阅读说明：本技术 一种基于双光注入半导体激光器的微波频率梳产生装置 (Microwave frequency comb generating device based on double-light injection semiconductor laser ) 是由 周沛 李坤曦 李念强 杨闯 傅剑斌 刘世锋 于 2021-01-22 设计创作，主要内容包括：本发明公开了一种基于双光注入半导体激光器的微波频率梳产生装置,包括射频信号源、第一主激光器、第二主激光器,第一主激光器与第二主激光器远离射频信号源的另一端均设有光耦合器,光耦合器远离第一主激光器与第二主激光器的另一端设有光环行器,光环行器远离光耦合器的另外两端分别设有从激光器与光电探测器,第一主激光器、第二主激光器与光耦合器分别设有第一光衰减器、第一偏振控制器、第二光衰减器与第二偏振控制器。本发明的有益效果：核心部件为商用单模半导体激光器,具有结构简单、体积小、成本低的优点,所产生的微波频率梳具有带宽大、平坦度好、调谐灵活的优点,可产生更大带宽的微波频率梳的特点,成本低廉、易于实现。(The invention discloses a microwave frequency comb generating device based on a double-optical injection semiconductor laser, which comprises a radio frequency signal source, a first main laser and a second main laser, wherein optical couplers are respectively arranged at the other ends of the first main laser and the second main laser, which are far away from the radio frequency signal source, the other ends of the optical couplers, which are far away from the first main laser and the second main laser, are provided with optical circulators, the other two ends of the optical circulators, which are far away from the optical couplers, are respectively provided with a slave laser and a photoelectric detector, and the first main laser, the second main laser and the optical couplers are respectively provided with a first optical attenuator, a first polarization controller, a second optical attenuator and a second polarization controller. The invention has the beneficial effects that: the core component is a commercial single-mode semiconductor laser, the microwave frequency comb has the advantages of being simple in structure, small in size and low in cost, the generated microwave frequency comb has the advantages of being large in bandwidth, good in flatness and flexible in tuning, the microwave frequency comb with the larger bandwidth can be generated, and the microwave frequency comb is low in cost and easy to achieve.)

1. A microwave frequency comb generating device based on a double-light injection semiconductor laser comprises a radio frequency signal source (1) and is characterized in that: the high-power-consumption optical fiber laser is characterized in that two ends of a radio frequency signal source (1) are connected with a first main laser (2) and a second main laser (3) through radio frequency signals respectively, the other ends, far away from the radio frequency signal source (1), of the first main laser (2) and the second main laser (3) are connected with an optical coupler (6) through optical cables, the other ends, far away from the first main laser (2) and the second main laser (3), of the optical coupler (6) are connected with an optical circulator (9) through optical cables, the other two ends, far away from the optical coupler (6), of the optical circulator (9) are connected with a slave laser (10) and a photoelectric detector (11) through optical cables respectively, and a first optical attenuator (4), a first polarization controller (5) and a second polarization controller (11) are arranged on the optical cables, connected with the optical coupler (6), of the first main laser (2) and the second main laser (3) respectively, A second optical attenuator (7) and a second polarization controller (8).

2. A dual-injection semiconductor laser-based microwave frequency comb generating device as claimed in claim 1, wherein: the modulation frequency and the modulation depth of the radio frequency signal source (1) are used for enabling the first main laser (2) and the second main laser (3) to output a first seed source and a second seed source of a microwave frequency comb.

3. A dual-injection semiconductor laser-based microwave frequency comb generating device as claimed in claim 2, wherein: the first seed source is injected into the slave laser (10) to promote the slave laser (10) to generate a large-bandwidth microwave frequency comb by using a bandwidth enhancement effect caused by single light injection.

4. A dual-injection semiconductor laser-based microwave frequency comb generating device as claimed in claim 2, wherein: the second seed source is coupled with the first seed source output by the first main laser (2) through the optical coupler (6), and is injected into the slave laser (10) at the same time, and the bandwidth of the microwave frequency comb is expanded by utilizing the nonlinear frequency mixing effect caused by double-light injection, so that the microwave frequency comb with the ultra-large bandwidth is obtained.

5. A dual-injection semiconductor laser-based microwave frequency comb generating device as claimed in claim 1, wherein: the first main laser (2) and the second main laser (3) respectively output two seed microwave frequency combs, the two seed microwave frequency combs pass through the first optical attenuator (4), the first polarization controller (5), the second optical attenuator (7) and the second polarization controller (8), are coupled through the optical coupler (6), and then are injected into the slave laser (10) through the optical circulator (9), so that a dual-optical injection system is formed.

6. A dual-injection semiconductor laser-based microwave frequency comb generating device as claimed in claim 1, wherein: by adjusting the output wavelengths of the first master laser (2), the second master laser (3) and the slave laser (10) for varying detuning frequencies Δ f1 and Δ f 2.

7. A dual-injection semiconductor laser-based microwave frequency comb generating device as claimed in claim 1, wherein: the light injection intensities Kinj1 and Kinj2 are changed by adjusting the first optical attenuator (4) and the second optical attenuator (7).

8. A dual-injection semiconductor laser-based microwave frequency comb generating device as claimed in claim 1, wherein: matching polarization directions of the first master laser (2), the second master laser (3) and the slave laser (10) by adjusting the first polarization controller (5) and the second polarization controller (8).

9. A dual-injection semiconductor laser-based microwave frequency comb generating device as claimed in claim 1, wherein: the slave laser (10) is a single-mode semiconductor laser, the first master laser (2) and the second master laser (3) are single-mode laser sources, wherein the frequency of the first master laser (2) is greater than the frequency of the slave laser (10) and the frequency of the second master laser (3) is less than the frequency of the slave laser (10).

10. A dual-injection semiconductor laser-based microwave frequency comb generating device as claimed in claim 1, wherein: in the first seed source and the second seed source, the microwave frequency comb for the seeds is a microwave frequency comb with narrow bandwidth and large amplitude flatness value of comb teeth.

Technical Field

The invention relates to the technical field of communication, frequency measurement and microwave photonics, in particular to a microwave frequency comb generating device based on a double-light-injection semiconductor laser.

Background

With the development of the information industry, the demand for multi-frequency signals becomes more and more abundant. A multifunctional radio frequency system integrating various functions of 'radar, communication, electronic information war' and the like simultaneously needs a plurality of microwave local oscillator signals with different frequencies to realize corresponding radio frequency functions, a multiband radar with different functions (early warning, fire control and navigation) usually works in different frequency bands, namely, the microwave local oscillator signals with different frequencies are simultaneously needed to generate radar transmitting waveforms of corresponding different frequency bands, a microwave frequency comb is composed of a series of microwave signals with equal frequency intervals, the microwave frequency comb has a comb-like spectrum structure, and meanwhile, the characteristic of large bandwidth meets the requirement of the existing stage on multi-frequency signals. Due to the limitation of the bandwidth of the conventional electrical components, the development of the microwave frequency comb using the conventional step recovery diode device has a bottleneck, which limits the further improvement of the bandwidth of the microwave frequency comb (see q.l. Li and w.s. Jiang, "Analysis and design of the microwave-band generator based SRD",2012 International Conference on Microwave and Millimeter Wave Technology(ICMMT), Shenzhen, 2012, pp. 1-3]) Researchers have therefore proposed various microwave frequency comb generation schemes based on photonic technology to overcome this electronic bottleneck. The more classical ultrafast laser pulse aggregation in microwave frequency comb generation schemes based on photonic technology produces microwave frequency combs on the tunnel sections of scanning tunneling microscopes (see m.j. Hagmann and f.s. singer, "Linewidth of the harmonic in a microwave frequency comb generated by a microwave frequency comb module-locked ultra-fast laser on a tunneling junction",J. Appl. Phys, vol. 114, no. 22, pp. 223107-223107-6. Dec. 2013]) However, in this scheme, the pulse repetition frequency output by the mode-locked laser determines the spacing of the ultrafast laser gratings, so that the comb teeth spacing of the microwave frequency comb cannot be adjusted at will, and the microwave frequency comb is generated by using the harmonic frequency locking state of the negative electro-optical feedback laser (see [ s.c. Chan and g.q.xi ]a, “Optical generation of a precise microwave frequency comb by harmonic frequency locking”, Opt. Lett, vol. 32, no. 13, pp. 1917-1919, Jul. 2007]) Due to the bandwidth limitation of the electronic components in the electro-optical feedback loop, the resulting microwave frequency comb has only a bandwidth of several GHz and very severe non-simple harmonic spikes.

At present, there has been preliminary research on the scheme of generating a large-bandwidth microwave frequency comb using the bandwidth enhancement effect caused by a single-light injection semiconductor laser (see [ x.q. Xu and l. Fan "," digital excitation on ultra-broad and tunable microwave frequency comb generation using a semiconductor laser unit and regular pulse information ",IEEEE Access, vol. 6, pp. 55284-55290, 2018]) However, the bandwidth of the microwave frequency comb generated based on the single-light-injection semiconductor laser is difficult to further improve, and on the basis, a scheme for expanding the bandwidth of the microwave frequency comb generated under the single-light-injection semiconductor laser by utilizing the nonlinear mixing effect caused by the double-light-injection semiconductor laser is provided.

Disclosure of Invention

The present invention is directed to a microwave frequency comb generating device based on a dual-optical injection semiconductor laser, so as to solve the problems mentioned in the background art.

In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides a microwave frequency comb produces device based on two optical injection semiconductor laser, includes the radio frequency signal source, radio frequency signal source both ends are connected with first main laser, second main laser through radio frequency signal respectively, first main laser with second main laser keeps away from the other end of radio frequency signal source all is connected with the optical coupler through the optical cable, the optical coupler is kept away from first main laser with the other end of second main laser passes through the optical cable and is connected with the optical circulator, the optical circulator is kept away from the other both ends of optical coupler are connected with from laser instrument and photoelectric detector through the optical cable respectively, first main laser, second main laser with be equipped with first optical attenuator, first polarization controller, second optical attenuator and second polarization controller on the optical cable that the optical coupler is connected respectively.

Preferably, the modulation frequency and the modulation depth of the radio frequency signal source are used for enabling the first main laser and the second main laser to output a first seed source and a second seed source of a microwave frequency comb.

Preferably, the first seed source is injected into the slave laser, and the slave laser is promoted to generate a microwave frequency comb with a large bandwidth by using a bandwidth enhancement effect caused by single light injection.

Preferably, the second seed source is coupled with the first seed source output by the first master laser through the optical coupler, and is injected into the slave laser at the same time, and the bandwidth of the microwave frequency comb is expanded by utilizing the nonlinear mixing effect caused by double-light injection, so that the microwave frequency comb with the ultra-large bandwidth is obtained.

Preferably, the first master laser and the second master laser output two seed microwave frequency combs respectively, and the two seed microwave frequency combs pass through the first optical attenuator, the first polarization controller, the second optical attenuator and the second polarization controller, are coupled by the optical coupler, and then are injected into the slave laser through the optical circulator, so as to form a dual-optical injection system.

Preferably, the detuning frequencies Δ f1 and Δ f2 are varied by adjusting the output wavelengths of the first master laser, the second master laser, and the slave laser.

Preferably, the first optical attenuator and the second optical attenuator are adjusted to change the light injection intensities Kinj1 and Kinj 2.

Preferably, the polarization directions of the first master laser, the second master laser and the slave laser are matched by adjusting the first polarization controller and the second polarization controller.

Preferably, the slave laser is a single-mode semiconductor laser, and both the first master laser and the second master laser are single-mode laser sources, wherein the frequency of the first master laser is greater than the frequency of the slave laser and the frequency of the second master laser is less than the frequency of the slave laser.

Preferably, in the first seed source and the second seed source, the microwave frequency comb for the seeds is a microwave frequency comb with a narrow bandwidth and a large amplitude flatness value of the comb teeth.

Advantageous effects

Compared with the existing microwave frequency comb generation scheme, the microwave frequency comb generation device based on the double-light injection semiconductor laser has the advantages that the core component is a commercial single-mode semiconductor laser, the microwave frequency comb generation device has the advantages of simple structure, small size and low cost, the generated microwave frequency comb has the advantages of large bandwidth, good flatness and flexible tuning, the microwave frequency comb with larger bandwidth can be generated, the cost is low, and the realization is easy.

Drawings

FIG. 1 is a schematic plan view of the overall structure of the present invention;

FIG. 2 is a graph of a microwave frequency comb spectrum based on a single light injection semiconductor laser;

fig. 3 is a graph of the microwave frequency comb spectrum of a semiconductor laser based on dual optical injection.

Reference numerals

The method comprises the following steps of 1-a radio frequency signal source, 2-a first main laser, 3-a second main laser, 4-a first optical attenuator, 5-a first polarization controller, 6-an optical coupler, 7-a second optical attenuator, 8-a second polarization controller, 9-an optical circulator, 10-a slave laser and 11-a photoelectric detector.

Detailed Description

The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.

Examples

As shown in fig. 1, a microwave frequency comb generating device based on a dual-optical injection semiconductor laser comprises a radio frequency signal source 1, two ends of the radio frequency signal source 1 are respectively connected with a first main laser 2 and a second main laser 3 through radio frequency signals, the other ends of the first main laser 2 and the second main laser 3 far away from the radio frequency signal source 1 are both connected with an optical coupler 6 through optical cables, the other ends of the optical coupler 6 far away from the first main laser 2 and the second main laser 3 are connected with an optical circulator 9 through optical cables, the other two ends of the optical circulator 9 far away from the optical coupler 6 are respectively connected with a slave laser 10 and a photoelectric detector 11 through optical cables, the optical cables connecting the first main laser 2 and the second main laser 3 with the optical coupler 6 are respectively provided with a first optical attenuator 4, a first polarization controller 5, a second optical attenuator 7 and a second polarization controller 8.

Preferably, the modulation frequency and the modulation depth of the radio frequency signal source 1 are used for enabling the first main laser 2 and the second main laser 3 to output a first seed source and a second seed source of a microwave frequency comb.

Preferably, a first seed source is injected into the slave laser 10 to facilitate the generation of a large bandwidth microwave frequency comb from the laser 10 by using the bandwidth enhancing effect caused by a single light injection.

Preferably, the second seed source is coupled with the first seed source output by the first main laser 2 through the optical coupler 6, and is injected into the slave laser 10 at the same time, and the bandwidth of the microwave frequency comb is expanded by utilizing the nonlinear mixing effect caused by double-light injection, so that the microwave frequency comb with the ultra-large bandwidth is obtained.

Preferably, the first main laser 2 and the second main laser 3 output two seed microwave frequency combs respectively, and the two seed microwave frequency combs are coupled by the optical coupler 6 through the first optical attenuator 4, the first polarization controller 5, the second optical attenuator 7 and the second polarization controller 8, and then injected into the slave laser 10 through the optical circulator 9 to form a dual optical injection system.

Preferably, the detuning frequencies Δ f1 and Δ f2 are varied by adjusting the output wavelengths of first master laser 2, second master laser 3, and slave laser 10.

Preferably, the light injection intensities Kinj1 and Kinj2 are changed by adjusting the first optical attenuator 4 and the second optical attenuator 7.

Preferably, the polarization directions of the first master laser 2, the second master laser 3 and the slave laser 10 are matched by adjusting the first polarization controller 5 and the second polarization controller 8.

Preferably, the slave laser 10 is a single-mode semiconductor laser, and the first master laser 2 and the second master laser 3 are both single-mode laser sources, wherein the frequency of the first master laser 2 is greater than the frequency of the slave laser 10 and the frequency of the second master laser 3 is less than the frequency of the slave laser 10.

Preferably, in the first seed source and the second seed source, the microwave frequency comb for the seeds is a microwave frequency comb with a narrow bandwidth and a large amplitude flatness value of the comb teeth.

A radio frequency signal source is adopted to modulate the driving current of the main laser, and the first main laser outputs a seed source of a microwave frequency comb by adjusting the modulation frequency and the modulation depth of the output signal of the radio frequency signal source; injecting the generated seed microwave frequency comb into a slave laser, and promoting the slave laser to generate a microwave frequency comb with a large bandwidth by utilizing a bandwidth enhancement effect caused by single light injection; simultaneously introducing a second main laser, and modulating the second main laser by adopting a radio frequency signal source which is the same as that for modulating the first main laser so as to enable the second main laser to output a seed source of a microwave frequency comb; the generated seed microwave frequency comb is coupled with the seed microwave frequency comb output by the first main laser through the optical coupler and is injected into the slave laser, and the bandwidth of the generated microwave frequency comb can be effectively expanded by utilizing the nonlinear frequency mixing effect caused by double-light injection, so that the microwave frequency comb with the ultra-large bandwidth is obtained. In the microwave frequency comb generation scheme of the single-light injection semiconductor laser, a large-bandwidth microwave frequency comb with the bandwidth of 72.6 GHz (within 10dB amplitude flatness) is obtained; after the second main laser is introduced, the ultra-wide bandwidth microwave frequency comb with balanced power and stable frequency in the frequency range of 6.6 GHz to 125.4 GHz and with the bandwidth reaching 118.8GHz (within 10dB amplitude flatness) level is finally obtained in the microwave frequency comb generation scheme of the double-light injection semiconductor laser.

Further elaboration is as follows:

the parameters of the first master laser, the second master laser and the slave laser are set as follows: threshold currents of the first main laser, the second main laser and the slave laser in free running are all 9.8 mA; the bias current of the first main laser and the bias current of the second main laser are both controlled to be 25 mA, and the relaxation oscillation frequency is 8.2 GHz. (ii) a By adjusting the modulation frequency of the output signal of the radio frequency signal source to be 3.3 GHz and the modulation depth to be 0.92 (modulation depth = modulation current/laser bias)Current is put), so that the first main laser outputs a seed source of a microwave frequency comb; injecting the generated seed microwave frequency comb into a slave laser, and promoting the slave laser to generate a large-bandwidth microwave frequency comb by utilizing a bandwidth enhancement effect caused by single light injection, so that the large-bandwidth microwave frequency comb with the bandwidth of 72.6 GHz (within 10dB amplitude flatness) level is generated; simultaneously introducing a second main laser, and modulating the second main laser by adopting a radio frequency signal source (the modulation frequency is 3.3 GHz and the modulation depth is 0.92) which is the same as that of the first main laser, so that the second main laser outputs a seed source of a microwave frequency comb; the generated seed microwave frequency comb is coupled with a seed microwave frequency comb output by a first main laser through an optical coupler and is injected into a secondary laser at the same time, and the bandwidth of the generated microwave frequency comb can be effectively expanded by utilizing the nonlinear frequency mixing effect caused by double-light injection, so that the microwave frequency comb with the ultra-large bandwidth is obtained; by adjusting the detuning frequency of the first and second master lasers with respect to the slave laser and the injection intensity of the first and second master lasers into the slave laser, the bandwidth of the microwave frequency comb output from the lasers can be optimized. The results show that the detuning frequency of the first main laser and the second main laser is adjusted to be delta f₁=39 GHz and Δ f₂K is the injection intensity of the first main laser and the second main laser to the slave laser_inj1=2 and K_inj2=0.6, a very wide bandwidth microwave frequency comb can be obtained with a maximum bandwidth of 118.8GHz (within 10dB amplitude flatness) level in the frequency range of 6.6 GHz to 125.4 GHz.

In summary, based on the scheme of generating the microwave frequency comb by the double-light injection semiconductor laser, the bandwidth range of the generated microwave frequency beam can be effectively expanded on the basis of generating the microwave frequency comb by the single-light injection semiconductor laser, and the ultra-wide bandwidth microwave frequency comb with balanced power, stable frequency and bandwidth reaching 118.8GHz (within 10dB amplitude flatness) level in the frequency range of 6.6 GHz to 125.4 GHz can be realized.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the content of the present invention within the scope of the protection of the present invention.