Showing papers in "Optics Communications in 2011"

TL;DR: In this paper, a tutorial on the field of femtosecond pulse shaping, a technology that enables generation of nearly arbitrary, user defined, ultrafast optical waveforms, with control of phase, amplitude, and polari-zation, is presented.

TL;DR: A bit-level permutation and high-dimension chaotic map to encrypt color image and security analysis 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: An improved image encryption method based on permutation-diffusion architecture and total shuffling scheme is proposed and it can avoid the category of attacks similar to Ref.

TL;DR: As shearlet transform has the features of directionality, localization, anisotropy and multiscale, it is introduced into image fusion to obtain a fused image that contains more detail and smaller distortion information than any other methods does.

TL;DR: In this paper, techniques to generate microwave arbitrary waveforms based on all-fiber solutions are reviewed, with an emphasis on the system architectures based on direct space-to-time pulse shaping, spectral-shaping and wavelength to-time mapping, temporal pulse shaping and photonic microwave delay-line filtering.

TL;DR: A novel chaos-based bit-level permutation scheme for secure and efficient image cipher is proposed that is competitive with that of permutation–diffusion type image cipher, while the computational complexity is much lower and is a good candidate for real-time secure image communication applications.

TL;DR: Both theoretical analysis and experimental simulation indicate that the plain image can be recovered exactly from the cipher image without the secret key, so this algorithm is not secure enough to be applied in network communication.

TL;DR: Numerical simulations demonstrate that the proposed novel nonlinear image encryption scheme is robust with noise immunity, sensitive to the keys, and outperforms the conventional linear encryption methods to counteract some attacks.

TL;DR: In this encryption scheme the operations mentioned above are performed twice continuously, so the parameters of Arnold transform and the random angle serve as the key of the color image encryption method.

TL;DR: A novel chaos-based image encryption scheme with an efficient permutation-diffusion mechanism, in which permuting the positions of image pixels incorporates with changing the gray values ofimage pixels to confuse the relationship between cipher-image and plain-image, which can resist statistical attack, differential attack, known-plaintext as well as chosen-plain Text attack.

TL;DR: Results suggest that the proposed image encryption technique is robust and secure and can be used for the secure image and video communication applications.

TL;DR: An improved SVD-based watermarking technique considering human visual characteristics is presented and experimental results are provided to demonstrate the proposed approach is able to withstand a variety of image processing attacks.

TL;DR: In this paper, the authors demonstrated the thermal controllable reversible tunability of optical constants of VO 2 thin films and showed an abrupt thermal hysteresis which confirms clearly the electronic structural changes.

TL;DR: An efficient quantum protocol for comparing the equal information with the help of a semi-honest third party (TP) that utilizes the triplet W states and the single-particle measurement is proposed.

TL;DR: A new bilateral sharpness criterion is proposed to exploit both the strength and the phase coherence that are evaluated using the gradient information of the images to perform weighted aggregation of multi-focus images.

TL;DR: In this paper, a detailed study of the inscription and characterization of fiber Bragg gratings (FBGs) in commercial step index polymer optical fibers (POFs) was performed. And they found that FBGs in annealed commercial POFs can offer more stable short-term performance at both higher temperature and larger strain.

TL;DR: In this article, the Vernier effect was applied to two cascaded micro-rings resonators to improve the sensitivity of an integrated optical biosensor to 1300nm per refractive index unit (RIU), compared to 62nm/RIU for a single ring sensor.

TL;DR: In this paper, the relationship between refractive index and energy bandgap was investigated and the film thickness effect on the structural, morphological, optical and electrical properties of CdSe thin films was investigated.

TL;DR: In this paper, an optical fiber bend sensor with photonic crystal fiber (PCF) based Mach-Zehnder interferometer (MZI) is demonstrated experimentally.

TL;DR: In this article, the changes in various polarization properties of stochastic beams propagating through the turbulent clear-water ocean were determined based on the extended Huygens-Fresnel principle and the unified theory of coherence and polarization of light.

TL;DR: A new color image encryption algorithm based on fractional Fourier transform and chaos and using chaos scrambling technology to encrypt the image, which makes the resulting image nonlinear and disorder both in spatial domain and frequency domain.

TL;DR: Proposed logic gates have the potential to be key components for an optical packet switching system due to their small feature sizes and low power consumption.

TL;DR: An improved method for multiple-image encryption based on nonlinear operations in Fourier domain is proposed and the increase in the number of keys, removal of linearity and high robustness could be achieved in this cryptosystem.

TL;DR: In this article, a proper set of indices characterizing the polarimetric purity of light and material media is defined from the eigenvalues of the corresponding coherency matrix.

TL;DR: A basic optical encryption architecture that admits several cryptography applications based on multiplexing, where users can decrypt different private images from the same encrypted image, a superuser can have a key that decrypts all encrypted images, and multiplexed images can be encrypted with different levels of security.

TL;DR: In this paper, a sensor head consisting of a photonic crystal fiber (PCF)-based Mach- Zehnder interferometer (MZI) and afiber Bragg grating (FBG) is proposed and experimentally demonstrated for simultaneous measurement of curvature and temperature.

TL;DR: Numerical results are presented to demonstrate the feasibility and effectiveness of the proposed optical asymmetric cryptosystem for color image encryption.

TL;DR: A quantum protocol for the solution of a two-party comparison task with the help of a semi-honest third party, which can be used to solve the millionaire problem.

TL;DR: In this paper, a new application of the W-class state is investigated for quantum state sharing (QSTS) of an arbitrary three-qubit state, which is secure against certain eavesdropping attacks.

TL;DR: In this article, the authors reported a passive harmonic mode-locking of an Erbium/Ytterbium-doped double-clad fiber laser with repetition rates up to 10 GHz.