A5090127053- Optical Network Technologies
- Advanced Photonic Communication Systems
- Photonic and Optical Devices
- Optical Wireless Communication Technologies
- Advanced Optical Network Technologies
- Error Correcting Code Techniques
- Advanced Fiber Laser Technologies
- Semiconductor Lasers and Optical Devices
- User Authentication and Security Systems
- Advanced Wireless Communication Techniques
- Telecommunications and Broadcasting Technologies
- Embedded Systems and FPGA Design
- Advanced Authentication Protocols Security
- Underwater Vehicles and Communication Systems
- IPv6, Mobility, Handover, Networks, Security
- Advanced Fiber Optic Sensors
- PAPR reduction in OFDM
- Satellite Communication Systems
- Video Coding and Compression Technologies
Beijing University of Posts and Telecommunications
2020-2024
State Key Laboratory of Information Photonics and Optical Communications
2023-2024
Fiberhome Technology Group (China)
2021
Technical University of Denmark
2021
The reliability of the space-to-Earth laser communication plays a crucial role in providing uninterrupted real-time services satellite optical networks. In traditional networks, is carried out using monolithic close proximity to target ground station. However, this approach heavily influenced by atmospheric environment. For instance, variations cloud thickness can cause fluctuations link quality communication, significantly reducing its reliability. This study proposes an innovative...
The real-time CCDM and inverse were realized in an FPGA. DM achieved a throughput of 16.8GBaud supported on-line reconfiguration to realize different entropies with fine granularity.
We demonstrate a real-time coherent optical receiver based on single field programmable gate array (FPGA) chip. To strike the balance between performance and hardware resources, we use clock recovery scheme using optimal interpolation (OI). The complexity of OI-based traditional schemes are compared discussed via offline digital signal processing. And 15GBaud single-polarization 16QAM transmission experiment under different received power FPGA-based is carried out to overall equalization...
A novel low-complexity combined resampling, retiming and equalizing (RRE) algorithm is proposed. The RRE uses a single FIR filter for thus lower the complexity. In numerical simulation, with an oversampling rate of 32/27, compared to traditional time-domain scheme 15-tap CMA equalizer frequency-domain based on 256-point FFT, lowers error vector magnitude (EVM) by 0.036 dB 0.043 complexity lowered 48.3% 31.9%, respectively. offline experiment, received optical power -35 dBm, EVM 0.26 0.36 dB....
The impacts of limited bandwidth on the nonlinear transmission performance are investigated by employing a truncated probabilistic shaped 64-ary quadrature amplitude modulation (TPS-64QAM) and uniformly distributed 16-ary (UD-16QAM) over bandwidth-limited 75-GHz spaced 25-Tb/s (60 × 416.7 Gb/s) 6300-km system. In terms measured optimal launch power, theoretical analyses show that 0.4-dB improvement could be introduced UD-16QAM with respect to TPS-64QAM without bandwidth. However, contrary...
We investigate the parallelized performance of conventional Kramers-Kronig (KK) and without digital up-sampling KK (WDU-KK) receivers in a 112-Gbit/s 16-ary quadrature amplitude modulation (16-QAM) system over 1440-km standard single-mode fiber (SSMF). A joint overlap approach bandwidth compensation filter (OLA-BC) architecture is presented to mitigate edge effect caused by Hilbert transform Gibbs phenomenon induced FIR filter, respectively. Moreover, computational complexity OLA-BC based...
The Hilbert transform links the log-magnitude and phase of field modulated signals as long minimum condition is satisfied in Kramer-Kronig (KK) receiver. In discrete-time signal processing, generally replaced by a finite impulse response (FIR) filter to reduce computational complexity, that so-called FIR (HT-FIR) filter. performance HT-FIR extremely important, in-band flatness, ripple, group delay, Gibbs phenomenon, edge effect, which indeed impair retrieval. Hence, we investigate four...
Atmospheric turbulence is a crucial factor affecting the performance of space optical communication systems. The mode diversity considered an effective compensation method. In system, coherent combining algorithms are needed to combine received signals from multiple modes counteract effects turbulence. this paper, we investigate 3 based on selection (SC) algorithm in 2.5 GBaud QPSK real-time back-to-back transmission system. We simulate with dynamic changes and calculate bit error rate (BER)...
This paper presents a two-stage frequency offset estimation (FOE) algorithm to compensate for Doppler shift (DFS) without local oscillator (LO) laser tuning. By increasing the sampling rate 12 samples per symbol (SPS) and using small number of pilots, compensation range is increased from ±Rs/8 conventional 4-th power FOE ±12Rs, where Rs rate. In offline experiment 2.5GBaud QPSK coherent optical communication system, this compensates simulated DFS, which ranges -8GHz 8GHz. The scheme achieves...
This Letter presents a real-time coherent receiver using digital signal processing (DSP)-assisted automatic frequency control (AFC) to compensate for the Doppler shift (DFS). DFS compensation range of ±8 GHz and shifting rate 33 MHz/s are demonstrated in an FPGA-based 2.5 Gbaud QPSK optical system. The experimental results indicate that scheme achieves sensitivity -47 dBm at bit error (BER) 2E-4. power penalty induced by is less than 1 dB.
In this paper, a detuned distribution enabled polar coded probabilistic shaped 64-QAM is proposed and experimentally investigated over 36-Tb/s (45×800-Gb/s) 2100-km transmission system at the spectral efficiency of 8-bit/s/Hz.
We experimentally demonstrate an on-chip coherent combiner utilizing the COBYLA algorithm, resulting in a 3.15 dB enhancement synthesis power. A 36-Gbit/s quadrature phase-shift-keying communication link carried by is demonstrated.
We demonstrate real-time flexible coherent optical receiver based on a single FPGA chip, which uses set of digital signal processing (DSP) algorithms with low complexity to realize the 15GBaud single-polarization QPSK and 16QAM signals under control computer. compare its hardware resources consumption those implementations that use same DSP algorithm but only enable for modulation format (QPSK or 16QAM), find former has no significant increase in most resources. A back-to-back experiment...
A novel diversity combining scheme, in conjunction with the complex-valued decision-directed least mean square (CV-DD-LMS) algorithm, is evaluated, and a real-time experimental validation presented. This proposed scheme employs CV-DD-LMS algorithm to concurrently perform beam combination carrier phase recovery (CPR), thereby effectively reducing overall complexity of digital signal processing. Furthermore, numerical simulation, under low signal-to-noise ratio (SNR), utilizing avoids cycle...
Kramers-Kronig (KK) receiver shows strong feasibility since the phase can be extracted from detected intensity through Hilbert transform (HT).To reduce complexity and make HT more suitable for practical KK system, approximated as finite impulse response (FIR) filter, i.e. HT-FIR filter.However, Fourier series expansion of filter suffers oscillations around discontinuities further results in an unsatisfactory inband flatness, which is so-called Gibbs phenomenon.In experiment simulation, we...
We propose an improved parallel KK receiver based on heading-frame architecture and bandwidth compensation. By adopting the proposed scheme, a 112-Gbit/s 16-QAM signal is successfully transmitted over 1440-km SSMF.
This study compared the Many-to-One (MTO) Mapping algorithms and Hierarchical Distribution Matching (HiDM) under TPS-64QAM modulation for first time. MTO exhibits better post bit error rate performance at low SNR to HiDM, but performs worse high SNR. The comparison on FPGA platform shows that has approximately 1/13 of power HiDM.
A real-time low-complexity pilot-assisted decision-based cycle slip elimination (PAD-CSE) scheme is investigated over an FPGA-based coherent optical communication system, which exhibits enhanced 1.4 dB improvement in ROP sensitivity under 15GBaud QPSK OBTB systems.
Comparisons between TPS-64QAM and UD-16QAM are executed employing bandwidth-limited transmission systems. Results show that 0.7 -dB OSNR sensitivity improvements, 10-dB optimal launch power improvements 350-km maximum-reach could be introduced by compared to UD-16QAM.
800-Gb/s/lane based 36-Tb/s 3150-km transmission in a 100-GHz spaced WDM configuration employing silicon-based IC-TROSA C-Band at the spectral of 8-bit/s/Hz is successfully demonstrated by utilizing 90-GBaud PS-64QAM signal, contributing to capacity-distance product 113.4-Pb/sxkm, which new record for transmissions single core fibers.