The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Wavelength tuning in a single mode parity-time (PT) symmetric semiconductor microring laser is demonstrated. Stable continuous tuning over a spectral range of 4 nm has been obtained at telecom wavelengths by adjusting the ambient temperature.
We present the modeling of a laterally coupled twin-stripe laser for boosting the modulation bandwidth far beyond relaxation frequencies. The 3dB-modulation bandwidth is increased to be doubled thanks to optical feedback in laterally coupled cavities.
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 report on the design, fabrication, and characterization of photonic crystal phase modulators on epitaxial barium titanate thin films. Modeling indicates that >50 GHz bandwidth and 0.25 V·cm voltage-length product are achievable in sub-millimeter long devices.
We experimentally demonstrate apodized focusing fully etched sub-wavelength grating couplers for the transverse electric (TE) mode. An insertion loss of 4.2 dB, 1-dB bandwidth of 36 nm, and back reflection of −24 dB have been obtained.
An algorithm for characterizing attosecond EUV pulses which is not bandwidth-limited, requires no interpolation of the experimental data, and makes no approximations beyond SFA while fully retrieving both the IR and EUV pulses is introduced.
We present performance analysis of chirped laser dispersion spectroscopy (CLaDS) under shot noise limited conditions. A comparison to direct laser absorption spectroscopy (DLAS) is also provided.
Integrated signal processors offer potential high resolution, tunability and programmable microwave photonic signal processing. The high performance integrated FIR/IIR signal processers have been presented, accompanying an application for the full-band microwave photonic frontends.
An offset-free frequency comb generated by difference frequency mixing is established and characterized. mHz-level direct locking of the repetition rate to 85Rb and reference-limited linewidth narrowing via an extra-cavity electro-optic modulator are demonstrated.
We present a modified version of adaptive digital backpropagation based on EVM metric, and numerically access its performance in a flexigrid WDM scenario.
Power scaling of narrow-linewidth thulium-doped fiber superfluorescent source with wavelength tunable from 1940∼2010nm is reported. The all-fiber superfluorescent source yielded 364W of output power at central wavelength of 1980nm with 3dB spectral bandwidth of 1.9nm.
An integrated photonic reservoir computing based on hierarchical time-multiplexing structure is proposed by numerical simulations. Error rates of 2.2∼6.5% for chaotic time series prediction are achieved with sample rate of 1.3∼0.4Gbps and bandwidth of 40∼10GHz.
Can thermal light be represented by a mixture of single pulses? It cannot; only a modified mixture can yield the correct first-order correlation function at equal space-points. Still, this fails to reproduce higher orders.
We demonstrate complex mid-IR spectral phase and amplitude shaping spanning 2.5–5 μm, based on down-conversion of a shaped near-IR source, using chirped-pulse adiabatic difference frequency generation. The technique can be extended to multi-octave bandwidths.
An all-optical programmable signal processor has been proposed and experimentally demonstrated. The record resolution is measured to be 145 MHz and the processing range can be enlarged by a channelized filter to > 100 GHz.
High-power (110mW) mid-IR output suitable for ultra-broadband frequency comb generation was produced in a low-threshold (20mW) subharmonic GaAs optical parametric oscillator that was synchronously pumped (175MHz) by a compact 0.5-W femtosecond Cr:ZnS (2.38μm) oscillator.
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 experimentally demonstrate simultaneous phase noise suppression and automatically locked tunable homodyne reception for 20-Gbaud QPSK signal. The phase noise deviation can be reduced by a factor of ∼3. Open I/Q eyes are obtained after the noise mitigation.
The generation and stabilization of high quality mm- and THz-waves via extraction of two lines from a fs-laser, with frequencies up to 3 THz, line width below 1 Hz and phase noise of −134 dBc/Hz is presented.
Using high nonlinear enhancement in a CMOS compatible microring resonator incorporated in a SOA based nonlinear loop-mirror laser architecture, we observe passive mode-locking at extremely-low power levels generating 570ps pulses at a 14.8MHz repetition rate.
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.