Bandwidth-enhanced LFM signal generation by period-one dynamics in a directly modulated semiconductor laser.

IF 3.1 2区物理与天体物理 Q2 OPTICS

Optics letters Pub Date : 2025-06-01 DOI:10.1364/OL.559656

Gengze Wu, Fangzheng Zhang, Xiaoyue Yu, Xin Yan, Hao Wang, Yuan Yu, Shilong Pan

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引用次数: 0

Abstract

Period-one (P1) laser dynamics provide effective methods for radar signal generation. However, the linearly frequency-modulated (LFM) signal bandwidth generated by P1 dynamics is constrained by the limited variation range of the injection strength. In this Letter, a bandwidth-enhanced LFM signal generation method by P1 dynamics in an optically injected directly modulated semiconductor laser (DM-SL) is proposed. In addition to controlling the injection strength via electro-optical modulation, which is the same as the previous schemes, the bias current of the DM-SL is regulated via direct modulation. By interaction between the carrier effect and temperature effect in the optically injected DM-SL, the P1 oscillation frequency is increased under the same optical injection strength, leading to the generation of LFM signals with enlarged bandwidth. In the experiment, the maximum signal bandwidth reaches 21 GHz (11.7-32.7 GHz), which is enhanced by 11 GHz compared with that generated without bias current regulation. The proposed method is a promising technique for ultra-wideband radar signal generators.

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直接调制半导体激光器中一周期动态产生带宽增强LFM信号。

激光一周期动力学为雷达信号的生成提供了有效的方法。然而，P1动态产生的线性调频（LFM）信号带宽受到注入强度变化范围的限制。本文提出了一种在光注入直接调制半导体激光器（DM-SL）中利用P1动力学产生带宽增强的LFM信号的方法。除了通过与前面方案相同的电光调制来控制注入强度外，DM-SL的偏置电流还通过直接调制来调节。通过光注入DM-SL中的载流子效应和温度效应的相互作用，在相同的光注入强度下，P1振荡频率增加，从而产生带宽增大的LFM信号。实验中，最大信号带宽达到21 GHz (11.7 ~ 32.7 GHz)，比无偏置电流调节时提高了11 GHz。该方法是一种很有前途的超宽带雷达信号发生器技术。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Optics letters 物理-光学

CiteScore

6.60

自引率

8.30%

发文量

2275

审稿时长

1.7 months

期刊介绍： The Optical Society (OSA) publishes high-quality, peer-reviewed articles in its portfolio of journals, which serve the full breadth of the optics and photonics community. Optics Letters offers rapid dissemination of new results in all areas of optics with short, original, peer-reviewed communications. Optics Letters covers the latest research in optical science, including optical measurements, optical components and devices, atmospheric optics, biomedical optics, Fourier optics, integrated optics, optical processing, optoelectronics, lasers, nonlinear optics, optical storage and holography, optical coherence, polarization, quantum electronics, ultrafast optical phenomena, photonic crystals, and fiber optics. Criteria used in determining acceptability of contributions include newsworthiness to a substantial part of the optics community and the effect of rapid publication on the research of others. This journal, published twice each month, is where readers look for the latest discoveries in optics.