CN111585660A - Terahertz wave signal generator based on dual-polarization MZM modulator and communication system - Google Patents
Terahertz wave signal generator based on dual-polarization MZM modulator and communication system Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/90—Non-optical transmission systems, e.g. transmission systems employing non-photonic corpuscular radiation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/516—Details of coding or modulation
- H04B10/5161—Combination of different modulation schemes
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/516—Details of coding or modulation
- H04B10/532—Polarisation modulation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/516—Details of coding or modulation
- H04B10/54—Intensity modulation
- H04B10/541—Digital intensity or amplitude modulation
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Abstract
The invention relates to a terahertz wave signal generator based on a dual-polarization MZM modulator and a communication system, wherein the signal generator comprises: two lasers for generating laser light with a frequency interval in the terahertz waveband range; the dual-polarization MZM modulator is used for carrying out polarization multiplexing light intensity modulation on the two beams of laser, and is driven by a binary electric signal to generate two beams of PDM-OOK signals; the polarization controller is used for adjusting the polarization state of the PDM-OOK signal; the polarizer is used for outputting light information in the polarization direction of 0 degree to obtain two baseband PAM4 light signals; an optical amplifier for amplifying the baseband PAM4 optical signal; and the photoelectric detector is used for beating the optical signal to obtain a terahertz wave PAM4 wireless signal. Compared with the prior art, the invention has the characteristics of convenience, flexibility, simple structure and low cost, improves the system speed, reduces the bandwidth requirement of the electronic device at the transmitting end and can effectively reduce the system cost.
Description
Technical Field
The invention belongs to the technical field of Radio-over-Fiber (ROF) communication systems, and particularly relates to a terahertz wave signal generator based on a dual-polarization MZM modulator and a communication system.
Background
Today's digital communication technology is rapidly developing and the capacity of communication systems and the demands of subscriber access are also growing explosively. The traditional wireless access system cannot support the future digital application scenario with higher rate requirement due to the exhaustion of frequency band resources. Therefore, the utilization of millimeter wave and terahertz wave frequency bands with higher frequencies is an important development direction of wireless communication systems in the future. The frequency of the terahertz wave is higher than 300GHz, so that the terahertz wave can provide an effective communication bandwidth of hundreds of GHz, and is the most ideal communication frequency band. Due to the high frequency of terahertz waves, the traditional electrical generation mode requires high system cost and technical difficulty.
NRZ encoded binary information is the most fundamental signal modulation format and is widely used in various communication systems. To increase the transmission rate of the system, it is often necessary to adopt higher-order Modulation formats, such as Pulse Amplitude Modulation (PAM), Quadrature Amplitude Modulation (QAM), and the like. Converting binary information into a signal of a high order modulation format requires a digital-to-analog converter (DAC) to implement, but introducing a digital-to-analog converter into the system would increase the cost of the system. Also, in a radio access network that needs to be laid out on a large scale, cost and power consumption are important considerations for system design. It is necessary to study a signal generation system of terahertz waves.
Prior patent application CN109586805A discloses a terahertz OAM generation system based on optical mixing and merging optical communication systems, comprising: two DFB lasers with frequency difference in terahertz frequency band generate optical communication wavelength; the spatial light modulator is used for modulating orbital angular momentum for one path of optical communication wavelength; the Mach-Zehnder modulator is used for modulating baseband electric signal information to the other path of optical communication wavelength; the terahertz photoconductive antenna mixer is used for generating terahertz frequency band communication carrier waves of modulated baseband signals carrying orbital angular momentum of a certain order by beating the combined optical signals. The terahertz OAM generation system also has the following defects: 1) the structure is complex and the price is expensive. The generation of the orbital angular momentum signal requires a spatial light modulator, and the device has a complex structure and is expensive. 2) The resulting OAM signal receiver is less sensitive. PAM4 has the best sensitivity and is most easily generated for all higher order modulation formats (number of levels greater than 4).
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a terahertz wave signal generator and a communication system based on a dual-polarization MZM modulator, which are convenient, flexible, simple in structure and low in cost.
The purpose of the invention can be realized by the following technical scheme:
a terahertz wave signal generator based on a dual-polarized MZM modulator comprises:
the two lasers are used for generating laser, and the frequency interval of the two generated lasers is within the range of the terahertz waveband;
the dual-polarization MZM modulator is used for performing polarization multiplexing light intensity modulation on the two laser beams;
the dual-polarization MZM modulator is driven by a binary electric signal to generate two beams of PDM-OOK signals;
the system further comprises:
the polarization controller is used for adjusting the polarization state of the PDM-OOK signal;
the polarizer is used for outputting optical information of the PDM-OOK signal in the polarization direction of 0 degree to obtain two baseband PAM4 optical signals;
an optical amplifier for amplifying the baseband PAM4 optical signal;
and the photoelectric detector is used for beating the optical signal to obtain a terahertz wave PAM4 wireless signal.
Further, the dual-polarized MZM modulator is integrated with two MZM modulators and a polarization beam splitter/polarization beam combiner.
Further, the direct current bias of the dual-polarized MZM modulator is at an orthogonal point.
Further, the optical input end of the dual-polarized MZM modulator is connected to the two lasers through an optical fiber.
Further, the electrical input end of the dual-polarized MZM modulator is connected with two binary signal sources through a cable.
Further, the optical information passing through the polarizer is adjusted to obtain the baseband PAM4 optical signal based on the eye pattern generated by the eye pattern instrument.
Further, the polarization controller rotates the PDM-OOK signal by a set angle, so that the projection of the PDM-OOK signal in the polarization direction of 0 ° is a standard PAM4 signal.
Further, the set angle satisfies a condition that a PAM4 terahertz wave signal can be generated at one point.
Further, the dual-polarization MZM modulator, the polarization controller, the polarizer, the optical amplifier and the photoelectric detector are sequentially connected through optical fibers.
The invention also provides a communication system which comprises the terahertz wave signal generator based on the dual-polarization MZM modulator.
Compared with the prior art, the invention has the following beneficial effects:
1) the terahertz wave PAM4 signal generated by the dual-polarized MZM modulator has the characteristics of convenience, flexibility and low cost.
2) According to the invention, a binary signal is used for directly driving a dual-polarized light intensity modulator, a baseband PAM4 signal is generated by means of the polarization modulator and the polarizer, and a terahertz wave PAM4 signal is finally generated by the photoelectric detector, so that the modulation efficiency is improved, the system cost and complexity are reduced, and the cost and power consumption of a DAC module are saved.
3) The invention adopts an optical fiber-wireless (ROF) communication system, can well combine the advantages of low loss, high bandwidth and anti-electromagnetic interference of an optical fiber transmission system and the advantages of wide coverage and high mobility of the wireless communication system, and effectively reduces the cost and the complexity of the system
4) The invention uses PD beat frequency to generate terahertz wave signals, thereby avoiding the complexity and inflexibility of an electric terahertz system.
5) The invention reduces the system cost, effectively improves the system speed, reduces the bandwidth requirement of the electronic device at the transmitting end, can effectively reduce the system cost, and exerts great advantages on the wireless access network mainly based on the future ROF system.
Drawings
FIG. 1 is a schematic diagram of a direct drive dual-polarization MZM generating a PDM-OOK signal using binary signals;
fig. 2 is a schematic diagram of a polarization controller and a polarizer for realizing generation of a baseband PAM4 optical signal, where (a) is an original optical signal, (b) is an optical signal after polarization state rotation, and (c) is a polarizer output signal;
FIG. 3 is a schematic diagram of the generation of a terahertz wave signal using a photodetector;
FIG. 4 is a schematic diagram of a specific connection mode of a terahertz wave PAM4 signal generation system;
in the figure, 1, 11-laser, 2, 22-binary signal source, 3-dual-polarization MZM modulator, 4-polarization controller, 5-polarizer, 6-optical amplifier, and 7-photodetector.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments. The present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.
As shown in fig. 4, the present embodiment provides a terahertz wave signal generator based on a dual-polarized MZM modulator, including:
the two lasers 1 and 11 are used for generating laser, and the frequency interval of the two generated laser beams is within the range of a terahertz waveband;
the dual-polarization MZM modulator 3 is driven by a binary electric signal and is used for carrying out light intensity modulation of polarization multiplexing (PDM) On the two laser beams and generating two PDM-OOK (On-off keying) signals;
the polarization controller 4 is used for adjusting the polarization state of the PDM-OOK signal;
the polarizer 5 is used for outputting optical information of the PDM-OOK signal in the polarization direction of 0 degree to obtain two baseband PAM4 optical signals;
an optical amplifier 6 for amplifying the baseband PAM4 optical signal;
and the photoelectric detector 7 is used for beating the optical signal to obtain a terahertz wave PAM4 wireless signal.
The dual-polarized MZM modulator 3 integrates two MZM modulators and a polarization beam splitter/polarization beam combiner, with dc bias at orthogonal points. The optical input of the dual-polarized MZM modulator 3 is connected to the two lasers 1, 11 via optical fibers. The electrical input end of the dual-polarization MZM modulator 3 is connected to two binary signal sources 2, 22 through a cable, the binary signal sources being data sources for driving the light intensity modulator.
The polarization controller 4 rotates the PDM-OOK signal by a set angle, so that the projection of the PDM-OOK signal in the polarization direction of 0 ° is a standard PAM4 signal. The optical information passing through the polarizer 5 is adjusted to obtain the baseband PAM4 optical signal based on the eye pattern generated by the eye pattern machine.
As shown in fig. 1, laser 1 and laser 11 respectively generate laser sources: ej ω 1t and ej ω 2 t. The frequency interval between the two beams of laser is delta f and is within the range of terahertz wave band. Two binary electrical signals 2 and 22 directly drive a dual-polarized MZM modulator 3 for modulating the two input beams of laser light and generating a PDM-OOK signal. The light intensity modulator operates at an orthogonal point for intensity modulation. The generated PDM-OOK signal is composed of two intensity-modulated OOK signals (x (t) and y (t)) with orthogonal polarization states, as shown in fig. 2 (a). After being adjusted by the polarization controller 4, the angle between the output signal and the original signal axis is α, as shown in fig. 2 (b). The polarizer 5 enables only the projection of the signal in the 0 ° direction to be output, as shown in fig. 2 (c). The signal it outputs is therefore represented as: x (t) cos (α) -Y (t) sin (α). When α is a specific value, the output optical signal is a PAM4 signal. In the present embodiment, Tan (α) is 2, and after the generated baseband PAM4 optical signal is amplified in power by the optical amplifier 6, a terahertz wave PAM4 signal having a carrier frequency Δ f is generated by the photodetector 7 in a beat frequency manner, as shown in fig. 3.
The vector millimeter wave generation system is specifically connected as follows, as shown in fig. 4. The output ends of the laser 1 and the laser 11 are connected with the optical input end of the dual-polarization MZM modulator 3 by optical fibers, and the output ends of the binary signal source 2 and the binary signal source 22 are connected with the electrical input end of the dual-polarization MZM modulator 3 by cables. The output end of the dual-polarization MZM modulator 3 is connected with the optical input end of the polarization controller 4 by an optical fiber. The output end of the polarization controller 4 is connected with the optical input end of the polarizer 5 by an optical fiber. The output end of the polarizer 5 is connected to the optical input end of the optical amplifier 6 by an optical fiber. The output end of the optical amplifier 6 is connected with the optical input end of the photoelectric detector by an optical fiber.
The embodiment can also realize a communication system, which includes the above-mentioned terahertz wave signal generator based on the dual-polarization MZM modulator.
The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions that can be obtained by a person skilled in the art through logic analysis, reasoning or limited experiments based on the prior art according to the concept of the present invention should be within the protection scope determined by the present invention.
Claims (10)
1. A terahertz wave signal generator based on a dual-polarized MZM modulator comprises:
two lasers (1, 11) for generating laser light, the frequency interval of the two generated laser light is in the terahertz waveband range;
the dual-polarization MZM modulator (3) is used for performing polarization multiplexing light intensity modulation on the two laser beams;
the dual-polarization MZM modulator (3) is driven by a binary electric signal to generate two beams of PDM-OOK signals;
the system further comprises:
a polarization controller (4) for adjusting the polarization state of the PDM-OOK signal;
the polarizer (5) is used for outputting light information of the PDM-OOK signal in the polarization direction of 0 degrees to obtain two baseband PAM4 light signals;
an optical amplifier (6) for amplifying the baseband PAM4 optical signal;
and the photoelectric detector (7) is used for beating the optical signal to obtain a terahertz wave PAM4 wireless signal.
2. The terahertz-wave signal generator based on a dual-polarized MZM modulator of claim 1, characterized in that said dual-polarized MZM modulator (3) integrates two MZM modulators and a polarization beam splitter/polarization beam combiner.
3. The terahertz-wave signal generator based on a dual-polarized MZM modulator of claim 1, wherein said dual-polarized MZM modulator (3) is DC-biased at an orthogonal point.
4. The terahertz-wave signal generator based on a dual-polarized MZM modulator of claim 1, characterized in that the optical inputs of said dual-polarized MZM modulator (3) are connected to said two lasers (1, 11) by optical fibers.
5. Terahertz-wave signal generator based on a dual-polarized MZM-modulator according to claim 1, characterized in that the electrical inputs of said dual-polarized MZM-modulator (3) are connected to two binary signal sources (2, 22) by a cable.
6. The terahertz-wave signal generator based on a dual-polarized MZM modulator of claim 1, wherein the optical information passing through the polarizer (5) is adjusted to obtain the baseband PAM4 optical signal based on an eye pattern generated by an eye pattern machine.
7. The terahertz-wave signal generator based on a dual-polarized MZM modulator of claim 1, wherein said polarization controller (4) sets the angle of rotation of the PDM-OOK signal such that its projection in the 0 ° polarization direction is a standard PAM4 signal.
8. The terahertz-wave signal generator based on the dual-polarized MZM modulator of claim 7, wherein said set angle satisfies the condition that a PAM4 terahertz-wave signal can be generated at a point.
9. The terahertz wave signal generator based on a dual-polarized MZM modulator of claim 1, wherein said dual-polarized MZM modulator (3), polarization controller (4), polarizer (5), optical amplifier (6), and photodetector (7) are connected in sequence by optical fibers.
10. A communication system comprising the terahertz-wave signal generator based on the dual-polarized MZM modulator of claim 1.
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| CN111447014A (en) * | 2020-04-22 | 2020-07-24 | 复旦大学 | Method and device for generating multilevel optical signal based on single modulator |
| CN113114375A (en) * | 2021-04-30 | 2021-07-13 | 网络通信与安全紫金山实验室 | Photon terahertz communication method and device |
| CN113162694A (en) * | 2021-02-23 | 2021-07-23 | 复旦大学 | Photon auxiliary vector millimeter wave signal generation system |
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