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A method to generate a monocycle UWB and doublet based on polarization modulation is proposed. Two Gaussian pulses with opposite polarity are phase-modulated to the orthogonal optical carriers with the polarization modulator (PolM). Then an appropriate group delay is introduced by polarization maintaining fiber (PMF), and a monocycle UWB is generated. The polarity of the generated monocycle UWB can...
We present a novel photonic approach based on heterodyne between a multiple-dispersed optical pulse and a continuous optical signal to generate tunable linearly chirped microwave waveform (LCMW) with large time-bandwidth product (TBWP). The carrier frequency of the generated waveform can be changed by tuning the frequency of continuous optical wave outputted from the tunable laser source (TLS),while...
We study traffic grooming with shared backup path protection (SBPP) in IP over elastic optical network (EON). Efficient heuristic algorithms are developed to enable joint spare capacity sharing in both IP and optical layer. Results show that two-layer joint spare capacity sharing can significantly improve network capacity utilization and IP-layer protection is more preferable from the perspective...
Dispersion studies demonstrate that waveguide layout can be used to enhance the bandwidth performance of multimode polymer waveguides for use in board-level optical interconnects, providing >40 GHz×m without the need for any launch conditioning.
Space-division-multiplexing, which can take many forms, provides low cost, high-bandwidth optical links for short-reach systems. We studied 2, 4 and 8-core multicore fiber (MCF) systems with associated connectors and fan-outs and achieved excellent BER performance.
We experimentally demonstrate a single-carrier 400G solution based on 51.25-GBaud PDM-32QAM signal at 6.15-b/s/Hz SE over 1200-km transmission distance. Training assisted pre-compensations and both transmitter and receiver based look-up table are employed to mitigate channel bandwidth constraint and component nonlinearity impairment.
We experimentally compare OFDM and Single-carrier modulation in a large-capacity optical-wireless signal delivery system at W-band. We conclude that OFDM is more suitable in a scenario of relatively short wireless distance and limited receiver bandwidth.
This paper reviews the technology used to enable commercial deployment of VCSELs at 25–28G and some of the device challenges that need to be addressed to enable the next generation of data rates.
We improve the C-RAN architecture for supporting high-speed railway communication. Results show that the improved architecture significantly reduces the bandwidth consumption brought by base station coordination and achieves higher system capacity.
V-band gapless OFDM RoF system with power detector down-conversion is proposed. We propose and successfully employ a novel Volterra nonlinear compensation to mitigate signal-to-signal beating interference, resulting in 22% data rate improvement with bit-loading algorithm.
We report on the non linear tolerance of multicarrier modulation versus the size of the WDM bandwidth. At high bandwidth efficiency, our results indicate that the gain of multicarrier is dependent on the WDM bandwidth.
We report on experimental results of 56-Gb/s OOK, PAM4 and 25-Gb/s DMT transmission with a high speed InGaAsP based monolithically integrated DFB-TWEAM, and evaluate different digital equalization implementations.
We realized a compact Silicon Nitride chip for optically reconfigurable time delays for K-band (17–22 GHz) radio satellite terminals beam-steering. Using 16-QAM 64-OFDM subcarriers we achieved 10 Gbps transmission capacity.
We proposed a novel elastic optical network architecture employing Grouped Routing that enhances frequency utilization. With a developed network design algorithm, necessary fiber number was further reduced +20% compared with conventional elastic optical path network.
We demonstrate a wideband OFDM transmission, using electrical IQ-mixing and signal combining. Transmission rates of 154.9 Gb/s over 2 km of SSMF were achieved with an IM/DD system on a single wavelength and a single polarization.
This paper proposes multi-dimensional resource mapping algorithms for inter-datacenter optical networks. Simulation results show that these proposed mapping algorithms can achieve better performance in blocking probability and revenue-to-cost ratio than the baseline algorithm.
50 Gb/s error-free data transmission and a −3-dB modulation bandwidth of 28.2 GHz are reported for high speed 850 nm oxide-confined VCSELs fabricated with an as-grown epitaxial structure without post-fabrication tuning of the photon lifetime.
Demand for increasing data rates in long haul, access, and wireless transport will with no doubt rely on the increased capacity and flexibility of coherent optical communications. Development of high performance monolithically integrated coherent receivers will redound in cost reduction and contribute to the widespread use of this technology in all the aforementioned scenarios. In this communication...
We evaluate the transmission performances of 28-Gb/s polar RZ PAM-N (N=2, 3, 4, and 5) upstream signals in 20-km long loopback SSMF link by using a directly-modulated RSOA and direct-detection receiver.
Dual-carrier SD-FEC gain sharing is utilized as a nonlinearity mitigation strategy for coherent super-channels in the context of submarine communications. Up to 0.68 dB benefit in Q and 50% more capacity is demonstrated.
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