Electro-optic phase modulator and system

Abstract

The invention provides an electro-optic phase modulator and system. Specifically, the electro-optic phase modulator comprises incident resonant cavities and an electro-optic crystal, and the incident resonant cavities are symmetrically arranged based on a vertical plane of a light path of the electro-optic crystal; a feed-in connector is arranged on a first wall plate, far away from the emergent resonant cavity, of the incident resonant cavity, is located on the vertical plane and is used for transmitting a radio frequency signal; in addition, at least part of the frequency modulation assembly is located in the incident resonant cavity and is arranged on the vertical plane or symmetrically arranged relative to the vertical plane. According to the technical scheme, light waves can be symmetrically modulated at the same intensity no matter the light waves enter from the front face or the back face of the electro-optical crystal, the problem that application of asymmetric design in the light path transmitting and receiving links is limited is solved, the application range of the modulator is widened, and the application range of the modulator is widened. The method is especially suitable for modulation processing of bidirectional optical signals in an optical communication system and an optical sensing system.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of electro-optical modulation, and in particular to an electro-optical phase modulator and system. BACKGROUND

[0002] High-frequency phase modulation belongs to a kind of electro-optical modulation technology, and its core function is to apply high-frequency phase modulation to laser phase based on electro-optical effect, and then realize the spectral broadening of narrow-band laser, to meet the special application requirements of accurately controlling laser coherence. At present, the electro-optical phase modulator has many deficiencies, for example, when applied to the link that needs optical path transmission and reception at the same time, the modulation effect of the light wave from different directions is different, which does not have reciprocity, cannot realize symmetrical equal intensity modulation, and limits its application range. SUMMARY

[0003] Therefore, the purpose of the present disclosure is to provide an electro-optical phase modulator and system.

[0004] To achieve the above purpose, the present disclosure provides an electro-optical phase modulator, comprising: an incident resonant cavity comprising a first through-hole; an exit resonant cavity comprising a second through-hole; an electro-optical crystal comprising a first surface electrode and a second surface electrode arranged oppositely; wherein, the first surface electrode faces the first through-hole, so that the radio frequency signal modulated by the incident resonant cavity enters the electro-optical crystal through the first through-hole; the second surface electrode faces the second through-hole, so that the radio frequency signal passing through the electro-optical crystal enters the exit resonant cavity through the second through-hole; the optical path of the electro-optical crystal is parallel to the first surface electrode; the incident resonant cavity is arranged symmetrically based on the vertical plane of the optical path; a feed-in joint arranged on the first wall plate of the incident resonant cavity away from the exit resonant cavity and located on the vertical plane, for emitting the radio frequency signal; and a frequency modulation component at least partially located in the incident resonant cavity and arranged on the vertical plane or symmetrically arranged with respect to the vertical plane.

[0005] In some embodiments, a fixing component is further included; the fixing component and the incident resonant cavity cooperate to fix the frequency modulation component.

[0006] In some embodiments, the frequency modulation component comprises a first micrometer and a second micrometer; wherein, the first micrometer and the second micrometer are both arranged on the vertical plane; or the first micrometer and the second micrometer are symmetrically arranged with respect to the vertical plane.

[0007] In some embodiments, the first micrometer comprises a first probe, and the second micrometer comprises a second probe; wherein, The first probe and the second probe are at least partially located in the incident resonant cavity.

[0008] In some embodiments, the first micrometer further comprises a first adjusting nut, and the second micrometer further comprises a second adjusting nut; wherein, the first adjusting nut is used to adjust the length of the first probe entering the incident resonant cavity; and the second adjusting nut is used to adjust the length of the second probe entering the incident resonant cavity.

[0009] In some embodiments, the frequency adjusting assembly further comprises a motor and a microprocessor; wherein, the microprocessor is connected to the motor, and is used to control the motor to drive at least one of the first adjusting nut and the second adjusting nut to rotate.

[0010] In some embodiments, the microprocessor is configured to: acquire and query a preset relational database according to a target resonant frequency, to determine a scale and a dielectric material corresponding to the target resonant frequency; in response to determining that the dielectric materials of the first probe and the second probe meet the requirements of the target resonant frequency, drive at least one of the first adjusting nut and the second adjusting nut by using the motor, until the scales of the first micrometer and the second micrometer meet the requirements of the target resonant frequency.

[0011] In some embodiments, further comprising a first pressing plate and a second pressing plate; wherein, The first pressing plate and the second pressing plate press the optoelectronic crystal, and the first pressing plate is connected to the side wall of the incident resonant cavity and the exit resonant cavity, and the second pressing plate is connected to the side wall of the incident resonant cavity and the exit resonant cavity.

[0012] In some embodiments, further comprising a temperature control assembly, which is used to adjust the working temperature of the electro-optical phase modulator (for example, an electro-optical crystal).

[0013] Based on the same inventive concept, the embodiments of the present disclosure further provide an electro-optical phase modulation system, comprising the electro-optical phase modulator according to any one of the preceding embodiments.

[0014] It can be seen from the above that the disclosure provides an electro-optical phase modulator and system. Specifically, the electro-optical phase modulator comprises an incident resonant cavity and an electro-optical crystal, the incident resonant cavity is symmetrically arranged based on a vertical plane of an optical path of the electro-optical crystal; a feed-in joint is arranged on a first wall plate of the incident resonant cavity away from the exit resonant cavity and located on the vertical plane, for emitting a radio frequency signal; in addition, at least part of a frequency modulation component is located in the incident resonant cavity and is arranged on the vertical plane or symmetrically arranged relative to the vertical plane. Such a technical solution enables symmetrical and equivalent intensity modulation of light waves regardless of whether they are emitted from the front or back of the electro-optical crystal, solves the problem of limited application of asymmetric design in the light path emission and reception link, expands the application range of the modulator, and is particularly suitable for bidirectional optical signal modulation processing in optical communication systems and optical sensing systems. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the disclosure or the related art, the drawings needed to be used in the embodiments or the related art description will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the disclosure, and other drawings can be obtained by those skilled in the art without creative labor.

[0016] Figure 1 A structural schematic diagram of an electro-optical phase modulation system provided by an embodiment of the disclosure is shown; Figure 2 A structural schematic diagram of an electro-optical phase modulator provided by an embodiment of the disclosure is shown; Figure 3 A structural schematic diagram of an electro-optical crystal provided by an embodiment of the disclosure is shown; Figure 4A A structural schematic diagram of a wall plate of an incident resonant cavity provided by an embodiment of the disclosure is shown; Figure 4B A structural schematic diagram of a wall plate of an incident resonant cavity provided by another embodiment of the disclosure is shown; Figure 4C A structural schematic diagram of a wall plate of an incident resonant cavity provided by another embodiment of the disclosure is shown; Figure 4D A structural schematic diagram of a wall plate of an incident resonant cavity provided by another embodiment of the disclosure is shown; Figure 5 A structural schematic diagram of a first pressing sheet provided by an embodiment of the disclosure is shown. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical solutions and advantages of the disclosure more clear, the disclosure will be further described in detail below in combination with specific embodiments and with reference to the drawings.

[0018] It should be noted that, unless otherwise defined, technical terms or scientific terms used in the embodiments of the present disclosure shall have the common meaning understood by one of ordinary skill in the art to which the present disclosure pertains. The terms "first", "second", and similar terms used in the embodiments of the present disclosure do not denote any order, quantity, or importance, but are merely used to distinguish different components. The terms "include", "contain", and similar terms mean that the elements or objects before the terms encompass the elements or objects listed after the terms and their equivalents, without excluding other elements or objects. The terms "connect" or "connected" and similar terms do not mean only physical or mechanical connections, but can include electrical connections, whether direct or indirect. The terms "upper", "lower", "left", "right", and the like are merely used to indicate relative positional relationships, and when the absolute positions of the described objects change, the relative positional relationships can also change accordingly.

[0019] As described in the background section, the electro-optical phase modulator has many deficiencies, for example, when applied to a link that requires simultaneous optical path transmission and reception, the modulation effects of the light waves from different directions are different, which lacks reciprocity and cannot achieve symmetric and equal intensity modulation, limiting the application range.

[0020] Therefore, the embodiments of the present disclosure provide an electro-optical phase modulator and system. Specifically, the electro-optical phase modulator includes an incident resonant cavity and an electro-optical crystal, the incident resonant cavity is symmetrically arranged based on a vertical plane of an optical path of the electro-optical crystal; a feed-in joint is arranged on a first wall plate of the incident resonant cavity away from the exit resonant cavity and located on the vertical plane, for transmitting a radio frequency signal; in addition, at least part of a frequency modulation component is located in the incident resonant cavity and is arranged on the vertical plane or symmetrically arranged with respect to the vertical plane. Such a technical solution enables symmetric and equal intensity modulation of light waves regardless of whether they enter from the front or back of the electro-optical crystal, solves the problem of limited application of asymmetric design in the optical path transmission and reception link, expands the application range of the modulator, and is particularly suitable for modulation processing of bidirectional optical signals in optical communication systems and optical sensing systems.

[0021] Figure 1 A structural schematic diagram of an electro-optical phase modulation system provided by an embodiment of the present disclosure is shown. As shown in Figure 1 The electro-optical phase modulation system 100 includes an electro-optical phase modulator 101, a driving source 102, and an analysis unit 103. In some embodiments, the driving source 102 includes a signal source, a power amplifier, etc. In some embodiments, the analysis unit 103 includes an optical path component, a photodetector, etc. The present disclosure does not make a detailed description of this.

[0022] In some embodiments, the structure of the electro-optical phase modulator 101 can be as shown in Figure 2As shown. Figure 2 As shown, the electro-optic phase modulator 200 specifically includes an incident resonant cavity 201, an output resonant cavity 202, an electro-optic crystal 203, a feed connector 204, and frequency modulation components 2051 and 2052.

[0023] Optionally, the electro-optic phase modulator 200 further includes a resonant base 207, on which the incident resonant cavity 201 and the output resonant cavity 202 are disposed.

[0024] Furthermore, the incident resonant cavity 201 includes a first through-hole 2012. The output resonant cavity 202 includes a second through-hole 2021.

[0025] Figure 3 A schematic diagram of the structure of an electro-optic crystal 300 provided in an embodiment of this disclosure is shown. Figure 3 As shown, in some embodiments, the electro-optic crystal 300 includes a first surface electrode 301 and a second surface electrode 302 disposed opposite to each other. Optionally, the electro-optic crystal 300 may be a lithium niobate crystal, a lithium tantalate crystal, a KTP crystal, or an RTP crystal. Optionally, the first surface electrode 301 and the second surface electrode 302 include a gold-plated layer.

[0026] Back Figure 2 The first surface electrode 301 faces the first through hole 2012 so that the radio frequency signal modulated by the incident resonant cavity 201 enters the electro-optic crystal 300 through the first through hole 2012; the second surface electrode 302 faces the second through hole so that the radio frequency signal passing through the electro-optic crystal 300 enters the output resonant cavity 202 through the second through hole 2021.

[0027] Combination Figure 2 and Figure 3 The optical path of the electro-optic crystal 300 l Parallel to the first surface electrode 301; the incident resonant cavity 201 is based on the optical path. l vertical plane ( xz The plane is symmetrically arranged. For example, the incident resonant cavity 201 is in... xy The cross-section of the plane can be referenced. Figure 4A through Figure 4D As shown.

[0028] Regarding the mounting of the electro-optic crystal 300, this disclosure also provides a mounting method. In some embodiments, the electro-optic phase modulator 200 further includes a first pressing plate 2081 and a second pressing plate 2082; wherein the first pressing plate 2081 and the second pressing plate 2082 press the photoelectric crystal 203, and the first pressing plate 2081 is connected to the sidewalls of the incident resonant cavity 201 and the exit resonant cavity 202, and the second pressing plate 2082 is connected to the sidewalls of the incident resonant cavity 201 and the exit resonant cavity 202. Optionally, the first pressing plate 2081 and the second pressing plate 2082 are made of metal to facilitate heat conduction.

[0029] Figure 5 A structure diagram of the first pressing plate 500 is shown. As shown, the first pressing plate 500 includes an exit fixed hole 501 and an entrance fixed hole 502. The first pressing plate 500 is connected to the side wall of the exit resonant cavity 202 through the exit fixed hole 501 by means of a countersunk screw, and is connected to the side wall (for example, the second wall plate opposite to the first wall plate 2011) of the entrance resonant cavity 201 through the entrance fixed hole 502. It should be understood that the second pressing plate 2082 is similar to the first pressing plate 2081, and will not be described in detail. Figure 5

[0030] In some embodiments, a temperature control assembly is further included for controlling the temperature of the electro-optic crystal 300. The temperature of the electro-optic crystal 300 can be regulated by means of the temperature control assembly, so as to reduce the temperature fluctuation of the electro-optic crystal 300 and the entrance resonant cavity 201, and improve the stability of the resonant frequency.

[0031] Exemplarily, the temperature control assembly can include a temperature probe 2091, a heat conductor 2092, a refrigeration sheet 2093 and a heat dissipation sheet 2094. Here, the heat conductor 2092 can be a heat-conductive silicone grease.

[0032] It should be noted that the temperature probe 2091 is attached to the first pressing plate 2081 or the second pressing plate 2082, so as to obtain the accurate temperature of the electro-optic crystal 300. The heat conductor 2092 fills the gap between the entrance resonant cavity 201 and the exit resonant cavity 202 and at least partially contacts the refrigeration sheet 2093, so as to adjust the temperature of the entrance resonant cavity 201 and the electro-optic crystal 300. The refrigeration sheet 2093 cools or heats based on the temperature information obtained by the temperature probe 2091, so as to accurately control the working temperature of the modulator and avoid the influence of temperature change on the performance of the electro-optic modulator. The heat dissipation sheet 2094 contacts the refrigeration sheet 2093, so as to achieve heat dissipation. It should be understood that the temperature probe 2091 and the refrigeration sheet 2093 can be connected to a microprocessor, so as to realize automatic control of the temperature, which will not be described in detail in the present disclosure. Here, the refrigeration sheet 2093 can be a semiconductor refrigeration sheet.

[0033] The feed-in joint 204 is arranged on the first wall plate 2011 of the entrance resonant cavity 201 away from the exit resonant cavity 202 and located on a vertical plane (the xz plane), and is used for emitting a radio frequency signal. It should be noted that the feed-in joint 204 can be connected to the driving source 102, which will not be described in detail in the present disclosure.

[0034] ​In some embodiments, the electro-optic phase modulator 200 may further include a lead-out connector 210. Here, the lead-out connector 210 may be disposed on the surface of the output resonant cavity 202 away from the incident resonant cavity 201, for dissipating the radio frequency signal of the output resonant cavity 202. It should be noted that in some alternative embodiments, the output resonant cavity 202 may be grounded, thereby omitting the lead-out connector 210.

[0035] Frequency modulation components 2051 and 2052 are at least partially located in the incident resonant cavity 201 and are disposed in a vertical plane (e.g., xz On a plane or relative to a vertical plane (e.g.) xz (Plane) Symmetrical arrangement.

[0036] It should be understood that, theoretically, the optical path... l While countless perpendicular planes exist, the perpendicular planes mentioned above in this disclosure refer to the same plane, namely, the plane of symmetry of the incident resonant cavity 201. In other words, the plane of symmetry of the incident resonant cavity 201 is perpendicular to the optical path. l .

[0037] With this setup, light waves from y Axis (corresponding optical path) l The light wave can be incident in either the positive or negative direction, and the incident resonant cavity 201 can modulate the light wave symmetrically with equal intensity. For applications that require both optical transmission and reception, the modulation deviation of the electro-optic modulator 200 can be reduced, thereby helping to eliminate the need for algorithm compensation for modulation deviation.

[0038] In some embodiments, the incident resonant cavity 201 can be a right prism, such as a right square prism (e.g., a cuboid), a right triangular prism, a right pentagonal prism, etc.

[0039] Here, the incident resonant cavity 201 can be made of aluminum. Optionally, the inner surface of the incident resonant cavity 201 may include a gold plating layer.

[0040] Optionally, the incident resonant cavity 201 may include a first wall plate 2011. Figure 4A through Figure 4D A schematic diagram of the structure of the first wall plate 400 of the incident resonant cavity provided in an embodiment of this disclosure is shown. Figure 4A through Figure 4D As shown, the first wall plate 400 can be rectangular or symmetrical trapezoidal. The first wall plate 400 includes a mounting hole 401 and a feed hole 403. The mounting hole 401 can be used to fix the first wall plate 400 to the top and bottom plates of the incident resonant cavity 201. The feed hole 403 can be used to install the feed connector 204.

[0041] In some embodiments, a fixing component 206 is further included; the fixing component 206 and the incident resonant cavity 201 cooperate to fix the frequency tuning components 2051 and 2052. Exemplarily, the fixing component 206 may be a fixing frame.

[0042] In view of the fact that the resonant frequency of the optoelectronic modulator in the related art is not accurate and flexible enough to meet the demand for specific frequency in different application scenarios, the embodiment of the present disclosure provides a frequency adjustment assembly 2051, 2052 which can accurately and flexibly adjust the resonant frequency.

[0043] In some embodiments, as shown in Figure 2 The frequency adjustment assembly 2051, 2052 includes a first micrometer 2051 and a second micrometer 2052. In order to ensure that the light wave enters from the positive direction or the negative direction of the y axis (corresponding to the optical path l ), the incident resonant cavity 201 can perform symmetric and equal-intensity modulation on the light wave. In some embodiments, the first micrometer 2051 and the second micrometer 2052 are both arranged on a vertical plane (for example, the xz plane). In some alternative embodiments, the first micrometer 2051 and the second micrometer 2052 are symmetrically arranged with respect to the vertical plane (for example, the xz plane).

[0044] In some embodiments, the first micrometer 2051 includes a first probe 20511, and the second micrometer 2052 includes a second probe 20512; wherein the first probe 20511 and the second probe 20512 are at least partially located in the incident resonant cavity 201. It should be noted that the first probe 20511 and the second probe 20512 are made of a dielectric material, and changing the dielectric material of the first probe 20511 and the second probe 20512 or changing the length of the depth into the incident resonant cavity 201 can change the resonant frequency of the incident resonant cavity 201.

[0045] In combination with Figure 4A through Figure 4D , the first wall plate 400 can further include two probe holes 402 for the first probe 20511 and the second probe 20512 to probe into the incident resonant cavity 201. As shown in Figure 4A and Figure 4C , the two probe holes 402 are arranged on the vertical plane (for example, the xz plane). It should be understood that the two probe holes 402 can be located on the same side of the feed hole 403, or on the opposite side of the feed hole 403 (as shown in Figure 4A and Figure 4C ), which is not limited in the present disclosure. As shown in Figure 4B and Figure 4D , the two probe holes 402 are symmetrically arranged on both sides of the vertical plane (for example, the xz plane).

[0046] In some embodiments, the first micrometer 2051 and the second micrometer 2052 are symmetrically arranged with respect to the vertical plane (for example, the xzWhen the first probe 20511 and the second probe 20512 are symmetrically arranged, the lengths of the first probe 20511 and the second probe 20512 penetrating into the incident resonant cavity 201 are the same, and the medium materials are the same, so as to ensure that the incident resonant cavity 201 can symmetrically and equally modulate the light wave.

[0047] Further, the first micrometer 2051 can further include a first fixed screw 20521, a first locking knob 20531, a first fixed scale cylinder 20541, a first rotating scale cylinder 20551, a first adjusting nut 20561, and a first ratchet wheel 20571. The second micrometer 2052 can further include a second fixed screw 20522, a second locking knob 20532, a second fixed scale cylinder 20542, a second rotating scale cylinder 20552, a second adjusting nut 20562, and a second ratchet wheel 20572.

[0048] It should be understood that the first fixed screw 20521 and the second fixed screw 20522 can be arranged in the fixed assembly 206, so as to fix the first micrometer 2051 and the second micrometer 2052.

[0049] The first adjusting nut 20561 is used to adjust the length of the first probe 20511 penetrating into the incident resonant cavity 201; and the second adjusting nut 20562 is used to adjust the length of the second probe 20512 penetrating into the incident resonant cavity 201.

[0050] It should be noted that the first adjusting nut 20561 and the second adjusting nut 20562 can be manually adjusted to change the resonant frequency of the incident resonant cavity 201.

[0051] In some embodiments, the frequency adjusting assembly 2051, 2052 further includes a motor and a microcontroller unit (MCU) (not shown in the figure); wherein the microcontroller unit is connected to the motor, and is used to control the motor to drive at least one of the first adjusting nut 20561 and the second adjusting nut 20562 to rotate, so as to automatically adjust the resonant frequency of the incident resonant cavity 201. Figure 2

[0052] In order to realize accurate adjustment, a preset relationship database of the resonant frequency and the micrometer scale and the medium material can be established through a large number of experiments and data analysis.

[0053] For example, by changing the distance of the first probe 20511 and the second probe 20512 penetrating into the incident resonant cavity 201, the resonant frequency of the incident resonant cavity 201 is measured by using a network vector analyzer device, and the corresponding micrometer scale value is recorded. Through multiple measurements and data processing, a preset relationship database of the resonant frequency and the micrometer scale and the medium material is established. ​It should be understood that the first probe 20511 and the second probe 20512 are located on a vertical plane, and the first probe 20511 and the second probe 20512 can be adjusted respectively, that is, the depths of the first probe 20511 and the second probe 20512 can be different. The first probe 20511 and the second probe 20512 are symmetrically arranged relative to the vertical plane, and the first probe 20511 and the second probe 20512 are synchronously adjusted, that is, the depths of the first probe 20511 and the second probe 20512 are the same.

[0054] When manual adjustment of the resonant frequency is required, based on the preset relationship database, the operator can drive the first probe 20511 and / or the second probe 20512 to move in the incident resonant cavity 201 by rotating the first adjusting nut 20561 of the first micrometer 2051 and / or the second adjusting nut 20562 of the second micrometer 2052, while ensuring that the medium material is adapted, until the scale of the first micrometer 2051 and / or the second micrometer 2052 corresponds to the corresponding scale of the target resonant frequency in the preset relationship database, that is, the quantitative adjustment of the resonant frequency can be realized to meet the specific application requirements.

[0055] When automatic adjustment of the resonant frequency is required, in some embodiments, the microprocessor is configured to: acquire and query the preset relationship database according to the target resonant frequency to determine the scale and the medium material corresponding to the target resonant frequency; in response to determining that the medium materials of the first probe 20511 and the second probe 20512 meet the requirements of the target resonant frequency, driving at least one of the first adjusting nut 20561 and the second adjusting nut 20562 by using the motor until the scales of the first micrometer 2051 and the second micrometer 2052 meet the requirements of the target resonant frequency. Thus, automatic adjustment of the resonant frequency is realized, and the convenience and accuracy of the adjustment are improved.

[0056] It should be noted that the microprocessor can record the medium materials of the first probe 20511 and the second probe 20512. If the medium materials of the first probe 20511 and the second probe 20512 do not meet the requirements of the target resonant frequency, the medium materials of the first probe 20511 and the second probe 20512 can be prompted to be replaced.

[0057] In some embodiments, the motor can drive the first adjusting nut 20561 and the second adjusting nut 20562 through a transmission mechanism, which is not described in detail in the present disclosure.

[0058] It should be understood that the motor has a corresponding relationship between the working parameters and the scales, and the microprocessor can control the working parameters of the motor to control the scales of the first micrometer 2051 and the second micrometer 2052.

[0059] In summary, the electro-optical modulator provided by the embodiments of the present disclosure can realize symmetric reciprocal modulation. Based on the symmetric arrangement of the incident resonant cavity relative to the vertical plane and the arrangement of the feed-in joint and the adjustment assembly, the light wave can realize symmetric and equal-intensity modulation no matter from the front or back (corresponding to the positive direction or negative direction of the axis) of the electro-optical crystal, solves the problem that the asymmetric design is limited in the application of the light path transmission and receiving links, expands the application range of the modulator, and is especially suitable for the modulation processing of bidirectional optical signals in optical communication systems and optical sensing systems. y

[0060] In addition, the electro-optical modulator provided by the embodiments of the present disclosure can realize precise and flexible resonant frequency adjustment, and in particular, can realize automatic adjustment.

[0061] It should be understood by those skilled in the art that the above discussion of any of the embodiments is merely exemplary and is not intended to suggest the scope of the present disclosure (including the claims) is limited to these examples; under the idea of the present disclosure, the technical features in the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other changes of different aspects of the embodiments of the present disclosure as described above, which are not provided in details for the sake of brevity.

[0062] The embodiments of the present disclosure are intended to cover all such alternatives, modifications, and variations as fall within the broad scope of the appended claims. Accordingly, any and all such modifications, variations, and equivalents that fall within the spirit and scope of the disclosed embodiments are intended to be included.​

Claims

1. An electro-optic phase modulator, characterized by, The system comprises: an incident resonant cavity comprising a first through-hole; an exit resonant cavity comprising a second through-hole; an electro-optic crystal comprising a first surface electrode and a second surface electrode arranged oppositely; wherein the first surface electrode is directed towards the first through-hole so that a radio frequency signal modulated by the incident resonant cavity passes through the first through-hole into the electro-optic crystal; the second surface electrode is directed towards the second through-hole so that the radio frequency signal passing through the electro-optic crystal enters the exit resonant cavity via the second through-hole; an optical path of the electro-optic crystal is parallel to the first surface electrode; the incident resonant cavity is arranged symmetrically based on a vertical plane of the optical path; a feed-in joint arranged on a first wall panel of the incident resonant cavity away from the exit resonant cavity and on the vertical plane, for emitting the radio frequency signal; and a frequency tuning assembly at least partially located in the incident resonant cavity and arranged on the vertical plane or symmetrically relative to the vertical plane.

2. The electro-optic phase modulator of claim 1, wherein, The system further comprises a fixing assembly; the fixing assembly and the incident resonant cavity cooperate to fix the frequency tuning assembly.

3. The electro-optic phase modulator of claim 1, wherein, The frequency tuning assembly comprises a first micrometer and a second micrometer; wherein the first micrometer and the second micrometer are both arranged on the vertical plane; or the first micrometer and the second micrometer are symmetrically arranged relative to the vertical plane.

4. The electro-optic phase modulator of claim 3, wherein, The first micrometer comprises a first probe, and the second micrometer comprises a second probe; wherein the first probe and the second probe are at least partially located in the incident resonant cavity.

5. The electro-optic phase modulator of claim 4, wherein, The first micrometer further comprises a first adjusting nut, and the second micrometer further comprises a second adjusting nut; wherein the first adjusting nut is used to adjust the length of the first probe entering the incident resonant cavity; and the second adjusting nut is used to adjust the length of the second probe entering the incident resonant cavity.

6. The electro-optic phase modulator of claim 5, wherein, The frequency tuning assembly further comprises a motor and a microprocessor; wherein the microprocessor is connected to the motor, for controlling the motor to drive at least one of the first adjusting nut and the second adjusting nut to rotate.

7. The electro-optic phase modulator of claim 6, wherein, The microprocessor is configured to: acquire and query a preset relational database according to a target resonant frequency, to determine a scale and a dielectric material corresponding to the target resonant frequency; in response to determining that the dielectric materials of the first probe and the second probe meet the requirements of the target resonant frequency, driving at least one of the first adjusting nut and the second adjusting nut by using the motor, until the scales of the first micrometer and the second micrometer meet the requirements of the target resonant frequency.

8. The electro-optic phase modulator of claim 1, wherein, The system further comprises a first pressing plate and a second pressing plate; wherein the first pressing plate and the second pressing plate press the electro-optic crystal, and the first pressing plate is connected to the side wall of the incident resonant cavity and the exit resonant cavity, and the second pressing plate is connected to the side wall of the incident resonant cavity and the exit resonant cavity.

9. The electro-optic phase modulator of claim 1, wherein, The system further comprises a temperature control assembly for adjusting the working temperature of the electro-optic phase modulator.

10. An electro-optic phase modulation system comprising the electro-optic phase modulator according to any one of claims 1-9.

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