Showing papers in "Optics Communications in 2012"

TL;DR: A novel image encryption scheme based on the improved hyperchaotic sequences that can achieve high key sensitivity and high plaintext sensitivity through only two rounds diffusion operation is proposed.

TL;DR: Analyzing the security of a recently proposed asymmetric cryptosystem that based on the phase-truncated Fourier transforms (PTFTs) implies that some appropriate measurements should be made to enhance the resistance of the PTFT-based cryptos system against the specific attack when it is used as a public-key cryptosSystem.

TL;DR: A tutorial introduction to optical microfibers and nanofibers regarding their optical properties, fabrication and applications, with a brief outlook into future trends in this area is given in this article.

TL;DR: In this paper, a new optical channel drop filters (CDFs) configuration based on photonic crystals ring resonators (PCRRs) is provided, and the transmission characteristics for single-ring and multiple-ring configurations have been investigated by using the 2D finite-difference time-domain (FDTD) technique in triangular lattice photonic crystal (PC) silicon rods.

TL;DR: An adaptive method to increase the number of embeddable spaces by referencing a dual binary tree is proposed and significantly improves the image quality and payload of Tai et al.'s works, especially at low embedding level.

TL;DR: In this article, an analysis of the intense blue upconversion emission at 476 and 488 nm in Tm 3+ /Yb 3+ codoped Y 2 O 3 under excitation power density of 86.7 W/cm 2 available from a diode laser emitting at 976-nm, has been undertaken.

TL;DR: In this article, a new amplification method, weaving the three basic compression techniques, Chirped Pulse Amplification (CPA), Optical Parametric (OPCPA) and Plasma Compression by Backward Raman Amplification(BRA) in plasma, is proposed.

TL;DR: A new image encryption algorithm is introduced by using a combination of parametric bit-planes decomposition along with bit-plane shuffling and resizing, pixel scrambling and data mapping, which can be used to encrypt images, biometrics and videos.

TL;DR: In this paper, a wideband homodyne detector for time-domain quantum measurements was proposed and characterized using inexpensive, commercially available components such as low-noise high-speed operational amplifiers and high-bandwidth photodiodes.

TL;DR: In this article, an all-solid photonic fiber with D-shaped structure based surface plasmonic resonance sensor using a FEM (Finite element method) with PMLs boundary conditions was investigated.

TL;DR: Simulation results show that the performance and security of the proposed encryption algorithm can encrypt plaintext effectively and resist various typical attacks.

TL;DR: In this article, the performance of a single wavelength 2-bit all-optical analog-to-digital converter (ADC) was demonstrated with two high efficient channel drop filters with a coupled cavity-based wavelength selective reflector.

TL;DR: In this article, the intensity and coherence properties of a Gaussian beam propagating through the clear-water turbulent ocean are explored using the Rytov method and Belen'kii and Mironov's method of effective beam parameters.

TL;DR: In this paper, the temperature dependence of the defect mode in a one-dimensional defective photonic crystal is studied by simultaneously considering thermal expansion effect and thermal-optical effect, and a tunable transmission filter working in the visible region is proposed.

TL;DR: Using the pseudorandom sequence generated by a group of one dimensional chaotic maps, the proposed algorithm realizes fast encryption and decryption of both gray-scale image and true color image.

TL;DR: In this article, a dipole soliton solution for the higher order nonlinear Schrodinger (HNLS) equation with non-Kerr nonlinearity under some parametric conditions and subject to constraint relation among the parameters in optical context is presented.

TL;DR: In this paper, the authors report on the ultrafast optical limiting in the IR regime of pulse laser deposited VO 2 nanostructures, which is characterized by a significant and reversible variation of the refractive index under either thermal stimuli or by photo-induction.

TL;DR: In this article, the effect of varying the cladding-core radius ratio on the LP 11 adiabatic criterion is modeled, and a Laguerre-Gaussian beam is created in free space using a spatial light modulator (SLM) and coupled to a few-mode fiber.

TL;DR: In this article, undoped and Erbium (Er) doped zinc oxide (EZO) thin films were deposited on glass substrate by sol-gel method using spin coating technique with different doping concentration.

TL;DR: A novel approach without needing parity bits to share a secret image into n stego-images is presented, which provides better visual quality and has higher detection ratio with respect to all previous SAIS schemes.

TL;DR: In this article, stable pulses were generated at 2μm in a passively Q-switched thulium-doped fiber laser using a few layer graphene thin film, and the maximum output power was 4.5mW and the single pulse energy was 85 nJ at 53 kHz repetition rate, the pulse width was about 1.4μs.

TL;DR: In this paper, a quasi-distributed optical fiber sensing network with large multiplexing capacity, which is based on identical weak fiber Bragg gratings, is proposed, theoretically analyzed and experimentally studied.

TL;DR: In this paper, the authors demonstrate a new optical bistability devise by using two Fiber Bragg Gratings (FBG), in which an erbium-doped fiber is inserted to form a nonlinear Fabry-Perot cavity (EDF FBG/F-P).

TL;DR: This study analyzes the security weaknesses of the “C.

TL;DR: In this article, an electronically controlled polymer optical fiber cleaver was fabricated, which uses a razor-blade guillotine and provides independent control of fiber temperature, blade temperature, and cleaving speed.

TL;DR: Experimental results and security analysis not only show that the scheme can achieve good encryption result, but also that the key space is large enough to resist against common attack.

TL;DR: Experimental results show that the proposed scheme is robust against most common attacks including JPEG lossy compression, JPEG 2000 compression, low-pass filtering, cropping, noise addition, blurring, rotation, scaling and sharpening et al.

TL;DR: In this paper, a temperature-independent highly-sensitive curvature sensor by using a tapered-photonic crystal fiber (PCF)-based Mach-Zehnder interferometer (MZI) is proposed and experimentally demonstrated.

TL;DR: In this article, the electronic structure and optical properties of (N, Ga) codoped ZnO were analyzed by using first-principle method based on DFT (Density Functional Theory).

TL;DR: In this paper, a fast and accurate gamma correction technique based on a Fourier spectrum analysis is proposed, where only two spatial-carrier fringe patterns with different pre-encoded gamma values are needed and the number of fringe patterns required for gamma pre-calibration is significantly reduced without loss of accuracy.