技术领域technical field
本发明属于光电子技术领域，更具体说是一种激光脉冲压缩与展宽系统。The invention belongs to the technical field of optoelectronics, and more specifically relates to a laser pulse compression and stretching system.
背景技术Background technique
近年来，激光科学技术中的一个最引人注目的成就是超短激光脉冲技术的迅猛发展。它的广泛应用，直接带动了物理、化学、生物、材料与信息科学的研究进入微观超快过程领域，并开创了一些全新的研究领域，例如飞秒化学、量子控制化学、半导体相干光谱等。由于存在色散效应，激光脉冲在光纤传输中会发生畸变失真，使得激光脉冲的宽度变宽，从而产生码间干扰、增加了误码率。在光纤链路中加入具有负色散系数的传输介质，可以补偿光纤色散对激光信号产生的不利效应。反过来，充分利用色散特性，也可以对激光脉冲进行压缩与展宽处理，可见色散对压缩与展宽激光脉冲起着至关重要的作用。目前，由于受限于工艺等因素，色散介质如色散光纤、啁啾布拉格光栅等色散系数只能达到千或百ps/nm/km量级，这大大限制了对激光脉冲的压缩与展宽作用。In recent years, one of the most striking achievements in laser science and technology is the rapid development of ultrashort laser pulse technology. Its wide application has directly driven the research of physics, chemistry, biology, materials and information science into the field of microscopic ultrafast processes, and created some new research fields, such as femtosecond chemistry, quantum control chemistry, semiconductor coherence spectroscopy, etc. Due to the dispersion effect, the laser pulse will be distorted and distorted during optical fiber transmission, which will widen the width of the laser pulse, resulting in intersymbol interference and increasing the bit error rate. Adding a transmission medium with a negative dispersion coefficient to the fiber link can compensate for the adverse effect of fiber dispersion on the laser signal. Conversely, by making full use of the dispersion characteristics, the laser pulse can also be compressed and stretched. It can be seen that dispersion plays a vital role in compressing and stretching the laser pulse. At present, due to the limitation of technology and other factors, the dispersion coefficient of dispersive media such as dispersive fiber and chirped Bragg grating can only reach the order of thousands or hundreds of ps/nm/km, which greatly limits the compression and broadening of laser pulses.
发明内容Contents of the invention
有鉴于此，本发明的目的在于，提供一种激光脉冲压缩与展宽系统，以突破传统色散介质色散系数不够大的限制。In view of this, the object of the present invention is to provide a laser pulse compression and stretching system to break through the limitation that the dispersion coefficient of the traditional dispersion medium is not large enough.
本发明提出一种激光脉冲压缩与展宽系统，其特征在于，包括：The present invention proposes a laser pulse compression and stretching system, which is characterized in that it includes:
一光开关，该光开关具有一个输入端口a和两个输出端口b、c以及一个控制端口；An optical switch, the optical switch has an input port a, two output ports b, c and a control port;
一光放大器，该光放大器的输入端与光开关的输出端口b相连接；An optical amplifier, the input end of the optical amplifier is connected to the output port b of the optical switch;
一色散介质，该色散介质的一端与光放大器的输出端相连接；a dispersive medium, one end of the dispersive medium is connected to the output end of the optical amplifier;
一延时光纤，该延时光纤的一端与色散介质的另一端相连接；A time-delay fiber, one end of the time-delay fiber is connected to the other end of the dispersion medium;
一光耦合器，该光耦合器的一输入端与延时光纤的另一端相连接，该光耦合器的输出端与光开关的输入端口a相连接；An optical coupler, an input end of the optical coupler is connected to the other end of the delay fiber, and an output end of the optical coupler is connected to the input port a of the optical switch;
一开关控制器，该开关控制器的控制端口与光开关的控制端口相连接。A switch controller, the control port of the switch controller is connected with the control port of the optical switch.
本发明一种激光脉冲压缩与展宽系统，通过光开关控制，将输入的激光脉冲在具有色散介质的环内反复循环放大，因而得到多次色散，从而突破了传统色散介质色散系数不够大的限制。该系统具有大小可控的色散系数，能够实现对激光脉冲的超窄压缩与超宽展宽。A laser pulse compression and stretching system of the present invention, through optical switch control, the input laser pulse is amplified repeatedly in a ring with a dispersive medium, thus obtaining multiple dispersions, thereby breaking through the limitation that the dispersion coefficient of the traditional dispersive medium is not large enough . The system has a controllable dispersion coefficient and can realize ultra-narrow compression and ultra-wide expansion of laser pulses.
附图说明Description of drawings
为进一步说明本发明的技术内容，以下结合附图和实施例对本发明作进一步说明，其中：In order to further illustrate the technical content of the present invention, the present invention will be further described below in conjunction with accompanying drawing and embodiment, wherein:
图1是本发明一种激光脉冲压缩与展宽系统的结构示意图。Fig. 1 is a schematic structural diagram of a laser pulse compression and stretching system of the present invention.
具体实施方式Detailed ways
为使本发明的目的、技术方案和优点更加清楚明白，以下结合具体实施例，并参照附图，对本发明进一步详细说明。需要说明的是，在附图或说明书描述中，相似或相同的部分都使用相同的图号。附图中未绘示或描述的实现方式，为所属技术领域中普通技术人员所知的形式。另外，虽然本文可提供包含特定值的参数的示范，但应了解，参数无需确切等于相应的值，而是可在可接受的误差容限或设计约束内近似于相应的值。In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with specific embodiments and with reference to the accompanying drawings. It should be noted that, in the drawings or descriptions of the specification, similar or identical parts all use the same figure numbers. Implementations not shown or described in the accompanying drawings are forms known to those of ordinary skill in the art. Additionally, while illustrations of parameters including particular values may be provided herein, it should be understood that the parameters need not be exactly equal to the corresponding values, but rather may approximate the corresponding values within acceptable error margins or design constraints.
本发明提供了一种激光脉冲压缩与展宽系统。该系统是利用开关控制器对光开关的输出端口进行切换，使得输入的激光脉冲在光开关、光放大器、色散介质与延时光纤构成的环中多次循环、多次放大、多次色散，从而实现了对激光脉冲的超窄压缩与超宽展宽。The invention provides a laser pulse compression and expansion system. The system uses the switch controller to switch the output port of the optical switch, so that the input laser pulse circulates, amplifies and disperses multiple times in the ring formed by the optical switch, optical amplifier, dispersion medium and delay fiber. Thus, ultra-narrow compression and ultra-wide expansion of laser pulses are realized.
在本发明的一个示例性实施例中，提供了一种激光脉冲压缩与展宽系统。请参照图1，该系统包括：In an exemplary embodiment of the present invention, a laser pulse compression and stretching system is provided. Please refer to Figure 1, the system includes:
一光开关1，该光开关1具有一个输入端口a和两个输出端口b、c以及一个控制端口；An optical switch 1, the optical switch 1 has an input port a, two output ports b, c and a control port;
一光放大器2，该光放大器2的输入端与光开关1的输出端口b相连接；An optical amplifier 2, the input end of the optical amplifier 2 is connected to the output port b of the optical switch 1;
一色散介质3，该色散介质3的一端与光放大器2的输出端相连接；A dispersion medium 3, one end of the dispersion medium 3 is connected to the output end of the optical amplifier 2;
一延时光纤4，该延时光纤4的一端与色散介质3的另一端相连接；A delay fiber 4, one end of the delay fiber 4 is connected to the other end of the dispersion medium 3;
一光耦合器5，该光耦合器5的一输入端与延时光纤4的另一端相连接，该光耦合器5的输出端与光开关的输入端a相连接；An optical coupler 5, an input end of the optical coupler 5 is connected with the other end of the delay fiber 4, and an output end of the optical coupler 5 is connected with the input end a of the optical switch;
一开关控制器6，该开关控制器6的控制端口与光开关1的控制端口相连接。A switch controller 6 , the control port of the switch controller 6 is connected with the control port of the optical switch 1 .
其中光开关1、光放大器2、色散介质3、延时光纤4、光耦合器5之间是通过标准单模光纤相连接。Among them, the optical switch 1, the optical amplifier 2, the dispersion medium 3, the delay optical fiber 4, and the optical coupler 5 are connected through a standard single-mode optical fiber.
其中光开关1与开关控制器6之间是通过标准射频连接线相连接。The optical switch 1 and the switch controller 6 are connected through a standard radio frequency connection line.
本发明一种激光脉冲压缩与展宽系统的原理如下：The principle of a laser pulse compression and stretching system of the present invention is as follows:
一激光脉冲通过光耦合器5输出到光开关1的输入端a，此时开关控制器6输出的控制信号为低电平信号，使得光开关1的开关状态为a到b。其中，开关控制器6输出的控制信号与输入的激光脉冲应时钟同步。激光脉冲从光开关b输出端进入光放大器2进行功率放大，然后进入色散介质3中。当采用的色散介质3的色散系数为正值时，本发明系统对激光脉冲起到展宽的作用；当采用的色散介质3的色散系数为负值时，本发明系统对激光脉冲起到压缩的作用。其中色散介质3可以是色散光纤或是啁啾布拉格光栅，其带宽应大于输入的激光脉冲的带宽。被压缩/展宽的激光脉冲进入到延时光纤4中进行延时后通过光耦合器5再次达到光开关1的输入端a。若此时开关控制器6输出的控制信号仍为低电平信号，激光脉冲将从光开关1的b输出端输出并再次进入色散介质3中进行压缩/展宽，如此周而复始。当经过多次压缩/展宽的激光脉冲进入到光开关1的输入端a时，若此时开关控制器6输出的控制信号为高电平信号，光开关1的开关状态转为a到c，从而将经过多次压缩/展宽的激光脉冲从光开关1的c端口输出。其中，延时光纤4对激光脉冲的延时时间应远大于光开关1的开光状态切换时间，光放大器2对激光脉冲的增益应大于整个系统对激光脉冲的损耗。A laser pulse is output to the input terminal a of the optical switch 1 through the optical coupler 5, and the control signal output by the switch controller 6 is a low-level signal at this time, so that the switching states of the optical switch 1 are a to b. Wherein, the control signal output by the switch controller 6 is clock-synchronized with the input laser pulse. The laser pulse enters the optical amplifier 2 from the output end of the optical switch b for power amplification, and then enters the dispersion medium 3 . When the dispersion coefficient of the dispersion medium 3 adopted is a positive value, the system of the present invention plays a role in broadening the laser pulse; when the dispersion coefficient of the dispersion medium 3 adopted is a negative value, the system of the present invention plays a role in compressing the laser pulse effect. The dispersion medium 3 may be a dispersion fiber or a chirped Bragg grating, and its bandwidth should be greater than that of the input laser pulse. The compressed/broadened laser pulse enters the delay fiber 4 for delay and then reaches the input end a of the optical switch 1 again through the optical coupler 5 . If the control signal output by the switch controller 6 is still a low-level signal at this time, the laser pulse will be output from the b output terminal of the optical switch 1 and enter the dispersion medium 3 again for compression/expansion, and so on. When the laser pulse that has been compressed/broadened multiple times enters the input terminal a of the optical switch 1, if the control signal output by the switch controller 6 is a high-level signal at this time, the switching state of the optical switch 1 changes from a to c, Thus, the laser pulses that have been compressed/stretched multiple times are output from the c port of the optical switch 1 . Wherein, the delay time of the delay fiber 4 for the laser pulse should be much longer than the switchover time of the optical switch 1, and the gain of the optical amplifier 2 for the laser pulse should be greater than the loss of the entire system for the laser pulse.
至此，已经结合附图对本发明一种激光脉冲压缩与展宽系统进行了详细描述。依据以上描述，本领域技术人员应当对本发明一种激光脉冲压缩与展宽系统有了清楚的认识。So far, a laser pulse compression and stretching system of the present invention has been described in detail with reference to the accompanying drawings. Based on the above description, those skilled in the art should have a clear understanding of the laser pulse compression and stretching system of the present invention.
此外，上述对各元件和方法的定义并不仅限于实施方式中提到的各种具体结构、形状或方式，本领域的普通技术人员可对其进行简单地熟知地替换。In addition, the above-mentioned definitions of each element and method are not limited to the various specific structures, shapes or methods mentioned in the embodiments, and those skilled in the art can easily and well-known replace them.
综上所述，本发明一种激光脉冲压缩与展宽系统，通过光开关控制，将输入的激光脉冲在具有色散介质的环内反复循环放大，因而得到多次色散，从而突破了传统色散介质色散系数不够大的限制。该系统具有大小可控的色散系数，能够实现对激光脉冲的超窄压缩与超宽展宽。In summary, the present invention is a laser pulse compression and stretching system, through the control of optical switches, the input laser pulse is repeatedly amplified in a ring with a dispersion medium, thus obtaining multiple dispersions, thereby breaking through the traditional dispersion medium dispersion The coefficient is not large enough to limit. The system has a controllable dispersion coefficient and can realize ultra-narrow compression and ultra-wide expansion of laser pulses.
以上所述的具体实施例，对本发明的目的、技术方案和有益效果进行了进一步详细说明，应理解的是，以上所述仅为本发明的具体实施例而已，并不用于限制本发明，凡在本发明的精神和原则之内，所做的任何修改、等同替换、改进等，均应包含在本发明的保护范围之内。The specific embodiments described above have further described the purpose, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above descriptions are only specific embodiments of the present invention, and are not intended to limit the present invention. Within the spirit and principles of the present invention, any modifications, equivalent replacements, improvements, etc., shall be included in the protection scope of the present invention.
| Application Number | Priority Date | Filing Date | Title |
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| CN201410814539.0ACN104614915B (en) | 2014-12-24 | 2014-12-24 | Laser pulse compression and broadening system |
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| CN201410814539.0ACN104614915B (en) | 2014-12-24 | 2014-12-24 | Laser pulse compression and broadening system |
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| CN201410814539.0AActiveCN104614915B (en) | 2014-12-24 | 2014-12-24 | Laser pulse compression and broadening system |
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