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We propose and experimentally demonstrate a 3.5-bits/symbol/polarization 12QAMo modulation format. This new format is shown to out-perform both 8QAM and 16QAM formats in 200G transmissions over 15×80 km of SSMF impaired by cascaded WSS filtering.
We propose a novel carrier-assisted dual-polarization (CA-DP) modulation system with Stokes vector direct detection (SV-DD). Results show that 192-Gb/s DP-16QAM-OFDM signal can be received after 160-km using the proposed scheme with BER below 7% HD-FEC.
We investigate performances of two digital methods for suppression of clock tone leakages of an 80GS/s high-speed DAC supporting single-carrier 400G. A novel clock leakage mitigation technique is experimentally demonstrated for the first time.
We have successfully demonstrated 3 × 458-Gbit/s Optical Multi-band OFDM transmission over 160 km of SSMF with EDFA-only amplification at 50 GHz WDM spacing by utilizing narrowband optical filter.
In this paper we introduced two power-efficient CO-OFDM systems and showed that both systems can have ∼1-dB gain in receiving sensitivity (BER = 1e−3) and exhibit ∼1.1-dB benefit in Q factor after 9360-km transmission when compared with the regular PDM-CO-OFDM.
We demonstrate a hybrid QAM transmission technique for single-carrier ultra-dense wavelength division multiplexing (UD-WDM) systems. With 112-Gb/s per channel on 25-GHz grid, we found the hybrid 4 and 8QAM technique shows a much better performance than the pure 4QAM and exhibits an ∼0.9-dB OSNR benefit over the pure 8QAM.
We will review our recent works on the transmission of a high-speed (> 100Gb/s) direct-detection optical OFDM super-channel (DDO-OFDM-S) over the dispersion-unmanaged standard-single-mode-fiber (SSMF) link.
We have demonstrated an efficient scattered pilot channel tracking approach with a new polar-based intra-symbol frequency domain average (ISFA) for 16-QAM, 40-Gb/s PDM-CO-OFDM systems. This proposal could promise an relatively stable performance even under an rapidly time-varying environment.
We have demonstrated 7 × 463-Gbit/s Optical OFDM transmission over 960 km of SSMF with EDFA-only amplification at 100-GHz WDM spacing. It is confirmed that the intra-channel penalty is dominant compared to inter-channel penalty.
We will review the transmission and signal processing techniques (phase noise & IQ imbalance compensation) of our previously-proposed direct-detection optical OFDM super-channel (DDO-OFDM-S) over dispersion-unmanaged standard single mode fiber (SSMF) link.
We demonstrate a simple beat interference cancellation approach enabling higher spectral efficiency and better sensitivity (> 2 dB) for DDO-OFDM. The associated benefits of enhanced phase noise and PMD tolerances, as well as the impacts of diverse filter parameters, are also discussed.
We demonstrate the first digital laser-phase-noise (PN) mitigation approach for DDO-OFDM which applies a simple Wiener filter for adaptively estimating the statistical-unknown PN. The PN tolerance, in terms of the achievable fibre length, is about tripled with this PN mitigation technique.
We'll bring out our latest developments in improving the spectral efficiency and receiving sensitivity in a direct-detected OFDM transmission. The analytical model, numerical simulations and experimental results of the proposed architectures will be presented.
In this paper, we will review our latest developments in improving the spectral efficiency and receiving sensitivity in a direct-detected OFDM transmission system. An RF-tone assisted virtual single sideband (VSSB) OFDM modulation format is proposed to enhance the spectral efficiency in both electrical and optical domains for direct detected OFDM applications. The receiving sensitivity can be improved...
We proposed and analyzed an amplified self-coherent detection scheme by extracting and amplifying the optical carrier in an optical OFDM receiver. Simulation results exhibit about 6-dB OSNR sensitivity improvement over traditional direct-detected OFDM receiver.
We investigate the sensitivity bound, in terms of OSNR, for direct-detected OFDM systems in presence of optically-preamplified receivers, and show that OSNR requirement for DD-OFDM could theoretically reach that of CO-OFDM using the spectrally matched filters.
We demonstrate a polarization-time coding method for direct-detected OFDM, which provides the signal with immunity against both fibre CD and PMD effects. Further dynamic PTC method is introduced for trading the PMD tolerance with receiving sensitivity.
We show that the transmission distance is limited by the trade-off between the cyclic prefix and signal bandwidth for a direct-detected optical OFDM system. The maximum transmission distance with different QAM sizes and subcarrier numbers are also discussed.
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