CN115865207A - Tunable multi-format signal generation device and method based on microwave photons - Google Patents
Tunable multi-format signal generation device and method based on microwave photons Download PDFInfo
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Abstract
The invention provides a tunable multi-format signal generation device based on microwave photons, which comprises a laser, a pulse waveform generator, a signal source, a modulation optical switch, a signal generator and a photoelectric detector, wherein the laser is connected with the pulse waveform generator; the laser sends an optical signal to the modulated optical switch; the pulse waveform generator sends a binary coded signal to the modulation optical switch; the modulation optical switch modulates the phase of the optical signal under the control of the binary coding signal to generate two paths of optical signals with different phase characteristics and outputs the two paths of optical signals to the signal generator; a signal source generates two paths of radio frequency signals and inputs the radio frequency signals to a signal generator; the signal generator carries out intensity modulation on optical signals with different phase characteristics under the action of different radio frequency signals, generates coupled optical signals with different frequencies and formats and inputs the coupled optical signals to the photoelectric detector; the photodetector converts the coupled optical signal into an electrical signal. The invention realizes flexible tunable control and on-demand generation of multi-format signals in the same structure.
Description
Technical Field
The invention belongs to the technical field of microwave photons, and particularly relates to a tunable multi-format signal generation device and method based on microwave photons.
Background
With the increasing demand for improving information security in data transmission, providing interference immunity in military applications, and data capacity in satellite communications, significant challenges are presented to the bandwidth, capacity, and rate of various types of communication systems based on electronic technology. Conventional communication systems transmit a plurality of modulation patterns including FSK, ASK, PSK, etc., wherein the amplitude of ASK signal is zero corresponding to one carrier frequency of FSK signal, and the generation principle is the same as that of FSK signal. However, the modulation code pattern generated by the conventional electronic technology is limited in carrier frequency, switching speed and transmission capacity, and cannot meet the requirements of generating and transmitting broadband high-frequency high-speed large-capacity data signals. Therefore, the multi-format signal becomes an important generation scheme through the technology of photonics, and the bandwidth and the frequency of the generated signal can be effectively improved.
The existing optical domain multi-format signal generation method mainly comprises four major categories of signal generation based on a microwave photon filter, signal generation based on a microwave photon switch, signal generation based on pulse shaping and frequency-time mapping and signal generation based on an injection semiconductor laser. The signal generation method based on the microwave photonic filter mainly controls the microwave photonic filter through coded information, selects optical signals with specific frequency, and outputs electric FSK signals through beat frequency of selected output optical signals and seed light. But the requirements on the bandwidth, the abruptness and the tuning control of the microwave photon filter are strict, and the realization difficulty is higher. The method comprises the following steps that coded information is adopted to control polarization state switching or optical path switching to realize generation of an electric FSK signal based on signal generation of a microwave photon switch, however, the polarization state switching mode needs bias control to ensure orthogonal separation of polarization states, and meanwhile, signal deterioration is easily caused by polarization state deviation; the optical path switching mode realizes the generation of an electric FSK signal by means of optical sideband acquisition and beat frequency, but cannot generate an optical FSK signal on the same structure. FSK and ASK signals are generated by controlling a mode-locked laser and pulse shaping based on signal generation of pulse shaping and frequency-time mapping, but a short pulse mode-locked laser is required to generate an optical pulse string, and fine control of a second-order dispersion element for realizing time-frequency mapping is realized, so that the system is complex and high in cost. A method for generating FSK signals by injection locking of a master-slave laser based on signal generation of an injected semiconductor laser can dynamically control the instantaneous frequency of the generated microwave signal by controlling the injection intensity. However, this method is complicated to implement, and the frequency switching speed is limited due to the locking of the master and slave lasers.
Disclosure of Invention
The technical problem solved by the invention is as follows: the defects of the prior art are overcome, the tunable multi-format signal generation device and method based on microwave photons are provided, and flexible tunable control and on-demand generation of multi-format signals are realized.
The technical solution of the invention is as follows:
a tunable multi-format signal generation device based on microwave photons comprises a laser, a pulse waveform generator, a signal source, a modulation optical switch, a signal generator and a photoelectric detector;
a laser: transmitting an optical signal to a modulated optical switch;
a pulse waveform generator: sending a binary coded signal to a modulated optical switch;
modulation optical switch: modulating the phase of the optical signal under the control of the binary coded signal, generating a first optical signal and a second optical signal with different phase characteristics, and outputting the first optical signal and the second optical signal to a signal generator;
a signal source: generating a radio frequency signal and inputting the radio frequency signal to a signal generator, wherein the signal generator comprises a first signal source generating a first radio frequency signal and a second signal source generating a second radio frequency signal;
a signal generator: the method comprises the steps of modulating the intensity of a first optical signal under the action of a first radio frequency signal, modulating the intensity of a second optical signal under the action of a second radio frequency signal, coupling the intensity-modulated first optical signal and the intensity-modulated second optical signal, and generating coupled optical signals of different formats to be input to a photoelectric detector;
a photoelectric detector: the coupled optical signal is converted into an electrical signal.
Preferably, the modulated optical switch comprises an optical splitter, a first phase modulator, a second phase modulator, an electrical phase shifter and a first 2 × 2 optical coupler;
a light splitter: dividing an optical signal emitted by a laser into two beams which are respectively input to a first phase modulator and a second phase modulator;
electric phase shifter: electrically shifting the binary coded signal transmitted by the pulse waveform generator by pi;
a first phase modulator: directly receiving a binary coded signal sent by a pulse waveform generator, shifting the phase of an input optical signal by theta according to the amplitude of the binary coded signal, and inputting the optical signal to a first 2 x 2 optical coupler;
a second phase modulator: receiving the binary code sequence processed by the electric phase shifter, shifting the phase of the input optical signal by-theta according to the amplitude of the binary code signal, and inputting the optical signal into a first 2 x 2 optical coupler;
first 2 × 2 optical coupler: the optical signal modulated by the second phase modulator is subjected to phase shift of pi/2 and then coupled with the optical signal modulated by the first phase modulator to generate a first optical signal and output to a signal generator;
and phase shifting pi/2 of the optical signal modulated by the first phase modulator, coupling the optical signal modulated by the second phase modulator with the optical signal to generate a second optical signal, and outputting the second optical signal to the signal generator.
Preferably, the signal generator includes a first mach-zehnder modulator, a second mach-zehnder modulator, and a second 2 × 2 optical coupler;
first mach-zehnder modulator: the first optical signal is subjected to intensity modulation under the action of a first radio frequency signal and is input to a second 2 x 2 optical coupler;
second mach-zehnder modulator: the second optical signal is subjected to intensity modulation under the action of a second radio frequency signal and is input to a second 2 x 2 optical coupler;
second 2 × 2 optical coupler: and coupling the first optical signal modulated by the first Mach-Zehnder modulator with the phase shifted by pi/2 with the second optical signal modulated by the second Mach-Zehnder modulator to generate a coupled optical signal, and outputting the coupled optical signal to the photoelectric detector.
Preferably, the first mach-zehnder modulator and the second mach-zehnder modulator operate at a minimum point.
Preferably, the modulating optical switch modulates the phase of the optical signal under the control of the binary coded signal to generate the first optical signal and the second optical signal having different phase characteristics, and specifically includes:
when the binary code is 0, the amplitude of the coded signal enables theta to be = -pi/4, the phase of the first optical signal is 0, and the modulation optical switch only outputs the second optical signal;
when the binary code is 1, the amplitude of the coded signal is theta = pi/4, the phase of the second optical signal is 0, and the modulation optical switch outputs only the first optical signal.
Preferably, the first radio frequency signal and the second radio frequency signal have the same amplitude and phase and different frequencies, the electrical signal output by the photodetector is an electrical domain FSK signal, when the binary code is 0, the frequency of the electrical domain FSK signal is twice the frequency of the second radio frequency signal, and when the binary code is 1, the frequency of the electrical domain FSK signal is twice the frequency of the first radio frequency signal.
Preferably, the amplitude and the frequency of the first radio frequency signal and the second radio frequency signal are the same, the phase difference is pi/2, the electrical signal output by the photodetector is an electrical domain PSK signal, and when the binary code is 0 or 1, the frequency of the electrical domain PSK signal is twice the frequency of the first radio frequency signal or the second radio frequency signal.
Preferably, the modulating optical switch modulates the phase of the optical signal under the control of the binary coded signal to generate the first optical signal and the second optical signal having different phase characteristics, and specifically includes:
when the binary code is 0, the amplitude of the coded signal is enabled to be theta =0, and the amplitude and the phase of the first optical signal and the second optical signal are equal;
when the binary code is 1, the amplitude of the code signal is theta = pi/2, and the first optical signal and the second optical signal have equal amplitude and opposite phase.
Preferably, the first radio frequency signal and the second radio frequency signal have the same amplitude and frequency and have a phase difference of pi/2, and the optical signal output by the signal generator is an optical domain FSK signal.
A tunable multi-format signal generation method based on microwave photons comprises the following steps:
(1) The laser outputs continuous optical signals to the modulation optical switch, and the optical splitter divides the optical signals into two beams which are respectively input to the first phase modulator and the second phase modulator;
(2) The pulse waveform generator outputs two paths of same binary coded signals, one path of the same binary coded signals is directly loaded to the first phase modulator, the other path of the same binary coded signals is loaded to the second phase modulator after being subjected to phase shifting pi/2 by the electric phase shifter, and the first phase modulator enables the phase of an input optical signal to be shifted by theta according to the amplitude of the binary coded signals and inputs the input optical signal to the first 2 x 2 optical coupler; the second phase modulator shifts the phase of the input optical signal by-theta according to the amplitude of the binary coded signal, and inputs the optical signal to the first 2 x 2 optical coupler;
(3) The first 2 x 2 optical coupler shifts the phase of the optical signal modulated by the second phase modulator by pi/2, couples the optical signal modulated by the first phase modulator with the optical signal to generate a first optical signal and outputs the first optical signal to the signal generator; the optical signal modulated by the first phase modulator is subjected to phase shift of pi/2 and then coupled with the optical signal modulated by the second phase modulator to generate a second optical signal, and the second optical signal is output to a signal generator; generating a first optical signal and a second optical signal with different phase characteristics by adjusting the binary coded signal output by the pulse waveform generator;
(4) A first signal source generates a first radio frequency signal and loads the first radio frequency signal to a first Mach-Zehnder modulator; a second signal source generates a second radio frequency signal and loads the second radio frequency signal to a second Mach-Zehnder modulator; the first Mach-Zehnder modulator works at a minimum point, and the first optical signal is input to the second 2 x 2 optical coupler after being subjected to intensity modulation under the action of the first radio-frequency signal; the second Mach-Zehnder modulator works at a minimum point, and the second optical signal is input to the second 2 x 2 optical coupler after intensity modulation is carried out on the second optical signal under the action of the second radio-frequency signal;
(5) The second 2 multiplied by 2 optical coupler shifts the phase of a first optical signal modulated by the first Mach-Zehnder modulator by pi/2, couples the first optical signal with a second optical signal modulated by the second Mach-Zehnder modulator to generate a coupled optical signal, outputs the coupled optical signal to the photoelectric detector, and outputs an electrical signal through the photoelectric detector;
(6) Generating signals of different frequencies and/or formats by adjusting the binary coded signal, the first radio frequency signal and the second radio frequency signal:
electrical domain FSK signal generation: when the binary code is 0, the amplitude of the coded signal is enabled to be theta = -pi/4, the phase of the first optical signal is 0, and the modulation optical switch only outputs the second optical signal; when the binary code is 1, the amplitude of the coded signal is enabled to be theta = pi/4, the phase of the second optical signal is 0, and the modulation optical switch only outputs the first optical signal; adjusting the amplitude and the phase of a first radio frequency signal and a second radio frequency signal to be the same, wherein the frequencies of the first radio frequency signal and the second radio frequency signal are different, the electric signal output by a photoelectric detector is an electric domain FSK signal, when the binary code is 0, the frequency of the electric domain FSK signal is twice of the frequency of the second radio frequency signal, and when the binary code is 1, the frequency of the electric domain FSK signal is twice of the frequency of the first radio frequency signal;
electrical domain PSK signal generation: when the binary code is 0, the amplitude of the coded signal is enabled to be theta = -pi/4, the phase of the first optical signal is 0, and the modulation optical switch only outputs the second optical signal; when the binary code is 1, the amplitude of the coded signal is enabled to be theta = pi/4, the phase of the second optical signal is 0, and the modulation optical switch only outputs the first optical signal; adjusting the amplitude and the frequency of the first radio frequency signal and the second radio frequency signal to be the same, wherein the phase difference is pi/2, the electric signal output by the photoelectric detector is an electric domain PSK signal, and when the binary code is 0 or 1, the frequency of the electric domain PSK signal is twice that of the first radio frequency signal or the second radio frequency signal;
optical domain FSK signal generation: when the binary code is 0, the amplitude of the coded signal is enabled to be theta =0, and the amplitude and the phase of the first optical signal and the second optical signal are equal; when the binary code is 1, the amplitude of the code signal is enabled to be theta = pi/2, and the amplitude of the first optical signal is equal to that of the second optical signal, and the phases of the first optical signal and the second optical signal are opposite; and adjusting the amplitude and the frequency of the first radio frequency signal and the second radio frequency signal to be the same, and adjusting the phase difference to be pi/2, wherein the optical signal output by the signal generator is an optical domain FSK signal.
Compared with the prior art, the invention has the advantages that:
(1) The invention carries out certain control on the modulation optical switch constructed by combining parallel PM with an optical coupler, particularly utilizes the coded information of a binary digit sequence to control the working state of the modulation optical switch, so that the output light of the modulation optical switch is transmitted according to the coded information in a specified path according to certain characteristics, the orthogonal separation of polarization states is ensured without polarization control, and the phenomenon of signal deterioration caused by the deviation of the polarization states can not occur; meanwhile, the design of an integrated chip is easy, and the method has the advantages of simplicity in realization, stable performance, good universality and the like;
(2) The invention controls the modulation optical switch through the coding information, so that the output light of the modulation optical switch realizes the generation of a microwave frequency doubling FSK signal, a microwave PSK signal and an optical FSK signal according to the coding; the generation of electric domain FSK and PSK signals and the generation of optical domain FSK signals are realized on the same structure, so that the on-demand generation of flexible tunable multi-format signals is realized; and various optical devices such as a mode-locked laser, an optical comb filter, polarization control, frequency-time mapping, a Faraday rotator mirror and the like are not needed, so that the system structure is greatly simplified, and the stability and the reliability of the system are enhanced.
Drawings
FIG. 1 is a schematic diagram of a tunable multi-format signal generation apparatus and method based on microwave photons according to the present invention;
fig. 2 is a schematic diagram of a frequency-doubled electrical FSK signal generation output result according to embodiment 1 of the present invention;
fig. 3 is a schematic diagram of an output result of 6GHz coherent demodulation of a frequency-doubled electrical FSK signal according to embodiment 1 of the present invention;
fig. 4 is a schematic diagram of an output result of 10GHz coherent demodulation of a frequency-doubled electrical FSK signal according to embodiment 1 of the present invention;
fig. 5 is a schematic diagram of an output result generated by a frequency-doubled electrical PSK signal according to embodiment 1 of the present invention;
fig. 6 is a schematic diagram of an output result of 8GHz coherent demodulation of a frequency-doubled electrical PSK signal according to embodiment 1 of the present invention;
fig. 7 is a schematic diagram of an optical FSK signal generation output result according to embodiment 2 of the present invention;
fig. 8 is a schematic diagram of an output result of 6GHz coherent demodulation of an optical FSK signal according to embodiment 2 of the present invention;
fig. 9 is a schematic diagram of an output result of 10GHz coherent demodulation of an optical FSK signal according to embodiment 2 of the present invention.
Detailed Description
The features and advantages of the present invention will become more apparent and appreciated from the following detailed description of the invention.
The invention provides a tunable multi-format signal generation device and method based on microwave photons. Controlling the modulation optical switch through the coded information, so that the output light of the modulation optical switch is transmitted according to the coded information in a specified path according to certain characteristics; the parallel intensity modulator is combined with direct-current bias point control, so that the generation of a microwave frequency-doubling FSK signal, a microwave frequency-doubling PSK signal and an optical FSK signal is realized on the same structure, and the flexible tunable control and the on-demand generation of multi-format signals are realized.
As shown in fig. 1, the device for flexibly tuning and controlling and generating a multi-format signal based on microwave photons is jointly completed by a Laser (LD), a pulse waveform generator (PPG), a signal source (MSG), a modulated optical switch, a signal generator and a Photodetector (PD). The modulation optical switch comprises a 3dB optical coupler, two phase modulators (PM 1 and PM 2) and a 2 x 2 optical coupler (OC 1); the signal generator consists of intensity modulators (IM 1 and IM 2) and a 2 x 2 optical coupler (OC 2) arranged in parallel. The laser outputs an upper optical signal and a lower optical signal after passing through the modulation optical switch, the upper optical signal is sent to an upstream MZM (Mach-Zehnder) of the parallel arrangement intensity modulator in the signal generator, namely IM1, the lower optical signal is sent to a downstream MZM (Mach-Zehnder) of the parallel arrangement dual-drive intensity modulator in the optical frequency modulator, namely IM2, the output signals of the IM1 and the IM2 are output after passing through a 2 x 2 optical coupler, one output end of the 2 x 2 optical coupler is grounded, and the other output end is sent to the photoelectric detector to realize photoelectric conversion.
Specifically, the modulated optical switch consists of a 3dB optical coupler, two phase modulators (PM 1 and PM 2) arranged in parallel, an electric Phase Shifter (PS) and a 2 x 2 optical coupler (OC 1), wherein 180-degree electric phase shift is introduced into the electric phase shifter.
Further, the modulated optical switch comprises one optical input port, two electrical input ports and two optical output ports. The optical input port is an optical input port of a 3dB optical coupler in the modulation optical switch, the electrical input port is an electrical input port of a phase modulator in the modulation optical switch, and the optical output port is an optical output port of a modulation optical switch optical coupler OC 1.
Specifically, the signal generator is composed of intensity modulators IM1 and IM2 and an optical coupler OC2 arranged in parallel.
Further, the signal generator comprises two optical input ports, two radio frequency driving input ports, two direct current driving input ports and two optical output ports. The optical input port is an optical input port of the intensity modulator, the radio frequency driving input port is a radio frequency input port of the intensity modulator, the direct current driving input port is a direct current bias input port of the intensity modulator, and the optical output port is an optical output port of the optical coupler OC2 of the signal generator.
The tunable multi-format signal generation device and method based on microwave photons can complete the generation of frequency-doubled electric FSK signals or frequency-doubled electric PSK signals, and specifically comprise the following steps:
the optical signal output by the laser LD is sent to the optical input end of the modulation optical switch;
binary coded information output by the PPG is divided into two paths, one path is directly loaded to one electrical input port of the modulation optical switch, and the other path is loaded to the other electrical input port of the modulation optical switch after passing through the electrical phase shift PS;
the modulation optical switch is controlled by binary coded information output by PPG, which is equivalent to that additional phases theta and-theta are respectively introduced into an uplink branch and a downlink branch of OC1 through phase modulators PM1 and PM2, the values of the additional phases theta and-theta are determined by '0' and '1' coded information, the amplitude of 0 and 1 coded signals is controlled, the corresponding theta is-pi/4 when the '0' code is carried out, the corresponding theta is pi/4 when the '1' code is carried out, therefore, when the coded signal is 0, the optical wave is output from the lower branch of the modulation optical switch, and when the coded signal is 1, the optical wave is output from the upper branch of the modulation optical switch, so that the optical switch performance changed by the coded information is realized; namely, the modulation optical switch is controlled by binary coding information output by PPG to realize the output of an optical wave on-path or off-path; the output signal of the modulation optical switch is sent to the optical input port of the signal generator through the optical output port;
continuous optical signals output by the laser are sent to an optical input port of the modulation optical switch, and are divided into two paths by a 3dB optical coupler of the modulation optical switch and then respectively sent to PM1 and PM2 for phase modulation; assuming that the optical field expression of the continuous optical signal (shown as point a in fig. 1) output by the laser is:
in the formula E 0 And ω c The amplitude and angular frequency of the continuous optical signal are output for the laser, respectively.
The optical field expressions of the output signal (shown as point B in fig. 1) of the continuous optical signal modulated by PM1 and the output signal (shown as point 1C in fig. 1) of the continuous optical signal modulated by PM2 are respectively:
in the formula
The offset phase shift introduced for the phase modulator is determined by the "0", "1" code information of the binary coded signal s (t) loaded onto the phase modulator, which is given by the PPG.
The modulated optical signals of the parallel modulators PM1 and PM2 are coupled and output by a 2 × 2 optical coupler OC1, and an optical field expression of an output signal of an upper branch output port (indicated by a point D in fig. 1) of the 2 × 2 optical coupler is as follows:
the optical field expression of the output signal of the other port (indicated by point E in fig. 1) of the 2 × 2 optical coupler is:
combining the theoretical derivation above, we can get:
when the temperature is higher than the set temperature
At this time, the optical signal is output from only the upper branch (the branch at point D in fig. 1) of the modulation optical switch, and the optical field expression of the output signal of the modulation optical switch is:
when in use
While the optical signal is only branched from the modulated optical switchBranch at point E in fig. 1) output, where the expression of the output optical field of the modulated optical switch is:
the output optical signal of the optical modulator switch is sent to a signal generator where IM1 and IM2 operate at a minimum point.
Assume that the electric field of the RF drive signal for IM1 is represented as:
V RF1 (t)＝Vsinω 1 t
IM1 operates at the minimum point, then the light field expression for the IM1 output signal (indicated by point F in fig. 1) is:
similarly, assume that the electric field of the rf driving signal of IM2 is represented as:
V RF2 (t)＝Vsinω 2 t
IM2 operates at the minimum point, and the light field expression of the IM2 output signal (indicated by point G in fig. 1) is:
in the small signal mode, the light field expressions of the IM1 output signal and the IM2 output signal are simplified as follows:
as can be seen from the above equation, the intensity modulator output optical signal contains only the ± 1 order sideband optical signals. Wherein the content of the first and second substances,
is the modulation index of the input radio frequency signals RF1 and RF 2.
The signal generator output signal optical field is then represented as follows:
the output signal light field of the signal generator obtained after simplification is as follows:
the electric signal output after photoelectric detection is as follows:
as can be seen from the equation, the PD outputs electrical FSK signals at frequencies 2 ω 1 and 2 ω 2.
MSG is adjusted to make the frequency of the RF signals loaded on IM1 and IM2 the same, i.e. omega 1 ＝ω 2 And = ω, the phase is pi/2, then the signal generator output signal optical field is expressed as follows:
the output signal light field of the signal generator obtained after simplification is as follows:
the optical signal output after photoelectric detection is:
as can be seen from the equation, the PD outputs a frequency-doubled electrical PSK signal.
Example 1
It is assumed that the optical operating wavelength is 193.1THz, the output power is 20dBm, the bit rate of binary coded information sent by PPG is 1Gbit/s, the extinction ratio of IM is 30dB, the half-wave voltage of IM is 5V, the extinction ratio of PM is 30dB, and the half-wave voltage of PM is 4V. The binary coded information s (t) = '01010011' output by the PPG is set, and the frequencies of the radio frequency driving signals are 3GHz and 5GHz, respectively. The output result of the frequency-doubled electrical FSK signal obtained according to the present invention is shown in fig. 2, and the output signal includes two frequency components of 6GHz and 10GHz, and the two frequency components are determined by the binary coding information output by the PPG. Coherent demodulation with a 6GHz sine wave, the demodulated output signal is shown in figure 3. Coherent demodulation with a 10GHz sine wave, the demodulated output signal is shown in fig. 4. As can be seen from the figure, the code sequence after demodulation and output is '01010011', the demodulation signal is consistent with the input binary coding information, and therefore the method can generate frequency multiplication electric FSK signals. The binary coded information s (t) = '01010011' output by the PPG is set, the frequencies of the radio frequency driving signals are respectively 4GHz, the output result of the frequency-doubled electrical PSK signal obtained according to the present invention is shown in fig. 5, the output signal includes the frequency component of 8GHz, and the PSK signal output is determined by the binary coded information output by the PPG. Coherent demodulation with an 8GHz sine wave, the demodulated output signal is shown in fig. 6. As can be seen from the figure, the code sequence after demodulation and output is "01010011", and the demodulated signal is consistent with the input binary coded information, so that the method can generate a frequency-doubled electrical PSK signal.
The tunable multi-format signal generation device and method based on microwave photons can complete the generation of optical FSK signals, and specifically comprise the following steps:
the optical signal output by the laser LD is sent to the optical input of the modulated optical switch.
Binary coded information output by the PPG is divided into two paths, one path is directly loaded to one electrical input port of the modulation optical switch, and the other path is loaded to the other electrical input port of the modulation optical switch after passing through the electrical phase shift PS.
The modulation optical switch is controlled by binary coded information output by PPG, which is equivalent to that additional phases theta and-theta are respectively introduced into an uplink branch and a downlink branch of OC1 by phase modulators PM1 and PM2, the values of the additional phases theta and-theta are determined by '0' and '1' coded information, the amplitude of 0 and 1 coded signals is controlled, the corresponding theta is 0 when the '0' code is carried out, the corresponding theta is pi/2 when the '1' code is carried out, therefore, when the coded signals are 0, the light waves output from the upper branch and the lower branch of the modulation optical switch have equal amplitude and the like, and when the coded information is 1, the light waves output from the upper branch and the lower branch of the modulation optical switch have equal amplitude and opposite phase. The output signal of the modulated optical switch is sent to the optical input port of the signal generator through the optical output port.
When the temperature is higher than the set temperature
When the optical signal is output from the upper and lower branches of the modulation optical switch at the same time, and the output signal is equal-amplitude and opposite-phase optical signal, then the expression of the output optical field of the modulation optical switch at this moment is
When theta =0, the optical signal is simultaneously output from the upper and lower branches of the modulation optical switch, and the output signal is an optical signal with equal amplitude and same phase, so that the expression of the output optical field of the modulation optical switch at this time is as follows
That is, the optical signal output by the modulation optical switch has equal amplitude and is in phase or opposite in phase, that is:
the output optical signal of the optical modulator switch is sent to a signal generator where IM1 and IM2 operate at a minimum point. MSG is adjusted to make the frequency of the RF signals loaded on IM1 and IM2 the same, i.e. omega 1 ＝ω 2 = ω, the phase differs by pi/2, the signal generator outputs a signal optical field represented as follows:
the output signal is an optical domain FSK signal, and the signal can be sent to a photoelectric detector to obtain an electric FSK signal after optical heterodyne beat frequency with another laser.
Example 2
The optical working wavelength is 193.1THz, the output power is 20dBm, the bit rate of binary coding information sent by PPG is 1Gbit/s, the extinction ratio of IM is 30dB, the half-wave voltage of IM is 5V, the extinction ratio of PM is 30dB, and the half-wave voltage of PM is 4V. Setting the binary coded information s (t) = '01010011' output by the PPG, setting the frequency of the rf driving signal to 4GHz, respectively, and outputting the optical FSK signal obtained according to the present invention as shown in fig. 7, it can be seen that the output signal includes two components of +1 order and-1 order optical sidebands, and the selection of the two sidebands is determined by the binary coded information s (t) output by the PPG. The output optical signal of the signal generator is then subjected to beat frequency with a laser with the frequency of 193.102THz, and microwave FSK signals with the frequencies of 6GHz and 10GHz can be obtained. Coherent demodulation with a 6GHz sine wave, the demodulated output signal is shown in fig. 8. Coherent demodulation with a 10GHz sine wave, the demodulated output signal is shown in fig. 9. As can be seen from the figure, the code sequence after demodulation and output is "01010011", and the demodulated signal corresponds to the input binary encoded information.
Those skilled in the art will appreciate that those matters not described in detail in the present specification are well known in the art.
Claims (10)
1. A tunable multi-format signal generation device based on microwave photons is characterized by comprising a laser, a pulse waveform generator, a signal source, a modulation optical switch, a signal generator and a photoelectric detector;
a laser: transmitting an optical signal to a modulated optical switch;
a pulse waveform generator: sending a binary coded signal to a modulated optical switch;
modulation optical switch: modulating the phase of the optical signal under the control of the binary coded signal, generating a first optical signal and a second optical signal with different phase characteristics, and outputting the first optical signal and the second optical signal to a signal generator;
a signal source: generating a radio frequency signal and inputting the radio frequency signal to a signal generator, wherein the signal generator comprises a first signal source generating a first radio frequency signal and a second signal source generating a second radio frequency signal;
a signal generator: the method comprises the steps of modulating the intensity of a first optical signal under the action of a first radio frequency signal, modulating the intensity of a second optical signal under the action of a second radio frequency signal, coupling the intensity-modulated first optical signal and the intensity-modulated second optical signal, and generating coupled optical signals of different formats to be input to a photoelectric detector;
a photoelectric detector: the coupled optical signal is converted into an electrical signal.
2. A tunable microwave-photon-based multi-format signal generation apparatus as claimed in claim 1, wherein the modulated optical switch comprises an optical splitter, a first phase modulator, a second phase modulator, an electrical phase shifter and a first 2 x 2 optical coupler;
a light splitter: dividing an optical signal emitted by a laser into two beams which are respectively input to a first phase modulator and a second phase modulator;
electric phase shifter: electrically shifting a binary coded signal sent by a pulse waveform generator by pi;
a first phase modulator: directly receiving a binary coded signal sent by a pulse waveform generator, shifting the phase of an input optical signal by theta according to the amplitude of the binary coded signal, and inputting the binary coded signal to a first 2 x 2 optical coupler;
a second phase modulator: receiving the binary code sequence processed by the electric phase shifter, shifting the phase of the input optical signal by-theta according to the amplitude of the binary code signal, and inputting the optical signal into a first 2 x 2 optical coupler;
a first 2 x 2 optical coupler: the optical signal modulated by the second phase modulator is subjected to phase shift of pi/2 and then coupled with the optical signal modulated by the first phase modulator to generate a first optical signal and output to a signal generator;
and phase shifting pi/2 of the optical signal modulated by the first phase modulator, coupling the optical signal modulated by the second phase modulator with the optical signal to generate a second optical signal, and outputting the second optical signal to the signal generator.
3. The tunable multi-format microwave-photon-based signal generation apparatus of claim 2, wherein the signal generator comprises a first mach-zehnder modulator, a second mach-zehnder modulator, and a second 2 x 2 optical coupler;
first mach-zehnder modulator: the first optical signal is subjected to intensity modulation under the action of a first radio frequency signal and is input to a second 2 x 2 optical coupler;
second mach-zehnder modulator: the second optical signal is subjected to intensity modulation under the action of a second radio frequency signal and is input to a second 2 x 2 optical coupler;
a second 2 × 2 optical coupler: and coupling the first optical signal modulated by the first Mach-Zehnder modulator with the phase shifted by pi/2 with the second optical signal modulated by the second Mach-Zehnder modulator to generate a coupled optical signal, and outputting the coupled optical signal to the photoelectric detector.
4. The tunable multi-format signal generation device based on microwave photons of claim 3, wherein the first Mach-Zehnder modulator and the second Mach-Zehnder modulator operate at a minimum point.
5. The tunable multi-format signal generation device based on microwave photons, according to claim 4, wherein the modulation optical switch modulates the phase of the optical signal under the control of the binary code signal to generate the first optical signal and the second optical signal with different phase characteristics, specifically comprising:
when the binary code is 0, the amplitude of the coded signal is enabled to be theta = -pi/4, the phase of the first optical signal is 0, and the modulation optical switch only outputs the second optical signal;
when the binary code is 1, the amplitude of the code signal is set to θ = pi/4, the phase of the second optical signal is set to 0, and the modulation optical switch outputs only the first optical signal.
6. The tunable multi-format microwave photon-based signal generation device as claimed in claim 5, wherein the first and second RF signals have the same amplitude and phase and different frequencies, and the electrical signal output by the photodetector is an electrical domain FSK signal having twice the frequency of the second RF signal when the binary code is 0 and twice the frequency of the first RF signal when the binary code is 1.
7. The tunable multi-format microwave photon-based signal generating apparatus of claim 5, wherein the first RF signal and the second RF signal have the same amplitude and frequency, are different from each other by pi/2, and the electrical signal output by the photodetector is an electrical PSK signal having a frequency twice that of the first RF signal or the second RF signal when the binary code is 0 or 1.
8. The tunable multi-format signal generation device based on microwave photons, according to claim 4, wherein the modulation optical switch modulates the phase of the optical signal under the control of the binary code signal to generate the first optical signal and the second optical signal with different phase characteristics, and specifically comprises:
when the binary code is 0, the amplitude of the coded signal is enabled to be theta =0, and the amplitude and the phase of the first optical signal and the second optical signal are equal;
when the binary code is 1, the amplitude of the coded signal is theta = pi/2, and the first optical signal and the second optical signal have equal amplitude and opposite phase.
9. The tunable multi-format signal generation device based on microwave photons of claim 8, wherein the amplitudes and frequencies of the first radio frequency signal and the second radio frequency signal are the same, the phase difference is pi/2, and the optical signal output by the signal generator is an optical Frequency Shift Keying (FSK) signal.
10. A tunable multi-format signal generation method based on microwave photons, which adopts the tunable multi-format signal generation device based on microwave photons as claimed in claim 3, and is characterized by comprising the following steps:
(1) The laser outputs continuous optical signals to the modulation optical switch, and the optical splitter divides the optical signals into two beams which are respectively input to the first phase modulator and the second phase modulator;
(2) The pulse waveform generator outputs two paths of same binary coded signals, one path of the same binary coded signals is directly loaded to the first phase modulator, the other path of the same binary coded signals is loaded to the second phase modulator after being subjected to phase shifting pi/2 by the electric phase shifter, and the first phase modulator enables the phase of an input optical signal to be shifted by theta according to the amplitude of the binary coded signals and inputs the input optical signal to the first 2 x 2 optical coupler; the second phase modulator shifts the phase of the input optical signal by-theta according to the amplitude of the binary coding signal, and the optical signal is input to the first 2 x 2 optical coupler;
(3) The first 2 x 2 optical coupler shifts the phase of the optical signal modulated by the second phase modulator by pi/2, couples the optical signal modulated by the first phase modulator with the optical signal to generate a first optical signal and outputs the first optical signal to the signal generator; the optical signal modulated by the first phase modulator is subjected to phase shift of pi/2 and then coupled with the optical signal modulated by the second phase modulator to generate a second optical signal, and the second optical signal is output to a signal generator; generating a first optical signal and a second optical signal with different phase characteristics by adjusting a binary code signal output by a pulse waveform generator;
(4) A first signal source generates a first radio frequency signal and loads the first radio frequency signal to a first Mach-Zehnder modulator; a second signal source generates a second radio frequency signal and loads the second radio frequency signal to a second Mach-Zehnder modulator; the first Mach-Zehnder modulator works at a minimum point, and the first optical signal is input to the second 2 x 2 optical coupler after being subjected to intensity modulation under the action of the first radio-frequency signal; the second Mach-Zehnder modulator works at a minimum point, and the second optical signal is input to the second 2 x 2 optical coupler after intensity modulation is carried out on the second optical signal under the action of the second radio-frequency signal;
(5) The second 2 multiplied by 2 optical coupler shifts the phase of a first optical signal modulated by the first Mach-Zehnder modulator by pi/2, couples the first optical signal with a second optical signal modulated by the second Mach-Zehnder modulator to generate a coupled optical signal, outputs the coupled optical signal to the photoelectric detector, and outputs an electric signal through the photoelectric detector;
(6) Generating signals of different frequencies and/or formats by adjusting the binary coded signal, the first radio frequency signal and the second radio frequency signal:
electrical domain FSK signal generation: when the binary code is 0, the amplitude of the coded signal is enabled to be theta = -pi/4, the phase of the first optical signal is 0, and the modulation optical switch only outputs the second optical signal; when the binary code is 1, the amplitude of the coded signal is enabled to be theta = pi/4, the phase of the second optical signal is 0, and the modulation optical switch only outputs the first optical signal; adjusting the amplitude and the phase of a first radio frequency signal and a second radio frequency signal to be the same, wherein the frequencies of the first radio frequency signal and the second radio frequency signal are different, the electric signal output by a photoelectric detector is an electric domain FSK signal, when the binary code is 0, the frequency of the electric domain FSK signal is twice that of the second radio frequency signal, and when the binary code is 1, the frequency of the electric domain FSK signal is twice that of the first radio frequency signal;
electrical domain PSK signal generation: when the binary code is 0, the amplitude of the coded signal is enabled to be theta = -pi/4, the phase of the first optical signal is 0, and the modulation optical switch only outputs the second optical signal; when the binary code is 1, the amplitude of the coded signal is enabled to be theta = pi/4, the phase of the second optical signal is 0, and the modulation optical switch only outputs the first optical signal; adjusting the amplitude and the frequency of the first radio frequency signal and the second radio frequency signal to be the same, wherein the phase difference is pi/2, the electric signal output by the photoelectric detector is an electric domain PSK signal, and when the binary code is 0 or 1, the frequency of the electric domain PSK signal is twice that of the first radio frequency signal or the second radio frequency signal;
optical domain FSK signal generation: when the binary code is 0, the amplitude of the coded signal is enabled to be theta =0, and the amplitude and the phase of the first optical signal and the second optical signal are equal; when the binary code is 1, the amplitude of the coded signal is enabled to be theta = pi/2, and the amplitude of the first optical signal is equal to that of the second optical signal and the phase of the first optical signal is opposite to that of the second optical signal; and adjusting the amplitude and the frequency of the first radio frequency signal and the second radio frequency signal to be the same, and adjusting the phase difference to be pi/2, wherein the optical signal output by the signal generator is an optical domain FSK signal.
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