Measurements are presented of the lowest timing jitter reported to date for a harmonically modelocked Er fibre laser. Phase detection noise measurements demonstrate < 10 fs over frequency range 100 Hz – 1 MHz.

Acoustic wave devices coated with a thin layer of chemoselective material provide highly sensitive chemical sensors for the detection and monitoring vapors gases. In this work, variety coating materials deposition techniques have been evaluated on surface acoustic (SAW) devices. A novel film technique, matrix assisted pulsed laser evaporation (MAPLE), is utilized to coat high quality polymer films SAW devices, conventional used deposit passivation diamond-like-carbon device prevent water...

The characteristics and properties of proton exchange annealed waveguides in lithium tantalate are investigated. Planar first studied using secondary-ion mass spectrometry (SIMS) to obtain the hydrogen- lithium-ion concentration profiles. From this data, accurate anneal diffusion coefficients calculated. Optical propagation constants also measured used conjunction with SIMS results calculate change extraordinary refractive index at λ=0.6328 0.829 μm. Infrared-absorption measurements taken...

We report the development and demonstration of first true time-delay (TTD) fiber-optic beamformer for ultrawideband antenna receive operation. The is based on a dispersive-fiber prism configuration that properly time delays signals originating at each receiving element coherent combining in microwave domain. time-steered consists eight spiral elements arranged into one-dimensional (l-D) sparsely populated array. array shows an instantaneous bandwidth 6-18 GHz, limited by available matched...

A wide-band fiber-optic true-time-delay array receiver capable of receiving multiple independent beams simultaneously is demonstrated for the first time.The based on a dispersive prism technique and exhibits squint-free 660 azimuthal steering two simultaneous with no observable beam squint over microwave component-limited bandwidth 6-18 GHz.

ABSTRACT Electrophysiological studies suggest that motoneurone B19 in the buccal ganglia of Helisoma makes monosynaptic, cholinergic connections with supralateral radular tensor (SLT) muscle mass. Serotonin (5-HT) and small cardioactive peptide B (SCPB) were found to have peripheral modulatory effects on this motor pathway are consistent their previously described central facilita tory effects. Both neurotransmitters, when applied exogenously (10−6moll−1) isolated ganglion-buccal...

The authors have developed a novel, simple chirped-grating based beamformer for time-steered array antennas. is on commercially available chirped fibre gratings and optical circulators has measured bandwidth of over 18 GHz. first-ever demonstration achieves quasi-continuous 1D steering 45°.

We report a first demonstration of fiber-optic beamformer for independent two-dimensional (2-D) true time-delay steering transmitter array. The is based on simple dispersive prism optical delay approach, with separate azimuth and elevation control stages. stage includes an amount dispersion in each link proportional to the corresponding column position microwave signals, properly time-delayed steering, are amplified serve as inputs identical prisms feeding elements column. stages include row...

The impetus for future array antenna systems has revolved around the demands increased capabilities in antennas including larger arrays higher power and better angular resolution, wide bandwidths, reconfigurability operating frequencies. In order to move microwave photonics technology beyond proof-of-concept phase compete with alternate approaches, community must be quicker grasp issues involved. This paper surveys some of techniques optical control antennas, addresses system-level insertion...

A photonic analog-to-digital (A/D) link with third-order distortion suppression is proposed and demonstrated. Experimental results single-and two-tone analog input signals a one giga-sample per second (GSPS) A/D system 500-MHz instantaneous bandwidth are presented. The application of simple time-domain linearization scheme in approaching 30 dB allows optical modulation depths over 80%.

The stability of annealed proton exchange waveguides and devices in LiTaO3 is examined by monitoring the output power ratio passive directional couplers. This shown to be an extremely sensitive technique for measuring waveguide stability. Mode propagation constants planar near-field mode sizes losses channel are also measured as a function time. Data from these measurements indicate that refractive index profile unstable continuously evolves even relatively long anneal times. instabilities...

The major reason for prenatal diagnosis lies in the detection of trisomies, particularly trisomy 21 (Down's syndrome). Current techniques require lengthy laboratory procedures and high costs. Furthermore, is often not possible if sample small size or contaminated. An alternative method, quantitative fluorescent polymerase chain reaction (PCR) short tandem repeats (STRs), can also be used to diagnose trisomies it has advantage that a result obtained within five eight hours. However, this...

A photonic analog-to-digital converter with a binary optical output was constructed. The architecture scheme is pipeline converter, employing phase modulators and polarization-based optics. result analog signal processor that maps an input waveform into output. operational speed of the conversion primarily limited by maximum slew rate modulators.

Due to their unique capabilities, fiber-optics and photonics are key enabling technologies for many military sensors systems. The influence of on current future trends in will be presented.

An ultrawide-band fiber-optic true time-delay millimeter-wave array transmitter is fully characterized and demonstrated in this paper.The beamformer based on dispersive-prism optical-delay lines exhibits squint-free 60 steering azimuth across the entire -band (26.5-40GHz).This believed to be first functioning demonstration of a photonically controlled wide-band system.

We present the lowest measurements of timing jitter, to our knowledge, a harmonically mode-locked fiber laser. Phase detection noise demonstrate jitter less than 10 fs from 100 Hz 1 MHz.

Technically, most people agree that conserving soil organic matter and completing nutrient cycles by applying animal manures, treated wastes biosolids to land is the sustainable option in majority of situations. It also generally least expensive. There has been a huge amount research into hazards, this concluded risks can be managed acceptable levels. But there insufficient attention communicating knowledge, as so often scientific technological arena. Perception reality. Nowadays compliance...

A novel technique for forming and steering squint-free wide-band nulls in the far-field pattern of an ultrawide-band array antenna is presented. The nulling system relies upon a fiber-optic dispersive prism tapped delay-line microwave filter to generate appropriate waveform. null-forming architecture was integrated with true-time-delay transmit beamformer demonstration anechoic chamber. Measurements show null depths order 15 dB over 4-18-GHz bandwidth various angles. demonstrated may be used...

A mixed digital-to-analog (D/A) high speed circuit board capable of driving a tunable super structure grating distributed Bragg reflector (DBR) laser is developed. The used to control the over 20-nm tuning wavelength range with 0.1 nm resolution. Three currents are preprogrammed into an electrically erasable/programmable read-only memory (EEPROM) look-up table for each wavelength. Upon receiving differential logic signal, tunes specified output within 500 ns. long-term repeatability tuned...

Butler matrices, consisting of 3 dB directional couplers and phase shifters, can be used to obtain specific relationships between the signals on feedlines various antenna elements in a phased array system. Microwave matrices microwave shifters are difficult fabricate because crosstalk EMI. Integrated optical addition being immune EMI having negligible cross talk, small size, lightweight fabricated single substrate. Some advantages using an integrated matrix for beam steering detection system...

A real-time two-channel photonic analog-digital converter operating at >2 GSPS has been constructed and demonstrated for the first time, to our knowledge. The architecture is based on time-interleaving of discrete, spectrally-distinct optical pulses.

A rapid evolution in military sensor and system design is currently underway. Photonics techniques have the potential to play a critical role these future systems due their unique capabilities. These emerging trends for photonics support them will be discussed.