Reconfigurable Radar Waveform Generation by P1 Dynamics of Optically Injected Semiconductor Laser （Invited）

ZHANG Fangzheng; YU Xiaoyue; PAN Shilong; KONG Jiayuan; XU Zhenyu; FAN Junjie

doi:10.3788/gzxb20265503.0355109

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Reconfigurable Radar Waveform Generation by P1 Dynamics of Optically Injected Semiconductor Laser （Invited）

Special Issue for Microwave Photonics | 更新时间：2026-04-21

- Reconfigurable Radar Waveform Generation by P1 Dynamics of Optically Injected Semiconductor Laser （Invited）
- Acta Photonica Sinica Vol. 55, Issue 3, Pages: 136-154(2026)
- 作者机构：
  
  1.南京航空航天大学电子信息工程学院，南京 211106
  2.上海卫星工程研究所，上海 201100
- 作者简介：
- 基金信息：
  
  National Natural Science Foundation of China(62371224);Shanghai Aerospace Science and Technology Innovation Fund(KYCX25_0591)
- DOI：10.3788/gzxb20265503.0355109
  CLC： TN248.4
- CSTR：32255.14.gzxb20265503.0355109
- Received：08 August 2025，
  
  Revised：2025-09-29，
  
  Accepted：21 January 2026，
  
  Published：25 March 2026
- 稿件说明：
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张方正，余肖月，潘时龙，等. 基于光注入半导体激光器的宽带可重构雷达波形产生研究（特邀）［J］.光子学报，2026，55（3）：0355109

ZHANG Fangzheng， YU Xiaoyue， PAN Shilong， et al. Reconfigurable Radar Waveform Generation by P1 Dynamics of Optically Injected Semiconductor Laser （Invited）［J］. Acta Photonica Sinica， 2026， 55（3）：0355109
张方正，余肖月，潘时龙，等. 基于光注入半导体激光器的宽带可重构雷达波形产生研究（特邀）［J］.光子学报，2026，55（3）：0355109 DOI： 10.3788/gzxb20265503.0355109. CSTR： 32255.14.gzxb20265503.0355109.

ZHANG Fangzheng， YU Xiaoyue， PAN Shilong， et al. Reconfigurable Radar Waveform Generation by P1 Dynamics of Optically Injected Semiconductor Laser （Invited）［J］. Acta Photonica Sinica， 2026， 55（3）：0355109 DOI： 10.3788/gzxb20265503.0355109. CSTR： 32255.14.gzxb20265503.0355109.

摘要

在对半导体激光器单周期振荡进行理论与仿真的基础上，进行了基于光注入半导体激光器单周期振荡态产生单频信号与宽带雷达波形的实验研究，验证了利用所提方法产生可调谐单频信号与宽带可重构雷达波形的可行性。此外，针对产生信号性能受限于半导体激光器本征噪声等问题，在单频信号产生系统中引入双环路光电反馈结构，有效抑制了单频信号相位噪声；在宽带雷达波形产生系统中引入傅里叶域锁模结构，有效提升了信号带内信噪比与频率稳定度。最后，利用光注入半导体激光器单周期振荡的波形产生系统构建了单发单收与多发单收阵列雷达系统，发射信号为8 GHz（10~18 GHz）带宽的线性调频信号，通过目标探测实验验证了基于光注入半导体激光器单周期振荡的雷达波形产生在实现高分辨目标探测应用中的可行性。

Abstract

To meet the demands of future high-performance radar systems with superior resolution， agility and adptability， a reconfigurable radar waveform generation method based on the period-one （P1） oscillation dynamics of optically injected semiconductor laser is comprehensively investigated. The underlying principle involves perturbing the oscillation state of semiconductor laser through the injection of external continuous wave light. This perturbation alters the intracavity photons and carrier densities of laser， thereby exciting various nonlinear dynamics. Among these， P1 oscillation state exhibits asymmetric sideband modulation， which provides a theoretical basis for microwave signal generation.

Firstly， the characteristics of P1 oscillation， including the frequency tunability and fast frequency-switching capability， are numerically analysed by solving the nonlinear rate equations. Simulation results demonstrate that the transition between distinct oscillation frequencies can be achieved with a switching speed on the order of ns level， highlighting the inherent agility of the optical injection system. The evolution routing of the nonlinear dynamics is also explored through the dynamical map as a function of injection strength and detuning frequency， which provides a guide to achieve and maintain the desired P1 oscillation state. Based on this， the experimentally generation of broadband radar signals are demonstrated. To generate broadband radar signal， a dynamical control unit of injection parameters is proposed to manipulate the instantaneous frequency of generated wideband waveform. By programming the control signals， various broadband radar signals are generated successfully， including linear frequency modulated signal， triangular wave signal， stepped-frequency signal， frequency-codded signal， frequency-codded linear and frequency modulated signal. The key waveform parameters of broadband signal such as bandwidth， time period， operating band and duty cycle， can also be flexibly adjusted by tuning the injection parameters， which further validate the feasibility of the proposed system. However， the optical injection system in application falls short in performance due to a challenge induced by the intrinsic noise of semiconductor lasers. to address this， approaches for enhancing the system performance are proposed and demonstrated. For single-frequency signal generation， a dual-loop optoelectrical feedback structure incorporating balanced photodetection is employed to improve the Side-Mode Suppression Ratio （SMSR） and phase noise of generated signals.

Compared with conventional optical injection system， the linewidth of generated signal based above method is significantly narrowed by three-orders of magnitude. The SMSR is enhanced by about 65.5 dB due to the Vernier effect. In addition， the system maintains excellent frequency tunability while achieving a phase noise of below -124.10 dBc/Hz at 10 kHz offset. For broadband radar waveform generation， pre-compensation of the injection intensity and Fourier Domain Mode Locking （FDML） mechanism are incorporated， through which the in-band Signal-to-Noise Ratio （SNR） and frequency accuracy of generated radar waveforms are significantly improved. In the experiment， a broadband signal with a bandwidth of 6.3 GHz is generated， of which in-band SNR is improved by about 47 dB. In addition， limited by the transient properties of semiconductor laser， when the P1 oscillation frequency is fast changed with a large frequency step， strong damping oscillation of the output frequency occurs， resulting in deterioration of the frequency stability and accuracy. The application of the FDML mechanism is shown to effectively suppress the damping oscillation， once again underscoring the advantages of the proposed signal generation method.

To validate the practical utility of the proposed radar waveform generation method， both Single-Input Single-Output （SISO） radar and a Multiple-Input Single-Output （MISO） radar systems are established. Firstly， based on the proposed SISO radar system， high resolution radar ranging is successfully realized， clearly distinguishing two closely spaced targets. The measured result shows excellent agreement with the actual distance. For MISO radar system， in the transmitter， the generated signal is emitted by means of time-division multiplexing across multiple transmitter channels. In the receiver， broadband de-chirp processing is performed via IQ mixing. When detecting a drone in an experimental scenario， the target is precisely located， which verifies that the proposed radar waveform generation system is a promising solution to construct efficient and low-complexity microwave photonic radars.

关键词

Keywords

references

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