CN110166118B - Dual-band optical carrier radio frequency link system and transmission method thereof - Google Patents

Dual-band optical carrier radio frequency link system and transmission method thereof Download PDF

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CN110166118B
CN110166118B CN201910454484.XA CN201910454484A CN110166118B CN 110166118 B CN110166118 B CN 110166118B CN 201910454484 A CN201910454484 A CN 201910454484A CN 110166118 B CN110166118 B CN 110166118B
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高永胜
徐航
谭庆贵
王欣悦
赵雪芳
樊养余
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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
    • H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
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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
    • 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
    • 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
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Abstract

The invention provides a dual-band optical radio frequency link system and a transmission method thereof.A laser source output end is connected with an optical input end of a DEMZM, a low-frequency radio frequency signal is input into an upper arm radio frequency port of the DEMZM, a high-frequency radio frequency signal is input into a lower arm radio frequency port of the DEMZM, an optical fiber and an optical power divider are sequentially connected with a DEMZM output end, one of two output ends of the optical power divider recovers an original low-frequency radio frequency signal through a low-frequency electric band-pass filter after passing through a low-speed photoelectric detector, and the other output end recovers the original high-frequency radio frequency signal through a high-frequency electric band-pass filter after passing through a high-speed photoelectric detector. The invention transmits two low-frequency and high-frequency radio frequency signals on a single RoF channel in a multiplexing way, fully utilizes the frequency band resource of the optical fiber and reduces the system cost. The invention has simple structure and strong operability; the signal transmission requirements of applications such as 5G communication and the like are met, the physical link cost is saved, and the frequency band utilization rate is improved.

Description

Dual-band optical carrier radio frequency link system and transmission method thereof
Technical Field
The invention relates to the technical field of optical fiber communication, in particular to an optical carrier radio frequency link system.
Background
Radio frequency signals are large in loss in the atmosphere and cables, and are not suitable for long-distance transmission. The optical fiber has the advantages of low loss, large bandwidth, no electromagnetic interference, portability and the like, so that an optical radio frequency (RoF) link is constructed, and the effective transmission of radio frequency signals through the optical fiber can be realized.
The simultaneous transmission of radio frequency signals of two frequency bands of low-frequency radio frequency and high-frequency radio frequency in 5G communication application is a difficult problem. The dual-band radio frequency signals are realized in an electric domain, and radio frequency devices such as a large-bandwidth coupler and the like are required to be used in a link, so that the cost of the link is very high; the existing RoF link can only transmit radio frequency signals of a single frequency band generally, and the frequency band utilization rate is low. By constructing a dual-band RoF link, the optical fiber transmission of radio frequency signals of two frequency bands of low-frequency radio frequency and high-frequency radio frequency is realized simultaneously, the frequency band utilization rate and the transmission quality can be improved, and the physical link cost is saved.
Disclosure of Invention
In order to overcome the defects of the prior art, fully utilize frequency band or time resources of a channel and improve the utilization rate of the channel, the invention provides a dual-band optical carrier radio frequency link system and a transmission method thereof.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a dual-band optical carrier radio frequency link system comprises a laser, a dual-electrode sigma-delta modulator (DEMZM), an optical fiber, an optical power divider, a low-speed photoelectric detector and a high-speed photoelectric detector; the DEMFM is provided with an upper arm and a lower arm which are parallel, and each arm is provided with a radio frequency port and a direct current port; the output end of the laser source is connected with the optical input end of the DEMFM, a low-frequency radio-frequency signal is input into the upper arm radio-frequency port of the DEMFM, a high-frequency radio-frequency signal is input into the lower arm radio-frequency port of the DEMFM, the output end of the DEMFM is sequentially connected with the optical fiber and the optical power divider, one of two output ends of the optical power divider passes through the low-speed photoelectric detector and then recovers the original low-frequency radio-frequency signal through the low-frequency electric band-pass filter, and the other output end of the optical power divider passes through the high-speed photoelectric detector and then recovers the original high-frequency radio-frequency signal through the high-frequency electric band-pass filter.
The transmission method of the dual-band optical carrier radio frequency link system comprises the following steps:
the low frequency rf signal input to the DEMZM upper arm is represented as: vupper(t)＝VRF1cos(ωRF1t) in which VRF1For low frequency RF signal amplitude, omegaRF1For low frequency RF signal angular frequency, the DC bias voltage input to the upper arm of the DEMZM is represented as VDC1；
The high frequency rf signal input to the lower DEMZM arm is represented as: vlower(t)＝VRF2cos(ωRF2t) in which VRF2For high frequency radio frequency signal amplitude, omegaRF2The DC bias voltage input to the lower arm of DEMFM is denoted V for the angular frequency of the high frequency RF signalDC2；
Let the optical signal input to DEMZM be denoted as EcAfter being modulated by low-frequency and high-frequency radio-frequency signals through DEMm, the DEMm outputThe optical signal is expressed as:
Figure BDA0002076162300000021
wherein alpha isMZMIndicating the insertion loss, V, of the modulatorπ,RFIs the radio frequency half-wave voltage of the modulator;
Figure BDA0002076162300000022
the phase shift introduced for the upper arm dc bias,
Figure BDA0002076162300000023
phase shift introduced for DC bias of lower arm, Vπ,DCFor the half-wave DC voltage of the modulator, Jn(m1,2) Is at m1And m2N-order Bessel function of the first kind, n being an integer; wherein
Figure BDA0002076162300000024
In order to modulate the index for the low frequency signal,
Figure BDA0002076162300000025
is a high frequency signal modulation index; when m is1,2Far less than 1, i.e. under the condition of small signal modulation, the high-order Bessel function value is approximately 0, and m is taken1＝m2Then, equation (1) is simplified as:
Figure BDA0002076162300000026
the signal is transmitted through optical fiber, and after passing through the optical power splitter, the two paths of optical signals pass through the photoelectric detectors respectively to obtain photocurrent:
Figure BDA0002076162300000031
wherein, γPD(f) Is the frequency responsivity of the photodetector; the formula (3) shows that the light passes through the photoelectric deviceThe first term of the output signal after the detector is direct current, the second term is a low-frequency signal, the third term is a high-frequency signal, the fourth term is a sum frequency term of the low-frequency signal and the high-frequency signal, and the fifth term is a difference frequency term of the low-frequency signal and the high-frequency signal; the low-frequency radio-frequency signal can be recovered by using the low-speed photoelectric detector and the low-frequency electric band-pass filter, and the high-frequency radio-frequency signal can be recovered by using the high-speed photoelectric detector and the high-frequency electric band-pass filter.
The invention has the beneficial effects that a dual-band RoF link is adopted, and the frequency division multiplexing is realized by applying radio frequency signals of different frequency bands to two arms of the DEMFM for modulation. The invention transmits the low-frequency and high-frequency radio frequency signals of two independent and different frequency bands on a single RoF channel in a multiplexing way, fully utilizes the frequency band resource of the optical fiber and reduces the system cost. The invention has simple structure and strong operability; the signal transmission requirements of applications such as 5G communication and the like are met, the physical link cost is saved, and the frequency band utilization rate is improved.
Drawings
Fig. 1 is a schematic diagram of a dual-band radio-over-optical link according to the present invention.
Fig. 2 is a graph of the gain variation of the 3.5GHz channel of the present invention under the condition of the input power variation.
FIG. 3 is a schematic diagram of the Spurious Free Dynamic Range (SFDR) of the 3.5GHz channel of the present invention.
Fig. 4 is a graph of the gain variation of the 28GHz channel of the present invention under varying input power.
FIG. 5 is a diagram of the SFDR of the 28GHz channel of the present invention.
Detailed Description
The invention is further illustrated with reference to the following figures and examples.
A dual-band optical carrier radio frequency link system comprises a laser, a dual-electrode sigma-delta modulator (DEMZM), an optical fiber, an optical power divider, a low-speed photoelectric detector and a high-speed photoelectric detector; the DEMFM is provided with an upper arm and a lower arm which are parallel, and each arm is provided with a radio frequency port and a direct current port; the output end of the laser source is connected with the optical input end of the DEMFM, a low-frequency radio-frequency signal is input into the upper arm radio-frequency port of the DEMFM, a high-frequency radio-frequency signal is input into the lower arm radio-frequency port of the DEMFM, the output end of the DEMFM is sequentially connected with the optical fiber and the optical power divider, one of two output ends of the optical power divider passes through the low-speed photoelectric detector and then recovers the original low-frequency radio-frequency signal through the low-frequency electric band-pass filter, and the other output end of the optical power divider passes through the high-speed photoelectric detector and then recovers the original high-frequency radio-frequency signal through the high-frequency electric band-pass filter.
The transmission method of the dual-band optical carrier radio frequency link system comprises the following steps:
the low frequency rf signal input to the DEMZM upper arm is represented as: vupper(t)＝VRF1cos(ωRF1t) in which VRF1For low frequency RF signal amplitude, omegaRF1For low frequency RF signal angular frequency, the DC bias voltage input to the upper arm of the DEMZM is represented as VDC1；
The high frequency rf signal input to the lower DEMZM arm is represented as: vlower(t)＝VRF2cos(ωRF2t) in which VRF2For high frequency radio frequency signal amplitude, omegaRF2The DC bias voltage input to the lower arm of DEMFM is denoted V for the angular frequency of the high frequency RF signalDC2；
Let the optical signal input to DEMZM be denoted as EcAfter the DEMFM is modulated by the low-frequency and high-frequency radio frequency signals, the optical signal output by the DEMFM is expressed as:
Figure BDA0002076162300000041
wherein alpha isMZMIndicating the insertion loss, V, of the modulatorπ,RFIs the radio frequency half-wave voltage of the modulator;
Figure BDA0002076162300000042
the phase shift introduced for the upper arm dc bias,
Figure BDA0002076162300000043
phase shift introduced for DC bias of lower arm, Vπ,DCFor the half-wave DC voltage of the modulator, Jn(m1,2) Is at m1And m2N-order Bessel function of the first kind, n being an integer; wherein
Figure BDA0002076162300000044
In order to modulate the index for the low frequency signal,
Figure BDA0002076162300000045
is a high frequency signal modulation index; when m is1,2Far less than 1, i.e. under the condition of small signal modulation, the high-order Bessel function value is approximately 0, and m is taken1＝m2Then, equation (1) is simplified as:
Figure BDA0002076162300000046
the signal is transmitted through optical fiber, and after passing through the optical power splitter, the two paths of optical signals pass through the photoelectric detectors respectively to obtain photocurrent:
Figure BDA0002076162300000051
wherein, γPD(f) Is the frequency responsivity of the photodetector; it can be seen from formula (3) that the first term of the output signal after passing through the photodetector is dc, the second term is a low frequency signal, the third term is a high frequency signal, the fourth term is a sum frequency term of the low frequency signal and the high frequency signal, and the fifth term is a difference frequency term of the low frequency signal and the high frequency signal; the low-frequency radio-frequency signal can be recovered by using the low-speed photoelectric detector and the low-frequency electric band-pass filter, and the high-frequency radio-frequency signal can be recovered by using the high-speed photoelectric detector and the high-frequency electric band-pass filter.
As shown in fig. 1, the dual-band radio frequency over optical link system includes a laser, a DEMZM, an optical fiber, an optical power splitter, a low-speed photodetector, a low-frequency electric bandpass filter, a high-speed photodetector, and a high-frequency electric bandpass filter. An optical signal output by a laser is input to an optical signal input end of the DEMZM, a low-frequency radio-frequency signal and a high-frequency radio-frequency signal are respectively input to an upper arm radio-frequency input port and a lower arm radio-frequency input port of the DEMZM, the modulated optical signal is connected with one end of an optical fiber from an output end of the DEMZM, the other end of the optical fiber is connected to an input end of an optical power splitter, and two output ends of the optical power splitter are respectively connected with a high-speed photoelectric detector and a low-speed photoelectric detector. The DEMm used consists of two waveguides, two radio-frequency electrodes and two direct-current electrodes. The phase modulation of light is realized through the electro-optic effect of the two lithium niobate crystals, then the two light signals are subjected to correlation interference, and the phase difference of the two light signals can be changed through the phase difference of direct-current bias voltage.
The device in the embodiment comprises: the device comprises a laser, a DEMZM, a direct current voltage source, two microwave signal sources, an optical power splitter, a standard single-mode fiber, two electric filters and a frequency spectrograph. The output port of the laser is connected with the optical input port of the DEMZM through an optical fiber, the output ends of two microwave signal sources are respectively connected to the upper and lower arm radio frequency signal input ends of the DEMZM, the direct current bias of the modulator is provided by a direct current voltage source, the output end of the modulator is sequentially connected with a standard single mode optical fiber, an optical power divider and two photoelectric detectors, and the electric signals output by the two photoelectric detectors are measured through a frequency spectrograph.
Selecting an optical carrier wave generated by a laser source to be 1551.8nm, wherein the optical power is 10 dBm; one microwave signal source generates a low-frequency radio-frequency signal with the center frequency of 3.5GHz, and the other microwave signal source generates a high-frequency radio-frequency signal with the center frequency of 28 GHz; the half-wave voltage of the DEMFM is 5V, the bandwidth is more than 30GHz, and the extinction ratio is 30 dB; the 3dB response bandwidth of the two photoelectric detectors is 43GHz, and the responsivity is 0.6A/W; the length of the standard single-mode optical fiber is 20 kilometers; the center frequency of the low-frequency electric band-pass filter is 3.5G, the bandwidth is 300MHz, the center frequency of the high-frequency electric band-pass filter is 28G, and the bandwidth is 300 MHz; adjusting the DC offset V of a sigma-delta modulatorDC1And VDC2By operating the sigma-delta modulator at an orthogonal point, i.e. by
Figure BDA0002076162300000061
(1) The transmission gain of the 3.5GHz low frequency channel was tested. Changing the power of the input radio-frequency signal of the 3.5GHz channel, wherein the change range is-20 dBm to 20dBm, comparing the power of the 3.5GHz signal output by the photoelectric detector and the low-frequency electric band-pass filter with the power of the input signal, and calculating the transmission gain of the low-frequency channel, wherein the transmission gain is-20.8 dB in a linear region with small input power of the radio-frequency signal as shown in figure 2;
(2) the SFDR of the 3.5GHz low frequency channel was tested. Inputting double-tone low-frequency signals into the upper arm, wherein the frequency is 3.5GHz and 3.6GHz, the total power change range is-20 dB to 20dBm, measuring output fundamental frequency power, noise power and third-order intermodulation power, and calculating the SFDR of the low-frequency channel as 105.03dB Hz2/3As in fig. 3;
(3) the transmission gain of the 28GHz high frequency channel was tested. Changing the power of an input signal of a 28GHz channel, wherein the change range is-20 dBm to 20dBm, comparing the power of the signal output by the photoelectric detector and the high-frequency electric band-pass filter with the power of the input signal, and calculating the transmission gain of a high-frequency channel, wherein the transmission gain is-20.8 dB in a linear region with small input power of a radio-frequency signal as shown in figure 4;
(4) the SFDR of the 28GHz high frequency channel was tested. Loading a double-tone high-frequency signal to the lower arm, wherein the frequency is 28GHz and 28.1GHz, the total power change range is-20 dBm to 20dBm, measuring output fundamental frequency power, noise power and third-order intermodulation power, and calculating the SFDR of the high-frequency channel as 104.83dB Hz2/3As in fig. 5.
In summary, the dual-band optical radio-frequency link and the operation method thereof of the invention are simple and easy to implement, have high frequency band utilization rate, and have good transmission gain and SFDR of each frequency band.
In conclusion, the above-described embodiments are merely 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 variations and substitutions can be made on the disclosure of the present invention, and the rf frequency, the optical carrier wavelength, the optical carrier power, the optical fiber length, etc. 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 (2)

1. A dual-band radio over optical link system, comprising:
the dual-band optical carrier radio frequency link system comprises a laser, a dual-electrode amplification modulator, an optical fiber, an optical power divider, a low-speed photoelectric detector and a high-speed photoelectric detector; the dual-electrode sigma-delta modulator is provided with an upper arm and a lower arm which are parallel, and each arm is provided with a radio frequency port and a direct current port; the output end of the laser source is connected with the optical input end of the double-electrode sigma-delta modulator, a low-frequency radio-frequency signal is input into the upper arm radio-frequency port of the double-electrode sigma-delta modulator, a high-frequency radio-frequency signal is input into the lower arm radio-frequency port of the double-electrode sigma-delta modulator, the output end of the double-electrode sigma-delta modulator is sequentially connected with the optical fiber and the optical power divider, one of two output ends of the optical power divider passes through the low-speed photoelectric detector and then recovers the original low-frequency radio-frequency signal through the low-frequency band-pass filter, and the other output end of the optical power divider passes through the high-speed photoelectric detector and then recovers the original high-frequency radio-frequency signal through the high-frequency band-pass filter.
2. A transmission method using the dual band radio over optical link system of claim 1, comprising the steps of:
the low-frequency radio-frequency signal input to the upper arm of the two-electrode sigma-delta modulator is expressed as: vupper(t)＝VRF1cos(ωRF1t) in which VRF1For low frequency RF signal amplitude, omegaRF1For low frequency RF signal angular frequency, the DC bias voltage input to the upper arm of the dual-electrode sigma-delta modulator is represented as VDC1；
The high frequency rf signal input to the lower arm of the two-electrode sigma-delta modulator is represented as: vlower(t)＝VRF2cos(ωRF2t) in which VRF2For high frequency radio frequency signal amplitude, omegaRF2For high frequency RF signal angular frequency, the DC bias voltage input to the lower arm of the dual-electrode sigma-delta modulator is denoted as VDC2；
Let the optical signal input to the two-electrode sigma-delta modulator be denoted as EcAfter the dual-electrode sigma-delta modulator is modulated by low-frequency and high-frequency radio-frequency signals, the optical signal output by the dual-electrode sigma-delta modulator is expressed as follows:
Figure FDA0003503991270000011
wherein，αMZMIndicating the insertion loss, V, of the modulatorπ,RFIs the radio frequency half-wave voltage of the modulator;
Figure FDA0003503991270000012
the phase shift introduced for the upper arm dc bias,
Figure FDA0003503991270000013
phase shift introduced for DC bias of lower arm, Vπ,DCFor the half-wave DC voltage of the modulator, Jn(m1,2) Is at m1And m2N-order Bessel function of the first kind, n being an integer; wherein
Figure FDA0003503991270000021
In order to modulate the index for the low frequency signal,
Figure FDA0003503991270000022
is a high frequency signal modulation index; when m is1,2Far less than 1, i.e. under the condition of small signal modulation, the high-order Bessel function value is approximately 0, and m is taken1＝m2Then, equation (1) is simplified as:
Figure FDA0003503991270000023
the signal is transmitted through optical fiber, and after passing through the optical power splitter, the two paths of optical signals pass through the photoelectric detectors respectively to obtain photocurrent:
Figure FDA0003503991270000024
wherein, γPD(f) Is the frequency responsivity of the photodetector; it can be seen from formula (3) that the first term of the output signal after passing through the photodetector is dc, the second term is low frequency signal, the third term is high frequency signal, the fourth term is sum frequency term of low frequency signal and high frequency signal, and the fifth term is sum frequency of low frequency signal and high frequency signalA difference frequency term of the high frequency signal; the low-frequency radio-frequency signal can be recovered by using the low-speed photoelectric detector and the low-frequency electric band-pass filter, and the high-frequency radio-frequency signal can be recovered by using the high-speed photoelectric detector and the high-frequency electric band-pass filter.
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