A5008465270- Optical Network Technologies
- Advanced Photonic Communication Systems
- Advanced Optical Network Technologies
- Advanced Fiber Laser Technologies
- Photonic and Optical Devices
- Semiconductor Lasers and Optical Devices
- graph theory and CDMA systems
- Photonic Crystal and Fiber Optics
- Optical Wireless Communication Technologies
- Acute Ischemic Stroke Management
- Artificial Intelligence in Healthcare
- Advanced MIMO Systems Optimization
- Retinal Imaging and Analysis
- Advanced Wireless Communication Technologies
- Radar Systems and Signal Processing
- Telecommunications and Broadcasting Technologies
- Multiple Myeloma Research and Treatments
- Millimeter-Wave Propagation and Modeling
- AI and Big Data Applications
- Stroke Rehabilitation and Recovery
- E-commerce and Technology Innovations
- Seismology and Earthquake Studies
- Wireless Signal Modulation Classification
- Machine Learning in Healthcare
- Peripheral Artery Disease Management
Chulalongkorn University
2012-2025
Cerebrovascular diseases such as stroke are among the most common causes of death and disability worldwide preventable treatable. Early detection strokes their rapid intervention play an important role in reducing burden disease improving clinical outcomes. In recent years, machine learning methods have attracted a lot attention they can be used to detect strokes. The aim this study is identify reliable methods, algorithms, features that help medical professionals make informed decisions...
Rehabilitation after a stroke is vital for regaining functional abilities. However, shortage of rehabilitation professionals leads to many patients with severe disabilities. Traditional methods can be time-consuming and hard measure progress. This study introduces an innovative machine learning (ML) approach lower limb in patients. The proposed methodology integrates two models: fuzzy logic rule-based system K-Nearest Neighbor(K-NN) model. model utilizes the Fugl-Meyer Assessment evaluate...
This paper explores, through the utilization of analytical models and simulations, bit error rate (BER) 400GBASE-LR8/ER8 in back-to-back configuration, considering various extinction ratio (ER) values photodetector types. Simulation transmission over fiber is carried out to measure chromatic dispersion (CD) penalty each scenario. To increase distance, we simulated a multi-span with inline optical amplifiers (OAs). We mitigated effects CD-induced power fading by employing equalization such...
At present, 5G networks have started rolling out worldwide. The network first launched using the new frequency bands, sub-6GHz (FR1) and mmWave (FR2). With these operators can provide data rate higher than Gbps with sufficiently low latency. Moreover, integration of FR1 FR2 reduces congestion when numerous number devices are connected. This paper aims to propose a design approach for 5G-NR radio planning both any selected outdoor indoor areas, then we show calculation base stations that...
We present for the first time a complete theoretical analysis of sideband instability (SI) that occurs when two kinds fibers with different characteristics are concatenated to form dispersion-managed fiber link. In analysis, following three cases taken into account: case (a) dispersion-management period is larger than an amplification period, (b) lengths equivalent, and (c) smaller period. find SI gain peak appears at frequencies determined by variation periods. Moreover, all cases,...
In optical phase conjugation (OPC) systems, the third-order dispersion (TOD) of fibers and nonlinear resonance at well-defined signal sideband frequencies called instability (SI) mainly limit transmission performance. We propose, for first time, a scheme simultaneous suppression both TOD SI in OPC systems using periodic higher order dispersion-managed link consisting standard single-mode (SMFs) reverse (RDFs). Computer simulation results demonstrate possibility 200-Gb/s data over 10 000 km...
An alternative application of distributed Raman amplification (DRA) for ultralong-haul optical fiber transmission is proposed. In our study, the DRA employed in a system using midway phase conjugation (OPC) amplifying an signal and, at same time, constructing power evolution, which symmetrical with respect to midpoint where OPC performed. Then, nonlinear waveform distortions that are caused by Kerr effect, as well dispersion, almost completely compensated OPC, whereas loss DRA. Three...
We study, by computer simulation, the feasibility for realizing next generation of access network based on 40-Gbps signal transmission over passive optical (PON) using various data modulation formats: NRZ-OOK, RZ-OOK, RZ-DPSK, and RZ-DQPSK. show success 20 km PON with an inline dispersion compensation both in time-division multiple (TDMA) code division (OCDMA) schemes under BER less than 10 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML"...
In this paper, we propose a FTTx system using an active wavelength selective switch (WSS) incorporated with dynamic and bandwidth allocation (DWBA) in order to improve the efficiency consumption of based on division multiplexed passive optical network (WDM-PON). Under control by DWBA, appropriate numbers coarse (CWDM) wavelengths different time intervals are generated under requests for data rates from subscribers. The computer simulation results, rate 10 Gbps per wavelength, demonstrate...
In optical phase conjugation systems, the third-order dispersion of fibers almost linearly accumulates along transmission distance, and distortion induced from can be perfectly compensated by using a linear compensator placed at any point system. We demonstrate numerical simulations that 100-Gb/s single-channel achieved over 10000-km distance in midway systems compensating dispersion.
Age‐related macular degeneration (AMD) diagnosis using fundus images is one of the critical missions eye‐care screening program in many countries. Various proposed deep learning models have been studied for this research interest, which aim to achieve mission and outperform human‐based approaches. However, efforts are still required improvement model classification accuracy, sensitivity, specificity values. In study, we named as ViT‐AMD, based on latest Vision Transformer (ViT) structure, a...
We report the feasibility of 100 Gbps per channel QPSK signal transmission to employ concept flexible network on fiber access by using polarization division multiplexed coherent optical orthogonal frequency multiplexing (PDM-CO-OFDM) based superchannel signal, self-coherent detection and incorporated with wavelength selective switch (WSS), which is replaced passive splitter in an installed FTTx order respond various demand from different units (ONUs). The computer simulation results over...
In this paper, we study the performance limitation of 10-Gbps-per-channel-based coarse wavelength division multiplexed passive optical network (CWDM-PON). The computer simulation results, which are in a good agreement with theoretical calculation show that transmission all 16 CWDM channels (1,271-1,571 nm) is successfully obtained at maximum reach 68.2 km under FEC limit (BER= 10 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">4</sup> ). Both...
We demonstrate the feasibility of 40-Gbps RZ-DQPSK signal transmission over PON which is consisted 20-km SMF and 1:32 optical splitter by employing an inline SC-DCU.
This paper presents an algorithm for the design of wireless-optical broadband access network (WOBAN) considering multi-hop wireless connection among subscribers. With our algorithm, we can specify number hop in which subscribers to optical units (ONUs) or base stations (BSs). Our will give optimum positions, as well number, ONU required network, when is given.Furthermore, also assign shortest routes connecting Noted that placement, ONU, and subscribers, vary with designed constraints such...
The performance improvement of a 40 Gbit/s soliton transmission system employing nonlinear optical loop mirror (NOLM) as an all-optical regenerative repeater is investigated. switching characteristic the NOLM optimized using our design strategies. By inserting where eye-penalty transmitted signal becomes 1 dB, we achieve 0.3 dB resulting in further 480 km distance.
The performances of optical phase conjugation (OPC) in reducing the nonlinear noise accumulation DPSK transmission is theoretically analyzed and compared with that periodic dispersion-compensated (DC) system.
We propose, for the first time in our knowledge, optimal placement of dispersion compensating units (DCUs) long-haul broadcast-and-selective optical networks. Our method can be used both non-slope and slope-compensated DCUs.