CN112311470B - Control method based on double-AOM (automatic optical network management) cascade structure and acousto-optic cascade module - Google Patents
Control method based on double-AOM (automatic optical network management) cascade structure and acousto-optic cascade module Download PDFInfo
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- CN112311470B CN112311470B CN202011197735.XA CN202011197735A CN112311470B CN 112311470 B CN112311470 B CN 112311470B CN 202011197735 A CN202011197735 A CN 202011197735A CN 112311470 B CN112311470 B CN 112311470B
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- 230000003287 optical effect Effects 0.000 title claims abstract description 71
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- 239000013307 optical fiber Substances 0.000 claims abstract description 184
- 230000017525 heat dissipation Effects 0.000 claims abstract description 41
- 238000012545 processing Methods 0.000 claims abstract description 7
- 239000000835 fiber Substances 0.000 claims description 61
- 230000000630 rising effect Effects 0.000 claims description 10
- 230000003111 delayed effect Effects 0.000 claims description 5
- 238000013461 design Methods 0.000 abstract description 12
- 230000001934 delay Effects 0.000 abstract description 2
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- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
- G01D5/32—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light
- G01D5/34—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
- G01D5/353—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre
- G01D5/35338—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre using other arrangements than interferometer arrangements
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Abstract
The invention discloses a control method and an acousto-optic cascade module based on a double-AOM cascade structure, wherein the double-AOM cascade structure of the control method comprises a first optical fiber acousto-optic modulator and a second optical fiber acousto-optic modulator, the control method obtains two paths of radio frequency signals with consistent clocks by processing system clock signals, and respectively outputs the two paths of radio frequency signals to the first optical fiber acousto-optic modulator and the second optical fiber acousto-optic modulator so as to realize the clock unification of the first optical fiber acousto-optic modulator and the second optical fiber acousto-optic modulator, and simultaneously delays the optical pulses generated by the first optical fiber acousto-optic modulator and the second optical fiber acousto-optic modulator with the same external modulation signal so as to realize the delay synchronization of the two optical pulses; the acousto-optic cascade module realizes the miniaturization of the acousto-optic cascade module through the vertical layered design and the heat dissipation structure time of the circuit module and the light path module. Therefore, the scheme can effectively realize the unification of clock signals of the two optical fiber acousto-optic modulators and the time delay synchronization of optical pulses, and simultaneously realize the miniaturization of the acousto-optic cascade module.
Description
Technical Field
The invention relates to the technical field of acousto-optic fiber sensing, in particular to a control method based on a double-AOM (automatic optical module) cascade structure and an acousto-optic cascade module.
Background
The Doppler laser wind measuring radar, laser vibration measuring, distance measuring and distributed optical fiber sensing system has a series of excellent performances and characteristics of high detection precision, non-contact measurement and the like, and has wide application prospect and important application value in the field of military and civil use. At present, the system at home and abroad adopts the design of a photoelectric detector, an optical fiber acousto-optic modulator and passive optical fiber devices which are separated, has the defects of large volume, high power consumption, heavy weight, poor universality and the like, and greatly limits the integration and application fields of the whole system.
The optical fiber acousto-optic modulator (AOM) is a core device influencing the system performance, and the extinction ratio parameter of the optical fiber acousto-optic modulator device determines the capability of the system for weak detection.
In the prior art, there are two arrangements of the fiber acousto-optic modulator (AOM): one is to use a single AOM; the other is a mode of adopting double AOM cascade. The single AOM method has the following disadvantages in the using process: 1. the extinction ratio is insufficient, and the extinction ratio of a single AOM is generally only over 50 dB; 2. the contradiction between minimum optical pulse and system processing power; the optical pulse width determines the distance resolution in Doppler laser wind measuring radar, laser vibration measurement, distance measurement and distributed optical fiber sensing systems, in order to obtain smaller optical pulse width, the AOM optical pulse rise time needs to be increased, the AOM frequency corresponding to the increase of the optical pulse time is correspondingly increased, and the AOM frequency is increased, so that the subsequent detector bandwidth and the capability of a data acquisition card can also require higher requirements; for example, for the minimum pulse width of 15ns, the rise time of the light pulse is required to be less than or equal to 8ns, the AOM frequency is required to be more than or equal to 200MHz, and the capacity of a detector and an acquisition card is required to be more than 400 MHz. However, the dual AOM cascade method in the prior art is a simple combination of two AOMs, each AOM has an independent driver, and the following disadvantages exist in the using process: 1. the two AOMs can cause inconsistency of difference frequency and phase due to inconsistency of clock signals; 2) the optical pulses of the two AOMs require extra control delay to achieve synchronization; 3) the optical pulse output by the two AOMs has large jitter; 4) two AOMs increase the volume.
Disclosure of Invention
Aiming at the defects in the prior art, the technical problem to be solved by the invention is as follows: how to provide a control method based on a double-AOM cascade structure, which can effectively realize the unification of clock signals of two optical fiber acousto-optic modulators.
In addition, the invention also provides an acousto-optic cascade module based on the double-AOM cascade structure, so that the clock signals of the two optical fiber acousto-optic modulators in the acousto-optic cascade module are unified, and the volume of the whole acousto-optic cascade module is greatly reduced.
In order to solve the technical problems, the invention adopts the following technical scheme:
a control method based on a double-AOM cascade structure comprises a first optical fiber acousto-optic modulator and a second optical fiber acousto-optic modulator, wherein a system clock signal is processed to obtain two paths of radio frequency signals with the same clock, and the two paths of radio frequency signals are respectively output to the first optical fiber acousto-optic modulator and the second optical fiber acousto-optic modulator, so that the clock unification of the first optical fiber acousto-optic modulator and the second optical fiber acousto-optic modulator is realized.
Therefore, the scheme processes the system clock signal to obtain two paths of radio frequency signals with the same clock signal, and then respectively outputs the two paths of radio frequency signals to the first optical fiber acousto-optic modulator and the second optical fiber acousto-optic modulator, so that the clock signals obtained by the first optical fiber acousto-optic modulator and the second optical fiber acousto-optic modulator are consistent, and the clock signals are also consistent with the system clock signal, thereby completely realizing the clock consistency of the user system clock, the first optical fiber acousto-optic modulator and the second optical fiber acousto-optic modulator.
Preferably, the optical fiber acousto-optic modulator further comprises an AOM driver, wherein a clock input interface, a first radio frequency output interface and a second radio frequency output interface are arranged on the AOM driver, a phase-locked loop or a direct digital frequency synthesizer is arranged in the AOM driver, the clock input interface is used for accessing a system clock, the first radio frequency output interface is used for being connected with the first optical fiber acousto-optic modulator, and the second radio frequency output interface is used for being connected with the second optical fiber acousto-optic modulator;
and after entering the AOM driver through the clock input interface, the system clock generates two paths of radio frequency signals with consistent clocks through a phase-locked loop or a direct digital frequency synthesizer, wherein one path of radio frequency signal is output to the first optical fiber acousto-optic modulator through a first radio frequency output interface so as to drive the first optical fiber acousto-optic modulator, and the other path of radio frequency signal is output to the second optical fiber acousto-optic modulator through a second radio frequency output interface so as to drive the second optical fiber acousto-optic modulator.
Therefore, by arranging the AOM driver, introducing the system clock signal into the AOM driver, processing one path of system clock signal into two paths of radio frequency signals with consistent clock signals through a phase-locked loop or a direct digital frequency synthesizer in the AOM driver, and simultaneously connecting the first optical fiber acousto-optic modulator and the second optical fiber acousto-optic modulator to the AOM driver, the two paths of radio frequency signals with consistent clock signals generated on the AOM driver are respectively output to the first optical fiber acousto-optic modulator and the second optical fiber acousto-optic modulator, so that the aim that the system clock signal, the clock signal of the first optical fiber acousto-optic modulator and the clock signal of the second optical fiber acousto-optic modulator are always kept uniform through the AOM driver is fulfilled.
Preferably, the AOM driver is further provided with an external modulation input interface, the AOM driver is further provided with a first delay adjustable module and a second delay adjustable module, the first delay adjustable module is respectively connected to the external modulation input interface and the first fiber acousto-optic modulator to adjust the delay of the optical pulse generated by the first fiber acousto-optic modulator with respect to the external modulation signal generated by the external modulation input interface, and the second delay adjustable module is respectively connected to the external modulation input interface and the second fiber acousto-optic modulator to adjust the delay of the optical pulse generated by the second fiber acousto-optic modulator with respect to the external modulation signal generated by the external modulation input interface.
Therefore, the first delay adjustable module and the second delay adjustable module are arranged and are respectively connected with the first optical fiber acousto-optic modulator and the second optical fiber acousto-optic modulator, and double-path delay is independently adjustable aiming at the problem of inconsistent optical pulse delay of the two optical fiber acousto-optic modulators. The delay adjustable module is added after the modulation signal of each driver is input, the delay of the optical pulse of one optical fiber acousto-optic modulator relative to the external modulation signal is firstly tested, then the delay of the optical pulse of each optical fiber acousto-optic modulator relative to the external modulation signal is respectively adjusted, and finally the purpose of consistent optical pulse relative trigger signals of each optical fiber acousto-optic modulator can be achieved.
Preferably, the rising time of the light pulses generated by the first fiber acousto-optic modulator and the second fiber acousto-optic modulator are independently adjusted, so that the light pulses generated by the first fiber acousto-optic modulator and the second fiber acousto-optic modulator slowly rise at the rising edge.
In this way, since the optical pulse has a problem of pulse distortion after amplification, in the present embodiment, the rise time of each optical pulse is adjusted so that each optical pulse rises slowly at the rising edge, and the buffering process at the rising edge of each optical pulse is implemented, so that the pulse distortion after the optical pulse amplification is reduced, and the quality of the output signal is ensured.
An acousto-optic cascade module for realizing the control method based on the double-AOM cascade structure comprises a circuit module and a light path module, wherein the circuit module and the light path module are vertically arranged in a layered manner, and a first optical fiber acousto-optic modulator and a second optical fiber acousto-optic modulator are symmetrically distributed in the light path module;
the circuit module processes the system clock signal to obtain two paths of radio frequency signals with the same clock, and the two paths of radio frequency signals are respectively output to the first optical fiber acousto-optic modulator and the second optical fiber acousto-optic modulator, so that the clock unification of the first optical fiber acousto-optic modulator and the second optical fiber acousto-optic modulator is realized.
In this way, the circuit modules and the light path modules in the acousto-optic cascade module are arranged in a vertical layered manner, so that the space occupied by the whole acousto-optic cascade module in the horizontal direction is greatly reduced, the miniaturization design of the whole acousto-optic cascade module is further realized, and the integrated module design of each part in the acousto-optic cascade module can also be realized by arranging the circuit modules and the light path modules in a layered manner; in addition, the first optical fiber acousto-optic modulator and the second optical fiber acousto-optic modulator are symmetrically distributed on two sides of the light path module, so that optical fibers between the two AOMs can be conveniently coiled; meanwhile, the circuit module is used for processing the system clock signals to obtain two paths of radio frequency signals with the same clock, and the two paths of radio frequency signals are respectively output to the first optical fiber acousto-optic modulator and the second optical fiber acousto-optic modulator, so that the clock signals of the first optical fiber acousto-optic modulator and the second optical fiber acousto-optic modulator can be conveniently and uniformly controlled. Therefore, the volume of the acousto-optic cascade module is greatly reduced, and the clock signals of the two optical fiber acousto-optic modulators in the acousto-optic cascade module are unified.
Preferably, the circuit module includes a circuit mounting seat, the light path module includes a light path housing, the first optical fiber acousto-optic modulator and the second optical fiber acousto-optic modulator are both mounted on the light path housing, a first through hole is formed at a position where the first optical fiber acousto-optic modulator is mounted at the bottom of the light path housing, a second through hole is formed at a position where the second optical fiber acousto-optic modulator is mounted at the bottom of the light path housing, a first heat dissipation block is arranged at the first through hole, two ends of the first heat dissipation block are respectively connected with the first optical fiber acousto-optic modulator and the circuit mounting seat, so that heat generated by the first optical fiber acousto-optic modulator can be transmitted to the circuit mounting seat through the first heat dissipation block, a second heat dissipation block is arranged at the second through hole, two ends of the second heat dissipation block are respectively connected with the second optical fiber acousto-optic modulator and the circuit mounting seat, so that the heat generated by the second fiber acousto-optic modulator can be transferred to the circuit mounting seat through the second heat dissipation block.
Thus, in the working process, the first optical fiber acousto-optic modulator and the second optical fiber acousto-optic modulator can generate a large amount of heat which is not dissipated in time to easily cause the damage of the first optical fiber acousto-optic modulator and the second optical fiber acousto-optic modulator, so that in the scheme, the first heat dissipation block is arranged at the first optical fiber acousto-optic modulator, and the second heat dissipation block is arranged at the second optical fiber acousto-optic modulator, therefore, the heat generated at the first optical fiber acousto-optic modulator and the second optical fiber acousto-optic modulator can be timely transmitted to the first heat dissipation block and the second heat dissipation block, and the heat transmitted to the first heat dissipation block and the second heat dissipation block is further transmitted to the metal bottom plate of the circuit mounting seat, thereby avoiding the accumulation of the heat at the first optical fiber acousto-optic modulator and the second optical fiber acousto-optic modulator, and enabling the heat at the first optical fiber acousto-optic modulator and the second optical fiber acousto-optic modulator to be timely dissipated, the normal work of the first optical fiber acousto-optic modulator and the second optical fiber acousto-optic modulator is ensured.
Preferably, the first heat dissipation block and the second heat dissipation block are both heat dissipation blocks with T-shaped structures, long edges of the T-shaped structures of the first heat dissipation block and the second heat dissipation block are respectively connected with the first optical fiber acousto-optic modulator and the second optical fiber acousto-optic modulator, and short edges of the T-shaped structures of the first heat dissipation block and the second heat dissipation block are respectively connected with the circuit mounting seat at corresponding positions.
Like this, set up first radiating block and second radiating block into T type structure, and be connected the long limit of first radiating block and second radiating block T type structure with first optic fibre acoustic optical modulator and second optic fibre acoustic optical modulator, can make the radiating block have great area of contact with the optic fibre acoustic optical modulator that corresponds the position like this, make the radiating block of optic fibre acoustic optical modulator's heat transmission in time for corresponding the position through great area of contact from this, the rethread radiating block transmits and gives off on the circuit mount pad, the radiating block of T type structure can also effectual volume and the weight that reduces whole radiating block when guaranteeing the radiating.
Preferably, the long side size of the first radiating block T-shaped structure is matched with the size of the corresponding position of the first optical fiber acousto-optic modulator, the long side size of the second radiating block T-shaped structure is matched with the size of the corresponding position of the second optical fiber acousto-optic modulator, the short side of the first radiating block T-shaped structure is fixedly connected with the circuit mounting seat, and the short side of the second radiating block T-shaped structure is fixedly connected with the circuit mounting seat.
Therefore, the long edge size of the T-shaped structure of the radiating block is matched with the size of the corresponding position of the optical fiber acousto-optic modulator, so that the radiating block and the optical fiber acousto-optic modulator have the largest contact area, the radiating area of the optical fiber acousto-optic modulator can be increased, the radiating capacity is improved, the heat accumulation of the local area of the optical fiber acousto-optic modulator can be avoided, and the heat of each position of the optical fiber acousto-optic modulator can be uniformly and effectively radiated; meanwhile, the short edge of the T-shaped structure of the radiating block is connected with the circuit mounting seat through a screw, so that the radiating block and the circuit mounting seat can be conveniently positioned and connected.
Preferably, the circuit module comprises a first radio frequency module and a second radio frequency module, a first working chamber and a second working chamber are arranged on the circuit mounting seat, the first working chamber and the second working chamber are respectively covered with a first shielding plate and a second shielding plate, the first radio frequency module is installed in the first working chamber, and the second radio frequency module is installed in the second working chamber.
Therefore, the first radio frequency module and the second radio frequency module in the circuit module are designed in a cavity-splitting mode, and each working cavity is covered with the shielding plate, so that crosstalk among radio frequency signals in different working cavities can be effectively inhibited, and an anti-interference effect is achieved.
Preferably, a third through hole is formed in the bottom of the first working chamber, the third through hole is detachably connected with and installed on a first mounting plate outside the circuit mounting seat, so that the first mounting plate is detached from the third through hole and then can be detached to perform time delay adjustment on a signal of the first radio frequency module through the third through hole, a fourth through hole is formed in the bottom of the second working chamber, the fourth through hole is detachably connected with and installed on a second mounting plate outside the circuit mounting seat, so that the second mounting plate is detached from the fourth through hole and then can be detached to perform time delay adjustment on the signal of the second radio frequency module through the fourth through hole.
Therefore, by arranging the first mounting plate and the second mounting plate, when the radio-frequency signals of the first radio-frequency module and the second radio-frequency module need to be subjected to delay adjustment, the first mounting plate and the second mounting plate at corresponding positions are detached, so that the first radio-frequency module and the second radio-frequency module are respectively exposed through the third through hole and the fourth through hole, and the signal delay adjustment can be conveniently carried out on the first radio-frequency module and the second radio-frequency module.
Compared with the prior art, the invention has the following advantages:
1. the high-frequency AOM cascade design ensures high extinction ratio, large dynamic range and flexible frequency shift range, and is very suitable for weak signal detection;
2. the pulse signal width can be defined by a user, the minimum time can reach 10ns, and the time domain resolution can be effectively improved;
3. the design of clock external input is convenient for synchronizing with a system clock, and the system is ensured to have high phase consistency;
4. the double-path delay is adjustable, the utilization rate of optical pulse is improved, and the optical fiber delay optical fiber is flexibly suitable for different optical fiber systems;
5. the design of adjustable light pulse leading edge can effectively reduce the pulse distortion generated by laser amplification.
Drawings
FIG. 1 is a schematic block diagram of a control method based on a dual AOM cascade structure according to the present invention;
FIG. 2 is a time domain diagram of output optical pulses of two fiber acousto-optic modulators in the control method based on the dual AOM cascade structure according to the present invention;
FIG. 3 is a time domain diagram (a) and a time domain diagram (b) of an optical pulse obtained by a control method of the prior art;
FIG. 4 is an optical pulse time domain diagram (a) and an optical pulse time domain diagram (b) obtained by the control method based on the dual AOM cascade structure according to the present invention;
FIG. 5 is a schematic structural diagram of an acousto-optic cascade module based on a dual AOM cascade structure according to the present invention;
FIG. 6 is a schematic diagram of the arrangement of a first fiber acousto-optic modulator and a second fiber acousto-optic modulator in an optical path module in an acousto-optic cascade module based on a dual AOM cascade structure according to the present invention in an optical path housing;
FIG. 7 is a schematic view of the lower side structure of the optical path module in the acousto-optic cascade module based on the dual AOM cascade structure of the present invention;
FIG. 8 is a schematic diagram of an upper side structure of a circuit module in an acousto-optic cascade module based on a dual AOM cascade structure according to the present invention;
FIG. 9 is a schematic diagram of an upper side structure of a circuit module in an acousto-optic cascade module based on a dual AOM cascade structure, after a first shielding plate and a second shielding plate are removed;
FIG. 10 is a schematic diagram of the underside of a circuit module in an acousto-optic cascade module based on a dual AOM cascade structure according to the present invention;
fig. 11 is a schematic view of a lower side structure of a circuit module in an acousto-optic cascade module based on a dual AOM cascade structure, in which a first mounting board and a second mounting board are removed.
Description of reference numerals: the optical module comprises an optical path module 1, an optical path shell 11, a first optical fiber acousto-optic modulator 12, a second optical fiber acousto-optic modulator 13, a first heat dissipation block 14, a second heat dissipation block 15, a circuit module 2, a circuit mounting seat 21, a first shielding plate 22, a second shielding plate 23, a first radio frequency module 24, a second radio frequency module 25, a first mounting plate 26 and a second mounting plate 27.
Detailed Description
The invention will be further explained with reference to the drawings and the embodiments.
As shown in fig. 1, a control method based on a dual-AOM cascade structure includes a first fiber acousto-optic modulator 12 and a second fiber acousto-optic modulator 13, and the control method obtains two paths of radio frequency signals with the same clock by processing a system clock signal, and outputs the two paths of radio frequency signals to the first fiber acousto-optic modulator 12 and the second fiber acousto-optic modulator 13 respectively, so as to realize clock unification of the first fiber acousto-optic modulator 12 and the second fiber acousto-optic modulator 13.
In this way, the scheme processes the system clock signal to obtain two paths of radio frequency signals with the same clock signal, and then outputs the two paths of radio frequency signals to the first optical fiber acousto-optic modulator 12 and the second optical fiber acousto-optic modulator 13 respectively, so that the clock signals obtained by the first optical fiber acousto-optic modulator 12 and the second optical fiber acousto-optic modulator 13 are the same, and the clock signals are also consistent with the system clock signal, thereby completely realizing the clock consistency of the user system clock, the first optical fiber acousto-optic modulator 12 and the second optical fiber acousto-optic modulator 13.
In this embodiment, the optical fiber acousto-optic modulator further includes an AOM driver, where the AOM driver is provided with a clock input interface, a first radio frequency output interface and a second radio frequency output interface, the AOM driver is internally provided with a phase-locked loop or a direct digital frequency synthesizer, the clock input interface is used for accessing a system clock, the first radio frequency output interface is used for being connected with the first optical fiber acousto-optic modulator 12, and the second radio frequency output interface is used for being connected with the second optical fiber acousto-optic modulator 13;
after entering the AOM driver through the clock input interface, the system clock generates two paths of radio frequency signals with the same clock through the phase-locked loop or the direct digital frequency synthesizer, wherein one path of radio frequency signal is output to the first fiber acousto-optic modulator 12 through the first radio frequency output interface to realize driving of the first fiber acousto-optic modulator 12, and the other path of radio frequency signal is output to the second fiber acousto-optic modulator 13 through the second radio frequency output interface to realize driving of the second fiber acousto-optic modulator 13.
Therefore, by arranging the AOM driver, introducing the system clock signal into the AOM driver, processing one path of system clock signal into two paths of radio frequency signals with consistent clock signals through a phase-locked loop or a direct digital frequency synthesizer in the AOM driver, and simultaneously connecting the first optical fiber acousto-optic modulator 12 and the second optical fiber acousto-optic modulator 13 to the AOM driver, the two paths of radio frequency signals with consistent clock signals generated on the AOM driver are respectively output to the first optical fiber acousto-optic modulator 12 and the second optical fiber acousto-optic modulator 13, so that the purpose that the system clock signal, the clock signal of the first optical fiber acousto-optic modulator 12 and the clock signal of the second optical fiber acousto-optic modulator 13 are always kept uniform through the AOM driver is achieved.
In this embodiment, an external modulation input interface is further disposed on the AOM driver, a first delay adjustable module and a second delay adjustable module are further disposed in the AOM driver, the first delay adjustable module is respectively connected to the external modulation input interface and the first fiber acousto-optic modulator 12 to adjust a delay of an optical pulse generated by the first fiber acousto-optic modulator 12 with respect to an external modulation signal generated by the external modulation input interface, and the second delay adjustable module is respectively connected to the external modulation input interface and the second fiber acousto-optic modulator 13 to adjust a delay of an optical pulse generated by the second fiber acousto-optic modulator 13 with respect to an external modulation signal generated by the external modulation input interface (as shown in fig. 2).
In this way, by arranging the first delay adjustable module and the second delay adjustable module and connecting the first delay adjustable module and the second delay adjustable module with the first optical fiber acousto-optic modulator 12 and the second optical fiber acousto-optic modulator 13 respectively, the problem of inconsistent optical pulse delays of the two optical fiber acousto-optic modulators is solved, and the two-way delay is independently adjustable. The delay adjustable module is added after the modulation signal of each driver is input, the delay of the optical pulse of one optical fiber acousto-optic modulator relative to the external modulation signal is firstly tested, then the delay of the optical pulse of each optical fiber acousto-optic modulator relative to the external modulation signal is respectively adjusted, and finally the purpose of consistent optical pulse relative trigger signals of each optical fiber acousto-optic modulator can be achieved.
In the present embodiment, the rising time of the optical pulses generated by the first fiber acousto-optic modulator 12 and the second fiber acousto-optic modulator 13 is independently adjusted, so that the optical pulses generated by the first fiber acousto-optic modulator 12 and the second fiber acousto-optic modulator 13 slowly rise at the rising edge.
In this way, since the optical pulse has a problem of pulse distortion after amplification (as shown in fig. 3), in the present embodiment, the rising time of each optical pulse is adjusted so that each optical pulse rises slowly at the rising edge, and the buffering process at the rising edge of each optical pulse is implemented, so that the pulse distortion after the optical pulse amplification is reduced, and the quality of the output signal is ensured (as shown in fig. 4).
As shown in fig. 5, an acousto-optic cascade module for implementing the control method based on the dual AOM cascade structure includes a circuit module 2 and a light path module 1, the circuit module 2 and the light path module 1 are vertically arranged in layers, and a first optical fiber acousto-optic modulator 12 and a second optical fiber acousto-optic modulator 13 are symmetrically distributed in the light path module 1 (as shown in fig. 6);
the circuit module 2 processes the system clock signal to obtain two paths of radio frequency signals with the same clock, and outputs the two paths of radio frequency signals to the first optical fiber acousto-optic modulator 12 and the second optical fiber acousto-optic modulator 13 respectively, so as to realize the clock unification of the first optical fiber acousto-optic modulator 12 and the second optical fiber acousto-optic modulator 13.
In this way, the circuit module 2 and the light path module 1 in the acousto-optic cascade module are arranged in a vertical layered manner, so that the space occupied by the whole acousto-optic cascade module in the horizontal direction is greatly reduced, the miniaturization design of the whole acousto-optic cascade module is further realized, and meanwhile, the circuit module 2 and the light path module 1 are arranged in a layered manner, and the integrated module design of each part in the acousto-optic cascade module can also be realized; in addition, the first fiber acousto-optic modulator 12 and the second fiber acousto-optic modulator 13 are symmetrically distributed on two sides of the optical path module 1, so that optical fibers between the two AOMs can be conveniently coiled, meanwhile, the circuit module 2 is utilized to process system clock signals to obtain two paths of radio frequency signals with the same clock, the two paths of radio frequency signals are respectively output to the first fiber acousto-optic modulator 12 and the second fiber acousto-optic modulator 13, and the clock signals of the first fiber acousto-optic modulator 12 and the second fiber acousto-optic modulator 13 can be conveniently and uniformly controlled. Therefore, the volume of the acousto-optic cascade module is greatly reduced, and the clock signals of the two optical fiber acousto-optic modulators in the acousto-optic cascade module are unified.
As shown in fig. 7 to 8, in the present embodiment, the circuit module 2 includes a circuit mounting base 21, the optical path module 1 includes an optical path housing 11, the first optical fiber acousto-optic modulator 12 and the second optical fiber acousto-optic modulator 13 are both mounted on the optical path housing 11, a first through hole is opened at a position where the first optical fiber acousto-optic modulator 12 is mounted at the bottom of the optical path housing 11, a second through hole is opened at a position where the second optical fiber acousto-optic modulator 13 is mounted at the bottom of the optical path housing 11, a first heat dissipation block 14 is disposed at the first through hole, two ends of the first heat dissipation block 14 are respectively connected with the first optical fiber acousto-optic modulator 12 and the circuit mounting base 21, so that heat generated by the first optical fiber acousto-optic modulator 12 can be transmitted to the circuit mounting base 21 through the first heat dissipation block 14, a second heat dissipation block 15 is disposed at the second through hole, two ends of the second heat dissipation block 15 are respectively connected with the second optical fiber acousto-optic modulator 13 and the circuit mounting base 21, so that the heat generated by the second fiber acousto-optic modulator 13 can be transmitted to the circuit mounting base 21 through the second heat dissipation block 15.
Thus, in the working process, the first optical fiber acousto-optic modulator 12 and the second optical fiber acousto-optic modulator 13 can generate a large amount of heat, and the heat is not dissipated in time to easily damage the first optical fiber acousto-optic modulator 12 and the second optical fiber acousto-optic modulator 13, so in the scheme, the first heat dissipation block 14 is arranged at the first optical fiber acousto-optic modulator 12, and the second heat dissipation block 15 is arranged at the second optical fiber acousto-optic modulator 13, so that the heat generated at the first optical fiber acousto-optic modulator 12 and the second optical fiber acousto-optic modulator 13 can be timely transmitted to the first heat dissipation block 14 and the second heat dissipation block 15, and the heat transmitted to the first heat dissipation block 14 and the second heat dissipation block 15 is further transmitted to the metal bottom plate of the circuit mounting seat 21, thereby avoiding the heat from being accumulated at the first optical fiber acousto-optic modulator 12 and the second optical fiber acousto-optic modulator 13, and enabling the heat at the first optical fiber acousto-optic modulator 12 and the second optical fiber acousto-optic modulator 13 to be timely dissipated And the normal work of the first optical fiber acousto-optic modulator 12 and the second optical fiber acousto-optic modulator 13 is ensured.
In this embodiment, the first heat sink 14 and the second heat sink 15 are both heat sinks with T-shaped structures, the long sides of the T-shaped structures of the first heat sink 14 and the second heat sink 15 are respectively connected to the first fiber acousto-optic modulator 12 and the second fiber acousto-optic modulator 13, and the short sides of the T-shaped structures of the first heat sink 14 and the second heat sink 15 are respectively connected to the circuit mounting seat 21 at the corresponding position.
Like this, set up first radiating block 14 and second radiating block 15 to T type structure, and be connected first radiating block 14 and the long limit of second radiating block 15T type structure with first optic fibre acoustic-optical modulator 12 and second optic fibre acoustic-optical modulator 13, can make the radiating block have great area of contact with the optic fibre acoustic-optical modulator that corresponds the position like this, make the radiating block of the timely transmission of the heat of optic fibre acoustic-optical modulator through great area of contact for corresponding the position from this, the rethread radiating block transmits and gives off on circuit mount 21, the radiating block of T type structure can also effectual volume and the weight that reduces whole radiating block when guaranteeing the heat dissipation simultaneously.
In this embodiment, the long side of the T-shaped structure of the first heat sink 14 matches the size of the corresponding position of the first fiber acousto-optic modulator 12, the long side of the T-shaped structure of the second heat sink 15 matches the size of the corresponding position of the second fiber acousto-optic modulator 13, the short side of the T-shaped structure of the first heat sink 14 is fixedly connected to the circuit mount 21, and the short side of the T-shaped structure of the second heat sink 15 is fixedly connected to the circuit mount 21.
Therefore, the long edge size of the T-shaped structure of the radiating block is matched with the size of the corresponding position of the optical fiber acousto-optic modulator, so that the radiating block and the optical fiber acousto-optic modulator have the largest contact area, the radiating area of the optical fiber acousto-optic modulator can be increased, the radiating capacity is improved, the heat accumulation of the local area of the optical fiber acousto-optic modulator can be avoided, and the heat of each position of the optical fiber acousto-optic modulator can be uniformly and effectively radiated; meanwhile, the short edge of the T-shaped structure of the radiating block is connected with the circuit mounting seat through a screw, so that the radiating block and the circuit mounting seat 21 can be conveniently positioned and connected.
As shown in fig. 9, in this embodiment, the circuit module 2 includes a first rf module 24 and a second rf module 25, a first working chamber and a second working chamber are disposed on the circuit mounting base 21, the first working chamber and the second working chamber are respectively covered with a first shielding plate 22 and a second shielding plate 23, the first rf module 24 is disposed in the first working chamber, and the second rf module 25 is disposed in the second working chamber.
Therefore, the first radio frequency module 24 and the second radio frequency module 25 in the circuit module 2 are designed to be separated from each other, and each working chamber is covered with the shielding plate, so that crosstalk among radio frequency signals in different working chambers can be effectively inhibited, and an anti-interference effect is achieved.
As shown in fig. 10 and 11, in this embodiment, a third through hole is opened at the bottom of the first working chamber, a first mounting plate 26 installed outside the circuit mounting base 21 is detachably connected to the third through hole, so that after the first mounting plate 26 is detached from the third through hole, the signal of the first rf module 24 can be adjusted in a delayed manner from the third through hole, a fourth through hole is opened at the bottom of the second working chamber, a second mounting plate 27 installed outside the circuit mounting base 21 is detachably connected to the fourth through hole, so that after the second mounting plate 27 is detached from the fourth through hole, the signal of the second rf module 25 can be adjusted in a delayed manner from the fourth through hole.
Thus, by arranging the first mounting plate 26 and the second mounting plate 27, when the radio frequency signals of the first radio frequency module 24 and the second radio frequency module 25 need to be adjusted in a delayed manner, the first mounting plate 26 and the second mounting plate 27 at corresponding positions are detached, so that the first radio frequency module 24 and the second radio frequency module 25 are respectively exposed through the third through hole and the fourth through hole, and the signal delay adjustment can be conveniently performed on the first radio frequency module 24 and the second radio frequency module 25.
Compared with the prior art, the invention has the following advantages:
1. the high-frequency AOM cascade design ensures high extinction ratio, large dynamic range and flexible frequency shift range, and is very suitable for weak signal detection;
2. the pulse signal width can be defined by a user, the minimum time can reach 10ns, and the time domain resolution can be effectively improved;
3. the design of clock external input is convenient for synchronizing with a system clock, and the system is ensured to have high phase consistency;
4. the double-path delay is adjustable, the utilization rate of optical pulse is improved, and the optical fiber delay optical fiber is flexibly suitable for different optical fiber systems;
5. the design of adjustable light pulse leading edge can effectively reduce the pulse distortion generated by laser amplification.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the technical solutions, and those skilled in the art should understand that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all that should be covered by the claims of the present invention.
Claims (8)
1. A control method based on a double-AOM cascade structure is characterized in that the double-AOM cascade structure of the control method comprises a first optical fiber acousto-optic modulator and a second optical fiber acousto-optic modulator, the control method obtains two paths of radio frequency signals with consistent clocks by processing system clock signals, and the two paths of radio frequency signals are respectively output to the first optical fiber acousto-optic modulator and the second optical fiber acousto-optic modulator, so that the clock unification of the first optical fiber acousto-optic modulator and the second optical fiber acousto-optic modulator is realized;
the optical fiber acousto-optic modulator further comprises an AOM driver, an external modulation input interface is further arranged on the AOM driver, a first delay adjustable module and a second delay adjustable module are further arranged in the AOM driver, the first delay adjustable module is respectively connected with the external modulation input interface and the first optical fiber acousto-optic modulator so as to adjust the delay of optical pulses generated by the first optical fiber acousto-optic modulator relative to external modulation signals generated by the external modulation input interface, and the second delay adjustable module is respectively connected with the external modulation input interface and the second optical fiber acousto-optic modulator so as to adjust the delay of the optical pulses generated by the second optical fiber acousto-optic modulator relative to the external modulation signals generated by the external modulation input interface;
a clock input interface, a first radio frequency output interface and a second radio frequency output interface are arranged on the AOM driver, a phase-locked loop or a direct digital frequency synthesizer is arranged in the AOM driver, the clock input interface is used for accessing a system clock, the first radio frequency output interface is used for being connected with the first optical fiber acousto-optic modulator, and the second radio frequency output interface is used for being connected with the second optical fiber acousto-optic modulator;
and after entering the AOM driver through the clock input interface, the system clock generates two paths of radio frequency signals with consistent clocks through a phase-locked loop or a direct digital frequency synthesizer, wherein one path of radio frequency signal is output to the first optical fiber acousto-optic modulator through a first radio frequency output interface so as to drive the first optical fiber acousto-optic modulator, and the other path of radio frequency signal is output to the second optical fiber acousto-optic modulator through a second radio frequency output interface so as to drive the second optical fiber acousto-optic modulator.
2. The dual-AOM cascade structure-based control method according to claim 1, wherein the rise times of the optical pulses generated by the first fiber acousto-optic modulator and the second fiber acousto-optic modulator are independently adjusted so that the optical pulses generated by the first fiber acousto-optic modulator and the second fiber acousto-optic modulator slowly rise at a rising edge.
3. An acousto-optic cascade module for implementing the control method based on the dual-AOM cascade structure according to claim 1, wherein the acousto-optic cascade module comprises a circuit module and an optical path module, the circuit module and the optical path module are vertically arranged in layers, and the first fiber acousto-optic modulator and the second fiber acousto-optic modulator are symmetrically distributed in the optical path module;
the circuit module processes the system clock signal to obtain two paths of radio frequency signals with the same clock, and the two paths of radio frequency signals are respectively output to the first optical fiber acousto-optic modulator and the second optical fiber acousto-optic modulator, so that the clock unification of the first optical fiber acousto-optic modulator and the second optical fiber acousto-optic modulator is realized.
4. The acousto-optic cascade module based on the dual-AOM cascade structure according to claim 3, wherein the circuit module includes a circuit mounting seat, the optical path module includes an optical path housing, the first optical fiber acousto-optic modulator and the second optical fiber acousto-optic modulator are both mounted on the optical path housing, a first through hole is formed at a position of the optical path housing where the first optical fiber acousto-optic modulator is mounted, a second through hole is formed at a position of the optical path housing where the second optical fiber acousto-optic modulator is mounted, a first heat dissipation block is disposed at the first through hole, two ends of the first heat dissipation block are respectively connected with the first optical fiber acousto-optic modulator and the circuit mounting seat, so that heat generated by the first optical fiber acousto-optic modulator can be transferred to the circuit mounting seat through the first heat dissipation block, and a second heat dissipation block is arranged at the second through hole, and two ends of the second heat dissipation block are respectively connected with the second optical fiber acousto-optic modulator and the circuit mounting seat, so that heat generated by the second optical fiber acousto-optic modulator can be transferred to the circuit mounting seat through the second heat dissipation block.
5. The acousto-optic cascade module based on the dual-AOM cascade structure of claim 4, wherein the first heat sink and the second heat sink are both T-shaped heat sinks, and the long sides of the T-shaped structures of the first heat sink and the second heat sink are respectively connected to the first fiber acousto-optic modulator and the second fiber acousto-optic modulator, and the short sides of the T-shaped structures of the first heat sink and the second heat sink are respectively connected to the circuit mounting seats at corresponding positions.
6. The acousto-optic cascade module based on dual-AOM cascade structure of claim 5, wherein the dimension of the long side of the first heat sink T-shaped structure matches with the dimension of the corresponding position of the first fiber acousto-optic modulator, the dimension of the long side of the second heat sink T-shaped structure matches with the dimension of the corresponding position of the second fiber acousto-optic modulator, the short side of the first heat sink T-shaped structure is fixedly connected with the circuit mounting base, and the short side of the second heat sink T-shaped structure is fixedly connected with the circuit mounting base.
7. The acousto-optic cascade module based on the dual-AOM cascade structure of claim 4, wherein the circuit module comprises a first RF module and a second RF module, a first working chamber and a second working chamber are disposed on the circuit mounting base, the first working chamber and the second working chamber are respectively covered with a first shielding plate and a second shielding plate, the first RF module is installed in the first working chamber, and the second RF module is installed in the second working chamber.
8. The acousto-optic cascade module based on dual-AOM cascade structure of claim 7, wherein a third through hole is opened at the bottom of the first working chamber, a first mounting plate installed outside the circuit mounting seat is detachably connected to the third through hole, so that the signal of the first rf module can be adjusted in a delayed manner from the third through hole after the first mounting plate is detached from the third through hole, a fourth through hole is opened at the bottom of the second working chamber, and a second mounting plate installed outside the circuit mounting seat is detachably connected to the fourth through hole, so that the signal of the second rf module can be adjusted in a delayed manner from the fourth through hole after the second mounting plate is detached from the fourth through hole.
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