Importantly, factoring in the noise sources within our system enables the development of advanced noise suppression strategies without causing any degradation to the input signal, leading to a considerable improvement in the signal-to-noise ratio.

The 2022 Optica conference on 3D Image Acquisition and Display Technology, Perception, and Applications, which took place in Vancouver, Canada from July 11th to 15th, 2022, in a hybrid format as part of the Imaging and Applied Optics Congress and Optical Sensors and Sensing Congress 2022, is closely linked to this Optics Express Feature Issue. The 2022 3D Image Acquisition and Display conference is detailed in this collection of 31 articles, spanning the various subjects and ranges of discussions. This introductory material provides an overview encompassing all articles appearing in this special feature issue.

A simple and effective strategy for achieving high-performance terahertz absorption involves a sandwich structure built upon the Salisbury screen effect. Variations in the sandwich layer quantity are a significant contributing factor to the absorption bandwidth and intensity of THz waves. The construction of multilayer structures in traditional metal/insulator/metal (MIM) absorbers is challenging due to the low light transmission characteristics of the surface metal film. Graphene's utility in high-quality THz absorbers stems from its impressive characteristics: broadband light absorption, low sheet resistance, and high optical transparency. This work introduces a series of multilayer M/PI/G absorbers, employing graphene Salisbury shielding as the foundation. To elucidate graphene's role as a resistive film in high-intensity electric fields, numerical simulations and experimental validations were conducted. Improving the overall performance of the absorber in terms of absorption is vital. Low contrast medium This experiment demonstrates a positive relationship between the dielectric layer's thickness and the augmented number of resonance peaks. More than 160% absorption broadband is displayed by our device, exceeding the performance of previously reported THz absorbers. The absorber was successfully produced on a polyethylene terephthalate (PET) substrate, marking the successful conclusion of the experiment. The absorber's high practical feasibility makes it easily integrable with semiconductor technology, thus generating high-efficiency THz-oriented devices.

Employing a Fourier-transform method, we investigate the magnitude and robustness of mode selectivity in discrete-mode semiconductor lasers created by cleaving. A restricted number of refractive index disruptions are intentionally inserted into the Fabry-Perot cavity. Anaerobic biodegradation Three typical index perturbation patterns are under consideration. Our experimental results exhibit the power to substantially augment modal selectivity by utilizing a perturbation distribution function that avoids positioning perturbations close to the central region of the cavity. Our review also underlines the capacity to opt for functions that can elevate output despite facet-phase problems introduced during the creation of the device.

Grating-assisted contra-directional couplers (CDCs) were designed and experimentally shown to be effective wavelength selective filters in wavelength division multiplexing (WDM) systems. Two configuration setups were developed; a straight-distributed Bragg reflector (SDBR) and a curved distributed Bragg reflector (CDBR). Employing a GlobalFoundries CMOS foundry, the devices are built upon a monolithic silicon photonics platform. Energy exchange modulation within the CDC's asymmetric waveguides, achieved through grating and spacing apodization, suppresses the transmission spectrum's sidelobe strength. Spectral stability, characterized by a flat-top profile and minimal insertion loss (0.43 dB) of less than 0.7 nm, was exhibited by the experimental characterization across various wafers. A compact footprint of just 130m2/Ch (SDBR) and 3700m2/Ch (CDBR) defines the characteristics of the devices.

This study reports the successful demonstration of a random distributed feedback Raman fiber laser (RRFL), using all-fiber components and mode modulation to generate two wavelengths. An electrically controlled intra-cavity acoustically-induced fiber grating (AIFG) adjusts the input modal structure at the desired signal wavelength. RRFL's broadband laser output is a consequence of the wavelength agility both Raman and Rayleigh backscattering effects display when experiencing broadband pumping. The output's spectral manipulation, ultimately arising from mode competition within RRFL, is facilitated by AIFG adjusting the feedback modal content at different wavelengths. Employing efficient mode modulation, the output spectrum can be smoothly adjusted from 11243 nanometers to 11338 nanometers using a single wavelength; subsequently, a dual-wavelength spectrum can be generated at 11241 nanometers and 11347 nanometers, achieving a 45dB signal-to-noise ratio. Stability and repeatability were excellent, with the power output consistently surpassing 47 watts. We believe this mode-modulation-enabled dual-wavelength fiber laser is the very first of its kind and is currently the model with the highest reported output power for a continuous wave, all-fiber dual-wavelength laser.

Due to their multiplicity of optical vortices and higher dimensionality, optical vortex arrays (OVAs) have received significant attention. Despite the availability of existing OVAs, these have not yet been applied to harness the synergy effect as an integrated system, notably in relation to manipulating multiple particles. Ultimately, examining the practical application of OVA is crucial for fulfilling the needs of the application. Accordingly, this research introduces a functional OVA, labeled as cycloid OVA (COVA), arising from a combination of cycloidal and phase-shift techniques. The cycloid equation serves as a template, and its modification allows for the development of diverse structural parameters that shape the COVAs' form. Subsequently, COVAs that are both versatile and practical are developed and refined by experimental means. COVA uniquely employs local dynamic modulation, maintaining the integrity of the entire structure. Beyond this, the optical gears are initially designed employing two COVAs, which promise the capability for transferring several particles. OVA, by virtue of its interaction with the cycloid, acquires the characteristics and capabilities of the cycloid. To generate OVAs, this work introduces a new approach, providing advanced methods for complex manipulation, arrangement, and transport of particles.

Within this paper, we establish an analogy between the interior Schwarzschild metric and transformation optics, which we name transformation cosmology. The metric's effect on light bending is successfully represented by a straightforward refractive index profile. A critical ratio exists between a massive star's radius and its Schwarzschild radius, precisely defining the threshold for black hole collapse. We computationally illustrate the bending of light in three situations using numerical simulations. Importantly, a point source positioned at the photon sphere generates an image roughly within the star, exhibiting a similar behavior to Maxwell's fish-eye lens. This work will provide us with the means to explore the phenomena of massive stars using laboratory optical tools.

Large space structures' functional performance evaluation can be accurately assessed using photogrammetry (PG) data. The On-orbit Multi-view Dynamic Photogrammetry System (OMDPS) lacks essential spatial reference data, obstructing the necessary camera calibration and orientation processes. For this system type, a multi-data fusion calibration approach for all parameters is proposed in this paper as a solution to the existing problem. To address the unconstrained reference camera position within the full-parameter calibration model of OMDPS, a multi-camera relative position model is developed, leveraging the imaging characteristics of star and scale bar targets. The multi-data fusion bundle adjustment's deficiency in accurately adjusting parameters is addressed by a two-norm matrix and a weighted matrix, used to modify the Jacobian matrix's relationship to all system parameters, including camera interior parameters (CIP), camera exterior parameters (CEP), and lens distortion parameters (LDP). In conclusion, this algorithm facilitates the simultaneous optimization of all system parameters. In the actual data collection undertaken on the ground, 333 spatial targets were determined using the V-star System (VS) and OMDPS. Considering VS measurements as the standard, OMDPS results show an in-plane Z-direction target coordinate root-mean-square error (RMSE) below 0.0538 mm and a Z-direction RMSE below 0.0428 mm. click here The out-of-plane Y-component's root-mean-square error is below 0.1514 millimeters. Empirical data from a ground-based experiment confirms the application potential of the PG system for on-orbit measurement tasks.

Our numerical and experimental examination of probe pulse deformation within a forward-pumped distributed Raman amplifier, situated on a 40 km standard single-mode fiber, is reported. Although distributed Raman amplification can extend the range of OTDR-based sensing, it may also lead to a deformation of the pulses. A strategy for reducing pulse deformation involves using a Raman gain coefficient of a smaller magnitude. The decrease in the Raman gain coefficient can be compensated for, thereby preserving sensing performance, by a corresponding increase in pump power. Predictions indicate the tunable range of the Raman gain coefficient and pump power, provided probe power remains below the modulation instability limit.

A field-programmable gate array (FPGA) was used to implement a low-complexity probabilistic shaping (PS) 16-ary quadrature amplitude modulation (16QAM) scheme within an intensity modulation and direct detection (IM-DD) system. This scheme utilizes intra-symbol bit-weighted distribution matching (Intra-SBWDM) for discrete multi-tone (DMT) symbols.