We demonstrate a low-complexity and a programmable massively parallel chaos source with 40 channels and wide bandwidth of ~34 GHz/channel, which breaks conventional scaling trade-offs, thereby enabling ultrafast random bit generation with 2.4 Tbit/s

To address growing AI/ML bandwidth and energy efficiency demands, we propose an O-band ring resonator modulator (RRM) with a vertical PN-junction for high-speed optical interconnects. We demonstrate up to 280 ~Gb / s PAM4 and 2 5 0 ~ G b / s PAM6 optical-amplification-free transmission over 5 0 0 m SMF, meeting HD-FEC requirements

A 300-Gb/s/λ net data rate PAM4 link based on a >67-GHz GeSi electro-absorption modulator is demonstrated. By using a BU-GRU equalizer, we achieve BER below 6.25% overhead HD-FEC threshold after 100-meter SMF transmission.

Integrated sensing and communications (ISAC) is a key enabling technology for 6G networks, as it unifies radar sensing and data transmission within a shared infrastructure. Analog radio-over-fiber (ARoF) has emerged as a crucial technology for extending radar coverage and enabling distributed radar sensing. By incorporating pulse position modulation (PPM), it is possible to simultaneously measure the target’s range and transmit data, thereby increasing the energy efficiency of such systems. In this research, we present a novel ARoF-based ISAC-capable pulse radar system that features a custom-built PPM modulator employing a digital-to-time converter, and a high-accuracy time tagger as the demodulator, allowing for pulse time of arrival measurements with an root mean square accuracy up to 1.5 ps. The experimental results show a 5 Mbit/s data transmission along with a bit error ratio less than 5.86 × 10−7 at a 95% confidence level, using a PPM slot duration of 750 ps in an optical system featuring more than 40 km of single-mode optical fiber and a simultaneous range measurement with error less than 0.86 cm. In addition to ISAC exploration, the impact of fiber-induced chromatic dispersion on the PPM signal is studied, and the system is validated in an outdoor environment with a moving target

The mid-infrared (MIR) free-space optical (FSO) transmission systems based on quantum cascade laser (QCL) have attracted substantial attention. Nevertheless, a major limitation persists at the receiver side, which remains dominated by mercury cadmium telluride (MCT) detectors due to the lack of competitive alternatives. This prevalent reliance is particularly problematic in the mid-wave infrared (MWIR) band, where MCT detectors are fundamentally constrained by limited modulation bandwidth and cooling requirements. This study explores the potential of MWIR FSO transmission that leverages an MWIR uni-traveling carrier photodiode (UTC-PD) to attain high-speed communication. We present an experimental demonstration of an MWIR FSO link at 4.65 μm, combining a directly-modulated (DM) QCL with an uncooled UTC-PD detector based on InAs/InAsSb type-II superlattices. A transmission data rate of up to 14 Gb/s over a 31-m optical path length (OPL) is successfully achieved, demonstrating superior performance compared to a benchmark commercial MCT. Our findings suggest that the UTC-PD-based MIR FSO receiver offers a promising solution towards the next generation of optical wireless communication networks

The performance of fiber-optic systems is limited by impairments such as dispersion and nonlinearities, which are mitigated by physics-based models (e.g., digital backpropagation) or data-driven methods. A hybrid cascaded learning (CL) approach improves performance by using neural networks (NNs) to correct post-model residual errors, but it is not robust to parameter mismatches that distort the model's input and induce pre-model errors. We propose a neural augmentation (NA) scheme where an NN preprocesses the model input to correct these pre-model errors, enhancing robustness. By combining NA and CL, we introduce a dual-end augmented network (DEAN) that concurrently addresses both error types. Implemented with reservoir computing, the DEAN architecture generates dual corrections with minimal computational overhead. Numerical analysis of a 32-Gbaud 16-QAM system demonstrates that DEAN reduces the bit error rate by an order of magnitude compared to CL or NA alone, while maintaining a similar level of computational complexity. This approach bridges the gap between model accuracy and adaptability, enabling reliable fiber communication under real-world parameter variations

A software-programmable integrated microwave photonic filter enabled by photonic circuits is demonstrated for suppressing strong RF interference in a 2 Gb/s QPSK RF communication system, achieving more than 40% EVM improvement.

We present a J-band waveguide-coupled UTC-PD module that simultaneously achieves high responsivity and output power, enabling a stable 286 GHz photonic wireless link over 10 m with 200 Gbit/s polarization-multiplexed QPSK high-capacity transmission.

Free-space optical (FSO) communication is rapidly advancing as a high-capacity wireless technology, with growing interest in extending its operation from the traditional near-infrared to the mid-infrared (mid-IR) spectral region. Particularly, the mid-wave infrared (MWIR) and long-wave infrared (LWIR) atmospheric transmission windows in the mid-IR region provide advantages regarding reduced turbulence effects, scattering and absorption, enabling more robust links under adverse conditions. This review presents recent progress in MWIR and LWIR FSO communication systems, highlighting advances in transmitter and receiver technologies, such as quantum cascade lasers (QCLs), lithium niobate modulators and detectors, including quantum cascade detectors (QCDs), mercury cadmium telluride (HgCdTe and MCT) photodiodes and quantum-well infrared photodetectors (QWIPs). Experimental demonstrations achieving multigigabit to tens-of-gigabit data rates with advanced modulation formats, digital equalisation and coherent detection are summarised. The paper discusses integration trends in MWIR and LWIR photonics, coherent communication strategies and hybrid FSO–radio frequency (RF) architectures. Together, these developments outline the pathway for MWIR and LWIR FSO systems to evolve from laboratory demonstrations towards scalable, practical platforms for next-generation terrestrial and space communication networks

We demonstrate the first silicon-photonics plasmonic O-band resonant ring modulator with on-chip losses of 2.2dB, reaching net 400Gbps by employing PAM8 signaling. We show improved temperature stability compared to pure SiPh rings, lowering control efforts.