CN116667106A - Terahertz source generation system - Google Patents
Terahertz source generation system Download PDFInfo
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- CN116667106A CN116667106A CN202310531799.6A CN202310531799A CN116667106A CN 116667106 A CN116667106 A CN 116667106A CN 202310531799 A CN202310531799 A CN 202310531799A CN 116667106 A CN116667106 A CN 116667106A
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- optical carrier
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
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Abstract
The present disclosure provides a terahertz source generating system, comprising: the laser source comprises a first laser and a second laser, wherein the first laser is used for generating a first optical carrier, and the second laser is used for generating a second optical carrier; the terahertz modulation module is arranged on the output optical path of the second laser and used for generating a radio frequency microwave signal and modulating the radio frequency microwave signal onto a second optical carrier; the terahertz detection module is arranged on the output light paths of the first laser and the terahertz modulation module and is used for combining and beating a second optical carrier wave with a radio frequency microwave signal with the first optical carrier wave to generate a terahertz microwave signal; the feedback module is arranged on the output optical paths of the first laser and the second laser and is used for feeding back the first optical carrier to the first laser and feeding back the second optical carrier to the second laser, so that the first laser and the second laser adjust the wavelengths of the output first optical carrier and the second optical carrier.
Description
Technical Field
The disclosure relates to the technical field of optical communication and the technical field of microwaves, in particular to a terahertz source generation system.
Background
With the development of terahertz wave detection technology, terahertz waves are receiving more and more attention from researchers. Terahertz waves have been widely used in the fields of wireless communication, medical biology, security detection, and the like due to the advantages of low photon energy, high penetration force, high resolution, and the like. However, as the requirements of wireless communication technology on transmission speed are higher and higher, the frequency requirements on electromagnetic waves are also higher and higher. Therefore, it is important to produce a high quality terahertz source. Meanwhile, the microwave photon technology has the advantages of low transmission loss, strong electromagnetic interference resistance, large working bandwidth and the like, so that the microwave photon technology can be utilized to convert a laser signal into a terahertz signal, and a high-quality terahertz source is generated. At present, a plurality of methods for generating terahertz by utilizing a photonics technology are available, but generally only terahertz signals with single frequency are generated, the terahertz signals cannot be tuned, the development of a terahertz imaging or communication system is severely restricted, the system is often complex in structure, and the volume power consumption is larger.
Disclosure of Invention
First, the technical problem to be solved
In view of the above, the present disclosure provides a terahertz source generating system to at least partially solve the problems of single frequency, inability to tune, complex system configuration and large volume power consumption of the terahertz signals generated at present.
(II) technical scheme
The present disclosure provides a terahertz source generating system, comprising: a laser source comprising a first laser for generating a first optical carrier and a second laser for generating a second optical carrier; the terahertz modulation module is arranged on the output optical path of the second laser and used for generating a radio frequency microwave signal and modulating the radio frequency microwave signal onto the second optical carrier; the terahertz detection module is arranged on the output optical paths of the first laser and the terahertz modulation module and is used for combining and beating the second optical carrier wave with the radio frequency microwave signal with the first optical carrier wave to generate a terahertz microwave signal; and the feedback module is arranged on the output optical paths of the first laser and the second laser and is used for feeding back a first optical carrier to the first laser and feeding back a second optical carrier to the second laser, so that the first laser and the second laser adjust the wavelength of the output first optical carrier and the wavelength of the second optical carrier.
According to an embodiment of the present disclosure, the terahertz source generating system further includes: and the controller is connected with the first laser, the second laser and the terahertz modulation module and is used for adjusting the frequencies of the first optical carrier, the second optical carrier and the radio frequency microwave signal to realize the frequency stepping regulation and control of the terahertz microwave signal.
According to an embodiment of the disclosure, the feedback module comprises a first feedback module and a second feedback module, wherein the first feedback module comprises a first F-P etalon, a first feedback sub-circuit, and a first beam splitter; the first F-P etalon is connected with the first laser and is used for filtering the first optical carrier; the first beam splitter is connected with the first F-P etalon and is used for dividing a first part of first optical carrier waves from the first optical carrier waves passing through the first F-P etalon to the first feedback sub-circuit and outputting a second part of first optical carrier waves to the terahertz detection module; a first feedback sub-circuit is connected with the first beam splitter and the first laser and is used for feeding back the first part of the first optical carrier to the first laser; the second feedback module comprises a second F-P etalon, a second feedback sub-circuit and a second beam splitter; the second F-P etalon is connected with the second laser and is used for filtering the second optical carrier; the second beam splitter is connected with the second F-P etalon and is used for splitting a first part of second optical carrier from the second optical carrier passing through the second F-P etalon to the second feedback sub-circuit and splitting a second part of second optical carrier to output to the terahertz modulation module; and the second feedback sub-circuit is connected with the second beam splitter and the second laser and is used for feeding back the first part of the second optical carrier to the second laser.
According to an embodiment of the disclosure, the controller is connected to the first feedback sub-circuit and the second feedback sub-circuit for generating a first adjustment signal based on the first feedback sub-circuit, adjusting the first laser, and generating a second adjustment signal based on the second feedback sub-circuit, adjusting the second laser.
According to an embodiment of the disclosure, the first and second splitters split the first and second optical carriers to a power of 1:99.
According to an embodiment of the present disclosure, the terahertz modulation module includes: the modulator is connected with the feedback module and the terahertz detection module and is used for modulating the radio frequency microwave signal onto the second optical carrier; and the radio frequency microwave source is connected with the modulator and is used for providing the radio frequency microwave signal.
According to an embodiment of the present disclosure, the modulator operates at a carrier-suppressed single sideband operating point.
According to an embodiment of the present disclosure, the terahertz detection module includes: the beam combiner is connected with the terahertz modulation module and the feedback module and is used for combining the second optical carrier wave with the radio frequency microwave signal with the first optical carrier wave; and the detector is connected with the beam combiner and is used for beating the second optical carrier wave with the radio frequency microwave signal and the first optical carrier wave.
According to the embodiment of the disclosure, the detector is a terahertz frequency band ultra-wideband photoelectric detector.
According to an embodiment of the present disclosure, the wavelength difference λ of the first optical carrier and the second optical carrier 1 -λ 0 Is a terahertz frequency band, wherein lambda 0 Lambda is the wavelength of the first optical carrier 1 Is the wavelength of the second optical carrier.
(III) beneficial effects
According to the terahertz source generation system, the terahertz source is generated in a beat frequency mode of the two lasers, the system structure is simple and easy to implement, and the two lasers are provided with the feedback modules, so that stable and adjustable optical carriers can be output; the frequency of the first optical carrier wave, the frequency of the second optical carrier wave and the frequency of the radio frequency microwave signal are changed by adopting the controller, so that the frequency stepping regulation and control of the terahertz microwave signal are realized, and the generated terahertz source is non-single in frequency point, stable in signal and adjustable in frequency in real time; the modulator works at a single sideband working point of carrier suppression, only generates a required sideband, has pure spectrum, avoids the use of an optical filter, and has simpler system structure and better tuning property.
Drawings
For a more complete understanding of the present disclosure and the advantages thereof, reference is now made to the following descriptions taken in conjunction with the accompanying drawings, in which:
FIG. 1 schematically illustrates a schematic diagram of a terahertz source generating system provided by an embodiment of the present disclosure;
FIG. 2 schematically illustrates a spectral diagram of a combined signal provided by an embodiment of the present disclosure;
fig. 3 schematically illustrates a spectrum diagram of a terahertz signal obtained by beat frequency provided by an embodiment of the present disclosure.
Reference numerals illustrate:
1-a first laser;
2-a first F-P etalon;
3-a first feedback sub-circuit;
4-a first beam splitter;
5-a second laser;
6-a second F-P etalon;
7-a second feedback sub-circuit;
8-a second beam splitter;
9-a radio frequency microwave source;
a 10-modulator;
11-a beam combiner;
12-detector.
Detailed Description
Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings. It should be understood that the description is only exemplary and is not intended to limit the scope of the present disclosure. In the following detailed description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of the embodiments of the present disclosure. It may be evident, however, that one or more embodiments may be practiced without these specific details. In addition, in the following description, descriptions of well-known structures and techniques are omitted so as not to unnecessarily obscure the concepts of the present disclosure.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. The terms "comprises," "comprising," and/or the like, as used herein, specify the presence of stated features, steps, operations, and/or components, but do not preclude the presence or addition of one or more other features, steps, operations, or components.
All terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art unless otherwise defined. It should be noted that the terms used herein should be construed to have meanings consistent with the context of the present specification and should not be construed in an idealized or overly formal manner.
Fig. 1 schematically illustrates a schematic diagram of a terahertz source generating system provided by an embodiment of the present disclosure.
As shown in fig. 1, a terahertz source generating system provided in an embodiment of the present disclosure includes: the first laser 1, the second laser 5, the radio frequency microwave source 9, the modulator 10, the beam combiner 11, the detector 12 and a controller (not shown).
Wherein the laser source comprises a first laser 1 and a second laser 5, the first laser 1 is used for generating a wavelength lambda 0 Frequency f 0 The first optical carrier wave of =193.1 THz, the second laser 5 is used to generate a wavelength λ 1 Frequency f 1 Second optical carrier of=193.3 THz, wavelength λ of first optical carrier 0 And a wavelength lambda of the second optical carrier 1 For the communication band, the wavelength difference lambda 1 -λ 0 Is the terahertz frequency band. According to the embodiment of the disclosure, the terahertz source is generated in a beat frequency mode of two lasers, so that the system is simple in structure and easy to implement.
The terahertz modulation module is arranged on an output light path of the second laser 5 and comprises a radio frequency microwave source 9 and a modulator 10, and the radio frequency microwave source 9 is connected with the modulator 10 and is used for generating a radio frequency microwave signal with the frequency of f=25 GHz; the modulator 10 is connected to the terahertz detection module and the feedback module for modulating the radio frequency microwave signal onto the second optical carrier to formFrequency f 1 +f=193.3thz+25 ghz. The terahertz modulation module is based on a microwave photon technology, and can modulate and transmit a radio frequency microwave signal to one path of optical carrier, so that transmission loss is reduced, electromagnetic interference resistance of the signal is enhanced, and working bandwidth of the signal is increased.
In the embodiment of the disclosure, the modulator 10 is a dual parallel mach-zehnder modulator, works at a single sideband operation point of carrier suppression, and transmits in an optical path, and can only generate a required sideband, so that the spectrum is pure, and the use of an optical filter is avoided, thereby enabling the system structure to be simpler and the tuning to be better.
The terahertz detection module is arranged on the output light path of the first laser 1 and the terahertz modulation module and comprises a beam combiner 11 and a detector 12, wherein the beam combiner 11 is connected with the terahertz modulation module and the feedback module and is used for combining a first optical carrier with a second optical carrier modulated by a radio frequency signal to form a path of optical signal; the detector 12 is a terahertz frequency band ultra-wideband photoelectric detector, and is connected with the beam combiner 11, and the second optical carrier wave and the first optical carrier wave with the radio frequency microwave signals are beaten by the wavelength difference of the first optical carrier wave and the second optical carrier wave to form a frequency f 1 -f 0 Terahertz microwave signal of + -f. And the terahertz detection module is used for beam combination and beat frequency, so that a stable, real-time and accurately adjustable terahertz source can be finally obtained.
As shown in fig. 2, the spectrum of the signal obtained by combining the beams provided by the embodiment of the disclosure has a frequency f 0 First optical carrier and frequency of 193.1THz f 1 A spectral diagram of the signal obtained after the second optical carrier with the radiofrequency microwave signal having +f=193.3thz+25 ghz has passed through the combiner 11.
As shown in fig. 3, a spectrum diagram of a terahertz signal obtained from a beat frequency provided in an embodiment of the present disclosure has a frequency f for passing through the beam combiner 11 0 First optical carrier and frequency of 193.1THz f 1 +f=193.3thz+25 GHz second optical carrier beat frequency with RF microwave signal to form frequency f 1 -f 0 Terahertz microwave signal of + -f=193.3thz+25ghz-193.3thz=225 GHz.
Further, the terahertz source generating system provided by the embodiment of the disclosure includes a controller connected to the first laser 1, the second laser 5 and the terahertz modulating module, and configured to adjust frequencies of the first optical carrier, the second optical carrier and the radio frequency microwave signal, and implement frequency stepping regulation and control of the terahertz microwave signal, so that the generated terahertz source is not a single frequency point, stable in signal and adjustable in frequency in real time.
In some embodiments, referring to fig. 1, the terahertz source generating system of the disclosure further includes a feedback module, disposed on output optical paths of the first laser and the second laser, configured to feed back the first optical carrier to the first laser and feed back the second optical carrier to the second laser, so that the first laser and the second laser adjust wavelengths of the output first optical carrier and the second optical carrier, thereby realizing stable control of the wavelengths.
Specifically, the feedback module comprises a first feedback module and a second feedback module, wherein the first feedback module comprises a first F-P etalon 2, a first feedback sub-circuit 3 and a first beam splitter 4; the first F-P etalon 2 is connected with the first laser 1 and is used for filtering the first optical carrier; the first beam splitter 4 is connected to the first F-P etalon 2, and is configured to split the first optical carrier passing through the first F-P etalon 2 into a power of 1:99, and a second part of the first optical carrier, wherein the first part of the first optical carrier is given to the first feedback sub-circuit 3, and the second part of the first optical carrier is output to the terahertz detection module; the first feedback sub-circuit 3 is connected to the first beam splitter 4 and the first laser 1 and is used for feeding back a first part of the first optical carrier to the first laser 1; the second feedback module comprises a second F-P etalon 6, a second feedback sub-circuit 7 and a second beam splitter 8; the second F-P etalon 6 is connected to the second laser 5 for filtering the second optical carrier; the second beam splitter 8 is connected to the second F-P etalon 6, and is configured to split the second optical carrier passing through the second F-P etalon 6 into a power of 1:99, and a second portion of the second optical carrier, the first portion of the second optical carrier being provided to the second feedback sub-circuit 7, the second portion of the second optical carrier being output to the terahertz modulation module; the second feedback sub-circuit 7 is connected to the second beam splitter 8 and the second laser 5 for feeding back the first part of the second optical carrier to the second laser 5.
In particular, the controller is connected to the first feedback sub-circuit 3 and the second feedback sub-circuit 7 for generating a first adjustment signal based on the first feedback sub-circuit 3, adjusting the first laser 1, and for generating a second adjustment signal based on the second feedback sub-circuit 7, adjusting the second laser 5. Under the action of the feedback module, the first optical carrier and the second optical carrier which are stable and adjustable can be output through the controller.
The first feedback sub-circuit 3 is electrically connected to the first laser 1, the second feedback sub-circuit 7 is electrically connected to the second laser 5, and the rf microwave source 9 is electrically connected to the modulator 10. The optical path layout of the system is flexible and activated by utilizing the flexibility of the optical fibers, the optical path is simple, the propagation loss of light is reduced, and the system is more stable.
According to the laser wavelength stabilizing device, the feedback module is designed, under the action of the controller, the first feedback sub-circuit and the second feedback sub-circuit are used for generating the adjusting signals, and the first laser and the second laser are adjusted, so that stable control of the wavelength is realized. In addition, the frequency of the first optical carrier, the second optical carrier and the radio frequency microwave signal is changed by the controller, so that the terahertz microwave signal can be adjustable in implementation and is not single in frequency. The modulator of the terahertz modulation module works at a carrier suppression single-sideband working point, only generates required sidebands, has pure spectrum, simplifies the structure of the system and has better tunability.
Those skilled in the art will appreciate that the features recited in the various embodiments of the disclosure and/or in the claims may be provided in a variety of combinations and/or combinations, even if such combinations or combinations are not explicitly recited in the disclosure. In particular, the features recited in the various embodiments of the present disclosure and/or the claims may be variously combined and/or combined without departing from the spirit and teachings of the present disclosure. All such combinations and/or combinations fall within the scope of the present disclosure.
While the present disclosure has been shown and described with reference to certain exemplary embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present disclosure as defined by the appended claims and their equivalents. The scope of the disclosure should, therefore, not be limited to the above-described embodiments, but should be determined not only by the following claims, but also by the equivalents of the following claims.
Claims (10)
1. A terahertz source generating system, characterized by comprising:
a laser source comprising a first laser for generating a first optical carrier and a second laser for generating a second optical carrier;
the terahertz modulation module is arranged on the output optical path of the second laser and used for generating a radio frequency microwave signal and modulating the radio frequency microwave signal onto the second optical carrier;
the terahertz detection module is arranged on the output optical paths of the first laser and the terahertz modulation module and is used for combining and beating the second optical carrier wave with the radio frequency microwave signal with the first optical carrier wave to generate a terahertz microwave signal;
and the feedback module is arranged on the output optical paths of the first laser and the second laser and is used for feeding back a first optical carrier to the first laser and feeding back a second optical carrier to the second laser, so that the first laser and the second laser adjust the wavelength of the output first optical carrier and the wavelength of the second optical carrier.
2. The terahertz source generating system according to claim 1, further comprising:
and the controller is connected with the first laser, the second laser and the terahertz modulation module and is used for adjusting the frequencies of the first optical carrier, the second optical carrier and the radio frequency microwave signal to realize the frequency stepping regulation and control of the terahertz microwave signal.
3. The terahertz source generating system according to claim 2, wherein,
the feedback module comprises a first feedback module and a second feedback module, wherein,
the first feedback module comprises a first F-P etalon, a first feedback sub-circuit and a first beam splitter;
the first F-P etalon is connected with the first laser and is used for filtering the first optical carrier;
the first beam splitter is connected with the first F-P etalon and is used for dividing a first part of first optical carrier waves from the first optical carrier waves passing through the first F-P etalon to the first feedback sub-circuit and outputting a second part of first optical carrier waves to the terahertz detection module;
a first feedback sub-circuit is connected with the first beam splitter and the first laser and is used for feeding back the first part of the first optical carrier to the first laser;
the second feedback module comprises a second F-P etalon, a second feedback sub-circuit and a second beam splitter;
the second F-P etalon is connected with the second laser and is used for filtering the second optical carrier;
the second beam splitter is connected with the second F-P etalon and is used for splitting a first part of second optical carrier from the second optical carrier passing through the second F-P etalon to the second feedback sub-circuit and splitting a second part of second optical carrier to output to the terahertz modulation module;
and the second feedback sub-circuit is connected with the second beam splitter and the second laser and is used for feeding back the first part of the second optical carrier to the second laser.
4. The terahertz source generating system according to claim 3, wherein the controller connects the first feedback sub-circuit and the second feedback sub-circuit for generating a first adjustment signal based on the first feedback sub-circuit, adjusting the first laser, and generating a second adjustment signal based on the second feedback sub-circuit, adjusting the second laser.
5. The terahertz source generating system according to claim 3, wherein,
the first beam splitter and the second beam splitter split the first optical carrier and the second optical carrier into power 1:99.
6. the terahertz source generating system according to claim 1, wherein the terahertz modulation module includes:
the modulator is connected with the feedback module and the terahertz detection module and is used for modulating the radio frequency microwave signal onto the second optical carrier;
and the radio frequency microwave source is connected with the modulator and is used for providing the radio frequency microwave signal.
7. The terahertz source generating system according to claim 6, wherein the modulator operates at a carrier-suppressed single-sideband operating point.
8. The terahertz source generating system according to claim 1, wherein the terahertz detection module includes:
the beam combiner is connected with the terahertz modulation module and the feedback module and is used for combining the second optical carrier wave with the radio frequency microwave signal with the first optical carrier wave;
and the detector is connected with the beam combiner and is used for beating the second optical carrier wave with the radio frequency microwave signal and the first optical carrier wave.
9. The terahertz source generating system according to claim 8, wherein the detector is a terahertz-band ultra-wideband photodetector.
10. The terahertz source generating system according to claim 1, wherein a wavelength difference λ of the first optical carrier and the second optical carrier 1 -λ 0 Is a terahertz frequency band, wherein lambda 0 Lambda is the wavelength of the first optical carrier 1 Is the wavelength of the second optical carrier.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310531799.6A CN116667106A (en) | 2023-05-11 | 2023-05-11 | Terahertz source generation system |
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| CN202310531799.6A CN116667106A (en) | 2023-05-11 | 2023-05-11 | Terahertz source generation system |
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