CN113114375B - Photon terahertz communication method and device - Google Patents
Photon terahertz communication method and device Download PDFInfo
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- CN113114375B CN113114375B CN202110479693.7A CN202110479693A CN113114375B CN 113114375 B CN113114375 B CN 113114375B CN 202110479693 A CN202110479693 A CN 202110479693A CN 113114375 B CN113114375 B CN 113114375B
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Abstract
The embodiment of the invention discloses a photon terahertz communication method and device, relating to the technical field of optical communication. The invention includes: the optical transmitter (11) is used for generating dual-frequency light waves and carrying out data modulation on the generated dual-frequency light waves to obtain dual-frequency optical signals; a photodetector (12) for performing photoelectric conversion on the dual-frequency optical signal, generating a terahertz wave through beat frequency processing, and extracting a target terahertz signal from the obtained terahertz wave; and the wireless transceiver (13) is used for completing wireless transceiving, detection and received signal processing of the target terahertz signal. The method is suitable for eliminating the SSBI in the photon terahertz communication based on incoherent detection.
Description
Technical Field
The invention relates to the technical field of optical communication, in particular to a photon terahertz communication method and device.
Background
Terahertz waves are one of core wave bands of 6G, and are a necessary foundation for meeting the communication requirements of future wireless communication on super-bandwidth, large capacity and full spectrum. In a photonic terahertz communication system, a mach-zehnder modulator (MZM) is simple to operate and lower in cost than an IQ modulator. In addition, terahertz signals generated based on MZM modulation can also complete signal detection through a low-cost envelope detection mode, so the MZM has become one of the most commonly used modulators in the electro-optical conversion process. However, when signal detection is performed by using square law, a terahertz signal generated by MZM modulation usually generates inter-signal beat crosstalk (SSBI). To achieve high spectral efficiency, the system typically does not reserve a frequency domain guard interval (or uses a very small frequency domain guard interval), where SSBI overlaps the target signal in the spectrum, which significantly degrades the receive sensitivity performance of the system.
In the prior art, several ways of eliminating the effect of SSBI have been developed, one of which is based on a compensation way, a special technical means (requiring additional optoelectronic devices and corresponding signal post-processing techniques) is adopted at the receiving end to reconstruct the SSBI, and then the reconstructed SSBI component is subtracted from the overall signal containing the SSBI, so that a pure target signal can be recovered. And secondly, under the condition of meeting the minimum phase, the Kramers-Kronig algorithm is adopted to directly reconstruct the single sideband vector signal before square law detection at the receiving end, so that the influence is caused. Third, through special signal processing of the sending end, the signal directly does not have SSBI after detection, for example, the direct detection without SSBI is realized by using methods such as Hilbert transform and Cartesian coordinate to polar coordinate transformation and the like at the sending end. With respect to the above prior art, there are mainly the following drawbacks: 1) the complexity of a system DSP is increased and corresponding signal processing delay is introduced no matter the signal is preprocessed at a sending end or the signal is post-processed at a receiving end; 2) the use of additional optoelectronic devices reduces the compatibility and scalability of the system and, in addition, significantly increases the deployment cost of the system.
Disclosure of Invention
The embodiment of the invention provides a photon terahertz communication method and device, wherein the generated terahertz signal does not generate SSBI during envelope detection, and the device has the characteristics of simple structure, strong compatibility and low deployment cost.
In order to achieve the above purpose, the embodiment of the invention adopts the following technical scheme:
in a first aspect, an embodiment of the present invention provides a method, including:
s1, generating a dual-frequency light wave;
s2, carrying out data modulation on the generated double-frequency light wave to obtain a double-frequency light signal;
s3, performing photoelectric conversion on the dual-frequency optical signal, generating terahertz waves through beat frequency processing, and extracting a target terahertz signal from the obtained terahertz waves;
and S4, sending the target terahertz signal to a receiving end through a terahertz antenna.
In a second aspect, an embodiment of the present invention provides a terahertz communication apparatus, including:
an optical transmitter (11), a photodetector (12) and a wireless transceiver (13); the optical transmitter (11) is used for generating dual-frequency light waves and carrying out data modulation on the generated dual-frequency light waves to obtain dual-frequency optical signals; a photodetector (12) for performing photoelectric conversion on the dual-frequency optical signal, generating a terahertz wave through beat frequency processing, and extracting a target terahertz signal from the obtained terahertz wave; and the wireless transceiver (13) is used for completing the wireless transceiving, detection by detection and signal processing of the target terahertz signal.
According to the photon terahertz communication method and device provided by the embodiment of the invention, the terahertz signal is generated by utilizing the heterodyne beat frequency of the two light waves modulated by the dual-drive MZM, the point-to-point high-speed communication of the terahertz wave with the carrier frequency of hundreds of GHz or above can be realized, and as no additional photoelectric equipment or unnecessary complex digital signal processing technology is introduced, the method and device have the characteristics of simple structure, strong compatibility and low deployment cost; and the frequency of the terahertz signal generated by the heterodyne beat frequency of the two beams of light has good tunability, and the terahertz signal can be dynamically adapted to terahertz communication systems with various frequency bands. Electro-optic modulation is completed based on the dual-drive MZM in the preset bias interval, so that SSBI cannot be generated in envelope detection of the generated terahertz signal, and therefore the receiving sensitivity of the terahertz communication system can be improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic diagram of a photonic terahertz communication system module without SSBI and a signal transmission method according to an embodiment of the present invention;
FIG. 2 is a detailed schematic diagram of a structure of a photonic terahertz communication system without SSBI according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a dual-wavelength light source module according to an embodiment of the present invention;
fig. 4 is another schematic structural diagram of a dual-wavelength light source module according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a modulator driving signal and a DC bias voltage setting provided by an embodiment of the present invention;
fig. 6 is a graph showing the relationship between the coefficients of the first and second order terms of the receiving end recovery signal and the dc bias voltage difference applied to the upper and lower arms of the dual-drive MZM according to the embodiment of the present invention;
fig. 7 is a relationship curve between the error vector magnitude of the 16QAM signals recovered by the receiving end and the dc bias voltage difference applied to the upper arm and the lower arm of the dual-drive MZM according to the embodiment of the present invention;
fig. 8 is a constellation diagram for recovering a 16QAM signal at a receiving end according to an embodiment of the present invention;
fig. 9 is a schematic diagram of a method flow provided by the embodiment of the invention.
The reference symbols in the drawings denote: the device comprises an optical transmitter (11), a dual-wavelength light source module (110), a dual-drive MZM (111), a sending signal processing module (112), a photoelectric detector (12), a wireless transceiver (13), a band-pass filter (130), a transmitting horn antenna (131), a receiving horn antenna (132), an envelope detector (133) and a receiving signal processing module (134).
Detailed Description
In order to make the technical solutions of the present invention better understood, the present invention is further described in detail with reference to the accompanying drawings and the detailed description below. Reference will now be made in detail to the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention. As used herein, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. It will be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may also be present. Further, "connected" or "coupled" as used herein may include wirelessly connected or coupled. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items. It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
Aiming at the defects of the prior art, the main design idea of the embodiment is as follows: the double-drive MZM is controlled to work under a specific direct current bias condition, SSBI does not exist in terahertz signals generated by double-frequency optical wave beat frequency with modulation signals after square law detection, and under the condition that extra photoelectric equipment and a complex signal processing technology are not relied on, the double-drive MZM is controlled to work in a preset bias interval, so that a photon terahertz communication system without crosstalk can be realized, the complexity and the deployment cost of the system are remarkably reduced, and the construction of the real-time photon terahertz communication system is facilitated.
An embodiment of the present invention provides a photonic terahertz communication method, as shown in fig. 9, including:
and S1, generating the dual-frequency light wave.
And S2, carrying out data modulation on the generated dual-frequency optical wave to obtain a dual-frequency optical signal.
And S3, performing photoelectric conversion on the dual-frequency optical signal, generating terahertz waves through beat frequency processing, and extracting a target terahertz signal from the obtained terahertz waves.
And S4, sending the target terahertz signal to a receiving end through a terahertz antenna.
The photonic terahertz communication device in this embodiment can be configured no matter at the transmitting end or at the receiving end, because the division of the transmitting end/the receiving end is distinguished according to the direction of data transmission, a terminal device equipped with the photonic terahertz communication device in this embodiment can be used as the "transmitting end" when data needs to be transmitted, and can be used as the "receiving end" when data is received.
In this embodiment, step S1 includes: and generating dual-frequency optical waves through a dual-wavelength light source module (110), wherein the dual-frequency optical waves comprise a first optical wave and a second optical wave, and the frequency difference between the first optical wave and the second optical wave is equal to the frequency of the target terahertz signal.
Specifically, the dual-wavelength light source module (110) generates dual-frequency light waves, wherein the light waves output by the dual-wavelength light source module (110) are light waves
Wherein, P c1 、ω c1 And
respectively representing the output optical power, the central angular frequency and the phase noise of the first path of light wave, P c2 、ω c2 And
respectively representing output optical power, central angle frequency and phase noise of a second path of optical wave, c representing optical wave, t representing time, j representing imaginary number unit, frequency difference between the first path of optical wave and the second path of optical wave being equal to frequency of the target terahertz signal, namely frequency f of the target terahertz signal THz ＝(ω c2 -ω c1 )/2π。
Further, step S2 includes: and a target signal generated by the sending signal processing module (112) is input into the dual-drive MZM, the target signal is modulated by the dual-drive MZM through a preset bias interval, and a dual-frequency optical signal is output.
Wherein, the output dual-frequency optical signal is: e s (t)，
Wherein, V rf1 And V rf2 Respectively representing the RF drive signal of the upper arm and the RF drive signal of the lower arm, V, of the dual drive MZM bias1 And V bias2 Respectively represent the DC bias voltage of the upper arm and the DC bias voltage of the lower arm of the dual-drive MZM, V π Is a half-wave voltage parameter of the dual drive MZM, wherein V rf1 ＝s(t)，V rf2 ＝-s(t)，V bias1 ＝0，V bias1 ＝V π The/3, s (t) represents a real-valued signal carrying baseband information. In this embodiment, a dual-drive MZM is used to perform data modulation on the generated dual-frequency optical waves. The target signal s (t) is generated by a transmission signal processing module (112), and the modulation format of the signal is not limited, such as Pulse Amplitude Modulation (PAM), carrierless amplitude modulation (CAP), discrete multi-tone (DMT), and the like. A schematic diagram of the driving signal and DC bias voltage settings of the dual-drive MZM is shown in FIG. 5, with V rf1 ＝s(t)，V rf2 ＝-s(t)，V bias1 ＝0，V bias1 ＝V π /3. After electro-optical modulation, the output dual-frequency optical signal can be expressed asAbove E s (t) is given as an expression.
In this embodiment, two independent lasers are adopted in the dual-wavelength light source module (110), and then the two independent lasers perform combined output through the same optical coupler, wherein the two independent lasers respectively emit a first optical wave and a second optical wave. Optionally, in the dual-wavelength light source module (110), two spectral lines are extracted from the spectral lines generated by the optical frequency comb through the wavelength selective switch, and the extracted spectral lines are input into the same optical coupler and then output in a combined manner.
For example: the invention provides a schematic structural diagram of two dual-wavelength light source modules, one of which adopts two independent lasers, as shown in figure 3, a first laser (with the center frequency f) c1 ) And a second laser (centered at f) c2 ) Directly combined by an optical coupler to form the double-wave light source module. Since the two lasers are independent of each other, their phase noise is not synchronized, i.e.
And another as shown in FIG. 4, the optical frequency comb generates multiple spectral lines, and a wavelength selective switch extracts the central frequency f c1 And f c2 And the two spectral lines are combined and output by adopting an optical coupler. Different from the former scheme, the two light waves come from the same light source, so that the phase noises of the two light waves have a certain synchronous relation and can be approximately regarded as
In this embodiment, step S3 includes:
the dual-frequency optical signal is input into a photoelectric detector (12) (such as a single-row carrier photoelectric detector) to carry out photoelectric conversion, and the dual-frequency optical signal is utilized to generate terahertz waves. Extracting a target terahertz signal E from the terahertz wave by a band-pass filter (130) THz (t)。
Wherein:
BPF[·]representing a band-pass filtering operation, R representing the responsivity of the photodetector (12), omega THz Represents the central angular frequency and ω of the generated terahertz signal THz ＝ω c2 -ω c1 ，
Represents the phase noise carried by the terahertz signal, which is converted from the phase noise of two light waves and
t represents time.
In this embodiment, the method further includes:
and the receiving end completes signal detection on the target terahertz signal through an envelope detector arranged in the receiving end, wherein the envelope detector comprises a square-law modeling diode and a low-pass filter, in the signal output by the envelope detector, the first term is a direct-current term, the second term comprises a required first-order target signal, and the third term belongs to an unwanted third-order beat frequency term. Wherein, the first and the second end of the pipe are connected with each other,
"desired" means that the item contains the signal of interest, from which the signal of interest can be recovered; conversely, terms that do not contain the target signal are undesirable and are referred to as crosstalk terms.
The signal output by the envelope detector is:
wherein, LPF [ ·]Represents a low-pass filtering operation for extracting the baseband signal while filtering out the frequency ω THz Or 2 omega THz Signal of (a), omega THz Representing the angular frequency of the terahertz signal, such a signal to be filtered out may be referred to as a high frequency signal with respect to a baseband signal.
For example: the target terahertz signal is transmitted through a terahertz antenna (such as a horn antenna) and a wireless channel, and a receiving end adopts an envelope detector (133) to complete signal detection, wherein the envelope detector is generally composed of a square-law modeling diode and a low-pass filter. Due to the output of the envelope detectorSignal E SBD There is no second order SSBI in the expression of (t), i.e., the recovered signal is not affected by SSBI. In addition, the half-wave voltage V due to the modulator π Greater than pi and small signal modulation is typically used to reduce the non-linearity of the modulator, i.e., | s (t) | < 1, so the third order beat terms are substantially negligible compared to the first order target signal. Thus, the above formula may be approximated as E SBD (t) ocs (t), i.e. the required target signal can be recovered directly after the dc is cut off from the output of the envelope detector without the influence of the SSBI.
Therefore, when the dual-drive MZM is fixed at a specific bias (DC bias difference V) bias1 -V bias2 ＝-V π And/3) when the wireless receiving end directly detects the terahertz signal generated by the double-frequency optical wave beat frequency based on the MZM modulation through the envelope detector, a second-order SSBI is not generated in the process, and therefore the required target signal can be directly recovered without depending on other technical means.
Specific examples thereof include:
to further illustrate setting the DC offset difference V bias1 -V bias2 ＝-V π The theoretical basis of/3 is that the embodiment uses V in practical application rf1 ＝s(t)，V rf2 (t) driving a dual drive MZM, let V diff ＝V bias1 -V bias2 Then the signal obtained after envelope detection can be expressed as:
wherein
Coefficients representing the dc term of the output signal, the desired first order target signal, the undesired second order SSBI and third order beat terms, respectively. Under the condition of small signal modulation, third-order beat frequency terms can be ignored, and the influence on the system performance is mainlySecond order SSBI, therefore, in order to obtain optimal system performance, the second order SSBI coefficients should be minimized. FIG. 6 shows the first and second order coefficients of the signal and the difference between the DC bias voltages V applied to the upper and lower arms of the dual drive MZM diff In relation to (b), wherein V π Take 3.6V. It can be seen that when V diff ＝±V π Or V diff ＝±V π When/3, the undesirable second-order SSBI coefficient C may be made 0, however, when V diff ＝±V π The required first order coefficient B is 0, and therefore the specific dc bias point is set to V diff ＝±V π /3, but taking V into account diff ＝V π B < 0 at/3, and additional inversion is required to recover the target signal, so that the optimum DC bias point is V diff ＝-V π /3. Handle V diff ＝-V π Substituting the formula (5) with the formula (3) to obtain E SBD (t) is shown.
As shown in FIG. 7, the demodulated error vector magnitude of CAP-16QAM signal with carrier frequency of 300GHz and rate of 40Gbps is compared with the DC bias voltage difference V applied to the upper and lower arms of the dual drive MZM diff Can find that the optimal system performance is V diff ＝-V π And/3 or so. Therefore, in the preset bias interval, the voltage difference V can be biased by direct current diff is-V π The best bias point is when/3, namely when the dual-drive MZM is at V diff ＝-V π The interval with the central point being 3 is as large as-V π 3. + -. 10%, i.e. [ -V ] π /3*90％，-V π /3*110％]. . Fig. 8 shows a constellation diagram of the CAP-16QAM signal recovered by the receiving end under the optimal dc bias condition, and clear constellation points represent that the system successfully implements modulation, transmission, and demodulation of the terahertz signal.
As shown in fig. 1, in this embodiment, there is also provided a photonic terahertz communication device, including: an optical transmitter (11), a photodetector (12) and a wireless transceiver (13).
And the optical transmitter (11) is used for generating the dual-frequency light wave and carrying out data modulation on the generated dual-frequency light wave to obtain a dual-frequency optical signal. And the photoelectric detector (12) is used for performing photoelectric conversion on the dual-frequency optical signal, generating terahertz waves through beat frequency processing, and extracting a target terahertz signal from the obtained terahertz waves. And the wireless transceiver (13) is used for transmitting the target terahertz signal to a receiving end through the terahertz antenna.
As shown in detail in fig. 2, the optical transmitter (11) comprises at least: the device comprises a dual-wavelength light source module (110), a dual-drive MZM (111) and a transmission signal processing module (112). The wireless transceiver (13) comprises a band-pass filter (130), a transmitting horn antenna (131), a receiving horn antenna (132), an envelope detector (133), a received signal processing module (134) and other units. As shown in fig. 3, two independent lasers are adopted in the dual-wavelength light source module (110), and then the two independent lasers perform combined output through the same optical coupler, wherein the two independent lasers respectively emit a first optical wave and a second optical wave. Alternatively, as shown in fig. 4, in the dual-wavelength light source module (110), two spectral lines are extracted from the spectral lines generated by the optical frequency comb through the wavelength selective switch, and the extracted spectral lines are input to the same optical coupler and then combined for output.
According to the photon terahertz communication method and device provided by the embodiment of the invention, the terahertz signal is generated by utilizing the heterodyne beat frequency of the two light waves modulated by the dual-drive MZM, the point-to-point high-speed communication of the terahertz wave with the carrier frequency of hundreds of GHz or more can be realized, and as no additional photoelectric equipment or unnecessary complex digital signal processing technology is introduced, the method and device have the characteristics of simple structure, strong compatibility and low deployment cost; and the frequency of the terahertz signal generated by the heterodyne beat frequency of the two beams of light has good tunability, and the terahertz signal can be dynamically adapted to terahertz communication systems with various frequency bands. Electro-optic modulation is completed based on the dual-drive MZM in the preset bias interval, so that SSBI cannot be generated in envelope detection of the generated terahertz signal, and the receiving sensitivity of the terahertz communication system can be improved.
All the embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, the apparatus embodiments are substantially similar to the method embodiments and therefore are described in a relatively simple manner, and reference may be made to some of the description of the method embodiments for relevant points. The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are also within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.
Claims (10)
1. A photonic terahertz communication method is characterized by comprising the following steps:
s1, generating a dual-frequency light wave;
s2, carrying out data modulation on the generated double-frequency light wave to obtain a double-frequency light signal;
s3, performing photoelectric conversion on the dual-frequency optical signal, generating terahertz waves through beat frequency processing, and extracting a target terahertz signal from the obtained terahertz waves;
s4, sending the target terahertz signal to a receiving end through a terahertz antenna;
step S1 includes: generating dual-frequency light waves through a dual-wavelength light source module (110), wherein the frequency difference between the first path of light waves and the second path of light waves is equal to the frequency of the target terahertz signal;
step S2 includes: inputting a target signal generated by a sending signal processing module (112) into a dual-drive MZM, modulating the target signal by using a preset bias interval through the dual-drive MZM, and outputting a dual-frequency optical signal;
wherein, the dual-drive MZM is fixed at a specific bias, and the DC bias difference is-V π /3。
2. The method of claim 1, wherein the size of the interval is [ -V ] in the preset offset interval π /3*90％，-V π /3*110％]，V π And the voltage parameter is a half-wave voltage parameter of the dual-drive MZM.
3. The method according to claim 1 or 2, wherein two independent lasers are used in the dual-wavelength light source module (110) and combined for output by the same optical coupler, wherein the two independent lasers emit the first and second light waves respectively.
4. The method according to claim 1 or 2, wherein in the dual-wavelength light source module (110), two spectral lines are extracted from the spectral lines generated by the optical frequency comb through the wavelength selective switch, and the extracted spectral lines are input into the same optical coupler and then combined for output.
5. The method according to claim 3, wherein step S3 includes:
inputting the dual-frequency optical signal into a photoelectric detector (12) for photoelectric conversion, and generating terahertz waves by using the dual-frequency optical signal;
extracting a target terahertz signal E from the terahertz wave by a band-pass filter (130) THz (t)。
6. The method of claim 5, further comprising:
and the receiving terminal finishes signal detection on the target terahertz signal through an envelope detector arranged in the receiving terminal, wherein the envelope detector comprises a square law modeling diode and a low-pass filter.
7. A method as claimed in claim 6, characterized in that in the signal output by the envelope detector the first term is a DC term, the second term comprises a desired first order target signal and the third term belongs to an undesired third order beat term baseband signal.
8. The method of claim 1, wherein the dual wavelength light source module (110) outputs light waves of a wavelength of
Wherein, P c1 、ω c1 And
respectively representing the output optical power, the central angular frequency and the phase noise of the first path of light wave, P c2 、ω c2 And
respectively representing output optical power, central angle frequency and phase noise of a second path of optical wave, c representing optical wave, t representing time, j representing imaginary number unit, and frequency difference between the first path of optical wave and the second path of optical wave being equal to frequency of the target terahertz signal, that is, frequency f of the target terahertz signal THz ＝(ω c2 -ω c1 )/2π。
9. A photonic terahertz communication device, comprising: an optical transmitter (11), a photodetector (12) and a wireless transceiver (13);
the optical transmitter (11) is used for generating dual-frequency light waves and carrying out data modulation on the generated dual-frequency light waves to obtain dual-frequency optical signals;
a photodetector (12) for performing photoelectric conversion on the dual-frequency optical signal, generating a terahertz wave through beat frequency processing, and extracting a target terahertz signal from the obtained terahertz wave;
the wireless transceiver (13) is used for completing the wireless transceiving, detection and signal receiving processing processes of the target terahertz signal;
the optical transmitter (11) comprises at least: the device comprises a dual-wavelength light source module (110), a dual-drive MZM (111) and a sending signal processing module (112);
two independent lasers are adopted in the dual-wavelength light source module (110), and then combined output is carried out through the same optical coupler, wherein the two independent lasers respectively emit a first path of light wave and a second path of light wave; the frequency difference between the first path of light wave and the second path of light wave is equal to the frequency of the target terahertz signal;
inputting a target signal generated by a sending signal processing module (112) into a dual-drive MZM (111), modulating the target signal by using a preset bias interval through the dual-drive MZM (111), and outputting a dual-frequency optical signal;
wherein, the dual-drive MZM is fixed at a specific bias, and the DC bias difference is-V π /3。
10. The photonic terahertz communication device according to claim 9, wherein in the dual-wavelength light source module (110), two spectral lines are extracted from the spectral lines generated by the optical frequency comb by the wavelength selective switch, and the extracted spectral lines are input to the same optical coupler and then combined for output.
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