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CN113472445B - Dual-band RoF system based on PDM-DPMZM and adjusting method - Google Patents

Dual-band RoF system based on PDM-DPMZM and adjusting method Download PDF

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CN113472445B
CN113472445B CN202110716329.8A CN202110716329A CN113472445B CN 113472445 B CN113472445 B CN 113472445B CN 202110716329 A CN202110716329 A CN 202110716329A CN 113472445 B CN113472445 B CN 113472445B
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CN113472445A (en
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高永胜
史芳静
秦晟昱
时进
樊养余
李立
谭庆贵
梁栋
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Northwestern Polytechnical University
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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
    • H04B10/25—Arrangements specific to fibre transmission
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    • H04B10/25752—Optical arrangements for wireless networks
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Abstract

The invention provides a double-frequency-band RoF system based on a PDM-DPMZM and an adjusting method. The invention realizes the separation of the low-frequency radio-frequency signal and the high-frequency radio-frequency signal through polarization control, realizes the single-sideband modulation of the high-frequency radio-frequency signal and the nonlinear distortion suppression of the low-frequency radio-frequency signal through reasonably setting the direct-current bias angle of the modulator, and finally obtains the high-performance dual-band RoF system. The invention has simple structure and strong operability; the invention has strong practicability and can be widely applied to the current 5G network deployment.

Description

Dual-band RoF system based on PDM-DPMZM and adjusting method
Technical Field
The invention relates to the technical field of optical communication and microwave, in particular to a Radio-over-Fiber (Radio-over-Fiber) system and an adjusting method.
Background
The 3.5GHz is regarded as a pioneer frequency band of a 5G network by a plurality of countries all over the world, the industrial chain is mature, and the networking cost is low. However, in order to meet the requirements of different 5G application scenarios, a full-band layout needs to be adopted for the candidate bands of the 5G system. Among them, 5G communication focuses on the application of high frequency millimeter wave to achieve the goal of high speed transmission. The 28GHz 5G high-band frequency spectrum selected by a plurality of countries has the advantage of high network speed, but has the defects of ultra-small coverage area and more cost and time for deployment. Therefore, only when 3.5GHz and 28GHz frequency band base stations are deployed at the same time, people can really experience the network speed and performance of 5G. Currently, the RoF system attracts attention in simultaneous transmission of low-frequency and high-frequency radio-frequency signals due to its inherent advantages of high frequency band, large bandwidth, low loss, and electromagnetic interference resistance.
A dual-band RoF transmission system has been reported in the industry, but the system can only realize the transmission of low-frequency radio frequency and high-frequency radio frequency signals, and cannot solve the problem of nonlinear distortion caused by a modulator during the transmission of the low-frequency radio frequency signals and the problem of periodic power fading caused by fiber dispersion during the transmission of the high-frequency radio frequency signals over a long-distance optical fiber link.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a dual-band RoF system based on a PDM-DPMZM and an adjusting method. The invention realizes a high-performance Dual-band RoF system by utilizing a Polarization Multiplexing double Parallel Mach-Zehnder Modulator (PDM-DPMZM), an electric phase shifter, an electric power splitter, an optical beam splitter, a Polarization Controller (PC), a Polarizer (Polarizer) and a Photoelectric Detector (PD), and can solve the problems of nonlinear distortion and power fading of low-frequency radio-frequency signals and high-frequency radio-frequency signals in the transmission process by constructing the high-performance Dual-band RoF system besides simultaneously realizing the transmission of the low-frequency radio-frequency signals and the high-frequency radio-frequency signals in optical fibers, thereby further improving the transmission quality of the signals besides improving the spectrum utilization rate and saving the cost of physical links.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a dual-band RoF system based on a PDM-DPMZM comprises a laser, a PDM-DPMZM, a 90-degree electric phase shifter, an electric power divider, a section of optical fiber, an optical beam splitter, two polarization controllers, two polarizers and two photodetectors, wherein an output port of the laser is connected with an optical input port of the PDM-DPMZM, an output port of the PDM-DPMZM is connected with an input port of the optical fiber, an output port of the optical fiber is connected with an input port of the optical beam splitter, an output port of the optical beam splitter is connected with an input port of a polarization controller 1, an output port of the polarization controller 1 is connected with an input port of a polarizer 1, and an output port of the polarizer 1 is connected with an optical input port of the photodetector 1; the other output port of the optical beam splitter is connected with the input port of the polarization controller 2, the output port of the PC2 is connected with the input port of the polarizer 2, and the output port of the polarizer 2 is connected with the optical input port of the photoelectric detector 2.
The PDM-DPMZM comprises a Y-type optical splitter, two parallel DPMZMs (marked as X-DPMZM and Y-DPMZM), a 90-degree Polarization Rotator (PR) and a Polarization Beam Combiner (PBC); the optical signal output by the Y-DPMZM modulator is subjected to 90-degree polarization rotation through PR and then is input into PBC together with the optical signal output by the X-DPMZM modulator, and the optical signal is output from the PDM-DPMZM modulator after the PBC is combined into a polarization multiplexing signal.
In the polarization multiplexing dual-parallel Mach-Zehnder modulator PDM-DPMZM, a radio frequency signal 1 (f)128GHz) are divided into two paths with equal power by the electric power divider, one path is directly connected with the radio frequency port of the sub-modulator Xa, and the other path is connected with the radio frequency port of the sub-modulator Xb after passing through the 90-degree electric phase shifter; radio frequency signal 2 (f)23.5GHz) is directly connected to the radio frequency port of the sub-modulator Yb, the sub-modulator Ya is left empty; the X-DPMZM works at a negative quadrature point, the Yb and the Y-DPMZM both work at a maximum point, a radio frequency signal 1 modulated on the X-DPMZM and a radio frequency signal 2 modulated on the Y-DPMZM are respectively positioned on laser beams with orthogonal polarization states, and the two laser beams are not influenced by each other.
The invention also provides a PDM-DPMZM-based adjusting method of the dual-band RoF system, which comprises the following detailed steps:
the expressions of the radio frequency signal 1 and the radio frequency signal 2 are respectively VRF1(t)＝VRF1sin(ωRF1t) and VRF2(t)＝VRF2sin(ωRF2t) wherein VRF1And VRF2Amplitude, omega, of the radio-frequency signal 1 and the radio-frequency signal 2, respectivelyRF1And ωRF2The angular frequencies of the rf signal 1 and the rf signal 2, respectively, the expression of the PDM-DPMZM output optical signal is:
Figure BDA0003134518460000031
wherein, Ec(t) is a laser output signal; μ is modulator loss;
Figure BDA0003134518460000032
and
Figure BDA0003134518460000033
the dc bias angles of the sub-modulators Xa, Xb, Ya and Yb, respectively,
Figure BDA0003134518460000034
and
Figure BDA0003134518460000035
main bias angles of the X-DPMZM and the Y-DPMZM respectively; m is1And m2The modulation indexes of the radio frequency signal 1 and the radio frequency signal 2 to the modulator respectively;
Figure BDA0003134518460000036
and
Figure BDA0003134518460000037
unit vectors representing the TE mode and TM mode of the light field respectively; j. the design is a squaren(. -) represents a first class of nth order Bessel functions, and high order sidebands can be ignored under small signal modulation; by setting up
Figure BDA0003134518460000038
And enabling the X-DPMZM to output a single sideband modulation signal.
After the output signal of the PDM-DPMZM passes through an optical fiber with the length of L, the expression is as follows:
Figure BDA0003134518460000039
wherein alpha isSMFIs the attenuation coefficient of the optical fiber; theta is the phase shift introduced by the second-order dispersion to the first-order optical sideband of the modulation signal; beta is a2(ωc) Is the second-order propagation coefficient, omega, of the laser signalcFor the angular frequency of the laser signal, at the same time, set
Figure BDA00031345184600000310
An optical signal output by the optical fiber is divided into two beams with equal power by an optical beam splitter, polarization control is carried out on the two beams by a polarization controller and a polarizer in sequence, polarized light only containing a radio-frequency signal 1 and polarized light only containing a radio-frequency signal 2 are obtained respectively, the polarized light only containing the radio-frequency signal 1 is input into a high-speed PD (PD1), the polarized light only containing the radio-frequency signal 2 is input into a low-speed PD (PD2), and a photocurrent, i, is obtainedPD1Is the demodulated photocurrent i of the polarized light only containing the radio frequency signal 1 after entering the PD1PD2The photocurrent obtained by demodulating the polarized light only containing the radio frequency signal 2 after entering the PD2 is respectively:
Figure BDA0003134518460000041
Figure BDA0003134518460000042
wherein, γPDIs the responsivity of the photodetector; according to the formula (3), the fact that the single-sideband modulation is adopted, the high-frequency radio-frequency signal obtained through final demodulation does not have the power fading phenomenon;
expanding the bezier coefficient in equation (4) and ignoring higher order terms can result:
Figure BDA0003134518460000043
can find that when
Figure BDA0003134518460000044
When, the signal i in the formula (5)PD2(t) the third order intermodulation distortion component term representing the nonlinear distortion
Figure BDA0003134518460000045
Correlation term) is eliminated and the useful base-frequency component term (m)2Related item) is retained when setting
Figure BDA0003134518460000046
The amount of nonlinear distortion represented in the formula (5) is completely eliminated, and the nonlinear distortion problem and the power fading problem of the low-frequency radio-frequency signal and the high-frequency radio-frequency signal in the transmission process are solved.
The invention has the advantages that the simultaneous modulation of the dual-band radio frequency signals is realized by utilizing an integrated PDM-DPMZM, the separation of the low-frequency radio frequency signals and the high-frequency radio frequency signals is realized by polarization control, the single-sideband modulation of the high-frequency radio frequency signals and the nonlinear distortion suppression of the low-frequency radio frequency signals are realized by reasonably setting the direct current bias angle of the modulator, and finally the high-performance dual-band RoF system is obtained. The invention has simple structure and strong operability; the invention has strong practicability and can be widely applied to the current 5G network deployment.
Drawings
FIG. 1 is a diagram of a PDM-DPMZM-based high-performance dual-band RoF system device according to the present invention.
Fig. 2 is a spectrum diagram of a 28GHz high-frequency radio frequency signal obtained after polarization control.
Fig. 3 is a frequency spectrum diagram of a 3.5GHz low-frequency radio frequency signal obtained after polarization control.
Fig. 4 is a system frequency response curve of the experimental group and the control group.
Fig. 5 shows the system dynamic range of the experimental group and the control group.
Detailed Description
The invention is further illustrated with reference to the following figures and examples. 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 protection scope of the present invention is not limited to the following embodiments:
in this example, the apparatus comprises: the device comprises a laser, a radio frequency signal source 1, a radio frequency signal source 2, a direct current source, a PDM-DPMZM, an electric splitter, a 90-degree electric phase shifter, an optical fiber, an optical beam splitter, a PC1, a PC2, Pol1, Pol2, a PD1 and a PD 2. The output end of the laser is connected with the optical input port of the PDM-DPMZM, the output end of the PDM-DPMZM is connected with the input end of the optical fiber, and the output end of the optical fiber is connected with the input end of the optical beam splitter. One output port of the optical beam splitter is connected with the input end of the PC1, the output end of the PC1 is connected with the input end of Pol1, the output end of Pol1 is connected with the PD1, and the output port of the PD1 is connected with the spectrometer; the other output port of the optical splitter is connected with the input end of the PC2, the output end of the PC2 is connected with the input end of Pol2, the output end of Pol2 is connected with the PD2, and the output port of the PD2 is connected with the spectrometer.
In this example, the method is implemented by the following steps:
the method comprises the following steps: the laser generates an optical carrier with the working wavelength of 1550nm and the optical power of 16 dBm; the radio frequency signal source 1 generates a high-frequency radio frequency signal with the frequency of 28GHz and the power of 0 dBm; the radio frequency signal source 2 generates a low-frequency radio frequency signal with the frequency of 3.5GHz and the power of 0 dBm; the half-wave voltage of the PDM-DPMZM is 3.5V, and the extinction ratio is 35 dB; the length of the optical fiber is 20 Km; the responsivities of PD1 and PD2 were both 0.7A/W.
Step two: the direct current bias angles of the four sub-modulators (Xa, Xb, Ya and Yb) of the PDM-DPMZM are set to 135 degrees, 199.2 degrees and 0 degrees respectively, and the direct current bias angles of the main modulators of the X-DPMZM and the Y-DPMZM are set to-90 degrees and 0 degrees respectively.
Step three: the polarization control angle of the PC1 is adjusted to be 0 degrees, and the tunable phase difference is arbitrary; the polarization control angle of the PC2 was adjusted to 90 °, the tunable phase difference was 0 °, and the output spectra of PD1 and PD2 were observed, respectively. Fig. 2 is a 28GHz high-frequency radio frequency signal spectrum obtained after polarization control in simulation, and fig. 3 is a 3.5GHz low-frequency radio frequency signal spectrum obtained after polarization control in simulation.
Step four: keeping the polarization control setting in the step two unchanged, changing the frequency of the high-frequency radio-frequency signal under the condition that the 3.5GHz low-frequency radio-frequency signal is normally input, and observing the power of the radio-frequency signal output by the PD 1. Meanwhile, a quadrature-biased MZM is used as a comparison group, the frequency of the high-frequency radio frequency signal is changed, and the condition of the signal power finally output is observed. Fig. 4 is a system frequency response curve of the experimental group and the control group in the simulation. It can be found that the system gain of the control group has obvious periodic fading phenomenon, while the system gain of the experimental group is relatively stable.
Step five: keeping the polarization control setting in the step two unchanged, and adjusting the low-frequency radio-frequency signal into a double-tone signal under the condition that the 28GHz high-frequency radio-frequency signal is normally input, wherein the frequency is 3.5GHz/3.6 GHz. Changing the power of an input low-frequency double-tone signal, and measuring a fundamental frequency component, an IMD3 component and noise power of a PD2 output signal; meanwhile, a quadrature-biased MZM is used as a control group to keep the frequency of the radio frequency signal unchanged. The power of the input two-tone signal is also varied and the fundamental frequency component of the PD output signal, the IMD3 component and the noise power are measured separately. FIG. 5 shows the system Dynamic ranges of the experimental group and the control group, and it can be found that the measured Spurious-Free Dynamic Range (SFDR) of the control group is 102.9dB Hz2/3The SFDR of the experimental group was 123.4dB Hz2/3. The SFDR of the experimental group was approximately 20.5dB higher than that of the control group.
In conclusion, the scheme utilizes the PDM-DPMZM to perform parallel modulation on the low-frequency radio-frequency signal and the high-frequency radio-frequency signal, and realizes independent transmission and polarization demodulation of two frequency band signals through polarization control. In the process, single-sideband modulation of high-frequency radio-frequency signals and nonlinear distortion suppression of low-frequency radio-frequency signals are achieved by setting a proper direct-current bias point. The scheme can obtain high-performance dual-band RoF transmission, has a simple structure, is easy to realize, is flexible to operate, and has potential application value in current 5G network deployment.
In summary, the above-mentioned embodiments are only examples of the present invention, and are not intended to limit the scope of the present invention, it should be noted that, for those skilled in the art, many equivalent modifications and substitutions can be made on the disclosure of the present invention, and the high frequency rf signal frequency, the low frequency rf signal frequency, the optical carrier wavelength, the optical carrier power, the fiber length, the rf signal power, the polarization control angle, the dc bias angle of the modulator, and the like can be changed. Such equivalent modifications and substitutions, as well as adjustments to the frequency range, should also be considered to be within the scope of the present invention.

Claims (1)

1. A method for adjusting a dual-band RoF system based on a PDM-DPMZM (polymer dispersed mirror-parallel Mach-Zehnder interferometer) comprises a laser, the PDM-DPMZM, a 90-degree electric phase shifter, an electric power splitter, a section of optical fiber, an optical beam splitter, two polarization controllers, two polarizers and two photodetectors, wherein an output port of the laser is connected with an optical input port of the PDM-DPMZM, an output port of the PDM-DPMZM is connected with an input port of the optical fiber, an output port of the optical fiber is connected with an input port of the optical beam splitter, an output port of the optical beam splitter is connected with an input port of a polarization controller 1, an output port of the polarization controller 1 is connected with an input port of a polarizer 1, and an output port of the polarizer 1 is connected with an optical input port of the photodetector 1; the other output port of the optical beam splitter is connected with the input port of the polarization controller 2, the output port of the polarization controller 2 is connected with the input port of the polarizer 2, and the output port of the polarizer 2 is connected with the optical input port of the photoelectric detector 2; the PDM-DPMZM comprises a Y-type optical splitter, two parallel DPMZMs, a 90-degree polarization rotator and a polarization beam combiner, wherein the X-DPMZM internally comprises two sub-modulators which are connected in parallel, the Y-DPMZM internally comprises two sub-modulators which are connected in parallel, an optical signal output by the Y-DPMZM modulator generates 90-degree polarization rotation through PR, then the optical signal and an optical signal output by the X-DPMZM modulator are input into PBC together, and the optical signal is output from the PDM-DPMZM modulator after the PBC is combined into a polarization multiplexing signal; in the polarization multiplexing double-parallel Mach-Zehnder modulator PDM-DPMZM, a radio-frequency signal 1 is divided into two paths with equal power by an electric splitter, one path is directly connected with a radio-frequency port of a sub-modulator Xa, and the other path is connected with a radio-frequency port of a sub-modulator Xb after passing through a 90-degree electric phase shifter; the radio frequency signal 2 is directly connected with the radio frequency port of the sub-modulator Yb, and the sub-modulator Ya is vacant; the X-DPMZM works at a negative quadrature point, both Yb and Y-DPMZM works at a maximum point, a radio frequency signal 1 modulated on the X-DPMZM and a radio frequency signal 2 modulated on the Y-DPMZM are respectively positioned on laser beams with orthogonal polarization states, and the two laser beams are not influenced by each other, and the method is characterized by comprising the following steps:
radio frequency signal 1 and radio frequency signal2 are respectively VRF1(t)＝VRF1sin(ωRF1t) and VRF2(t)＝VRF2sin(ωRF2t) wherein VRF1And VRF2Amplitude, omega, of the radio-frequency signal 1 and the radio-frequency signal 2, respectivelyRF1And ωRF2The angular frequencies of rf signal 1 and rf signal 2, respectively, the expression of the PDM-DPMZM output optical signal is:
Figure FDA0003655847760000021
wherein, Ec(t) is a laser output signal; μ is modulator loss;
Figure FDA0003655847760000022
and
Figure FDA0003655847760000023
the dc bias angles of the sub-modulators Xa, Xb, Ya and Yb, respectively,
Figure FDA0003655847760000024
and
Figure FDA0003655847760000025
main bias angles of X-DPMZM and Y-DPMZM, respectively; m is1And m2The modulation indexes of the radio frequency signal 1 and the radio frequency signal 2 to the modulator respectively;
Figure FDA0003655847760000026
and
Figure FDA0003655847760000027
unit vectors representing the TE mode and TM mode of the light field respectively; j. the design is a squaren(. -) represents a first class of nth order Bessel functions, ignoring high order sidebands under small signal modulation; by setting up
Figure FDA0003655847760000028
When the single-sideband modulation signal is output by the X-DPMZM;
after the output signal of the PDM-DPMZM passes through an optical fiber with the length of L, the expression is as follows:
Figure FDA0003655847760000029
wherein alpha isSMFIs the attenuation coefficient of the optical fiber; theta is the phase shift introduced by the second-order dispersion to the first-order optical sideband of the modulation signal; beta is a2(ωc) Is the second-order propagation coefficient, omega, of the laser signalcFor the angular frequency of the laser signal, at the same time, set
Figure FDA00036558477600000210
An optical signal output by the optical fiber is divided into two beams with equal power by an optical beam splitter, polarization control is carried out on the two beams by a polarization controller and a polarizer in sequence to obtain polarized light only containing a radio-frequency signal 1 and polarized light only containing a radio-frequency signal 2 respectively, the polarized light only containing the radio-frequency signal 1 is input into a PD1, the polarized light only containing the radio-frequency signal 2 is input into a PD2, and a photocurrent, iPD1Is the demodulated photocurrent i of the polarized light only containing the radio frequency signal 1 after entering the PD1PD2The photocurrent demodulated after the polarized light only containing the radio frequency signal 2 enters the PD2 is:
Figure FDA0003655847760000031
Figure FDA0003655847760000035
wherein, γPDIs the responsivity of the photodetector; the formula (3) shows that the high-frequency radio-frequency signal obtained by final demodulation does not have the power fading phenomenon due to the adoption of single-sideband modulation;
expanding the bezier coefficient in equation (4) and ignoring higher order terms can result:
Figure FDA0003655847760000032
when in use
Figure FDA0003655847760000033
When, the signal i in the formula (5)PD2(t) the third order intermodulation distortion component terms representing the nonlinear distortion are removed and the useful base frequency component terms are retained, when set
Figure FDA0003655847760000034
The amount of non-linear distortion represented in equation (5) is completely eliminated.
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CN112564811A (en) * 2020-12-13 2021-03-26 西北工业大学 Microwave photon I/Q down-conversion device with large dynamic range and adjusting method

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