Logic gates based in two- and three-modes nonlinear optical fiber couplers

被引：51

作者：

Menezes, J. W. M. ^{[1
]}

de Fraga, W. B. ^{[1
]}

Ferreira, A. C. ^{[1
,2
]}

Saboia, K. D. A. ^{[1
]}

Filho, A. F. G. F. ^{[1
,2
]}

Guimaraes, G. F. ^{[1
,2
]}

Sousa, J. R. R. ^{[1
]}

Rocha, H. H. B. ^{[1
,2
]}

Sombra, A. S. B. ^{[1
]}

机构：

[1] Univ Fed Ceara, Lab Telecomunicacoes & Ciencia & Engn Mat LOCEM, Dept Fis, BR-60455760 Fortaleza, Ceara, Brazil

[2] Univ Fed Ceara, Dept Engn Teleinformat, Ctr Tecnol, BR-60455760 Fortaleza, Ceara, Brazil

来源：

OPTICAL AND QUANTUM ELECTRONICS | 2007年 / 39卷 / 14期

关键词：

logic gates; optical waveguide;

D O I：

10.1007/s11082-008-9186-9

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

In this paper we did a study of logic gates obtained in the operation of a three-core non linear directional coupler (TNLDC) and an asymmetric two-core coupler (DNLDC) operating in the CW regime (the laser signals have the same wavelength). The symmetric three-core coupler (TNLDC), with their cores identical, in a planar arrangement, was studied using a control pulse applied to the first core. The second structure is an asymmetric two-core coupler (DNLDC). Looking at the transmission characteristics of the device, through the direct and cross channel, we did a study of the extinction ratio (Xratio) of these devices. For both devices we did a numerical investigation with the objective to implement logic gates. The DNLDC supplied AND, OR and XOR gates while the TNLDC supplied AND, NAND, OR, XOR and NOT gates. In comparing the performance of both switches operating as logic gates (DNLDC and TNLDC) we define, for the first time, a figure-of-merit of the logic gates (FOMELG). In this criteria the FOMELG is defined as a function of the extinction ratio of the gate outputs. Comparing the same gates of the three and two-core NLDC we observe that the logical gates of the three-core TNLDC present a better performance than the one of the two-core DNLDC considering the figure of merit FOMELG, besides the fact that is simpler to fabricate a symmetrical coupler (with identical cores) comparing with an asymmetric coupler. We believe that the use of this figure of merit will be useful in the study of the performance of logic gates to be used in communication systems.

引用

页码：1191 / 1206

页数：16

共 45 条

[1]

Agrawal G., 2001, Nonlinear Fibers Optics, V3rd

[2] NOVEL SOLITON STATES AND BIFURCATION PHENOMENA IN NONLINEAR FIBER COUPLERS [J].