CN1976141A - Single frequency tunable doped erbium optical fiber laser system - Google Patents

Single frequency tunable doped erbium optical fiber laser system Download PDF

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CN1976141A
CN1976141A CN 200610165117 CN200610165117A CN1976141A CN 1976141 A CN1976141 A CN 1976141A CN 200610165117 CN200610165117 CN 200610165117 CN 200610165117 A CN200610165117 A CN 200610165117A CN 1976141 A CN1976141 A CN 1976141A
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resistor
optical fiber
piezoelectric ceramic
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fiber
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CN100423384C (en
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欧攀
张春熹
贾豫东
胡姝玲
刘殿君
曹彬
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Beihang University
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Abstract

本发明公开了一种单频可调谐掺铒光纤激光器系统,所述激光器中第一波分复用器、第二波分复用器、第一掺铒光纤、第二掺铒光纤、偏振控制器、第一光纤环形器和光纤布拉格光栅构成了一个环形谐振腔;第一泵浦光源、第二泵浦光源、第一波分复用器、第二波分复用器、第一掺铒光纤、第二掺铒光纤、偏振控制器、第一光纤环形器、第二光纤环形器、光纤布拉格光栅、耦合器、光探测器、布里渊散射腔、混频器、第一压电陶瓷和第二压电陶瓷构成所述激光器中的光路部分;压电陶瓷驱动电路、信号处理电路、第一泵浦光源驱动电路、第二泵浦光源驱动电路构成所述激光器中的处理电路部分;该光纤激光器系统通过基于环形腔的单频单偏振可调谐掺铒光纤激光器所涉及的纵模选择、线宽压缩、频率稳定和调谐等理论和技术,使激光频率稳定可调谐。

The invention discloses a single-frequency tunable erbium-doped fiber laser system. In the laser, a first wavelength division multiplexer, a second wavelength division multiplexer, a first erbium-doped fiber, a second erbium-doped fiber, a polarization control The device, the first fiber circulator and the fiber Bragg grating constitute a ring resonant cavity; the first pump light source, the second pump light source, the first wavelength division multiplexer, the second wavelength division multiplexer, the first erbium-doped Optical fiber, second erbium-doped optical fiber, polarization controller, first fiber circulator, second fiber circulator, fiber Bragg grating, coupler, photodetector, Brillouin scattering cavity, mixer, first piezoelectric ceramic and the second piezoelectric ceramic constitute the optical path part in the laser; the piezoelectric ceramic driving circuit, the signal processing circuit, the first pumping light source driving circuit, and the second pumping light source driving circuit constitute the processing circuit part in the laser; The fiber laser system makes the laser frequency stable and tunable through the theory and technology of longitudinal mode selection, line width compression, frequency stabilization and tuning involved in the single-frequency single-polarization tunable Erbium-doped fiber laser based on the ring cavity.

Description

单频可调谐掺铒光纤激光器系统Single-frequency tunable Erbium-doped fiber laser system

技术领域technical field

本发明涉及一种光纤激光器,更特别地说,是指一种极窄线宽的单频工作激光光源的单频可调谐掺铒光纤激光器系统。The present invention relates to a fiber laser, more particularly, refers to a single-frequency tunable erbium-doped fiber laser system with a single-frequency working laser light source with extremely narrow line width.

背景技术Background technique

光纤激光器在光通信、传感、光谱学等领域有着广泛的应用。早在上世纪60年代,E.Snitzer就发现了Nd3+掺杂的玻璃波导中的激光发射现象,而后由于半导体激光器的出现使人们把注意力转移到其上。直到80年代英国Southampton大学解决了Er掺杂有源光纤的热淬灭问题,使得光纤放大器成为可能。光纤放大器的成功和走向成熟,极大地带动了各种各样的光纤激光器的研究。1978年Hill发现了光纤光敏光栅现象,直至上世纪90年代,用紫外线(UV)写入光纤光栅技术的不断成熟,使得光纤光栅成为光纤激光器极佳的选频器。从此光纤激光器摆脱了用体光学元件作为选频器的局面,使得光纤激光器小型化成为可能,并使其可靠性极大地提高。Fiber lasers are widely used in optical communication, sensing, spectroscopy and other fields. As early as the 1960s, E. Snitzer discovered the laser emission phenomenon in Nd 3+ doped glass waveguide, and then people turned their attention to it due to the appearance of semiconductor lasers. Until the 1980s, the University of Southampton in the United Kingdom solved the problem of thermal quenching of Er-doped active optical fibers, making optical fiber amplifiers possible. The success and maturity of fiber amplifiers has greatly promoted the research of various fiber lasers. In 1978, Hill discovered the phenomenon of fiber photosensitive gratings. Until the 1990s, the technology of using ultraviolet (UV) to write fiber gratings continued to mature, making fiber gratings an excellent frequency selector for fiber lasers. Since then, the fiber laser has got rid of the situation of using bulk optical elements as a frequency selector, which makes it possible to miniaturize the fiber laser and greatly improves its reliability.

发明内容Contents of the invention

本发明的目的是提供一种单频可调谐掺铒光纤激光器系统,该光纤激光器系统通过基于环形腔的单频单偏振可调谐掺铒光纤激光器所涉及的纵模选择、线宽压缩、频率稳定和调谐等理论和技术,使激光频率稳定可调谐。The object of the present invention is to provide a single-frequency tunable erbium-doped fiber laser system, the fiber laser system through the longitudinal mode selection, line width compression, frequency stability involved in the single-frequency single-polarization tunable erbium-doped fiber laser based on ring cavity And tuning and other theories and technologies to make the laser frequency stable and tunable.

本发明是一种单频可调谐掺铒光纤激光器系统,所述激光器中第一波分复用器、第二波分复用器、第一掺铒光纤、第二掺铒光纤、偏振控制器、第一光纤环形器和光纤布拉格光栅构成了一个环形谐振腔;第一泵浦光源、第二泵浦光源、第一波分复用器、第二波分复用器、第一掺铒光纤、第二掺铒光纤、偏振控制器、第一光纤环形器、第二光纤环形器、光纤布拉格光栅、耦合器、光探测器、布里渊散射腔、混频器、第一压电陶瓷和第二压电陶瓷构成所述激光器中的光路部分;压电陶瓷驱动电路、信号处理电路、第一泵浦光源驱动电路、第二泵浦光源驱动电路构成所述激光器中的处理电路部分。The present invention is a single-frequency tunable erbium-doped fiber laser system. In the laser, a first wavelength division multiplexer, a second wavelength division multiplexer, a first erbium-doped fiber, a second erbium-doped fiber, and a polarization controller , the first fiber circulator and the fiber Bragg grating constitute a ring resonator; the first pump light source, the second pump light source, the first wavelength division multiplexer, the second wavelength division multiplexer, the first erbium-doped fiber , a second erbium-doped fiber, a polarization controller, a first fiber circulator, a second fiber circulator, a fiber Bragg grating, a coupler, a photodetector, a Brillouin scattering cavity, a mixer, a first piezoelectric ceramic and The second piezoelectric ceramic constitutes the optical path part of the laser; the piezoelectric ceramic driving circuit, the signal processing circuit, the first pumping light source driving circuit, and the second pumping light source driving circuit constitute the processing circuit part of the laser.

所述的单频可调谐掺铒光纤激光器系统,其耦合器、第二光纤环形器、光探测器、布里渊散射腔、混频器、第一压电陶瓷、第二压电陶瓷、压电陶瓷驱动电路形成一个闭环稳频及纵模锁定。The single-frequency tunable erbium-doped fiber laser system includes a coupler, a second fiber circulator, a photodetector, a Brillouin scattering cavity, a mixer, a first piezoelectric ceramic, a second piezoelectric ceramic, and a piezoelectric ceramic. The electric ceramic drive circuit forms a closed-loop frequency stabilization and longitudinal mode locking.

本发明单频可调谐掺铒光纤激光器系统的优点在于:(1)具有极窄线宽,作为一种单纵模工作激光器,线宽可以达到1kHz以下,具有很长的相干长度;(2)可以实现宽带频率调制,采用压电陶瓷对选频器(光栅)进行波长调制,可以达到纳米量级的可调范围,适合于采用频率调制连续波(FMCW)技术进行检测;(3)高可靠与长寿命,由于有源介质面积/体积比较大,不需要冷却,仅需控制泵浦源,寿命可达10万小时。The advantages of the single-frequency tunable erbium-doped fiber laser system of the present invention are: (1) have an extremely narrow linewidth, as a single longitudinal mode working laser, the linewidth can reach below 1kHz, and have a very long coherence length; (2) Broadband frequency modulation can be realized, and piezoelectric ceramics are used to modulate the wavelength of the frequency selector (grating), which can reach an adjustable range of nanometers, and is suitable for detection by frequency modulated continuous wave (FMCW) technology; (3) High reliability And long life, due to the large area/volume of the active medium, no cooling is required, only the pump source needs to be controlled, and the life can reach 100,000 hours.

附图说明Description of drawings

图1是本发明单频可调谐掺铒光纤激光器的结构图。Fig. 1 is a structural diagram of a single-frequency tunable erbium-doped fiber laser of the present invention.

图2是本发明信号处理电路、压电陶瓷驱动电路的原理图。Fig. 2 is a schematic diagram of the signal processing circuit and the piezoelectric ceramic drive circuit of the present invention.

图3A是本发明第一泵浦光源驱动电路的原理图。FIG. 3A is a schematic diagram of the driving circuit of the first pumping light source of the present invention.

图3B是本发明第二泵浦光源驱动电路的原理图。FIG. 3B is a schematic diagram of the driving circuit of the second pumping light source of the present invention.

图中:1.第一泵浦光源           2.第一波分复用器   3.第一掺铒光纤In the figure: 1. The first pump light source 2. The first wavelength division multiplexer 3. The first erbium-doped fiber

      4.偏振控制器             5.第一光纤环形器   6.第二掺铒光纤  7.光纤布拉格光栅4. Polarization controller 5. The first fiber circulator 6. The second erbium-doped fiber 7. Fiber Bragg grating

      8.耦合器                 10.第二光纤环形器  11.第二泵浦光源8. Coupler 10. The second optical fiber circulator 11. The second pump light source

      12.第二波分复用器        13.光探测器        14.布里渊散射腔12. Second wavelength division multiplexer 13. Optical detector 14. Brillouin scattering cavity

      15.混频器                16.第一压电陶瓷    17.第二压电陶瓷15. Mixer 16. The first piezoelectric ceramic 17. The second piezoelectric ceramic

      18.压电陶瓷驱动电路      19.信号处理电路18. Piezoelectric ceramic drive circuit 19. Signal processing circuit

      21.第一泵浦光源驱动电路  22.第二泵浦光源驱动电路21. The first pump light source drive circuit 22. The second pump light source drive circuit

具体实施方式Detailed ways

下面将结合附图对本发明做进一步的详细说明。The present invention will be further described in detail below in conjunction with the accompanying drawings.

本发明是一种单频可调谐掺铒光纤激光器系统,由第一泵浦光源1、第二泵浦光源11、第一波分复用器2、第二波分复用器12、第一掺铒光纤3、第二掺铒光纤6、偏振控制器4、第一光纤环形器5、第二光纤环形器10、光纤布拉格光栅7、耦合器8、光探测器13、布里渊散射腔14、混频器15、第一压电陶瓷16、第二压电陶瓷17、压电陶瓷驱动电路18、信号处理电路19、第一泵浦光源驱动电路21、第二泵浦光源驱动电路22组成;在本发明中,根据功能不同可以分为光路部分和电路部分,光路部分通过光纤熔接,而电路部分为电信号联接。The present invention is a single-frequency tunable erbium-doped fiber laser system, which consists of a first pumping light source 1, a second pumping light source 11, a first wavelength division multiplexer 2, a second wavelength division multiplexer 12, a first Erbium-doped fiber 3, second erbium-doped fiber 6, polarization controller 4, first fiber circulator 5, second fiber circulator 10, fiber Bragg grating 7, coupler 8, photodetector 13, Brillouin scattering cavity 14. Mixer 15, first piezoelectric ceramic 16, second piezoelectric ceramic 17, piezoelectric ceramic driving circuit 18, signal processing circuit 19, first pumping light source driving circuit 21, second pumping light source driving circuit 22 Composition; In the present invention, according to different functions, it can be divided into an optical path part and a circuit part, the optical path part is welded through optical fibers, and the circuit part is connected by electrical signals.

在本发明中,第一泵浦光源1与第一波分复用器2的A端之间连接有光纤,第一波分复用器2的C端与偏振控制器4的入纤熔接,第一波分复用器2的B端与第一掺铒光纤3熔接;第二泵浦光源11与第二波分复用器12的A端之间连接有光纤,第二波分复用器12的C端与第一光纤环形器5的B端熔接,第二波分复用器12的B端与第一掺铒光纤3熔接;偏振控制器4的尾纤与第一光纤环形器5的A端熔接,第一光纤环形器5的C端与第二掺铒光纤6的一端熔接,第二掺铒光纤6另一端与光纤布拉格光栅7的一端熔接;这些器件(第一波分复用器2、第二波分复用器12、第一掺铒光纤3、第二掺铒光纤6、偏振控制器4、第一光纤环形器5和光纤布拉格光栅7)构成了一个环形谐振腔,该环形谐振腔用于产生窄线宽激光。光纤布拉格光栅7的另一端与第一耦合器8的A端之间连接有光纤,第一耦合器8的B端与第二光纤环形器10的A端之间连接有光纤,第二光纤环形器10的B端与光探测器13之间连接有光纤,第二光纤环形器10的C端与布里渊散射腔14的输出端之间连接有光纤;第一耦合器8的C端输出单频可调谐激光束;光探测器13与混频器15之间连接有光纤;第二掺铒光纤6与第一压电陶瓷16之间连接有光纤,光纤布拉格光栅7与第二压电陶瓷17之间连接有光纤;所述器件(第一泵浦光源1、第二泵浦光源11、第一波分复用器2、第二波分复用器12、第一掺铒光纤3、第二掺铒光纤6、偏振控制器4、第一光纤环形器5、第二光纤环形器10、光纤布拉格光栅7、耦合器8、光探测器13、布里渊散射腔14、混频器15、第一压电陶瓷16和第二压电陶瓷17)构成本发明中的所述光路部分。In the present invention, an optical fiber is connected between the first pump light source 1 and the A end of the first wavelength division multiplexer 2, and the C end of the first wavelength division multiplexer 2 is fused with the input fiber of the polarization controller 4, The B end of the first wavelength division multiplexer 2 is fused with the first erbium-doped optical fiber 3; an optical fiber is connected between the second pump light source 11 and the A end of the second wavelength division multiplexer 12, and the second wavelength division multiplexer The C end of the device 12 is fused with the B end of the first optical fiber circulator 5, and the B end of the second wavelength division multiplexer 12 is fused with the first erbium-doped optical fiber 3; the pigtail of the polarization controller 4 is fused with the first optical fiber circulator The A end of 5 is welded, the C end of the first optical fiber circulator 5 is welded with one end of the second erbium-doped optical fiber 6, and the second erbium-doped optical fiber 6 other end is welded with an end of the fiber Bragg grating 7; these devices (first wavelength division Multiplexer 2, second wavelength division multiplexer 12, first erbium-doped fiber 3, second erbium-doped fiber 6, polarization controller 4, first fiber circulator 5 and fiber Bragg grating 7) constitute a ring resonance Cavity, the ring resonator is used to generate narrow linewidth laser light. An optical fiber is connected between the other end of the fiber Bragg grating 7 and the A end of the first coupler 8, an optical fiber is connected between the B end of the first coupler 8 and the A end of the second fiber circulator 10, and the second optical fiber ring An optical fiber is connected between the B end of the device 10 and the photodetector 13, an optical fiber is connected between the C end of the second fiber circulator 10 and the output end of the Brillouin scattering cavity 14; the C end of the first coupler 8 outputs A single-frequency tunable laser beam; an optical fiber is connected between the photodetector 13 and the mixer 15; an optical fiber is connected between the second erbium-doped optical fiber 6 and the first piezoelectric ceramic 16, and the fiber Bragg grating 7 and the second piezoelectric ceramic Optical fibers are connected between the ceramics 17; , second erbium-doped fiber 6, polarization controller 4, first fiber circulator 5, second fiber circulator 10, fiber Bragg grating 7, coupler 8, photodetector 13, Brillouin scattering cavity 14, frequency mixing The device 15, the first piezoelectric ceramic 16 and the second piezoelectric ceramic 17) constitute the optical path part in the present invention.

信号处理电路19与第一泵浦光源驱动电路21、第二泵浦光源驱动电路22、压电陶瓷驱动电路18采用电信号联接,压电陶瓷驱动电路18输出驱动信号给第一压电陶瓷16和第二压电陶瓷17,所述器件(压电陶瓷驱动电路18、信号处理电路19、第一泵浦光源驱动电路21、第二泵浦光源驱动电路22)构成本发明中的所述电路部分。The signal processing circuit 19 is connected with the first pumping light source driving circuit 21, the second pumping light source driving circuit 22, and the piezoelectric ceramic driving circuit 18 using electrical signals, and the piezoelectric ceramic driving circuit 18 outputs a driving signal to the first piezoelectric ceramic 16 and the second piezoelectric ceramic 17, the devices (piezoelectric ceramic driving circuit 18, signal processing circuit 19, first pumping light source driving circuit 21, second pumping light source driving circuit 22) constitute the circuit in the present invention part.

在本发明中,耦合器8、第二光纤环形器10、光探测器13、布里渊散射腔14、混频器15、第一压电陶瓷16、第二压电陶瓷17、压电陶瓷驱动电路18形成一个闭环稳频及纵模锁定。具有极窄线宽,作为一种单纵模工作激光器,线宽可以达到1kHz以下,具有很长的相干长度。In the present invention, the coupler 8, the second optical fiber circulator 10, the photodetector 13, the Brillouin scattering cavity 14, the mixer 15, the first piezoelectric ceramic 16, the second piezoelectric ceramic 17, the piezoelectric ceramic The driving circuit 18 forms a closed-loop frequency stabilization and longitudinal mode locking. It has an extremely narrow linewidth. As a single longitudinal mode working laser, the linewidth can reach below 1kHz and has a very long coherence length.

在本发明中,第一波分复用器2和第二波分复用器12选取两波长波分复用器,信号处理电路19选取DSP处理器TMS320F系列。In the present invention, the first wavelength division multiplexer 2 and the second wavelength division multiplexer 12 are two-wavelength wavelength division multiplexers, and the signal processing circuit 19 is a DSP processor TMS320F series.

本发明中电路部分之间的联接为:信号处理电路U1的25、34、40、92、93端分别与压电陶瓷驱动电路U6的16、18、19、22、23端联接,信号处理电路U1的174端与混频器15的输出信号端联接;压电陶瓷驱动电路U6的13端与第二泵浦光源驱动电路U1B的2端联接,压电陶瓷驱动电路U6的14端与第一泵浦光源驱动电路U1A的2端联接,压电陶瓷驱动电路U6的10端经电阻R1后与第二压电陶瓷17的运算放大器U8的2端联接,压电陶瓷驱动电路U6的12端经电阻R2后与第一压电陶瓷16的运算放大器U7的2端联接;运算放大器U8的2端与6端串联有电阻R3,3端接地,4端接-12V电压,地与4端之间接有电容C11,7端接+12V电压,地与7端之间接有电容C10,6端与第二压电陶瓷17联接;运算放大器U7的2端与6端串联有电阻R4,3端接地,4端接-12V电压,地与4端之间接有电容C9,7端接+12V电压,地与7端之间接有电容C8,6端与第一压电陶瓷16联接。The connection between the circuit parts in the present invention is: the 25, 34, 40, 92, 93 ends of the signal processing circuit U1 are respectively connected with the 16, 18, 19, 22, 23 ends of the piezoelectric ceramic drive circuit U6, and the signal processing circuit Terminal 174 of U1 is connected to the output signal terminal of mixer 15; terminal 13 of the piezoelectric ceramic driving circuit U6 is connected to terminal 2 of the second pumping light source driving circuit U1B, and terminal 14 of the piezoelectric ceramic driving circuit U6 is connected to the first The 2 terminals of the pumping light source driving circuit U1A are connected, the 10 terminal of the piezoelectric ceramic driving circuit U6 is connected with the 2 terminals of the operational amplifier U8 of the second piezoelectric ceramic 17 through the resistor R1, and the 12 terminals of the piezoelectric ceramic driving circuit U6 are connected via the resistor R1. Resistor R2 is then connected to terminal 2 of the operational amplifier U7 of the first piezoelectric ceramic 16; terminal 2 and terminal 6 of the operational amplifier U8 are connected in series with a resistor R3, terminal 3 is grounded, terminal 4 is connected to -12V voltage, and terminal 4 is connected to There is a capacitor C11, terminal 7 is connected to +12V voltage, a capacitor C10 is connected between the ground and terminal 7, terminal 6 is connected to the second piezoelectric ceramic 17; terminal 2 and terminal 6 of the operational amplifier U7 are connected in series with a resistor R4, terminal 3 is grounded, Terminal 4 is connected to -12V voltage, a capacitor C9 is connected between the ground and terminal 4, terminal 7 is connected to a voltage of +12V, a capacitor C8 is connected between the ground and terminal 7, and terminal 6 is connected to the first piezoelectric ceramic 16 .

在本发明中,光源驱动电路包括高精度恒流源电路,光源管芯温度控制电路组成。高精度恒流源电路提供稳定的电流输出,使光源输出功率稳定;光源管芯温度控制电路利用稳定管芯的温敏电阻,把管芯工作在稳定的温度环境下,使光源工作不受外界温度影响,输出功率更加稳定。各端子的连接如图3A所示,D/A转换电路输出的第一路模拟控制电压信号与压电陶瓷驱动电路U6之间联接有电阻R6,电阻R6另一端与运算放大器U1A的反相输入端2联接,运算放大器U1A的输出端1与电阻R5联接,电阻R5另一端与运算放大器U2A的反相输入端2联接,运算放大器U2A的输出端1与三极管Q1的基极联接,三极管Q1的发射极与电阻R9联接,三极管Q1的集电极接地,电阻R9的另一端与第一泵浦光源1相连,电阻R10一端与电阻R9联接,电阻R10另一端与电阻R5联接,电阻R7一端与电阻R5联接,电阻R7另一端与电阻R6联接,电阻R8一端与电阻R6联接,电阻R8另一端与电阻R9联接,其中,电阻R10为运算放大器U2A的反馈电阻,电阻R7为运算放大器U1A的反馈电阻,电阻R9和电阻R8共同构成运算放大器U2A和运算放大器U1A的反馈电阻。参见图3B所示,D/A转换电路输出的第二路模拟控制电压信号与压电陶瓷驱动电路U6之间联接有电阻R11,电阻R11另一端与运算放大器U1B的反相输入端2联接,运算放大器U1B的输出端1与电阻R12联接,电阻R12另一端与运算放大器U2B的反相输入端2联接,运算放大器U2B的输出端1与三极管Q2的基极联接,三极管Q2的发射极与电阻R15联接,三极管Q2的集电极接地,电阻R15的另一端与第二泵浦光源11相连,电阻R16一端与电阻R15联接,电阻R16另一端与电阻R12联接,电阻R13一端与电阻R12联接,电阻R13另一端与电阻R11联接,电阻R14一端与电阻R11联接,电阻R14另一端与电阻R15联接,其中,电阻R16为运算放大器U2B的反馈电阻,电阻R13为运算放大器U1B的反馈电阻,电阻R15和电阻R14共同构成运算放大器U2B和运算放大器U1B的反馈电阻。恒流源电路采用集成运放和三级管结合构成宽带压控恒流源,光源管芯温度控制电路采用由热敏电阻构成的电桥来控制光源管芯温度。In the present invention, the light source drive circuit includes a high-precision constant current source circuit and a light source tube core temperature control circuit. The high-precision constant current source circuit provides stable current output, so that the output power of the light source is stable; the temperature control circuit of the light source die uses the temperature-sensitive resistor of the stable die, and the die works in a stable temperature environment, so that the work of the light source is not affected by the outside world. The output power is more stable due to the influence of temperature. The connection of each terminal is shown in Figure 3A. A resistor R6 is connected between the first analog control voltage signal output by the D/A conversion circuit and the piezoelectric ceramic drive circuit U6, and the other end of the resistor R6 is connected to the inverting input of the operational amplifier U1A. The terminal 2 is connected, the output terminal 1 of the operational amplifier U1A is connected with the resistor R5, the other terminal of the resistor R5 is connected with the inverting input terminal 2 of the operational amplifier U2A, the output terminal 1 of the operational amplifier U2A is connected with the base of the transistor Q1, and the transistor Q1 The emitter is connected to the resistor R9, the collector of the triode Q1 is grounded, the other end of the resistor R9 is connected to the first pump light source 1, one end of the resistor R10 is connected to the resistor R9, the other end of the resistor R10 is connected to the resistor R5, and one end of the resistor R7 is connected to the resistor R5 is connected, the other end of resistor R7 is connected to resistor R6, one end of resistor R8 is connected to resistor R6, and the other end of resistor R8 is connected to resistor R9, wherein resistor R10 is the feedback resistor of operational amplifier U2A, and resistor R7 is the feedback resistor of operational amplifier U1A , Resistor R9 and resistor R8 together constitute the feedback resistor of operational amplifier U2A and operational amplifier U1A. Referring to FIG. 3B, a resistor R11 is connected between the second analog control voltage signal output by the D/A conversion circuit and the piezoelectric ceramic drive circuit U6, and the other end of the resistor R11 is connected to the inverting input terminal 2 of the operational amplifier U1B. The output terminal 1 of the operational amplifier U1B is connected to the resistor R12, the other terminal of the resistor R12 is connected to the inverting input terminal 2 of the operational amplifier U2B, the output terminal 1 of the operational amplifier U2B is connected to the base of the transistor Q2, and the emitter of the transistor Q2 is connected to the resistor R15 is connected, the collector of the transistor Q2 is grounded, the other end of the resistor R15 is connected to the second pumping light source 11, one end of the resistor R16 is connected to the resistor R15, the other end of the resistor R16 is connected to the resistor R12, one end of the resistor R13 is connected to the resistor R12, and the resistor R16 is connected to the resistor R12. The other end of R13 is connected to resistor R11, one end of resistor R14 is connected to resistor R11, and the other end of resistor R14 is connected to resistor R15, wherein resistor R16 is the feedback resistor of operational amplifier U2B, resistor R13 is the feedback resistor of operational amplifier U1B, resistors R15 and Resistor R14 together constitutes the feedback resistor of operational amplifier U2B and operational amplifier U1B. The constant current source circuit adopts an integrated operational amplifier and a three-stage tube to form a broadband voltage-controlled constant current source, and the light source core temperature control circuit uses a bridge composed of thermistors to control the light source core temperature.

在本发明中,光路的传输为:第一泵浦光源1输出泵浦光通过第一波分复用器2进入第一掺铒光纤3中,以及第二泵浦光源11输出泵浦光通过第二波分复用器12进入第一掺铒光纤3中;在第一掺铒光纤3吸收泵浦光产生的荧光并沿着逆时针方向和顺时针方向传播;顺时针方向传播的荧光经过偏振控制器4之后进入第一光纤环形器5的A端;逆时针方向传播的荧光经第二波分复用器12之后进入第一光纤环形器5的B端,经B端进入的荧光被损耗在第一光纤环形器5中;由第一光纤环形器5的C端输出的荧光通过第二掺铒光纤6后进入布拉格光栅7中,在光纤布拉格光栅7中的部分光经反射后输出反射光,反射光再通过第二掺铒光纤6进入第一光纤环形器5中;在布拉格光栅7中的部分光经透射后输出透射光给耦合器8,经耦合器8耦合后输出单频可调谐激光束。In the present invention, the transmission of the optical path is: the output pump light of the first pump light source 1 enters the first erbium-doped optical fiber 3 through the first wavelength division multiplexer 2, and the output pump light of the second pump light source 11 passes through The second wavelength division multiplexer 12 enters in the first erbium-doped optical fiber 3; absorbs the fluorescence produced by the pump light at the first erbium-doped optical fiber 3 and propagates along the counterclockwise direction and the clockwise direction; the fluorescence propagated in the clockwise direction is polarized After the controller 4 enters the A end of the first optical fiber circulator 5; the fluorescence propagating in the counterclockwise direction enters the B end of the first optical fiber circulator 5 after passing through the second wavelength division multiplexer 12, and the fluorescence entering through the B end is lost In the first optical fiber circulator 5; the fluorescence output by the C end of the first optical fiber circulator 5 enters in the Bragg grating 7 after passing through the second erbium-doped optical fiber 6, and the part light in the optical fiber Bragg grating 7 is output after reflection Light, the reflected light enters in the first optical fiber circulator 5 through the second erbium-doped optical fiber 6 again; After the part light in the Bragg grating 7 is transmitted, the output transmission light is given to the coupler 8, and the single-frequency can be output after the coupler 8 is coupled. Tuning the laser beam.

本发明单频光纤激光器的闭环稳频及调谐方案的主要内容如下:The main contents of the closed-loop frequency stabilization and tuning scheme of the single-frequency fiber laser of the present invention are as follows:

1)所设计的光纤激光器采用两个PZT(即第一压电陶瓷16、第二压电陶瓷17)来进行激光模式/波长的稳频和频率调谐;采用PZT作为调谐单频光纤激光器频率的技术。这种方法具有简单可靠的特点,采用合理的结构可以使响应速度达到部分应用领域频率跟踪的要求,又能保证其在所使用的温度、振动环境中保持坚固性。1) The designed fiber laser uses two PZTs (i.e. the first piezoelectric ceramic 16 and the second piezoelectric ceramic 17) to perform frequency stabilization and frequency tuning of the laser mode/wavelength; PZT is used as the frequency tuning of the single-frequency fiber laser technology. This method has the characteristics of simplicity and reliability. With a reasonable structure, the response speed can meet the requirements of frequency tracking in some application fields, and it can also ensure its robustness in the temperature and vibration environment used.

2)抽取5%(分光比5∶95)激光经环行器10后进入布里渊散射腔14中,其反射的Stokes光经光探测器13接收后成为RF信号,与一本征微波信号f0进行混频,其差频信号(f-f0)输出给信号处理电路19的片内A/D上,经片内A/D转换为数字量信号后,所述数字量信号经信号处理电路19的片内程序作负反馈处理后,输出控制量给压电陶瓷驱动电路18,压电陶瓷驱动电路18输出两路驱动信号(第一路驱动信号、第二路驱动信号)用来驱动PZT以控制光纤激光器的谐振腔;2) Extract 5% (split ratio 5:95) laser light into the Brillouin scattering cavity 14 after passing through the circulator 10, and the reflected Stokes light becomes an RF signal after being received by the photodetector 13, which is related to the intrinsic microwave signal f 0 for frequency mixing, the difference frequency signal (ff 0 ) is output to the on-chip A/D of the signal processing circuit 19, after being converted into a digital signal by the on-chip A/D, the digital signal is passed through the signal processing circuit 19 After the on-chip program is processed by negative feedback, the output control quantity is given to the piezoelectric ceramic drive circuit 18, and the piezoelectric ceramic drive circuit 18 outputs two road drive signals (the first road drive signal and the second road drive signal) to drive the PZT to Controlling the resonator of the fiber laser;

3)Stokes反射光的频率信号f随光纤激光器产生的波长信号而变化,因此在激光模式发生跳变时就偏离了与原设定波长相对应的Stokes频率f0,经微波混频后就可以得到一差频分量(f-f0),而Stokes频率f0为所需光纤激光器激射光频率相对应的微波频率,可以由一固定频率的微波信号作为,即本征微波信号f03) The frequency signal f of the Stokes reflected light changes with the wavelength signal generated by the fiber laser, so when the laser mode jumps, it deviates from the Stokes frequency f 0 corresponding to the original set wavelength, which can be achieved after microwave mixing Obtain a difference frequency component (ff 0 ), and the Stokes frequency f 0 is the microwave frequency corresponding to the lasing light frequency of the required fiber laser, which can be used as a microwave signal of a fixed frequency, that is, the intrinsic microwave signal f 0 ;

4)经过PZT的反馈控制光纤激光器的腔长,使得光纤模式跳变得到抑制。整个光纤激光器组成了闭环控制系统,可以保障光纤激光器系统长时间(经测试,使用时间可度达10万小时以上)稳定单频工作,改变本征微波信号f0,即可通过闭环结构获得对光纤激光器的频率调谐。4) The cavity length of the fiber laser is controlled by the feedback of the PZT, so that the fiber mode hopping is suppressed. The entire fiber laser constitutes a closed-loop control system, which can ensure the stable single-frequency operation of the fiber laser system for a long time (after testing, the service time can reach more than 100,000 hours). Frequency tuning of fiber lasers.

在本发明中,采用高浓度高掺杂铒镱共掺有源光纤应用于单频可调谐掺铒光纤激光器的系统中,作为增益介质的掺稀土元素光纤是超窄线宽光纤激光器最为核心的部件之一。传统的掺铒石英光纤的单位增益由于受到铒离子的浓度淬灭的限制而较低。掺铒碲酸盐玻璃虽然具有较宽的荧光发射带宽和较高的受激发射截面,但较差的玻璃热稳定性、严重的上转换现象和昂贵的价格限制了其应用。磷酸盐玻璃,特别是氟磷酸盐玻璃,具有较好的化学稳定性和热稳定性、较低的声子能量、较宽的红外透过性能和大的非均匀展宽特性,使其成为很有前景的实现宽带高增益放大掺铒玻璃的理想介质材料。在980nm泵浦光抽运条件下,由于Yb3+离子在波长为980nm的区域具有远大于Er3+离子的吸收截面,通过Yb3+的敏化作用可以大大提高抽运效率。通过研究新型的高浓度铒镱共掺光纤的参数(掺杂浓度、纤芯直径、数值孔径、长度等)、泵浦方式(前向泵浦、后向泵浦、双向泵浦及其复合泵浦)、光纤耦合及其长度、泵浦功率、反射腔反射率、输出耦合比等对超窄线宽光纤激光器的阈值功率、输出功率及激光线宽等性能的影响,寻找合适的上述参数,设计单频可调谐掺铒光纤激光器有源增益区的合理结构。In the present invention, high-concentration and high-doped erbium-ytterbium co-doped active fibers are used in the system of single-frequency tunable erbium-doped fiber lasers, and the rare-earth-doped fiber as the gain medium is the core of ultra-narrow linewidth fiber lasers One of the components. The unity gain of conventional erbium-doped silica fibers is low due to the limitation of concentration quenching of erbium ions. Although erbium-doped tellurite glass has a wide fluorescence emission bandwidth and a high stimulated emission cross section, its poor thermal stability, severe up-conversion phenomenon and high price limit its application. Phosphate glass, especially fluorophosphate glass, has good chemical stability and thermal stability, low phonon energy, wide infrared transmission performance and large non-uniform broadening characteristics, making it a very Promising ideal dielectric material for broadband high-gain amplification Erbium-doped glass. Under the pumping conditions of 980nm pump light, since Yb3+ ions have a much larger absorption cross section than Er3+ ions in the wavelength region of 980nm, the pumping efficiency can be greatly improved through the sensitization of Yb3+. By studying the parameters (doping concentration, core diameter, numerical aperture, length, etc.) and pumping methods (forward pumping, backward pumping, bidirectional pumping and their composite pumping) pump), fiber coupling and its length, pump power, reflectivity of the reflective cavity, output coupling ratio, etc., on the threshold power, output power and laser linewidth of the ultra-narrow linewidth fiber laser, and find the appropriate parameters above. Rational structure for designing the active gain region of single-frequency tunable Erbium-doped fiber lasers.

单频可调谐掺铒光纤激光器还具有光纤输出,使用灵活,可以在恶劣的环境下工作等优异的特点,适用于高端测试、传感器、科学研究等领域。主要军事应用背景有:谐振型光纤陀螺、微光机电(MOEMS)陀螺、高精度分布式光纤水听器、激光指示和军事测距、光纤声音、震动传感系统、相干式成像激光雷达、光频域反射计、卫星间相干激光通信等。The single-frequency tunable erbium-doped fiber laser also has excellent features such as fiber output, flexible use, and can work in harsh environments. It is suitable for high-end testing, sensors, scientific research and other fields. The main military application backgrounds are: resonant fiber optic gyroscope, micro-optical electromechanical (MOEMS) gyroscope, high-precision distributed fiber optic hydrophone, laser indication and military ranging, fiber optic sound, vibration sensing system, coherent imaging laser radar, light Frequency domain reflectometer, inter-satellite coherent laser communication, etc.

Claims (5)

1、一种单频可调谐掺铒光纤激光器系统,其特征在于:由第一泵浦光源(1)、第二泵浦光源(11)、第一波分复用器(2)、第二波分复用器(12)、第一掺铒光纤(3)、第二掺铒光纤(6)、偏振控制器(4)、第一光纤环形器(5)、第二光纤环形器(10)、光纤布拉格光栅(7)、耦合器(8)、光探测器(13)、布里渊散射腔(14)、混频器(15)、第一压电陶瓷(16)、第二压电陶瓷(17)、压电陶瓷驱动电路(18)、信号处理电路(19)、第一泵浦光源驱动电路(21)、第二泵浦光源驱动电路(22)组成;1. A single-frequency tunable erbium-doped fiber laser system is characterized in that: by the first pump light source (1), the second pump light source (11), the first wavelength division multiplexer (2), the second Wavelength division multiplexer (12), first erbium-doped optical fiber (3), second erbium-doped optical fiber (6), polarization controller (4), first optical fiber circulator (5), second optical fiber circulator (10 ), fiber Bragg grating (7), coupler (8), photodetector (13), Brillouin scattering cavity (14), mixer (15), first piezoelectric ceramic (16), second piezoelectric ceramic Composed of an electric ceramic (17), a piezoelectric ceramic drive circuit (18), a signal processing circuit (19), a first pump light source drive circuit (21), and a second pump light source drive circuit (22); 第一泵浦光源(1)与第一波分复用器(2)的A端之间连接有光纤,第一波分复用器(2)的C端与偏振控制器(4)的入纤熔接,第一波分复用器(2)的B端与第一掺铒光纤(3)熔接;第二泵浦光源(11)与第二波分复用器(12)的A端之间连接有光纤,第二波分复用器(12)的C端与第一光纤环形器(5)的B端熔接,第二波分复用器(12)的B端与第一掺铒光纤(3)熔接;偏振控制器(4)的尾纤与第一光纤环形器(5)的A端熔接,第一光纤环形器(5)的C端与第二掺铒光纤(6)的一端熔接,第二掺铒光纤(6)另一端与光纤布拉格光栅(7)的一端熔接;光纤布拉格光栅(7)的另一端与第一耦合器(8)的A端之间连接有光纤,第一耦合器(8)的B端与第二光纤环形器(10)的A端之间连接有光纤,第二光纤环形器(10)的B端与光探测器(13)之间连接有光纤,第二光纤环形器(10)的C端与布里渊散射腔(14)的输出端之间连接有光纤;第一耦合器(8)的C端输出单频可调谐激光束;光探测器(13)与混频器(15)之间连接有光纤;第二掺铒光纤(6)与第一压电陶瓷(16)之间连接有光纤,光纤布拉格光栅(7)与第二压电陶瓷(17)之间连接有光纤;An optical fiber is connected between the first pump light source (1) and the A end of the first wavelength division multiplexer (2), and the C end of the first wavelength division multiplexer (2) is connected to the input of the polarization controller (4). fiber fusion, the B end of the first wavelength division multiplexer (2) is welded with the first erbium-doped optical fiber (3); the second pumping light source (11) and the A end of the second wavelength division multiplexer (12) Optical fiber is connected between them, the C end of the second wavelength division multiplexer (12) is fused with the B end of the first optical fiber circulator (5), and the B end of the second wavelength division multiplexer (12) is connected with the first erbium-doped The optical fiber (3) is fused; the tail fiber of the polarization controller (4) is fused with the A end of the first optical fiber circulator (5), and the C end of the first optical fiber circulator (5) is connected with the second erbium-doped optical fiber (6). One end is fused, and the second erbium-doped optical fiber (6) other end is fused with an end of the fiber Bragg grating (7); an optical fiber is connected between the other end of the fiber Bragg grating (7) and the A end of the first coupler (8), An optical fiber is connected between the B end of the first coupler (8) and the A end of the second optical fiber circulator (10), and an optical fiber is connected between the B end of the second optical fiber circulator (10) and the photodetector (13). An optical fiber, an optical fiber is connected between the C end of the second optical fiber circulator (10) and the output end of the Brillouin scattering cavity (14); the C end of the first coupler (8) outputs a single-frequency tunable laser beam; An optical fiber is connected between the detector (13) and the mixer (15); an optical fiber is connected between the second erbium-doped optical fiber (6) and the first piezoelectric ceramic (16), and the fiber Bragg grating (7) and the second An optical fiber is connected between the piezoelectric ceramics (17); 信号处理电路(19)与第一泵浦光源驱动电路(21)、第二泵浦光源驱动电路(22)、压电陶瓷驱动电路(18)采用电信号联接,压电陶瓷驱动电路(18)输出第一驱动信号给第一压电陶瓷(16),压电陶瓷驱动电路(18)输出第二驱动信号给第二压电陶瓷(17)。The signal processing circuit (19) is connected with the first pumping light source driving circuit (21), the second pumping light source driving circuit (22), and the piezoelectric ceramic driving circuit (18) by electrical signals, and the piezoelectric ceramic driving circuit (18) The first driving signal is output to the first piezoelectric ceramic (16), and the piezoelectric ceramic driving circuit (18) outputs the second driving signal to the second piezoelectric ceramic (17). 2、根据权利要求1所述的单频可调谐掺铒光纤激光器系统,其特征在于:耦合器(8)、第二光纤环形器(10)、光探测器(13)、布里渊散射腔(14)、混频器(15)、第一压电陶瓷(16)、第二压电陶瓷(17)、压电陶瓷驱动电路(18)形成一个闭环稳频及纵模锁定。2. The single-frequency tunable erbium-doped fiber laser system according to claim 1, characterized in that: coupler (8), second fiber circulator (10), optical detector (13), Brillouin scattering cavity (14), the mixer (15), the first piezoelectric ceramic (16), the second piezoelectric ceramic (17), and the piezoelectric ceramic driving circuit (18) form a closed-loop frequency stabilization and longitudinal mode locking. 3、根据权利要求1所述的单频可调谐掺铒光纤激光器系统,其特征在于:第一波分复用器(2)、第二波分复用器(12)、第一掺铒光纤(3)、第二掺铒光纤(6)、偏振控制器(4)、第一光纤环形器(5)和光纤布拉格光栅(7)构成一个环形谐振腔。3. The single-frequency tunable erbium-doped fiber laser system according to claim 1, characterized in that: the first wavelength division multiplexer (2), the second wavelength division multiplexer (12), the first erbium-doped fiber (3), the second erbium-doped optical fiber (6), the polarization controller (4), the first optical fiber circulator (5) and the fiber Bragg grating (7) form a ring resonant cavity. 4、根据权利要求1所述的单频可调谐掺铒光纤激光器系统,其特征在于:第一波分复用器(2)和第二波分复用器(12)选取两波长波分复用器;信号处理电路(19)选取DSP处理器TMS320F系列。4. The single-frequency tunable erbium-doped fiber laser system according to claim 1, characterized in that: the first wavelength division multiplexer (2) and the second wavelength division multiplexer (12) select two-wavelength wavelength division multiplexer Use device; Signal processing circuit (19) selects DSP processor TMS320F series. 5、根据权利要求1所述的单频可调谐掺铒光纤激光器系统,其特征在于:信号处理电路U1的25、34、40、92、93端分别与压电陶瓷驱动电路U6的16、18、19、22、23端联接,信号处理电路U1的174端与混频器15的输出信号端联接;压电陶瓷驱动电路U6的13端与第二泵浦光源驱动电路U1B的2端联接,压电陶瓷驱动电路U6的14端与第一泵浦光源驱动电路U1A的2端联接,压电陶瓷驱动电路U6的10端经电阻R1后与第二压电陶瓷17的运算放大器U8的2端联接,压电陶瓷驱动电路U6的12端经电阻R2后与第一压电陶瓷16的运算放大器U7的2端联接;运算放大器U8的2端与6端串联有电阻R3,3端接地,4端接-12V电压,地与4端之间接有电容C11,7端接+12V电压,地与7端之间接有电容C10,6端与第二压电陶瓷17联接;运算放大器U7的2端与6端串联有电阻R4,3端接地,4端接-12V电压,地与4端之间接有电容C9,7端接+12V电压,地与7端之间接有电容C8,6端与第一压电陶瓷16联接;D/A转换电路输出的第一路模拟控制电压信号与压电陶瓷驱动电路U6之间联接有电阻R6,电阻R6另一端与运算放大器U1A的反相输入端2联接,运算放大器U1A的输出端1与电阻R5联接,电阻R5另一端与运算放大器U2A的反相输入端2联接,运算放大器U2A的输出端1与三极管Q1的基极联接,三极管Q1的发射极与电阻R9联接,三极管Q1的集电极接地,电阻R9的另一端与第一泵浦光源1相连,电阻R10一端与电阻R9联接,电阻R10另一端与电阻R5联接,电阻R7一端与电阻R5联接,电阻R7另一端与电阻R6联接,电阻R8一端与电阻R6联接,电阻R8另一端与电阻R9联接,其中,电阻R10为运算放大器U2A的反馈电阻,电阻R7为运算放大器U1A的反馈电阻,电阻R9和电阻R8共同构成运算放大器U2A和运算放大器U1A的反馈电阻;D/A转换电路输出的第二路模拟控制电压信号与压电陶瓷驱动电路U6之间联接有电阻R11,电阻R11另一端与运算放大器U1B的反相输入端2联接,运算放大器U1B的输出端1与电阻R12联接,电阻R12另一端与运算放大器U2B的反相输入端2联接,运算放大器U2B的输出端1与三极管Q2的基极联接,三极管Q2的发射极与电阻R15联接,三极管Q2的集电极接地,电阻R15的另一端与第二泵浦光源11相连,电阻R16一端与电阻R15联接,电阻R16另一端与电阻R12联接,电阻R13一端与电阻R12联接,电阻R13另一端与电阻R11联接,电阻R14一端与电阻R11联接,电阻R14另一端与电阻R15联接,其中,电阻R16为运算放大器U2B的反馈电阻,电阻R13为运算放大器U1B的反馈电阻,电阻R15和电阻R14共同构成运算放大器U2B和运算放大器U1B的反馈电阻。5. The single-frequency tunable erbium-doped fiber laser system according to claim 1, characterized in that: terminals 25, 34, 40, 92, and 93 of the signal processing circuit U1 are respectively connected to terminals 16 and 18 of the piezoelectric ceramic drive circuit U6 , 19, 22, and 23 terminals are connected, and 174 terminals of the signal processing circuit U1 are connected with the output signal terminal of the mixer 15; 13 terminals of the piezoelectric ceramic driving circuit U6 are connected with 2 terminals of the second pumping light source driving circuit U1B, Terminal 14 of the piezoelectric ceramic driving circuit U6 is connected to terminal 2 of the first pump light source driving circuit U1A, and terminal 10 of the piezoelectric ceramic driving circuit U6 is connected to terminal 2 of the operational amplifier U8 of the second piezoelectric ceramic 17 through a resistor R1 connection, the 12 ends of the piezoelectric ceramic driving circuit U6 are connected with the 2 ends of the operational amplifier U7 of the first piezoelectric ceramic 16 through the resistor R2; The terminal is connected with -12V voltage, the capacitor C11 is connected between the ground and the 4th terminal, the 7th terminal is connected with +12V voltage, the capacitor C10 is connected between the ground and the 7th terminal, the 6th terminal is connected with the second piezoelectric ceramic 17; the 2nd terminal of the operational amplifier U7 A resistor R4 is connected in series with terminal 6, terminal 3 is grounded, terminal 4 is connected to -12V voltage, a capacitor C9 is connected between the ground and terminal 4, terminal 7 is connected to +12V voltage, a capacitor C8 is connected between the ground and terminal 7, terminal 6 is connected to the first A piezoelectric ceramic 16 connection; a resistor R6 is connected between the first analog control voltage signal output by the D/A conversion circuit and the piezoelectric ceramic drive circuit U6, and the other end of the resistor R6 is connected to the inverting input terminal 2 of the operational amplifier U1A The output terminal 1 of the operational amplifier U1A is connected to the resistor R5, the other terminal of the resistor R5 is connected to the inverting input terminal 2 of the operational amplifier U2A, the output terminal 1 of the operational amplifier U2A is connected to the base of the transistor Q1, and the emitter of the transistor Q1 is connected to the base of the transistor Q1. The resistor R9 is connected, the collector of the transistor Q1 is grounded, the other end of the resistor R9 is connected to the first pump light source 1, one end of the resistor R10 is connected to the resistor R9, the other end of the resistor R10 is connected to the resistor R5, and one end of the resistor R7 is connected to the resistor R5. The other end of resistor R7 is connected to resistor R6, one end of resistor R8 is connected to resistor R6, and the other end of resistor R8 is connected to resistor R9, wherein resistor R10 is the feedback resistor of operational amplifier U2A, resistor R7 is the feedback resistor of operational amplifier U1A, and resistor R9 Together with the resistor R8, the feedback resistor of the operational amplifier U2A and the operational amplifier U1A is formed; the second analog control voltage signal output by the D/A conversion circuit and the piezoelectric ceramic drive circuit U6 are connected with a resistor R11, and the other end of the resistor R11 is connected to the operational amplifier. The inverting input terminal 2 of the amplifier U1B is connected, the output terminal 1 of the operational amplifier U1B is connected with the resistor R12, the other end of the resistor R12 is connected with the inverting input terminal 2 of the operational amplifier U2B, the output terminal 1 of the operational amplifier U2B is connected to the base of the transistor Q2 The emitter of the transistor Q2 is connected to the resistor R15, the collector of the transistor Q2 is grounded, the other end of the resistor R15 is connected to the second pump light source 11, one end of the resistor R16 is connected to the resistor R15, and the other end of the resistor R16 is connected to the resistor R12 , one end of the resistor R13 is connected to the resistor R12, the other end of the resistor R13 is connected to the resistor R11, one end of the resistor R14 is connected to the resistor R11, and the other end of the resistor R14 is connected to the resistor R15, wherein the resistor R16 is the feedback resistor of the operational amplifier U2B, and the resistor R13 is The feedback resistor of operational amplifier U1B, resistor R15 and resistor R14 together form the feedback resistors of operational amplifier U2B and operational amplifier U1B.
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