Mechanical Operation Stage II

West Bengal, India

Mechanical Operation Stage II

West Bengal, India

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A new and novel scheme for a high speed all-optical half adder based on single Quantum-dot semiconductor optical amplifier (QD-SOA) assisted Mach-Zehnder interferometer (MZI) is theoretically investigated and discussed. In this proposed scheme, pair of input data streams are simultaneously drive the switch to produce sum and carry. In this new design, only single switch can be utilized to design half adder circuit and no additional input beam is required other than two input signals. This design is simpler, smaller and compact than our previously proposed design . The impact of the peak data power as well as of the QD-SOAs current density and maximum modal gain on the ER, Q factor with current densities and electron relaxation times etc are explored and assessed by means of numerical simulations. © 1983-2012 IEEE.


Chattopadhyay T.,Mechanical Operation Stage II
Optics and Laser Technology | Year: 2010

Symmetric ternary number (radix=3) has three logical states (1-, 0, 1). It is very much useful in carry free arithmetical operation. Beside this, the logical operation using this type of number system is also effective in high speed computation and communication in multi-valued logic. In this literature all-optical circuits for three basic symmetrical ternary logical operations (inversion, MIN and MAX) are proposed and described. Numerical simulation verifies the theoretical model. In this present scheme the different ternary logical states are represented by different polarized state of light. Terahertz optical asymmetric demultiplexer (TOAD) based interferometric switch has been used categorically in this manuscript. © 2010 Elsevier Ltd. All rights reserved.


Chattopadhyay T.,Mechanical Operation Stage II
Optical Fiber Technology | Year: 2011

The design of all-optical 2 × 2 Terahertz Optical Asymmetric Demultiplexer (TOAD) based interferometric switch is proposed and described in this manuscript. Numerical simulation has been done to achieve the performance of the switch. Using this 2 × 2 TOAD based switch, cross-bar network architecture is designed. A reconfigurable logic unit is also proposed in this manuscript, which can perform 16-Boolean logical operations. © 2011 Elsevier Inc. All rights reserved.


Chattopadhyay T.,Mechanical Operation Stage II
Applied Optics | Year: 2011

Logic units are the building blocks of many important computational operations likes arithmetic, multiplexer- demultiplexer, radix conversion, parity checker cum generator, etc. Multifunctional logic operation is very much essential in this respect. Here a programmable Boolean logic unit is proposed that can perform 16 Boolean logical operations from a single optical input according to the programming input without changing the circuit design. This circuit has two outputs. One output is complementary to the other. Hence no loss of data can occur. The circuit is basically designed by a 2 × 2 polarization independent optical cross bar switch. Performance of the proposed circuit has been achieved by doing numerical simulations. The binary logical states (0,1) are represented by the absence of light (null) and presence of light, respectively. © 2011 Optical Society of America.


A flip-flop (FF) is a kind of latch and the simplest form of memory device, which stores various values either temporarily or permanently. Optical FF memories form a fundamental building block for alloptical packet switches in next-generation communication networks. An all-optical clocked delay FF using a single terahertz optical asymmetric demultiplexer-based interferometric switch is proposed and described. Numerical simulation results are also reported. © 2010 Optical Society of America.


Chattopadhyay T.,Mechanical Operation Stage II
IET Optoelectronics | Year: 2013

Conventional irreversible computer is power dissipative. Data loss is the major problem in such computation, but it can be minimised with a special circuit design. In this study optical 'double controlled logic' (DCL) circuit is proposed, which can minimise the circuit complexity and power cost. The mathematical model of the DCL circuit is given in this study, which also has good cascadability and compactness. Some complex logic circuits (16-Boolean logic unit, grey-to-binary-to-grey code conversion and cross-bar network architecture) using controlled logic unit have also been proposed in this study. The circuits also have reversible property. The performance of the proposed circuits from the viewpoint of optical cost, optical delay and switching energy is also discussed in this study. © The Institution of Engineering and Technology 2013.


All-optical logic device is a vital element in ultra high speed all-optical networks. If the element is programmable then the device become more sophisticated and user friendly. In this study, a compact all-optical programmable Boolean logic unit (PBLU) is proposed using two cascaded semiconductor optical amplifiers on the Mach-Zehnder interferometer arms-based switches. PBLU can perform any of the 16-Boolean all-optical logical operations (False, AB, AB̄, A, ĀB, B, A⊕B, A+B, ĀB̄, AȯB, B̄, A+B̄, Ā, Ā+B, Ā+B̄, True) according to the programming input. The performance of the circuit is evaluated through numerical simulation, which confirms its feasibility in terms of the choice of the critical parameters. © 2011 The Institution of Engineering and Technology.


Chattopadhyay T.,Mechanical Operation Stage II
Optics and Laser Technology | Year: 2013

Optical circuits of different logical operations using binary decision diagram (BDD) are proposed and described in this paper. A simple table-top model using plane mirrors based on this architecture has been shown in this manuscript. This model is the macroscopic form of micro-electromechanical (MEMS) optical switch, which is also described in this manuscript. Numerical simulations using torsion type micromirrors have been done to find its operational performance. The design is simple and easy to implement for higher bit also. © 2013 Elsevier Ltd.


All-Optical XOR Logic is a key technology for performing a set of operations in optical time division multiplexing (OTDM) multi-access network. In this paper an All-Optical Boolean XOR logic gate with Terahertz Optical Asymmetric Demultiplexer (TOAD) based interferometric switch is designed and described. In this proposed XOR gate, no additional input light source is used. Numerical simulation is also presented, which verifies the theoretical results. Contrast ratio, extinction ratio, amplitude modulation, bit error rate and signal to noise ratio values have also been analyzed. © 2010 Elsevier GmbH. All rights reserved.


Chattopadhyay T.,Mechanical Operation Stage II
Optics and Laser Technology | Year: 2013

Logic units are the basic building blocks of many complex computational operations. In this paper an optical circuit using simple optical components has been proposed which is capable to perform all 16-optical logic (two variables) operations without changing the design of the circuit. The circuit has two outputs, one is complement to the other and hence optical input data must be at any one output. So, no data loss happens during the operation. © 2012 Elsevier Ltd.

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