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ALL OPTICAL 3-BIT SERIAL INPUT SHIFT REGISTER DESIGN

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Author(s): VIKRANT K SRIVASTAVA, | DEVENDRA CHACK, | VISHNU PRIYE

Journal: International Journal of Engineering Science and Technology
ISSN 0975-5462

Volume: 2;
Issue: 8;
Start page: 3989;
Date: 2010;
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Keywords: Shift Register | Optical Logic Gates | Semiconductor Optical Amplifier | SOA | four wave mixing | cross gain modulation | cross phase modulation

ABSTRACT
In this Paper, we present all-optical shift Register logic with complete Boolean functionality as a representative circuit for modeling and optimization of monolithically integrated components. Proposed optical logic unit is based on nonlinear effects in semiconductor optical amplifiers (SOA). We show a strategy of optical pulse propagation in SOA based on coupled nonlinear equations describing XGM and FWM effects. These equations are first solved togenerate the pump, probe and conjugate pulses in a SOA. The pulse behavior are analyzed and applied to realize behavior of all-optical NAND gate. Next, the logic is used to implement All-Optical Flip-Flop logic, and its function is verified with the help of truth table. Finally with the help of three Flip Flop a 3-bit shift register is proposed. The full design is simple, compact, economical, thermally stable and integration capable.
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