CN107733525B - Photoelectric mixed oscillation phase-locked loop - Google Patents
Photoelectric mixed oscillation phase-locked loop Download PDFInfo
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- CN107733525B CN107733525B CN201710828946.0A CN201710828946A CN107733525B CN 107733525 B CN107733525 B CN 107733525B CN 201710828946 A CN201710828946 A CN 201710828946A CN 107733525 B CN107733525 B CN 107733525B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/11—Arrangements specific to free-space transmission, i.e. transmission through air or vacuum
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/501—Structural aspects
- H04B10/503—Laser transmitters
- H04B10/505—Laser transmitters using external modulation
- H04B10/5057—Laser transmitters using external modulation using a feedback signal generated by analysing the optical output
- H04B10/50577—Laser transmitters using external modulation using a feedback signal generated by analysing the optical output to control the phase of the modulating signal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/60—Receivers
- H04B10/61—Coherent receivers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/60—Receivers
- H04B10/61—Coherent receivers
- H04B10/615—Arrangements affecting the optical part of the receiver
- H04B10/6151—Arrangements affecting the optical part of the receiver comprising a polarization controller at the receiver's input stage
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Abstract
A photoelectric hybrid oscillation phase-locked loop comprises a signal light source, a local oscillation laser light source, an oscillation signal source, a 2 x 490-degree free space optical bridge, a first balance detector, a second balance detector, a first mixer, a second mixer, a third mixer, a first adder, a second adder, a power detector, a band-pass filter, a low-pass filter, a voltage-controlled oscillator, a first phase shifter, a second phase shifter and a signal receiver. The invention separates the photoelectricity, mixes the light and the light, mixes the electricity and the electricity, and introduces an oscillation signal to carry out phase locking in an electric domain. The method not only reduces the requirement on the local oscillator laser light source and realizes quick locking, but also avoids the influence of crosstalk between the data channel and the phase-locked channel, and does not need the transmission of residual carriers. This is of great significance for future free space coherent optical communications.
Description
Technical Field
The invention relates to free space coherent optical communication, in particular to an optical-electric hybrid oscillation phase-locked loop which is used for a ground receiving device in a satellite-ground laser communication link, demodulates a received signal and outputs a data signal.
Background
The free space coherent optical communication technology is widely concerned by people with the advantage of high receiving sensitivity, but the system has complex problems, especially the requirements on local oscillator laser are high, the error rate is low, and the like, so that the research on the photoelectric hybrid oscillation phase-locked loop is developed. This will have very important significance for free space coherent optical communication.
In the prior art [1] (sun Jianfeng, zhang bo, zhang ning, etc., "an opto-electronic hybrid detection device based on a 2 × 490 ° optical bridge", chinese patent of the invention (application No. CN201610058350.2, publication No. CN105721061A)) adopts optical and optical mixing and electrical mixing, which greatly reduces the requirements for the local oscillator laser, but is affected by crosstalk between the data channel and the phase-locked channel.
Disclosure of Invention
The invention provides an optoelectronic hybrid oscillation phase-locked loop aiming at the application background in inter-satellite or inter-satellite ground coherent laser communication. The invention is realized by separating the photoelectricity, mixing the photoelectricity with the light, and mixing the photoelectricity with the electricity, and introducing an oscillation signal to carry out phase locking in an electric domain. The method not only reduces the requirement on the local oscillator laser light source and realizes quick locking, but also avoids the influence of crosstalk between the data channel and the phase-locked channel, and does not need the transmission of residual carriers. This is of great significance for future free space coherent optical communications.
The technical solution of the invention is as follows:
a photoelectric hybrid oscillation phase-locked loop is characterized by comprising a signal light source, a local oscillation laser light source, an oscillation signal source, a 2 x 490-degree free space optical bridge, a first balance detector, a second balance detector, a first mixer, a second mixer, a third mixer, a first adder, a second adder, a power detector, a band-pass filter, a low-pass filter, a voltage-controlled oscillator, a first phase shifter, a second phase shifter and a signal receiver;
the output end of the signal light source is connected with the first input end of the 2 × 490 ° free space optical bridge, the output end of the local oscillator laser light source is connected with the second input end of the 2 × 490 ° free space optical bridge, the first output end and the second output end of the 2 × 490 ° free space optical bridge are respectively connected with the first input end and the second input end of the first balanced detector, the third output end and the fourth output end are respectively connected with the first input end and the second input end of the second balanced detector, the output end of the first balanced detector is connected with the first input end of the first mixer, the output end of the second balanced detector is connected with the first input end of the second mixer, the output end of the first mixer and the output end of the second mixer are respectively connected with the first input end and the second input end of the first adder, the output end of the first adder is respectively connected with the input end of the power detector and the input end of the signal receiver, the output end of the power detector is connected with the input end of the band-pass filter, the output end of the band-pass filter is connected with the first input end of the third mixer, the output end of the third mixer is connected with the input end of the low-pass filter, the output end of the low-pass filter is connected with the input end of the second adder, the first output end and the second output end of the oscillation signal source are respectively connected with the input end of the second phase shifter and the second input end of the second adder, the output end of the second phase shifter is connected with the second input end of the third mixer, and the output end of the second adder is connected with the voltage-controlled oscillator, the first output end and the second output end of the voltage-controlled oscillator are respectively connected with the second input end of the first mixer and the input end of the first phase shifter, and the output end of the first phase shifter is connected with the second input end of the second mixer;
the signal light generated by the signal light source and the local oscillation light generated by the local oscillation laser light source are mixed through the 2 x 490 degree free space optical bridge, the 2 x 490 degree free space optical bridge outputs four paths of signals, the phases of the four paths of signals are respectively different by 90 degrees, namely, 0 degrees, 90 degrees, 180 degrees and 270 degrees, wherein, 0 degrees and 180 degrees are in-phase signals I, 90 degrees and 270 degrees are quadrature phase signals Q, the first balanced detector is used for detecting I paths of electric signals, the second balanced detector is used for detecting Q paths of signals, the electric signals output by the voltage-controlled oscillator and the I paths of electric signals are subjected to parallel frequency mixing through the first frequency mixer, the electric signals output by the voltage-controlled oscillator are subjected to phase shift through the first phase shifter and then are subjected to frequency mixing with the Q paths of signals through the second frequency mixer, and the two paths of mixed signals are subjected to signal obtaining through the first adder, and receiving by using the signal receiver. Meanwhile, the signal is transmitted to the band-pass filter for filtering after passing through the power detector, the filtered signal and the signal which is sent by the oscillating signal source and is subjected to phase shifting through the second phase shifter are subjected to frequency mixing at the third mixer, the signal after frequency mixing is added with the signal sent by the oscillating signal source at the second adder after passing through the low-pass filter and then fed back to the voltage-controlled oscillator, the frequency of the output signal of the voltage-controlled oscillator is controlled, and phase locking is finally achieved.
Compared with the prior art, the invention has the beneficial effects that:
1. the device is realized by mixing light and mixing electricity and electricity, so that the requirements on the frequency stability, narrow line width and high tuning speed of a local oscillator laser light source are greatly reduced;
2. when the device is used for phase locking, the phase change between the signal light and the local oscillator light is tracked through the electric signal, so that the phase can be quickly locked;
3. in the phase locking process of the device, the influence of crosstalk between the data channel and the phase locking channel is avoided, and transmission of residual carriers is not needed.
Drawings
Fig. 1 is a schematic structural diagram of an opto-electronic hybrid oscillator phase-locked loop according to the present invention.
Detailed Description
The present invention will be described in further detail with reference to the following drawings and examples, but the scope of the present invention should not be limited thereto.
Referring to fig. 1, fig. 1 is a schematic structural diagram of an opto-electric hybrid oscillator phase-locked loop according to the present invention. As can be seen from the figure, the photoelectric hybrid oscillation phase-locked loop of the present invention includes a signal light source 1, a local oscillation laser light source 2, a 2 × 490 ° free space optical bridge 3, a first balanced detector 4, a second balanced detector 5, a first mixer 6, a second mixer 7, a first adder 8, a power detector 9, a signal receiver 10, a band-pass filter 11, a first phase shifter 12, a third mixer 13, a second phase shifter 14, a low-pass filter 15, an oscillation signal source 16, a second adder 17, and a voltage-controlled oscillator 18;
the output end of the signal light source 1 is connected to the first input end of the 2 × 490 ° free space optical bridge 3, the output end of the local oscillator laser light source 2 is connected to the second input end of the 2 × 490 ° free space optical bridge 3, the first output end and the second output end of the 2 × 490 ° free space optical bridge 3 are respectively connected to the first input end and the second input end of the first balanced detector 4, the third output end and the fourth output end are respectively connected to the first input end and the second input end of the second balanced detector 5, the output end of the first balanced detector 4 is connected to the first input end of the first mixer 6, the output end of the second balanced detector 5 is connected to the first input end of the second mixer 7, the output end of the first mixer 6 and the output end of the second mixer 7 are respectively connected to the first input end of the first adder 8 The input end and the second input end are connected, the output end of the first adder 8 is respectively connected with the input end of the power detector 9 and the input end of the signal receiver 10, the output end of the power detector 9 is connected with the input end of the band-pass filter 11, the output end of the band-pass filter 11 is connected with the first input end of the third mixer 13, the output end of the third mixer 13 is connected with the input end of the low-pass filter 15, the output end of the low-pass filter 15 is connected with the input end of the second adder 17, the first output end and the second output end of the oscillating signal source 16 are respectively connected with the input end of the second phase shifter 14 and the second input end of the second adder 17, the output end of the second phase shifter 14 is connected with the second input end of the third mixer 13, the output end of the second adder 17 is connected to the voltage-controlled oscillator 18, the first output end and the second output end of the voltage-controlled oscillator 18 are respectively connected to the second input end of the first mixer 6 and the input end of the first phase shifter 12, and the output end of the first phase shifter 12 is connected to the second input end of the second mixer 7;
the signal light generated by the signal light source 1 and the local oscillator light generated by the local oscillator laser light source 2 are mixed by the 2 × 490 ° free space optical bridge 3, and the 2 × 490 ° free space optical bridge 3 outputs four paths of signals, the phases of which are respectively different by 90 °, i.e. 0 °, 90 °, 180 ° and 270 °, wherein 0 ° and 180 ° are in-phase signals I, and 90 ° and 270 ° are quadrature-phase signals Q. The first balanced detector 4 is used for detecting an I-path electric signal, the second balanced detector 5 is used for detecting a Q-path signal, the electric signal output by the voltage-controlled oscillator 18 and the I-path electric signal are subjected to frequency mixing through the first frequency mixer 6, the electric signal output by the voltage-controlled oscillator 18 is subjected to phase shifting through the first phase shifter 12 and then is subjected to frequency mixing with a Q-path signal through the second frequency mixer 7, and the two paths of frequency mixing signals are received by the signal receiver 10 through signals obtained by the first adder 8. Meanwhile, the signal passes through the power detector 9 and then is transmitted to the band-pass filter 11 for filtering, the filtered signal and the signal which is sent by the oscillating signal source 16 and is subjected to phase shifting by the second phase shifter 14 are mixed at the third mixer 13, the mixed signal passes through the low-pass filter 15 and then is added with the signal sent by the oscillating signal source 16 at the second adder 17 and then is fed back to the voltage-controlled oscillator 18, the frequency of the output signal of the voltage-controlled oscillator is controlled, and finally phase locking is achieved.
The invention separates the photoelectricity, mixes the light and the light, mixes the electricity and the electricity, and introduces an oscillation signal to carry out phase locking in an electric domain. The method and the device not only reduce the requirements on the local oscillator laser light source and realize quick locking, but also are free from the influence of crosstalk between the data channel and the phase-locked channel, and the transmission of residual carriers is not needed. This is of great significance for future free space coherent optical communications.
Claims (1)
1. A photoelectric hybrid oscillation phase-locked loop is characterized by comprising a signal light source (1), a local oscillation laser source (2), a 2 x 490-degree free space optical bridge (3), a first balance detector (4), a second balance detector (5), a first mixer (6), a second mixer (7), a first adder (8), a power detector (9), a signal receiver (10), a band-pass filter (11), a first phase shifter (12), a third mixer (13), a second phase shifter (14), a low-pass filter (15), an oscillation signal source (16), a second adder (17) and a voltage-controlled oscillator (18);
the output end of the signal light source (1) is connected with the first input end of the 2 x 490 degree free space optical bridge (3), the output end of the local oscillator laser light source (2) is connected with the second input end of the 2 x 490 degree free space optical bridge (3), the first output end and the second output end of the 2 x 490 degree free space optical bridge (3) are respectively connected with the first input end and the second input end of the first balanced detector (4), the third output end and the fourth output end are respectively connected with the first input end and the second input end of the second balanced detector (5), the output end of the first balanced detector (4) is connected with the first input end of the first mixer (6), the output end of the second balanced detector (5) is connected with the first input end of the second mixer (7), the output end of the first mixer (6) and the output end of the second mixer (7) are respectively connected with the first input end and the second input end of the first adder (8), the output end of the first adder (8) is respectively connected with the input end of the power detector (9) and the input end of the signal receiver (10), the output end of the power detector (9) is connected with the input end of the band-pass filter (11), the output end of the band-pass filter (11) is connected with the first input end of the third mixer (13), the output end of the third mixer (13) is connected with the input end of the low-pass filter (15), the output end of the low-pass filter (15) is connected with the input end of the second adder (17), and the first output end and the second output end of the oscillating signal source (16) are respectively connected with the input end of the second phase shifter (14) and the input end of the second phase shifter (14) A second input end of the second adder (17) is connected, an output end of the second phase shifter (14) is connected with a second input end of the third mixer (13), an output end of the second adder (17) is connected with the voltage-controlled oscillator (18), a first output end and a second output end of the voltage-controlled oscillator (18) are respectively connected with a second input end of the first mixer (6) and an input end of the first phase shifter (12), and an output end of the first phase shifter (12) is connected with a second input end of the second mixer (7);
the signal light generated by the signal light source (1) and the local oscillation light generated by the local oscillation laser light source (2) are mixed through the 2 x 490 degree free space optical bridge (3), the 2 x 490 degree free space optical bridge (3) outputs four paths of signals, the phases of which are respectively different by 90 degrees, namely 0 degrees, 90 degrees, 180 degrees and 270 degrees, wherein 0 degrees and 180 degrees are in-phase signals I, and 90 degrees and 270 degrees are quadrature phase signals Q, the I path electric signals are detected by the first balance detector (4), the Q path signals are detected by the second balance detector (5), the electric signals output by the voltage-controlled oscillator (18) and the I path electric signals are subjected to parallel mixing through the first mixer (6), the electric signals output by the voltage-controlled oscillator (18) are subjected to phase shift through the first phase shifter (12) and then are subjected to phase shift and mixing with the Q path signals through the second mixer (7), the signals obtained by the two paths of mixing signals through the first adder (8) are received by the signal receiver (10); meanwhile, the signal passes through the power detector (9) and then is transmitted to the band-pass filter (11) for filtering, the filtered signal and the signal which is sent by the oscillating signal source (16) and is subjected to phase shifting through the second phase shifter (14) are mixed in the third mixer (13), the mixed signal passes through the low-pass filter (15), is added with the signal sent by the oscillating signal source (16) through the second adder (17), and then is fed back to the voltage-controlled oscillator (18), so that the frequency of the output signal of the voltage-controlled oscillator is controlled, and finally phase locking is realized.
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| CN105634591A (en) * | 2016-01-19 | 2016-06-01 | 中国科学院上海光学精密机械研究所 | Free space coherent light communication detection device based on 2*4 90-degree optical bridges |
| CN105721061A (en) * | 2016-01-28 | 2016-06-29 | 中国科学院上海光学精密机械研究所 | Photoelectric hybrid detection device based on 2*4 90-degree optical bridge |
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| CN105634591A (en) * | 2016-01-19 | 2016-06-01 | 中国科学院上海光学精密机械研究所 | Free space coherent light communication detection device based on 2*4 90-degree optical bridges |
| CN105721061A (en) * | 2016-01-28 | 2016-06-29 | 中国科学院上海光学精密机械研究所 | Photoelectric hybrid detection device based on 2*4 90-degree optical bridge |
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