نتایج جستجو برای: optical filter
تعداد نتایج: 384777 فیلتر نتایج به سال:
We propose an optical system for synthesizing double-phase complex computer-generated holograms using a phase-only spatial light modulator and a phase grating filter. Two separated areas of the phase-only spatial light modulator are optically superposed by 4-f configuration with an optimally designed grating filter to synthesize arbitrary complex optical field distributions. The tolerances rela...
Reshaping of ultrashort optical pulses at 1.53 ,um by using an integrated acousto-optic tunable filter is reported. Control of the optical pulse shape is accomplished by adjusting the different radio-frequency electrical signals driving the acousto-optic filter. This is to our knowledge the first demonstration of ultrashort pulse shaping using an integrated-optic device and establishes a new ap...
Intersymbol interference in direct detection optical systems can limit the channel spacing in frequency division multiplexing systems, and limit data rates and transmission distances in long distance transmission systems. We present minimum mean-square-error electrical filters to compensate for optical intersymbol interference. The performance of these filters is compared with a matched filter ...
The penalties associated with filter concatenation in the optical nodes of an optical network are experimentally assessed and the susceptibility of a transmission system to laser misalignment is investigated. The performance of a number of filter types are modelled. Thin film filters are suited to networks with large numbers of optical nodes while AWGs are more appropriate for high channel coun...
In this Letter, based on the Richards and Wolf diffraction theory, an ultralong optical needle with pure transverse polarization is numerically generated by tightly focusing an azimuthally polarized beam through an annular vortex binary filter. Such an ultralong transversely polarized optical needle is generated through the π phase shift between adjacent rings of the binary filter. We show that...
A free-space silicon one-dimensional photonic bandgap optical filter is designed and fabricated. A two-stage (110) wafer etching process is employed to form the extremely vertical, smooth, and high-aspect-ratio features that are essential for good optical properties. The (111) oriented planes of the wafer form <0.01 degrees off-vertical trenches that make up the Fabry-Perot filter. A simulation...
Based on a fluorescence imaging model, the optical filters, such as excitation and emission filters, are determined by linear discriminant analysis. The discriminability is a quadratic Rayleigh quotient of one filter if the other filter is assumed to be constant. The optical filters are optimized alternatingly and iteratively by solving their generalized eigenvalue problems. The proposed method...
In this paper, the optical properties of the multilayer rugate filter by structure of (HL) ^ 9Hhas been investigated. Here the reflection, optical density and electric field strength of designed filter by using four materials of Ta2O2, Nb2O5 and ZnS as the materials with high refractive indexandSiO2as a material with low refractive index are compared with each other. Finally, it is realized tha...
We report our experimental results for linear analog optical links that use phase or frequency modulation and optical discrimination. The discriminators are based on two architectures: a cascaded MZI FIR lattice filter and a ring assisted MZI (RAMZI) IIR filter. For both types of discriminators, we demonstrate > 6 dB improvement in the link's third-order output intercept point (OIP3) over a MZM...
The impact of ultra-fast carrier dynamics in semiconductor optical amplifiers (SOAs) on switches based on cross-gain and cross-phase modulation is analyzed theoretically and experimentally. We find that ultra-fast effects lead to additional spectral broadening, which improves the optical signal-to-noise ratio for switches based on an SOA and an optical filter. For such switches, the influence o...
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