Electro-optic medium rod interconnection structure and electro-optic sampling device

Abstract

The application discloses an electro-optic medium rod interconnection structure and an electro-optic sampling device, and solves the problem of large mode loss caused by discontinuous interconnection devices in the prior art. The electro-optic medium rod interconnection structure comprises a medium rod and a rectangular waveguide. The medium rod is partially inserted into through cavities of the rectangular waveguide on both sides. The medium rod has a plane for receiving a vertical incident laser pulse signal on a middle section. The electro-optic sampling device comprises: the electro-optic medium rod interconnection structure, which is used for adding information of a transmitted high-speed pulse signal to be measured into a pulse laser signal. A laser pulse module is used for focusing the laser pulse signal to the electro-optic medium rod interconnection structure. A photoelectric detection module is used for converting the laser pulse signal carrying information into an electric pulse signal. A data acquisition module is used for processing the electric pulse signal and extracting high-speed pulse signal information. The electro-optic medium rod interconnection structure is a continuous structure, and can effectively avoid large mode loss of the device.

Description

Technical Field

[0001] This application relates to the field of radio metrology and testing technology, and in particular to an electro-optic dielectric rod interconnection structure and an electro-optic sampling device. Background Technology

[0002] Electro-optic sampling technology has proven to be a powerful measurement method for characterizing high-frequency electrical devices and is used by metrology institutions in many countries. This technology uses optical methods to generate very short electrical pulse signals, which can be detected by a synchronous probe beam with the same repetition frequency. Typically, the probe beam is time-delayed by a precisely controlled translation stage to achieve time-equivalent sampling. This technology has been applied to the study of transfer functions, reflection coefficients, and other transmission properties, and is also widely used in the terahertz spectrum.

[0003] In traditional electro-optic sampling devices, the high-speed pulse signal under test is transmitted through coaxial interconnects. These interconnects typically consist of a coaxial cable, matched insulators, insulator probes, an input plane transition circuit interconnect structure, and a coplanar waveguide chip. By sampling optical pulses, the high-speed pulse signal transmitted through the coaxial interconnect structure is sampled, thus enabling waveform measurement. However, because the interconnects are discontinuous structures, mode mismatch at the connection points often leads to significant mode loss. Furthermore, the difference in signal propagation speed between the dielectric and the coplanar waveguide transmission line also results in substantial radiation loss. Summary of the Invention

[0004] This application provides an electro-optic dielectric rod interconnect structure and an electro-optic sampling device, which solves the problem of large mode loss caused by discontinuity of interconnect devices in the prior art.

[0005] This application also provides an electro-optic dielectric rod interconnect structure, comprising a dielectric rod and a rectangular waveguide. Parts at both ends of the dielectric rod are inserted into the through-cavities of the rectangular waveguides on both sides. A plane is located on the middle section of the dielectric rod for receiving perpendicularly incident laser pulse signals.

[0006] Preferably, the medium rod is thin at both ends and thick in the middle.

[0007] Furthermore, the cross-section of the medium rod is rectangular.

[0008] Furthermore, the cross-sectional width of the dielectric rod remains unchanged, while the height decreases linearly from the middle to both ends of the dielectric rod.

[0009] Furthermore, the medium rod includes an intermediate section and a connecting section. The intermediate section is a cuboid. The connecting section is a variable cross-section beam with one thicker end and the other thinner end. The thicker end of the connecting section is connected to the intermediate section.

[0010] Preferably, the thinnest end of the connecting segment gradually reaches zero height.

[0011] Preferably, the dielectric rod is a gallium arsenide semiconductor.

[0012] This application also provides an electro-optic sampling device, using the electro-optic dielectric rod interconnect structure described in any of the above embodiments, and further comprising a laser pulse module, a photoelectric detection module, and a data acquisition module. The electro-optic dielectric rod interconnect structure is used to transmit a high-speed pulse signal to be measured and to append information of the high-speed pulse signal to the pulsed laser signal. The laser pulse module is used to generate a laser pulse signal and focus it onto the electro-optic dielectric rod interconnect structure. The photoelectric detection module is used to detect the laser pulse signal carrying the high-speed pulse signal and convert it into an electrical pulse signal. The data acquisition module is used to process the electrical pulse signal output by the photoelectric detection module and extract the appended high-speed pulse signal information.

[0013] Furthermore, it also includes a signal processing module for modulating the high-speed pulse signal under test and providing the modulated signal as a reference to the data acquisition module.

[0014] Furthermore, the laser pulse module includes a laser pulse generation module and a laser control module. The laser pulse generation module is used to generate laser pulse signals. The laser control module is used to receive and polarize the laser pulse signals generated by the laser pulse generation module.

[0015] The above-described technical solutions adopted in the embodiments of this application can achieve the following beneficial effects:

[0016] The electro-optic dielectric rod interconnection structure of this application is a continuous structure, which can effectively avoid large mode loss in the device. At the same time, due to the widening design in the middle of the dielectric rod, the laser pulse signal has a longer optical path. Therefore, the different transmission speeds of the signal on the dielectric and the coplanar waveguide transmission line will not cause large radiation loss in the device. Attached Figure Description

[0017] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0018] Figure 1 This is a structural diagram of an embodiment of an electro-optic dielectric rod interconnect structure according to this application;

[0019] Figure 2 This is a structural diagram of an embodiment of an electro-optic sampling device according to this application. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0021] The technical solutions provided by the various embodiments of this application are described in detail below with reference to the accompanying drawings.

[0022] Figure 1 This is a structural diagram of an embodiment of an electro-optic dielectric rod interconnection structure according to this application.

[0023] An electro-optic dielectric rod interconnect structure 1 includes a dielectric rod 11 and a rectangular waveguide 12. Parts at both ends of the dielectric rod are inserted into the through cavities of the rectangular waveguides on both sides. A plane is located on the middle section of the dielectric rod to receive perpendicularly incident laser pulse signals.

[0024] The dielectric rod can be a uniform rod-shaped structure, a rod-shaped structure that is thinner at both ends and thicker in the middle, or an irregular shape without affecting the propagation of the high-speed pulse signal. However, the long optical path of the laser pulse signal in the dielectric rod can effectively prevent the device from having large radiation losses due to the different propagation speeds between the dielectric and the coplanar waveguide transmission line. Therefore, preferably, the dielectric rod is thinner at both ends and thicker in the middle.

[0025] The dielectric rod has a rectangular cross-section. After the dielectric rod extends a certain distance into the through-cavity, its cross-section matches the inner diameter of the opening portion of the rectangular waveguide's through-cavity. The side perpendicular to the incident direction of the laser pulse signal is the first side, and the side parallel to the incident direction of the laser pulse signal is the second side.

[0026] The dielectric rod has a rectangular cross-section. When the rectangular through-cavities of the rectangular waveguides are inserted at both ends, the four sides of the dielectric rod can match the inner diameter of the opening of the through-cavities, so that the two fit tightly together.

[0027] The cross-sectional width of the dielectric rod remains constant, while its height decreases linearly from the middle to both ends.

[0028] For example, the width of the first side remains constant. The width of the second side decreases linearly from the middle of the dielectric rod to both ends.

[0029] It should be noted that increasing the optical path only requires increasing it in the direction of the laser pulse signal incident. Therefore, the length of the side perpendicular to the laser pulse signal incident direction does not need to be changed, which makes the processing convenient and saves materials.

[0030] The medium rod comprises a middle section and a connecting section. The middle section is a cuboid. The connecting section is a variable cross-section beam, thicker at one end and thinner at the other. The thicker end of the connecting section is connected to the middle section.

[0031] The rectangular shape of the dielectric rod in the middle is designed so that the incident surface of the laser pulse signal is flat, thereby reducing the reflection of the laser signal. The laser signal is incident on the upper surface of the dielectric rod and exits from the lower surface. If the incident surface of the laser pulse were a slope, the outgoing signal would be weakened due to reflection.

[0032] Because the middle section of the dielectric rod needs a plane where the laser pulse signal is incident perpendicularly, and to extend the optical path, the dielectric rod is processed into a variable cross-section beam structure that is thicker in the middle and thinner at both ends. Therefore, the middle section, located in the middle, is essentially a rectangle with the second side being longer. One end of the connecting section connects to the middle section, and the other end needs to be inserted into the through cavity; therefore, it is a variable cross-section beam structure that is thicker at one end and thinner at the other.

[0033] The connecting segment inserted into the through cavity can have an end face, a straight line structure, or an endpoint. An endpoint structure requires the connecting segment end to be machined into a circle, which doesn't fit the structure of the through cavity and is inconvenient to machine. An end face structure will reflect high-speed pulse signals, causing interference. Therefore, preferably, the thinnest end of the connecting segment gradually reaches zero height. That is, the second side of the thinnest end of the connecting segment is zero, forming a straight line structure with a zero second side.

[0034] The dielectric rod can be selected from gallium arsenide (GaAs) semiconductors, or from electro-optic crystals with large electro-optic coefficients such as zinc telluride (ZnTe) and gallium phosphide (GaP). However, gallium arsenide is more stable and its processing technology is more mature in China; therefore, gallium arsenide semiconductors are preferred.

[0035] For example, the electro-optic dielectric rod interconnect structure uses gallium arsenide semiconductor. The dimensions of the middle section of the dielectric rod are 5mm × 0.5mm × 1mm, and the length of the connecting section is 8mm. For the high-speed pulse signal under test in the range of 220GHz to 325GHz, a rectangular waveguide of WR-3 is selected, with a waveguide wall thickness of 0.1mm and external dimensions of 5.45mm × 0.6318mm × 1.0636mm. The end of the dielectric rod connecting section forms a radiating cone inserted into the waveguide to a depth of 2.5mm. The high-speed pulse signal under test is transmitted from the standard matched waveguide into the dielectric rod interconnect structure and then output from the standard matched waveguide. During the transmission of the high-speed pulse signal under test, the laser pulse signal is focused by the laser control module onto the surface of the middle section of the dielectric rod of the dielectric rod interconnect structure. After passing through the dielectric rod interconnect structure, the laser pulse signal undergoes a linear electro-optic effect, and its polarization state changes, thereby carrying the information of the high-speed pulse signal under test in the laser pulse signal.

[0036] Figure 2 This is a structural diagram of an embodiment of an electro-optic sampling device according to this application.

[0037] An electro-optic sampling device, using the electro-optic dielectric rod interconnection structure 1 described in any of the above embodiments, further includes a laser pulse module 2, a photoelectric detection module 3, and a data acquisition module 4.

[0038] The electro-optic dielectric rod interconnect structure is used to transmit a high-speed pulse signal under test and to append information of the high-speed pulse signal under test to a pulsed laser signal. It is used for transmitting the high-speed pulse signal under test and appending information of the high-speed pulse signal under test to a laser pulse signal that penetrates the dielectric rod interconnect structure.

[0039] The laser pulse module is used to generate laser pulse signals and focus the laser pulse signals onto the electro-optic dielectric rod interconnect structure.

[0040] The laser pulse module includes a laser pulse generation module 21 and a laser control module 22.

[0041] The laser pulse generation module is used to generate laser pulse signals, which serve as the information carrier for the high-speed pulse signal under test.

[0042] For example, a femtosecond pulsed laser with a wavelength of 1550nm can be selected. This wavelength of femtosecond laser has a good responsivity in photodetectors and a very small response in dielectric rods.

[0043] The laser control module is used to receive and focus the laser pulse signal generated by the polarization state control and focusing laser pulse generation module onto the surface of the dielectric rod interconnect structure.

[0044] For example, the laser control module includes a polarizer, a half-wavelength lens, and a convex lens with a focal length of 5 cm and a wavelength of 1550 nm that is matched to the wavelength. The polarizer and the half-wavelength lens can be used to adjust the polarization state of the laser pulse signal so that the polarization state of the laser pulse signal has an appropriate angle with the optical axis of the electro-optic crystal of the dielectric rod interconnect structure. Because the dielectric rod interconnect structure is small in size, the convex lens is needed to focus the laser pulse signal onto the surface of the dielectric rod interconnect structure.

[0045] The photoelectric detection module is used to detect laser pulse signals carrying high-speed pulse signals and convert them into electrical pulse signals.

[0046] For example, a quarter-wave plate, a polarizing beam splitter, and a balanced photodiode are used. The laser pulse becomes elliptically polarized light after passing through the quarter-wave plate, and is then split into s-polarized and p-polarized light by the polarizing beam splitter. The balanced photodiode can then extract a current signal that is proportional to the intensity of the high-speed pulse signal being measured.

[0047] The data acquisition module is used to process the electrical pulse signal output by the photoelectric detection module and extract the additional high-speed pulse signal information.

[0048] For example, the lock-in amplifier SR850 was selected.

[0049] It also includes a signal processing module 5, which is used to modulate the high-speed pulse signal under test and provide the modulated signal as a reference to the data acquisition module.

[0050] For example, a function generator can be selected to modulate the high-speed pulse signal under test with a square wave signal, and this square wave signal can be used as a synchronization reference to provide to the lock-in amplifier.

[0051] The above description is merely an embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of this application should be included within the scope of the claims of this application.

Claims

1. An electro-optic medium rod interconnection structure, characterized by, The application relates to an electro-optic medium rod interconnection structure. The medium rod is partially inserted into through cavities of two rectangular waveguides at two ends respectively, and the inner diameter of the medium rod and the opening part of the through cavity are matched; A plane for receiving vertical laser pulse signals is arranged on the middle section of the medium rod.

2. The electro-optic medium rod interconnection structure of claim 1, wherein, The medium rod is thin at two ends and thick in the middle.

3. The electro-optical medium rod interconnection structure according to claim 1 or 2, wherein The cross section of the medium rod is rectangular.

4. The electro-optic medium rod interconnection structure of claim 3, wherein, The cross section width of the medium rod is constant, and the height linearly decreases from the middle to the two ends.

5. The electro-optic medium rod interconnection structure of claim 3, wherein, The medium rod comprises a middle section and a connecting section. The middle section is a cuboid. The connecting section is a variable cross section beam with one end thick and the other end thin. The thick end of the connecting section is connected with the middle section.

6. The electro-optic medium rod interconnection structure of claim 5, wherein, The height of the thinnest end of the connecting section gradually decreases to zero.

7. The structure of claim 1-6, wherein, The medium rod is a gallium arsenide semiconductor.

8. An electro-optic sampling device, characterized by The application further relates to an electro-optic medium rod interconnection structure, a laser pulse module, a photoelectric detection module and a data acquisition module. The application relates to an electro-optic medium rod interconnection structure for transmitting a high-speed pulse signal to be detected and adding information of the high-speed pulse signal to be detected to a pulse laser signal. The laser pulse module is used for generating a laser pulse signal and focusing the laser pulse signal to the electro-optic medium rod interconnection structure. The photoelectric detection module is used for detecting the laser pulse signal carrying the high-speed pulse signal and converting the laser pulse signal into an electric pulse signal. The data acquisition module is used for processing the electric pulse signal output by the photoelectric detection module and extracting the high-speed pulse signal information added to the electric pulse signal.

9. The electro-optic sampling device of claim 8, wherein, The application further relates to a signal processing module used for modulating the high-speed pulse signal to be detected and providing the modulated signal as a reference to the data acquisition module.

10. The electro-optic sampling device of claim 8, wherein, The laser pulse module comprises a laser pulse generation module and a laser control module. The laser pulse generation module is used for generating a laser pulse signal. The laser control module is used for receiving and polarizing the laser pulse signal generated by the laser pulse generation module.

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