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Fiber impairment mitigation of an unprecedented 24 WDM channel count is demonstrated in a transmission optimized fiber link using 12 phase conjugations. An 8dB higher nonlinearity threshold is measured for WDM 1.1Tb/s DP-QPSK signals.
The time domain hybrid QAM enabled flexible transceiver is proposed to adaptively optimize the transmission performance in DWDM systems with cascaded ROADMs. Comprehensive performance investigations are conducted for both fixed and flexible grid systems.
In this paper we overview our research activities on the Routing and Spectrum Assignment (RSA) in optical metro ring networks with flexible grid and distance-adaptive transceivers. We consolidate our existing mathematical models of the RSA problem in a single comprehensive formulation that can work under very diverse assumptions (variable-vs. fixed-spectrum transceivers, regeneration vs. no regeneration,...
The paper presents a hybrid orthogonal frequency division multiplexing (OFDM) — wavelength division multiplexing (WDM) visible light communication (VLC). Direct detection is adopted in place of complex digital signal processing such as channel estimation and channel equalization, or even forward error corrections. Generic red, green and blue light emitting diodes (LED) are used for high-speed WDM...
Proposed in paper is a clustered LR-PON with hierarchical architecture and multi-dimension DBA, applying MPCP and PPPoE to tree topology and star topology. The DBA scheme is based on dimensions of wavelength, frequency and time.
We describe our recent progress on a linear optical sampling technique. Thanks to broad bandwidth and direct complex amplitude accessibility, the technique enables WDM signal demultiplexing by digital signal processing and laser phase noise characterization.
We propose a load balancing algorithm to manage data transmission over multiple wavelengths in TWDM-PON. Each wavelength is controlled to be in the balanced load state or lightly-loaded state. Analysis and test demonstrate salient results.
Critical data transmissions are often scheduled hours or days in advance of the actual acquirement of network resources, allowing for efficient allocation and scheduling among a set of competing or temporally overlapping lightpath demands. Many periodic applications may not only desire service at some future time, but may further require repeatable and predictable scheduling services. Typically, such...
Packet-Optical Transport Network (POTN) technologies and architectures integrate the functional switching capability of WDM wavelengths, Ethernet via various protocols, OTN/ODU as well as TDM. From a telecommunication service provider's view, it is a great advantage to replace various multiple-layer network equipment with the unified equipment using POTN technologies. On the other hand, it is a drawback...
We propose a new load-dependent reach maximization procedure in dispersion-uncompensated optical networks with coherent detection, and estimate the electro-optic regenerations savings with respect to the standard full-load reach approach.
We propose and demonstrate a parametric frequency comb architecture with dynamically reconfigurable carrier frequency grid for superchannel and flex-grid elastic transmitters. Performance of 16-QAM signal generation was characterized for 100 GHz, 25 GHz, 12.5 GHz and 6.25 GHz frequency spacing.
This invited tutorial summarizes the current research situation for flexgrid networks, describing the components required, issues to be solved, increased network capacity and broader flexibility and techno-economic benefits.
This paper will study all-optical Nyquist filtering to explore its possibility for ultra-coarse granular yet flexible, efficient optical networks such as future inter-datacenter networks. We will describe key technologies including transmission, add/drop multiplexing, and spectral defragmentation of Nyquist OTDM-WDM signals.
We experimentally demonstrate a 12×10Gb/s bi-directional hybrid SSMF and FSO PHY PON recurring to 6.25 GHz grid, Nyquist shaping and frequency-shifting. Performance is evaluated over a 30.5 dB ODN with Hybrid splitting and coexistence with TWDM-PON.
Possible device configurations for the next-generation passive optical network (NG-PON2) are reviewed on the basis of system requirements. The most significant issue is how to cost-effectively implement a tunable function in optical components because NG-PON2 introduces a wavelength division multiplexing.
We demonstrate a coherent OFDM-PON based on a simplified coherent receiver, which exploits a DFB local oscillator without phase/frequency locking. We achieve ultra-narrow channel spacing (Δν = 1.6 GHz) and high-power budget (43 dB/35 dB) for 1.25/10 Gb/s.
The impact of traffic asymmetry on usage of multiflow transponders (MFTs) in elastic optical networks with dedicated path protection is examined. Based on experiments performed on European network, acceptable costs of MFTs, with respect to 100G WDM transponders, are evaluated.
This paper presents WDM transmission at 2μm over 1.15km of HC-PBGF with wavelength channels selected to span a 36.3nm waveband. A total capacity of 81Gbit/s was achieved using 4×12.5Gbit/s NRZ-OOK external modulation and 4×7.7Gbit/s 4-ASK Fast-OFDM direct modulation signals.
A 560 Gb/s (7×80 Gb/s Nyquist spaced PDM-16QAM) superchannel achieving 6.95 b/s/Hz spectral efficiency is transmitted over 253.4 km SMF-28® ULL fiber using only EDFA pre-amplification and full-field nonlinear back-propagation, corresponding to a record SE-distance product of 1761.1 b/s/Hz·km.
The recent high-bandwidth demand multimedia applications have driven the need for higher bandwidth and faster access network architecture. However, conventional single-channel Ethernet Passive Optical Networks (EPONs) cannot fully realize and satisfy the multimedia demands. Wavelength Division Multiplexing (WDM) EPON is one of the best solutions for supporting the converged triple-play services such...
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