The escalating surge in datacenter traffic creates a pressing demand for augmenting the capacity of cost-effective intensity modulation and direct detection (IM/DD) systems. In this Letter, we report demonstration single-lane 128-GBaud probabilistically shaped (PS)-PAM-20 IM/DD transmission using only single digital-to-analog converter (DAC) net 400 G/λ system. Based on advanced digital signal processing (DSP), achieve bitrates up to 437 Gb/s optical back-to-back 432 after 0.5-km SSMF C-band...

Emerging services such as 8K/16K high-quality video streaming, virtual reality/augmented reality, beyond-5G mobile Internet, and edge computing are driving the need for even higher speed, capacity, flexibility in optical access networks. Coherent passive networks (CPONs) have garnered significant attention recent years due to their superior receiver sensitivity high 100G speeds beyond. Research interest has surged flexible, multi-dimensional multiplexing schemes that go beyond traditional...

Increasing bandwidth requirements have posed significant challenges for traditional access networks. It is difficult intensity modulation/direct detection to meet the power budget and flexibility of next-generation passive optical network (PON) at 100G beyond considering new requirements. This driving researchers develop novel technologies. Low-cost, wide-coverage, high-flexibility coherent PON emerging as a strong contender in competition. In this article, we will review technologies that...

The coherent passive optical network (PON) is a promising solution for the next generation of high-speed access network, capable supporting 100G and beyond data rate. Moreover, flexibility adaptability PON (CPON) have attracted increasing interest. A flexible can enhance system throughput through adaptive modulation formats, baud rates, coding techniques. One critical challenge adaptive-modulation CPON need fast-tracking channel status, particularly downstream transmission. This important as...

The coherent passive optical network (CPON) has received a great deal of attention in recent years due to its superior receiver sensitivity and extended power budget for 100G beyond. In order fully utilize the channel capacity achieve adaptive rate adjustment flexible (FLCS-CPON), constellation-shaping techniques, such as probabilistic shaping (PS), have been introduced. Unlike long-distance transmission networks, which are subject average constraint when amplifiers utilized, commercial...

We propose an end-to-end (E2E) fiber-terahertz (THz) integrated communication system based on attention-assisted multi-access autoencoder (AMAE) neural network. The AMAE network comprises artificial networks (ANNs) that function as transmitters (T-ANNs), channel models, and receivers (R-ANNs) for multiple users. By connecting the computational graph of T-ANNs R-ANNs, we jointly optimize to facilitate E2E communication. Attention mechanisms guide optimization process achieve fair efficient...

We proposed and experimentally demonstrated a novel two-dimensional end-to-end deep-learning-based autoencoder for fiber-THz integrated 6G radio-access-network at 220 GHz. More than 1.8-dB sensitivity gain is achieved compared with traditional QAM modulation formats 40Gbps.

Fiber-wireless integration has been widely studied as a key technology to support radio access networks in sixth-generation wireless communication, empowered by artificial intelligence. In this study, we propose and demonstrate deep-learning-based end-to-end (E2E) multi-user communication framework for fiber-mmWave (MMW) integrated system, where neural (ANN) are trained optimized transmitters, ANN-based channel models (ACM), receivers. By connecting the computation graphs of multiple...

To avoid burst-signal processing in downstream transmission during modulation-format switching, we propose and experimentally demonstrate a pilot-aided DSP scheme with continuous SOP tracking, carrier-phase recovery, channel estimation 300G flexible CPON based on 4/16/64-QAMs.

We propose and demonstrate a novel three-dimensional flexible coherent PON with the resource-allocation capability in time, frequency power domain. High flexibility is demonstrated >100G over 20-km fiber for downstream.

A flexible coherent passive optical network (FLCS-CPON) is a promising solution for the future access network. By offering increased speed, sensitivity, and flexibility, it enables more efficient utilization of resources allows serving larger number users. However, past studies often overlook flexibility channel equalization. In FLCS-CPON, customized rate optimization has been achieved to cater users in different conditions. addition optimization, further performance improvement can be by...

For the first time, we proposed and demonstrated auxiliary management control channel (AMCC) in frequency division multiplexing coherent passive optical network (FDM-PON) based on digital subcarriers (DCM) to transmit information reduce latency of signal transmission. We propose an extraction algorithm detect AMCC signals. A 4-band FDM QPSK PON system a total 100-Gbps data rate with 24-Mbps non-return-to-zero (NRZ) was performance at different modulation index (MI) analyzed.

The auxiliary management and control channel (AMCC) is an extra transmitting signal to not change the GPON frame reduce PON system latency. In this paper, we demonstrate AMCC for information transmission in a coherent frequency division multiplexing passive optical network (FDM-PON). our work, introduce multiplication scheme of digital superimposition theoretically show that can maintain high signal-to-noise ratio (SNR) main signal. Thus, apply superimposed FDM-PON. addition, propose novel...

We experimentally demonstrate a 1.92-Tb/s CPRI-equivalent data-rate supporting 1024-QAM OFDM signal in direct-detection-based digital-analog radio-over-fiber mobile-fronthaul link using ANN for pre-equalizations. Performances of pre-equalizers or post-equalizers based on different methods are also studied.

We propose and demonstrate the transmission of AMCC a novel signal-compensation method for data-channel in coherent FDM-PON. Sensitivity improvement 6 dB is demonstrated with 150G capacity over 20-km fiber FDM-PON AMCC.

We propose and demonstrate a hybrid, multi-format flexible-rate coherent PON system supporting ultimate-simplified full-coherent receivers based on the compatible OLT setup, achieving 50 to 300 Gbps access in FLCS-CPON 4/16/64-QAMs.

For the first time, we experimentally demonstrate net-400-Gb/s/lane 150-GHz-spaced 4λ-WDM transmission over 0.5-km SSMF in C-band for intra-datacenter-interconnects based on 128-GBaud probabilistically shaped PAM-20, using a single DAC per channel and driver-free, high-bandwidth TFLN modulators.

We presented a comparison study of multiplication-based and addition-based auxiliary management control channels (AMCC) on the performance both AMCC main signal in frequency division multiplexing coherent passive optical networks (FDM-CPON).

We propose and demonstrate a novel three-dimensional flexible coherent PON with the resource-allocation capability in time, frequency power domain. High flexibility is demonstrated >100G over 20-km fiber for downstream.

We have experimentally demonstrated a constant envelope linear frequency modulated orthogonal division multiplexing (CE-LFM-OFDM) signal by employing an (OFDM) to phase modulate the modulation (LFM) carrier. The experimental verification was conducted in photonic-based integrated sensing and communication (ISAC) system working at 94.5 GHz. In our system, 10-km optical fiber 1-m free space transmission are incorporated, achieving seamless fiber-wireless networks. As result, we achieved data...

We proposed and experimentally demonstrated a high-speed reliable underwater visible light communication (UVLC) system using single-input multi-output (SIMO)-based adaptive diversity combining technology (ADCT) with deep neural network (DNN) for performance enhancements. The Maximum Ratio Combine (MRC) algorithm is used ADCT SIMO receiver-array to combat the turbulence, multi-layer perception (MLP)-based DNN employed compensate nonlinearity impairments. To best of our knowledge, this first...

In this paper, we demonstrate a high-speed visible light communication system employing 520-nm green laser diode. A recorded data rate of 15.004 Gbps is reported by utilizing an adaptive bit-loading discrete multitone (DMT) modulation scheme with measured bit error ratio (BER) $3.724 \times 10^{-3}$, which satisfies the forward-error-correction (FEC) criteria. The results suggest has high spectral efficiency 5.456 bit/s/Hz at 2.75 GHz bandwidth.