CN106877940B - Optical signal transmitting end and millimeter wave optical carrier wireless communication system - Google Patents
Optical signal transmitting end and millimeter wave optical carrier wireless communication system Download PDFInfo
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- CN106877940B CN106877940B CN201710271462.0A CN201710271462A CN106877940B CN 106877940 B CN106877940 B CN 106877940B CN 201710271462 A CN201710271462 A CN 201710271462A CN 106877940 B CN106877940 B CN 106877940B
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- 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
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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
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- H04B10/503—Laser transmitters
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Abstract
The invention discloses an optical signal transmitting end and a millimeter wave optical carrier wireless communication system, which comprises a laser, an optical power divider, a local oscillator signal generating module, an optical carrier modulator, a band-pass filter, a baseband data generating module, a baseband data modulator and an optical coupler, wherein the laser is connected with the input end of the optical power divider, the first output end of the optical power divider is connected with the optical carrier modulator, and the second output end of the optical power divider is connected with the baseband data modulator; the optical carrier modulator is also respectively connected with the local oscillation signal output module and the band-pass filter; the baseband data modulator is also connected with the baseband data generation module; the optical couplers are respectively connected with the band-pass filter and the baseband data modulator. The optical power divider is arranged at the output end of the laser, has low price and low cost, and can divide the original light wave output by the laser, so that the power of two optical signals coupled by the optical coupler is balanced, and the millimeter wave quality is improved.
Description
Technical Field
The invention relates to the technical field of millimeter wave generation, in particular to an optical signal transmitting end and a millimeter wave optical carrier wireless communication system.
Background
With the explosive growth of communication services in the 5G era, millimeter waves are gaining more and more attention and research because of their ability to provide a tremendous bandwidth and to maximally reduce interference with existing wireless communication services. Millimeter wave optical wireless communication systems use optical methods to generate high frequency millimeter waves, and because of the small loss of the optical fiber used to transmit the optical signals, the system can transmit the optical signals to a far distance, and millimeter waves can be obtained by using a photodetector to beat the optical signals at the receiving end.
In the prior art, an optical signal transmitting end generally modulates an original optical wave generated by a laser through an external modulator to obtain a plurality of coherent optical carriers, then selects two optical carriers through a WSS (wavelength selective switch), wherein one optical carrier does not undergo any processing to obtain an unmodulated optical signal, and the other optical carrier is input into a baseband data modulator to modulate baseband data to obtain a modulated optical signal, but after the optical wave is modulated through the modulator, the power of the optical signal is obviously reduced, the optical carrier finally output by the baseband data modulator is the optical carrier obtained after being modulated through the external modulator and the two modulators of the baseband data modulator, and the power difference between the optical carrier and the optical carrier modulated by the other optical carrier is larger only through the external modulator, so that the quality of millimeter waves obtained after the two optical carriers are finally subjected to frequency beating is poor.
Therefore, how to provide a solution to the above technical problem is a problem that a person skilled in the art needs to solve at present.
Disclosure of Invention
The invention aims to provide an optical signal transmitting end, on one hand, compared with a wavelength selective switch, the optical power divider has the advantages that the price is cheaper, the cost is low, on the other hand, the optical power divider can divide the original light wave output by a laser according to a preset proportion, so that a high-power light wave is directly provided for a baseband data modulator in one optical path for baseband data modulation, the insertion loss of the modulator and a filter in the other optical path is also considered, the light wave is provided for the modulators in the two latter optical paths in a relatively balanced way, the power of two optical signals coupled by an optical coupler is relatively balanced, the optical power ratio is reduced, and the quality of millimeter waves is improved; another object of the present invention is to provide a millimeter wave optical-carrier wireless communication system including the optical signal transmitting terminal, which has the above advantages.
In order to solve the technical problems, the invention provides an optical signal transmitting end, which comprises a laser, an optical power divider, a local oscillator signal generating module, an optical carrier modulator, a band-pass filter, a baseband data generating module, a baseband data modulator and an optical coupler, wherein:
the first output end of the optical splitter is connected with the optical carrier modulator, the second output end of the optical splitter is connected with the baseband data modulator, and the optical splitter is used for splitting the original light wave output by the laser according to a preset proportion to obtain a first original light wave and a second original light wave, outputting the first original light wave to the optical carrier modulator and outputting the second original light wave to the baseband data modulator;
the optical carrier modulator is further connected with the local oscillator signal output module and the band-pass filter respectively, and is used for modulating the local oscillator signal output by the local oscillator signal output module according to the first original light wave to obtain a plurality of optical carriers; the band-pass filter is used for filtering the plurality of optical carriers to obtain an unmodulated first optical carrier;
the baseband data modulator is further connected with the baseband data generating module and is used for modulating the baseband data output by the baseband data generating module according to the second original light wave to obtain a modulated second optical carrier;
the optical coupler is respectively connected with the band-pass filter and the baseband data modulator and is used for optically coupling the first optical carrier and the second optical carrier to obtain optical signals, and millimeter waves are obtained through beat frequency.
Preferably, the optical carrier modulator is a first lithium niobate mach-zehnder modulator and a second lithium niobate mach-zehnder modulator connected.
Preferably, the local oscillation signal generating module includes:
a local oscillator for generating an original local oscillator signal;
the input end of the electric amplifier is connected with the local oscillator, and the output end of the electric amplifier is connected with the input end of the first electric power divider, and the electric amplifier is used for amplifying the original local oscillator signal to obtain an amplified local oscillator signal;
the first output end of the first electric power divider is connected with the input end of the second electric power divider, the second output end of the first electric power divider is connected with the input end of the third electric power divider, the first output end of the second electric power divider is directly connected with the first lithium niobate Mach-Zehnder modulator, and the second output end of the second electric power divider is connected with the first lithium niobate Mach-Zehnder modulator through a first electric phase shifter; the first output end of the third electric power divider is directly connected with the second lithium niobate Mach-Zehnder modulator, and the second output end of the third electric power divider is connected with the second lithium niobate Mach-Zehnder modulator through a second electric phase shifter;
the first electric power divider is used for carrying out electric power division on the amplified local oscillation signals to obtain first local oscillation signals and second local oscillation signals, the second electric power divider is used for carrying out electric power division on the first local oscillation signals to obtain third local oscillation signals and fourth local oscillation signals, the third local oscillation signals are directly output to the first lithium niobate Mach-Zehnder modulator, the fourth local oscillation signals are output to the first lithium niobate Mach-Zehnder modulator after being subjected to phase shift of the first electric phase shifter, the third electric power divider is used for carrying out electric power division on the second local oscillation signals to obtain fifth local oscillation signals and sixth local oscillation signals, the fifth local oscillation signals are directly output to the second lithium niobate Mach-Zehnder modulator, and the sixth local oscillation signals are output to the second lithium niobate Mach-Zehnder modulator after being subjected to phase shift of the second electric phase shifter.
Preferably, the baseband data modulator is an I-Q quadrature modulator.
Preferably, the baseband data generation module includes:
a pulse generator for generating a pseudo-random non-return to zero code;
the quadrature amplitude modulation mapper is connected with the pulse generator and is used for carrying out quadrature amplitude modulation processing on the pseudo-random non-return-to-zero code to obtain real part and imaginary part signals;
the Orthogonal Frequency Division Multiplexing (OFDM) modulator is connected with the orthogonal amplitude modulation mapper and is used for carrying out serial-parallel conversion and fast Fourier transform processing on the real part and the imaginary part signals to obtain real part and imaginary part OFDM signals;
the first low-pass filter ELPF is respectively connected with the OFDM modulator and the I-Q orthogonal modulator and is used for carrying out low-pass filtering processing on the OFDM signal with the real part to obtain first baseband data, and sending the first baseband data to the I-Q orthogonal modulator;
and the second ELPF is respectively connected with the OFDM modulator and the I-Q orthogonal modulator and is used for carrying out low-pass filtering processing on the OFDM signal with the imaginary part to obtain second baseband data, and sending the second baseband data to the I-Q orthogonal modulator.
Preferably, the division ratio of the optical splitter is 90%:10%, wherein the power ratio of the first original light wave to the second original light wave is 9:1.
preferably, the system further comprises:
and the erbium-doped fiber amplifier is connected with the optical coupler and is used for amplifying the optical signal.
Preferably, the frequency interval between the first optical carrier and the second optical carrier is 60GHz.
In order to solve the technical problem, the invention also provides a millimeter wave optical carrier wireless communication system, which comprises the optical signal transmitting end, wherein the optical signal transmitting end is used for generating an optical signal, and the millimeter wave optical carrier wireless communication system also comprises an optical fiber used for transmitting the optical signal and a photoelectric detector for beating the optical signal to obtain millimeter waves.
The invention provides an optical signal transmitting end and a millimeter wave optical carrier wireless communication system, which comprises a laser, an optical power divider, a local oscillator signal generating module, an optical carrier modulator, a band-pass filter, a baseband data generating module, a baseband data modulator and an optical coupler, wherein the laser is connected with the input end of the optical power divider, the first output end of the optical power divider is connected with the optical carrier modulator, and the second output end of the optical power divider is connected with the baseband data modulator; the optical carrier modulator is also respectively connected with the local oscillation signal output module and the band-pass filter; the baseband data modulator is also connected with the baseband data generation module; the optical couplers are respectively connected with the band-pass filter and the baseband data modulator.
Therefore, the optical power divider is arranged at the output end of the laser, on one hand, compared with the wavelength selective switch, the optical power divider is cheaper in price and low in cost, and on the other hand, the optical power divider can divide the original light wave output by the laser according to the preset proportion, so that a light wave with higher power is directly provided for a baseband data modulator in one light path for baseband data modulation, the insertion loss of the modulator and a filter in the other light path is also considered, and the light wave is provided for the modulators in the two latter paths in a relatively balanced manner, so that the power of two light signals coupled by the optical coupler is relatively balanced, the light power ratio is reduced, and the quality of millimeter waves is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required in the prior art and the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of an optical signal transmitting end provided by the present invention;
fig. 2 is a schematic structural diagram of an optical signal transmitting end according to the present invention;
FIG. 3 is a spectrum diagram of the point A in FIG. 2 when the optical signal transmitting terminal provided by the invention works;
FIG. 4 is a spectrum diagram of the point B in FIG. 2 when the optical signal transmitting terminal provided by the invention works;
FIG. 5 is a graph of the spectrum at point C in FIG. 2 when the optical signal transmitting terminal provided by the invention is operated;
FIG. 6 is a graph showing a frequency spectrum of the point D in FIG. 2 when the optical signal transmitting terminal provided by the invention works;
fig. 7 is a schematic structural diagram of a millimeter wave optical carrier wireless communication system according to the present invention.
Detailed Description
The core of the invention is to provide an optical signal transmitting end, on one hand, compared with a wavelength selective switch, the optical power divider has cheaper price and low cost, on the other hand, the optical power divider can divide the original light wave output by a laser according to a preset proportion, thereby directly providing a light wave with higher power for a baseband data modulator in one light path for baseband data modulation, and also taking account of the insertion loss of the modulator and a filter in the other light path, and providing the light wave for the modulators in the two latter light paths in a relatively balanced way, so that the power of two optical signals coupled by an optical coupler is relatively balanced, the optical power ratio is reduced, and the quality of millimeter waves is improved; another core of the present invention is to provide a millimeter wave optical-carrier wireless communication system including the optical signal transmitting terminal, which has the above beneficial effects.
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1 and fig. 2, fig. 1 is a schematic structural diagram of an optical signal transmitting end provided by the present invention, and fig. 2 is a schematic structural diagram of an optical signal transmitting end provided by the present invention. The system comprises a laser 1, an optical splitter 2, a local oscillator signal generating module 4, an optical carrier modulator 3, a band-pass filter 5, a baseband data generating module 7, a baseband data modulator 6 and an optical coupler 8, wherein:
the laser 1 is connected with the input end of the optical splitter 2, the first output end of the optical splitter 2 is connected with the optical carrier modulator 3, the second output end of the optical splitter 2 is connected with the baseband data modulator 6, the optical splitter 2 is used for splitting the original light wave output by the laser 1 according to a preset proportion to obtain a first original light wave and a second original light wave, the first original light wave is output to the optical carrier modulator 3, and the second original light wave is output to the baseband data modulator 6;
specifically, the laser 1 outputs an original light wave to the optical power divider 2, and after the optical power divider 2 receives the original light wave, the original light wave is divided according to a preset division ratio, and the division ratio is assumed to be N:1, wherein N is any positive real number, the power of the first original light wave occupies N/n+1 of the power of the original light wave, and the power of the second original light wave occupies 1/n+1 of the power of the original light wave.
As a preferred embodiment, the division ratio of the optical splitter 2 is 90%:10%, wherein the power ratio of the first original light wave to the second original light wave is 9:1.
of course, the power dividing ratio of the optical power divider 2 may be any other ratio, and the present invention is not limited thereto, and may be determined according to practical situations.
It can be understood that, in this application, the optical carrier modulator 3 and the baseband data modulator 6 occupy one path respectively, and in view of the fact that each modulator can cause the decline of the power of the optical carrier outputted by the modulator when modulating the optical wave, the optical splitter 2 is directly arranged in front of the modulator, and outputs an optical wave with larger power to the baseband data modulator 6 compared with the prior art to the original optical wave power outputted by the laser 1, and the preset proportion can make the power ratio of the optical carrier outputted by the optical carrier modulator 3 and the optical carrier outputted by the baseband data modulator 6 become smaller, and can obtain millimeter waves with higher quality after the coupling is the beat frequency of the optical signal.
In addition, compared with the WSS in the prior art, the optical power divider 2 has lower price, and the power dividing ratio can be adjusted according to actual conditions.
The optical carrier modulator 3 is further connected with the local oscillation signal output module and the band-pass filter 5 respectively, and the optical carrier modulator 3 is used for modulating the local oscillation signal output by the local oscillation signal output module according to the first original light wave to obtain a plurality of optical carriers; the band-pass filter 5 is used for filtering the plurality of optical carriers to obtain an unmodulated first optical carrier;
specifically, the local oscillation signal output module drives the local oscillation signal output by the local oscillation signal output module on the optical carrier modulator 3 to obtain a plurality of optical carriers, and the band-pass filter 5 filters the plurality of optical carriers to obtain a clean optical carrier which is not processed by any process and is required by a user, namely an unmodulated first optical carrier.
Here, the term "unmodulated" and "modulated" as used below refer to whether or not baseband data is modulated, and if not, is referred to as "unmodulated", and otherwise, is referred to as "modulated".
As a preferred embodiment, the frequency interval between the first optical carrier and the second optical carrier is 60GHz.
Considering that the millimeter wave of 60GHz in the prior art is more applied in the field of high-speed wireless communication, the frequency of the first optical carrier may be 60GHz (relative to 193.1 THz), and of course, the first optical carrier of other frequencies may be selected according to actual needs.
As a preferred embodiment, the local oscillation signal generating module 4 includes:
a local oscillator LO for generating an original local oscillator signal;
the input end of the electric amplifier EA is connected with the local oscillator LO, and the output end of the electric amplifier EA is connected with the input end of the first electric power divider ES1 and is used for amplifying the original local oscillator signal to obtain an amplified local oscillator signal;
the first output end of the first electric power divider ES1 is connected with the input end of the second electric power divider ES2, the second output end of the first electric power divider ES1 is connected with the input end of the third electric power divider ES3, the first output end of the second electric power divider ES2 is directly connected with the first lithium niobate Mach-Zehnder modulator, and the second output end of the second electric power divider ES2 is connected with the first lithium niobate Mach-Zehnder modulator through the first electric phase shifter EPS 1; the first output end of the third electric power divider ES3 is directly connected with the second lithium niobate Mach-Zehnder modulator, and the second output end of the third electric power divider ES3 is connected with the second lithium niobate Mach-Zehnder modulator through the second electric phase shifter EPS 2;
the first electric power divider ES1 is used for carrying out electric power division on the amplified local oscillation signals to obtain first local oscillation signals and second local oscillation signals, the second electric power divider ES2 is used for carrying out electric power division on the first local oscillation signals to obtain third local oscillation signals and fourth local oscillation signals, the third local oscillation signals are directly output to the first lithium niobate Mach-Zehnder modulator, the fourth local oscillation signals are output to the first lithium niobate Mach-Zehnder modulator after being subjected to phase shift by the first electric phase shifter EPS1, the third electric power divider ES3 is used for carrying out electric power division on the second local oscillation signals to obtain fifth local oscillation signals and sixth local oscillation signals, the fifth local oscillation signals are directly output to the second lithium niobate Mach-Zehnder modulator, and the sixth local oscillation signals are output to the second lithium niobate Mach-Zehnder modulator after being subjected to phase shift by the second electric phase shifter EPS 2.
The above specific local oscillation signal generating module 4 provided for the present invention may, of course, also select other types of local oscillation signal generating modules 4, according to actual situations.
The baseband data modulator 6 is further connected to the baseband data generating module 7, and is configured to modulate the baseband data output by the baseband data generating module 7 according to the second original light wave, so as to obtain a modulated second optical carrier;
specifically, the baseband data modulator 6 modulates the baseband data output by the baseband data generating module 7 according to the second original light wave, and modulates the baseband data from the electrical domain to the optical domain, so as to obtain a modulated optical carrier, namely a second optical carrier.
As a preferred embodiment, the optical carrier modulator 3 is a first lithium niobate mach-zehnder modulator and a second lithium niobate mach-zehnder modulator connected.
Specifically, the optical carrier modulator 3 may be a cascaded lithium niobate mach-zehnder modulator to generate a coherent optical carrier. The benefits of using a cascaded lithium niobate mach-zehnder modulator are: (1) the structure is simple, and when the modulators are biased at the maximum transmission point, the configuration of the driving voltage source of the modulator can be further simplified; (2) the cascade lithium niobate Mach-Zehnder modulator can generate 4 times of frequency multiplication number, and the complexity is not high, so that the system finds a good balance point between the system complexity and the frequency multiplication number.
As a preferred embodiment, the baseband data modulator 6 is an I-Q quadrature modulator.
Of course, the baseband data modulator 6 may be any other type of modulator, and the present invention is not limited in particular herein.
As a preferred embodiment, the baseband data generation module 7 includes:
a pulse generator 71 for generating a pseudo-random non-return to zero code;
a quadrature amplitude modulation mapper 72 connected to the pulse generator 71 for performing quadrature amplitude modulation processing on the pseudo-random non-return-to-zero code to obtain real and imaginary signals;
an Orthogonal Frequency Division Multiplexing (OFDM) modulator 73 connected with the orthogonal amplitude modulation mapper 72, for performing serial-parallel conversion and fast Fourier transform processing on the real and imaginary signals to obtain real and imaginary OFDM signals;
a first low-pass filter ELPF74 connected to the OFDM modulator 73 and the I-Q quadrature modulator, respectively, for performing low-pass filtering processing on the real OFDM signal to obtain first baseband data, and transmitting the first baseband data to the I-Q quadrature modulator;
and the second ELPF75 is respectively connected with the OFDM modulator and the I-Q orthogonal modulator, and is used for performing low-pass filtering processing on the OFDM signal with the imaginary part to obtain second baseband data, and transmitting the second baseband data to the I-Q orthogonal modulator.
Of course, the baseband data generation module 7 herein may be other types of baseband data generation modules 7, and the present invention is not limited herein.
The optical coupler 8 is connected to the band-pass filter 5 and the baseband data modulator 6, and is used for optically coupling the first optical carrier and the second optical carrier to obtain an optical signal, and obtaining millimeter waves with beat frequency.
After receiving the first optical carrier and the second optical carrier, the optical coupler 8 couples the first optical carrier and the second optical carrier to obtain an optical signal, and after the optical signal is transmitted through an optical fiber, the optical signal is subjected to beat frequency to obtain millimeter waves.
As a preferred embodiment, the system further comprises:
an erbium-doped fiber amplifier 9 connected to the optical coupler 8 for amplifying the optical signal.
It should be noted that, the optical signal is generally transmitted to the receiving end through the optical fiber, the user can obtain the millimeter wave by beating the optical signal at the receiving end through the photoelectric detector, the optical fiber transmission has loss, and the erbium-doped optical fiber amplifier is used for amplifying the optical signal, so that the power of the optical signal at the receiving end is not reduced very low after the optical fiber transmission, and then the millimeter wave with better quality can be obtained by beating the frequency.
Referring to fig. 3-6, fig. 3 is a spectrum diagram of a point a in fig. 2 when the optical signal transmitting terminal provided by the present invention is in operation, fig. 4 is a spectrum diagram of a point B in fig. 2 when the optical signal transmitting terminal provided by the present invention is in operation, fig. 5 is a spectrum diagram of a point C in fig. 2 when the optical signal transmitting terminal provided by the present invention is in operation, and fig. 6 is a spectrum diagram of a point D in fig. 2 when the optical signal transmitting terminal provided by the present invention is in operation.
Specifically, an electric amplifier EA amplifies a local oscillation signal and is driven in LiNbO through an electric power divider and an electric phase shifter 3 -MZM 1 and LiNbO 3 On MZM 2, both modulators are biased at the maximum transmission point to simplify the configuration of the modulator drive voltage source. In the uplink branch, the output end of LiNbO3-MZM 2 has a plurality of harmonics, as shown in FIG. 3, the + -4-order harmonics are at + -60 GHz, and then the filter is carried out to obtain FIG. 4. In the lower optical branch, after passing through the I-Q quadrature modulator strip, the center optical carrier carries baseband data, as shown in fig. 5. The final coupling is formed as in fig. 6. The optical signal in fig. 6 is subjected to beat frequency by the photodetector, and 60GHz millimeter wave is obtained.
In addition, the division ratio of the optical divider 2 may be set to 90%:10%, that is, the upper path occupies 90% of the output power of the laser 1, and the lower path occupies 10% of the output power of the laser 1, the reason for setting the power division ratio is that: on the one hand, the optical wave with larger power is directly divided into the optical wave with larger power for the modulation of the I-Q quadrature modulator, on the other hand, the optical signal in the upper path passes through the cascade modulator and the optical rectangular band-pass filter, and the insertion loss is larger, so that the input optical wave with larger power is also needed.
In summary, the arrangement of the structure gives consideration to the defect that the difference loss of the upper path and the lower path is relatively large, so that the power difference of the beat frequency signals is not very large, the optical power ratio is reduced, the quality of the beat frequency millimeter waves is improved, no complex filter device is used, and the cost is reduced.
The invention provides an optical signal transmitting end, which comprises a laser, an optical power divider, a local oscillator signal generating module, an optical carrier modulator, a band-pass filter, a baseband data generating module, a baseband data modulator and an optical coupler, wherein the laser is connected with the input end of the optical power divider, the first output end of the optical power divider is connected with the optical carrier modulator, and the second output end of the optical power divider is connected with the baseband data modulator; the optical carrier modulator is also respectively connected with the local oscillation signal output module and the band-pass filter; the baseband data modulator is also connected with the baseband data generation module; the optical couplers are respectively connected with the band-pass filter and the baseband data modulator.
Therefore, the optical power divider is arranged at the output end of the laser, on one hand, compared with the wavelength selective switch, the optical power divider is cheaper in price and low in cost, and on the other hand, the optical power divider can divide the original light wave output by the laser according to the preset proportion, so that a light wave with higher power is directly provided for a baseband data modulator in one light path for baseband data modulation, the insertion loss of the modulator and a filter in the other light path is also considered, and the light wave is provided for the modulators in the two latter paths in a relatively balanced manner, so that the power of two light signals coupled by the optical coupler is relatively balanced, the light power ratio is reduced, and the quality of millimeter waves is improved.
Referring to fig. 7, fig. 7 is a schematic structural diagram of a millimeter wave optical-carrier wireless communication system provided by the present invention, where the system includes an optical signal transmitting end a, and the optical signal transmitting end a is used for generating an optical signal, and the millimeter wave optical-carrier wireless communication system further includes an optical fiber B for transmitting the optical signal and a photodetector C for beating the optical signal to obtain millimeter waves.
For the description of the millimeter wave optical carrier wireless communication system, refer to the above embodiments, and the description of the present invention is omitted herein.
It should be noted that in this specification the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (9)
1. The utility model provides an optical signal transmitting terminal which characterized in that includes laser instrument, optical power divider, local oscillator signal generation module, optical carrier modulator, band-pass filter, baseband data generation module, baseband data modulator and optical coupler, wherein:
the first output end of the optical splitter is connected with the optical carrier modulator, the second output end of the optical splitter is connected with the baseband data modulator, and the optical splitter is used for splitting the original light wave output by the laser according to a preset proportion to obtain a first original light wave and a second original light wave, outputting the first original light wave to the optical carrier modulator and outputting the second original light wave to the baseband data modulator;
the optical carrier modulator is further connected with the local oscillator signal output module and the band-pass filter respectively, the local oscillator signal output module is used for outputting local oscillator signals to drive the optical carrier modulator, and the optical carrier modulator is used for modulating the first original light waves to obtain a plurality of optical carriers; the band-pass filter is used for filtering the plurality of optical carriers to obtain an unmodulated first optical carrier;
the baseband data modulator is further connected with the baseband data generating module and is used for modulating the baseband data output by the baseband data generating module according to the second original light wave to obtain a modulated second optical carrier;
the optical coupler is respectively connected with the band-pass filter and the baseband data modulator and is used for carrying out optical coupling on the first optical carrier and the second optical carrier to obtain optical signals, and millimeter waves are obtained through beat frequency.
2. The optical signal transmitting terminal of claim 1, wherein the optical carrier modulator is a first lithium niobate mach-zehnder modulator and a second lithium niobate mach-zehnder modulator connected.
3. The optical signal transmitting terminal according to claim 2, wherein the local oscillator signal generating module includes:
a local oscillator for generating an original local oscillator signal;
the input end of the electric amplifier is connected with the local oscillator, and the output end of the electric amplifier is connected with the input end of the first electric power divider, and the electric amplifier is used for amplifying the original local oscillator signal to obtain an amplified local oscillator signal;
the first output end of the first electric power divider is connected with the input end of the second electric power divider, the second output end of the first electric power divider is connected with the input end of the third electric power divider, the first output end of the second electric power divider is directly connected with the first lithium niobate Mach-Zehnder modulator, and the second output end of the second electric power divider is connected with the first lithium niobate Mach-Zehnder modulator through a first electric phase shifter; the first output end of the third electric power divider is directly connected with the second lithium niobate Mach-Zehnder modulator, and the second output end of the third electric power divider is connected with the second lithium niobate Mach-Zehnder modulator through a second electric phase shifter;
the first electric power divider is used for carrying out electric power division on the amplified local oscillation signals to obtain first local oscillation signals and second local oscillation signals, the second electric power divider is used for carrying out electric power division on the first local oscillation signals to obtain third local oscillation signals and fourth local oscillation signals, the third local oscillation signals are directly output to the upper arm of the first lithium niobate Mach-Zehnder modulator, the fourth local oscillation signals are output to the lower arm of the first lithium niobate Mach-Zehnder modulator after being subjected to phase deviation of the first electric phase deviation device, the third electric power divider is used for carrying out electric power division on the second local oscillation signals to obtain fifth local oscillation signals and sixth local oscillation signals, the fifth local oscillation signals are directly output to the upper arm of the second lithium niobate Mach-Zehnder modulator, and the sixth oscillation signals are output to the lower arm of the second lithium niobate Mach-Zehnder modulator after being subjected to phase deviation of the second electric phase deviation device.
4. The optical signal transmitting terminal of claim 3, wherein the baseband data modulator is an I-Q quadrature modulator.
5. The optical signal transmitting terminal according to claim 4, wherein the baseband data generating module comprises:
a pulse generator for generating a pseudo-random non-return to zero code;
the quadrature amplitude modulation mapper is connected with the pulse generator and is used for carrying out quadrature amplitude modulation processing on the pseudo-random non-return-to-zero code to obtain real part and imaginary part signals;
the Orthogonal Frequency Division Multiplexing (OFDM) modulator is connected with the orthogonal amplitude modulation mapper and is used for carrying out serial-parallel conversion and fast Fourier transform processing on the real part and the imaginary part signals to obtain real part and imaginary part OFDM signals;
the first low-pass filter ELPF is respectively connected with the OFDM modulator and the I-Q orthogonal modulator and is used for carrying out low-pass filtering processing on the OFDM signal with the real part to obtain first baseband data, and sending the first baseband data to the I-Q orthogonal modulator;
and the second ELPF is respectively connected with the OFDM modulator and the I-Q orthogonal modulator and is used for carrying out low-pass filtering processing on the OFDM signal with the imaginary part to obtain second baseband data, and sending the second baseband data to the I-Q orthogonal modulator.
6. The optical signal transmitting terminal according to any one of claims 1 to 5, wherein the division ratio of the optical splitter is 90%:10%, and wherein the power ratio of the first original optical wave to the second original optical wave is 9:1.
7. the optical signal transmitting terminal of claim 6, wherein the optical signal transmitting terminal further comprises:
and the erbium-doped fiber amplifier is connected with the optical coupler and is used for amplifying the optical signal.
8. The optical signal transmitting terminal of claim 6, wherein the frequency interval between the first optical carrier and the second optical carrier is 60GHz.
9. A millimeter wave optical carrier wireless communication system, comprising an optical signal transmitting end according to any one of claims 1-8, wherein the optical signal transmitting end is used for generating an optical signal, and the millimeter wave optical carrier wireless communication system further comprises an optical fiber for transmitting the optical signal and a photodetector for beating the optical signal to obtain millimeter waves.
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