A Novel All-Optical Frequency-Encoded Method to Develop Arithmetic and Logic Unit (ALU) Using Semiconductor Optical Amplifiers

• Published in: Journal of lightwave technology Vol. 29; no. 23; pp. 3506 - 3514
• Main Author: Garai, S. K.
• Format: Journal Article
• Language: English
• Published: New York, NY IEEE 01.12.2011; Institute of Electrical and Electronics Engineers
• Subjects: add/drop multiplexer (ADM); Adder; Adders; All optical circuits; Applied sciences; arithmetic unit; Circuit properties; Electric, optical and optoelectronic circuits; Electronics; Exact sciences and technology; Frequency conversion; Frequency division multiplexing; Integrated optics. Optical fibers and wave guides; Laser excitation; Logic gates; nonlinear polarization rotation (NPR); Optical and optoelectronic circuits; Probes; semiconductor optical amplifier (SOA); Semiconductor optical amplifiers; subtractor; Switching and signalling; Systems, networks and services of telecommunications; Telecommunications; Telecommunications and information theory; Transmission and modulation (techniques and equipments); Frequency dependence; Cross gain modulation; Multiplication; Optical logic; semiconductor optical amplifier (SOA); Optical computing; XOR circuit; Frequency conversion; arithmetic unit; Optical frequency; Frequency control; Semiconductor optical amplifiers; Logic circuit; Optical method; nonlinear polarization rotation (NPR); Comparator circuit; Arithmetic circuit; Routing; Data processing; add/drop multiplexer (ADM); Adder; All optical circuit; Arithmetic logic unit; subtractor; Optical beam; Integrated circuit; Optical add drop multiplexer; Arithmetic operation
• ISSN: 0733-8724; 1558-2213
• DOI: 10.1109/JLT.2011.2170209

An all-optical arithmetic and logic unit is the integral part of optical computing and data processing. In this paper, the author proposes a method to develop an all-optical arithmetic and logic unit by means of which so many binary logic operations such as AND, OR, NAND, NOR, EXOR, data comparator etc., as well as some arithmetic operations, such as half-addition, half-subtraction, full-addition, full-subtraction multiplication, etc., can be performed by properly selecting the frequencies of the control signals and using the frequency encoded input data. For this purpose, the author has exploited the frequency conversion scheme of semiconductor optical amplifier (SOA) using nonlinear polarization rotation character of the probe beam in SOA and, cross-gain modulation character of reflecting semiconductor optical amplifier (RSOA). Frequency-dependent optical beam routing to different channels have done using optical add/drop multiplexer made of SOA with multiquantum well structure. Frequency conversion efficiency of SOA and RSOA are very high as well as switching speed of SOA is very fast with very good ON-OFF contrast ratio.