We propose and experimentally demonstrate a WDM-PON architecture supporting point-to-point, broadcast,
and multicast services based on hybrid modulation format. Wireless access for multicast data is provided using
optical carrier suppression (OCS) technology.
We propose and experimentally demonstrate a reconfigurable all-optical VPN scheme enabling
intercommunications among different ONUs in a WDM PON. Reconfiguration is realized by
dynamically setting wavelength conversion of optical VPN signal using a SOA in the OLT.
KEYWORDS: Extremely high frequency, Medium wave, Radio over Fiber, Modulators, Eye, Signal generators, Single mode fibers, Signal detection, Hybrid fiber radio, Telecommunications
We propose and experimentally demonstrate a simple and cost-effective bi-directional RoF system for simultaneous
transmission of downstream baseband, MW and MMW signals based on a single-drive Mach-Zehnder modulator
(MZM). Upstream data transmission is realized by re-modulation of downstream signals.
We propose an ultra-broadband optical parametric amplifier (OPA) employing step-structure hybrid plasmonic
waveguide with ultra-high nonlinearity. The proposed parametric amplifier possesses a net signal gain of larger than
14 dB and a 3-dB bandwidth of over 200 nm covering C-band, L-band, and S-band.
KEYWORDS: Resonators, Silicon, Microrings, Signal generators, Extremely high frequency, Waveguides, Integrated optics, Radio over Fiber, System integration, Modulators
We propose a prototype of a silicon-chip-based frequency quadrupling system integrating a single-drive silicon Mach-
Zehnder modulator and a race-track resonator as an optical differentiator. A proof-of-concept demonstration of 40-GHz
millimeter-wave signal generation using 10-GHz driving signal is experimentally provided. The factors that impacting
the purity of the RF spectrum are discussed through simulation.
We propose a 40Gbit/s star-16QAM(to define) system based on ISI(to define)-suppression
technology and coherent detection. ISI-free BPSK optical signals generated by Mach-Zehnder
modulators (MZM) and continuous wave (CW) lights are used to realize a star-16QAM signal. As a result,
the obtained star-16QAM signal is also ISI-free. It turns out that the proposed ISI free star-16QAM has
better performance in terms of eye opening and constellation diagram comparing with two conventional
star-16QAM signals transmitted through 80-km standard single-mode fiber (SSMF) and detected by a
coherent receiver.
We show that a ring resonator with mutual modes coupling can achieve pulse delay or advancement of tens nanoseconds,
which is similar as a ring resonator with single mode. Nevertheless, the pulse response can be sensitively
tunable either through mutual mode coupling or through waveguide-ring coupling in the vicinity of resonant frequency.
We propose a novel deringing scheme based on the concept of a trilateral filter—an extension of the bilateral filter that consists of domain, range, and texture activity filters. The domain and range filters are used to measure image geometrical similarity and photometric similarity, respectively, while the texture activity filter helps to preserve image details during postprocessing. An image texture map is first computed with a dual-edge detection process. This texture map is then utilized to adjust the trilateral filter for effectively protecting the image detail from oversmoothing. Experimental results are provided to justify the algorithm.
The lattice structure and electronic properties of perfect CoSi2 and NiSi2 have calculated using an ab initio plane-wave ultrasoft pseudopotential method based on the generalized gradient approximations (GGA). Special attention is paid to the formation energies of the vacancy, which largely depend on the atomic chemical potentials of Si and metal atom: in Si-rich limit, the formation energies of Si and Co vacancies are 2.39 eV and 0.56 eV whilst those are 1.53 eV and 2.29 eV in Co-rich limit in CoSi2, respectively. For NiSi2, the formation energies of Si and Ni vacancies are 0.56 eV and 1.25 eV in Si-rich limit and those are 0.04 eV and 2.3 eV in Ni-rich limit.
Microwave hydrogen plasma annealing of sputter-deposited cobalt films on Si(100) substrate was utilized to form CoSi2 films which were characterized utilizing X-ray diffraction(XRD), Auger electron spectra(AES) sputter depth profile and cross-sectional Field Emission Scanning Electron Microscope (FESEM). Polycrystalline CoSi2, dominated by components with (111), was grown at the annealing temperature 600°C whereas microwave hydrogen plasma annealing at 750°C made components with (100) dominated. Moreover, it speculates that microwave anneal which promote Co atoms diffusion into Si substrate for nano-meter cobalt film during microwave anneal.
In this paper we report on the design and performance of the large KDP crystal plates that were constructed to convert 1.054 micrometer laser beam to its third harmonic. The KDP crystals were AR-coated by sol-gel films. Type II/type II phase-matching configurations for cascade frequency doubling and tripling have been implemented at 250 mm aperture. High conversion efficiencies approaching to 70% were achieved. Focusing properties of harmonic beam are also investigated in the paper. Based on the transfer of electric-field amplitude and phase ripple in frequency tripling, simple formulas are derived for the harmonic laser beam-quality factor, M3(omega )2, with an arbitrary fundamental beam incident to ideal nonlinear crystals. Harmonic beam-quality is generally degraded, while the beam divergence is similar to that of the fundamental after a nonlinear frequency-conversion process. For practical crystals with periodic surface ripples due to their machining, a multi-order diffractive model is presented to study the focusing properties of harmonic beam. Predictions of the theories are shown to be in excellent agreement with full numerical simulations of tripling.
The gain saturation of Nd-glass amplifier is determined by the relaxation rate of populations. The influences of the thermalization rates among the components of the multiplets to which the laser levels belong and of the depletion rate of terminal laser level are investigated in detail. A modified Frantz-Nodvik model in consideration of the influence of thermalization and depletion between laser levels is obtained. By solving these differential equations, we calculated a practical amplifier. The results indicate that the output of the amplifier can increase remarkably when the thermalization time decreases to pulse duration.
Propagation of optical field through an optical system characterized by an ABCD ray matrix has been investigated in the spatial frequency domain. The behavior of the angular spectrum of the optical field can be directly obtained by use of the diffraction integral in spatial frequency domain which has been derived by this paper. Some examples have shown that for some problems it is more convenient to study in frequency domain by using the frequency-domain diffraction integral formula than in spatial domain.
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