The integrated radar jamming and secure communication system providing both false target and high physical layer transmission security will play an important role in future electronic warfare systems. In this letter, we present and experimentally validate a novel photonics-based integrated system that combines radar jamming with secure communication. The system incorporates velocity and range false targets generation for effective radar deception jamming, along with a secure communication function boasting a remarkable key space of 10 ¹⁵⁶ with the help of Li's hyperchaotic model. The Ka-band radar deception jamming and chaotic encrypted communication signals are simultaneously generated by a photonic frequency upconverter, which consists of a Mach–Zehnder modulator (MZM), an optical filter, an in-phase/quadrature (I/Q) modulator, and dual-drive Mach–Zehnder modulator (DDMZM), and a photodetector (PD). In a proof-of-concept experiment, the generated velocity deception jamming signal extended beyond 40 GHz, achieving a remarkable spurious suppression ratio of over 30 dB. The range deception jamming is also investigated. Meanwhile, the chaotic encrypted 4 Gbaud 16 quadrature amplitude modulation (16QAM) and 32 quadrature amplitude modulation (32QAM) orthogonal frequency division multiplexing (OFDM) signals over a distance of 1 m are successfully demonstrated. The proposed scheme can reduce enemy radar detection capabilities and enhance communication security ability, which is required by future electronic warfare systems.

Photon-assisted generation of terahertz (THz) signals can support larger modulation bandwidths in future ultrahigh-speed wireless communication systems. Single-input–multiple-output (SIMO) or multiple-input–multiple-output (MIMO) technology effectively uses the spatial dimension to improve the quality of the received signal, such as signal-to-noise ratio (SNR) and bit error rate (BER) ratio. Therefore, we experimentally demonstrate $D$ -band photon-assisted THz 1 $\times$ 2 SIMO 4.6-km wireless communication. We use a photon-assisted THz technology to generate a 124.37-GHz $D$ -band signal, which is received according to the maximum ratio combining (MRC) technology after 1 $\times$ 2 SIMO wireless transmission and uses fully blind digital signal processing (DSP) for carrier recovery algorithm without any training sequence. According to the experimental results, the maximum SNR diversity gain between 1 $\times$ 1 and 1 $\times$ 2 SIMO can be up to 2.8 dB. After the MRC algorithm, the BER can be reduced by one order of magnitude, which is less than 15% of soft decision forward error correction (SD-FEC). This is the first experimental demonstration of high gain and long range in a $D$ -band THz 1 $\times$ 2 SIMO system with a line rate of 43.5 Gb/s. These results will provide important assistance to our future efforts in photon-assisted THz wireless communications.

In this article, we propose a novel photonic-based integrated scheme that simultaneously achieves radar jamming signal generation and chaotic encrypted wireless communication. The velocity deception jamming signals are generated with a high spurious suppression ratio of 31.9–33.2 dB. Additionally, the range deception jamming has been efficiently executed. Simultaneously, an encrypted 64-quadrature amplitude modulation (64QAM) OFDM signal with a key space of 10 $^{50}$ is transmitted over a 1.5-m wireless link, meeting the hard decision forward error correction (HD-FEC) threshold of 3.8 $\times$ 10 $^{-3}$ , corresponding to a net rate of 9.9 Gbit/s. In addition, a maximum modulation error ratio (MER) of 21.4 dB is achieved below the error vector magnitude (EVM) threshold of 9%. The proposed scheme effectively combines the capabilities of degrading enemy radar detection and enhancing one’s wireless communication security, which may be a potential application for electronic countermeasures in the future.

To improve the capacity, reliability, and adaptability of data transmission in x-haul networks, hybrid systems that integrate free-space optical (FSO) and millimeter wave (mmWave) technologies have been proposed as promising solutions. This paper proposes a novel key accompanying scheme for hybrid FSO-mmWave systems, utilizing a six-dimensional (6D) hyperchaotic model to enhance system security. Meanwhile, the chaotic key is embedded in the pilot subcarriers, enabling the simultaneous transmission of key and signals. In the proposed scheme, the 6D hyperchaotic system is utilized to obtain six distinct sequences exhibiting chaotic behavior, subsequently employed for multidimensional encryption of orthogonal frequency division multiplexing (OFDM) signals. The key is embedded into the pilot subcarriers of the OFDM signal to enable key accompanying transmission. In the experimental demonstration, 8 Gbaud 16-quadrature amplitude modulation (16QAM) signals are successfully transmitted over a 40 m FSO link and a 2 m wireless link operating at 30 GHz, achieving a data rate of 32 Gb/s. Furthermore, the key space is up to 10²⁰⁷, which significantly enhances the system's security. Experimental results verify that the scheme effectively enhances system security while facilitating seamless key accompanying transmission. The proposed scheme exhibits significant potential for practical deployment in future Hybrid FSO-mmWave secure communication systems.

This paper reports a photonics-assisted millimeter-wave (mm-wave) joint radar jamming and secure communication system constructed through a photonic upconversion technique. In the experiments, a 30 GHz constant envelope linear frequency-modulated orthogonal frequency division modulation (CE-LFM-OFDM) signal with an instantaneous bandwidth of 1 GHz is synthesized by encoding 1 GBaud encrypted 16-quadrature amplitude modulation (16-QAM) OFDM signal. The velocity deception jamming is achieved with a spurious suppression ratio over 30 dB. Furthermore, we efficiently execute range deception jamming with a time shift of 10 ns. Simultaneously, the encrypted 16-QAM OFDM signal is successfully transmitted over a 1.2 m wireless link, with a data rate of 4 Gbit/s.

In the future 6G networks, the integrated sensing and communication (ISAC) technologies in the millimeter-wave (mmWave) band will foster innovation across multiple emerging fields, bringing substantial improvements to society. To address the limitations of ISAC systems based on conventional electronic methods in the mmWave band, the photonics-assisted scheme has been developed, offering advantages such as wide operating bandwidth and immunity to electromagnetic interference. However, in increasing non-line-of-sight (NLOS) propagation scenarios, the prevalent multipath effects significantly degrade the performance of photonics-assisted mmWave ISAC systems. In this paper, we propose a novel photonics-assisted mmWave ISAC system employing the orthogonal time frequency space (OTFS) modulation. The system employs OTFS modulation to map data to the delay-Doppler (DD) domain, enhancing the communication performance in NLOS scenarios. Experimental results demonstrate a 15.71 Gbit/s net data rate and 3 cm range resolution over 1 m wireless link. Furthermore, the proposed OTFS-based ISAC system demonstrates promising potential for NLOS scenarios by improving communication performance while maintaining high sensing resolution.