Abstract Lithium niobate on insulator (LNOI) technology is revolutionizing the lithium industry, enabling higher performance, lower cost and entirely new devices applications. The availability of LNOI wafers has sparked significant interest in platform for integrated optical applications, as offers attractive material properties niobate, while also offering stronger confinement a high element integration density that driven success more mature silicon nitride (SiN) photonics platforms. Due...

We demonstrate photonic RF phase encoding based on an integrated micro-comb source. By assembling single-cycle Gaussian pulse replicas using a transversal filtering structure, encoded waveforms can be generated by programming the weights of wavelength channels. This approach eliminates need for signal generators carrier generation or arbitrary waveform generation. A large number wavelengths up to 60 were provided microcomb source, yielding high compression ratio 30. Reconfigurable rates...

We report a photonic microwave and RF fractional Hilbert transformer based on an integrated Kerr micro-comb source. The source has free spectral range (FSR) of 50GHz, generating large number comb lines that serve as high-performance multi-wavelength for the transformer. By programming shaping according to calculated tap weights, we achieve both arbitrary orders broad operation bandwidth. experimentally characterize amplitude phase response different perform system demonstrations real-time...

Micro-combs [1 - 4], optical frequency combs generated by integrated micro-cavity resonators, offer the full potential of their bulk counterparts [5,6], but in an footprint. The discovery temporal soliton states (DKS dissipative Kerr solitons) [4,7-11] as a means modelocking microcombs has enabled breakthroughs many fields including spectroscopy [12,13], microwave photonics [14], synthesis [15], ranging [16,17], quantum sources [18,19], metrology [20,21] and more. One most promising...

We report a photonic radio frequency (RF) fractional differentiator based on an integrated Kerr micro-comb source. The source has free spectral range (FSR) of 49 GHz, generating large number comb lines that serve as high-performance multi-wavelength for the differentiator. By programming and shaping according to calculated tap weights, arbitrary orders ranging from 0.15 0.90 are achieved over broad RF operation bandwidth 15.49 GHz. experimentally characterize frequency-domain amplitude phase...

We report a photonic-based radio frequency (RF) arbitrary waveform generator (AWG) using soliton crystal micro-comb source with free spectral range (FSR) of 48.9 GHz. The comb provides over 80 wavelengths, or channels, that we use to successfully achieve shapes including square waveforms tunable duty ratio ranging from 10% 90%, sawtooth slope 0.2 1, and symmetric concave quadratic chirp an instantaneous sub good agreement between theory experiment, validating the effectiveness this approach...

Abstract Optical artificial neural networks (ONNs)—analog computing hardware tailored for machine learning—have significant potential achieving ultra‐high speed and energy efficiency. A new approach to architectures ONNs based on integrated Kerr microcomb sources that is programmable, highly scalable, capable of reaching speeds proposed here. The building block the ONN—a single neuron perceptron—is experimentally demonstrated reaches a high single‐unit throughput 11.9 Giga‐FLOPS at 8 bits...

We demonstrate a photonic RF integrator based on an integrated soliton crystal micro-comb source. By multicasting and progressively delaying the input signal using transversal structure, is discretely. Up to 81 wavelengths are provided by microcomb source, which enable large time-bandwidth product of 81. Our approach also features high degree reconfigurability. simply adjusting value dispersion (i.e., length dispersive fibre), integration time window resolution can be reconfigured...

We demonstrate an RF photonic fractional Hilbert transformer based on integrated Kerr micro-comb source featuring a record low free spectral range of 48.9 GHz, yielding 75 microcomb lines across the C-band. By programming and shaping comb according to calculated tap weights, we that can achieve tunable bandwidths ranging from 1.2 15.3 switchable centre frequencies baseband 9.5 arbitrary orders. experimentally characterize amplitude phase response bandpass lowpass transformers with 90...

Soliton crystal micro-combs are powerful tools as sources of multiple wavelength channels for radio frequency (RF) signal processing. They offer a compact device footprint, large numbers wavelengths, very high versatility, and wide Nyquist bandwidths. Here, we demonstrate integral order RF processing functions based on soliton micro-comb, including Hilbert transformer first- to third-order differentiators. We compare contrast results achieved the tradeoffs involved with varying comb spacing,...

Abstract Microwave transversal filters, which are implemented based on the filter structure in digital signal processing, offer a high reconfigurability for achieving variety of processing functions without changing hardware. When using microwave photonic (MWP) technologies, also known as MWP they provide competitive advantages over their electrical counterparts, such large operation bandwidth, strong immunity to electromagnetic interference, and low loss when signals at frequencies. Recent...

We report nonlinear measurements on 80microm silicon photonic crystal waveguides that are designed to support dispersionless slow light with group velocities between c/20 and c/50. By launching picoseconds pulses into the comparing their output spectral signatures, we show how self phase modulation induced broadening is enhanced due light. Comparison of numerical simulations pulse propagation elucidates contribution various effects determine shape waveguide transfer function. In particular,...

We demonstrate optical performance monitoring of in-band signal to noise ratio (OSNR) and residual dispersion, at bit rates 40Gb/s, 160Gb/s 640Gb/s, using slow-light enhanced third harmonic generation (THG) in a compact (80microm) dispersion engineered 2D silicon photonic crystal waveguide. show that there is no intrinsic degradation the enhancement processing 640Gb/s relative this device should operate well above 1Tb/s. This work represents record 16-fold increase speed for device, opens...

Using Fourier optics, we retrieve the wavevector dependence of third-harmonic (green) light generated in a slow silicon photonic crystal waveguide.We show that quasi-phase matching between thirdharmonic signal and fundamental mode is provided this geometry by coupling to continuum radiation modes above line.This process sustains generation with relatively high efficiency substantial bandwidth limited only window mode.The results give us insights into physics nonlinear presence strong...

We demonstrate silicon-chip-based instantaneous chromatic dispersion monitoring (GVD) for an ultrahigh bandwidth 640 Gbit/s differential phase-shift keying (DPSK) signal. This scheme is based on cross-phase modulation in a highly nonlinear silicon nanowire. show that two-photon absorption and free-carrier-related effects do not compromise the GVD performance, making our reliable on-chip CMOS-compatible, all-optical, real-time impairment approach up to Terabit/s DPSK signals.

We demonstrate a terahertz bandwidth silicon nanowire based radio-frequency spectrum analyzer using cross-phase modulation. show that the device provides accurate characterization of 640Gbaud on-off-keyed data stream and its potential for optical time-division multiplexing optimization performance monitoring ultrahigh speed signals on chip. analyze impact free carrier effects our device, find efficiency is not reduced by two-photon or free-carrier absorption, nor accuracy compromised cross-chirp.

We present a summary of our recent experiments showing how various nonlinear phenomena are enhanced due to slow light in silicon photonic crystal waveguides. These processes include self-phase modulation (SPM), two-photon absorption (TPA), free-carrier related effects, and third-harmonic generation, the last effect being associated with emission green visible light, an unexpected phenomenon silicon. demonstrations exploit waveguides engineered support modes range group velocities as low c/50...

We experimentally investigate four-wave mixing (FWM) in short (80 μm) dispersion-engineered slow light silicon photonic crystal waveguides. The pump, probe and idler signals all lie a 14 nm wide low dispersion region with near-constant group velocity of c/30. measure an instantaneous conversion efficiency up to -9dB between the continuous-wave probe, 1W peak pump power 6 pump-probe detuning. This is found be considerably higher (>10 × ) than that Si nanowire ten times larger. In addition, we...

Optical frequency combs can potentially provide an efficient light source for multi-terabit-per-second optical superchannels. However, as the bandwidth of these multi-wavelength sources is increased, it result in low per-line power. amplifiers be used to overcome power limitations, but accompanying spontaneous noise degrade performance systems. To this, we demonstrate wideband reduction comb lines using a high-Q microring resonator whose resonances align with lines, providing tight filtering...

We report world record high data transmission over standard optical fiber from a single source. achieve line rate of 44.2 Terabits per second (Tb/s) employing only the C-band at 1550nm, resulting in spectral efficiency 10.4 bits/s/Hz. use new and powerful class micro-comb called soliton crystals that exhibit robust operation stable generation as well intrinsic that, together with an extremely low spacing 48.9 GHz enables very coherent modulation format 64 QAM. error free across 75 km lab...

Signal processing has become central to many fields, from coherent optical telecommunications, where it is used compensate signal impairments, video image processing. Image particularly important for observational astronomy, medical diagnosis, autonomous driving, big data and artificial intelligence. For these applications, traditionally mainly been performed electronically. However these, as well new those involving real time processing, are creating unprecedented demand ultrahigh...

We show a thermally stable self-injection DFB laser lock to microring resonator system, increasing the range of temperature for which stays within 100 MHz target frequency by factor 100. By including amplification in feedback loop, per-laser power dedicated this locking was reduced. further added 2.2 km fiber spool explore remote performance system.

Feedback control plays a crucial role in improving system accuracy and stability for variety of scientific engineering applications. Here, we theoretically experimentally investigate the implementation feedback microwave photonic (MWP) transversal filter systems based on optical microcomb sources, which offer advantages achieving highly reconfigurable processing functions without requiring changes to hardware. We propose four different methods including (1) one-stage spectral power...