The propagation characteristics of lightwave in spatial and temporal domains are reviewed, and a general analogy of spatial diffraction and temporal dispersion is presented in details. By using the transformation pairs of spatial

We propose a compact hydrogen sensor, based on Fabry-Perot interferometer with Pd/Ag composite film, fabricated by femtosecond laser micromachining and thin-film coating technique. The sensing characteristic of sensor with 150-nm

We propose a simple and low-cost Fabry-Perot (F-P) fiber sensor based on an inner air cavity. The air cavity is fabricated at the fiber-tip by splicing a single-mode fiber and a hollow-core photonic crystal fiber (HC-PCF), with un

We develop the kinematic model of portable coordinate measuring arm (PCMA) based on the research on its mechanical characteristics and working principle, and present a comprehensive thermally-induced error correction model for PCM

We propose a novel and compact broadband 1×3 beam splitter (BS), which is based on optical tunneling between neighbor and parallel waveguides; thus, it is used to couple energy from one waveguide to another. This device consists o

A graded metallic grating structure acts as a wave trapping system. Different frequencies of THz waves are trapped at different positions along this structured metal surface grating. The real wave propagation speed of such a syste

In order to meet the requirements of vibration monitoring of large mechanical equipment, the authors design a novel three-dimensional (3D) high-frequency fiber Bragg grating (FBG) accelerometer. First, the operation principle of t

Fiber Bending causes the bending loss, which mainly reduces the optical signal noise ratio (OSNR) of the optical transmission signal. When the fiber is bent to a certain degree, it will cause an interrupt signal. In this paper, we

Based on Software defined network (SDN), we brought up the NetWork Test Tools for communication networks. It is an innovative application of SDN, which can support the application traffic...

We propose and experimentally demonstrate a novel approach to measure the Er3+ concentration in Er3+-doped silica fiber by fiber Bragg grating Fabry-Perot (FBG-FP) cavity ring-down spectrum. The relationship between the cavity rin

In order to increase the anti-counterfeiting performance of optically variable devices, the innovative interference security image structures based on metamerism have been developed. In this letter, we show a pair of all-dielectri

We propose a reconfigurable 8PSK/8QAM modulator implementation by employing two cascaded QPSK modulators with an interferometer in between. With simple control of bias voltage of the interferometer, a flexible switching between 8P

We propose a dither-free 8-phase-shift-keying (8PSK) generator control scheme for adjusting the bias voltage of Mach–Zehnder modulator (MZM) and the electrical driver signals of two cascaded phase modulators (PMs). The control mod

In this study, we propose that by diminishing only the pitch of the innermost air-holes-ring of a HF1 photonic crystal fiber, both an effective mode area up to 100 μm2 at 1.55 μm wavelength and nearly zero dispersion of 0.2 ± 1 ps

A high-performance compact vibration sensor based on fiber Bragg grating (FBG) is designed. The acceleration sensitivity of the FBG vibration sensor is measured to be larger than 30 pm/g. From 10 Hz to 250 Hz, a quite flat frequen

We propose, fabricate, and demonstrate a compact fiber-tip Fabry-Perot interferometer of microcavity for high-temperature sensing. The microcavity which can be used for temperature or pressure sensing is fabricated by using arc di

A broadband- and photonic-integrated convenient chaotic-light transmitter with both optical feedback and mutual optical-coupling techniques are proposed. Both numerical simulation and experimental results show that the bandwidth o

There is a need to develop a non-destructive and fast detection method for bruising of fruits because the injuries lower quality of fruits, which lead to economic loss. In this paper, we propose a method to detect the bruise on ap

Laser generation and electromagnetic acoustic transducer (EMAT) detection techniques are combined as a hybrid ultrasonic technique for the inspection of the defects in the steel. Laser transmits through the optical fiber and irrad

Adaptive optics is implemented in a confocal scanning fluorescence microscopy using a wavefront sensorless correction scheme. Using the image sharpness as the optimization metric, aberration correction is performed to compensate b

It is found that application of Retinex color constancy algorithm in machine vision can weaken light interference on printing chromatic aberration. We propose a new method of fusion of Weighted Least Squares and Multi-Scale Retine

A planar-hyperlens-based imaging device is presented in this paper. Based on the structure of hyperbolic dispersion metamaterial and with the ability of collecting the evanescent waves from the object, the planar hyperlens can del

In this study, based on magnetic tunable characteristics of nanoparticle magnetic fluid, we design the photonic crystals' defect-localized modes with a defect layer of nanoparticle magnetic fluids. The transmission spectrum of one

Re3+, Yb3+ co-doped (Re0.005YbxY(0.995-x))3Al5O12 [Re = Ce, Er, x = 0, 0.02, 0.05, 0.1, and 0.2] transparent ceramics are synthesized by the solid state reaction and vacuum sintering as the down-conversion (DC) materials. The phot

For linear electrooptic (EO) effect of femtosecond laser pulses that propagates along the direction of non-optical axis in linear-chirped and periodically poled MgO:LiNbO3 (LCPPLMN), we explore the compensation scheme for the phas

We report on the existence and stability of defect solitons in two-dimensional optical Bessel potentials. It is found that for zero defect, defect solitons are stable in the entire existence domain. For negative defects, defect so

We generate a flat temporal-phase distribution optical pulse by 1.3-mm-long photonic crystal waveguide. The effect of coupled pulse energy on the temporal-phase distribution of the output pulse is analyzed by numeral simulating. S

Nonlocality control is investigated in nonlinear media using material combination with self-focusing and self-defocusing media, and the controlling effects on the propagation and interaction of the spatial solitons are analyzed by

We investigate the ultrafast nonlinear phenomena of picosecond chirped non-ideal hyperbolic secant pulse evolution in silicon photonic nanowire waveguides with sum frequency generation cross-correlation frequency-resolved optical

Wavefront coding (WFC) is kind of computational imaging technique that controls misfocus and misfocus-related aberrations of optical systems by appending a specially designed phase distribution to the pupil function. This technolo

Demand for large-scale off-axis aspherical mirrors is increasing in next-generation space-borne optical imaging systems. In this paper, a variable-axis single-point grinding strategy is developed for precisely, cost-effectively fi

The removal function test is carried out on the earlier round-pellet polishing pad. The concept of filling factor is introduced to evaluate the removal function obtained from the experiments mentioned in the paper. To improve the

Quantitative phase imaging (QPI) of biological cells is an important developing technique. In this paper, a derivative method of phase extraction is put out under several typical blood cells' models, which is completed by numerica

The application of dark-field (DF) technique with adaptive optics for retinal imaging in vivo is presented to improve retinal imaging contrast. The influence on the imaging contrast introduced by dynamic ocular aberrations should

We propose modified local mean decomposition to analyze signals of fringe pattern adaptively. It decomposes the signals into a set of functions, each of which is the product of amplitude signal and frequency signal. Then, the phys

In present work, we demonstrate that when a transverse magnetic (TM) Gaussian beam is incident to a magnetic metamaterial (MM) slab, it can be completely absorbed at a particular direction, resulting in a unidirectional perfect ab

Combination of full-vector finite element method with anisotropic perfectly matched layers results in a novel structure of low-dispersion photonic crystal fiber with high birefringence. The negative dispersion can be obtained at a

A simple, low-cost, and high-efficient method is used for the fabrication of surface-enhanced Raman scattering (SERS) substrates. Silver particles deposited on porous silicon are prepared as a highly efficient SERS substrate by di

A porous silicon microcavity (PSM) is highly sensitive for sensing applications due to its high surface area and a narrow resonance peak. In this letter, we fabricated the PSM by alternate current density from a low value to a hig

We study all-optical sensing characteristics based on long-range surface plasmon resonance in a four-layered metal-dielectric structure immersed in the liquid to be measured. The resonance peaks in the reflection angle spectra dep

This paper proposes a novel method of multibeam laser heterodyne measurement for an electrostriction coefficient. Based on the Doppler effect and heterodyne technology, loaded with the information of length variation to the freque

Photoresponse of large-area multi-walled carbon nanotube (MWCNT) films is explored under laser illumination. The experiment shows that the photo-induced current shows nearly linear response to the bias voltage. The photocurrent de

Doppler spectrum width, which relates to wind turbulence, is one of the essential parameters of coherent LIDAR. Using the Fourier transform theorem and the definition of correlation function, the power spectrum function in the sta

We develop optical fiber nanoprobe by spark fused taper and acid corrosion methods. By coupling with 3-aminopropyltrimethoxysilane, gold nanoparticles are solidified onto the surface of fiber optic and then the optical fiber senso

In this letter, we introduce the project of multilayer dielectric film based on conventional optics to design laser-protective coating. A desired material with an ideal refractive index is used to optimize the design results. Two

In this Letter, we investigate the packet error rate (PER) performance of digital pulse interval modulation (DPIM) for free-space optical (FSO) links under the combined effect of turbulence and pointing errors. The theoretical mod

Partially coherent vortex beams are generated by the illumination of high-power red-color light-emitting diodes. We investigate the influence of correlation property of partially coherent vortex beams on intensity distribution. Th