CN115733558A - Laser communication method, laser communication receiving end, transmitting end and laser communication system - Google Patents
Laser communication method, laser communication receiving end, transmitting end and laser communication system Download PDFInfo
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Abstract
The present disclosure provides a laser communication method, a laser communication receiving end, a transmitting end and a laser communication system, wherein the method applied to the receiving end comprises the following steps: receiving a target optical signal transmitted by a transmitting end by using a first telescope; processing the target optical signal by using a first polarization beam splitter to obtain first polarized light and second polarized light; processing the polarized light by using a first optical demultiplexer aiming at any one of the first polarized light and the second polarized light to obtain a plurality of first sub-signals with different wavelengths; processing two first sub signals by using a balance detection device aiming at every two first sub signals with the same wavelength to obtain transmission sub signals, wherein the transmission signals comprise a plurality of transmission sub signals with different wavelengths; and processing the plurality of transmission sub-signals by using a digital signal processor to obtain a transmission signal.
Description
Technical Field
The present disclosure relates to the field of laser communication technologies, and in particular, to a laser communication method applied to a receiving end and a transmitting end, a receiving end of laser communication, a transmitting end of laser communication, and a laser communication system.
Background
The coherent laser communication system modulates a signal to be transmitted and loads the modulated signal on an optical carrier, then transmits the modulated signal, a receiving end provides local oscillator light which has the same frequency as the signal light, the same polarization state and the similar phase, and the local oscillator light are subjected to frequency mixing and then are subjected to coherent detection demodulation.
However, in coherent laser communication, signal light and local oscillator light are derived from two different lasers, random phase fluctuation exists, and a receiving end needs to compensate the phase or adjust the phase by adopting a phase-locked loop, so that not only is the complexity of the system increased, but also the sensitivity of the laser communication system is affected.
Disclosure of Invention
In view of this, the embodiments of the present disclosure provide a laser communication method, a receiving end of laser communication, a transmitting end of laser communication, and a laser communication system, which are applied to the receiving end and the transmitting end, respectively.
A first aspect of the embodiments of the present disclosure provides a laser communication method, applied to a receiving end in communication connection with a transmitting end, including:
receiving a target optical signal transmitted by the transmitting end by using a first telescope, wherein the target optical signal is obtained by splitting a beam of an initial light source signal transmitted by the same laser by the transmitting end, modulating the phase of one beam of optical signal obtained by splitting the beam, and then combining the beam with the other beam of optical signal obtained by splitting the beam;
processing the target light signal by using a first polarization beam splitter to obtain first polarized light and second polarized light;
processing the polarized light by using a first optical demultiplexer aiming at any polarized light of the first polarized light and the second polarized light to obtain a plurality of first sub-signals with different wavelengths;
processing two first sub-signals by using a balance detection device aiming at every two first sub-signals with the same wavelength to obtain transmission sub-signals, wherein the transmission signals comprise a plurality of transmission sub-signals with different wavelengths;
and processing a plurality of transmission sub-signals by using a digital signal processor to obtain the transmission signal.
According to an embodiment of the present disclosure, before the first polarization beam splitter processes the target optical signal, the method further includes:
and adjusting the polarization state of the target optical signal by using a polarization controller to obtain an adjusted target optical signal.
According to an embodiment of the present disclosure, before processing the first polarized light by the first optical demultiplexer, the method further includes:
adjusting the polarization state of the first polarized light by using a polarization rotator to obtain adjusted first polarized light, and processing the adjusted first polarized light by using the first optical demultiplexer to obtain a plurality of first split signals with different wavelengths;
wherein, before the processing of the second polarized light by the first optical demultiplexer, the method further comprises:
the second polarized light is processed by an optical amplifier to obtain amplified second polarized light, and the amplified second polarized light is processed by the first optical demultiplexer to obtain a plurality of first split signals with different wavelengths.
According to an embodiment of the present disclosure, the balance detecting apparatus includes a mixer and a balance detector;
wherein, the processing two first sub-signals by the balance detection device to obtain the transmission sub-signal includes:
processing the two first sub-signals with the same wavelength by using the frequency mixer to obtain a frequency mixing optical signal;
and processing the mixed optical signal by using the balance detector to obtain a target electrical signal representing the transmission sub-signal, so that the digital signal processor processes a plurality of target electrical signals to obtain the transmission signal.
A second aspect of the embodiments of the present disclosure provides a coherent laser communication method, applied to a transmitting end in communication connection with a receiving end, including:
processing an initial light source signal generated by the laser by using a second polarization beam splitter to obtain third polarized light and fourth polarized light;
processing the third polarized light by using a second optical demultiplexer to obtain a plurality of second sub-signals with different wavelengths;
for each second sub-signal, processing the transmission sub-signal with the same wavelength and the second sub-signal by using a phase modulator to obtain a modulated second sub-signal, wherein the transmission signal includes a plurality of transmission sub-signals with different wavelengths;
processing a plurality of modulated second sub-signals by using an optical combiner to obtain an initial optical signal;
processing the initial optical signal and the fourth polarized light by using a polarization beam combiner to obtain a target optical signal;
and transmitting the target optical signal by using a second telescope.
According to an embodiment of the present disclosure, the processing the transmission sub-signal and the second sub-signal with the same wavelength by using one phase modulator to obtain the modulated second sub-signal includes:
determining a modulation voltage sequence according to the transmission sub-signal;
and under the condition that the modulation voltage sequence is loaded on the phase modulator, processing the second partial signal by using the phase modulator to obtain the modulated second partial signal, wherein the format of the modulated second partial signal comprises binary phase shift keying or differential phase shift keying.
According to an embodiment of the present disclosure, before processing the initial light source signal by using the second polarization beam splitter, the method further includes:
and processing the initial light source signal by using an optical frequency comb to obtain a multi-wavelength light source signal, and processing the multi-wavelength light source signal by using the second polarization beam splitter.
A third aspect of the embodiments of the present disclosure provides a receiving end for laser communication, where the receiving end is in communication connection with a transmitting end, and the receiving end includes:
the first telescope is used for receiving the target optical signal transmitted by the transmitting end;
the first polarization beam splitter is used for processing the target optical signal to obtain first polarized light and second polarized light;
a first optical demultiplexer for processing either one of the first polarized light and the second polarized light to obtain a plurality of first demultiplexed signals having different wavelengths;
the balance detection device is used for processing every two first sub-signals with the same wavelength to obtain transmission sub-signals, wherein the transmission signals comprise a plurality of transmission sub-signals with different wavelengths;
and the digital signal processor is used for processing a plurality of transmission sub-signals to obtain the transmission signals.
A fourth aspect of the embodiments of the present disclosure provides a transmitting end for laser communication, where the transmitting end is in communication connection with a receiving end, and the transmitting end includes:
a laser for generating an initial light source signal;
the second polarization beam splitter is used for processing the initial light source signal to obtain third polarized light and fourth polarized light;
a second optical demultiplexer for processing the third polarized light to obtain a plurality of second split signals with different wavelengths;
a plurality of phase modulators, each of the phase modulators being configured to process a transmission sub-signal and the second sub-signal having the same wavelength to obtain a modulated second sub-signal, wherein the transmission signal includes a plurality of the transmission sub-signals having different wavelengths;
the optical multiplexer is used for processing a plurality of modulated second sub-signals to obtain an initial optical signal;
a polarization beam combiner for processing the initial optical signal and the fourth polarized light to obtain a target optical signal;
and the second telescope is used for transmitting the target optical signal.
A fifth aspect of an embodiment of the present disclosure provides a laser communication system, including: the receiving end as described above; and a transmitting end as described above.
According to the embodiment of the disclosure, a target optical signal emitted from an emitting end is received, and the target optical signal is obtained by splitting an initial light source signal emitted by the same laser, modulating the phase of one optical signal obtained by splitting the beam, and then combining the optical signal with another optical signal obtained by splitting the beam, so that a receiving end performs wavelength division processing of multiple wavelengths after splitting the target optical signal by using a first polarization beam splitter, so as to analyze a transmission sub-signal in a first sub-signal of each wavelength, and finally realize analysis processing of multicarrier communication. The high transmission rate of the multi-carrier communication and the modes of the systematic beam splitting and the phase modulation in the transmitting end realize the self-homodyne coherent detection of the laser communication and improve the sensitivity of a coherent laser communication system.
Drawings
The above and other objects, features and advantages of the present disclosure will become more apparent from the following description of the embodiments of the present disclosure with reference to the accompanying drawings, in which:
fig. 1 schematically shows a flow chart of a laser communication method applied to a receiving end according to an embodiment of the present disclosure;
fig. 2 schematically shows a flow chart of a laser communication method applied to a transmitting end according to an embodiment of the present disclosure;
fig. 3 schematically shows a block diagram of a receiving end according to an embodiment of the present disclosure; and
fig. 4 schematically shows a block diagram of a transmitting end according to an embodiment of the present disclosure.
Detailed Description
Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings. It should be understood that the description is illustrative only and is not intended to limit the scope of the present disclosure. In the following detailed description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of the embodiments of the disclosure. It may be evident, however, that one or more embodiments may be practiced without these specific details. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present disclosure.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. The terms "comprises," "comprising," and the like, as used herein, specify the presence of stated features, steps, operations, and/or components, but do not preclude the presence or addition of one or more other features, steps, operations, or components.
All terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art unless otherwise defined. It is noted that the terms used herein should be interpreted as having a meaning that is consistent with the context of this specification and should not be interpreted in an idealized or overly formal sense.
Where a convention analogous to "A, B and at least one of C, etc." is used, in general such a construction is intended in the sense one having skill in the art would understand the convention (e.g., "a system having at least one of A, B and C" would include, but not be limited to, systems that have a alone, B alone, C alone, a and B together, a and C together, B and C together, and/or A, B, C together, etc.).
Fig. 1 schematically shows a flowchart of a laser communication method applied to a receiving end according to an embodiment of the present disclosure.
The coherent laser communication method is applied to a receiving end in communication connection with a transmitting end, and as shown in fig. 1, the laser communication method includes operations S101 to S105.
In operation S101, a target optical signal transmitted by a transmitting end is received by using a first telescope, where the target optical signal is obtained by splitting a beam of an initial light source signal transmitted by the same laser by the transmitting end, performing phase modulation on one optical signal obtained by splitting the beam, and then combining the optical signal with another optical signal obtained by splitting the beam.
In operation S102, the target optical signal is processed by using a first polarization beam splitter to obtain first polarized light and second polarized light.
In operation S103, for any one of the first polarized light and the second polarized light, the polarized light is processed by a first optical splitter to obtain a plurality of first split signals with different wavelengths.
In operation S104, for every two first partial signals with the same wavelength, the two first partial signals are processed by using a balanced detection apparatus to obtain a transmission sub-signal, where the transmission signal includes a plurality of transmission sub-signals with different wavelengths.
In operation S105, the plurality of transmission sub-signals are processed by the digital signal processor to obtain a transmission signal.
According to an embodiment of the present disclosure, the first telescope may refer to an optical telescope, which may be used to acquire the optical signal emitted by the transmitting end. The transmission signal sent by the transmitting terminal is coupled in the target optical signal. The transmission signal may represent data, such as text, passwords, etc., that needs to be transmitted at the receiving end and the transmitting end.
According to an embodiment of the present disclosure, a first Polarization Beam Splitter (PBS) performs Polarization Beam splitting on a target light signal, so as to obtain two paths of light with orthogonal Polarization states, that is, a first Polarization light with an X Polarization state and a second Polarization light with a Y Polarization state, and for both the first Polarization light and the second Polarization light, a first optical Splitter is used to process the first Polarization light and the second Polarization light, so as to obtain a first sub signal corresponding to a plurality of different wavelengths of the first Polarization light and a first sub signal corresponding to a plurality of different wavelengths of the second Polarization light.
According to the embodiment of the disclosure, the plurality of first sub-signals corresponding to different polarized light are subjected to wavelength pairing, and two first sub-signals with the same wavelength are transmitted to the balance detection device for beat frequency processing, so that the optical signal is converted into an electrical signal, and thus detection data, i.e. a transmission sub-signal, with the wavelength can be obtained. Finally, a plurality of transmission sub-signals are demodulated by a Digital Signal Processor (DSP), and then complete transmission signals can be obtained.
According to the embodiment of the disclosure, a target optical signal emitted from an emitting end is received, and the target optical signal is obtained by splitting an initial light source signal emitted by the same laser, modulating the phase of one optical signal obtained by splitting the beam, and then combining the optical signal with another optical signal obtained by splitting the beam, so that a receiving end performs wavelength division processing of multiple wavelengths after splitting the target optical signal by using a first polarization beam splitter, so as to analyze a transmission sub-signal in a first sub-signal of each wavelength, and finally realize analysis processing of multicarrier communication. The high transmission rate of the multi-carrier communication and the mode of the uniform beam splitting and the phase modulation in the transmitting end realize the self-homodyne coherent detection of the laser communication and improve the sensitivity of the coherent laser communication system.
According to the embodiment of the present disclosure, before the first polarization beam splitter processes the target optical signal, the method further includes the following operations:
and adjusting the polarization state of the target optical signal by using a polarization controller to obtain the adjusted target optical signal.
According to the embodiment of the disclosure, a Polarization Controller (PC) may finely adjust the Polarization state of a target optical signal, and may avoid crosstalk between an X Polarization state and a Y Polarization state in the target optical signal, so as to obtain the target optical signal after Polarization state fine adjustment, and the use of the Polarization Controller is helpful to improve the accuracy of an analysis result of a transmission signal.
According to an embodiment of the present disclosure, before processing the first polarized light with the first optical demultiplexer, the following operations are further included:
the polarization rotator is used for adjusting the polarization state of the first polarized light to obtain adjusted first polarized light, and the first optical demultiplexer is used for processing the adjusted first polarized light to obtain a plurality of first sub-signals with different wavelengths.
According to an embodiment of the present disclosure, a Polarization Beam Rotator (PBR) may rotate the Polarization state of the first polarized light by 90 degrees, so that the first polarized light and the second polarized light after the Polarization state is rotated have the same Polarization state, so as to achieve accurate analytic detection of the transmission signal in the target optical signal.
According to an embodiment of the present disclosure, before processing the second polarized light with the first optical demultiplexer, the method further includes:
the second polarized light is processed by the optical amplifier to obtain amplified second polarized light, and the amplified second polarized light is processed by the first optical demultiplexer to obtain a plurality of first split signals with different wavelengths.
According to an embodiment of the present disclosure, an Optical Amplifier (EDFA) may amplify the second polarized light, so that the first Optical splitter may perform a wavelength division process on the amplified second polarized light.
According to an embodiment of the present disclosure, the Balance detection apparatus includes a mixer (Hybird) and a Balance Photo Detector (BPD).
According to the embodiment of the present disclosure, processing the two first sub-signals by using the balanced detection device to obtain the transmission sub-signal includes the following operations:
and processing the two first sub-signals with the same wavelength by using a mixer to obtain a mixed optical signal.
And processing the mixed optical signal by using the balance detector to obtain a target electric signal representing the transmission sub-signal, so that the digital signal processor processes the plurality of target electric signals to obtain a transmission signal.
According to the embodiment of the disclosure, two first sub-signals with the same wavelength are input into a 180 ° mixer together to output a mixed optical signal, and then the mixed optical signal is input into a balance detector, the balance detector can convert the optical signal into an electrical signal, so that a target electrical signal of the transmission sub-signal can be obtained, and a digital signal processor is used to demodulate and process a plurality of target electrical signals corresponding to different transmission sub-signals, so that the transmission signal can be obtained.
Fig. 2 schematically shows a flowchart of a laser communication method applied to a transmitting end according to an embodiment of the present disclosure.
The coherent laser communication method is applied to a transmitting end in communication connection with a receiving end, and as shown in fig. 2, the method includes operations S201 to S206.
In operation S201, the initial light source signal generated by the laser is processed by the second polarization beam splitter to obtain third polarized light and fourth polarized light.
In operation S202, the third polarized light is processed by the second optical splitter to obtain a plurality of second split signals with different wavelengths.
In operation S203, for each second sub-signal, a phase modulator is used to process the transmission sub-signal and the second sub-signal with the same wavelength, so as to obtain a modulated second sub-signal, where the transmission signal includes a plurality of transmission sub-signals with different wavelengths.
In operation S204, the plurality of modulated second sub-signals are processed by the optical combiner to obtain an initial optical signal.
In operation S205, the original optical signal and the fourth polarized light are processed by a polarization beam combiner to obtain a target optical signal.
In operation S206, a target light signal is transmitted using the second telescope.
According to an embodiment of the present disclosure, the laser may include an External Cavity Laser (ECL).
According to an embodiment of the present disclosure, a laser continuously emits a narrow linewidth range of optical carriers (i.e., an initial light source signal), which can be split into a third polarized light (X-polarized state) and a fourth polarized light (Y-polarized state) with orthogonal polarization states by processing the initial light source signal with a second polarization beam splitter. The third polarized light in the X polarization state is processed by the second optical demultiplexer (the third polarized light may be used as an optical carrier), so that a plurality of second sub-signals with different wavelengths can be obtained, and for each second sub-signal, a transmission sub-signal with the same wavelength as that of the second sub-signal is modulated on the second sub-signal by a phase modulator, so that one modulated second sub-signal (signal light) is obtained.
According to the embodiment of the disclosure, after each second sub-signal is modulated, an optical combiner may combine a plurality of modulated second sub-signals to obtain an initial optical signal, a polarization beam combiner may combine the initial optical signal and a fourth polarized light (a third polarized light may be used as a local oscillator light) to obtain a target optical signal, and a second telescope may finally transmit the target optical signal to a receiving end for data transmission.
According to the embodiment of the disclosure, after an initial light source signal generated by the same laser is split by the second polarization beam splitter, one of the polarized lights is subjected to wave-splitting carrier communication by the wave splitter, the phase modulator and the combiner, and the second light signal loaded with a transmission signal and the second polarized light are combined by the polarization beam combiner and then transmitted, so that self-homodyne coherent detection based on polarization transmission is realized, the sensitivity of a coherent laser communication system is improved, and meanwhile, the use of multi-carrier communication enables the interference of adjacent channels to be small, and the data transmission rate of laser communication is improved.
According to the embodiment of the present disclosure, processing the transmission sub-signal and the second sub-signal with the same wavelength by using one phase modulator to obtain the modulated second sub-signal includes the following operations:
the modulation voltage sequence is determined from the transmission sub-signals. And under the condition that the Phase modulator is loaded with the modulation voltage sequence, processing the second division signal by using the Phase modulator to obtain a modulated second division signal, wherein the format of the modulated second division signal comprises Binary Phase Shift Keying (BPSK) or Differential Phase Shift Keying (DPSK).
According to the embodiment of the present disclosure, before the transmission sub-signal is loaded on the second sub-signal, a modulation voltage sequence needs to be determined according to the transmission sub-signal, and the modulation voltage sequence is loaded on the corresponding phase modulator, so that the phase modulator modulates the second sub-signal based on the modulation voltage sequence to obtain the modulated second sub-signal.
In an exemplary embodiment, the transmission sub-signal may be viewed as a series of binary characters, and the voltage values corresponding to the characters are generated from the corresponding characters, so that the modulation voltage sequence of the transmission sub-signal may be generated.
According to the embodiment of the present disclosure, before processing the initial light source signal by using the second polarization beam splitter, the following operations are further included:
and processing the initial light source signal by using the optical frequency comb to obtain a multi-wavelength light source signal, and processing the multi-wavelength light source signal by using the second polarization beam splitter.
According to the embodiment of the disclosure, the initial light source signal is processed by using the Optical Frequency Comb (OFC) to obtain the multi-wavelength light source signal, the frequency interval between lights with different wavelengths in the multi-wavelength light source signal is fixed, the coherence is good, and the communication quality of laser communication can be improved.
Fig. 3 schematically shows a block diagram of a receiving end according to an embodiment of the present disclosure.
The receiving end 100 of the laser communication is connected to the transmitting end 200 in communication, as shown in fig. 3, the receiving end 100 includes a first telescope 110, a first polarization beam splitter 120, a first optical splitter 130, a balance detection device 140, and a digital signal processor 150.
The first telescope 110 is used for receiving the target optical signal transmitted by the transmitting end 200.
The first polarization beam splitter 120 is configured to process the target light signal to obtain a first polarized light and a second polarized light.
The first optical demultiplexer 130 is configured to process any one of the first polarized light and the second polarized light to obtain a plurality of first sub-signals with different wavelengths.
And the balance detection device 140 is configured to process the first sub-signal with the same wavelength every two wavelengths to obtain a transmission sub-signal, where the transmission signal includes a plurality of transmission sub-signals with different wavelengths.
The digital signal processor 150 is configured to process the plurality of transmission sub-signals to obtain a transmission signal.
According to the embodiment of the present disclosure, a target optical signal transmitted from the transmitting end 200 is received, where the target optical signal is obtained by splitting an initial light source signal transmitted by the same laser 210, performing phase modulation on one optical signal obtained by splitting the beam, and then combining the optical signal with another optical signal obtained by splitting the beam, so that the receiving end 100 performs wavelength division processing on multiple wavelengths after splitting the target optical signal by using the first polarization beam splitter 120, so as to analyze a transmission sub-signal in a first sub-signal of each wavelength, and finally implement analysis processing of multicarrier communication. The high transmission rate of the multicarrier communication and the way of the uniform beam splitting and the phase modulation in the transmitting end 200 realize the self-homodyne coherent detection of the laser communication and improve the sensitivity of the coherent laser communication system.
According to an embodiment of the present disclosure, the receiving end 100 further includes at least one of a polarization controller 160, a polarization rotator 170, and an optical amplifier 180.
The polarization controller 160 is configured to adjust a polarization state of the target optical signal to obtain an adjusted target optical signal.
The polarization rotator 170 is configured to adjust a polarization state of the first polarized light to obtain an adjusted first polarized light, and to process the adjusted first polarized light by using the first optical splitter 130 to obtain a plurality of first split signals with different wavelengths.
The optical amplifier 180 is configured to process the second polarized light to obtain an amplified second polarized light, and process the amplified second polarized light by using the first optical splitter 130 to obtain a plurality of first sub-signals with different wavelengths.
According to an embodiment of the present disclosure, the balanced detection device 140 includes a mixer 141 and a balanced detector 142.
The mixer 141 is configured to process the two first sub-signals with the same wavelength to obtain a mixed optical signal.
And a balance detector 142 for processing the mixed optical signal to obtain a target electrical signal representing the transmission sub-signal, so that the digital signal processor 150 processes the plurality of target electrical signals to obtain the transmission signal.
Fig. 4 schematically shows a block diagram of a transmitting end 200 according to an embodiment of the present disclosure.
The transmitting end 200 of the laser communication is communicatively connected to the receiving end 100, as shown in fig. 4, the transmitting end 200 includes a laser 210, a second polarization beam splitter 220, a second optical splitter 230, a plurality of phase modulators 240, an optical combiner 250, a polarization beam combiner 260, and a second telescope 270.
A laser 210 for generating an initial light source signal.
And a second polarization beam splitter 220, configured to process the initial light source signal to obtain third polarized light and fourth polarized light.
And a second optical demultiplexer 230, configured to process the third polarized light, so as to obtain a plurality of second sub-signals with different wavelengths.
And a plurality of phase modulators 240, wherein each phase modulator 240 is configured to process the transmission sub-signal and the second sub-signal with the same wavelength to obtain a modulated second sub-signal, and the transmission signal includes a plurality of transmission sub-signals with different wavelengths.
And an optical combiner 250 for processing the plurality of modulated second sub-signals to obtain an initial optical signal.
And the polarization beam combiner 260 is configured to process the initial optical signal and the fourth polarized light to obtain a target optical signal.
And a second telescope 270 for transmitting the target optical signal.
According to the embodiment of the disclosure, after an initial light source signal generated by the same laser 210 is split by the second polarization beam splitter 220, one of the polarized lights is subjected to carrier communication of a split band by the wave splitter, the phase modulator 240 and the wave combiner, and the second light signal loaded with a transmission signal and the second polarized light are combined by the polarization beam combiner 260 and then transmitted, so that self-homodyne coherent detection based on polarization transmission is realized, the sensitivity of a coherent laser communication system is improved, and meanwhile, the use of multi-carrier communication enables the interference of adjacent channels to be small, and the data transmission rate of laser communication is improved.
According to the embodiment of the present disclosure, processing the transmission sub-signal and the second sub-signal with the same wavelength by using one phase modulator 240 to obtain the modulated second sub-signal includes the following operations:
the modulation voltage sequence is determined from the transmission sub-signals. Under the condition that the phase modulator 240 loads the modulation voltage sequence, the phase modulator 240 is utilized to process the second sub-signal, so as to obtain a modulated second sub-signal, wherein the format of the modulated second sub-signal includes binary phase shift keying or differential phase shift keying.
According to an embodiment of the present disclosure, the transmitting end 200 further includes an optical frequency comb 280.
And an optical frequency comb 280 for processing the initial light source signal to obtain a multi-wavelength light source signal, so as to process the multi-wavelength light source signal by using the second polarization beam splitter 220.
According to an embodiment of the present disclosure, a laser communication system includes: a receiving end 100 as described above and a transmitting end 200 as described above.
According to an embodiment of the present disclosure, the signal light E in the transmitting end 200 s And local oscillator light E Lo Can be expressed by formula (1) and formula (2):
wherein A is s 、ω s 、
A Lo 、ω Lo 、
The amplitude, frequency and phase of the signal light and the amplitude, frequency and phase of the local oscillator light respectively, j is a coefficient, and t is time.
According to the embodiment of the present disclosure, the mixer 141 in the receiving end 100 processes the two first sub-signals with different polarization states but the same wavelength, and outputs the optical field E of the mixed optical signal 1 And E 2 Can be expressed by formula (3) and formula (4):
according to the embodiment of the present disclosure, the balanced detector 142 is composed of two photo detectors and a differential circuit, and the photo currents output by the two photo detectors and the differential circuit are respectively I according to the square rate detection principle of the photo detectors 1 (t)、I 2 (t) and I (t).
Wherein R is the responsivity of the photodetector, omega IF ＝ω s -ω Lo Which is the frequency difference between the signal light and the local oscillator light.
According to the embodiment of the present disclosure, the local oscillator light and the signal light come from the same laser 210, so ω is IF =0, and the current output by the digital signal processor 150 is as shown in equation (8).
According to the embodiment of the disclosure, as can be seen from formula (8), the subtraction between the balanced received dc component and the noise is suppressed, and the ac component containing the modulation information is retained, so that the transmission signal can be recovered, and the homodyne coherent detection based on polarization transmission is realized.
According to the embodiment of the present disclosure, a target optical signal transmitted from the transmitting end 200 is received, and the target optical signal is obtained by splitting an initial light source signal transmitted by the same laser 210, performing phase modulation on one optical signal obtained by splitting the beam, and then combining the optical signal with another optical signal obtained by splitting the beam, so that the receiving end 100 performs wavelength division processing of multiple wavelengths after splitting the target optical signal by using the first polarization beam splitter 120, so as to analyze a transmission sub-signal in a first sub-signal of each wavelength, and finally implement analysis processing of multicarrier communication. The high transmission rate of the multicarrier communication and the way of the systematic beam splitting and phase modulation in the transmitting end 200 realize the self-homodyne coherent detection of the laser communication system, and improve the sensitivity of the coherent laser communication system. Meanwhile, the structure of the laser communication system is simpler, and the cost of the laser communication system is favorably reduced.
The embodiments of the present disclosure are described above. However, these examples are for illustrative purposes only and are not intended to limit the scope of the present disclosure. Although the embodiments are described separately above, this does not mean that the measures in the embodiments cannot be used in advantageous combination. The scope of the disclosure is defined by the appended claims and equivalents thereof. Various alternatives and modifications can be devised by those skilled in the art without departing from the scope of the present disclosure, and such alternatives and modifications are intended to be within the scope of the present disclosure.
Claims (10)
1. A coherent laser communication method is applied to a receiving end which is in communication connection with a transmitting end, and comprises the following steps:
receiving a target optical signal transmitted by the transmitting end by using a first telescope, wherein the target optical signal is obtained by splitting a beam of an initial light source signal transmitted by the same laser by the transmitting end, modulating the phase of one beam of optical signal obtained by splitting the beam, and then combining the beam with the other beam of optical signal obtained by splitting the beam;
processing the target optical signal by using a first polarization beam splitter to obtain first polarized light and second polarized light;
processing the polarized light by using a first optical demultiplexer aiming at any polarized light of the first polarized light and the second polarized light to obtain a plurality of first sub-signals with different wavelengths;
processing two first sub signals by using a balance detection device aiming at every two first sub signals with the same wavelength to obtain transmission sub signals, wherein the transmission signals comprise a plurality of transmission sub signals with different wavelengths;
and processing the plurality of transmission sub-signals by using a digital signal processor to obtain the transmission signal.
2. The method of claim 1, wherein prior to the processing of the target optical signal by the first polarizing beam splitter, further comprising:
and adjusting the polarization state of the target optical signal by using a polarization controller to obtain an adjusted target optical signal.
3. The method of claim 1, wherein prior to processing the first polarized light with the first optical demultiplexer, further comprising:
adjusting the polarization state of the first polarized light by using a polarization rotator to obtain adjusted first polarized light, and processing the adjusted first polarized light by using the first optical demultiplexer to obtain a plurality of first partial signals with different wavelengths;
wherein, before processing the second polarized light by the first optical demultiplexer, the method further comprises:
and processing the second polarized light by using an optical amplifier to obtain amplified second polarized light, and processing the amplified second polarized light by using the first optical demultiplexer to obtain a plurality of first sub-signals with different wavelengths.
4. The method of claim 1, the balanced detection means comprising a mixer and a balanced detector;
wherein, the processing the two first sub-signals by the balance detection device to obtain the transmission sub-signal comprises:
processing the two first sub-signals with the same wavelength by using the frequency mixer to obtain a frequency mixing optical signal;
and processing the mixed optical signal by using the balance detector to obtain a target electric signal representing the transmission sub-signal, so that the digital signal processor processes a plurality of target electric signals to obtain the transmission signal.
5. A coherent laser communication method is applied to a transmitting end in communication connection with a receiving end, and comprises the following steps:
processing an initial light source signal generated by the laser by using a second polarization beam splitter to obtain third polarized light and fourth polarized light;
processing the third polarized light by using a second optical branching filter to obtain a plurality of second branch signals with different wavelengths;
for each second sub-signal, processing the transmission sub-signal and the second sub-signal with the same wavelength by using a phase modulator to obtain a modulated second sub-signal, wherein the transmission signal comprises a plurality of transmission sub-signals with different wavelengths;
processing the plurality of modulated second sub-signals by using an optical combiner to obtain an initial optical signal;
processing the initial optical signal and the fourth polarized light by using a polarization beam combiner to obtain a target optical signal;
transmitting the target optical signal with a second telescope.
6. The method of claim 5, wherein the processing the transmission sub-signal and the second sub-signal with the same wavelength by using a phase modulator to obtain a modulated second sub-signal comprises:
determining a modulation voltage sequence according to the transmission sub-signal;
and under the condition that the modulation voltage sequence is loaded on the phase modulator, processing the second sub-signal by using the phase modulator to obtain the modulated second sub-signal, wherein the format of the modulated second sub-signal comprises binary phase shift keying or differential phase shift keying.
7. The method of claim 5, wherein prior to processing the initial source signal with the second polarizing beam splitter, further comprising:
and processing the initial light source signal by using an optical frequency comb to obtain a multi-wavelength light source signal, and processing the multi-wavelength light source signal by using the second polarization beam splitter.
8. A receiving end of laser communication, the receiving end being in communication with a transmitting end, the receiving end comprising:
the first telescope is used for receiving the target optical signal transmitted by the transmitting end;
the first polarization beam splitter is used for processing the target optical signal to obtain first polarized light and second polarized light;
the first optical demultiplexer is used for processing any polarized light of the first polarized light and the second polarized light to obtain a plurality of first demultiplexed signals with different wavelengths;
the balance detection device is used for processing every two first sub-signals with the same wavelength to obtain transmission sub-signals, wherein the transmission signals comprise a plurality of transmission sub-signals with different wavelengths;
and the digital signal processor is used for processing the plurality of transmission sub-signals to obtain the transmission signals.
9. A transmitting end for laser communication, the transmitting end being in communication connection with a receiving end, the transmitting end comprising:
a laser for generating an initial light source signal;
the second polarization beam splitter is used for processing the initial light source signal to obtain third polarized light and fourth polarized light;
the second optical demultiplexer is used for processing the third polarized light to obtain a plurality of second sub-signals with different wavelengths;
each phase modulator is used for processing the transmission sub-signals with the same wavelength and the second sub-signal to obtain a modulated second sub-signal, wherein the transmission signal comprises a plurality of transmission sub-signals with different wavelengths;
the optical multiplexer is used for processing the plurality of modulated second sub-signals to obtain an initial optical signal;
the polarization beam combiner is used for processing the initial optical signal and the fourth polarized light to obtain a target optical signal;
and the second telescope is used for transmitting the target optical signal.
10. A laser communication system, comprising:
the receiving end of claim 8; and
the transmitting terminal of claim 9.
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