CN111541492A - Multichannel expanded ultra-wideband radio-frequency channelized receiving device and implementation method - Google Patents
Multichannel expanded ultra-wideband radio-frequency channelized receiving device and implementation method Download PDFInfo
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Abstract
The invention provides a multichannel expanded ultra-wideband radio frequency channelized receiving device and a realization method thereof.A Laser Diode (LD) is divided into an upper path and a lower path, the upper path is connected with a signal optical comb generation module and then connected with a Mach Zehnder Modulator (MZM), the Mach Zehnder Modulator (MZM) is connected with WDM1, and the output end of WDM1 is divided into multiple paths; the lower path of the LD output end is connected with the IM and then connected with the OBPF, the OBPF is connected with the local oscillator optical comb generation module and then connected with the WDM2, the output end of the WDM2 is divided into multiple paths, the WDM2 and the WDM1 respectively enter the OHC, the OHC is connected with two BPDs, and the BPDs are connected with the ADC. According to the invention, an ideal 7-line optical comb is obtained by setting three direct current bias voltages in the DPMZM, and the number of comb teeth of the optical comb is easily doubled by a dual-drive cascade mode, so that the multi-channel expansion purpose of the channelized receiver is realized, and the reasonable frequency shift of the local oscillator optical comb can be changed into the same intermediate frequency in the down-conversion of each independent channel, so that the complexity of a subsequent ADC is greatly simplified, and the channelized receiver system is effectively simplified.
Description
Technical Field
The invention relates to the technical field of optical communication and microwave, and mainly utilizes the microwave photonics technology to realize the channelized reception of ultra-wideband and multi-frequency-point mixed radio-frequency signals.
Background
With the rapid development of wireless communication technology, no matter multi-service broadband communication in the civil field or electronic warfare in the military field, new challenges are provided for the receiving performance of the receiver, and the realization of indexes such as multi-form, multi-frequency point and large instantaneous receiving bandwidth becomes a necessary trend of receiver development. Because the existing analog-to-digital converter (ADC) is limited by sampling rate and bandwidth, the receiving and processing of ultra-wideband signals cannot be realized, the received ultra-wideband signals can be divided into a plurality of sub-channels by the channelized receiver, each sub-channel independently realizes down-conversion and then is processed by the ADC, the processing pressure of the ADC is greatly reduced, and the simultaneous receiving and processing of ultra-wideband and multi-frequency-point signals can be effectively realized. The traditional channelized receiver is limited by various electronic bottlenecks such as electromagnetic interference, large power consumption, large volume and mass of electronic devices and the like, and the development requirement of future ultra-wideband communication is difficult to meet. Microwave photons are used as a new subject, and the advantages of large instantaneous bandwidth, strong anti-electromagnetic interference capability, small volume and light weight of photoelectric devices and the like of photonics can be combined with a channelized receiver, so that the performance of the channelized receiver is effectively and further improved. Microwave optical sub-channelized receivers have become a research hotspot.
Most of the reported microwave optical sub-channelized receivers adopt a channelized receiving scheme of an optical frequency comb, in the scheme, factors such as the comb tooth number and the flatness of the optical frequency comb directly influence the receiving performance of the channelized receiver, the optical frequency comb with a large number of comb teeth and good flatness is difficult to take into account, the flatness with the large number of comb teeth is poor, the comb tooth number with the ideal flatness is small, and the problem of expansion of the channel number of the channelized receiver is solved.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides an ultra-wideband radio-frequency channelized receiving device with multiple channels expanded and an implementation method thereof. The invention provides an ultra-wideband radio frequency signal receiving device which utilizes parallel double-parallel-Mach modulator (DPMZM) cascade and Wavelength Division Multiplexer (WDM) to realize multi-channel expansion, only two DPMZMs are needed to realize generation of 49-wire ideal optical frequency comb, not only the comb teeth are large in number and good in flatness, but also the comb teeth interval of the optical frequency comb is flexible and adjustable, and the reconfiguration of the working range of a channelized receiver can be flexibly realized by matching with the specific parameters of the corresponding WDM. Therefore, the invention effectively solves the problem that the number of the sub-channels which can be used for receiving different signals simultaneously is limited in the current channelized receiver, greatly improves the instantaneous receiving bandwidth of the receiver and has stronger practical value and significance.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a multichannel expanded ultra-wideband radio frequency channelized receiving device comprises a Laser Diode (LD), a Parallel double-amplifier Modulator (DPMZM), a radio frequency signal source (RF), a local oscillator signal source (LO), an Intensity Modulator (IM), an optical bandpass filter (OBPF), a amplifier Modulator (MZM), a Wavelength Division Multiplexer (WDM), an optical orthogonal coupler (OHC) and a balance detector (BPD); the LD output end is divided into an upper path and a lower path, the upper path is connected with the input end of the signal optical comb generation module, and the output end of the signal optical comb generation module is connected with the input end of the MZM; the broadband radio frequency signal RF3 is loaded on the radio frequency input end of the MZM, the output end of the MZM is connected with the input end of the WDM1, and the output end of the WDM1 is divided into multiple paths; the down-path of the LD output end is connected with the input end of the IM, the output end of the IM is connected with the input end of the OBPF, the output end of the OBPF is connected with the local oscillation optical comb generation module, the output end of the local oscillation optical comb generation module is connected with the input end of the WDM2, the output end of the WDM2 is divided into multiple paths, each branch of the WDM2 output end is respectively used as an input signal to enter different OHCs after being in one-to-one correspondence with each branch of the WDM1 output end, that is, WDM1 and WDM2 divide the received 49 optical combs into 49 independent frequency channels at frequency intervals, the first channel in WDM1 and the first channel in WDM2 are combined to enter the OHC as input signals, the second channel in WDM1 and the second channel in WDM2 are combined at a time to enter another OHC as another set of input signals, and by parity of reasoning, the output end of the OHC is connected with two BPDs, one BPD demodulates the I-path signal, the other BPD demodulates the Q-path signal, and the output end of the BPD is connected with the ADC.
In the signal optical comb generation module, two DPMZMs are cascaded and are respectively DPMZM1 and DPMZM2, each DPMZM is composed of two parallel MZMa and MZMb and an independent direct current bias voltage Vc, each DPMZM is only provided with one radio frequency input port MZMaMZ connected with a radio frequency signal source, and the other radio frequency input port MZMb is unloaded; the radio frequency input end MZMa of the DPMZM1 is connected with a radio frequency signal RF1, the radio frequency input end MZMa of the DPMZM2 is connected with a radio frequency signal RF2, the output end of the DPMZM1 is connected with the input end of the DPMZM2, and the output end of the DPMZM2 is connected with the input end of the DPMZM;
in the local oscillator optical comb module, two DPMZMs are cascaded and are respectively DPMZM1 and DPMZM2, each DPMZM is composed of two parallel MZMa and MZMb and an independent direct current bias voltage Vc, each DPMZM is only provided with one radio frequency input port MZMa connected with a radio frequency signal source, and the other radio frequency input port MZMb is unloaded; local oscillator signal LO1The local oscillator signal LO is connected with a radio frequency input end MZMa in the DPMZM3, and a radio frequency input end in the DPMZM42The output of DPMZM3 is connected to the input of DPMZM4, and the output of DPMZM4 is connected to the input of WDM 2.
The invention also provides a method for realizing the multichannel expanded ultra-wideband radio-frequency channelized receiving device, which comprises the following steps:
step 1: the single-carrier laser output by the laser source is represented as: ein(t)＝E0exp(jωct), the two radio frequency signals RF1 and RF2 generated by the radio frequency signal source are respectively represented as: s (t)1＝V1sin(ω1t)，s(t)2＝V2sin(ω2t) in which E0Is the electric field strength, ω, of the optical carriercBeing angular frequency of the optical carrier, s (t)1And s (t)2For two radio frequency signals, V1、V2Other than the amplitude, omega, of the two radio-frequency signals1、ω2The angular frequencies of the two radio frequency signals, respectively;
step 2: the single-carrier laser output by the LD is input to the optical input port of the DPMZM1 in the uplink, the radio frequency signal RF1 output by the radio frequency signal source is input to the radio frequency input port of the DPMZM1, and the output of the DPMZM1 is expressed as:
wherein A ═ π V1a/2Vπ，B＝πV0/2Vπ，VπDenotes the half-wave voltage of MZM or DPMZM, f denotes the frequency of RF1, V0Is the voltage, V, of the applied radio frequency signal RF11aIs the DC bias, V, of the MZMa of DPMZM11bIs the DC bias, V, of the MZMb of DPMZM11cIs the main DC bias of the DPMZM, Jn(x) Representing Bessel function of nth order when satisfied
Obtaining an ideal 7-line optical comb, carrying out equation simultaneous on the formulas (1) and (2), and then calculating to obtain V when the 7-line optical comb is generated1a、V1b、V1cA value of (d);
and step 3: the 7-line optical comb output by the DPMZM1 enters an optical input port of the DPMZM2, a radio frequency signal RF2 output by a radio frequency signal source is input to a radio frequency input port of the DPMZM2, and each direct current bias voltage V in the DPMZM2 is set in the same way2a、V2b、V2cEach optical comb output by the DPMZM1 is modulated again to form a 7-line optical comb as a new optical carrier, and the frequency value of the input RF signal RF2 is RF1
Otherwise, comb aliasing occurs to influence the modulation effect of the broadband signal, so that the DPMZM2 outputs a 49-wire signal optical comb;
and 4, step 4: the 49-wire signal optical comb output by the DPMZM2 enters the MZM, a broadband radio frequency signal RF3 in the MZM modulates the 49-wire signal optical comb, and the direct current bias voltage of the MZM is set to enable the MZM to work at a minimum transmission point to perform double-sideband modulation of carrier suppression;
and 5: each modulated signal output by the MZM enters WDM1 and is divided into independent sub-channels;
step 6: the single carrier laser output by LD is input into the light input port of IM in the down-path, the RF input port of IM inputs a frequency fdThe single-tone signal sets the DC bias voltage of IM to make IM work at the minimum transmission point, the generated double side band is output after the lower side band is filtered by OBPF to realize single carrierFrequency shift of (2);
and 7: inputting the optical carrier after frequency shift to an optical input port of a local oscillator optical comb generation module, firstly entering a DPMZM3 to generate a 7-line optical comb, then entering a DPMZM4 to perform comb expansion on the 7-line optical comb to generate a local oscillator signal LO output by a local oscillator signal source of 49 lines1The RF input port of the DPMZM3 is input to set the DC bias voltages V in the DPMZM33a、V3b、V3cThe output of DPMZM3 is the frequency shift f d7 lines of local oscillator optical combs later;
and 8: 7 line optical local oscillators output by the DPMZM3 enter an optical input port of the DPMZM4, and each direct current bias voltage V in the DPMZM4 is set in the same way4a、V4b、V4cIf so, each local oscillator optical comb output by the DPMZM3 is modulated again to generate 7-line optical local oscillators as new optical carriers, and the frequency value of the local oscillator signal LO2 input in the same manner is the same as that of LO1
DPMZM4 outputs a frequency shift fdThe 49-line local oscillator optical comb;
and step 9: each local oscillator optical comb output by the DMZM4 enters the WDM2 and is divided into independent sub-channels;
step 10: each independent sub-channel divided by WDM1 and the corresponding independent sub-channel divided by WDM2 are respectively used as two paths of input to enter the OHC for down conversion;
step 11: and the same intermediate frequency signal obtained after the down conversion enters the BPD to realize balanced detection.
Step 12: and inputting the IQ baseband signal obtained after the balance detection into an ADC for final digital processing.
The invention has the advantages that the ideal 7-line optical comb can be obtained by simply setting three direct current bias voltages in the DPMZM, and the doubling of the number of comb teeth of the optical comb is easily completed in a dual-drive cascade mode, thereby realizing the multi-channel expansion purpose of the channelized receiver. In addition, the reasonable frequency shift of the local oscillator optical comb can be changed into the same intermediate frequency in the down-conversion of each independent channel, thereby greatly simplifying the complexity of the subsequent ADC and effectively simplifying the channelized receiver system.
Drawings
Fig. 1 is a diagram of an ultra-wideband radio-frequency channelized receiving device of the multi-channel extension of the present invention.
FIG. 2 is a diagram of a 7-line flat optical comb generated by the DPMZM of the present invention.
Fig. 3 is a diagram of an intermediate frequency signal obtained after down-conversion in accordance with the present invention.
Fig. 4 is a constellation diagram of the present invention.
Detailed Description
The invention is further illustrated with reference to the following figures and examples.
The system of the invention utilizes the reasonable setting of each direct current bias voltage of the DPMZM, can generate an ideal optical frequency comb with a large number of comb teeth and high flatness as a signal optical comb and a local oscillator optical comb, realizes the multi-channel expansion of a channelized receiver, and leads each channel after down-conversion to be the same intermediate frequency signal through the reasonable frequency shift of the local oscillator optical comb and then enters an ADC for digital processing. By using VPI optical simulation software to perform simulation verification on the system, the flatness of the optical frequency comb generated by an experimental result is high, and the outer band rejection ratio can reach 19.7 dB.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a multichannel expanded ultra-wideband radio frequency channelized receiving device comprises a Laser Diode (LD), a Parallel double-amplifier Modulator (DPMZM), a radio frequency signal source (RF), a local oscillator signal source (LO), an Intensity Modulator (IM), an optical bandpass filter (OBPF), a amplifier Modulator (MZM), a Wavelength Division Multiplexer (WDM), an optical orthogonal coupler (OHC) and a balanced detector (BPD); the LD output end is divided into an upper path and a lower path, the upper path is connected with the input end of the signal optical comb generation module, and the output end of the signal optical comb generation module is connected with the input end of the MZM; the broadband radio frequency signal RF3 is loaded on the radio frequency input end of the MZM, the output end of the MZM is connected with the input end of the WDM1, and the output end of the WDM1 is divided into multiple paths; the down-path of the LD output end is connected with the input end of the IM, the output end of the IM is connected with the input end of the OBPF, the output end of the OBPF is connected with the local oscillation optical comb generation module, the output end of the local oscillation optical comb generation module is connected with the input end of the WDM2, the output end of the WDM2 is divided into multiple paths, each branch of the WDM2 output end is respectively used as an input signal to enter different OHCs after being in one-to-one correspondence with each branch of the WDM1 output end, that is, WDM1 and WDM2 divide the received 49 optical combs into 49 independent frequency channels at frequency intervals, the first channel in WDM1 and the first channel in WDM2 are combined to enter the OHC as input signals, the second channel in WDM1 and the second channel in WDM2 are combined at a time to enter another OHC as another set of input signals, and by parity of reasoning, the output end of the OHC is connected with two BPDs, one BPD demodulates the I-path signal, the other BPD demodulates the Q-path signal, and the output end of the BPD is connected with the ADC.
In the signal optical comb generation module, two DPMZMs are cascaded and are respectively DPMZM1 and DPMZM2, each DPMZM is composed of two parallel MZMa and MZMb and an independent direct current bias voltage Vc, each DPMZM is only provided with one radio frequency input port MZMaMZ connected with a radio frequency signal source, and the other radio frequency input port MZMb is unloaded; the radio frequency input end MZMa of the DPMZM1 is connected with a radio frequency signal RF1, the radio frequency input end MZMa of the DPMZM2 is connected with a radio frequency signal RF2, the output end of the DPMZM1 is connected with the input end of the DPMZM2, and the output end of the DPMZM2 is connected with the input end of the DPMZM;
in the local oscillator optical comb module, two DPMZMs are cascaded and are respectively DPMZM1 and DPMZM2, each DPMZM is composed of two parallel MZMa and MZMb and an independent direct current bias voltage Vc, each DPMZM is only provided with one radio frequency input port MZMa connected with a radio frequency signal source, and the other radio frequency input port MZMb is unloaded; local oscillator signal LO1The local oscillator signal LO is connected with a radio frequency input end MZMa in the DPMZM3, and a radio frequency input end in the DPMZM42The output of DPMZM3 is connected to the input of DPMZM4, and the output of DPMZM4 is connected to the input of WDM 2.
The invention comprises the following steps during working:
step 1: the single-carrier laser output by the laser source is represented as: ein(t)＝E0exp(jωct), the two radio frequency signals RF1 and RF2 generated by the radio frequency signal source are respectively represented as: s (t)1＝V1sin(ω1t)，s(t)2＝V2sin(ω2t) of whichIn, E0Is the electric field strength, ω, of the optical carriercBeing angular frequency of the optical carrier, s (t)1And s (t)2For two radio frequency signals, V1、V2Other than the amplitude, omega, of the two radio-frequency signals1、ω2The angular frequencies of the two radio frequency signals, respectively;
step 2: the single-carrier laser output by the LD is input to the optical input port of the DPMZM1 in the uplink, the radio frequency signal RF1 output by the radio frequency signal source is input to the radio frequency input port of the DPMZM1, and the output of the DPMZM1 is expressed as:
wherein A ═ π V1a/2Vπ，B＝πV0/2Vπ，VπDenotes the half-wave voltage of MZM or DPMZM, f denotes the frequency of RF1, V0Is the voltage, V, of the applied radio frequency signal RF11aIs the DC bias, V, of the MZMa of DPMZM11bIs the DC bias, V, of the MZMb of DPMZM11cIs the main DC bias of the DPMZM, Jn(x) Representing Bessel function of nth order when satisfied
Then obtaining an ideal 7-line optical comb, carrying out equation simultaneous on the formulas (1) and (2), and then calculating to obtain V when the 7-line optical comb is generated1a、V1b、V1cA value of (d);
and step 3: the 7-line optical comb output by the DPMZM1 enters an optical input port of the DPMZM2, a radio frequency signal RF2 output by a radio frequency signal source is input to a radio frequency input port of the DPMZM2, and each direct current bias voltage V in the DPMZM2 is set in the same way2a、V2b、V2cEach optical comb output by the DPMZM1 is modulated again to form a 7-line optical comb as a new optical carrier, and the frequency value of the input RF signal RF2 is RF1
Otherwise, comb aliasing occurs to influence the modulation effect of the broadband signal, so that the DPMZM2 outputs a 49-wire signal optical comb;
and 4, step 4: the 49-wire signal optical comb output by the DPMZM2 enters the MZM, a broadband radio frequency signal RF3 in the MZM modulates the 49-wire signal optical comb, and the direct current bias voltage of the MZM is set to enable the MZM to work at a minimum transmission point to perform double-sideband modulation of carrier suppression;
and 5: each modulated signal output by the MZM enters WDM1 and is divided into independent sub-channels;
step 6: the single carrier laser output by LD is input into the light input port of IM in the down-path, the RF input port of IM inputs a frequency fdThe single-tone signal of (1) sets the direct-current bias voltage of IM, so that the IM works at the minimum transmission point, and the generated double sidebands are output after being filtered by the OBPF (on-board pulse filter) to realize the frequency shift of a single carrier;
and 7: inputting the optical carrier after frequency shift to an optical input port of a local oscillator optical comb generation module, firstly entering a DPMZM3 to generate a 7-line optical comb, then entering a DPMZM4 to perform comb expansion on the 7-line optical comb to generate a local oscillator signal LO output by a local oscillator signal source of 49 lines1The RF input port of the DPMZM3 is input to set the DC bias voltages V in the DPMZM33a、V3b、V3cThe output of DPMZM3 is the frequency shift f d7 lines of local oscillator optical combs later;
and 8: 7 line optical local oscillators output by the DPMZM3 enter an optical input port of the DPMZM4, and each direct current bias voltage V in the DPMZM4 is set in the same way4a、V4b、V4cIf so, each local oscillator optical comb output by the DPMZM3 is modulated again to generate 7-line optical local oscillators as new optical carriers, and the frequency value of the local oscillator signal LO2 input in the same manner is the same as that of LO1
DPMZM4 outputs a frequency shift fdThe 49-line local oscillator optical comb;
and step 9: each local oscillator optical comb output by the DMZM4 enters the WDM2 and is divided into independent sub-channels;
step 10: each independent sub-channel divided by WDM1 and the corresponding independent sub-channel divided by WDM2 are respectively used as two paths of input to enter the OHC for down conversion;
step 11: and the same intermediate frequency signal obtained after the down conversion enters the BPD to realize balanced detection.
Step 12: and inputting the IQ baseband signal obtained after the balance detection into an ADC for final digital processing.
In the invention:
1) a laser: used for outputting the single carrier laser;
2) a radio frequency signal source: for generating a radio frequency carrier signal;
3) optical fiber: as a transmission channel for optical signals, for remote transmission of signals.
4) Parallel double-sigma modulator: the two sub MZMs work at proper working points and are used for electro-optically modulating a radio frequency driving signal;
5) a sigma modulator: the broadband radio frequency modulator is used for electro-optically modulating a broadband radio frequency signal to be received.
6) A frequency shift module: the optical frequency shift device is composed of an intensity modulator and an optical bandpass filter and is used for carrying out reasonable frequency shift on a local oscillator optical comb.
7) A wavelength division multiplexer: for the independent division of the comb teeth of the optical frequency comb.
8) A photoelectric detector: the photoelectric conversion device is used for performing photoelectric conversion and converting optical signals into electric signals.
9) An analog-to-digital converter: for converting an analog signal to a digital signal.
Example (b):
the device and the method for the multi-channel expanded ultra-wideband radio-frequency channelized reception are subjected to simulation verification through VPI optical simulation software, and an embodiment device figure refers to FIG. 1.
The devices required in the experiments included: two radio frequency signal sources RF1 and RF2, two local oscillator signal sources LO1 and LO2, an arbitrary waveform generator, LD, DPMZM, MZM, IM, OBPF, OHC, WDM, BPD, and ADC.
● radio frequency signal RF 1: frequency 40GHz, power 20 dBm;
radio frequency signal RF 2: frequency 40/7GHz, power 20 dBm;
local oscillator signal LO 1: frequency 39GHz, power 20 dBm;
● local oscillator signal LO 2: frequency 39/7GHz, power 20 dBm;
single carrier laser: the output wavelength is 1551nm and the power is 40 mw;
● DPMZM: the half-wave voltage is 3.5V, the insertion loss is 15dB, and the extinction ratio is 20 dB;
● MZM: the half-wave voltage is 3.5V, the insertion loss is 15dB, and the extinction ratio is 20 dB;
● IM: the half-wave voltage is 3.5V, the insertion loss is 20dB, and the extinction ratio is 20 dB;
WDM: frequency spacing 1GHz
Photodetector: the responsivity was 0.9A/W.
The method comprises the following operation steps:
step 1: the light source generates continuous light waves with the working frequency of 193.1THz and the power of 20dBm, and the continuous light waves are used as carrier power and are divided into two paths to enter an upper path and a lower path respectively.
Step 2: the upper optical carrier is input into the DPMZM1, the frequency of the RF1 is set to 40GHz, and three direct current bias voltages V of the DPMZM1 are set1a、V1b、V1cCausing it to output a flat 7-line optical comb as shown in figure 2.
And step 3: the frequency of RF2 is 40/7GHz, and three DC bias voltages V of DPMZM2 are set2a、V2b、V2cSo that it outputs a flat 49-wire signal optical comb.
And 4, step 4: the 49-wire signal optical comb into the MZM is modulated by a broadband radio frequency signal RF3 at 25-30GHz, spanning the K and Ka bands.
And 5: the signal optical comb modulated by the broadband radio frequency signal RF3 enters the WDM1 and is divided into 49 independent channels with the distance of 1GHz
Step 6: the downstream optical carrier is input to IM and is received by a single tone signal f with frequency of 28GHzdAnd (5) modulating. The IM operates at a minimum operating point and the resulting double sideband signal is filtered by the OBPF to remove the lower sideband.
And 7: after the lower sideband of the optical carrier after frequency shift is filtered by OBPF, the rest upper sideband information enters DPMZM3, the frequency of LO1 is set to 39, and three DC bias voltages V of DPMZM3 are set3a、V3b、V3cSo that the same way is to output a flat 7-line optical comb.
And 8: the frequency of RF2 is 39/7GHz, and three DC bias voltages V of DPMZM4 are set4a、V4b、V4cSo that it outputs a flat 49-line local oscillator optical comb.
And step 9: 49 lines of local oscillator optical combs output by the DPMZM4 enter the WDM2 and are divided into 49 independent channels with the distance of 1GHz
Step 10: and each independent sub-channel divided by the WDM1 and the independent sub-channel corresponding to the independent sub-channel divided by the WDM2 are used as two-way input to enter the OHC for down-conversion.
Step 11: two channels corresponding to each other may obtain different sub-channels of the same intermediate frequency after down-conversion, as shown in fig. 3.
Step 12: the signal output by each channel is sent to the ADC for electrical domain signal processing, and as shown in the constellation diagram of fig. 4, the demodulated baseband signal has no significant distortion.
Claims (4)
1. The utility model provides an ultra wide band radio frequency channelized receiving arrangement that multichannel was extended, includes laser diode, parallel double-motor modulator, radio frequency signal source, local oscillator signal source, intensity modulator, light band-pass filter, motor modulator, wavelength division multiplexer, light quadrature coupler and balanced detector, its characterized in that:
the LD output end is divided into an upper path and a lower path, the upper path is connected with the input end of the signal optical comb generation module, and the output end of the signal optical comb generation module is connected with the input end of the MZM; the broadband radio frequency signal RF3 is loaded on the radio frequency input end of the MZM, the output end of the MZM is connected with the input end of the WDM1, and the output end of the WDM1 is divided into multiple paths; the down-path of the LD output end is connected with the input end of the IM, the output end of the IM is connected with the input end of the OBPF, the output end of the OBPF is connected with the local oscillation optical comb generation module, the output end of the local oscillation optical comb generation module is connected with the input end of the WDM2, the output end of the WDM2 is divided into multiple paths, each branch of the WDM2 output end is respectively used as an input signal to enter different OHCs after being in one-to-one correspondence with each branch of the WDM1 output end, that is, WDM1 and WDM2 divide the received 49 optical combs into 49 independent frequency channels at frequency intervals, the first channel in WDM1 and the first channel in WDM2 are combined to enter the OHC as input signals, the second channel in WDM1 and the second channel in WDM2 are combined at a time to enter another OHC as another set of input signals, and by parity of reasoning, the output end of the OHC is connected with two BPDs, one BPD demodulates the I-path signal, the other BPD demodulates the Q-path signal, and the output end of the BPD is connected with the ADC.
2. The ultra-wideband radio-frequency channelized receiver device of claim 1, characterized by:
in the signal optical comb generation module, two DPMZMs are cascaded and are respectively DPMZM1 and DPMZM2, each DPMZM is composed of two parallel MZMa and MZMb and an independent direct current bias voltage Vc, each DPMZM is only provided with one radio frequency input port MZMaMZ connected with a radio frequency signal source, and the other radio frequency input port MZMb is unloaded; the radio frequency input MZMa of DPMZM1 is connected to radio frequency signal RF1, the radio frequency input MZMa of DPMZM2 is connected to radio frequency signal RF2, the output of DPMZM1 is connected to the input of DPMZM2, and the output of DPMZM2 is connected to the input of MZM.
3. The ultra-wideband radio-frequency channelized receiver device of claim 1, characterized by:
in the local oscillator optical comb module, two DPMZMs are cascaded and are respectively DPMZM1 and DPMZM2, each DPMZM is composed of two parallel MZMa and MZMb and an independent direct current bias voltage Vc, each DPMZM is only provided with one radio frequency input port MZMa connected with a radio frequency signal source, and the other radio frequency input port MZMb is unloaded; local oscillator signal LO1The local oscillator signal LO is connected with a radio frequency input end MZMa in the DPMZM3, and a radio frequency input end in the DPMZM42The output of DPMZM3 is connected to the input of DPMZM4, and the output of DPMZM4 is connected to the input of WDM 2.
4. A method for using the ultra-wideband rf channelized receiver device of claim 1 with multi-channel expansion, comprising the steps of:
step 1: the single-carrier laser output by the laser source is represented as: ein(t)＝E0exp(jωct), the two radio frequency signals RF1 and RF2 generated by the radio frequency signal source are respectively represented as: s (t)1＝V1sin(ω1t)，s(t)2＝V2sin(ω2t) in which E0Is the electric field strength, ω, of the optical carriercBeing angular frequency of the optical carrier, s (t)1And s (t)2For two radio frequency signals, V1、V2Other than the amplitude, omega, of the two radio-frequency signals1、ω2The angular frequencies of the two radio frequency signals, respectively;
step 2: the single-carrier laser output by the LD is input to the optical input port of the DPMZM1 in the uplink, the radio frequency signal RF1 output by the radio frequency signal source is input to the radio frequency input port of the DPMZM1, and the output of the DPMZM1 is expressed as:
wherein A ═ π V1a/2Vπ，B＝πV0/2Vπ，VπDenotes the half-wave voltage of MZM or DPMZM, f denotes the frequency of RF1, V0Is the voltage, V, of the applied radio frequency signal RF11aIs the DC bias, V, of the MZMa of DPMZM11bIs the DC bias, V, of the MZMb of DPMZM11cIs the main DC bias of the DPMZM, Jn(x) Representing Bessel function of nth order when satisfied
Obtaining an ideal 7-line optical comb, carrying out equation simultaneous on the formulas (1) and (2), and then calculating to obtain V when the 7-line optical comb is generated1a、V1b、V1cA value of (d);
and step 3: the 7-line optical comb output by the DPMZM1 enters an optical input port of the DPMZM2, a radio frequency signal RF2 output by a radio frequency signal source is input to a radio frequency input port of the DPMZM2, and each direct current bias in the DPMZM2 is set in the same wayPressure V2a、V2b、V2cEach optical comb output by the DPMZM1 is modulated again to form a 7-line optical comb as a new optical carrier, and the frequency value of the input RF signal RF2 is RF1
Otherwise, comb aliasing occurs to influence the modulation effect of the broadband signal, so that the DPMZM2 outputs a 49-wire signal optical comb;
and 4, step 4: the 49-wire signal optical comb output by the DPMZM2 enters the MZM, a broadband radio frequency signal RF3 in the MZM modulates the 49-wire signal optical comb, and the direct current bias voltage of the MZM is set to enable the MZM to work at a minimum transmission point to perform double-sideband modulation of carrier suppression;
and 5: each modulated signal output by the MZM enters WDM1 and is divided into independent sub-channels;
step 6: the single carrier laser output by LD is input into the light input port of IM in the down-path, the RF input port of IM inputs a frequency fdThe single-tone signal of (1) sets the direct-current bias voltage of IM, so that the IM works at the minimum transmission point, and the generated double sidebands are output after being filtered by the OBPF (on-board pulse filter) to realize the frequency shift of a single carrier;
and 7: inputting the optical carrier after frequency shift to an optical input port of a local oscillator optical comb generation module, firstly entering a DPMZM3 to generate a 7-line optical comb, then entering a DPMZM4 to perform comb expansion on the 7-line optical comb to generate a local oscillator signal LO output by a local oscillator signal source of 49 lines1The RF input port of the DPMZM3 is input to set the DC bias voltages V in the DPMZM33a、V3b、V3cThe output of DPMZM3 is the frequency shift fd7 lines of local oscillator optical combs later;
and 8: 7 line optical local oscillators output by the DPMZM3 enter an optical input port of the DPMZM4, and each direct current bias voltage V in the DPMZM4 is set in the same way4a、V4b、V4cIf so, each local oscillator optical comb output by the DPMZM3 is modulated again to generate 7-line optical local oscillators as new optical carriers, and the frequency value of the local oscillator signal LO2 input in the same manner is the same as that of LO1
DPMZM4 outputs a frequency shift fdThe 49-line local oscillator optical comb;
and step 9: each local oscillator optical comb output by the DMZM4 enters the WDM2 and is divided into independent sub-channels;
step 10: each independent sub-channel divided by WDM1 and the corresponding independent sub-channel divided by WDM2 are respectively used as two paths of input to enter the OHC for down conversion;
step 11: the same intermediate frequency signal obtained after the down conversion enters the BPD to realize the balance detection;
step 12: and inputting the IQ baseband signal obtained after the balance detection into an ADC for final digital processing.
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