1,721,058 research outputs found
Tolerance to laser frequency deviation of Nyquist-WDM and Time-Frequency-Packing modulation formats
No full textNyquist-WDM and Time-Frequency-Packing tolerance to ICI arising from laser frequency deviation from nominal value is investigated through simulations. Performance comparison at 6.35bit/s/Hz Spectral Efficiency shows that TFP exhibits higher robustness to ICI and OSNR degradation
Impact of Optical and Electrical Narrowband Spectral Shaping in Faster than Nyquist Tb Superchannel
No full textThe impact over system performances of narrowband spectral shaping for time-frequency packed faster than Nyquist Tb/s superchannels is evaluated. Comparison between optical and electrical filtering under the presence of partially overlapping neighbor channels is presented and optimal values for filter bandwidth are determined for different filter profiles
Spectral-Efficient Flexible Optical Multicasting in a Periodically Poled Lithium Niobate Waveguide
No full textTime-frequency packed VCSEL-based IM/DD transmission for WDM access networks
No full textA commercial 4G 1550nm-VCSEL is employed for wavelength- and polarization-independent 14Gb/s optical transmission up to 25km of SMF, thanks to the time-frequency packing technique that is, for the first time, employed in an IM-DD system
Network Authentication, Identification, and Secure Communication through Optical Physical Unclonable Function
No full text
On the performance of advanced integrated microring filters for switching applications in next-generation elastic optical networks
No full textWe investigate the use of integrated advanced microring resonator-based sum-difference all-pass optical filters for switching applications in circuit-switched elastic optical networks. A practical design taking into account optical losses accordingly to typical reported values for strip waveguides in silicon-on-insulator technology is considered. By incorporating tuning elements (i.e., standard phase shifters), three different synthetized elliptic filters are emulated in the same physical structure showing the potential in terms of bandwidth configurability of the architecture. Practical filter design rules for standard silicon-on-insulator single-mode strip waveguides are also discussed. Beside possible advantages in terms of reduced fabrication costs, simulations performed on Nyquist PM-QPSK signals with different channel capacities over 50, 37.5 and 25 GHz frequency slots suggest that the proposed structure can achieve similar or better performance than commercial spectrum selective switch filters
Method of transmitting communications traffic, transmitter and communications transmission system
Full text linkA method (10) of transmitting communications traffic, the method comprising steps of receiving a sequence of communications traffic bits (12); and mapping the sequence of communications traffic bits onto a respective one of a plurality of transmission symbols for transmission during a symbol time (14). Each transmission symbol is identified by a respective first symbol identifier indicative of a respective one or more of a plurality, M, of wavelengths for a transmission signal and a respective second symbol identifier indicative of a respective one or more of a plurality, N, of optical fibres on which to transmit the transmission signal
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