Dispersion compensation device and dispersion compensation method

Abstract

Disclosed in the present application are a dispersion compensation device and a dispersion compensation method. The dispersion compensation device at least comprises a first compensation element and a second compensation element, wherein each compensation element comprises a refractive interface and a reflective interface. A light beam to be subjected to compensation propagates between the compensation elements in a normal-incidence / normal-exit propagation mode on the basis of the refractive interfaces, and the propagation direction and incidence and exit positions of said light beam within the compensation elements are changed on the basis of the reflective interfaces, such that said light beam exits from the at least two compensation elements after undergoing at least two rounds of reflection between the first compensation element and the second compensation element. In the dispersion compensation device provided in the present application, a normal-incidence / normal-exit mode is used such that a light beam to be subjected to compensation propagates between compensation elements without introducing dispersion, and multiple rounds of reflection are performed by means of a first compensation element and a second compensation element that are arranged opposite each other and staggered, thereby achieving a high degree of dispersion compensation on the basis of a relatively simple optical structure.

Description

A dispersion compensation device and a dispersion compensation method

[0001] This application claims priority to Chinese Patent Application No. 202510031956.6, filed with the State Intellectual Property Office of China on January 8, 2025, entitled “A Dispersion Compensation Device and Dispersion Compensation Method”, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of optical signal propagation, specifically to a dispersion compensation device and a dispersion compensation method. Background Technology

[0003] During the transmission of optical signals, dispersion may occur due to the influence of the transmission medium and the optical structure in the propagation path. Dispersion refers to the phenomenon that different wavelengths of light have different propagation speeds when propagating in a medium, resulting in the separation of the light spectrum.

[0004] Dispersion can significantly impact optical signal transmission, including but not limited to signal distortion, increased crosstalk, transmission distance limitations, and signal attenuation. Therefore, solving the dispersion problem during optical signal transmission is a technical issue that urgently needs to be addressed by those skilled in the art. Summary of the Invention

[0005] In view of this, the present application provides a dispersion compensation device and a dispersion compensation method, which can achieve dispersion compensation of the beam to be compensated by a compensation medium with the opposite dispersion characteristics to the beam to be compensated, thereby overcoming the shortcomings of the prior art.

[0006] In a first aspect, embodiments of this application provide a dispersion compensation device, which includes at least a first compensation element and a second compensation element. Each compensation element includes a refractive interface and a reflective interface. A beam of light to be compensated enters perpendicularly from the refractive interface of the first compensation element and exits perpendicularly from the refractive interface of the second compensation element. Based on the refractive interface, the beam propagates between the compensation elements in a normal-incident / normal-outcrow propagation manner. The reflective interface alters the propagation direction and incident / outcrow positions of the beam within the compensation elements, so that the beam undergoes at least two rounds of reflection between the first and second compensation elements before exiting from at least two compensation elements. The first and second compensation elements are arranged opposite each other based on the first refractive interface and staggered in a first direction. The beam of light to be compensated propagates between the first and second compensation elements based on the overlapping portion of the first refractive interface, and the reflective interface alters the incident / outcrow positions at the overlapping portion to achieve at least two rounds of reflection.

[0007] In some embodiments of this application, the reflective interface includes a first reflective interface and a second reflective interface disposed opposite to each other, with corresponding positions of the first reflective interface and the second reflective interface being perpendicular to each other.

[0008] In some embodiments of this application, both the first reflective interface and the second reflective interface are at a 45° angle to the first direction.

[0009] In some embodiments of this application, a portion of the interface disposed along the second direction between the second reflection interface and the first refractive interface forms a second refractive interface; the beam to be compensated exits the compensation element perpendicularly from the second refractive interface of the second compensation element; and / or a portion of the interface disposed along the second direction between the first reflection interface and the first refractive interface forms a third refractive interface; the beam to be compensated enters the compensation element perpendicularly from the third refractive interface of the first compensation element.

[0010] In some embodiments of this application, the beam to be compensated exits the second compensation element perpendicularly from the staggered portion of the first refractive interface; and / or the beam to be compensated enters the first compensation element perpendicularly from the staggered portion of the first refractive interface.

[0011] In some embodiments of this application, the dispersion compensation device further includes a displacement stage for adjusting the relative positions of the first compensation element and the second compensation element to adjust the reflection rounds of at least two rounds of reflection.

[0012] Secondly, embodiments of this application provide a dispersion compensation method applied to a dispersion compensation device according to certain embodiments of the first aspect. The dispersion compensation method includes: adjusting the relative positions of a first compensation element and a second compensation element based on a displacement stage in the dispersion compensation device; and solidifying the dispersion compensation device based on the relative positions.

[0013] In some embodiments of this application, adjusting the relative positions of at least two compensation elements based on a displacement stage in a dispersion compensation device includes: determining the dispersion parameters of the beam to be compensated; determining the reflection order of the beam in the dispersion compensation device based on the dispersion parameters; determining the target relative positions of the compensation elements in the dispersion compensation device based on the reflection order; and sending the target relative positions to the displacement stage to adjust the relative positions of the displacement stage.

[0014] Thirdly, embodiments of this application provide a compensation element, comprising: two parallel interfaces, wherein the two parallel interfaces are arranged in parallel and have a staggered region 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 region of the corresponding parallel interfaces, for reflecting a beam of light incident parallel to the reflective interface group or a beam of light incident perpendicularly from the staggered region, so that the beam of light exits parallel from different positions of the reflective interface group; the two reflective interface groups are arranged opposite to each other so that a beam of light exiting parallel from one reflective interface group enters the other reflective interface group in parallel; wherein the beam of light to be compensated enters perpendicularly from the staggered region of the parallel interfaces, propagates between the two reflective interface groups of the compensation element in a normal incident / normal exit propagation form based on the reflective interface groups, and changes the propagation direction and incident / exit position of the beam of light to be compensated in the compensation element based on the reflective interface groups, so that the beam of light to be compensated exits perpendicularly from the staggered region after at least two rounds of reflection in the compensation element.

[0015] In some embodiments of this application, the reflective interface group includes a first reflective interface and a second reflective interface; wherein, the first reflective interface is set based on a staggered region of a corresponding parallel interface, so that a beam of light perpendicularly incident on the staggered region is reflected by the first reflective interface, and the second reflective interface is set 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.

[0016] This application provides an adaptive optics-based dispersion compensation device and method. In the dispersion compensation device provided in this application, the beam to be compensated is made to propagate between compensation elements without generating dispersion by normal incident / normal exit. Multiple reflections are performed by the relatively staggered first compensation element and the second compensation element. A high degree of dispersion compensation is achieved based on a relatively simple optical structure. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 is a schematic diagram of the compensation principle of a dispersion compensation device provided in an exemplary embodiment of this application.

[0019] Figure 2 is a schematic diagram of the structure of a compensation element provided in an exemplary embodiment of this application.

[0020] Figure 3 is a schematic diagram of another compensation element provided in an exemplary embodiment of this application.

[0021] Figure 4 is a schematic diagram of the structure of a dispersion compensation device provided in an exemplary embodiment of this application.

[0022] Figure 5 is a schematic diagram of another dispersion compensation device provided in an exemplary embodiment of this application.

[0023] Figure 6 is an exemplary flowchart of a dispersion compensation method provided in an exemplary embodiment of this application.

[0024] Figure 7 is a schematic diagram of the structure of another compensation element provided in an exemplary embodiment of this application.

[0025] Figure 8 is a schematic diagram of the structure of another compensation element provided in an exemplary embodiment of this application.

[0026] Among them, 100 is a dispersion compensation device; 200 is a compensation beam; 110 is a first compensation element; 120 is a second compensation element; 111 is a refractive interface; 112 is a reflection interface; 130 is an overlapping portion; 1111 is a first refractive interface; 140 is a first position; 150 is a second position; 1121 is a first reflection interface; 1122 is a second reflection interface; 160 is a compensation element; 170 is a compensation element; 1621 is a first reflection interface; 1611 is a first refractive interface; 1613 is a third refractive interface; 1722 is a second reflection interface; 1711 is a first refractive interface; 1712 is a second refractive interface; 180 is a compensation element; 181 is a first reflection interface; 182 is a second reflection interface; and 183 is a refractive interface. Detailed Implementation

[0027] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0028] Application Overview:

[0029] During optical signal transmission, optical signal dispersion can generally be classified into normal dispersion and anomalous dispersion based on the distribution of wavelengths. In normal dispersion, longer wavelengths of light propagate faster through materials than shorter wavelengths. Anomalous dispersion exhibits the opposite phenomenon.

[0030] In practical 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 the propagation of a light beam often exhibits anomalous dispersion after collimation.

[0031] To compensate for anomalous dispersion, two techniques are generally employed. One is compensation based on materials with normal dispersion, and the other is to separate the beam and compensate for different components one by one.

[0032] The above-mentioned compensation techniques have at least the following technical problems:

[0033] Compensation based on normal dispersive materials typically involves passing the signal to be compensated through the normal dispersive material and then compensating for anomalous dispersion based on the compensation path of the signal within the material. However, the compensation capability of normal dispersive materials is limited; when the degree of dispersion is significant, it is difficult to construct a sufficiently long compensation path.

[0034] The method of compensating each component separately requires relatively complex compensation equipment, and the compensation capacity is also limited.

[0035] To address the dispersion compensation problem (especially anomalous dispersion compensation), this application provides a dispersion compensation device. In the dispersion compensation device provided in this application, the beam to be compensated propagates between compensation elements without dispersion through a normal incident / normal exit method, and multiple reflections are performed through relatively staggered first and second compensation elements. A high degree of dispersion compensation is achieved based on a relatively simple optical structure. Various non-limiting embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0036] Exemplary dispersion compensation device:

[0037] To further describe the dispersion compensation device provided in this application, this application provides a schematic diagram of the compensation principle of the dispersion compensation device (Figure 1) and a schematic diagram of the structure of a single compensation element (Figure 2). The dispersion compensation device provided in this application will be described below with reference to Figures 1 and 2.

[0038] Figure 1 is a schematic diagram of the compensation principle of a dispersion compensation device provided in an exemplary embodiment of this application. Figure 1 can be presented as a cross-sectional view of the dispersion compensation device 100 on the propagation plane of the beam 200 to be compensated. That is, the propagation direction of the beam 200 to be compensated can be the direction of the plane of Figure 1 (such as the x-axis direction, y-axis direction).

[0039] In some embodiments, the x-axis direction (also referred to as the horizontal direction) in FIG1 can be the propagation direction of the beam 200 to be compensated during multiple reflections within the dispersion compensation device 100, and the y-axis direction (also referred to as the vertical direction) is the direction perpendicular to the horizontal direction in the plane shown in FIG1. ​​That is, the dispersion compensation device 100 in FIG1 is set up with the propagation direction of the beam 200 to be compensated known, and the horizontal and vertical directions are determined according to the propagation direction of the beam 200 to be compensated, thereby determining the method of setting up the internal structure.

[0040] It should be noted that the dispersion compensation device provided in this application only needs to meet the relevant technical requirements of this application on the propagation plane of the beam to be compensated. Those skilled in the art can adapt the actual structure of the dispersion compensation device accordingly. For example, those skilled in the art can set each component in the dispersion compensation device as a columnar body, and make the extension direction of the columnar body perpendicular to the propagation plane of the beam to be compensated, so that the dispersion compensation device only needs to meet the technical requirements of this application on the propagation plane of the beam to be compensated.

[0041] As shown in Figure 1, the dispersion compensation device 100 can perform at least two rounds of reflection on the beam 200 to be compensated, thereby achieving compensation for the beam 200. The dispersion coefficient of the optical element through which the beam 200 passes is opposite to that of the beam. That is, for a beam containing anomalous dispersion, the elements in the dispersion compensation device 100 can be normal dispersion elements.

[0042] Specifically, during compensation, the beam 200 to be compensated enters from the first compensation element 110 and exits from the second compensation element 120. Between the first compensation element 110 and the second compensation element 120, the beam 200 propagates back and forth between them, undergoing at least two rounds of reflection. The number of reflection rounds (i.e., how many rounds of reflection the beam 200 undergoes) between the first compensation element 110 and the second compensation element 120 is related to the number of times the beam 200 returns from the second compensation element 120 to the first compensation element 110. Specifically, the number of reflection rounds can be the number of returns + 1.

[0043] For example, when the beam to be compensated 200 travels 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 during this process is 0, and the number of reflection rounds is 1. When the beam to be compensated 200 travels from the first compensation element 110 to the second compensation element 120 and back to the first compensation element 110 and then back to the second compensation element 120, the number of returns during this process is 1, and the number of reflection rounds is 2. Specifically, the number of reflection rounds shown in Figure 1 is 2.

[0044] The first compensation element 110 and the second compensation element 120 are the 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 beam 200 to be compensated. Therefore, the dispersion compensation of the beam 200 to be compensated can be achieved through multiple reflections of the beam 200 to be compensated by the first compensation element 110 and the second compensation element 120.

[0045] To achieve the aforementioned multi-round 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 can be used to allow the beam to be compensated 200 to enter and exit within the first compensation element 110. The reflective interface 112 can adjust the refraction position of the beam to be compensated 200 at the refractive interface 111 through reflection of the beam to be compensated 200.

[0046] To avoid dispersion of the beam to be compensated 200 within the compensation element, the beam 200 can propagate between the compensation elements in a normal-incident / normal-outcryogenic propagation mode based on the refractive interface. Furthermore, the propagation direction and incident / outcryogenic positions of the beam 200 within the compensation element can be altered based on the reflection interface to achieve the aforementioned multi-round reflection. Normal-incident / normal-outcryogenic propagation does not produce dispersion.

[0047] In some embodiments, to achieve the aforementioned change in the incident and exit positions of the compensation beam 200, the compensation beam 200 undergoes two reflections at the reflecting interface. Specifically, the two reflections of the compensation beam 200 at the reflecting interface may include a first reflection and a second reflection. Both the first and second reflections are total internal reflections, and the sum of the reflection angles of the first and second reflections is 90 degrees, to ensure that the light ray before the first reflection and the light ray after the second reflection are parallel and perpendicular to the refraction interface. For a detailed explanation of the implementation principle of the reflecting interface, please refer to Figure 2 and its related description.

[0048] Based on the aforementioned refractive and reflective interfaces, when the first compensation element 110 and the second compensation element 120 are arranged opposite each other based on the first refractive interface and intersect in the first direction (i.e., the vertical direction), the beam to be compensated 200 propagates between the first compensation element 110 and the second compensation element 120 based on the overlapping portion 130 of the first refractive interface. The incident and exit positions in the overlapping portion 130 are changed by the reflective interface to achieve at least two rounds of reflection. The portion of the refractive interface that faces the opposite refractive interface is called the first refractive interface, which is generally the portion of the refractive interface 111 in Figure 1 that extends in the vertical direction.

[0049] As shown in Figure 1, when the beam to be compensated 200 exits from the second compensation element 120 at the overlapping portion 130 of the first refractive interface during this round of reflection, the compensating beam 200 needs to undergo at least one more round of reflection. When the beam to be compensated 200 exits from the second compensation element 120 at the intersecting portion of the first refractive interface during this round of reflection, the compensating beam 200 can leave both the first compensation element 110 and the second compensation element 120, thus ending the multi-round reflection.

[0050] In some embodiments, for ease of setup, the first compensation element 110 and the second compensation element 120 are generally constructed using the same optical elements. That is, the first compensation element 110 and the second compensation element 120 are generally identical within the same tolerance range. It should be noted that this 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 different design parameters can also be selected for both according to actual needs.

[0051] Based on the aforementioned design, the dispersion compensation device provided in this application enables the beam to be compensated to propagate between compensation elements without dispersion by normal incident / normal exit. The beam is extended through multiple reflections by the relatively staggered first and second compensation elements, thereby achieving a high degree of dispersion compensation based on a relatively simple optical structure.

[0052] It should be noted that the distinction between refractive and reflective interfaces in this application is based on their relationship with the beam to be compensated. In practice, refractive and reflective interfaces can be the same or similar optical structures. For example, both refractive and reflective interfaces can serve as the edges of the compensation element. In some embodiments, to achieve the corresponding process, the optical structures containing the refractive and reflective interfaces can be processed. For example, a reflective coating can be applied to the edge of the reflective interface to achieve total internal reflection at various angles.

[0053] In some embodiments, based on the dispersion compensation device 100 shown in FIG1, the compensation beam 200 can exit the second compensation element 120 perpendicularly from the intersecting portion of the first refractive interface and enter the first compensation element 110 perpendicularly from the intersecting portion of the first refractive interface. The intersecting portion can refer to the portion of the first refractive interface between the first compensation element 110 and the second compensation element 120 that does not overlap in the horizontal direction.

[0054] In some embodiments, based on the above-described compensation device, the number of reflection rounds of the compensation beam 200 between the first compensation element 110 and the second compensation element 120 can be adjusted by adjusting the position of the compensation beam 200 entering the first compensation element 110, i.e., the position of the staggered portion of the first refractive interface, thereby achieving multiple rounds of reflection. As shown in Figure 2, the number of reflection rounds of the compensation beam 200 between the first compensation element 110 and the second compensation element 120 is 3.

[0055] Figure 3 is a schematic diagram of the structure of a compensation element provided in an exemplary embodiment of this application. Figure 3 uses a first compensation element as an example to illustrate the propagation of the beam to be compensated within the compensation element. The presentation of Figure 3 is consistent with that of Figure 1, and will not be repeated here.

[0056] As shown in Figure 3, the first compensation element 110 may include a refractive interface 111 and a reflective interface 112. Specifically, the refractive interface 111 may include a first refractive interface 1111.

[0057] When the beam to be compensated 200 enters the first compensation element 110 from the first refractive interface 1111, the beam to be compensated 200 undergoes a first reflection at the first position 140 of the reflective interface 112 and a second reflection at the second position 150. The angle between the beam to be compensated 200 and the normal at the first position 140 (the reflection angle of the beam to be compensated 200 at the first position 140) can be denoted as the first reflection angle A1, and the angle between the beam to be compensated 200 and the normal at the first position 140 can be denoted as the second reflection angle A2. Based on the foregoing, the first reflection angle A1 + the second reflection angle A2 = 90°. Combining the aforementioned properties of normals and tangents, it is easy to prove that the beam to be compensated 200 before the first reflection angle A1 is parallel to the beam after the second reflection angle A2. When the first refractive interface 1111 extends vertically, the beam to be compensated 200 can be incident vertically on the first refractive interface 1111 in the horizontal direction, and after reflection at the first position 140 and the second position 150, exit vertically from the first refractive interface 1111 at different positions in the vertical direction.

[0058] 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 condition that the first reflection angle A1 + the second reflection angle A2 = 90° to achieve the aforementioned change in the propagation direction and incident / exit position of the beam 200 to be compensated within the compensation element. For example, the compensation element can be based on a fluid or semi-fluid light-transmitting medium. In this case, the reflective interface can be a deformable mirror, and by controlling the deformable mirror based on the aforementioned reflection angle requirements, the dispersion compensation device 100 provided in this application can be realized.

[0059] In some embodiments, the compensation element can be constructed based on a solid-state optical element (such as glass). In this case, 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 disposed opposite to each other. Corresponding positions in the first reflective interface 1121 and the second reflective interface 1122 are perpendicular to each other. "Corresponding position" can refer to the reflection position of the beam 200 to be compensated at the other reflective interface (such as the second reflective interface 1122) when any point in one reflective interface (such as the first reflective interface 1121) is used as a reflection position of the beam 200 to be compensated at one reflective interface 112. "Perpendicular to each other" can mean that the normal planes (or tangent directions) at the corresponding positions are perpendicular to each other.

[0060] In some embodiments, to construct a compensation element, a first reflective interface can be randomly generated, and the corresponding position function and corresponding normal function of each point on the first reflective interface can be estimated. The second reflective interface can then be fitted based on the corresponding position function and normal function.

[0061] In some embodiments, to simplify the compensation element, the first reflective interface 1121 and the second reflective interface 1122 can be linear, in which case the first reflective interface 1121 and the second reflective interface 1122 can be perpendicular to each other. For example, if the angle between the first reflective interface 1121 and the vertical direction can be 30°, then the angle between the second reflective interface 1122 and the vertical direction should be 60°.

[0062] In some embodiments, considering the total internal reflection requirement at the reflective interface, the first reflective interface 1121 and the second reflective interface 1122 may both form a 45° angle with the first direction. In this case, the reflective interface can achieve total internal reflection without a reflective coating.

[0063] It should be noted that the reflection interface shown in Figure 3 is mainly for the beam 200 to be compensated entering from the first refractive interface 1111. In practical applications, the beam 200 to be compensated can also enter or leave the compensation element based on other refractive interfaces. See Figures 4 and 5 and their related descriptions for details.

[0064] Internal structure of an exemplary dispersion compensation device:

[0065] Figure 4 is a schematic diagram of the structure of a dispersion compensation device provided in an exemplary embodiment of this application. Figure 5 is a schematic diagram of the structure of another dispersion compensation device provided in an exemplary embodiment of this application. Figure 4 may include structure 300A, and Figure 5 may include structure 300B. Structure 300A reflects another compensation element structure of the dispersion compensation device 100 and its mating relationship, while structure 300B reflects an extended structure of the dispersion compensation device 100. The presentation of Figures 4 and 5 is consistent with that of Figure 1, and will not be repeated here.

[0066] Structure 300A illustrates a dispersion compensation device 100 constructed based on compensation element 160 and compensation element 170. Compensation element 160 can be considered as the aforementioned first compensation element, and compensation element 170 can be considered as the aforementioned second compensation element. The arrangement relationship between compensation element 160 and compensation element 170 can be seen in the first and second compensation elements shown in Figure 1.

[0067] As shown in structure 300A, in the compensation element 160, a portion of the refractive interface between the first reflective interface 1621 and the first refractive interface 1611 along the second direction (i.e., the horizontal direction) forms a third refractive interface 1613, and in the compensation element 170, a portion of the refractive interface between the second reflective interface 1722 and the first refractive interface 1711 along the second direction (the horizontal direction) forms a second refractive interface 1712.

[0068] When the compensation element 160 is used as the aforementioned first compensation element, the beam 200 to be compensated can be perpendicularly injected into the compensation element from the third refractive interface 1613 of the first compensation element (i.e., compensation element 160).

[0069] When the compensation element 170 is used as the aforementioned second compensation element, the beam 200 to be compensated is emitted perpendicularly from the second refractive interface 1712 of the second compensation element (i.e., compensation element 170).

[0070] Based on the aforementioned second and third refractive interfaces, the beam to be compensated 200 can be incident and emitted at a relatively stable position (i.e., within a region).

[0071] Structure 300B illustrates a dispersion compensation device 100 comprising at least two sets of first and second compensation elements, constructed based on the aforementioned compensation elements 160 and 170. The second and third refractive interfaces can serve as transmission interfaces for each compensation element in the vertical direction.

[0072] It should be noted that, based on the aforementioned second and third refractive interfaces, the dispersion compensation device can be supplemented with optical elements according to actual needs to achieve the corresponding functions. For example, a reflective element can be placed at the exit point of the beam to be compensated to ensure that the exit position of the beam to be compensated in the dispersion compensation device remains constant.

[0073] Exemplary dispersion compensation method:

[0074] In some embodiments, based on the above-described dispersion compensation device, the relative positions of the first compensation element and the second compensation element in the vertical direction can be adjusted to change the reflection cycle, thereby adjusting the dispersion compensation amount of the beam to be compensated. Therefore, this application provides a dispersion compensation method.

[0075] Figure 6 is an exemplary flowchart of a dispersion compensation method provided in an exemplary embodiment of this application.

[0076] In some embodiments, the dispersion compensation method P400 shown in FIG6 can be executed based on a dispersion compensation device capable of adjusting the relative positions of the first compensation element and the second compensation element in the vertical direction. Correspondingly, the dispersion compensation device may include a displacement stage. The displacement stage can be used to adjust the relative positions of the first compensation element and the second compensation element to adjust the reflection rounds of at least two rounds of reflection.

[0077] Based on the aforementioned dispersion compensation device including a displacement stage, P400 may include the following steps:

[0078] S410, adjust the relative positions of the first compensation element and the second compensation element based on the displacement stage in the dispersion compensation device.

[0079] S420, Curing dispersion compensation device based on relative position. Here, curing 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 the value determined in S410 and no longer changing.

[0080] In some embodiments, the P400 described above can be achieved by gradually adjusting the displacement stage. For example, the relative distance can be gradually reduced from a large relative distance using the displacement stage until the beam to be compensated meets the preset requirements.

[0081] In some embodiments, the above-mentioned P400 can also be determined based on a preset dispersion parameter that needs to be compensated.

[0082] As shown in Figure 6, the aforementioned S410 may further include the following sub-steps:

[0083] S411. Determine the dispersion parameters of the beam to be compensated. The dispersion parameters can be the dispersion parameters of the beam to be compensated.

[0084] S412. Based on the dispersion parameters of the beam to be compensated, determine the number of reflection rounds of the beam in the dispersion compensation device. This can be achieved by simulating the optical path using computer software or by making the aforementioned step-by-step adjustments to determine the number of reflection rounds that approximates the dispersion parameters.

[0085] S413. Determine the target relative position of the compensation element in the dispersion compensation device based on the reflection wheel.

[0086] S414. Send the target's relative position to the displacement stage so that the displacement stage can adjust its relative position.

[0087] In some embodiments, considering that the dispersion compensation method provided in this application controls the amount of dispersion compensation by controlling the number of reflection wheels, its dispersion compensation is abrupt. Therefore, the dispersion compensation device provided in this application can compensate for most dispersion parameters, and a conventional compensation device (such as compensation glass) can be set up in addition to the dispersion compensation device to compensate for the remaining dispersion parameters, so as to improve the compensation accuracy.

[0088] Exemplary internal structure of compensation element:

[0089] Figure 7 is a schematic diagram of the internal structure of a compensation element provided in an exemplary embodiment of this application. Figure 7 can also be presented as another arrangement of a compensation element in a dispersion compensation device. As shown in Figure 7, in this dispersion compensation device, compensation of the beam to be compensated is achieved based on a compensation element 180.

[0090] It should be noted that the dispersion compensation element shown in Figure 7 can be understood as the form of the two compensation elements in the dispersion compensation element shown in Figure 4 combined into one element. That is, the two first refractive interfaces in Figure 4 are merged into the dashed line in Figure 7.

[0091] The compensation element 180 is disposed between two parallel interfaces, which are arranged in parallel and have offset regions. Unlike the compensation elements in the dispersion compensation devices provided in Figures 1 and 2, the beam to be compensated completes the entire reflection process within a single compensation element 180, without passing through other compensation elements.

[0092] Specifically, the compensation element 180 may include two sets of reflective interfaces for reflecting the beam to be compensated within the compensation element. The two sets of reflective interfaces are arranged opposite to each other so that when the compensation beam exits from one set of reflective interfaces, it can enter the other set of reflective interfaces in parallel.

[0093] In some embodiments, the two reflective interface groups are arranged based on the staggered regions of the two parallel interfaces. The compensation beam can be perpendicularly injected into the compensation element 180 from the staggered region above the parallel interfaces and perpendicularly exited from the compensation element 180 from the staggered region below the parallel interfaces. The staggered region can refer to the area in the parallel interfaces where the reflective interface groups do not intersect.

[0094] The structure of the two reflective interface groups is similar to that of the first and second compensation elements in Figure 1. However, unlike the first and second compensation elements, the reflective interface group includes a first reflective interface 181 and a second reflective interface 182. That is, the first and second reflective interfaces constitute one of the aforementioned two reflective interface groups. The two reflective interface groups have identical structures, but the reflective interface group does not include a refractive interface. The first reflective interface 181 can be set based on a staggered region of the aforementioned parallel interfaces, so that the beam of light to be compensated, perpendicularly incident on the staggered region, is reflected by the first reflective interface 181. The second reflective interface 182 is located between the first reflective interface 181 and the corresponding parallel interface.

[0095] Similar to 4 above, the top and bottom of the compensation element 180 can form a refractive interface 183 to realize the incident and exit of the light beam. The specific incident and exit methods can be found in the relevant description in Figure 7.

[0096] In some embodiments, based on the compensation element 180, the reflection rounds of the compensation beam in the two reflective interface groups can be further adjusted by adjusting the position of the beam to be compensated into the parallel interface, thereby achieving multi-round reflection. As shown in Figure 8, the reflection rounds of the beam to be compensated 200 between the two reflective interface groups are 3. The principle and process of achieving multi-round reflection based on the two reflective interface groups are consistent with the compensation element in Figure 1, and can be referred to the relevant description in Figure 1, which will not be repeated here.

[0097] It should be noted that the number of reflection rounds of the beam to be compensated in the compensation element shown in Figure 8 is only an example. In practical applications, the number of reflection rounds of the 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.

[0098] In some embodiments, considering the total internal reflection requirement at the reflective interface, the first reflective interface 181 may be perpendicular to the second reflective interface 182. The first reflective interface 181 and the second reflective interface 182 may be configured such that the first reflective interface 181 forms a 45° angle with the second direction and the second reflective interface 182 forms a 135° angle with the second direction; or the first reflective interface 181 forms a 135° angle with the second direction and the second reflective interface 182 forms a 45° angle with the second direction.

[0099] Those skilled in the art will recognize that the units and algorithm steps of the various examples 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 implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0100] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0101] In the several embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between apparatuses or units may be electrical, mechanical, or other forms.

[0102] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0103] In addition, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

[0104] If a function is implemented as 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 this application, in essence, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods of the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program verification codes, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0105] It should be noted that in the description of this application, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Furthermore, in the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0106] The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications or equivalent substitutions made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A dispersion compensation device, characterized in that, The dispersion compensation device includes at least a first compensation element and a second compensation element, and each compensation element includes a refractive interface and a reflective interface; The beam to be compensated enters perpendicularly from the refractive interface of the first compensation element and exits perpendicularly from the refractive interface of the second compensation element. Based on the refractive interface, it propagates between the compensation elements in a normal-incident / normal-outcrystal propagation form. Based on the reflection interface, the propagation direction and incident / outcrystal position of the beam to be compensated in the compensation element are changed so that the beam to be compensated is reflected at least twice between the first compensation element and the second compensation element and then exits from the at least two compensation elements. The first compensation element and the second compensation element are arranged opposite each other based on the first refractive interface and are staggered in the first direction. The 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 of the overlapping part are changed by the reflection interface to achieve the at least two rounds of reflection.

2. The dispersion compensation device according to claim 1, characterized in that, The reflective interface includes a first reflective interface and a second reflective interface that are positioned opposite each other, with the first reflective interface and the second reflective interface being perpendicular to each other.

3. The dispersion compensation device according to claim 2, characterized in that, Both the first reflective interface and the second reflective interface are at a 45° angle to the first direction.

4. The dispersion compensation device according to claim 3, characterized in that, The portion of the refractive interface disposed along the second direction between the second reflective interface and the first refractive interface forms the second refractive interface; the beam to be compensated exits the compensation element perpendicularly from the second refractive interface of the second compensation element. and / or The portion of the refractive interface disposed along the second direction between the first reflective interface and the first refractive interface forms a third refractive interface; the beam to be compensated enters the compensation element perpendicularly from the third refractive interface of the first compensation element.

5. The dispersion compensation device according to claim 1, characterized in that, The beam to be compensated exits perpendicularly from the intersecting portion of the first refractive interface from the second compensation element; and / or The beam to be compensated enters the first compensation element perpendicularly from the intersecting portion of the first refractive interface.

6. The dispersion compensation device according to claim 1, characterized in that, The dispersion compensation device also includes: A displacement 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 reflection rounds.

7. A dispersion compensation method, characterized in that, The dispersion compensation method, applied to the dispersion compensation device of claim 6, comprises: The relative positions of the first compensation element and the second compensation element are adjusted 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, Adjusting the relative positions of the at least two compensation elements based on the displacement stage in the dispersion compensation device includes: Determine the dispersion parameters of the beam to be compensated; Based on the dispersion parameters of the beam to be compensated, determine the reflection round of the beam to be compensated in the dispersion compensation device; The target relative position of the compensation element in the dispersion compensation device is determined based on the reflection cycle. The target relative position is sent to the displacement stage so that the displacement stage adjusts the relative position.

9. A compensation element, characterized in that, The compensation element 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 are provided, wherein the reflective interface groups correspond to the parallel interface and are set based on the staggered area of ​​the corresponding parallel interface, for reflecting light beams incident parallel to the reflective interface groups or light beams incident perpendicularly from the staggered area, so that the light beams are emitted parallel from different positions of the reflective interface groups; the two reflective interface groups are arranged opposite to each other so that light beams emitted parallel from one reflective interface group are emitted parallel into the other reflective interface group. The beam to be compensated is perpendicularly incident from the offset region of the parallel interface, propagates between the two reflective interface groups of the compensation element in a normal incident / normal exit propagation form based on the reflective interface group, and changes the propagation direction and incident / exit position of the beam to be compensated in the compensation element based on the reflective interface group, so that the beam to be compensated is perpendicularly exited from the offset region after being reflected by the compensation element at least twice.

10. The compensation element according to claim 9, characterized in that, The reflective interface group includes a first reflective interface and a second reflective interface; The first reflective interface is set based on a staggered area of ​​the corresponding parallel interface so that the light beam perpendicularly incident on the staggered area is reflected at the first reflective interface. The second reflective interface is set 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.

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