CN211151049U - High-speed driving device for quantum communication high-extinction-ratio narrow-pulse light source - Google Patents
High-speed driving device for quantum communication high-extinction-ratio narrow-pulse light source Download PDFInfo
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- CN211151049U CN211151049U CN202020196962.XU CN202020196962U CN211151049U CN 211151049 U CN211151049 U CN 211151049U CN 202020196962 U CN202020196962 U CN 202020196962U CN 211151049 U CN211151049 U CN 211151049U
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Abstract
The scheme is a high-speed driving device for a quantum communication high-extinction ratio narrow-pulse light source, which comprises the following steps: 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. The advantages are that: a high-speed current source driving chip is 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 utility model relates to a quantum communication field especially relates to a be used for high-speed drive arrangement of narrow pulse light source of quantum communication high extinction ratio.
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, as shown in fig. 1, a laser driving circuit used in the prior art adopts a high-speed current source driving chip and a high-bandwidth microwave triode technology to drive a high-speed narrow-pulse laser, and includes 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 for output, and the current signal controls the switching of the triode Q1 and further controls the switching of a laser diode L D.
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.
SUMMERY OF THE UTILITY MODEL
The utility model provides a be used for high-speed drive method of quantum communication high extinction ratio narrow pulse light source and device for solve among the prior art: 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 in quantum communication, including: 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, the two signal receiving terminals of the high-speed logic chip receive a pulse electrical signal group respectively.
Preferably, the two signal receiving terminals receive the pulse electrical signal group I and the pulse electrical signal group II, respectively, and a delay time between the pulse electrical signal group I and the pulse electrical signal group II is smaller than a pulse width of the pulse electrical signal group I.
Preferably, as to the above technical solution, it is preferable that the resistor R1 is connected in parallel with the capacitor or one end thereof is connected to the circuit node a and the other end thereof is connected to the power supply regulation control module, and the power supply regulation control module includes: one end of the resistor R1 is connected with the first differential signal output end, and the other end is connected with the base electrode of the triode through the circuit node A.
Preferably, as to the above technical solution, it is preferable that the resistor R1 is connected in parallel with the capacitor or one end thereof is connected to the circuit node a and the other end thereof is connected to the power supply regulation control module, and the power supply regulation control module includes: one end of the resistor R1 is connected with the base electrode of the triode through a circuit node A, and the other end is connected with the power supply regulation control module.
Preferably, in the above technical solution, the laser is formed by integrating and 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.
Preferably, the capacitor is used for adjusting the quality of the narrow pulse light signal.
The utility model provides a be used for high-speed drive arrangement of narrow pulse light source of quantum communication high extinction ratio: 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. 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 utility model 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 embodiments or the technical solutions in the prior art, and it is obvious that fig. 2 to 6 in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to 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. 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.
Fig. 6 is a flow chart of the technical solution of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the drawings in the embodiments of the present invention are combined below to clearly and completely describe the technical solutions in the embodiments of the present invention, and obviously, the described embodiments are some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
The technical solution of the present invention is now described by taking a specific embodiment as an example:
fig. 2 is a schematic circuit diagram provided by the first embodiment of the present invention, and fig. 4 and 5 are schematic circuit diagrams of the present invention, which are another two schematic circuit diagrams after the schematic circuit diagram shown in fig. 2 is changed, and are shown in fig. 2, 4 and 5 in combination: a high-speed driving device for a high-extinction-ratio narrow-pulse light source for quantum communication comprises: the high-speed logic chip comprises a high-speed logic chip 1, a capacitor C1, a resistor R1, a resistor R2, a laser 11, a triode Q1 and a power supply regulation control module 12.
A capacitor C1 is provided between the first differential signal output terminal OUT _ P of the high-speed logic chip 1 and the circuit node a. The resistor R1 is connected in parallel with the capacitor C1, or one end of the resistor R1 is connected with the circuit node A, and the other end is connected with the power supply regulation control module 12.
Specifically, one end of the resistor R1 is connected to the first differential signal output terminal OUT _ P, and the other end is connected to the base of the transistor Q1 via the circuit node a, or one end of the resistor R1 is connected to the base of the transistor Q1 via the circuit node a, and the other end is connected to the power output terminal of the power supply regulation control module.
The adjusting output end of the power adjusting control module 12 is connected with the positive electrode of the laser 11, the negative electrode of the laser is connected with the collector of the triode Q1, the base of the triode Q1 is connected with the resistor R2 at the circuit node C, and the emitter of the triode is grounded. And the circuit node C is adjacent to the circuit node A and is positioned on the circuit trunk.
The two signal receiving terminals IN1 and IN2 of the high-speed logic chip 1 are respectively used for receiving the pulse electrical signal group I and the pulse electrical signal group II, and the time delay between the two pulse electrical signal groups is smaller than the pulse width of the pulse electrical signal group I. 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 laser 11 is formed by integrating and packaging a diode 3 and a resistor R, wherein the cathode of the diode 3 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 power supply regulation control module 12 is composed of a DAC circuit, an operational amplifier circuit or a follower circuit. The capacitor C1 is used to adjust the quality of the narrow pulse light signal.
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 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.
Based on the circuit structure shown in fig. 2, in combination with the above, 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; the capacitor C1 has one end connected to the first differential signal output terminal OUT _ P and the other end connected 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.
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 an adjustable resistor, wherein the cathode of the diode is connected with one end of a resistor R, and the other end of the resistor R is connected with a collector electrode through a circuit.
The technical solution of the present invention is now described in detail in conjunction with specific use scenarios, as shown in fig. 6:
and step 101, receiving the pulse electric signal group by the high-speed logic chip.
The pulse electric signal group comprises a pulse electric signal I and a pulse electric signal II, a time delay T is arranged between the two pulse electric signals, and the duration of the time delay T is not more than the pulse width of the pulse electric signal I, which is shown in specific reference to FIG. 3.
And 102, outputting a group of differential signals by the high-speed logic chip.
The high-speed logic chip and the received pulse electrical signal I, II output a set of differential signals, wherein the first differential signal OUT _ P is used for controlling the on and off of the transistor 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: after the voltage division by the circuit, the voltage to the base electrode satisfies step 103And the on condition in step 104.
And 105, adjusting the power supply regulation control module to enable the narrow pulse light signal emitted by the laser to meet the requirements of the QKD system.
Specifically, under the condition that the triode is conducted, the voltage output by the power supply regulation control module is regulated, and when the voltage is increased, the amplitude of the narrow pulse optical signal is increased.
And 106, adjusting the laser to enable the extinction ratio to reach an ideal value.
Specifically, the laser is formed by integrating and combining an adjustable resistor R and a diode, and the adjustable resistor and the diode are integrated in the laser, so that the calculation parameters of a circuit are reduced, the adjustment effect when the extinction ratio is adjusted is improved, and the light emitting rate is improved.
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 utility model provides a be used for high-speed drive arrangement of narrow pulse light source of quantum communication high extinction ratio: 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. 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 utility model has the advantages that: and a high-speed current source driving chip is not needed, so that the circuit cost is saved. 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 adjustable resistor and the diode are integrated in the laser, so that circuit calculation parameters are reduced, and the light emitting rate is improved. Make through regulation voltage size the utility model discloses technical scheme keeps unanimous at the narrow pulse optical signal amplitude that realizes every laser instrument output in the multistage laser instrument scheme. The adjustable resistor 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; although the present invention has been described in detail with reference to the foregoing embodiments, it should 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; such modifications and substitutions do not depart from the spirit and scope of the present invention.
Claims (8)
1. A high-speed driving device of a high-extinction-ratio narrow-pulse light source for quantum communication is characterized by comprising: 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.
2. The high-speed driving device for the quantum communication high-extinction ratio narrow-pulse light source according to claim 1, wherein two signal receiving ends of the high-speed logic chip respectively receive a pulse electric signal set.
3. The high-speed driving device for the high-extinction-ratio narrow-pulse light source for quantum communication according to claim 2, wherein the two signal receiving terminals respectively receive a pulse electrical signal group I and a pulse electrical signal group II, and a time delay between the pulse electrical signal group I and the pulse electrical signal group II is smaller than a pulse width of the pulse electrical signal group I.
4. The high-speed driving device for the quantum communication high-extinction ratio narrow-pulse light source according to claim 1, wherein the resistor R1 is connected in parallel with the capacitor 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, and the driving device comprises:
one end of the resistor R1 is connected with the first differential signal output end, and the other end is connected with the base electrode of the triode through a circuit node A.
5. The high-speed driving device for the quantum communication high-extinction ratio narrow-pulse light source according to claim 1, wherein the resistor R1 is connected in parallel with the capacitor 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, and the driving device comprises:
one end of the resistor R1 is connected with the base electrode of the triode through a circuit node A, and the other end is connected with the power supply regulation control module.
6. The high-speed driving device for the quantum communication high-extinction ratio narrow-pulse light source according to claim 1, wherein the laser is formed by integrating and 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.
7. The high-speed driving device for the quantum communication high-extinction ratio narrow-pulse light source according to claim 6, wherein the power supply regulation control module is composed of a DAC circuit, an operational amplifier circuit or a follower circuit.
8. The high-speed driving device for the quantum communication high-extinction ratio narrow-pulse light source according to claim 1, wherein the capacitor is used for adjusting the quality of the narrow-pulse light signal.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111313226A (en) * | 2020-02-21 | 2020-06-19 | 国开启科量子技术(北京)有限公司 | High-speed driving method and device for quantum communication high-extinction-ratio narrow-pulse light source |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111313226A (en) * | 2020-02-21 | 2020-06-19 | 国开启科量子技术(北京)有限公司 | High-speed driving method and device for quantum communication high-extinction-ratio narrow-pulse light source |
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