflecting the light beam to be compensated in the compensation element. The two reflection interface groups are arranged opposite to each other so that when the compensation light beam is emitted from one reflection interface group, it can be emitted into the other reflection interface group in parallel.

[0092] In some embodiments, two reflective interface groups are arranged based on staggered regions of two parallel interfaces, and the compensation light beam can be vertically injected into the compensation element 180 from the staggered region above the parallel interface, and vertically injected out of the compensation element 180 from the staggered region below the parallel interface. The staggered region may refer to a region in the parallel interface where the reflective interface groups do not intersect.

[0093] The structure of the two reflection interface groups Figure 1 The first compensation element in is similar to the second compensation element, and is different from the first compensation element and the second compensation element in that the reflection interface group includes a first reflection interface 181 and a second reflection interface 182, that is, the first reflection interface and the second reflection interface constitute one of the two reflection interface groups, and the two reflection interface groups have the same structure, but the reflection interface group does not include a refractive interface. The first reflection interface 181 can be set based on the staggered area of ​​the aforementioned parallel interface, so that the light beam to be compensated vertically incident on the staggered area is reflected at the first reflection interface 181, and the second reflection interface 182 is set between the first reflection interface 181 and the corresponding parallel interface.

[0094] Similar to the above 4, the top and bottom of the compensation element 180 can form a refractive interface 183, thereby realizing the incidence and emission of the light beam. The specific incidence and emission methods can be found in Figure 7 Related description.

[0095] In some embodiments, based on the compensation element 180, the reflection rounds of the compensation beam at the two reflection interface groups can be further adjusted by injecting the compensation beam into the position of the adjustment parallel interface to achieve multiple reflection rounds. Figure 8 As shown, the number of reflection rounds of the beam to be compensated 200 between the two reflection interface groups is 3. The principle and process of realizing multiple rounds of reflection based on two reflection interface groups are similar to Figure 1 The compensation components are consistent with those in Figure 1 The relevant description in will not be repeated here.

[0096] It should be noted that Figure 8 The number of reflection rounds of the light beam to be compensated in the compensation element shown in the figure is only an example. In practical applications, the number of reflection rounds of the light beam to be compensated in the compensation element is not specifically limited and can be adjusted according to actual needs. The number of reflection rounds can be 4 or more.

[0097] In some embodiments, considering the requirement of total reflection at the reflection interface, the first reflection interface 181 can be perpendicular to the second reflection interface 182, wherein the first reflection interface 181 and the second reflection interface 182 can be arranged in the following manner: the first reflection interface 181 is at an angle of 45° to the second direction, and the second reflection interface 182 is at an angle of 135° to the second direction; or the first reflection interface 181 is at an angle of 135° to the second direction, and the second reflection interface 182 is at an angle of 45° to the second direction.

[0098] Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0099] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0100] In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of units is only a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0101] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0102] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0103] If the function is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for a computer device (which can be a personal computer, server, or network device, etc.) to perform all or part of the steps of the various embodiments of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk, and other media that can store program check codes.

[0104] It should be noted that, in the description of this application, the terms "first", "second", "third", etc. are used for descriptive purposes only and cannot be understood as indicating or implying relative importance. In addition, in the description of this application, unless otherwise specified, the meaning of "plurality" is two or more.

[0105] The above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent substitutions, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A dispersion compensation device, characterized in that: The dispersion compensation device comprises at least a first compensation element and a second compensation element, each compensation element comprising a refractive interface and a reflective interface; The light beam to be compensated is vertically incident from the refractive interface of the first compensation element, vertically emitted from the refractive interface of the second compensation element, propagates between the compensation elements in a propagation form of normal incidence / normal emission based on the refractive interface, and changes the propagation direction and the incident and emission position of the light beam to be compensated in the compensation element based on the reflective interface, so that the light beam to be compensated is emitted from the at least two compensation elements after at least two rounds of reflection between the first compensation element and the second compensation element; The first compensation element and the second compensation element are arranged relative to each other based on a first refractive interface and are staggered in a first direction. The light beam to be compensated propagates between the first compensation element and the second compensation element based on the overlapping part of the first refractive interface, and the incident and exit positions in the overlapping part are changed by the reflective interface to realize at least two rounds of reflection.

2. The dispersion compensation device according to claim 1, characterized in that: The reflection interface includes a first reflection interface and a second reflection interface which are arranged opposite to each other, and the first reflection interface and the second reflection interface are perpendicular to each other.

3. The dispersion compensation device according to claim 2, characterized in that: The first reflection interface and the second reflection interface both form an angle of 45° with the first direction.

4. The dispersion compensation device according to claim 3, characterized in that: A portion of the refractive interface disposed along a second direction between the second reflective interface and the first refractive interface forms a second refractive interface; the light beam to be compensated is emitted vertically from the second refractive interface of the second compensation element out of the compensation element; and / or A portion of the refractive interface arranged along the second direction between the first reflective interface and the first refractive interface forms a third refractive interface; the light beam to be compensated is vertically incident on the compensation element from the third refractive interface of the first compensation element.

5. The dispersion compensation device according to claim 1, characterized in that: The light beam to be compensated is emitted vertically from the second compensation element from the staggered part of the first refractive interface; and / or The light beam to be compensated is vertically incident on the first compensation element from the staggered portion of the first refractive interface.

6. The dispersion compensation device according to claim 1, characterized in that: The dispersion compensation device also includes: The translation stage is used to adjust the relative positions of the first compensation element and the second compensation element to adjust the reflection rounds of the at least two rounds of reflection.

7. A dispersion compensation method, characterized in that: Applied to the dispersion compensation device of claim 6, the method comprising: adjusting the relative positions of the first compensation element and the second compensation element based on the displacement stage in the dispersion compensation device; The dispersion compensation device is solidified based on the relative position.

8. The dispersion compensation method according to claim 7, characterized in that: The adjusting the relative positions of at least two compensation elements based on the translation stage in the dispersion compensation device comprises: determining a dispersion parameter of a light beam to be compensated; Determining the reflection rounds of the light beam to be compensated in the dispersion compensation device according to the dispersion parameter of the light beam to be compensated; determining a target relative position of a compensating element in the dispersion compensation device based on the reflection rounds; The target relative position is sent to the translation stage so that the translation stage adjusts the relative position.

9. A compensation element, characterized in that: The compensation element comprises: Two parallel interfaces, wherein the two parallel interfaces are arranged in parallel and have a staggered area in the second direction; Two reflective interface groups, wherein the reflective interface groups correspond to the parallel interfaces and are arranged based on the staggered regions of the corresponding parallel interfaces, for reflecting light beams incident in parallel on the reflective interface groups or light beams incident vertically from the staggered regions, so that the light beams are emitted in parallel from different positions of the reflective interface groups; the two reflective interface groups are arranged relative to each other, so that the light beams emitted in parallel from one reflective interface group are emitted in parallel to the other reflective interface group; Among them, the light beam to be compensated is vertically incident from the staggered area of ​​the parallel interface, and propagates between the two reflective interface groups of the compensation element in the propagation form of normal incidence / normal exit based on the reflective interface group, and the propagation direction and incident and exit positions of the light beam to be compensated in the compensation element are changed based on the reflective interface group, so that the light beam to be compensated is vertically emitted from the staggered area after at least two rounds of reflection in the compensation element.

10. The compensation element according to claim 9, characterized in that The reflection interface group includes a first reflection interface and a second reflection interface; Among them, the first reflection interface is set based on the staggered area of ​​the corresponding parallel interface, so that the light beam vertically incident on the staggered area is reflected at the first reflection interface, and the second reflection interface is set between the first reflection interface and the corresponding parallel interface. The first reflection interface and the second reflection interface are perpendicular to each other and form an angle of 45° or 135° with the second direction.

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