We monitor the induced phase change produced by a cascaded χ(2):χ(2) process in KTP near phase-matching angle on picosecond 1.06-μm-wavelength beam using Z-scan technique. This nonlinear refraction is observed to sign as crystal rotated through phase-match accordance with theory. theory predicts maximum small-signal effective refractive index of n2eff≅±2×10−14 cm2/W (±1 × 10−11 esu) for an detuning ±5° from match this 1-mm-thick measured deff 3.1 pm/V For fixed mismatch, n2eff scales...

The bound electronic nonlinear refractive index, n/sub 2/, and two-photon absorption (2PA) coefficient, /spl beta/, are measured in a variety of inorganic dielectric solids at the four harmonics Nd:YAG laser using Z scan. specific materials studied are: barium fluoride (BaF/sub 2/), calcite (CaCO/sub 3/), potassium bromide (KBr), lithium (LiF), magnesium (MgF/sub sapphire (Al/sub 2/O/sub tellurite glass (75%TeO/sub 2/+20%ZnO+5%Na/sub 2/O) fused silica (SiO/sub 2/). We also report 2/ beta/...

Compact electro-optical modulators are demonstrated on thin films of lithium niobate silicon operating up to 50 GHz. The half-wave voltage length product the high-performance devices is 3.1 V.cm at DC and less than 6.5 3 dB electrical bandwidth 33 GHz, with an 18 extinction ratio. third-order intermodulation distortion spurious free dynamic range 97.3 dBHz2/3 1 GHz 92.6 10 performance by thin-film par conventional but lower drive voltages, smaller device footprints, potential compatibility...

A simple dual-wavelength (two-color) Z-scan geometry is demonstrated for measuring nonlinearities at frequency omega(p) owing to the presence of light omega(e). This technique gives nondegenerate two-photon absorption (2PA) coefficient beta(omega(p); omega(e)) and nonlinear refractive index n(2)(omega(p); omega(e)), i.e., cross-phase modulation. We demonstrate this on CS(2) n(2) ZnSe where 2PA are present simultaneously.

We introduce a method for measuring the anisotropy of nonlinear absorption and refraction in crystals by incorporating wave plate into Z-scan apparatus. demonstrate this polarization dependence refractive index or two-photon coefficient BaF2, KTP, GaAs at wavelengths 532 1064 nm.

We present a simple and efficient technique to produce double sideband suppressed carrier (DSBSC) modulation for coherent analog optical communications. When operating Mach-Zehnder electro-optic modulator at the appropriate bias point exits one of output ports while information carrying sidebands exit other port. The absence strong component in DSBSC allows use an amplifier immediately following where light signals are still relatively hence preserving high S/N. In our experiments using...

Integrated silicon microwave photonics offers great potential in phase shifter elements, and promises compact scalable multi-element chips that are free from electromagnetic interference. Stimulated Brillouin scattering, which was recently demonstrated silicon, is a particularly powerful approach to induce shift due its inherent flexibility, offering an optically controllable selective shift. However, date, only moderate amounts of gain has been achieved theoretically this would restrict the...

We propose a new modulation format recognition method for optical links employing OOK, M-PSK, M-PAM, and M-QAM formats. The combines the Stokes space analysis higher order statistics as part of universal digital coherent receiver. Experimental investigation demonstrates successful single-carrier signals modulated at 31.5 GBd with BPSK, QPSK, or 16QAM, transported through 810 km large area fiber. These results enable development autonomous receivers capable identifying demodulating unknown...

We experimentally demonstrate accurate modulation format identification, optical signal to noise ratio (OSNR) estimation, and bit error (BER) estimation of signals for wavelength division multiplexed communication systems using convolutional neural networks (CNN). assess the benefits challenges extracting information at two distinct points within demodulation process: immediately after timing recovery prior symbol unmapping. For former, we use 3D Stokes-space based representations. latter,...

We report our experimental results for linear analog optical links that use phase or frequency modulation and discrimination. The discriminators are based on two architectures: a cascaded MZI FIR lattice filter ring assisted (RAMZI) IIR filter. For both types of discriminators, we demonstrate > 6 dB improvement in the link's third-order output intercept point (OIP3) over MZM link. show have low second-order distortion when using balanced detection. Using high power, an OIP3 39.2 dBm. also...

We present a reconfigurable optical discriminator filter for frequency modulated microwave-photonics link applications. The is based on simplified ring-assisted Mach-Zehnder interferometer configuration. It enables conversion of highly linear to amplitude modulation. Operations in fixed bandwidth (BW) 30 GHz and tunable from 10 are achieved using third- fifth-order filters. A balanced discrimination architecture with electronically transfer characteristics demonstrated. measured output-third...

Microwave photonic phase shifters based on stimulated Brillouin scattering (SBS) offer tunable and broadband, optically controllable shifts. However, achieving a 360° shift requires large amount of SBS gain which often exceeds the available power handling capability an integrated waveguide. A Radio Frequency (RF) interference technique has recently been utilized in silicon platform, uses forward suspended waveguide to compensate for lack standard insulator platforms. This scheme amplifies at...

True-time delays are important building blocks in modern radio frequency systems that can be implemented using integrated microwave photonics, enabling higher carrier frequencies, improved bandwidths, and a reduction size, weight, power. Stimulated Brillouin scattering (SBS) offers optically-induced continuously tunable is thus ideal for applications require programmable reconfiguration but previous approaches have been limited by large SBS gain requirements. Here, we overcome this...

We present a microwave photonic link architecture that enables high gain and dynamic range, low noise figure, multi-octave bandwidth operation. Our method uses double sideband suppressed carrier modulation together with balanced coherent heterodyne detection scheme. The increases linearity by producing carriersuppressed amplitude based on the optical field rather than intensity. combination of suppression, amplification, phase-locked local oscillator insertion, provide signal-efficient gain,...

RF photonic techniques can be used to extend operating frequencies and bandwidth of mission communications sensing systems. Photonic links inherently cover wide frequency bandwidths optical modulators detectors have been demonstrated that operate up 100 GHz. This paper presents a method for tunable high carrier generation wideband conversion. down-conversion measurements are presented with +24 dBm OIP3 positive gain across input signals from 5 20 Additionally, undesired higher order mixing...

A photonic frequency converter based on optical sideband filtering can be used to produce upand down converted signals over a wide range of RF frequencies. The reduction mixing spurs provides an important advantage conventional mixers for wide-band operation. We demonstrate down-conversion from 5 20 GHz 100 MHz IF with positive gain and high linearity, direct digitization down-converted at 10 low degradation ADC performance.

With the commissioning of latest 10-Gb/s systems, vendors are now in process developing architectures for their next-generation products. 40-Gb/s components and subsystems currently development to address necessities these systems. The top three challenges associated with transmission optical signal-to-noise ratio, dispersion, high-speed components. In order realize transmission, new component subsystem developments crucial. This paper reviews technologies dispersion compensation techniques...

Optical transmission of microwave signals offers many advantages such as increased bandwidth; immunity to electromagnetic interference; reduction size, weight and power consumption; low, frequency-independent loss over long distances. But photonic links often lack the performance required replace traditional links. We present a link architecture that enables high gain dynamic range, low noise figure, multi-octave bandwidth operation. Our method uses double sideband suppressed carrier...

We report on picosecond laser-induced damage experiments that were carried out a natural type-IIa diamond and thick specimen of high-quality chemically vapor-deposited (CVD) diamond. In conjunction with earlier measurements performed elsewhere an ‘‘optically thick’’ single crystal, it is shown for spot sizes (2ω) ranging from 3 to 60 μm, the breakdown field strength (EBD) at threshold obeys pattern best described as follows: EBD≂A/√2ω, where A=30.7 38.7 MVμ1/2/cm 532 1064 nm, respectively....

We present a photonic-assisted wideband tunable RF frequency converter with low phase noise to provide IF translation, and demonstrate 121 dB*Hz2/3 spur-free dynamic range at 20 GHz 2 IF.

We present a photonic method for tunable high frequency carrier generation and wideband RF down-conversion with low phase noise. The noise of the generated RF/IF signal is limited by generator used to synthesize optical local oscillators. show measurements synthesized carriers at 24 GHz +24 dBm OIP3 positive gain from 5 - 20 100 MHz IF, ADC-limited digitization.

Radio-frequency (RF) photonics is demonstrating superior performance in communication systems using discrete components. As establish an upgrade path balancing challenging bandwidth requirements with size, weight, and power constraints, the time ripe for transition to a more efficient cost-effective hybrid manufacturing technology. This technology has been applied construction of optical coherent receiver down conversion RF signals from 10-18 2 GHz. Light distributed feedback semiconductor...

Broadband wireless transmission with tunable 5-40GHz carrier is demonstrated using photonic frequency conversion. The agile tuner allows ~4 GHz of instantaneous bandwidth for both up- and down-conversion paths, without banding or channelization.

We demonstrate a wide-band microwave photonic link with high gain and dynamic range, low noise figure, dispersion-free propagation using double sideband suppressed carrier modulation, optical amplification balanced coherent heterodyne detection.