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CN-115567116-B - High-performance radio frequency modulation light emitting module

CN115567116BCN 115567116 BCN115567116 BCN 115567116BCN-115567116-B

Abstract

The invention relates to a high-performance radio frequency modulation light emitting module, which comprises a radio frequency light modulation part, a circuit module and a shell module, wherein the radio frequency light modulation part comprises a laser coupling module, a modulator module, an optical fiber assembly and a radio frequency transmission module, the laser coupling module is used for outputting optical signals and coupling the output optical signals into the modulator module, the modulator module is used for carrying out radio frequency modulation on the optical signals and coupling the modulated radio frequency signals into the optical fiber assembly, the radio frequency transmission module is used for transmitting the radio frequency signals to the modulator module, the circuit module is used for realizing control, monitoring and power supply functions, and the shell module is used for separating the circuit module and the radio frequency light modulation part up and down and sealing and packaging the radio frequency light modulation part. The invention constructs the high-reliability and high-performance radio frequency modulation optical module, and meets the wide remote radio frequency transmission requirement. In addition, the requirements of miniaturization and high integration of the equipment are met in the structure.

Inventors

  • TANG ZHUXI
  • GUAN CHENGGANG
  • LIU RUI
  • CHEN XIAOWEI
  • DENG YUZHEN

Assignees

  • 武汉光迅科技股份有限公司

Dates

Publication Date
20260512
Application Date
20220922

Claims (9)

  1. 1. The high-performance radio frequency modulation light emitting module is characterized by comprising a radio frequency light modulation part, a circuit module (5) and a shell module (6), wherein the radio frequency light modulation part comprises a laser coupling module (1), a modulator module (2), an optical fiber assembly (3) and a radio frequency transmission module (4), the laser coupling module (1) is used for outputting light signals and coupling the output light signals into the modulator module (2), the modulator module (2) is used for carrying out radio frequency modulation on the light signals and coupling the modulated radio frequency signals on the optical fiber assembly (3), the radio frequency transmission module (4) is used for transmitting the radio frequency signals to the modulator module (2), the circuit module (5) is used for realizing control, monitoring and power supply functions, and the shell module (6) is used for separating the circuit module (5) from the radio frequency light modulation part up and down and sealing and packaging the radio frequency light modulation part; the radio frequency transmission module (4) comprises a radio frequency input head (401), a microwave matching network (402), a low noise amplifier (403) and an equalizer (404), wherein radio frequency signals to be transmitted are input from the radio frequency input head (401) and transmitted through the microwave matching network (402), and the low noise amplifier (403) and the equalizer (404) are arranged in the microwave matching network (402) and used for amplifying original radio frequency signal power; the microwave matching network (402) is designed into a multi-section bending shape, the microwave matching network (402) is of a section of horizontal structure and vertical structures at two ends of the horizontal structure in the same direction, when a radio frequency signal is input by the radio frequency input head (401), the radio frequency signal passes through the first section of vertical structure, then passes through the horizontal structure, finally passes through the last section of vertical structure and then reaches the modulator (201), the low noise amplifier (403) is arranged between the first section of vertical structure and the horizontal structure, and the equalizer (404) is arranged between the horizontal structure and the last section of vertical structure.
  2. 2. The high performance radio frequency modulated light emitting module according to claim 1, characterized in that the laser coupling module (1) comprises a laser (101), a collimator lens (102) and a focusing lens (104), wherein the constant power laser light output by the laser (101) is coupled into the waveguide of the modulator module (2) after passing through the collimator lens (102) and the focusing lens (104) in sequence.
  3. 3. The high performance radio frequency modulated light emitting module according to claim 2, characterized in that the laser coupling module (1) further comprises an isolator (103), the isolator (103) being arranged between the collimating lens (102) and the focusing lens (104) for isolating return light.
  4. 4. The high performance radio frequency modulated light emitting module according to claim 1, wherein the modulator module (2) comprises a modulator (201), a radio frequency base (202), a modulator radio frequency load (203), a dc bias interface (204) and a PD (205), wherein the waveguide of the modulator (201) is configured to receive the optical signal output by the laser coupling module (1) and to align the modulated radio frequency signal from the output waveguide end into the optical fiber assembly (3), the modulator radio frequency load (203) is configured to consume residual radio frequency signal energy, the dc bias interface (204) is configured to provide a certain dc bias to the modulator (201), the PD (205) is configured to monitor the modulated optical signal leaking laterally of the modulator (201), and the modulator radio frequency load (203), the dc bias interface (204) and the PD (205) are all mounted on the radio frequency base (202).
  5. 5. The high performance radio frequency modulated light emitting module according to claim 4, wherein the optical fiber assembly (3) comprises an optical fiber fixing block (301) and an optical fiber (302), and the optical fiber core of the optical fiber (302) and the output waveguide end of the modulator (201) are aligned to realize mode field matching so as to couple the modulated radio frequency signal carried by light into the optical fiber (302), and the optical fiber (302) and the modulator (201) are fixed by the optical fiber fixing block (301).
  6. 6. The high performance rf modulated light emitting module of claim 5, wherein the fiber securing block (301) comprises a fiber V-shaped seat (301 a) and a fiber cover (301 b), the optical fiber (302) is clamped between the fiber V-shaped seat (301 a) and the fiber cover (301 b), and the optical fiber (302) is bonded with the fiber V-shaped seat (301 a) and the fiber cover (301 b) by glue filling.
  7. 7. The high-performance rf modulated light emitting module according to claim 6, wherein the optical fiber V-shaped seat (301 a) and the optical fiber cover (301 b) are made of glass material and matched with the thermal expansion coefficient of the optical fiber (302), the optical fiber (302) is stripped by coating of the clamping part, the end faces of the optical fiber V-shaped seat (301 a), the optical fiber cover (301 b) and the optical fiber (302) are flush by grinding, the optical fiber fixing block (301) and the optical fiber (302) are made into the optical fiber assembly (3) with the integral and flush end faces in advance when the coupling fixing of the optical fiber (302) and the modulator (201) is carried out, then the optical fiber assembly (3) is aligned between the fiber core of the optical fiber (302) and the waveguide of the modulator (201), and finally the end face of the optical fiber V-shaped seat (301 a) is bonded with the side non-waveguide area of the modulator (201) to complete the coupling of the optical fiber (302) and the modulator (201).
  8. 8. The high performance radio frequency modulated light emitting module according to any of claims 1-7, wherein the circuit module (5) comprises a circuit board (501) and an electrical interface (502), the electrical interface (502) and the circuit board (501) being connected by one or more of soldering, gold wire, gold tape, the electrical interface (502) providing external power to the inside and internal operating state information to the outside.
  9. 9. The high performance rf modulated light emitting module as set forth in any of claims 1-7, wherein the housing module (6) comprises a package (601), an upper cover plate (602) and a lower cover plate (603), an intermediate spacer layer is provided in the middle of the package (601), a high airtight space is formed between the upper cover plate (602) and the intermediate spacer layer of the package (601) by applying a resistance welding process, so that the rf light modulation part is mounted in the upper airtight space, the lower cover plate (603) is fixed to the package (601), the circuit module (5) is mounted in a lower space formed by the lower cover plate (603) and the intermediate spacer layer of the package (601), an optical fiber tail pipe (601 a) is provided on one side of the package (601) for extending out of the optical fiber (302) of the optical fiber assembly (3), an rf input tube (601 d) is provided on the other side of the package (601) for mounting an rf input head (401) of the rf transmission module (4), a mounting ear mount (601 b) is provided on the bottom of the package (601), a PIN insulator PIN (200) is provided for connecting the module to the outside, PIN (200) is provided on the PIN insulator PIN (100) and PIN (200) is soldered on the middle of the PIN insulator PIN (100), the length of the glass insulator (200) is shorter than that of the conductive PIN needle (100), the glass insulator PIN needle (601 c) is sintered in the tube shell (601) through the glass insulator (200), two end faces of the conductive PIN needle (100) are planes, one end of the conductive PIN needle is located in a closed space on the upper portion of the tube shell (601), and the other end of the conductive PIN needle is located in a lower space of the tube shell (601) so as to be respectively bonded with elements to be connected through gold wires.

Description

High-performance radio frequency modulation light emitting module Technical Field The invention relates to the technical field of radio frequency optical links, in particular to a high-performance radio frequency modulation optical transmitting module which is mainly applied to the fields of optical carrier radio frequency, radio astronomy, radar systems and the like which need long-range radio frequency transmission. Background The radio frequency link is an important component of a plurality of communication systems and is widely applied to the fields of aerospace, radar, remote sensing and telemetry and the like. However, when facing long-distance transmission, transmission loss of transmission media such as conventional cables and radio frequency waveguides increases rapidly, and referring to fig. 1, for example, typical coaxial cables have an X-band loss higher than 1.8dB/m, and it is difficult to realize long-distance radio frequency transmission. In contrast, typical single-mode communication fibers have transmission losses less than 0.2dB/km, much less than conventional cables, and are suitable for long-distance transmission. Therefore, modulating the radio frequency signal to the optical carrier to obtain the transmission capability of the optical waveguide with low loss is an effective way for the radio frequency signal to be transmitted remotely, refer to fig. 2. On the other hand, the radio frequency optical link often has the characteristics of complex application scene and severe application environment, and the existing scheme shown in fig. 1 and 2 cannot meet the increasingly high requirements, and the existing radio frequency link cannot ensure high reliability and high performance, is quite complicated and redundant in structural design, is not compact enough, and cannot meet the requirements of miniaturization and high integration of equipment at present. In view of this, how to overcome the defects or demands of the prior art and solve the above technical problems is a problem to be solved in the art. Disclosure of Invention Aiming at the defects or improvement demands in the prior art, the prior radio frequency link cannot ensure high reliability and high performance, is quite complicated and redundant in structural design, and cannot meet the current requirements on equipment miniaturization and high integration level. The invention provides a high-performance radio frequency modulation light emitting module which is used for meeting the application of remote transmission of radio frequency signals, in particular to an application scene with high requirements on reliability and radio frequency performance. The embodiment of the invention adopts the following technical scheme: The invention provides a high-performance radio frequency modulation light emitting module, which comprises a radio frequency light modulation part, a circuit module and a shell module, wherein the radio frequency light modulation part comprises a laser coupling module, a modulator module, an optical fiber assembly and a radio frequency transmission module, the laser coupling module is used for outputting optical signals and coupling the output optical signals into the modulator module, the modulator module is used for carrying out radio frequency modulation on the optical signals and coupling the modulated radio frequency signals into the optical fiber assembly, the radio frequency transmission module is used for transmitting the radio frequency signals to the modulator module, the circuit module is used for realizing control, monitoring and power supply functions, and the shell module is used for carrying out up-down separation on the circuit module and the radio frequency light modulation part and carrying out sealing encapsulation on the radio frequency light modulation part. Further, the laser coupling module comprises a laser, a collimating lens and a focusing lens, wherein the constant power laser output by the laser sequentially passes through the collimating lens and the focusing lens and is then coupled into the waveguide of the modulator module. Further, the laser coupling module further comprises an isolator, which is arranged between the collimating lens and the focusing lens and is used for isolating return light. Further, the modulator module comprises a modulator, a radio frequency base, a modulator radio frequency load, a direct current bias and a PD, wherein the waveguide of the modulator is used for receiving the optical signal output by the laser coupling module and for aligning and coupling the modulated optical carrier radio frequency signal from an output waveguide end to the optical fiber assembly, the modulator radio frequency load is used for consuming residual radio frequency signal energy, the direct current bias interface is used for providing a certain direct current bias for the modulator, the PD is used for monitoring the modulated optical signal leaked from the side surface of the