High-definition video broadcasting with a room-temperature quantum cascade laser emitting in the long-wave infrared domain
High-definition video broadcasting with a room-temperature quantum cascade laser emitting in the long-wave infrared domain
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使用长波红外域发射的室温量子级联激光器进行高清视频广播
DOI：
10.1117/12.2608511
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发表时间：
2022
期刊：
影响因子：
--
通讯作者：
F. Grillot
中科院分区：
文献类型：
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作者：
P. Didier;Ke Yang;O. Spitz;Alice Guillaume;Jun;F. Grillot
量子级联激光器（QCL）是自由空间通信的相关光源，因为它们可以在长波红外（LWIR）域中发射，即在8-12 μm区域中。该光学域的优点在于，它结合了高大气传输1和传播光束的减少的失真，2因此，与现有近红外系统相比，长波红外激光器的优越性非常依赖于链路的可用性。3此外，QCL的特征在于没有弛豫振荡共振。4这种特性可能意味着非常大的调制带宽，即使QCL结构仍然需要优化以避免寄生效应。5最近的实验努力已经突出了基于QCL的自由空间通信系统的潜力6 -8，并且当前的4 Gbits/s记录速率预计在不久的将来将在带宽增强的结构中表现得更好。空间实时视频广播，室温QCL发射8.1 µm。视频文件以未压缩的高清格式（1280像素x 720像素）编码，这对应于1.485 Gbits/s的数据速率和开关键控方案。该高速电信号通过偏置T形件的AC端口直接注入QCL。来自QCL的调制光信号用汞-镉-碲化物探测器检索，产生的电信号被发送到电视监视器，在那里可以实时观看视频。目前的研究结果表明，通信系统的多功能性与QCL和这铺平了道路，为实际领域的应用
Quantum cascade lasers (QCLs) are relevant optical sources for free-space communication because they can emit in the long-wave infrared (LWIR) domain, i.e. in the 8-12 µm region. The advantage of this optical domain is that it combines a high atmosphere transmission1 with a reduced distortion for propagating beams,2 thus the superiority of LWIR lasers in comparison with existing near-infrared systems is very dependent on link availability.3 Furthermore, QCLs are characterized by the absence of relaxation oscillation resonance.4 This peculiarity could imply a very large modulation bandwidth, even if QCL structures still need to be optimized to avoid parasitic effects.5 Recent experimental efforts have highlighted the potential of QCL-based free-space communication systems6–8 and the current 4 Gbits/s record rate is expected to be outperformed in the near future with bandwidth-enhanced structures.9 This work describes a free-space live video broadcasting with a room-temperature QCL emitting at 8.1 µm. The video file is encoded in uncompressed high-definition format (1280 pixels x 720 pixels) and this corresponds to a data rate of 1.485 Gbits/s with on-off keying scheme. This high-speed electrical signal is directly injected in the QCL via the AC port of a bias tee. The modulated optical signal from the QCL is retrieved with a Mercury-Cadmium-Telluride detector and the resulting electrical signal is sent to a TV monitor where the video can be watched in live. The current findings demonstrate the versatility of a communication system with QCLs and this paves the way for real-field applications