To cope with the explosive bandwidth demand, significant progress has been made in ITU-T standardization sector to define a higher-speed passive optical network (PON) 50 Gb/s line rate. Recently, G PON become mature gradually, which means it is time discuss beyond PON. For ensuring an acceptable power budget, will potentially use coherent technologies, can simultaneously promote applications of flexible multiple access such as time/frequency-domain (TFDMA). In this paper, we introduce...

The Volterra series transfer function (VSTF), in which the input-output relationship of a nonlinear system is represented by kernel functions, an elegant tool to model systems. inverse can be constructed analyzing VSTF. We propose new electronic nonlinearity compensation scheme based on show 1 dB improvement Q-factor with 256 Gb/s polarization-division-multiplexed 16-level quadratic amplitude modulation format, and 50% reduction complexity lowering processing rate.

We successfully realized layered decoding for LDPC convolutional codes designed application in high speed optical transmission systems. A relatively short code with 20% redundancy was FPGA-emulated a Q-factor of 5.7dB at BER 10−15.

We experimentally propose and demonstrate homodyne coherent detection in a short-distance data center interconnect with bidirectional fiber transmission. The transmitter the proposed system sends modulated signal continuous wave (CW) tone originating from same laser diode (LD) over 2 lanes of duplex to remote receiver for detection. Thus, this allows use an uncooled LD large linewidth reduces complexity digital processing (DSP) compared that classical system. A successful real-time...

It is foreseeable that the 100 Gb/s/ <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex-math notation="LaTeX">$\lambda$</tex-math></inline-formula> and beyond passive optical network (PON) will be required in future access networks to meet explosive growth of data traffic. The coherent systems could a promising solution for G PON. Coherent PON using digital subcarrier multiplexing (DSCM) can provide flexible bandwidth allocation...

In this paper, we highlight that it is inadequate to describe the rotation of state polarization (RSOP) in a fiber channel with 2-parameter description model, which was mostly used literature. This model may result problems demultiplexing (PolDemux) because RSOP actually 3-parameter issue will influence (SOP) optical signal propagating and different from SOP itself. Considering three examples models typically literature, provide an in-depth analysis reasons why cannot represent arise for...

In this paper, we experimentally compared the performance of bit-loading discrete multi-tone (DMT) and pre-equalized discrete-Fourier-transform spread (DFT-Spread) DMT in intensity modulation with direct detection (IM/DD) system for 2-km optical interconnect first time. Pre-equalization is applied to compensate high-frequency power fading wideband communication system. However, it remains be verified whether zero-forcing (ZF) channel estimation based complete pre-equalization can achieve...

A window-split frequency domain Kalman scheme is proposed in this paper for the equalization of large polarization mode dispersion (PMD) and ultra-fast rotation state-of-polarization (RSOP) which an extreme environment due to Kerr effect Faraday under lightning strike near fiber cables. In order carry out scheme, we give a simplified equivalent channel model as replacement general co-existence PMD RSOP. With model, can conduct compensation tracking RSOP time domain. half analytical empirical...

We successfully demonstrate a monolithic integrated dual-polarization in-phase/quadrature (IQ) modulator based on thin-film lithium niobate platform with silicon substrate, which consists of IQ modulators, spot-size converters, and polarization rotator combiner. When coupled maintaining fibers, the measured insertion loss is 12 dB. In addition, we experimentally achieve single-carrier 1.6 Tb/s net bitrate transmission.

We demonstrate the first real-time TFDMA coherent PON system with single-DAC and single-ADC ONUs, which can support up to 256 end users, peak line rates of 100/200 Gb/s in upstream/downstream, respectively.

We use 85-Gs/s digital-to-analog convertor (DAC), 85Gs/s analog-to-digital (ADC), commercial optoelectronic (OE) components with an overall electronic 3dB-bandwidth of less than 15GHz, and novel digital signal processing (DSP) algorithms implemented in CMOS to realize real time coherent transceiver operation at a record baud rate 61-Gbaud/s. Novel DSP approaches for mitigating narrow filtering effect is critical acquire data clock, improve modem performance. With transmitter pre-emphasis,...

In this paper, we experimentally demonstrate the transmission of 56 Gbaud four-level pulse amplitude modulation (PAM4) signal over 2-km single mode fiber (SMF) with intensity and direct detection (IM/DD) scheme, while bit-error-ratio (BER) PAM4 is under hard-decision forward error correction (HD-FEC) threshold 3.8 × 10-3. Linear pre-equalization implemented in transmitter side a 3-tap finite-impulse-response (FIR) filter to compensate for intersymbol interference (ISI) induced by system...

Passive optical networks (PONs) have been widely used in access to meet the requirement of rapidly growing data traffic. However, power budget worst network unit certainly limits maximum capacity PON. In this paper, we demonstrate a flexible-rate PON based on entropy-loaded clipping discrete multi-tone (DMT) for increasing capacity. Meanwhile, operation and simplified low-density parity-check (LDPC) assisted clipping-noise-cancellation (CNC) algorithm are proposed improve performance DMT...

We report first successful real-time self-homodyne coherent bi-direction transmission demonstration with 600-Gb/s DP-64QAM under un-cooled ~7-MHz linewidth DFB laser. A novel receiver is proposed to achieve automatic stabilization against polarization fluctuations of received LO.

To meet rapidly growing customer-traffic demands, passive optical networks (PONs) have been widely applied in access networks. However, one common imperfection of the commercially deployed PON is that maximum rate limited by power budget worst-case network unit (ONU). If current infrastructure to continue into future 100 Gb/s PON, ONU probably cannot requirement for data transmission. In this paper, we propose a new fine-granularity flexible-rate (FGFR) based on discrete multi-tone (DMT)...

We investigate DQPSK modulation combined with QC-LDPC coding. By applying iterative demodulation and soft-decision decoding, the differential decoding penalty is reduced by 2.05dB offering an attractive solution for coherent optical systems FEC.

We proposed optimal design of the post filter taps, for + sequence detector receiver. The is verified by detecting 56GBaud PDM-QPSK generated commercial CMOS DACs with 11GHz analog bandwidth. Only 2.6dB@1e-2 penalty observed.

In this paper, single carrier, polarization 200 Gbit/s signal transmission for intra-DCI is demonstrated. Enabling by pre-equalization, adaptive-notch-filter and look-up-table, the BER of 68.25 Gbaud PAM8 below 2.7×10−2 after 1-km SMF transmission.

Optical signal-to-noise ratio (OSNR) monitoring is indispensable for ensuring robust and flexible optical networks that provide failure diagnosis, dynamic lightpath provisioning modulation format adaptation. We propose experimentally demonstrate a low-cost, modulation-format-independent OSNR scheme utilizing reduced-complexity coherent receptions, electrical filtering radio frequency (RF) power measurements. By measuring the RF of coherently received baseband signals at three different...

We demonstrate real-time 24-Tb/s dense wavelength division multiplexing (DWDM) transmission over a 1910-km field-deployed G.654.E fiber link using 24 in-line wide-bandwidth Erbium-doped amplifiers with widened bandwidth of 6 THz in the cost-effective C-band. The DWDM system consists 60 100-GHz-spaced 400-Gb/s channels, modulated probabilistic constellation shaped polarization-division-multiplexed 16-point quadrature-amplitude modulation and fast-than-Nyquist shaping. This field trial shows...

Existing eccentric zonal water injection techniques cannot meet the requirements of separated layer injection, testing and adjustment in highly-deviated wells, because their low fishing success rate down-hole nozzles, efficiency connection between instruments precision flow test. A new concentric technique is proposed for wells. This adopts adjustment, i.e., test instrument concentrically connected with regulator, high connection. The regulator uses bridge-type channel to effectively...

We propose the first 100Gb/s fine-granularity flexible-rate PON based on discrete multi-tone and PAPR optimization. The proposed can achieve widest-range rate adjustment from 25Gb/s to with a granularity of ~ 50Mbit/s under optical power budget 36dB 26dB.

To cope with the extraordinary bandwidth demand, an optical access network based on point-to-multipoint (P2MP) topology has been widely applied. Recently, flexible transceivers have investigated to maximize power budget of units for increasing capacity passive networks. In this work, we experimentally demonstrate a low-cost, high-bandwidth P2MP solution multicarrier modulations and probabilistic constellation shaping technology by reusing 10G class directly modulated laser avalanche...