Dr. Ze Dong Profile

Dr. Ze Dong

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Proceedings Article | 5 February 2013 Paper

Field trial for the mixed bit rate at 100G and beyond

Jianjun Yu, Zhensheng Jia, Ze Dong, Hung-Chang Chien

Proceedings Volume 8647, 864703 (2013) https://doi.org/10.1117/12.2008342

KEYWORDS: Digital filtering, Digital signal processing, Receivers, Wavelength division multiplexing, Optical filters, Modulation, Channel projecting optics, Orthogonal frequency division multiplexing, Polarization, Multiplexing

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Successful joint experiments with Deutsche Telecom (DT) on long-haul transmission of 100G and beyond are demonstrated over standard single mode fiber (SSMF) and inline EDFA-only amplification. The transmission link consists of 8 nodes and 950-km installed SSMF in DT’s optical infrastructure with the addition of lab SSMF for extended optical reach. The first field transmission of 8×216.4-Gb/s Nyquist-WDM signals is reported over 1750- km distance with 21.6-dB average loss per span. Each channel modulated by 54.2-Gbaud PDM-CSRZ-QPSK signal is on 50-GHz grid, achieving a net spectral efficiency (SE) of 4 bit/s/Hz. We also demonstrate mixed data-rate transmission coexisting with 1T, 400G, and 100G channels. The 400G uses four independent subcarriers modulated by 28-Gbaud PDM-QPSK signals, yielding the net SE of 4 bit/s/Hz while 13 optically generated subcarriers from single optical source are employed in 1T channel with 25-Gbaud PDM-QPSK modulation. The 100G signal uses real-time coherent PDM-QPSK transponder with 15% overhead of soft-decision forward-error correction (SD-FEC). The digital post filter and 1-bit maximum likelihood sequence estimation (MLSE) are introduced at the receiver DSP to suppress noise, linear crosstalk and filtering effects. Our results show the future 400G and 1T channels utilizing Nyquist WDM technique can transmit long-haul distance with higher SE using the same QPSK format.

Proceedings Article | 4 February 2013 Paper

Seamless integration of 100-G wire line and 100-GHz wireless link system

Ze Dong, Jianjun Yu, Xinying Li, Nan Chi

Proceedings Volume 8645, 86450D (2013) https://doi.org/10.1117/12.2008211

KEYWORDS: Digital signal processing, Receivers, Polarization, Transmitters, Heterodyning, Modulation, Radio optics, Antennas, Signal detection, Modulators

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In this invited paper, we experimentally demonstrate a seamlessly integrated fiber-wireless system that delivers 108-Gb/s signal through 80-km fiber and 1-m wireless transport over free-space at 100 GHz, adopting polarization-divisionmultiplexing quadrature-phase-shift-keying (PDM-QPSK) modulation and heterodyning coherent detection. The X- and Y-polarization baseband components of the optical PDM-QPSK are simultaneously up-converted to 100-GHz wireless carriers by optical polarization-diversity heterodyne beating, and then independently transmitted and received by two pairs of transmitter and receiver antennas, which forms a 2x2 multiple-input multiple-output (MIMO) wireless link. At the wireless receiver, two-stage down conversion is performed with firstly done in analog domain based on balanced mixer and sinusoidal radio frequency (RF) signal, and then in digital domain based on digital signal processing (DSP). MIMO signal de-multiplexing combined with optical polarization multiplexing and free space MIMO crosstalk is realized by constant modulus algorithm (CMA) in digital signal processing (DSP) part at the receiver. The bit-error ratio (BER) for the 108-Gb/s PDM-QPSK signal is less than the pre-forward-error-correction (pre-FEC) threshold of 3.8x10^-3 after both 1-m wireless delivery at 100 GHz and 80-km single-mode fiber-28 (SMF-28) transmission. To our knowledge, this is the first demonstration to realize 100-Gb/s signal delivery through both fiber and wireless links at 100GHz.

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