CN110635853B - Modulator driving method and system suitable for quantum state random optical signal - Google Patents
Modulator driving method and system suitable for quantum state random optical signal Download PDFInfo
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Abstract
The invention provides a modulator driving method and a system suitable for quantum state random optical signals, wherein the system comprises the following steps: the current source group comprises at least two current sources which are respectively used for outputting adjustable current signals; the power supply source is connected with the input end of each current source and used for supplying power to each current source; the current switch group is connected with the output end of each current source, receives a switch control signal and controls the output of each current source according to the switch control signal to form a driving signal; and the modulator is connected with the current switch group, receives the driving signal and modulates the quantum state random optical signal input into the modulator according to the driving signal. The invention can satisfy the broadband drive of 0Hz (direct current) to 10GHz level, effectively solves the substrate jitter problem of the existing drive circuit, greatly optimizes the signal quality of the drive signal and greatly expands the environmental adaptability of the system.
Description
Technical Field
The invention relates to the technical field of quantum communication, in particular to the technical field of quantum signal driving, and specifically relates to a modulator driving method and system suitable for quantum state random optical signals.
Background
A modulator driving system applicable to a quantum state random optical signal in the prior art scheme is shown in fig. 1, and includes a quantum state random input signal, an ac coupling capacitor, an adjustable gain amplifier, a broadband resistor network, a broadband amplifier, an inductor or Bais _ T, and a modulator.
The AC coupling capacitor functions to pass the AC component of the input signal, but not the DC component; the adjustable gain amplifier has the function of amplifying the received signal, and the gain is adjustable to adjust the voltage value finally output to the modulator; the broadband resistance network has the function of combining and outputting two paths of signals; the function of the broadband amplifier is to amplify the input signal; the inductor or the Bais _ T has the functions of enabling a power supply to supply power to the broadband amplifier and enabling signals not to be shunted towards the power supply; the modulator is controlled to modulate the passing optical signal after receiving the RF signal, and may be a phase modulator or an intensity modulator.
In the field of quantum communication, four levels of pulse signals of 0,1/2,1,3/2 are commonly used for modulating a modulator, in the existing scheme, an adjustable gain amplifier of one channel can be configured to enable the amplitude of an output signal of the adjustable gain amplifier to be half of that of the other channel, and then superposition output is carried out in a rear-end broadband resistor network, so that driving signals of four levels of 0,1/2,1,3/2 can be superposed for driving the modulator after high-speed random optical signals are loaded at two input ends.
The existing scheme adopts a broadband matching design, can meet the requirement of broadband amplification of 100 KHz-10 GHz level, and can control the deterioration amount of signal quality within a certain range and be reluctant to use in a modulator system with lower signal quality requirement due to the fact that low frequency reaches 100KHz compared with a non-broadband matching design. However, in a system with a high signal quality requirement, the error rate of the system is increased and the performance of the system is greatly reduced due to signal quality problems such as substrate jitter and amplitude jitter. Moreover, since the spectral components of the quantum state random optical signal are very wide, the low end is close to 0Hz (i.e. direct current), and the high end is several times of the system frequency, if the signal is amplified without distortion, the driving scheme covers the requirements of the low end and the high end. In practical applications, the high side is easier to implement and the low side is more difficult to implement, and the low side signal is suppressed due to the presence of the ac coupling capacitor and inductor or Bais _ T. And the bandwidth low frequency of the driving circuit is not low enough, which causes signal distortion after random optical signal amplification and signal quality deterioration.
Disclosure of Invention
In view of the above drawbacks of the prior art, an object of the present invention is to provide a method and a system for driving a modulator suitable for a quantum state random optical signal, so as to solve the problems of substrate jitter and poor signal quality caused by insufficient low bandwidth in the conventional modulator driving system suitable for a quantum state random optical signal.
To achieve the above and other related objects, the present invention provides a modulator driving system suitable for a quantum state random optical signal, comprising: the current source group comprises at least two current sources and is used for outputting adjustable current signals; the power supply source is connected with the input end of each current source and used for supplying power to each current source; the current switch group is connected with the output end of each current source, receives a switch control signal and controls the output of each current source according to the switch control signal to form a driving signal; and the modulator is connected with the current switch group, receives the driving signal and modulates the quantum state random optical signal input into the modulator according to the driving signal.
In an embodiment of the invention, the switch control signal is a quantum state random input signal.
In an embodiment of the present invention, a radio frequency port of the modulator is connected to the current switch group, and receives the driving signal from the current switch group; and the modulation amount of the modulator on the quantum state random optical signal is the modulation amount corresponding to the difference value of the voltage of the radio frequency port and the voltage of the signal ground port.
In an embodiment of the invention, the current source set includes two current sources; the amplitude of the output signal of one current source is half of that of the other current source, namely the amplitude of the output signal of one current source is 1, and the amplitude of the output signal of the other current source is 1/2.
In an embodiment of the present invention, the current switch set controls one of the two current sources to be gated and the other to be not gated; or the current switch group controls the two current sources not to be gated; or the current switch group controls the gating of the two current sources; the driving signal is a superposed signal formed by output signals of the two current sources.
In an embodiment of the present invention, the current source set includes three current sources; the output signal amplitudes of the three current sources are respectively 1/2,1 and 3/2.
In an embodiment of the present invention, the current switch set controls one of the three current sources to be gated and the other two current sources to be not gated; or the current switch group controls the three current sources not to be gated.
The embodiment of the present invention further provides a modulator driving method suitable for a quantum state random optical signal, where the modulator driving method suitable for a quantum state random optical signal includes: outputting adjustable current signals through at least two current sources; receiving a switch control signal through a current switch group, and controlling the output of each current source according to the switch control signal to form a driving signal; and the modulator receives the driving signal output by the current switch group and modulates the quantum state random optical signal input into the modulator according to the driving signal.
In an embodiment of the invention, the switch control signal is a quantum state random input signal.
In an embodiment of the present invention, a radio frequency port of the modulator is connected to the current switch group, and receives the driving signal from the current switch group; and the modulation amount of the modulator on the quantum state random optical signal is the modulation amount corresponding to the difference value of the voltage of the radio frequency port and the voltage of the signal ground port.
In an embodiment of the present invention, there are two current sources; the amplitude of the output signal of one current source is half that of the other current source, namely the amplitude of the output signal of one current source is 1, and the amplitude of the output signal of the other current source is 1/2.
In an embodiment of the present invention, the current switch set controls one of the two current sources to be gated and the other to be not gated; or the current switch group controls the two current sources not to be gated; or the current switch group controls the gating of the two current sources; the driving signal is a superposed signal formed by output signals of the two current sources.
In an embodiment of the present invention, the number of the current sources is three; the amplitudes of output signals of the three current sources are respectively 1/2,1 and 3/2.
In an embodiment of the present invention, the current switch set controls one of the three current sources to be gated and the other two current sources to be not gated; or the current switch group controls the three current sources not to be gated.
As described above, the modulator driving method and system suitable for the quantum state random optical signal according to the present invention have the following advantages:
according to the technical scheme, alternating current coupling capacitors and inductors or Bais _ T are not used, direct current matching is realized in all-channel design, broadband driving of more than 0Hz (direct current) and 10GHz can be realized theoretically, broadband driving of 0Hz (direct current) and 10GHz levels can be met (the upper frequency limit of the scheme is not limited theoretically), the problem of substrate jitter of the existing driving circuit is effectively solved, the signal quality of driving signals is greatly optimized, meanwhile, the technical scheme also overcomes the defects that the temperature stability of the broadband amplifier scheme is poor, the output signal amplitude is not easy to compensate along with the temperature change and the like, the environmental adaptability of the system is greatly expanded, the broadband amplifier can be used in a system with high signal quality requirements, and the performance of the system is improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only 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 block diagram of a prior art modulator driving system suitable for quantum state random optical signals.
Fig. 2 shows an overall schematic block diagram of a modulator dynamic system suitable for quantum state random optical signals according to the present invention.
Fig. 3 is a schematic block diagram of an embodiment of a driving system of a modulator suitable for a quantum state random optical signal according to the present invention.
Fig. 4 is a schematic block diagram of another embodiment of the modulator driving system suitable for quantum state random optical signals according to the present invention.
Fig. 5 is a flow chart illustrating a driving method of a modulator suitable for a quantum state random optical signal according to the present invention.
Description of the element reference numerals
100. Modulator driving system suitable for quantum state random optical signal
110. Current source group
1101. Current source
1102. Current source
1103. Current source
110N current source
120. Power supply source
130. Current switch group
140. Modulator
S110 to S130
Detailed Description
The following embodiments of the present invention are provided by way of specific examples, and other advantages and effects of the present invention will be readily apparent to those skilled in the art from the disclosure herein. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict.
Please refer to fig. 2 to 5. It should be understood that the structures, ratios, sizes, etc. shown in the drawings are only used for matching the disclosure of the present disclosure to be understood and read by those skilled in the art, and are not used to limit the conditions of the present disclosure, so that the present disclosure is not limited to the essential meanings in the technology, and any modifications of the structures, changes of the ratio relationships, or adjustments of the sizes, should still fall within the scope of the present disclosure without affecting the functions and the achievable objects of the present disclosure. In addition, the terms "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for clarity of description, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the terms is not to be construed as a scope of the present invention.
The present embodiment aims to provide a method and a system for driving a modulator suitable for a quantum state random optical signal, which are used to solve the problems of substrate jitter and poor signal quality caused by insufficient low bandwidth frequency in the existing modulator driving system suitable for a quantum state random optical signal. The principle and implementation of the method and system for driving a modulator suitable for a quantum state random optical signal according to the present invention will be described in detail below, so that those skilled in the art can understand the method and system for driving a modulator suitable for a quantum state random optical signal without creative labor.
Example 1
As shown in fig. 2, the present invention provides a modulator driving system 100 suitable for quantum state random optical signals, comprising: a current source set 110, a power supply source 120, a current switch set 130 and a modulator 140, wherein, as shown in fig. 2, the current source set 110 includes at least two current sources: the current sources 1101 to 110N, N are positive integers greater than or equal to 2.
The modulator driving system 100 applied to the quantum-state random optical signal of the present embodiment will be described in detail below.
In this embodiment, the power supply 120 is connected to an input end of the current source set 110, and is configured to supply power to the current source set 110, and the current source set 110 is configured to output an adjustable current signal.
The current from the current source 1101 to the current source 110N in the current source set 110 is adjustable, so that parameters can be optimized in a practical circuit. The current source 1101 to the current source 110N may be a voltage-controlled current source or a numerical-control current source, and has the characteristics of flexible design, high temperature stability, convenience for various compensations such as temperature and voltage, high precision, convenience for integration, and the like.
Specifically, in the present embodiment, N =2, as shown in fig. 3, the current source set 110 includes two current sources: current source 1101 and current source 1102.
Wherein the output signal amplitude of the current source 1102 is half of the current source 1101, for example, the output signal amplitude of the current source 1101 is 1, and the output signal amplitude of the other current source 1102 is 1/2, wherein 1 and 1/2 only represent the magnitude relation and not the actual magnitude.
Since the spectral components of the quantum state random optical signal are very wide, the low end is close to 0Hz (i.e. direct current), and the high end is several times of the system frequency, if the signal is amplified without distortion, the driving scheme covers the requirements of the low end and the high end. In practical application, a broadband amplifier is generally used, an ac coupling capacitor and an inductor or Bais _ T generally exist in a scheme, and due to the existence of the ac coupling capacitor and the inductor or Bais _ T, a low-end signal is suppressed, so that a high end of a driving circuit is relatively easy to implement, and a low end of the driving circuit is relatively difficult to implement. And the bandwidth low frequency of the driving circuit is not low enough, which causes signal distortion after random optical signal amplification and signal quality deterioration. In the modulator driving system 100 suitable for the quantum-state random optical signal in this embodiment, ac coupling capacitors and inductors or Bais _ T are not used, dc matching is realized in the full-channel design, and a circuit function is perfectly realized, so that the system can satisfy a broadband driving circuit (the upper frequency limit of the scheme is not limited theoretically) in the order of 0Hz (i.e., dc) to 10GHz or more. Meanwhile, in the modulator driving system 100 suitable for the quantum-state random optical signal of the embodiment, the defects that the broadband amplifier scheme has poor temperature stability, the output signal amplitude is not easily compensated along with temperature change and the like are overcome, and the environmental adaptability of the system is greatly expanded.
Therefore, the modulator driving system 100 suitable for the quantum state random optical signal in this embodiment can satisfy the broadband driving (the upper frequency limit of the scheme is theoretically unlimited) in the order of 0Hz (i.e., direct current) to 10GHz, perfectly solve the problem of substrate jitter of the existing driving circuit, greatly optimize the signal quality of the driving signal, enable the driving signal to be used in a system with higher signal quality requirement, and improve the performance of the system.
In this embodiment, the current switch set 130 is respectively connected to the output terminals of the current source 1101 and the current source 1102, receives an input switch control signal, and controls the output of the current source 1101 and the current source 1102 according to the switch control signal to form the driving signal.
Specifically, in the present embodiment, the switch control signal is a quantum state random input signal. The quantum state random input signal is used as a switch control signal to rapidly switch a current switch, so that the output current can be rapidly switched, the output signals of the current source 1101 and the current source 1102 can be output from an output port, the modulation level required by the modulator 140 is generated on the matching resistor of the modulator 140, and the rate of the quantum state random input signal can theoretically reach more than 100 Gbps.
In this embodiment, the controlling the outputs of the current sources 1101 and 1102 by the current switch set 130 includes: the current switch set 130 controls one of the current source 1101 and the current source 1102 to be gated on, and the other to be not gated; or the current switch group 130 controls neither the current source 1101 nor the current source 1102 to be gated; or the current switch group controls the current source 1101 and the current source 1102 to be both gated; the driving signal is a superimposed signal formed by the output signals of the current source 1101 and the current source 1102.
Specifically, the current switch group 130 functions to implement the following 4 groups of functional combinations by controlling the switch control signal: (1) gating current source 1101, current source 1102 not gated; (2) gating current source 1102, current source 1101 not gating; (3) neither current source 1101 nor current source 1102 is gated; (4) The current source 1101 and the current source 1102 are simultaneously gated so that the two signals can be output from the output port in a superimposed manner.
In this embodiment, the modulator 140 is connected to the current switch set 130, and receives the driving signal output by the current switch set 130 and modulates the quantum state random optical signal input to the modulator 140 according to the driving signal.
Specifically, in the present embodiment, the rf port of the modulator 140 is connected to the current switch set 130, and receives the driving signal from the current switch set 130; the modulation amount of the modulator 140 for the quantum state random optical signal is a modulation amount corresponding to a difference between the voltage of the radio frequency port and the voltage of the signal ground port.
The specific implementation process of the modulator driving system 100 suitable for the quantum-state random optical signal in this embodiment is as follows:
in the field of quantum communication, the modulator 140 is modulated by using four levels of random pulse signals, i.e., 0,1/2,1,3/2, in this embodiment, the current source 1102 channel may be configured to output half of the output current of the current source 1101, so that after a random optical signal is applied to the input terminal as a switching control signal, four levels of driving signals, i.e., 0,1/2,1,3/2, can be superimposed to drive the modulator 140. Wherein 0,1/2,1,3/2 only represents the magnitude relation and not the actual magnitude.
Specifically, for example, the current signal amplitude of the current source 1102 is 1/2, and the current signal amplitude of the current source 1101 is 1. When the current source 1101 and the current source 1102 do not output, the driving signal is a driving signal of 0 level; when the current source 1102 with the signal amplitude of 1/2 outputs and the current source 1101 does not output, the driving signal is a driving signal with the level of 1/2; when the current source 1101 with the signal amplitude of 1 outputs and the current source 1102 does not output, the driving signal is a driving signal with 1 level; when the current source 1101 and the current source 1102 both output, the driving signal is a 3/2 level driving signal formed by superimposing a 1 level and a 1/2 level.
The modulator driving system 100 suitable for the quantum-state random optical signal of the embodiment solves the substrate jitter problem of the existing driving circuit, greatly optimizes the signal quality of the driving signal, enables the driving signal to be used in a system with higher signal quality requirement, and improves the performance of the system.
Example 2
As shown in fig. 2, the present invention provides a modulator driving system 100 suitable for quantum state random optical signals, comprising: a current source set 110, a power supply source 120, a current switch set 130 and a modulator 140, wherein, as shown in fig. 2, the current source set 110 includes at least two current sources: the current sources 1101 to 110N, N are positive integers greater than or equal to 2.
The modulator driving system 100 applied to the quantum-state random optical signal of the present embodiment will be described in detail below.
In this embodiment, the power supply 120 is connected to an input terminal of the current source set 110, and is configured to supply power to the current source set 110, and the current source set 110 is configured to output an adjustable current signal.
The current from the current source 1101 to the current source 110N in the current source set 110 is adjustable, so that the parameters can be optimized in the actual circuit. The current sources 1101 to 110N may be voltage-controlled current sources or numerical-controlled current sources, and have various forms, flexible design, high temperature stability, convenience for various compensations such as temperature and voltage, high precision, convenience for integration, and the like.
Specifically, in the present embodiment, N =3, as shown in fig. 4, the current source set 110 includes three current sources: current source 1101, current source 1102, and current source 1103; the amplitudes of the output signals of the current source 1101, the current source 1102 and the current source 1103 are 1/2,1 and 3/2 respectively, wherein 1/2,1 and 3/2 only represent the magnitude relation and not the actual amplitude.
Since the spectral components of the quantum state random optical signal are very wide, the low end is close to 0Hz (i.e. direct current), and the high end is several times of the system frequency, if the signal is amplified without distortion, the driving scheme covers the requirements of the low end and the high end. In practical application, a broadband amplifier is generally used, an ac coupling capacitor and an inductor or Bais _ T generally exist in a scheme, and due to the existence of the ac coupling capacitor and the inductor or Bais _ T, a low-end signal is suppressed, so that a high end of a driving circuit is relatively easy to implement, and a low end of the driving circuit is relatively difficult to implement. And the bandwidth low frequency of the driving circuit is not low enough, which causes signal distortion after random optical signal amplification and signal quality deterioration. In the modulator driving system 100 suitable for the quantum-state random optical signal in this embodiment, an ac coupling capacitor and an inductor or Bais _ T are not used, and dc matching is realized in all-channel design, so that a circuit function is perfectly realized, and the system can satisfy a broadband driving circuit with a level of 0Hz (i.e., dc) to 10GHz or higher (the upper frequency limit of the scheme is not limited theoretically). Meanwhile, in the modulator driving system 100 applicable to the quantum-state random optical signal in the embodiment, the defects that the broadband amplifier scheme has poor temperature stability, the amplitude of the output signal is not easily compensated along with the temperature change, and the like are overcome, and the environmental adaptability of the system is greatly expanded.
Therefore, the modulator driving system 100 suitable for the quantum state random optical signal in this embodiment can satisfy the broadband driving (the upper frequency limit of the scheme is theoretically unlimited) in the order of 0Hz (i.e., direct current) to 10GHz, perfectly solve the problem of substrate jitter of the existing driving circuit, greatly optimize the signal quality of the driving signal, enable the driving signal to be used in a system with higher signal quality requirement, and improve the performance of the system.
In this embodiment, the current switch set 130 is connected to the output terminals of the current source 1101, the current source 1102 and the current source 1103, receives the input switch control signal, and controls the outputs of the current source 1101, the current source 1102 and the current source 1103 according to the switch control signal to form the driving signal.
Specifically, in this embodiment, the switch control signal is a quantum state random input signal. The quantum state random input signal is used as a switch control signal to rapidly switch a current switch, so that the output current can be rapidly switched, the output signals of the current source 1101, the current source 1102 and the current source 1103 can be output from an output port, the modulation level required by the modulator 140 is generated on the matching resistor of the modulator 140, and the rate of the quantum state random input signal can theoretically reach more than 100 Gbps.
In this embodiment, the controlling the outputs of the current source 1101, the current source 1102 and the current source 1103 by the current switch set 130 includes: the current switch set 130 controls one of the current source 1101, the current source 1102 and the current source 1103 to be gated on, and the other two are not gated on; or none of current source 1101, current source 1102 and current source 1103 are controlled to be gated.
That is, the current switch set 130 functions to realize the following 4 sets of functional combinations by controlling the switch control signal: (1) Gating current source 1101, current source 1102 and current source 1103 ungated; (2) Gated current source 1102, current source 1101 and current source 1103 are not gated; (3) Gating current source 1103, current source 1101, and current source 1102 are not gated; (4) Current source 1101, current source 1102, and current source 1103 are not gated.
In this embodiment, the modulator 140 is connected to the current switch group 130, receives the driving signal output by the current switch group 130, and modulates the quantum state random optical signal input into the modulator 140 according to the driving signal.
Specifically, in the present embodiment, the rf port of the modulator 140 is connected to the current switch set 130, and receives the driving signal from the current switch set 130; the modulation amount of the modulator 140 for the quantum state random optical signal is a modulation amount corresponding to a difference between the voltage of the radio frequency port and the voltage of the signal ground port.
In a quantum communication system, the amplitude jitter value of the driving signal of the modulator 140 is a key index of the system, which directly affects the error rate of the system, and the system performance can be obviously improved by reducing the amplitude jitter value of the driving signal of the modulator 140. Theoretical analysis and experimental tests show that when 1/2 current and 1 current are superposed to generate 3/2 current in example 1, the amplitude jitter of the 3/2 current is further deteriorated on the basis of the 1/2 current and the 1 current, namely, the amplitude jitter of the 1/2 current and the 1 current are superposed while signals are superposed, so that the amplitude jitter of the 3/2 current is larger, and the overall performance of the system is reduced.
In the embodiment, the current source 1101, the current source 1102 and the current source 1103 are used to respectively generate three currents of 1/2,1,3/2, and a current superposition method (signal jitter increases and signal quality deteriorates in the current superposition theory) is not used, so that the signal quality of each path of voltage signal is ensured to be optimal, and meanwhile, the current source 1101, the current source 1102 and the current source 1103 can be in various forms such as a voltage-controlled current source or a numerical control current source, so that the design is flexible, the temperature stability is high, various compensations of temperature, voltage and the like are facilitated, and the current source 1101, the current source 1102 and the current source 1103 have the characteristics of high precision, convenience in integration and the like.
The specific implementation process of the modulator driving system 100 suitable for the quantum-state random optical signal in this embodiment is as follows:
in this embodiment, the current sources 1101, 1102, 1103 output three current signals to generate currents of 1/2,1,3/2 amplitude, respectively. When none of the current source 1101, the current source 1102 and the current source 1103 outputs, the output voltage is 0 level, and one of the three current sources 1101, 1102 and 1103 can generate 1/2,1,3/2 level, so that four driving signals of 0,1/2,1,3/2 level can be generated for driving the modulator 150. Therefore, the embodiment avoids the problem of 3/2 current amplitude jitter deterioration caused when the 1/2 current and the 1 current are superposed to generate the 3/2 current, generates the 3/2 current with better signal quality, greatly optimizes the signal quality of the driving signal and improves the performance of the system.
Example 3
An embodiment of the present invention further provides a method for driving a modulator suitable for a quantum state random optical signal, as shown in fig. 5, the method for driving a modulator suitable for a quantum state random optical signal includes:
step S110, outputting an adjustable current signal through at least two current sources 110;
step S120, receiving a switch control signal through the current switch group 130, and controlling the output of each current source 110 according to the switch control signal to form a driving signal;
in step S130, the modulator 140 receives the driving signal output by the current switch group 130 and outputs the driving signal to the output terminal according to the driving signal
In this embodiment, the switch control signal is a quantum state random input signal.
The method in this embodiment may be implemented by the system of embodiment 1: outputting adjustable current signals through a current source 1101 and a current source 1102; the amplitude of the output signal of one current source is half that of the other current source, for example, the amplitude of the output signal of the current source 1101 is 1, and the amplitude of the output signal of the other current source 1102 is 1/2. Wherein, 1/2,1 only represents the number relationship rather than the actual magnitude, and the implementation principle of the method is the same as that of embodiment 1, and is not repeated herein.
The method in this embodiment can also be implemented by the system of embodiment 2: outputting an adjustable current signal through current source 1101, current source 1102 and current source 1103; the amplitudes of the output signals of the current source 1101, the current source 1102 and the current source 1103 are 1/2,1 and 3/2 respectively. Wherein 1/2,1,3/2 only represent the quantitative relation and not the actual magnitude. The implementation principle of the method is the same as that of embodiment 2, and is not described herein again.
In summary, the technical scheme of the present invention does not use ac coupling capacitors and inductors or Bais _ T, dc matching is achieved in all channel designs, wideband driving at 0Hz (i.e. dc) to 10GHz or more can be achieved theoretically, wideband driving at 0Hz (i.e. dc) to 10GHz level can be satisfied (the upper frequency limit of the present scheme is not limited theoretically), the problem of substrate jitter of the existing driving circuit is effectively solved, and the signal quality of the driving signal is greatly optimized. Therefore, the invention effectively overcomes various defects in the prior art and has high industrial utilization value.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Those skilled in the art can modify or change the above-described embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention shall be covered by the claims of the present invention.
Claims (12)
1. A modulator driver system adapted for use with a quantum state random optical signal, comprising:
the current source group comprises at least two current sources and is used for outputting adjustable current signals;
the power supply source is connected with the input end of each current source and used for supplying power to each current source;
the current switch group is connected with the output end of each current source, receives a switch control signal and controls the output of each current source according to the switch control signal to form a driving signal;
the modulator is connected with the current switch group, receives the driving signal and modulates the quantum state random optical signal input into the modulator according to the driving signal;
the switch control signal is a quantum state random input signal.
2. The modulator driving system according to claim 1, wherein a radio frequency port of the modulator is connected to the current switch set, and receives the driving signal from the current switch set; and the modulation amount of the modulator on the quantum state random optical signal is the modulation amount corresponding to the difference value of the voltage of the radio frequency port and the voltage of the signal ground port.
3. The modulator driving system according to claim 1, wherein the current source set comprises two current sources; the amplitude of the output signal of one current source is half of that of the other current source, namely the amplitude of the output signal of one current source is 1, and the amplitude of the output signal of the other current source is 1/2.
4. The modulator driving system according to claim 3, wherein said current switch set controls one of two current sources to be gated and the other to be not gated; or the current switch group controls the two current sources not to be gated; or the current switch group controls the gating of the two current sources; the driving signal is a superposed signal formed by output signals of the two current sources.
5. The modulator driving system according to claim 1, wherein the set of current sources comprises three current sources; the amplitudes of output signals of the three current sources are respectively 1/2,1 and 3/2.
6. The modulator driving system according to claim 5, wherein the current switch group controls one of three current sources to be gated and the other two to be not gated; or the current switch group controls the three current sources not to be gated.
7. A method for driving a modulator suitable for a quantum state random optical signal, the method comprising:
outputting adjustable current signals through at least two current sources;
receiving a switch control signal through a current switch group, and controlling the output of each current source according to the switch control signal to form a driving signal;
the modulator receives the driving signal output by the current switch group and modulates the quantum state random optical signal input into the modulator according to the driving signal;
the switch control signal is a quantum state random input signal.
8. The method according to claim 7, wherein the modulator has a radio frequency port connected to the current switch group, and receives the driving signal from the current switch group; and the modulation amount of the modulator on the quantum state random optical signal is the modulation amount corresponding to the difference value of the voltage of the radio frequency port and the voltage of the signal ground port.
9. The method of claim 7, wherein there are two current sources; the amplitude of the output signal of one current source is half of that of the other current source, namely the amplitude of the output signal of one current source is 1, and the amplitude of the output signal of the other current source is 1/2.
10. The modulator driving method for quantum state random optical signals according to claim 9, wherein the current switch group controls one of the two current sources to be gated and the other to be not gated; or the current switch group controls the two current sources not to be gated; or the current switch group controls the gating of the two current sources; the driving signal is a superposed signal formed by output signals of the two current sources.
11. The method of claim 7, wherein the number of current sources is three; the amplitudes of output signals of the three current sources are respectively 1/2,1 and 3/2.
12. The method of claim 11, wherein the current switch sets control one of the three current sources to be gated and the other two to be gated; or the current switch group controls the three current sources not to be gated.
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