CN111313226A - High-speed driving method and device for quantum communication high-extinction-ratio narrow-pulse light source - Google Patents
High-speed driving method and device for quantum communication high-extinction-ratio narrow-pulse light source Download PDFInfo
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- CN111313226A CN111313226A CN202010107754.2A CN202010107754A CN111313226A CN 111313226 A CN111313226 A CN 111313226A CN 202010107754 A CN202010107754 A CN 202010107754A CN 111313226 A CN111313226 A CN 111313226A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/04—Processes or apparatus for excitation, e.g. pumping, e.g. by electron beams
- H01S5/042—Electrical excitation ; Circuits therefor
- H01S5/0428—Electrical excitation ; Circuits therefor for applying pulses to the laser
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/04—Processes or apparatus for excitation, e.g. pumping, e.g. by electron beams
- H01S5/042—Electrical excitation ; Circuits therefor
- H01S5/0427—Electrical excitation ; Circuits therefor for applying modulation to the laser
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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
- H04B10/70—Photonic quantum communication
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Abstract
The scheme is a high-speed driving method and a high-speed driving device for a quantum communication high-extinction ratio narrow-pulse light source, and the method comprises the following steps: the high-speed logic chip receives a group of pulse electric signals and then outputs a group of differential signals, and a first differential signal high-level triode of the high-speed logic chip is conducted, so that the laser outputs narrow pulse optical signals with the adjusted extinction ratio. The quality of the narrow pulse optical signals is adjusted by adjusting the capacitance between the high-speed logic chip and the circuit node A, and the power supply adjustment control module is adjusted to achieve the purpose of adjusting the quality of the output narrow pulse optical signals. The advantages are that: a driving circuit of a narrow pulse electric signal and a high-speed current source driving chip are not needed, so that the circuit cost is saved; a group of pulse electric signals with time delay are used as an input source to enable the input signals to be stable and controllable; the resistor R and the diode are integrated in the laser, circuit calculation parameters are reduced, and the light emitting rate is improved; the narrow pulse light signals output by each laser in the multi-stage laser scheme are consistent in amplitude by adjusting the voltage.
Description
Technical Field
The invention relates to the field of quantum communication, in particular to a high-speed driving method and device for a high-extinction-ratio narrow-pulse light source for quantum communication.
Background
Semiconductor lasers play a crucial role in quantum communication systems as core components of single photon sources.
The driving circuit of the semiconductor laser currently applied in the field of quantum communication is mostly realized in the following two ways, and a plurality of circuit devices are connected to form the driving circuit or an integrated chip is used as the driving circuit.
For example, a laser driving circuit used in the prior art, as shown in fig. 1, uses a high-speed current source driving chip and a high-bandwidth microwave triode technology to realize the driving of a high-speed narrow-pulse laser. The laser diode driving circuit comprises a high-speed current source driving chip and a triode Q1, wherein the high-speed current source driving chip converts an externally input narrow pulse voltage signal into a corresponding narrow pulse current signal to be output, and the current signal controls the switch of the triode Q1 so as to control the switch of a laser diode LD. In a specific implementation process, the VB voltage Is regulated by regulating the current direction of the Is, when VB Is greater than VT, the triode Q1 Is conducted to output a narrow pulse light signal, and the pulse light intensity of the laser can be further regulated by controlling the magnitude of the current ILD through R3; q1 turns off no laser pulse output when VB < VT. Where VT is the turn-on voltage of transistor Q1.
The high-speed narrow-pulse driving of the quantum communication single-photon source laser can be completed through the process, the extinction ratio can be adjusted through R3, and the quantum communication single-photon source laser has good application in the existing quantum communication system.
The high-speed driving module of the laser of the quantum communication single photon source also has certain defects:
1. the input end of the high-speed current driving chip must be a narrow pulse driving signal, the driving module cannot realize the narrow pulse generating function, and a narrow pulse generating circuit needs to be additionally arranged.
2. Although the purpose of adjusting the extinction ratio is achieved by adjusting the resistor R3, in the actual circuit implementation process, the relevant hardware circuit needs to be changed, and in practice, it cannot be guaranteed that the circuit consistency can be maintained when the hardware circuit is changed, and if the circuit consistency is maintained, it cannot be guaranteed that the extinction ratio is not adjusted in practice.
3. The external resistor R3 generates certain parasitic parameters in the drive chain of the laser, which affects the drive rate.
Moreover, due to device variability of circuit devices (different R3 of each circuit), in the multi-stage laser driving scheme, the amplitude of the narrow pulse light signal emitted by each laser is different due to the voltage difference of Vce of different lasers.
Therefore, how to provide a pulse light source driving method with low cost, high speed and high extinction ratio, and with adjustable narrow pulse signal light amplitude in a multi-laser QKD system, becomes a problem to be solved urgently.
Disclosure of Invention
The invention provides a high-speed driving method and a high-speed driving device for a high-extinction-ratio narrow-pulse light source for quantum communication, which are used for solving the problems in the prior art that: the narrow pulse voltage signal is converted into a corresponding narrow pulse current signal by arranging a narrow pulse generating circuit and a high-speed current source driving chip, so that the cost is high; still be used for solving among the prior art: in the process of adjusting the extinction ratio by adjusting the resistor, the problems of large circuit calculation amount and low light emitting rate caused by incapability of keeping circuit consistency and parasitic parameters generated by the adjusting resistor in a driving link are further solved, and the problem of unstable amplitude of the finally output narrow pulse light signal caused by different amplitudes of the narrow pulse light signals emitted by the lasers due to the difference of Vce voltages among different lasers in the multi-stage laser driving scheme is further solved.
In order to achieve the above object, the present invention provides a high-speed driving method for a high-extinction-ratio narrow-pulse light source used in quantum communication, including: the high-speed logic chip receives the pulse electric signal group I and the pulse electric signal group II and outputs a group of differential signals after operation, the triode is conducted when the first differential signal in the group of differential signals is at a high level, then the laser is conducted, and the adjusting power supply adjusting control module adjusts the extinction ratio of the output narrow pulse optical signal.
Preferably, as a preferred feature of the above technical solution, a delay time is provided between the pulse electrical signal group I and the pulse electrical signal group II, and the delay time is smaller than a pulse width of the pulse electrical signal group I.
Preferably, in the above aspect, V is set to be high when the first differential signal is highout_pAnd VB is higher than Vt, and the triode is conducted. When the first differential signal is low, Vout_pAnd the voltage is low level, VB is less than Vt, and the triode is turned off. Vout _ p is constantly greater than Vt, which is the transistor turn-on voltage.
Preferably, as a preferred mode of the above-mentioned solution, a resistor R1 is provided between the high-speed logic chip and the circuit node a, a resistor R2 is provided between the circuit node D and the emitter of the transistor, a voltage VB is a voltage between the circuit node a and the circuit node D, and VB ═ R2/(R1+ R2)]×Vout_p。
Preferably, as a preferred feature of the above technical solution, a capacitor is disposed between the high-speed logic chip and the circuit node a for adjusting the quality of the narrow-pulse optical signal.
Preferably, as a preferred aspect of the above technical solution, the positive electrode of the laser is connected to the power supply regulation control module.
Preferably, the laser is formed by integrally combining a resistor R and a diode.
The technical scheme of the invention also provides a high-speed driving device for the quantum communication high-extinction ratio narrow-pulse light source, which can realize the method and comprises the following steps: the high-speed logic chip, electric capacity, resistance R1, resistance R2, laser instrument, triode, power regulation control module. A capacitor is arranged between the first differential signal output end of the high-speed logic chip and the circuit node A, and the resistor R1 is connected with the capacitor in parallel or one end of the resistor R1 is connected with the circuit node A and the other end of the resistor R1 is connected with the power supply regulation control module. The adjusting output end of the power adjusting control module is connected with the positive electrode of the laser, the negative electrode of the laser is connected with the collector electrode of the triode, the base electrode of the triode is connected with the resistor R2 at the circuit node C, and the emitting electrode of the triode is grounded. Circuit node C is adjacent to circuit node a and is located on the circuit trunk.
Preferably, in the above technical solution, the laser is formed by packaging a diode and a resistor R, a cathode of the diode is connected to one end of the resistor R, and the other end of the resistor R is connected to the collector via a circuit.
Preferably, as a preferred option of the above technical solution, the power supply regulation control module is composed of a DAC circuit, an operational amplifier circuit or a follower circuit.
The technical scheme of the invention provides a high-speed driving method and a high-speed driving device for a quantum communication high-extinction ratio narrow-pulse light source, wherein the method comprises the following steps: the high-speed logic chip receives the group of pulse electric signals and then outputs a group of differential signals, a triode is conducted when a first differential signal in the group of differential signals is at a high level, and a narrow pulse optical signal with an adjusted extinction ratio is output after a laser is further conducted. The quality of the narrow pulse optical signal is adjusted through the capacitor between the first differential signal output end of the high-speed logic chip and the circuit node A, and the power supply adjusting control module connected with the anode of the laser is adjusted to achieve the purpose of adjusting the quality of the output narrow pulse optical signal.
The invention has the advantages that:
1. and a high-speed current source driving chip is not needed, so that the circuit cost is saved.
2. The voltage at the input end and the narrow pulse electric signal in the prior art are replaced by a group of pulse electric signals with time delay, so that the input source is more stable and controllable.
3. The resistor R and the diode are integrated in the laser, so that circuit calculation parameters are reduced, and the light emitting rate is improved.
4. The technical scheme of the invention keeps the amplitude of the narrow pulse optical signal output by each laser in the scheme of realizing the multistage laser to be consistent by adjusting the voltage.
5. The resistor R and the diode are integrated in the laser, so that the interference among circuit devices is reduced, and the adjustment effect of the extinction ratio is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, a brief description will be given below of the drawings required for the description of the embodiments or the prior art, and it is obvious that fig. 2 to 5 in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic circuit diagram of the prior art.
Fig. 2 is a circuit diagram according to a first embodiment of the present invention.
Fig. 2a is a flow chart of the technical solution of the present invention.
FIG. 3 is a timing diagram of a pulse circuit according to an embodiment of the present invention.
Fig. 4 is a circuit diagram according to another embodiment of the present invention.
Fig. 5 is a circuit diagram according to still another embodiment of the invention.
The laser 11, the adjusting power supply adjusting control module 12.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
Fig. 2a is a flowchart illustrating a technical solution of the present invention, fig. 2 is a circuit diagram provided by a first embodiment of the present invention, fig. 3 is a timing diagram of a pulse circuit according to an embodiment of the present invention, and fig. 2 and fig. 3 are combined to show:
in step 101, the high-speed logic chip receives the set of pulsed electrical signals I, II.
There is a time delay T between two pulse electrical signal groups, and the duration of the time delay T is not greater than the pulse width of the pulse electrical signal group I, as shown in fig. 3.
And 102, outputting a group of differential signals by the high-speed logic chip.
The high-speed logic chip outputs a set of differential signals after performing and operation on the received pulse electrical signal set I, II, wherein the first differential signal OUT _ P is used for controlling the on and off of a triode in the circuit.
And 103, when OUT _ P is at a low level, VB is less than Vt, and the triode is turned off.
OUT _ P is low, Vout_pIs also in the low level position, at which time Vout_pVB ═ R2/(R1+ R2) after voltage division by resistors R1 and R2]×Vout_p< Vt, the transistor is off, Vt is the transistor turn-on voltage.
And 104, when OUT _ P is at high level, VB is more than Vt, and the triode is conducted.
As shown in fig. 2, a resistor R1 is provided between the high-speed logic chip and the circuit node a, a resistor R2 is provided between the circuit node D and the emitter of the transistor, and the circuit node D is electrically connected to the base of the transistor.
Specifically, OUT _ P is high, Vout_pIs also in the high level position, Vout_pVB is obtained after voltage division by the resistors R1 and R2: VB ═ R2/(R1+ R2)]×Vout_p；
Wherein, as shown in FIG. 3, Vout_pIs constantly greater than Vt, Vout_pSatisfies the following conditions: the voltage to the base after circuit division meets the turn-off condition of step 103 and the turn-on condition of step 104.
And 105, adjusting the power supply adjustment control module to enable the extinction ratio of the narrow pulse optical signal to reach an ideal value.
When the voltage emitted by the power supply regulation control module is adjusted to be increased, the ILD in the circuit is increased, and the extinction ratio is increased along with the increase of the ILD. Specifically, under the condition that the triode is conducted, the voltage output by the power supply regulation control module is regulated, so that the narrow pulse optical signal emitted by the laser meets the requirements of a QKD system, and the amplitude of the narrow pulse optical signal is increased when the voltage is increased.
Specifically, the laser is formed by integrating and combining a resistor R and a diode, and the resistor R and the diode are integrated in the laser, so that the circuit calculation parameters are reduced, the adjustment effect when the extinction ratio is adjusted is improved, and the light emitting rate is improved. Furthermore, the size of the resistor R in the laser can be flexibly changed on the premise of meeting the technical scheme.
Further, the capacitor in the circuit is used for adjusting the quality of the narrow pulse optical signal, and when the capacitance value is reduced, the signal quality of the narrow pulse optical signal is improved.
In the above embodiments, the power supply regulation control module shown in fig. 2, 4 and 5 may be a fixed VCC power supply, or an adjustable power supply having a DAC control interface and a DAC control circuit and an operational amplifier circuit or a follower circuit. Fig. 4 and fig. 5 show two different circuit connection ways for implementing the implementation schemes of steps 101-106.
The present application further provides a high-speed driving apparatus for a high-extinction-ratio narrow-pulse light source in quantum communication, as shown in fig. 2, 4 and 5, including: the high-speed logic chip, electric capacity, resistance R1, resistance R2, laser instrument, triode, power regulation control module.
As shown in fig. 2, a resistor R1 is connected between the first differential signal output terminal OUT _ P of the high-speed logic chip and the circuit node a, and a capacitor C1 and a resistor R1 are connected in parallel to the circuit node a.
The circuit node C is connected with the base electrode of the triode and one end of the resistor R2, and the other end of the resistor R2 and the emitting electrode of the triode are grounded. The collector of triode is connected with the negative pole of laser instrument, and the laser instrument positive pole is connected with power VCC.
Based on the circuit configuration shown in fig. 2, as shown in fig. 4: the positive pole of the laser is connected with the power output end of the power supply regulation control module. The power supply regulation control module is formed by sequentially connecting a DAC circuit, an operational amplifier circuit or a following circuit.
Based on the circuit configuration shown in fig. 2, as shown in fig. 5: one end of the resistor R1 is connected with the circuit node A, and the other end is directly connected with a power supply VCC; one end of the capacitor C1 is connected to the first differential signal output terminal OUT _ P and the other end is connected to the circuit node A when V is greater than Vout_pAt a high level position, Vout_pAfter voltage division by resistors R1 and R2, VB ═ I2 ═ R2 > Vt, Vout_pAt low level position VB<Vt, transistor Q1 is in an off state.
Based on the scheme, one end of the resistor R1 is connected with the circuit node A, and the other end of the resistor R1 is connected with the power supply regulation control module.
In the circuit configurations shown in fig. 2, 4, 5: the circuit node A is adjacent to the circuit node C, and both the circuit node A and the circuit node C are positioned on the circuit trunk, and a passage is formed between the two nodes; the laser is formed by packaging a diode and a resistor R, the cathode of the diode is connected with one end of the resistor R, and the other end of the resistor R is connected with a collector electrode through a circuit. The magnitude of the resistance R in the laser may vary.
The technical scheme of the invention provides a high-speed driving method and a high-speed driving device for a quantum communication high-extinction ratio narrow-pulse light source, wherein the method comprises the following steps: the high-speed logic chip receives the group of pulse electric signals and then outputs a group of differential signals, a triode is conducted when a first differential signal in the group of differential signals is at a high level, and a narrow pulse optical signal with an adjusted extinction ratio is output after a laser is further conducted. The quality of the narrow pulse optical signal is adjusted through the capacitor between the first differential signal output end of the high-speed logic chip and the circuit node A, and the power supply adjusting control module connected with the anode of the laser is adjusted to achieve the purpose of adjusting the quality of the output narrow pulse optical signal.
The invention has the advantages that: the circuit cost is saved without a high-speed current source driving chip. The voltage at the input end and the narrow pulse electric signal in the prior art are replaced by a group of pulse electric signals with time delay, so that the input source is more stable and controllable. The resistor R and the diode are integrated in the laser, so that circuit calculation parameters are reduced, and the light emitting rate is improved. The technical scheme of the invention keeps the amplitude of the narrow pulse optical signal output by each laser in the scheme of realizing the multistage laser to be consistent by adjusting the voltage. The resistor R and the diode are integrated in the laser, so that the interference among circuit devices is reduced, and the adjustment effect of the extinction ratio is improved.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A high-speed driving method of a high-extinction-ratio narrow-pulse light source for quantum communication is characterized by comprising the following steps:
the high-speed logic chip receives the pulse electric signal group I and the pulse electric signal group II and outputs a group of differential signals after operation, the triode is conducted when the first differential signal in the group of differential signals is at a high level, then the laser is conducted, and the adjusting power supply adjusting control module adjusts the extinction ratio of the output narrow pulse optical signal.
2. The high-speed driving method for the quantum communication high-extinction ratio narrow-pulse light source according to claim 1, wherein the method comprises:
and a time delay is arranged between the pulse electric signal group I and the pulse electric signal group II, and the time delay is smaller than the pulse width of the pulse electric signal group I.
3. The high-speed driving method for the quantum communication high-extinction ratio narrow-pulse light source according to claim 1, wherein the method comprises:
when the first differential signal is at a high level, Vout_pThe voltage is high level, VB is more than Vt, and the triode is conducted;
when the first differential signal is at a low level, Vout_pThe voltage is low level, VB is less than Vt, and the triode is turned off;
wherein said Vout_pAnd the voltage is constantly greater than Vt, and the Vt is the conduction voltage of the triode.
4. The method according to claim 3, wherein a resistor R1 is provided between the high speed logic chip and the circuit node A, a resistor R2 is provided between the circuit node D and the emitter of the triode, and the voltage VB is the voltage between the circuit node A and the circuit node D [ R2/(R1+ R2) ]]×Vout_p。
5. The high-speed driving method of the narrow-pulse light source with high extinction ratio for quantum communication according to claims 1, 2, 3 and 4, wherein a capacitor is arranged between the high-speed logic chip and a circuit node A for adjusting the quality of the narrow-pulse light signal.
6. The high-speed driving method for the quantum communication high-extinction ratio narrow-pulse light source according to claim 5, wherein a positive electrode of the laser is connected with the power supply regulation control module.
7. The high-speed driving method for the quantum communication high-extinction ratio narrow-pulse light source according to claim 6, wherein the laser is formed by integrally combining a resistor R and a diode.
8. A high-speed driving device for a high extinction ratio narrow-pulse light source for quantum communication, which can realize the method as claimed in any one of claims 1 to 7, characterized in that it comprises: a high-speed logic chip, a capacitor, a resistor R1, a resistor R2, a laser, a triode, a power supply regulation control module,
the capacitor is arranged between the first differential signal output end of the high-speed logic chip and a circuit node A, and the resistor R1 is connected with the capacitor in parallel or one end of the resistor R1 is connected with the circuit node A and the other end of the resistor R1 is connected with the power supply regulation control module;
the adjusting output end of the power adjusting control module is connected with the positive electrode of the laser, the negative electrode of the laser is connected with the collector electrode of the triode, the base electrode of the triode is connected with the resistor R2 at a circuit node C, and the emitter electrode of the triode is grounded;
and the circuit node C is adjacent to the circuit node A and is positioned on the circuit trunk.
9. The high-speed driving device for the quantum communication high-extinction ratio narrow-pulse light source according to claim 8, wherein the laser is formed by packaging a diode and a resistor R, a cathode of the diode is connected with one end of the resistor R, and the other end of the resistor R is connected with the collector through a circuit.
10. The high-speed driving device for the quantum communication high-extinction ratio narrow-pulse light source according to claim 9, wherein the power supply regulation control module is composed of a DAC circuit, an operational amplifier circuit or a follower circuit.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112965181A (en) * | 2021-02-22 | 2021-06-15 | 哈尔滨工业大学（深圳） | Large-scale integrated photonic device array control circuit and method |
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| CN111313226B (en) | 2021-12-03 |
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Inventor after: Chen Liuping Inventor after: Wang Qibing Inventor after: Wan Xiangkui Inventor after: Lao Weilun Inventor before: Chen Liuping Inventor before: Wang Qibing Inventor before: Wan Xiangkui |
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