This thesis, based on the design methods of optical devices and requirements of communication system, mainly analyses the inter-device coupling process , and has designed some optical devices in theory, some of which are substantiated in experiment.
This paper introduces the latest technical trends of optical fiber, optical devices and network components used in the fiber transmission networks for dense wavelength division multiplexing in the world, and analyzes its development and the influence on the markets of optical fiber and cable in China.
Two types of optical devices, planar lightwave circuits (PLCs) and liquid crystal (LC) devices used in optical communications, are considered in this thesis. Novel structures, new calculation methods and new design methods are proposed in developing these two type devices.
Considering the current development of optical device technologies and the network interconnection schemes, this thesis presents a novel national transport network architecture which combines the Optical Time Division Multiplexing (OTDM) and Optical Wavelength Division Multiplexing (OWDM) technologies.
Some problems and challenges confronted by optical metropolitan area networks are analyzed in this paper. Based on the analysis, key networking and new optical device technologies for optical metropolitan area networks are discussed, and the development trends of optical metropolitan area network are forecasted.
Optical burst switching (OBS), which combines the merits of wavelength routing and optical packet switching while avoiding their defects, can provide IP based resource assignment and switching at high speed with low demand for optical components in the all-optical networks.
In the first chapter of this paper, the basic structure, characteristics, and the development as well as some key optical components of optical networks are introduced, and the main issues of reliability and survivability of the optical networks are reviewed.
An Optical Device for Determining the Local Characteristics of Crystals by Means of Counterpropagating Laser Beams
An optical device designed for nondestructive quality control and measurements of local characteristics in bulks of crystals and other optical elements with a spatial resolution of the order of 0.1 mm is described.
The changes in the dynamic range of an acousto-optical device are calculated for different diffraction efficiencies.
The effective molecular second-order hyperpolarizability γeff of the BuCo molecule was estimated to be as large as 5.60 × 10-31 esu, suggesting BuCo is a potential material for optical device applications.
In optical Integrated circuits (OIC) and optical device design (passive and active), the index of refraction profile is a coordinate dependent parameter.
Fresnel reflection in optical components and detectors for the terahertz frequency band
This interference causes the characteristics of optical components and detectors to be dependent on the wavelength.
In dwarfs with rotational velocities of about 100 km/s, such as the optical components of low-mass X-ray novae with black holes, hot plasma can be confined in coronal loops even in the presence of fairly weak magnetic fields.
We present the results of calculations of theoretical absorption-line profiles and radial-velocity curves for optical components in X-ray binary systems.
This can explain the magnitude of the observed luminosity excess and the position of the optical components of X-ray binaries in the luminosity-radius plane.
Thus, the soft X-ray emission of such systems in their quiescent state (to 1031 erg/s) could be associated with the coronal emission of the optical component/dwarf.
This suggests that the quiescent X-ray emission of these two systems is provided by emission from the corona of the subgiant optical component.
Numerical simulations of the evolution of GRS 1915+105 at the X-ray stage indicate that the most probable initial mass of the optical component (donor star) is (1.5-)M⊙.
If the initial mass of the optical component was (2.5-)M⊙, the system underwent a common-envelope phase; in this case, the initial mass of the black hole progenitor did not exceed ～50M⊙.
We derived the dependence of the mass of the X-ray emitting component mx on the mass of the optical component mv via an analysis of the radial-velocity curve based on profiles of the CaI 6439.075 ? absorption line synthesized in a Roche model.
This paper describes the design and the fabrication of large number of spots high stability and high switching speed frequency synthesizer for acousto optic deflection.
Abstract- This paper presents a new method which can directly measure the average flow rate. The operation mechanism relies upon counting synchronously both the equi-amplitude driving signals in the acoustoc-ptic device of the system and harmonic components of the doppler sig-nals. Thus in the new system the filter used in ordinary doppler systemic not needed.
A new optical system for real-time pattern recognition is presented, which mainly consists of a laser diode, an acoustooptic device with multi-transducer, a charge-coupled device and optical lenses. Neither the coherent optical input image nor the Fourier transform hologram of the reference image is required by this system. Real-time video signals from imaging system operating in different spectrum and the reference images either pre-recorded or acquired in real-time can be applied to the present system. Theoretical...
A new optical system for real-time pattern recognition is presented, which mainly consists of a laser diode, an acoustooptic device with multi-transducer, a charge-coupled device and optical lenses. Neither the coherent optical input image nor the Fourier transform hologram of the reference image is required by this system. Real-time video signals from imaging system operating in different spectrum and the reference images either pre-recorded or acquired in real-time can be applied to the present system. Theoretical analysis is given to describe the system operation. Experimental results have confirmed that this incoherent optical correlator system possesses the capability of performing real-time pattern recognition. In fact, the image shift, scale, rotation invariance problems encountered in some pattern recognition tasks can easily be solved in this system.