DETERMINATION OF ENERGY EFFICIENCY ACOUSTIC DEVICES IN THE OPTICAL TRANSPORT NETWORK USING 3D-ANALYSIS OF ELECTROMECHANICAL COUPLING
Journal Title: Вісник Національного університету "Львівська політехніка", серія "Радіоелектроніка та телекомунікації" - Year 2016, Vol 849, Issue 2016
Abstract
In this paper we investigate electromechanical coupling coefficient. We show the investigation importance of spatial distribution coefficient of electromechanical coupling. This parameter characterizes the energy efficiency of piezoelectric transducer that in turn affects the acousto-optic devices in optical transport networks. We present basic definitions and types of electromechanical coupling coefficient. We also show the formula for determining the coefficient of electromechanical coupling that facilitates study of the spatial distribution of this coefficient. We present a research model of spatial anisotropy for acoustic parameters and prospose an algorithm for constructing the indicative surface of electromechanical coupling coefficients for a particular direction of the radius vector. The radius vector coincides with the direction of acoustic waves propagtion by using the equation Green-Christoffel. We show the adequacy of the results by analyzing previous studies conducted on the plane X2X3 in LiNbO3 crystals. The indicative surface coefficients of electromechanical coupling have been constructed for the first time. This surfaces have been analyzed and maximum values have been defined. The indicative surfaces of electromechanical coupling coefficients do not exhibit a totally rotational symmetry with the axis of infinity order, what appears to be also consistent with the German’s theorem. According to the principle of CurieNeumann, the indicative surface is invariant here with respect to the symmetry operations of the point group 3m that describe the symmetry of the crystal structure of LiNbO3 crystals. The directions of efficient use of LiNbO3 crystal for acoustic device were determined. For transverse polarization directions of efficient 3 % utilization of piezoelectric transducer186 crystals LiNbO3 were determined. For longitudinal polarization the directions that could improve energy efficiency of acoustic devices were not found. We stress that further studies of the spatial distribution coefficient of electromechanical coupling to other piezoelectric materials should be conducted. We have concluded that the values of the sample orientation are different from the direction of the main planes of the sample and symmetry planes.
Authors and Affiliations
Mykola Kaidan
Keywords
Related Articles
- EP ID EP457743
- DOI -
- Views 110
- Downloads 0
MODELLING OF THE PLASMONIC PROPERTIES OF NANOCOMPOSITE MATERIALS BASED ON DIAMOND-LIKE CARBON FILM AND SILVER NANOPARTICLES
Optical characteristics of nanocomposite materials have been modeled depends on materials of the nanoparticles and the matrix, the size and shape of nanoparticles. The optical constants of diamond-like carbon films doped...
EXCITATION OF BULK ACOUSTIC WAVES BY INTERDIGITAL TRANSDUCER FROM THE SURFACE OF LITHIUM NIOBATE CRYSTALS
The excitation of bulk acoustic waves of the UHF range by interdigital transducer from the XY surface of lithium niobate crystals is considered. Experimental studies were carried out on acoustoelectronic delay lines, in...
RESEARCH OF THE FREQUENCY PLANNING METHODS FOR CELL NETWORKS BASED ON LTE AND GSM TECHNOLOGIES
Modern researches in field of mobile network depend on network infrastructure in a specific region. Nowadays, the actual issue is reforming of the existing frequency range for LTE deployment. The most common band is 900/...
DISTRIBUTION NETWORK FOR TELECOMMUNICATIONS SERVICES FOR SUBSCRIBERS OF EXPRESS TRAIN
This article describes the new concept of providing multimedia services, which require bandwidth 12 Mbit/sec, for mobile subscribers moving at speed of 250-350 km/h on train express. This concept is called – interactive...
MULTICHANNEL DATA TRANSMISSION SYSTEM IN THE SPLINE BASES
The article deals with multichannel digital data transmission system in which the digital signal is transmitted through the manipulation of the harmonic function which performs subcarrier function with different frequenc...