Abstract Amplification of signal intensity is essential for initiating physical processes, diagnostics, sensing, communications and measurement. During traditional amplification, the amplified by multiplying carriers through an active gain process, requiring use external power source. In addition, degraded noise distortions that typically accompany processes. We show noiseless amplification repetitive optical pulse waveforms with from 2 to ~20 without using gain. The proposed method uses a...

Abstract Real-time tracking of a waveform frequency content is essential for detection and analysis fast rare events in communications, radar, radio astronomy, spectroscopy, sensing etc. This requires method that can provide real-time spectrum (RT-SA) high-speed waveforms continuous gap-free fashion. Digital signal processing inefficient to perform RT-SA over instantaneous bandwidths above the sub-GHz range and/or track spectral changes faster than few microseconds. Analog dispersion-induced...

Multitude applications of photonic devices and technologies for the generation manipulation arbitrary random microwave waveforms, at unprecedented processing speeds, have been proposed in literature over past three decades. This class engineering is known as photonics (MWP). The vast capabilities MWP allowed realization key functionalities which are either highly complex or simply not possible domain alone. Recently, this growing field has adopted integrated to develop systems with enhanced...

Mitigating the stochastic noise introduced during generation, transmission, and detection of temporal optical waveforms remains a significant challenge across many applications, including radio-frequency photonics, light-based telecommunications, spectroscopy, etc. The problem is particularly difficult for weak-intensity signals often found in practice. Active amplification worsens signal-to-noise ratio, whereas mitigation based on bandpass filtering attenuates further waveform interest....

Abstract Trains of optical pulses and optical‐frequency combs are periodic waveforms with deep implications for a wide range scientific disciplines technological applications. Recently, phase‐only signal‐processing techniques based upon the theory Talbot self‐imaging have been demonstrated as simple practical means user‐defined periodicity control pulse trains combs. The resulting schemes implement desired repetition period without introducing any noise or distortion, while ideally...

We report on the linear conversion of continuous-wave (CW) laser light to optical pulses using temporal Talbot array illuminators (TAIs) with fractional orders 1/q(q≤10), implemented by use multilevel PM and dispersive propagation in a chirped fiber Bragg grating. The generated, sub-nanosecond pulse trains have repetition rates gigahertz range show presence satellite originated finite electrical modulation bandwidth (7.5 GHz). Though this fact impacts resulting extinction ratio, an...

We develop a strikingly simple fiber-optics pulse repetition-rate multiplication approach, based on dispersion-induced temporal self-imaging (TSI) effect, in which the rate factor can be electrically programmed to any desired integer value. The multiplier setup is composed of an electrooptic phase modulator followed by dispersive medium. In contrast conventional TSI-based rate-multiplication techniques, required dispersion fixed this method and does not depend factor. Programming output...

We propose and experimentally demonstrate a reconfigurable microwave photonic filter based on temporal Talbot effects. The signal is first uniformly sampled by train of optical pulses through electro-optic intensity modulation. are then directed to Talbot-based processor, consisting an phase modulator chromatic dispersion line. (TMPF) exploits the inherent properties self-imaging effect for mitigating pulse-to-pulse fluctuations transmit some fluctuation frequencies mitigate or entirely...

The temporal Talbot effect comprises a set of self-imaging phenomena in which pulse train undergoes various coherence revivals after propagation through dispersive medium. Besides the intrinsic physical interest phenomenon itself, has found practical applications scientific areas. In optical signal processing, been used to multiply repetition-rate periodic sequences by integer factors. Because it operates coherently on frequencies that comprise train, shown mitigate noise such as reduction...

In recent years, a variety of interesting concepts have been proposed to enable the concealment objects from detection or observation, including invisibility cloaking. For an object remain truly transparent illumination wave, cloak must restore exact spatio-temporal profile both amplitude and phase variations across entire frequency spectrum, i.e., full field. However, on basis their fundamental operating principles, present solutions force different components broadband wave experience...

Electronic Boolean logic gates, the foundation of current computation and digital information processing, are reaching final limits in processing power. The primary obstacle is energy consumption which becomes impractically large, > 0.1 fJ/bit per gate, for signal speeds just over several GHz. Unfortunately, solutions offer either high-speed operation or low-energy consumption. We propose a design that can achieve both simultaneously (high speed low consumption), here demonstrated NOT XNOR...

Integer and fractional spectral self-imaging effects are induced on infinite-duration periodic frequency combs (probe signal) using cross-phase modulation (XPM) with a parabolic pulse train as pump signal. Free-spectral-range tuning (fractional effects) or wavelength-shifting (integer of the comb can be achieved by changing peak power or/and repetition rate without affecting envelope shape bandwidth original comb. For design purposes, we derive complete family different signals that allow...

Noise mitigation is critical in a myriad of scientific disciplines and applications, including spectroscopy, telecommunication, sensing. The task particularly difficult when working the Fourier (frequency) domain. This study presents methodology to redistribute energy spectrally periodic wave along its frequency spectrum, noiseless fashion, obtain new set waveforms with higher spectral peak power over input noise floor. mechanism passive amplification based on an elegant, powerful...

We report on a novel, efficient technique for all-optical clock recovery from RZ-OOK data signals based spectral phase-only (all-pass) optical filtering. This significantly enhances both the recovered quality and energy efficiency in comparison with conventional amplitude filtering approaches using Fabry-Perot filter. The proposed concept is validated through of 640 Gbit/s signal commercial linear waveshaper.

We report an experimental demonstration of spectral self-imaging on a periodic frequency comb induced by nonlinear all-optical process, i.e., parabolic cross-phase modulation in highly fiber. The free range is reconfigured simply tuning the temporal period pump pulse train. In particular, undistorted FSR divisions factors 2 and 3 are successfully performed 10 GHz comb, realizing new combs with 5 3.3 GHz, respectively. power requirement associated to SSI phenomena also shown be significantly...

We propose and experimentally demonstrate repetition-rate multiplication of picosecond optical pulse trains by a fractional factor based on temporal self-imaging, involving phase modulation first-order dispersion. Multiplication factors 1.25, 1.33, 1.5, 1.6, 1.75, 2.25, 2.33, 2.5 are achieved with high fidelity from mode-locked laser an input between 10 20 GHz.

We report the theoretical prediction and experimental observation of averaging stochastic events with an equivalent result calculating arithmetic mean (or sum) a rational number realizations process under test, not necessarily limited to integer record realizations, as discrete statistical theory dictates. This concept is enabled by passive amplification process, induced self-imaging (Talbot) effects. In specific implementation reported here, combined spectral-temporal Talbot operation shown...

Temporal self-imaging effects (TSIs) are observed when a periodic pulse train propagates through first-order dispersive medium. Under specific dispersion conditions, either an exact, rate multiplied or divided image of the input signal is reproduced at output. TSI possesses interesting self-restoration capability even acting over aperiodic pulses. In this work, we investigate and demonstrate, for first time to our knowledge, produce sub-harmonic (rate-divided) trains from sequences. We use...

We propose a novel approach for all-optical return-to-zero (RZ) to non-return-to-zero (NRZ) telecommunication data format conversion based on linear spectral phase manipulation of an RZ signal. The operation principle is numerically analyzed and experimentally validated through successful 640 Gbit/s coherent signal into the equivalent NRZ time-domain using simple filter implemented by commercial optical waveshaper.

We experimentally demonstrate intensity amplification of repetitive picosecond optical pulses with an input-to-output gain up to 5.5 dB using a passive Talbot amplifier. Through the dispersion-induced temporal effect, amplifier uses electro-optic phase modulation and low-loss dispersive medium exploit coherently redistribute energy original pulse train into fewer, replica, amplified pulses. In addition, we show how our mitigates timing-jitter pulse-to-pulse fluctuations above specific cutoff...

We present a new approach to mitigate nonlinear impairments-mainly induced by self-phase modulation (SPM)-of high-repetition-rate optical pulses propagating through fiber-optic devices (amplifiers, propagation lines, etc.). The proposed is based on pulse division before propagation, followed recombination using fractional temporal self-imaging (also known as the Talbot effect) in dispersive medium. This directly addresses practical limitations of previous mitigation methods when applied...

The performance of a directly modulated laser (DML) in direct detect system is greatly impaired by its inherent frequency chirp and chromatic dispersion the optical fiber, limiting both transmission speed reach. Chirped managed lasers (CMLs) were introduced as solution to extend reach improve receiver sensitivity tailoring spectrum DML using an filter. In this work, we present simple semi-analytical approach for deterministically designing filter CMLs. This can be applied design...

We introduce and experimentally demonstrate a new design for passive Talbot amplification of repetitive optical waveforms, in which the gain factor can be electrically reconfigurable. The amplifier setup is composed an electro-optic phase modulator followed by dispersive medium. In contrast to conventional amplification, here we achieve different factors using combinations fixed dispersion programmable temporal modulation. To validate design, show tunable, picosecond pulses with from m = 2...