阅读说明：本技术 一种基于反馈干涉原理产生混沌光装置 (Device for generating chaotic light based on feedback interference principle ) 是由 张建国 王云才 李璞 王安帮 李才 张国栋 于 2019-10-31 设计创作，主要内容包括：本发明涉及混沌信号领域,具体为一种基于反馈干涉原理产生混沌光装置。解决了传统混沌光信号产生方式所导致的抗干扰能力较差、低频部分的能量受到抑制导致混沌光的使用效率受限等技术问题。一种基于反馈干涉原理产生混沌光装置,包括用于输入第一探测光信号的第一3dB耦合器,第一3dB耦合器的两个输出端分别连接有第一半导体光放大器和第二半导体光放大器,第一半导体光放大器的输出端连接有第一环形器,第二半导体光放大器的输出端连接有第二环形器；第一环形器和第二环形器的反射端共同连接有第二3dB耦合器,第二3dB耦合器的输出端连接有第三环形器；还包括用于输入第二探测光信号的第三半导体光放大器。(The invention relates to the field of chaotic signals, in particular to a device for generating chaotic light based on a feedback interference principle. The chaotic light source solves the technical problems that the anti-interference capability is poor, the energy of a low-frequency part is restrained, the use efficiency of chaotic light is limited and the like caused by a traditional chaotic light signal generation mode. A device for generating chaotic light based on a feedback interference principle comprises a first 3dB coupler used for inputting a first detection light signal, wherein two output ends of the first 3dB coupler are respectively connected with a first semiconductor optical amplifier and a second semiconductor optical amplifier, the output end of the first semiconductor optical amplifier is connected with a first circulator, and the output end of the second semiconductor optical amplifier is connected with a second circulator; the reflecting ends of the first circulator and the second circulator are connected with a second 3dB coupler together, and the output end of the second 3dB coupler is connected with a third circulator; a third semiconductor optical amplifier for inputting the second probe optical signal is also included.)

1. A device for generating chaotic light based on a feedback interference principle is characterized by comprising a first 3dB coupler (1) used for inputting a first detection light signal, wherein two output ends of the first 3dB coupler (1) are respectively connected with a first semiconductor optical amplifier (2) and a second semiconductor optical amplifier (3), the output end of the first semiconductor optical amplifier (2) is connected with a first circulator (4), and the output end of the second semiconductor optical amplifier (3) is connected with a second circulator (6); the reflection ends of the first circulator (4) and the second circulator (6) are connected with a second 3dB coupler (5) together, and the output end of the second 3dB coupler (5) is connected with a third circulator (9); the optical fiber coupler also comprises a third semiconductor optical amplifier (7) used for inputting a second detection optical signal, wherein the output end of the third semiconductor optical amplifier (7) is connected with the reflection end of a third circulator (9), the output end of the third circulator (9) is connected with a 1 x 3 coupler (11), and two output ends of the 1 x 3 coupler (11) are respectively connected with a first optical delay line (8) and a second optical delay line (10) which are different in length; the output end of the first light delay line (8) is connected with the reflection end of the first circulator (4), and the output end of the second light delay line (10) is connected with the reflection end of the second circulator (6); the third output end of the 1 multiplied by 3 coupler (11) is used for outputting the chaotic optical signal.

2. The apparatus according to claim 1, wherein the first and second probe optical signals have different wavelengths.

3. The apparatus according to claim 1, wherein the powers of the first and second detecting light signals are not more than 1 mW.

4. The device for generating the chaotic light based on the feedback interference principle as claimed in claim 1, wherein the optical delay difference between the two feedback loops where the first optical delay line (8) and the second optical delay line (10) are located is smaller than the carrier recovery time of the third semiconductor optical amplifier (7).

Technical Field

The invention relates to the field of chaotic signals, in particular to a device for generating chaotic light based on a feedback interference principle.

Background

The chaotic signal has the characteristics of high bandwidth, unpredictability and the like, and is widely applied to the fields of secret communication systems, random number generators, laser radars, optical fiber sensing and the like.

At present, researchers mainly disturb the semiconductor laser in a semiconductor laser device by using optical feedback (Mork J, Tromborg B, Mark J. channel in semiconductor laser with optical feedback: the organ and experiment [ J ]. IEEE J Quantum Electron, 1992, 28(1):445-, Fiber lasers and the like generate chaotic light signals.

However, the addition of external disturbance brings many adverse factors, for example, the delay characteristic introduced by external cavity feedback can make the output signal have weak periodicity, and by extracting the delay information (delay size, feedback cavity length, feedback strength, etc.), the anti-interference capability of the system can be reduced, thereby threatening the safety of the whole chaotic light system; moreover, the chaotic intensity oscillation of a semiconductor laser is typically affected by the relaxation oscillation frequency of the laser. Through frequency domain analysis, the power spectrum distribution has obvious peaks at the relaxation oscillation frequency, so that the effective bandwidth is limited; in addition, since the electronic collecting device is similar to a low-pass filter in general, the energy of the low-frequency part is suppressed, and the use efficiency of the chaotic light is limited.

In consideration of the technical problems of poor anti-interference capability caused by a traditional chaotic light signal generation mode, limited use efficiency of chaotic light caused by the fact that the energy of a low-frequency part is restrained and the like, the applicant provides a device for generating the chaotic light based on a feedback interference principle.

Disclosure of Invention

The invention provides a device for generating chaotic light based on a feedback interference principle, which aims to solve the technical problem caused by the traditional chaotic light generation mode.

The invention is realized by adopting the following technical scheme: a device for generating chaotic light based on a feedback interference principle comprises a first 3dB coupler used for inputting a first detection light signal, wherein two output ends of the first 3dB coupler are respectively connected with a first semiconductor optical amplifier and a second semiconductor optical amplifier, the output end of the first semiconductor optical amplifier is connected with a first circulator, and the output end of the second semiconductor optical amplifier is connected with a second circulator; the reflecting ends of the first circulator and the second circulator are connected with a second 3dB coupler together, and the output end of the second 3dB coupler is connected with a third circulator; the optical fiber coupler also comprises a third semiconductor optical amplifier used for inputting a second detection optical signal, wherein the output end of the third semiconductor optical amplifier is connected with the reflecting end of a third circulator, the output end of the third circulator is connected with a 1 × 3 coupler, and two output ends of the 1 × 3 coupler are respectively connected with a first optical delay line and a second optical delay line; the output end of the first light delay line is connected with the reflection end of the first circulator, and the output end of the second light delay line is connected with the reflection end of the second circulator; the third output terminal of the 1 × 3 coupler is used for outputting the chaotic optical signal.

The device for generating the chaotic light based on the feedback interference principle is constructed, the problems caused by the traditional chaotic light generating mode, such as time delay characteristic and the like, can be solved, and the safety threat of the chaotic light system is effectively eliminated.

The chaotic light is used as a phase chaotic signal, and provides possibility and basis for realizing a high-speed acquisition and quantization process in the later period.

Moreover, the novel chaotic light generating device can generate chaotic light signals with wide frequency spectrum and high entropy, and has important value in the fields of secret communication systems, random number generators, optical radars, optical fiber sensing and the like.

Drawings

Fig. 1 is a schematic structural diagram of a device for generating chaotic light based on the principle of feedback interference.

1-first 3dB coupler, 2-first semiconductor optical amplifier, 3-second semiconductor optical amplifier, 4-first circulator, 5-second 3dB coupler, 6-second circulator, 7-third semiconductor optical amplifier, 8-first optical delay line, 9-third circulator, 10-second optical delay line and 11-1 x 3 coupler.

Fig. 2 is a timing diagram of the chaotic light.

Fig. 3 is a Lyapunov index diagram of chaotic light.

Detailed Description

The first and second detection optical signals have different wavelengths.

The power of the first detection optical signal and the power of the second detection optical signal are not more than 1 mW.

The lengths of the first optical delay line 8 and the second optical delay line 10 in the two feedback loops are different.

The optical delay difference between the two feedback loops where the first optical delay line 8 and the second optical delay line 10 are located is smaller than the carrier recovery time of the third semiconductor optical amplifier 7.

As shown in fig. 1, the present invention provides a device for generating chaotic light based on the feedback interference principle, including: a circulator, a 3dB coupler, an SOA, an optical delay line, and a 1 × 3 coupler; first probe light λ^/Injecting a first 3dB coupler 1 from the A end; the first 3dB coupler 1 is divided into two paths to output, and is respectively connected with the first semiconductor optical amplifier 2, the first circulator 4, the second semiconductor optical amplifier 3 and the second circulator 6 in sequence; the outputs of the first circulator 4 and the second circulator 6 are both connected to the input of the second 3dB coupler 5An output terminal of the second 3dB coupler 5 is connected to an input terminal of the third circulator 9; second probe light λ^//Injecting a third semiconductor optical amplifier 7 from the end B, wherein the output end of the third semiconductor optical amplifier 7 is also connected to the input end of the circulator 9; the output end of the circulator 9 is connected to the input end of the 1 × 3 coupler 11, the output of the 1 × 3 coupler 11 is divided into 3 paths, and the two paths are used as feedback and are respectively connected with the first optical delay line 8, the first circulator 4, the first optical delay line 10 and the first circulator 6 in sequence; the other 1 path is used as the output of the chaotic light signal.

The specific working process is as follows: injecting first detection light with the wavelength of 1550nm into the end A, and outputting the first detection light in two paths through a first 3dB coupler 1; the first detection light enters a second 3dB coupler 5 through a first semiconductor optical amplifier 2 and a first circulator 4 in sequence; similarly, the first probe light enters the second 3dB coupler 5 through the second semiconductor optical amplifier 3 and the second circulator 6 in sequence. Because in the initial state, both the two feedback loops have no optical signal input and no SOA carrier is consumed, the first semiconductor optical amplifier 2 and the second semiconductor optical amplifier 3 respectively output high power through the first circulator 4 and the second circulator 6 when the first probe light experiences the same gain; because of the feedback of the optical signals, the two paths of probe light generate the same phase change through the SOA, and the optical signals are subjected to interference cancellation in the second 3dB coupler 5 through the first circulator 4 and the second circulator 6 according to the cross phase modulation principle; when probe light enters an SOA (third semiconductor optical amplifier 7) through the third circulator 9, no current carrier is consumed, and second probe light with the wavelength of 1554nm generates a cross gain modulation effect through the third semiconductor optical amplifier 7, and outputs an optical signal opposite to the input optical signal, namely high power; then 3 paths of optical signals are generated by the 1 x 3 coupler 11, 1 path of optical signals is used as output, 2 paths of optical signals are used as feedback signals and act on the first circulator 4 and the second circulator 6 through the first optical delay line 8 and the second optical delay line 10 respectively.

When the feedback light delays are equal, the output light signal is high power and simultaneously reaches the first circulator 4 and the second circulator 6 through the first light delay line 8 and the second light delay line 10 respectively; similarly, the two paths both consume SOA carriers, and the outputs of the first semiconductor optical amplifier 2 and the second semiconductor optical amplifier 3 through the first circulator 4 and the second circulator 6 are both low power under the condition that the second probe light experiences the same gain; because of the feedback of the optical signals, the two paths of probe light generate the same phase change through the SOA, and the optical signals are subjected to interference cancellation through the second 3dB coupler 5 according to the cross phase modulation principle; similarly, the output of the 1 × 3 coupler 11 is high power, the process is sequentially circulated, and the chaotic light signal is in a "static" state.

When the feedback light time delays are unequal, the output light signals are high power and cannot reach the first circulator 4 and the second circulator 6 simultaneously through the first light time delay line 8 and the second light time delay line 10 respectively; if the output optical signal reaches the first circulator 4 through the first optical delay line 8, the first semiconductor optical amplifier 2 carrier is consumed, and the output is low power through the first circulator 4; the second circulator 6 does not consume the current carrier of the second semiconductor optical amplifier 3 because no feedback optical signal is input at this time, and the output is high power through the second circulator 6; because the two feedback signals are inconsistent, the two detection light beams generate pi phase difference through the SOA and have interference and phase lengthening through the second 3dB coupler 5; and finally the output of the 1 × 3 coupler 11 is low power, and the optical signal is fed back to the first circulator 4 and the second circulator 6 through the first optical delay line 8 and the second optical delay line 10. The process is circulated in sequence, and the output optical signal can generate periodic oscillation; by further adjusting the feedback delay difference to be smaller, abnormal pulse occurs in the SOA carrier recovery time, so that uncertain optical signals are output, and the output is repeated in sequence, and the optical signals are found to have random oscillation, so that chaotic light with the characteristics of binary change (high and low power), random change of phase, broadband and the like is generated. As shown in fig. 2, the amplitude of the optical signal varies in two values; as shown in fig. 3, the Lyapunov exponent is positive, indicating that the oscillating optical signal is chaotic.