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We report on the experimental comparison of the non linear tolerance of multicarrier and single-carrier modulations in WDM scenarios while varying the bandwidth efficiency. Non linear tolerance improvement of multicarrier approach decreases with bandwidth efficiency.
We review progress in the design, fabrication and characterisation of hollow core photonic band gap fibres that have led to the production of low-latency data transmission fibres of >10 km length with 200nm bandwidth and losses at the 5dB/km level.
In this presented work we compare the duobinary and Modified Duobinary (MDB) modulation in both Return to Zero (RZ) & Non Return to Zero (NRZ) cases at 40Gbps single channel transmission in the presence of linear & nonlinear effects. For both the cases we optimized the optical filter bandwidth to get the maximum Q value. Analysis reports that the performance of duobinary NRZ outperforms RZ...
We propose a novel unipolar encoding technique for orthogonal frequency-division multiplexing (OFDM) that increases the bandwidth efficiency by 33% and reduces computational complexity by 50% compared to conventional intensity modulation/direct detection (IM/DD) OFDM systems.
We present a modified version of adaptive digital backpropagation based on EVM metric, and numerically access its performance in a flexigrid WDM scenario.
A multiple-layer-overlay (MLO) modulation format is employed for a 14-km optical fiber link and an enhanced spectral efficiency of 2.36 bits/s/Hz is achieved by multiplexing 3-layer signals with each layer carrying a 2-Gbit/s QPSK signal.
We report a new and practical scheme of using optical time-stretch with Gerchberg Saxton (GS)-like algorithm for ultrafast real-time phase retrieval, with the phase error significantly suppressed even at a wide signal bandwidth.
Silicon photonics interconnect technology can potentially deliver computing systems energy efficient data movement with extreme bandwidth densities. We discuss the first complete experimental silicon photonic interconnected hardware-software implementation that demonstrates the system-level performance benefits.
The joint spectra of the two type-II phase-matchings that add coherently to give rise to the generation of polarization-entangled photon pairs in a poled fiber are measured. Optimal parameters are identified for the generation of high-quality entanglement.
A two-dimensional temporal compressive sampling microscopic camera with a frame rate of 500 kHz is demonstrated in this paper, achieving higher frame rate and lower sampling bandwidth than the conventional compressive sampling cameras.
In this paper, the system level performance of uplink transmission in the split-PHY processing (SPP) architecture is evaluated. The SPP architecture splits the PHY functions of the base station so that some PHY functions are implemented on the remote radio head (RRH). Compared to the centralized radio access network (C-RAN) architecture with common public radio interface (CPRI), the SPP architecture...
Internet traffic has been growing year-after-year for decades, but processing all that traffic through traditional IP routers has become an obstacle to further expansion. Router bypass has been introduced recently to overcome capacity limitations and processing costs of IP routers. With router bypass, a portion of traffic is provisioned to bypass the traditional router and is instead switched by the...
Digital Signal processing is going on spreading from long reach systems to short reach systems like inter-/intra-data center systems. The cost requirements for short reach systems are more stringent than requirements for long reach systems. And digital signal processing is attractive for cost reduction of optical and electrical components. In this paper, digital signal processing, especially Discrete...
We report the fabrication of a record 11km length of photonic bandgap fiber supporting >200nm bandwidth with longitudinally uniform loss of ≈5dB/km at 1560nm and demonstrate error-free, low-latency, direct-detection 10Gbit/s transmission across the entire C-Band.
The bandwidth capacity of 50/125 µm multimode fiber is extended by using four VCSELs with wavelengths coarsely separated at 30nm and with each wavelength operating at 40Gb/s. All four wavelengths achieve BER <1E–12 at 100m.
We demonstrate WDM transmission of 75-Gbaud PDM-16QAM signals over 1,920 km. InP-based high-speed and compact MUX-DAC integrated modules (bandwidth exceeds 40 GHz) enable the long haul transport of 1-Tb/s superchannels composed of just two subcarriers.
We demonstrate how maximum entropy (MaxEnt) allocation strategies can optimally determine links within a flexgrid elastic optical network requiring multiple fiber-pairs to support 100% capacity growth with 34.3% improvement in the uniformity of spectrum allocations.
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.
We experimentally demonstrate a bandwidth-efficient mobile fronthaul system, where 36 E-UTRA-like wireless signals, six for each standardized bandwidth, 1.4/3/5/10/15/20 MHz, are aggregated in a single wavelength channel, achieving >30 dB loss budget for a 20-km SSMF link.
We demonstrate novel re-optimization design techniques for realizing agile and seamless service migration with minimum connection disruptions. We also show the effectiveness of our integer linear programming based approach through network simulations.
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