CN218006253U

CN218006253U - Laser driving device

Info

Publication number: CN218006253U
Application number: CN202222739549.5U
Authority: CN
Inventors: 张国峰; 王林松; 王其兵
Original assignee: Guokaike Quantum Technology Beijing Co Ltd
Current assignee: Guokaike Quantum Technology Beijing Co Ltd
Priority date: 2022-10-18
Filing date: 2022-10-18
Publication date: 2022-12-09
Anticipated expiration: 2032-10-18

Abstract

The utility model discloses a laser driving device relates to optical element technical field, including analog to digital converter, clock/data fan-out buffer, delay timer, treater and low phase noise amplifier, wherein, analog to digital converter is used for receiving the drive signal that the controller sent and converts drive signal into digital signal by analog signal; the clock/data fan-out buffer is electrically connected with the analog-to-digital converter and is used for receiving the digital signals sent by the analog-to-digital converter and dividing the digital signals into 2 paths; the delayer is electrically connected with the clock/data fan-out buffer and is used for respectively carrying out delay processing on the 2 paths of digital signals so as to output the 2 paths of digital signals at different time points; the processor is electrically connected with the delayer and used for carrying out NAND operation on the 2 paths of digital signals input by the delayer to obtain a narrow pulse driving signal, and phase noise is reduced under the condition that the driving signal with the pulse width less than 100 picoseconds can be obtained.

Description

Laser driving device

Technical Field

The utility model relates to an optical element technical field, concretely relates to laser instrument drive arrangement.

Background

The performance of the key device is an important factor for determining the quality of the quantum communication system, and the single photon source is one of the key devices of the quantum communication system. The preparation of an ideal single photon source requires high conditions and cost, so that the single photon source is not industrialized. In engineering, a weak coherent light source which attenuates pulse laser light to a single photon level is generally used as a quasi-single photon source of a quantum communication system. The scheme has requirements on parameter indexes such as wavelength stability, wavelength precision, power stability, pulse width and the like of the pulse laser.

In a quantum secure communication system, an avalanche photodiode working in a geiger mode is commonly used to realize the detection of a single photon. In order to inhibit dark counting and back pulse, the effective detection time of the single photon detector is extremely short, the effective detection gate width of the single photon detector with the working frequency in the MHz level is generally less than 1 nanosecond, and the effective detection gate width of the high-speed single photon detector with the working frequency in the GHz level is shorter and is only about 100 picoseconds. Therefore, the pulse width of the pulsed laser light emitted by a quasi-single photon source must be sufficiently narrow to ensure that a single photon is effectively detected by a single photon detector. Firstly, if the pulse width of the pulse laser is larger than the effective detection gate width of the single-photon detector, the time sequence symmetry of the single-photon detector is seriously influenced, so that the mismatching of the detection efficiency between the two single-photon detectors is aggravated, and the safety of a quantum communication system is further reduced. The pulse width of the pulsed laser must be less than 100 picoseconds. Moreover, the equivalent bandwidth of the pulse laser with the pulse width of 100ps is larger than 12GHz, the corresponding wavelength is 2.5cm, the equivalent bandwidth is compared with the size of a circuit board and the routing length, the lumped circuit analysis method is not applicable, time jitter exists, and the bit error rate of the quantum communication system is directly influenced.

The patent document with the publication number of CN 203416270U discloses a weak coherent single photon source generating device for a gigahertz quantum secret communication system, which adopts band-pass filtering to amplify a clock signal to generate a high-speed sine signal of a 'sharp top', then generates a pulse signal through a high-speed comparator, and amplifies the power of the pulse signal to drive a laser, the scheme has higher requirement on a band-pass filter, the jitter of pulse width can be influenced by in-band fluctuation, and the power of the generated laser pulse is unstable; patent document CN101895058A discloses a high-speed narrow-pulse modulation driving power supply for semiconductor laser, which uses high-speed mosfet as switch, and changes the power supply voltage, resistance and capacitance in the driving power supply circuit to make the driven laser output the required laser pulse, and this scheme is affected by the parasitic parameters of resistance and capacitance, and it is difficult to generate laser pulse with pulse width less than 100 picoseconds; patent document CN106654851A discloses a narrow pulse driving circuit for semiconductor laser and its working method, the scheme disclosed in this patent document is simple and feasible, but only can generate laser pulse signal with the narrowest pulse width of 538ps, and the requirement that the pulse width is less than 100 picoseconds cannot be met, so the practical value is not great. At present, an arithmetic unit participates in operation to obtain laser pulse with the pulse width of less than 100 picoseconds, and a triode with the model of BFP650 is adopted to amplify the power of a laser pulse signal so as to drive a laser, but the triode is a common triode, has large phase noise (jitter of not less than 100 picoseconds) and is not suitable for a quantum communication system with strict requirements.

SUMMERY OF THE UTILITY MODEL

In order to solve the above problem, an embodiment of the present invention provides a laser driving device. The embodiment of the utility model provides a laser instrument drive arrangement includes:

and the analog-to-digital converter is used for receiving the driving signal sent by the controller and converting the driving signal from an analog signal to a digital signal.

And the clock/data fan-out buffer is electrically connected with the analog-to-digital converter and is used for receiving the digital signal sent by the analog-to-digital converter and dividing the digital signal into 2 paths.

And the delayer is electrically connected with the clock/data fan-out buffer and is used for respectively carrying out delay processing on the 2 paths of digital signals, so that the 2 paths of digital signals are output at different time points, and delay exists between the 2 paths of digital signals.

And the processor is electrically connected with the delayer and is used for performing NAND operation on the 2 paths of digital signals input by the delayer to obtain a narrow pulse driving signal.

And the low-phase noise amplifier is electrically connected with the processor and is used for amplifying the peak voltage of the narrow-pulse driving signal input by the processor so as to drive the laser.

Preferably, the analog-to-digital converter is a high-speed comparator.

Preferably, the clock/data fan-out buffer has a model number NB7L11M.

Preferably, the model of the low-phase noise amplifier is HMC460LC5.

Preferably, the processor is model NBSG86A.

Preferably, the model of the delayer is NB6L295MMNG.

The embodiment of the utility model provides a laser driving device has following beneficial effect:

by adopting the NBSG86A processor and the low-phase noise amplifier with the model of HMC460LC5, under the condition of ensuring that the driving signal with the pulse width less than 100 picoseconds can be obtained, the phase noise is reduced (the jitter is less than 100 picoseconds), and the method can be applied to a quantum communication system with strict requirements.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings 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 structural diagram of a laser driving apparatus provided in an embodiment of the present invention.

Fig. 2 is a schematic diagram of laser pulse signals output by each device of the laser driving apparatus provided by the embodiment of the present invention.

Detailed Description

In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the attached drawings in the embodiments of the present invention are combined to clearly and completely describe the technical solution in the embodiments of the present invention, and obviously, the described embodiments are part of the embodiments of the present invention, rather than 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.

As shown in fig. 1, the embodiment of the present invention provides a laser driving apparatus, which includes an analog-to-digital converter, a clock/data fan-out buffer, a delay, a processor, and a low phase noise amplifier, wherein:

the analog-to-digital converter is used for receiving the driving signal sent by the controller and converting the driving signal from an analog signal to a digital signal.

Specifically, the controller is an FPGA, the driving signal sent by the FPGA is a TTL level signal, the TTL level signal is converted by an analog-to-digital converter to form a CML signal, and the CML signal is a current-type high-speed level signal.

In one example, the analog-to-digital converter is a high-speed comparator.

Specifically, the model of the high speed comparator is ADCMP572.

The clock/data fan-out buffer is electrically connected with the analog-to-digital converter and is used for receiving the digital signals sent by the analog-to-digital converter and dividing the digital signals into 2 paths.

In one example, the clock/data fan-out buffer is model NB7L11M.

The delayer is electrically connected with the clock/data fan-out buffer and is used for respectively carrying out delay processing on the 2 paths of digital signals, so that the 2 paths of digital signals are output at different time points, and delay exists between the 2 paths of digital signals.

As shown in fig. 2, by adjusting the time delay between the 2 digital signals, a laser pulse signal with a set pulse width can be obtained.

In one example, the model number of the delayer is NB6L295MMNG.

The processor is electrically connected with the delayer and used for carrying out NAND operation on the 2 paths of digital signals input by the delayer to obtain a narrow pulse driving signal (the pulse width is less than 100 picoseconds).

In one example, the processor is model NBSG86A.

Specifically, a narrow pulse driving signal with a pulse width of less than 100 picoseconds can be obtained by performing nand operation on 2 paths of digital signals input by the delayer.

The low phase noise amplifier is electrically connected with the processor and used for amplifying the peak voltage of the narrow pulse driving signal input by the processor so as to drive the laser.

In one example, the low phase noise amplifier is model HMC460LC5.

Specifically, due to the adoption of the low-phase noise amplifier with the model of HMC460LC5, the obtained narrow-pulse driving signal has small phase noise, namely small jitter, and can be applied to a quantum communication system with strict requirements.

It will be appreciated that the relevant features of the method and apparatus described above are referred to one another. In addition, "first", "second", and the like in the above embodiments are for distinguishing the embodiments, and do not represent merits of the embodiments.

The above are merely examples of the present application and are not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement or the like made within the spirit and principle of the present application shall be included in the scope of the claims of the present application.

It should be noted that the above-mentioned embodiments do not limit the present invention in any way, and all technical solutions obtained by adopting equivalent replacement or equivalent transformation fall within the protection scope of the present invention.

Claims

1. A laser driving apparatus, comprising:

the analog-to-digital converter is used for receiving the driving signal sent by the controller and converting the driving signal from an analog signal to a digital signal;

the clock/data fan-out buffer is electrically connected with the analog-to-digital converter and is used for receiving the digital signals sent by the analog-to-digital converter and dividing the digital signals into 2 paths;

the delayer is electrically connected with the clock/data fan-out buffer and is used for respectively carrying out time delay processing on the 2 paths of digital signals, so that the 2 paths of digital signals are output at different time points, and time delay exists between the 2 paths of digital signals;

the processor is electrically connected with the delayer and is used for carrying out NAND operation on the 2 paths of digital signals input by the delayer to obtain a narrow pulse driving signal;

2. The laser driving apparatus according to claim 1, wherein the analog-to-digital converter is a high-speed comparator.

3. The laser driver of claim 1, wherein the clock/data fan-out buffer is of type NB7L11M.

4. The laser driving device according to claim 1, wherein the low-phase noise amplifier is of a type HMC460LC5.

5. The laser driving device according to claim 1, wherein the processor is of a model of NBSG86A.

6. The laser driving apparatus as claimed in claim 1, wherein the model of the delay device is NB6L295MMNG.