CN112713505B - Device and method for restraining chaotic laser delay characteristics by utilizing differential group delay - Google Patents
Device and method for restraining chaotic laser delay characteristics by utilizing differential group delay Download PDFInfo
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- CN112713505B CN112713505B CN202110129494.3A CN202110129494A CN112713505B CN 112713505 B CN112713505 B CN 112713505B CN 202110129494 A CN202110129494 A CN 202110129494A CN 112713505 B CN112713505 B CN 112713505B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
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Abstract
The invention discloses a device and a method for restraining chaotic laser delay characteristics by utilizing differential group delay, and relates to the field of chaotic laser application. The device includes semiconductor laser, and semiconductor laser passes through optical fiber and optical fiber coupler's light input port connection, optical fiber coupler's light delivery outlet divide into two light paths, and the beam split ratio of one of them light path is greater than another light path, and the light path that the beam split ratio is big passes through optic fibre and is connected with optical fiber attenuator, optical fiber attenuator passes through differential group delay characteristic component and is connected with the optical fiber reflector, optical fiber coupler beam split ratio little light path is chaotic laser's output light path. The invention adopts the few-mode fiber or the multimode fiber as the differential group delay characteristic element, utilizes the differential group delay characteristic among the modes of the few-mode fiber or the multimode fiber to form constant-strength and unequal-time multimode feedback on the semiconductor laser, and integrally weakens the delay characteristic of a fixed point, thereby realizing the inhibition, having simple structure and easy realization, and ensuring that the feedback strength of each mode is equal.
Description
Technical Field
The invention relates to the field of chaotic laser application, in particular to a device and a method for inhibiting chaotic laser delay characteristics by utilizing differential group delay.
Background
The chaotic laser is widely applied to the fields of physical random number generation, laser radar and time domain reflectometer, communication, sensing, information safety and the like by virtue of the characteristics of wide bandwidth, random oscillation, large amplitude and the like.
The chaotic laser generating mode comprises optical feedback, optical injection, photoelectric modulation and combination forms on the basis, wherein the mode with the simplest structure and the most widely used mode is the mode with the optical feedback semiconductor laser generating chaos, and the mode also becomes a basic structure considered when the chaotic semiconductor laser chip is integrated. However, the chaotic laser output by the optical feedback semiconductor laser carries information (i.e. delay characteristic) related to the feedback cavity length, the characteristic shows weak periodicity in a time domain, and a side lobe appears on an autocorrelation curve, which seriously affects the application of the chaotic laser in various fields, such as reduction of random characteristics of generated random numbers, easier cracking of secret communication, occurrence of an interference peak value during fault measurement, and the like. Therefore, a number of ways have been proposed by the broad scholars to try to suppress or eliminate the delay feature, such as: light injection is combined with light feedback form, dual cavity feedback, cavity length modulation feedback, polarization rotation feedback, continuous backward scatterer feedback, fiber grating feedback, and the like. Wherein dual cavity feedback uses two feedback links, whereby both delay characteristics may be made less noticeable by virtue of the feedback cavity growth in a relationship to weaken the experimental characteristics, but still have a distinct peak, just changing the two peaks to one (IEE proc. -optoelectronics, 152(2): 97-102, 2005); the cavity length modulation feedback needs to change the cavity length rapidly to solve the problem that the time delay characteristic cannot keep a fixed value, but the method needs extremely high cavity length switching speed and is difficult to realize; continuous backward scatterer feedback is realized by backward Rayleigh scattering of a highly doped optical fiber or waveguide, but the backward Rayleigh scattering is very weak, which means that very high power is required to be injected into the waveguide or optical fiber with very high doping concentration, and the feedback strength cannot be adjusted (patent, application number: 2017111402191); fiber grating feedback uses chirped fiber gratings or bragg gratings, and in the reflection attenuation delay characteristics using multiple gratings, the method is that the feedback intensity shows a decreasing trend at each grating according to the number of laser passing the grating, and is not equal intensity feedback (opt. Express, 25(10): 10911-. Therefore, in order to better apply the chaotic laser to various fields, researchers are required to continuously explore how to suppress or eliminate the chaotic laser delay characteristic.
Disclosure of Invention
In order to solve various problems of the method or the device for inhibiting the chaotic laser time delay characteristic, the invention provides a device and a method for inhibiting the chaotic laser time delay characteristic by utilizing differential group time delay.
The invention is realized by the following technical scheme: a device for suppressing chaotic laser delay characteristics by utilizing differential group delay comprises a semiconductor laser, an optical fiber coupler, an optical fiber attenuator and an optical fiber reflector, wherein all components are provided with optical fibers; semiconductor laser and fiber coupler are through the optical fiber connection from the area, and semiconductor laser is connected with fiber coupler's light input port promptly, fiber coupler's light delivery outlet divide into two light paths, and the beam split ratio of one of them light path is more than or equal to another light path, and the light path that the beam split ratio is big is connected through the optic fibre from the area with fiber attenuator, fiber attenuator passes through differential group delay characteristic component and is connected with the fiber reflector, the little light path of fiber coupler beam split ratio is chaos laser's output light path.
The device for restraining the chaotic laser delay characteristic by utilizing the differential group delay provided by the invention adopts the differential group delay characteristic element, utilizes the differential group delay characteristic thereof to form constant-strength and non-uniform multi-mode feedback on the semiconductor laser, and integrally weakens the delay characteristic of a fixed point of the position of the reflector, thereby realizing the restraint. The device comprises a semiconductor laser, an optical fiber coupler, an optical fiber attenuator, a differential group delay characteristic element and an optical fiber reflector, wherein each optical component is provided with an optical fiber, namely a tail fiber, the semiconductor laser is connected with the light input port of the optical fiber coupler through the optical fiber, the light output port of the optical fiber coupler is divided into two optical paths, the splitting ratio of one optical path is larger than or equal to that of the other optical path, the splitting ratio is not limited to a certain fixed value, only the splitting ratio of one optical path is larger than that of the other optical path, the optical path with the large splitting ratio is used as a feedback optical path, the optical path is connected with the optical fiber attenuator through the optical fiber provided with the optical fiber attenuator, the optical fiber attenuator is used for adjusting the optical feedback intensity, so that the semiconductor laser can better generate chaos, the optical fiber attenuator is connected with the optical fiber reflector through the differential group delay characteristic element, and the optical fiber reflector reflects light, the light returns along the original path to form an external cavity feedback light path, and the light path with small splitting ratio of the optical fiber coupler is the output light path of the chaotic laser. Due to the existence of the group delay function, the whole device can realize the equal-strength and unequal-time multi-mode feedback on the semiconductor laser through a single optical fiber, and further integrally weaken the delay characteristic of a fixed point at the mirror surface. The invention has the following specific operations: laser emitted by the semiconductor laser passes through the optical fiber coupler, a light output port of the optical fiber coupler is divided into two light paths, one light path with a large splitting ratio is used as a feedback light path, the feedback light path enters the differential group delay characteristic element after passing through the optical fiber attenuator, and then the feedback light path is reflected by the optical fiber reflector and returns to the semiconductor laser to be injected into the semiconductor laser, so that an external cavity feedback light path is formed, and the semiconductor laser generates chaos; and one light path with small splitting ratio output by the optical fiber coupler is used as an output light path of the chaotic laser.
Preferably, the optical fibers of all the components are single mode optical fibers, few mode optical fibers or multi-mode optical fibers, and if the optical fibers connected with each other are the same, the optical fibers are connected through a flange, and if the optical fibers connected with each other are different, the optical fibers are connected by adopting a fusion mode. Because optical fibers carried by a plurality of components may be different, the optical fibers may be the same or different, so that the same optical fibers and different optical fibers are fixedly connected, the same optical fibers and different optical fibers are connected by corresponding flanges, and the different optical fibers are connected by adopting a fusion welding mode.
Preferably, the coupling ratio of the optical fiber coupler adopts a ratio of 50:50, 60:40, 70:30, 80:20, 90:10 or 99: 1.
Preferably, the dgd element is a few-mode fiber or a multimode fiber, and the few-mode fiber or the multimode fiber is two of the dgd elements, and further, the length of the dgd element is greater than or equal to 30 m.
Compared with the prior art, the invention has the following beneficial effects: the device and the method for restraining the chaotic laser delay characteristic by utilizing the differential group delay have the advantages of simple structure, easy realization and equal feedback intensity of each mode. Compared with the various methods for inhibiting or eliminating the delay characteristics proposed in the background art, the method utilizes the differential group delay characteristic between the modes: different from the feedback of a plurality of optical fibers, the cavity length difference is small, the length of a plurality of paths of feedback optical fibers does not need to be controlled intentionally, and a single time delay characteristic can be weakened to a noise level continuously and at the same amplitude; the feedback is also different from the random feedback of the highly doped optical fiber, high-power injection is not needed, and the feedback strength is adjusted through a reflector and an attenuator, so that the operation is easy; the differential group delay characteristic element (few-mode fiber or multimode fiber) also has commercial products, and does not have special requirements on concentration unlike the highly doped fiber; unlike grating feedback, the feedback strength of each mode of the method provided by the invention is equal. The invention can make the chaotic laser be better applied to the fields of safe communication, key distribution, random number generation and the like.
Drawings
FIG. 1 is a schematic view of the structural connection of the present invention.
The figures are labeled as follows: the device comprises a 1-semiconductor laser, a 2-optical fiber coupler, a 3-optical fiber attenuator, a 4-differential group delay characteristic element and a 5-optical fiber reflector.
Detailed Description
The present invention is further illustrated by the following specific examples.
A device for suppressing the delay characteristic of chaotic laser by utilizing differential group delay, as shown in fig. 1: the optical fiber laser comprises a semiconductor laser 1, an optical fiber coupler 2, an optical fiber attenuator 3 and an optical fiber reflector 5, wherein all components are provided with optical fibers; semiconductor laser 1 and optical fiber coupler 2 are through the optical fiber connection from the area, and semiconductor laser 1 is connected with optical fiber coupler 2's light input port promptly, optical fiber coupler 2's light delivery outlet divide into two light paths, and the beam split ratio of one of them light path is more than or equal to another light path, and the light path that the beam split ratio is big is connected through the optical fiber from the area with optical fiber attenuator 3, optical fiber attenuator 3 is connected with optical fiber reflector 5 through difference group delay characteristic component 4, the output light path of optical fiber coupler 2 beam split ratio little light path for chaotic laser.
In the embodiment, a preferable scheme is adopted, and since the optical fibers carried by all the components are one or more of single-mode optical fibers, few-mode optical fibers or multi-mode optical fibers, if the optical fibers connected with one another are the same, the optical fibers are connected through a flange, and if the optical fibers connected with one another are different, the optical fibers are connected in a fusion mode; the coupling ratio of the optical fiber coupler 2 is 50:50, 60:40, 70:30, 80:20, 90:10 or 99:1, as long as one path with a large splitting ratio enters the optical fiber reflector 5 and forms feedback to make the semiconductor laser 1 generate chaos, so that the 99:1 optical fiber coupler is adopted in the embodiment, and the optical fiber attenuator 3 adjusts the optical feedback intensity; the differential group delay characteristic element 4 is a few-mode optical fiber or a multi-mode optical fiber; the length of the dgd element 4, i.e. the length of the few-mode fiber or the multimode fiber, is greater than or equal to 30m, and the length of the few-mode fiber is 35 m.
The embodiment specifically operates as follows: laser emitted by the semiconductor laser 1 passes through the optical fiber coupler 2, a light output port of the optical fiber coupler 2 is divided into two light paths, one light path with a large splitting ratio is used as a feedback light path, enters a few-mode optical fiber with the length of 35m after passing through the optical fiber attenuator 3, and then is reflected by the optical fiber reflector 5, and the original path returns and is injected into the semiconductor laser 1 to form an external cavity feedback light path, so that the semiconductor laser 1 generates chaos; and one light path with small splitting ratio output by the optical fiber coupler 2 is used as an output light path of the chaotic laser.
The scope of the invention is not limited to the above embodiments, and various modifications and changes may be made by those skilled in the art, and any modifications, improvements and equivalents within the spirit and principle of the invention should be included in the scope of the invention.
Claims (5)
1. A device for restraining chaotic laser delay characteristics by utilizing differential group delay is characterized in that: the optical fiber laser comprises a semiconductor laser (1), an optical fiber coupler (2), an optical fiber attenuator (3) and an optical fiber reflector (5), wherein all components are provided with optical fibers;
the semiconductor laser (1) is connected with the optical fiber coupler (2) through an optical fiber, namely the semiconductor laser (1) is connected with the light input port of the optical fiber coupler (2), the light output port of the optical fiber coupler (2) is divided into two optical paths, the splitting ratio of one optical path is larger than or equal to the other optical path, the optical path with the large splitting ratio is connected with the optical fiber attenuator (3) through the optical fiber, the optical fiber attenuator (3) is connected with the optical fiber reflector (5) through a differential group delay characteristic element (4), and the differential group delay characteristic element (4) is a few-mode optical fiber or a multimode optical fiber; and the light path with small splitting ratio of the optical fiber coupler (2) is an output light path of the chaotic laser.
2. The apparatus according to claim 1, wherein the apparatus for suppressing the chaotic laser delay characteristic by utilizing the dgd comprises: the optical fibers of all the components are single mode optical fibers, few mode optical fibers or multi-mode optical fibers, if the optical fibers connected with each other are the same, the optical fibers are connected through a flange, and if the optical fibers connected with each other are different, the optical fibers are connected in a fusion mode.
3. The apparatus according to claim 1, wherein the apparatus for suppressing the chaotic laser delay characteristic by utilizing the dgd comprises: the coupling ratio of the optical fiber coupler (2) adopts the proportion of 50:50, 60:40, 70:30, 80:20, 90:10 or 99: 1.
4. The apparatus according to claim 1, wherein the apparatus for suppressing the chaotic laser delay characteristic by utilizing the dgd comprises: the length of the differential group delay characteristic element (4) is more than or equal to 30 m.
5. The optical output method of the apparatus for suppressing the chaotic laser delay characteristic using dgd as claimed in claim 1, wherein: laser emitted by the semiconductor laser (1) passes through the optical fiber coupler (2), a light output port of the optical fiber coupler (2) is divided into two light paths, one light path with a large splitting ratio is used as a feedback light path, enters the differential group delay characteristic element (4) after passing through the optical fiber attenuator (3), is reflected by the optical fiber reflector (5), returns to the original path and is injected into the semiconductor laser (1), an external cavity feedback light path is formed, and the semiconductor laser (1) generates chaos; and the optical fiber coupler (2) outputs a light path with a small splitting ratio as an output light path of the chaotic laser.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102280815A (en) * | 2011-07-16 | 2011-12-14 | 太原理工大学 | Optical feedback chaos laser |
| CN103401130A (en) * | 2013-07-31 | 2013-11-20 | 太原理工大学 | Chirped fiber grating-based optical feedback chaotic laser |
| WO2019095529A1 (en) * | 2017-11-16 | 2019-05-23 | 太原理工大学 | Inp-based monolithic integrated chaotic semiconductor laser chip capable of feeding back randomly diffused light |
| CN111442789A (en) * | 2020-04-03 | 2020-07-24 | 南京晓庄学院 | Method for improving spatial resolution and measurement accuracy of sensing system based on mode multiplexing |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL2016112B1 (en) * | 2016-01-18 | 2017-07-25 | Draka Comteq Bv | Method of measuring time delays with respect to Differential Mode Delay, DMD, of a multi-mode fiber, MMF, or a few-mode fiber, FMF. |
| CN110006562B (en) * | 2019-02-28 | 2020-11-20 | 北京大学 | Distributed optical fiber sensing system based on mode coupling |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102280815A (en) * | 2011-07-16 | 2011-12-14 | 太原理工大学 | Optical feedback chaos laser |
| CN103401130A (en) * | 2013-07-31 | 2013-11-20 | 太原理工大学 | Chirped fiber grating-based optical feedback chaotic laser |
| WO2019095529A1 (en) * | 2017-11-16 | 2019-05-23 | 太原理工大学 | Inp-based monolithic integrated chaotic semiconductor laser chip capable of feeding back randomly diffused light |
| CN111442789A (en) * | 2020-04-03 | 2020-07-24 | 南京晓庄学院 | Method for improving spatial resolution and measurement accuracy of sensing system based on mode multiplexing |
Non-Patent Citations (1)
| Title |
|---|
| Time delay signature elimination of chaos in a semiconductor laser by dispersive feedback from a chirped FBG;DAMING WANG et al.;《OPTICS EXPRESS》;20170515;第25卷(第10期);第10911-10924页 * |
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