CN113612543B - Channelized receiving device and method for injection locking of microwave photon single-optical-frequency comb - Google Patents
Channelized receiving device and method for injection locking of microwave photon single-optical-frequency comb Download PDFInfo
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Abstract
A microwave photon single optical frequency comb injection locking channelized receiving device and method, the device includes: the optical carrier unit is suitable for generating a single-frequency continuous optical carrier and dividing the single-frequency continuous optical carrier into a first single-frequency continuous optical carrier and a second single-frequency continuous optical carrier; the optical frequency comb generating unit is suitable for receiving the first single-frequency continuous optical carrier and generating an optical frequency comb; the demultiplexing unit group is used for demultiplexing the needed optical frequency comb teeth in the optical frequency comb; a receiving antenna; the double-sideband modulation unit is used for modulating the double sidebands of the received signals received by the receiving antenna onto a second path of single-frequency continuous optical carrier and outputting modulated optical carriers; and the coherent demodulation module is used for carrying out coherent demodulation on the modulated optical carrier by taking the demultiplexed optical frequency comb teeth as reference signals. The channelized receiving device with the microwave photon single-optical-frequency comb injection locking improves the working bandwidth and narrows the instantaneous bandwidth.
Description
Technical Field
The invention belongs to the technical field of microwave photonics, and particularly relates to a channelized receiving device and a channelized receiving method for injection locking of a microwave photon single-optical-frequency comb.
Background
With the rapid development of information technology, many aspects such as electronic communication, radar, electronic warfare and the like all put higher demands on signal bandwidth. However, due to the "electronic bottleneck" limitation of the conventional electronic devices, the microwave receiver system is hindered in bandwidth expansion, spectrum efficiency improvement, and the like. Meanwhile, with the continuous development of the optical fiber communication technology, devices of the optical fiber communication technology have the advantages of small size, small signal interference, no radiation and the like, the advantages can be complemented with the microwave communication technology, and the advantages are mutually permeated and fused to form a new technology, namely the microwave photon technology. The microwave photon technology integrates the advantages of low loss of the optical wave broadband and fine control of the microwave narrowband, and provides a new scheme for bandwidth extension and efficiency improvement of signals.
However, the performance of the existing communication receiving apparatus still needs to be improved.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a channelized receiving method and a channelized receiving device for injection locking of a microwave photon single-optical-frequency comb.
The invention provides a microwave photon single optical frequency comb injection locking channelized receiving device, which comprises: the optical carrier unit is used for generating a single-frequency continuous optical carrier and dividing the single-frequency continuous optical carrier into a first path of single-frequency continuous optical carrier and a second path of single-frequency continuous optical carrier; the optical frequency comb generating unit is used for receiving the first single-frequency continuous optical carrier and generating an optical frequency comb; the demultiplexing unit group is used for demultiplexing the needed optical frequency comb teeth in the optical frequency comb; a receiving antenna; the double-sideband modulation unit is used for modulating the double-sideband of the received signal received by the receiving antenna onto a second path of single-frequency continuous optical carrier and outputting a modulated optical carrier; and the coherent demodulation module is used for performing coherent demodulation on the modulated optical carrier by taking the demultiplexed optical frequency comb teeth as reference signals.
Optionally, the optical carrier unit includes a laser and a first beam splitting unit, the laser is configured to generate a single-frequency continuous optical carrier, and the first beam splitting unit is configured to split the single-frequency continuous optical carrier generated by the laser into a first single-frequency continuous optical carrier and a second single-frequency continuous optical carrier.
Optionally, the optical-frequency comb generating unit includes: a microwave source for generating a single frequency microwave signal; 3, a frequency multiplier; the output end of the microwave source is connected with the input end of a frequency 3 multiplier and the radio frequency input end of a third intensity modulator, the output end of the frequency 3 multiplier is connected with the radio frequency input end of the first intensity modulator, the radio frequency input end of the second intensity modulator, the radio frequency input end of the first phase modulator and the radio frequency input end of the second phase modulator, the light output end of the first phase modulator is connected with the light input end of the second phase modulator, the light output end of the second phase modulator is connected with the light input end of the first intensity modulator, the light output end of the first intensity modulator is connected with the light input end of the second intensity modulator, the light output end of the second intensity modulator is connected with the light input end of the third intensity modulator, and the optical output end of the third intensity modulator is used as the output end of the optical frequency comb generation unit.
Optionally, the coherent demodulation module includes a first coherent demodulation unit to an nth coherent demodulation unit; n is an integer greater than or equal to 2; the microwave photon single-optical-frequency comb injection-locked channelized receiving device further comprises: the input end of the second beam splitting unit is connected with the output end of the optical frequency comb generating unit, and the second beam splitting unit is used for splitting the optical frequency comb into a first path of sub optical frequency comb to an Nth path of sub optical frequency comb; the third beam splitting unit is used for receiving the modulated optical carrier output by the double-sideband modulation unit and dividing the modulated optical carrier into a first path of sub-modulated optical carrier to an Nth path of sub-modulated optical carrier, wherein the signals of all paths of sub-modulated optical carriers from the first path of sub-modulated optical carrier to the Nth path of sub-modulated optical carrier are the same; the demultiplexing unit group comprises a first demultiplexing unit and an Nth demultiplexing unit, the first demultiplexing unit is used for outputting a first characteristic comb tooth, the Nth demultiplexing unit is used for outputting an Nth characteristic comb tooth, and the frequencies of the first characteristic comb tooth to the Nth characteristic comb tooth are different; the second beam splitting unit is used for outputting the nth path of sub-optical frequency comb to the nth demultiplexing unit, and the nth demultiplexing unit is suitable for outputting the nth characteristic comb to the nth coherent demodulation unit; n is an integer of 1 or more and N or less; the third beam splitting unit is used for outputting the nth path of sub-modulation optical carrier to the nth coherent demodulation unit.
Optionally, the first demultiplexing unit includes a first distributed feedback laser and a first circulator, the nth demultiplexing unit includes an nth distributed feedback laser and an nth circulator, the nth circulator is used to inject the nth sub-optical frequency comb into the nth distributed feedback laser, the nth circulator is further used to output the nth characteristic comb, and locking frequencies of the first distributed feedback laser to the nth distributed feedback laser are different.
Optionally, the nth distributed feedback laser has a locking frequency f DFB (n)，f DFB (n)＝f c +nf m ；f c The frequency of the first path of single-frequency continuous optical carrier wave; the optical frequency comb generating unit comprises a microwave source f m The frequency of the microwave signal output by the microwave source.
Optionally, the nth coherent demodulation unit includes: an nth 90-degree optical bridge, an nth first balanced photodetector, an nth second balanced photodetector, a 2n-1 low-pass filter, a 2 nth low-pass filter, an nth first analog-to-digital converter and an nth second analog-to-digital converter; a first input end of the nth 90-degree optical bridge is connected with an output end of the nth demultiplexing unit, a second input end of the nth 90-degree optical bridge is connected with an nth output end of the third beam splitting unit, and the nth output end of the third beam splitting unit is suitable for outputting nth sub-modulation optical carriers; a first output end of the nth 90-degree optical bridge and a second output end of the nth 90-degree optical bridge are connected with an input end of the nth first photoelectric balanced detector, and a third output end of the nth 90-degree optical bridge and a fourth output end of the nth 90-degree optical bridge are connected with an input end of the nth second photoelectric balanced detector; the nth first photoelectric balanced detector outputs an nth first electric signal to the 2n-1 low-pass filter, and the nth second photoelectric balanced detector outputs an nth second electric signal to the 2n low-pass filter; the output end of the 2n-1 low-pass filter is connected with the input end of the nth first analog-to-digital converter, and the output end of the 2n low-pass filter is connected with the input end of the nth second analog-to-digital converter.
Optionally, a first output end of the nth 90 ° optical bridge is adapted to output a first composite output signal, a second output end of the nth 90 ° optical bridge is adapted to output a second composite output signal, a third output end of the nth 90 ° optical bridge is adapted to output a third composite output signal, a fourth output end of the nth 90 ° optical bridge is adapted to output a fourth composite output signal, the first composite output signal is orthogonal to the second composite output signal, and the third composite output signal is orthogonal to the fourth composite output signal.
Optionally, the cut-off frequency of each low-pass filter is
The optical frequency comb generating unit comprises a microwave source f m The frequency of the microwave signal output by the microwave source.
Optionally, the method further includes: the digital signal processing unit; the output end of the first analog-to-digital converter to the output end of the Nth first analog-to-digital converter, and the output end of the first second analog-to-digital converter to the output end of the Nth second analog-to-digital converter are connected with the digital signal processing unit; the digital signal processing unit is adapted to obtain phase information and amplitude information in the received signal.
Optionally, the double-sideband modulation unit is a mach-zehnder modulator.
The invention also provides a channelized receiving method for injection locking of the microwave photon single-optical-frequency comb, which comprises the following steps: the optical carrier unit generates a single-frequency continuous optical carrier and divides the single-frequency continuous optical carrier into a first path of single-frequency continuous optical carrier and a second path of single-frequency continuous optical carrier; the optical frequency comb generating unit receives the first single-frequency continuous optical carrier and generates an optical frequency comb; the demultiplexing unit group demultiplexes the needed optical frequency comb teeth in the optical frequency comb; the double-sideband modulation unit modulates the double-sideband of the received signal received by the receiving antenna onto a second path of single-frequency continuous optical carrier and outputs a modulated optical carrier; and the coherent demodulation module performs coherent demodulation on the modulated optical carrier by taking the demultiplexed optical frequency comb teeth as reference signals.
Optionally, the optical carrier unit includes a laser and a first beam splitting unit; the step that the optical carrier unit generates the single-frequency continuous optical carrier and divides the single-frequency continuous optical carrier into a first single-frequency continuous optical carrier and a second single-frequency continuous optical carrier comprises the following steps: the laser generates a single-frequency continuous optical carrier; the first beam splitting unit splits a single-frequency continuous optical carrier generated by the laser into a first path of single-frequency continuous optical carrier and a second path of single-frequency continuous optical carrier.
Optionally, the coherent demodulation module includes a first coherent demodulation unit to an nth coherent demodulation unit; the demultiplexing unit group comprises a first demultiplexing unit to an Nth demultiplexing unit; n is an integer greater than or equal to 2; the microwave photon single-optical-frequency comb injection-locked channelized receiving device further comprises: a second beam splitting unit; a third beam splitting unit; the channelized receiving method for the injection locking of the microwave photon single-optical-frequency comb further comprises the following steps: the second beam splitting unit divides the optical frequency comb generated by the optical frequency comb generating unit into a first path of sub optical frequency comb to an Nth path of sub optical frequency comb; the nth demultiplexing unit receives the nth path of sub optical frequency comb output by the second beam splitting unit and outputs nth characteristic comb teeth to the nth coherent demodulation unit; the frequencies from the first characteristic comb teeth to the Nth characteristic comb teeth are different; the third beam splitting unit receives the modulated optical carrier output by the double-sideband modulation unit and divides the modulated optical carrier into a first path of sub-modulated optical carrier to an Nth path of sub-modulated optical carrier, and signals of all paths of sub-modulated optical carriers from the first path of sub-modulated optical carrier to the Nth path of sub-modulated optical carrier are the same; the third beam splitting unit outputs the nth path of sub-modulation optical carrier to the nth coherent demodulation unit; the nth coherent demodulation unit uses the nth characteristic comb tooth as a reference signal to perform coherent demodulation on the modulated optical carrier.
The technical scheme of the invention has the following beneficial effects:
1. the channelized receiving device with the microwave photon single-optical-frequency comb injection locking function, which is provided by the technical scheme of the invention, has good universality, can be widely applied to various microwave photon systems, and has good economy; according to the invention, the optical frequency comb is subjected to demultiplexing operation by using injection locking of the distributed feedback laser, so that a large-size polycrystalline oscillator and a radio frequency filter are avoided, the structure is more compact, the optical frequency comb teeth with smaller free spectral range can be separated, and the insertion loss and the introduction of noise are reduced. Meanwhile, the optical direct frequency conversion method does not need a complex tunable optical filter. The working bandwidth can be effectively improved, and the instantaneous bandwidth can be narrowed.
Drawings
FIG. 1 is a block diagram of the structure of a microwave photonic single-optical-frequency comb injection-locked channelized receiver according to the present invention;
fig. 2 is a schematic structural diagram of a channelized receiver with injection locking of microwave photon single-optical-frequency comb according to an embodiment of the present invention.
Detailed Description
An embodiment of the present invention provides a microwave photonic single-optical-frequency comb injection-locked channelized receiving apparatus, referring to fig. 1, including: an optical carrier unit; an optical frequency comb generating unit 120; a second beam splitting unit 130; a demultiplexing unit group 140; a receiving antenna 150; a double sideband modulation unit 160; a third bundling unit 170; a coherent demodulation module 180. The optical carrier unit comprises a laser 100 and a first beam splitting unit 110.
The optical carrier unit is suitable for generating a single-frequency continuous optical carrier and dividing the single-frequency continuous optical carrier into a first path of single-frequency continuous optical carrier and a second path of single-frequency continuous optical carrier.
The laser 100 is used to generate a single frequency continuous optical carrier.
The first beam splitting unit 110 is configured to split the single-frequency continuous optical carrier generated by the laser 100 into a first single-frequency continuous optical carrier and a second single-frequency continuous optical carrier.
The first single-frequency continuous optical carrier output by the first beam splitting unit 110 enters the optical frequency comb generating unit 120, and the second single-frequency continuous optical carrier output by the first beam splitting unit 110 enters the double-sideband modulating unit 160.
The optical frequency comb generating unit 120 is configured to receive the first single-frequency continuous optical carrier, and is configured to generate an optical frequency comb with a certain frequency interval and output the optical frequency comb to the second beam splitting unit 130.
The second beam splitting unit 130 is configured to split the optical frequency comb into N sub-optical frequency combs, where the N is an integer greater than or equal to 2 and includes a first sub-optical frequency comb to an nth sub-optical frequency comb.
The demultiplexing unit group is used for demultiplexing needed comb teeth in the optical frequency comb. The demultiplexing unit group 140 includes first to nth demultiplexing units. The first demultiplexing unit is used for outputting a first characteristic comb tooth, the Nth demultiplexing unit is used for outputting an Nth characteristic comb tooth, the nth demultiplexing unit is used for outputting an nth characteristic comb tooth, and the frequencies from the first characteristic comb tooth to the Nth characteristic comb tooth are different.
The second beam splitting unit 130 outputs the nth sub-optical frequency comb to the nth demultiplexing unit, where N is an integer greater than or equal to 1 and less than or equal to N.
The first demultiplexing unit to the Nth demultiplexing unit respectively comprise Distributed Feedback (DFB) lasers which are used for amplifying the characteristic comb teeth in the sub-optical frequency comb and inhibiting other comb teeth except the characteristic comb teeth, so that the effect of demultiplexing the characteristic comb teeth is achieved. When the laser wavelength of the Distributed Feedback (DFB) laser is close to or even the same as the laser wavelength generated by the laser, the laser of the Distributed Feedback (DFB) laser will lock onto the wavelength of the laser.
The receiving antenna 150 is used for receiving signals (communication signals) transmitted by other transmitters.
The double-sideband modulation unit 160 is configured to modulate the double-sideband of the received signal received by the receiving antenna 150 onto the second single-frequency continuous optical carrier and output a modulated optical carrier.
The third beam splitting unit 170 is configured to split the modulated optical carrier into N paths, including the first path of sub-modulated optical carrier to the nth path of sub-modulated optical carrier.
The coherent demodulation module is used for carrying out coherent demodulation on the modulated optical carrier by taking the demultiplexed optical frequency comb teeth as reference signals. The coherent demodulation module 180 includes first to nth coherent demodulation units.
The third beam splitting unit 170 outputs the nth sub-modulated optical carrier to the nth coherent demodulation unit.
The first characteristic comb output by the first demultiplexing unit and the first sub-modulated optical carrier output by the third demultiplexing unit 170 form a first pair of complex waves, the nth characteristic comb output by the nth demultiplexing unit and the nth sub-modulated optical carrier output by the third demultiplexing unit 170 form an nth pair of complex waves, and the nth characteristic comb output by the nth demultiplexing unit and the nth sub-modulated optical carrier output by the third demultiplexing unit 170 form an nth pair of complex waves.
The first pair of complex waves is input into the first coherent demodulation unit, the nth pair of complex waves is input into the nth coherent demodulation unit, and the nth pair of complex waves is input into the nth coherent demodulation unit.
And the coherent demodulation module is used for performing coherent demodulation on the modulated optical carrier by taking the demultiplexed optical frequency comb teeth as reference signals. Specifically, the nth coherent demodulation unit is configured to perform coherent demodulation on the nth sub-modulated optical carrier with the nth characteristic comb as a reference signal.
The technical solution of the present invention is further described in detail with reference to fig. 2. As shown in fig. 2, the microwave photonic single-optical-frequency comb injection-locked channelized receiving device of the present embodiment includes: laser 100, first beam splitting unit 110, microwave source 190, 3 frequency multiplier 200, phase modulator, intensity modulator, second beam splitting unit 130, N circulators, N distributed feedback lasers, receive antenna 150, mach-zehnder modulator (MZM)160a, third beam splitting unit 170, N90 ° optical bridges, N first balanced photodetectors, N second balanced photodetectors, 2N low pass filters, N first analog-to-digital converters ADC 1 N second analog-to-digital converters ADC 2 And a digital signal processing unit 230.
The laser 100 generates a single-frequency continuous optical carrier, and the signal electric field of the single-frequency continuous optical carrier generated by the laser 100 is:
wherein f is c At a frequency at which the laser 100 generates a single-frequency continuous optical carrier, ec (t) is the electric field at which the laser 100 generates the single-frequency continuous optical carrier, t is time, and j is an imaginary unit.
The optical-frequency comb generating unit 120 includes: a microwave source 190, a 3-multiplier 200, a first phase modulator 210a, a second phase modulator 210b, a first intensity modulator 220a, a second intensity modulator 220b, and a third intensity modulator 220 c. The output end of the microwave source 190 is connected to the input end of the 3-frequency multiplier 200 and the radio frequency input end of the third intensity modulator 220c, and the output end of the 3-frequency multiplier 200 is connected to the radio frequency input end of the first intensity modulator 220a, the radio frequency input end of the second intensity modulator 220b, the radio frequency input end of the first phase modulator 210a, and the radio frequency input end of the second phase modulator 210 b. The optical output of the first phase modulator 210a is connected to the optical input of the second phase modulator 210b, the optical output of the second phase modulator 210b is connected to the optical input of the first intensity modulator 220a, the optical output of the first intensity modulator 220a is connected to the optical input of the second intensity modulator 220b, and the optical output of the second intensity modulator 220b is connected to the optical input of the third intensity modulator 220 c. In this embodiment, the optical output end of the third intensity modulator 220c is used as the output end of the optical-frequency comb generating unit 120.
The microwave source 190 is used to generate a single frequency microwave signal. The microwave signal output by the microwave source 190 has a frequency f m . After the microwave signal output from the microwave source 190 passes through the 3-frequency multiplier 200, the frequency of the microwave signal output from the 3-frequency multiplier 200 is 3f m . Frequency of 3f m Drives the first phase modulator 210a, the second phase modulator 210b, the first intensity modulator 220a and the second intensity modulator 220b to generate a frequency interval of 3f m Q, and the output frequency interval of the second intensity modulator 220b is 3f m And the number of the comb teeth is q. Secondly, the microwave signal output by the microwave source 190 drives the third intensity modulator 220c, and finally the third intensity modulator 220c outputs a frequency interval f m And an optical frequency comb with the comb tooth number of 3 q. The output of the third intensity modulator 220c is connected to the output of the second beam splitting element.
In this embodiment, the relationship between q and N is: and N is (3 q-1)/2.
The single-frequency continuous optical carrier generated by the laser 100 is divided into two paths by the first beam splitting unit 110, one path of the single-frequency continuous optical carrier output by the first beam splitting unit 110 enters the cascaded intensity modulators 220a to 220c and phase modulators 210a to 210b, and specifically, one path of the single-frequency continuous optical carrier output by the first beam splitting unit 110 enters the optical input end of the first phase modulator 210 a.
The microwave source 190 is used to generate microwave signals that drive the intensity modulators 220a-220c and the respective phase modulators. Under the modulation effect of the microwave source 190, the output of the third intensity modulator 220c obtains the optical frequency comb.
Namely that
Wherein f is m Frequency of the microwave signal output by the microwave source, f c The frequency of a single-frequency continuous optical carrier wave generated for the laser 100, j being an imaginary unit, t being time, E lo (t) represents an electric field of the optical frequency comb.
The N distributed feedback lasers include a first distributed feedback laser DFB 1 Distributed feedback to Nth DFB laser N . The N circulators include first to nth circulators.
In this embodiment, the first demultiplexing unit includes a first distributed feedback laser DFB 1 And a first circulator, the Nth de-multiplexing unit comprises an Nth distributed feedback laser DFB N And an nth circulator, wherein the nth demultiplexing unit comprises an nth distributed feedback laser and an nth circulator. Each circulator is a fiber circulator. Each circulator is a standard three-port device, the nth circulator is provided with a first port, a second port and a third port, the first port of the nth circulator is suitable for inputting the nth sub optical frequency comb, the second port of the nth circulator is connected with the nth distributed feedback laser, and the third port of the nth circulator is connected with the nth coherent demodulation unit. And the nth circulator is used for injecting the nth sub optical frequency comb into the nth distributed feedback laser, and is also used for outputting the nth characteristic comb tooth.
And the nth characteristic comb output by the nth distributed feedback laser is input to the nth coherent demodulation unit. Specifically, the nth characteristic comb output by the nth distributed feedback laser is output to the nth coherent demodulation unit from the third port of the nth circulator.
The optical frequency comb signal passes through the second beam splitting unit 130The back part is divided into N paths of sub-optical frequency combs, and the N paths of sub-optical frequency combs comprise a first path of sub-optical frequency comb to an Nth path of sub-optical frequency comb. And the nth sub optical frequency comb is input into the nth distributed feedback laser. The nth distributed feedback laser has a locking frequency f DFB (n)。f DFB (n)＝f c +nf m (ii) a Wherein N is 1, 2, 3 … … N. The locking frequencies of the first distributed feedback laser to the Nth distributed feedback laser are different.
The nth distributed feedback laser is used for amplifying the characteristic comb teeth in the nth sub-optical-frequency comb and inhibiting other comb teeth except the characteristic comb teeth in the nth sub-optical-frequency comb to achieve demultiplexing of the nth characteristic comb teeth. The nth distributed feedback laser outputs nth characteristic comb teeth.
Wherein n is the number of channels. E' lo (t) n Representing the electric field of the nth characteristic comb tooth.
The electric field of the reception signal received by the reception antenna 150 is v r (t)。
Where r (t) is the amplitude of the received signal and l is an integer.
The second single-frequency continuous optical carrier outputted by the first beam splitting unit 110 is inputted to the double-sideband modulation unit 160, in this embodiment, the double-sideband modulation unit 160 is a mach-zehnder modulator 160a, and the second single-frequency continuous optical carrier outputted by the first beam splitting unit 110 is inputted to the mach-zehnder modulator 160 a.
The mach-zehnder modulator 160a is configured to modulate the received signal received by the receiving antenna 150 onto a second single-frequency continuous optical carrier and output a modulated optical carrier.
When the mach-zehnder modulator 160a is biased at the minimum transmission point, the electric field of the modulated optical carrier output by the mach-zehnder modulator 160a is esig (t).
The third beam splitting unit 170 is configured to split the modulated optical carrier into N paths, including the first path of sub-modulated optical carrier to the nth path of sub-modulated optical carrier. The signals of all the paths of sub-modulation optical carriers from the first path of sub-modulation optical carrier to the Nth path of sub-modulation optical carrier are the same.
In this embodiment, the nth coherent demodulation unit includes: an nth 90-degree optical bridge, an nth first balanced photodetector, an nth second balanced photodetector, a 2n-1 low pass filter, a 2 nth low pass filter, an nth first analog-to-digital converter, and an nth second analog-to-digital converter. A first input end of the nth 90 ° optical bridge is connected to an output end of the nth demultiplexing unit, a second input end of the nth 90 ° optical bridge is connected to an nth output end of the third beam splitting unit 170, and the nth output end of the third beam splitting unit 170 is adapted to output an nth sub-modulated optical carrier.
The nth first photoelectric balance detector outputs the nth first electric signal to the 2n-1 low-pass filter, and the nth second photoelectric balance detector outputs the nth second electric signal to the 2n low-pass filter.
The nth characteristic comb output by the nth demultiplexing unit and the nth path of sub-modulated optical carrier output by the third beam splitting unit 170 form an nth pair of composite waves. The nth pair of complexes is input to an nth coherent demodulation unit, and specifically, the nth pair of complexes is input to an nth 90 ° optical bridge in the nth coherent demodulation unit. Each 90 ° optical bridge has a first output terminal, a second output terminal, a third output terminal, and a fourth output terminal, the first output terminal of the nth 90 ° optical bridge is adapted to output the first composite output signal, the second output terminal of the nth 90 ° optical bridge is adapted to output the second composite output signal, the third output terminal of the nth 90 ° optical bridge is adapted to output the third composite output signal, and the fourth output terminal of the nth 90 ° optical bridge is adapted to output the fourth composite output signal.
The first path of composite output signal output by the nth 90-degree optical bridge connector is E n1 The second path of composite output signal output by the nth 90-degree optical bridge is E n2 And the third composite output signal output by the nth 90-degree optical bridge is E n3 The fourth composite output signal output by the nth 90-degree optical bridge is E n4 . The first path of composite output signal output by the nth 90-degree optical bridge is orthogonal to the second path of composite output signal output by the nth 90-degree optical bridge, and the third path of composite output signal output by the nth 90-degree optical bridge is orthogonal to the fourth path of composite output signal output by the nth 90-degree optical bridge.
E n1 ＝E sig (t)+E’ lo (t) n (formula 6-1).
E n2 ＝E sig (t)-E’ lo (t) n (formula 6-2).
E n3 ＝E sig (t)+jE’ lo (t) n (formula 6-3).
E n4 ＝E sig (t)-jE’ lo (t) n (formula 6-4).
A first output of the nth 90 ° optical bridge and a second output of the nth 90 ° optical bridge are connected to an input of the nth first photoelectric balanced detector, and a third output of the nth 90 ° optical bridge and a fourth output of the nth 90 ° optical bridge are connected to an input of the nth second photoelectric balanced detector.
The first path of composite output signal output by the nth 90-degree optical bridge and the second path of composite output signal output by the nth 90-degree optical bridge are input to the nth first photoelectric balance detector, the nth first photoelectric balance detector outputs the nth first electric signal, and V is n1 (t) is a voltage of the nth first electrical signal.
V n1 (t)∝4|r(t)|{cos[2π(l-n)f m t+arg(r(t))]+cos[2π(-l-n)f m t-arg(r(t))]And (equation 7).
The third composite output signal output by the nth 90-degree optical bridge and the fourth composite output signal output by the nth 90-degree optical bridge are input to an nth second photoelectric balanced detector and an nth second lightThe electrically balanced detector outputs an nth second electrical signal, V n2 And (t) is the voltage of the nth second electrical signal.
V n2 (t)∝4|r(t)|{sin[2π(l-n)f m t+arg(r(t))]+sin[2π(-l-n)f m t-arg(r(t))]And (equation 8).
The output end of the nth first photoelectric balance detector is connected with the input end of the 2n-1 low-pass filter, the nth first photoelectric balance detector outputs the nth first electric signal to the 2n-1 low-pass filter, the output end of the nth second photoelectric balance detector is connected with the input end of the 2n low-pass filter, and the nth second photoelectric balance detector outputs the nth second electric signal to the 2n low-pass filter. The cut-off frequency of each low-pass filter is
The output end of the 2n-1 low-pass filter is connected with the input end of the nth first analog-to-digital converter, and the output end of the 2n low-pass filter is connected with the input end of the nth second analog-to-digital converter. The output of the 2n-1 low-pass filter is adapted to output the nth first filtered electrical signal, V n3 (t) is the voltage of the nth first filtered electrical signal.
V n3 (t)∝4|r(t)|cos[arg(r(t))](formula 9-1).
The output of the 2n low-pass filter is adapted to output an n second filtered electrical signal, V n4 (t) is the voltage of the nth second filtered electrical signal.
v n4 (t)∝4|r(t)|sin[arg(r(t))](formula 9-2).
The nth first analog-to-digital converter outputs an nth first digital sub-signal, and the nth second analog-to-digital converter outputs an nth second digital sub-signal.
The output end of the first analog-to-digital converter to the output end of the Nth first analog-to-digital converter, and the output end of the first second analog-to-digital converter to the output end of the Nth second analog-to-digital converter are connected with the digital signal processing unit.
The digital signal processing unit is adapted to obtain phase information and amplitude information in the received signal.
Wherein arg (r (t)) is phase information in the received signal.
The above formula shows that the amplitude and phase of the useful information in the received signal are obtained by the receiving system of the present invention, that is, the demodulation of the received signal is completed.
The channelization technique is a means for dividing a signal having a large bandwidth into a plurality of signals having a narrow bandwidth. The instantaneous bandwidth of the ADC analog-to-digital converter limits the increase in signal bandwidth. The channelization technology effectively reduces the instantaneous bandwidth requirements of the ADC analog-to-digital converter. Traditional electronic-based channelization often has the disadvantages of large power consumption, large channel relative bandwidth, severe inter-channel crosstalk and the like. When microwave photonic technology is also used in channelization, advantages of microwave photonic channelization include: compared with an electronic element, the photonic device is smaller in size and lower in transmission loss, so that the whole system is more compact and lower in power consumption; the optical carrier frequency is high, and the bandwidth is extremely small, so that the transmission characteristic of the line is more stable; the photon system can resist electromagnetic interference, and the information safety degree is higher; and the microwave optical sub-channelization can be in butt joint with a traditional electronic channelized signal processing system, and the transmission and processing work of broadband signals which cannot be completed by a traditional electronic system can be completed by means of various advantages of optical communication.
It should be noted that, at present, the schemes for microwave optical sub-channelized reception mainly include two types of channelization based on dual optical frequency comb and I/Q demodulation and channelization based on filtering effect. The method based on the double optical frequency comb and the I/Q demodulation is to modulate a radio frequency signal to one of the paths of frequency intervals of f through carrier suppression single sideband S On the other channel of the signal optical frequency comb, the frequency interval of the other channel of the intrinsic optical frequency comb is f LO . Comb teeth interval f of two optical frequency combs S And f LO With slight differences, different frequency components of the electrical signal modulated on different comb teeth can be selected through image rejection mixing. The filtering effect based channelization mainly includes two types of optical frequency comb filtering and grating filtering. The channelization based on optical frequency comb filtering is to modulate a radio frequency signal to a frequency interval of f S At a frequency of f LO The comb filter selects different frequency components of the radio frequency signal. The channelization based on the grating filtering is to modulate a radio frequency signal onto a single-frequency optical carrier, and different frequency components of the optical radio frequency signal are selected through the grating narrow linewidth filtering effect.
The use of injection locking techniques can reduce the instantaneous bandwidth of the receiver system to the 1GHz range, thus greatly extending the spectrum utilization.
It should be noted that Wavelength Division Multiplexing (WDM) such as Nyquist Wavelength Division Multiplexing (NWDM) and coherent optical orthogonal wavelength division multiplexing (CO-OFDM) are mainly used as the demultiplexing technique. In general, most of the wavelength division multiplexing systems use a demultiplexer based on an Arrayed Waveguide Grating (AWG) and a Wavelength Selective Switch (WSS). However, these devices do not have sufficient bandwidth resolution to separate comb fingers of optical frequencies in the Free Spectral Range (FSR) <12.5GHz, and, in addition, introduce significant insertion loss, which is typically compensated for by the optical amplifier, which increases the noise of the system. Demultiplexing based on optical injection locking can overcome these disadvantages. This approach enables the selection of closely spaced comb fingers without insertion loss and any constraints on asymmetric channel spacing, and can be used for any type of optical frequency comb. In addition, the active demultiplexer can be regarded as an ultra-low noise amplifier and a gain equalizer operating in a constant power mode, and the Free Spectral Range (FSR) of the active demultiplexer can be tuned, and meanwhile the active demultiplexer has good stability and flexibility. These advantages of injection locking as a demultiplexer can also be applied to receiver systems, resulting in a significant increase in system performance.
Correspondingly, another embodiment of the present invention further provides a microwave photon single optical frequency comb injection-locked channelized receiving method, which adopts the microwave photon single optical frequency comb injection-locked channelized receiving apparatus of the above embodiment, including: the optical carrier unit generates a single-frequency continuous optical carrier and divides the single-frequency continuous optical carrier into a first path of single-frequency continuous optical carrier and a second path of single-frequency continuous optical carrier; the optical frequency comb generating unit receives the first single-frequency continuous optical carrier and generates an optical frequency comb; the demultiplexing unit group demultiplexes the needed optical frequency comb teeth in the optical frequency comb; the double-sideband modulation unit modulates the double-sideband of the received signal received by the receiving antenna onto a second path of single-frequency continuous optical carrier and outputs a modulated optical carrier; and the coherent demodulation module performs coherent demodulation on the modulated optical carrier by taking the demultiplexed optical frequency comb teeth as reference signals.
Specifically, the step of generating a single-frequency continuous optical carrier by the optical carrier unit and dividing the single-frequency continuous optical carrier into a first single-frequency continuous optical carrier and a second single-frequency continuous optical carrier includes: the laser generates a single-frequency continuous optical carrier; the first beam splitting unit splits a single-frequency continuous optical carrier generated by the laser into a first path of single-frequency continuous optical carrier and a second path of single-frequency continuous optical carrier.
Specifically, the channelized receiving method of microwave photon single-optical-frequency comb injection locking further includes: the second beam splitting unit divides the optical frequency comb generated by the optical frequency comb generating unit into a first path of sub optical frequency comb to an Nth path of sub optical frequency comb; the nth demultiplexing unit receives the nth path of sub optical frequency comb output by the second beam splitting unit and outputs nth characteristic comb teeth to the nth coherent demodulation unit; the frequencies from the first characteristic comb tooth to the Nth characteristic comb tooth are different; the third beam splitting unit receives the modulated optical carrier output by the double-sideband modulation unit and divides the modulated optical carrier into a first path of sub-modulated optical carrier to an Nth path of sub-modulated optical carrier, and signals of all paths of sub-modulated optical carriers from the first path of sub-modulated optical carrier to the Nth path of sub-modulated optical carrier are the same; the third beam splitting unit outputs the nth path of sub-modulation optical carrier to the nth coherent demodulation unit; the nth coherent demodulation unit uses the nth characteristic comb tooth as a reference signal to perform coherent demodulation on the modulated optical carrier.
The above description is intended to be illustrative of the present invention and should not be taken as limiting the invention, but rather, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.
Claims (9)
1. A microwave photonic single-optical-frequency comb injection-locked channelized receiver apparatus, comprising:
the optical carrier unit is used for generating a single-frequency continuous optical carrier and dividing the single-frequency continuous optical carrier into a first single-frequency continuous optical carrier and a second single-frequency continuous optical carrier;
the optical frequency comb generating unit is used for receiving the first single-frequency continuous optical carrier and generating an optical frequency comb; the optical frequency comb generating unit includes: a microwave source for generating a single frequency microwave signal; 3, a frequency multiplier; the output end of the microwave source is connected with the input end of a frequency 3 multiplier and the radio frequency input end of a third intensity modulator, the output end of the frequency 3 multiplier is connected with the radio frequency input end of the first intensity modulator, the radio frequency input end of the second intensity modulator, the radio frequency input end of the first phase modulator and the radio frequency input end of the second phase modulator, the light output end of the first phase modulator is connected with the light input end of the second phase modulator, the light output end of the second phase modulator is connected with the light input end of the first intensity modulator, the light output end of the first intensity modulator is connected with the light input end of the second intensity modulator, the light output end of the second intensity modulator is connected with the light input end of the third intensity modulator, the optical output end of the third intensity modulator is used as the output end of the optical frequency comb generating unit;
the input end of the second beam splitting unit is connected with the output end of the optical frequency comb generating unit, and the second beam splitting unit is used for splitting the optical frequency comb into a first path of optical frequency comb to an Nth path of optical frequency comb;
the demultiplexing unit group is used for demultiplexing the needed optical frequency comb teeth in the optical frequency comb; the demultiplexing unit group comprises a first demultiplexing unit and an Nth demultiplexing unit, the first demultiplexing unit is used for outputting a first characteristic comb tooth, the Nth demultiplexing unit is used for outputting an Nth characteristic comb tooth, and the frequencies of the first characteristic comb tooth to the Nth characteristic comb tooth are different; the second beam splitting unit is used for outputting the nth path of sub optical frequency comb to the nth demultiplexing unit; n is an integer of 1 or more and N or less;
the first demultiplexing unit comprises a first distributed feedback laser and a first circulator, the Nth demultiplexing unit comprises an Nth distributed feedback laser and an Nth circulator, the Nth demultiplexing unit comprises an N-th distributed feedback laser and an N-th circulator, the N-th circulator is used for injecting the N-th sub-optical frequency comb into the N-th distributed feedback laser, the N-th circulator is also used for outputting N-th characteristic comb teeth, and the locking frequencies from the first distributed feedback laser to the N-th distributed feedback laser are different; the nth distributed feedback laser has a locking frequency f DFB (n)，f DFB (n)＝f c +nf m ；f c The frequency of the first path of single-frequency continuous optical carrier wave; the optical frequency comb generating unit comprises a microwave source f m The frequency of the microwave signal output by the microwave source;
a receiving antenna;
the double-sideband modulation unit is used for modulating the double sidebands of the received signals received by the receiving antenna onto a second path of single-frequency continuous optical carrier and outputting modulated optical carriers;
the third beam splitting unit is used for receiving the modulated optical carrier output by the double-sideband modulation unit and dividing the modulated optical carrier into a first path of sub-modulated optical carrier to an Nth path of sub-modulated optical carrier, wherein the signals of all paths of sub-modulated optical carriers from the first path of sub-modulated optical carrier to the Nth path of sub-modulated optical carrier are the same;
the coherent demodulation module is used for carrying out coherent demodulation on the modulated optical carrier by taking the demultiplexed optical frequency comb teeth as reference signals; the coherent demodulation module comprises a first coherent demodulation unit to an Nth coherent demodulation unit; n is an integer greater than or equal to 2; the nth demultiplexing unit is suitable for outputting nth characteristic comb teeth to the nth coherent demodulation unit; the third beam splitting unit is used for outputting the nth path of sub-modulation optical carrier to the nth coherent demodulation unit.
2. The microwave photonic single-optical-frequency comb injection-locked channelized receiving device of claim 1, wherein said optical carrier unit comprises a laser and a first beam splitting unit, said laser is used for generating a single-frequency continuous optical carrier, said first beam splitting unit is used for splitting the single-frequency continuous optical carrier generated by the laser into a first single-frequency continuous optical carrier and a second single-frequency continuous optical carrier.
3. The microwave photonic single-optical-frequency comb injection-locked channelized receiving device as claimed in claim 1, wherein the nth coherent demodulation unit comprises: an nth 90-degree optical bridge, an nth first balanced photodetector, an nth second balanced photodetector, a 2n-1 low-pass filter, a 2 nth low-pass filter, an nth first analog-to-digital converter and an nth second analog-to-digital converter;
a first input end of the nth 90-degree optical bridge is connected with an output end of the nth demultiplexing unit, a second input end of the nth 90-degree optical bridge is connected with an nth output end of the third beam splitting unit, and the nth output end of the third beam splitting unit is suitable for outputting nth sub-modulation optical carrier;
a first output end of the nth 90-degree optical bridge and a second output end of the nth 90-degree optical bridge are connected with an input end of the nth first photoelectric balanced detector, and a third output end of the nth 90-degree optical bridge and a fourth output end of the nth 90-degree optical bridge are connected with an input end of the nth second photoelectric balanced detector;
the nth first photoelectric balanced detector outputs an nth first electric signal to the 2n-1 low-pass filter, and the nth second photoelectric balanced detector outputs an nth second electric signal to the 2n low-pass filter;
the output end of the 2n-1 low-pass filter is connected with the input end of the nth first analog-to-digital converter, and the output end of the 2n low-pass filter is connected with the input end of the nth second analog-to-digital converter.
4. The microwave photonic single-optical frequency comb injection-locked channelized receiver device of claim 3 wherein the first output terminal of the n 90 ° optical bridge is adapted to output the first composite output signal, the second output terminal of the n 90 ° optical bridge is adapted to output the second composite output signal, the third output terminal of the n 90 ° optical bridge is adapted to output the third composite output signal, the fourth output terminal of the n 90 ° optical bridge is adapted to output the fourth composite output signal, the first composite output signal is orthogonal to the second composite output signal, and the third composite output signal is orthogonal to the fourth composite output signal.
5. The microwave photonic single-optical-frequency comb injection-locked channelized receiver device as claimed in claim 3, wherein each low-pass filter has a cut-off frequency
The optical frequency comb generating unit comprises a microwave source f m The frequency of the microwave signal output by the microwave source.
6. A microwave photonic single-optical-frequency comb injection-locked channelized receiver device as set forth in claim 3 further comprising: a digital signal processing unit;
the output end of the first analog-to-digital converter to the output end of the Nth first analog-to-digital converter, and the output end of the first second analog-to-digital converter to the output end of the Nth second analog-to-digital converter are connected with the digital signal processing unit;
the digital signal processing unit is adapted to obtain phase information and amplitude information in the received signal.
7. The microwave photonic single-frequency comb injection-locked channelized receiver device of claim 1 wherein said double sideband modulation unit is a mach-zehnder modulator.
8. A microwave photon single optical frequency comb injection-locked channelized receiving method using the microwave photon single optical frequency comb injection-locked channelized receiving device as claimed in any one of claims 1 to 7, comprising:
the optical carrier unit generates a single-frequency continuous optical carrier and divides the single-frequency continuous optical carrier into a first path of single-frequency continuous optical carrier and a second path of single-frequency continuous optical carrier;
the optical frequency comb generating unit receives the first single-frequency continuous optical carrier and generates an optical frequency comb;
the demultiplexing unit group demultiplexes the needed optical frequency comb teeth in the optical frequency comb;
the double-sideband modulation unit modulates the double sidebands of the received signals received by the receiving antenna onto a second path of single-frequency continuous optical carrier and outputs modulated optical carriers;
the coherent demodulation module performs coherent demodulation on the modulated optical carrier by taking the demultiplexed optical frequency comb teeth as reference signals;
the channelized receiving method for the injection locking of the microwave photon single-optical-frequency comb further comprises the following steps: the second beam splitting unit divides the optical frequency comb generated by the optical frequency comb generating unit into a first path of sub optical frequency comb to an Nth path of sub optical frequency comb; the nth demultiplexing unit receives the nth path of sub optical frequency comb output by the second beam splitting unit and outputs nth characteristic comb teeth to the nth coherent demodulation unit; the frequencies from the first characteristic comb tooth to the Nth characteristic comb tooth are different;
the third beam splitting unit receives the modulated optical carrier output by the double-sideband modulation unit and divides the modulated optical carrier into a first path of sub-modulated optical carrier to an Nth path of sub-modulated optical carrier, and signals of all paths of sub-modulated optical carriers from the first path of sub-modulated optical carrier to the Nth path of sub-modulated optical carrier are the same;
the third beam splitting unit outputs the nth path of sub-modulation optical carrier to the nth coherent demodulation unit;
the nth coherent demodulation unit uses the nth characteristic comb as a reference signal to coherently demodulate the modulated optical carrier.
9. The microwave photonic single-optical-frequency comb injection-locked channelized reception method according to claim 8, wherein said optical carrier unit comprises a laser and a first beam splitting unit;
the steps of generating a single-frequency continuous optical carrier by the optical carrier unit and dividing the single-frequency continuous optical carrier into a first single-frequency continuous optical carrier and a second single-frequency continuous optical carrier include: the laser generates a single-frequency continuous optical carrier; the first beam splitting unit splits a single-frequency continuous optical carrier generated by the laser into a first path of single-frequency continuous optical carrier and a second path of single-frequency continuous optical carrier.
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