Binary optical arithmetic operation scheme with tree architecture by proper accommodation of optical nonlinear materials

Chowdhury, Kuladeep Roy; Mukhopadhyay, Sourangshu

doi:10.1117/1.1631003

Cited by 33 publications

(22 citation statements)

References 6 publications

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“…In last few decades, there are several proposed optical and photonic devices, which can be run with operation speed far above the conventional GHz limit. Many of those devices have been dedicated for performing 1 3 logic, arithmetic and algebraic operations to achieve the goal of all-optical computer and data processor [1][2][3][4][5][6]. Among all other components, memory is an essential one for any data processor.…”

Section: Introductionmentioning

confidence: 99%

An all optical approach of frequency encoded NOT based Latch using semiconductor optical amplifier

Dutta

Mukhopadhyay

2010

J Opt

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In case of super-fast optical computation and communication, frequency encoding techniques are found to be very promising and reliable one. Optical logic gates based on the principle of frequency conversion of some nonlinear materials play the key role for the implementation of a frequency encoded data processing system. Again semiconductor optical amplifier has already been established successfully for frequency conversion. In frequency encoding system, different frequencies of light signal are used for representation of binary bits 0 or 1 instead of intensity variation. For example 0 and 1 bits of Boolean logic can be coded by two different frequencies of light signaO and respectively. In this communication, we propose the method of developing an optical memory or a NOT based latch. Several types of phase encoded, polarization encoded and intensity encoded optical memories have been reported earlier, including latch also, whereas this proposal have been planned to develop an all optical latch logic using frequency encoded principle and it offers a reliable and faithful processing rather than other established techniques.

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Section: Introductionmentioning

confidence: 99%

An all optical approach of frequency encoded NOT based Latch using semiconductor optical amplifier

Dutta

Mukhopadhyay

2010

J Opt

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“…To get the output of a NOT logic gate, the observer should be at the position of channel O 2 . Several all optical logic and arithmetic devices have been proposed which are based on this type of switching [6,9] . An optical J-K Flip-flop which is nothing but a bi-stable multivibrator has been also proposed on this concept of switching [10] .…”

mentioning

confidence: 99%

“…Nonlinear optical devices come in the frontline of such ways of optical information processing. Many high-speed operations have been implemented by the use of optical non-linear material [7][8][9] . We know that many isotropic non-linear materials (such as pure silica glass, CS2 etc.)…”

mentioning

confidence: 99%

Development on astable multivibrators using the combination of linear and non-linear materials as switching elements based on all optial method

Mitra

Mukhopadhyay

2009

Optoelectron. Lett.

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In this communication we propose a method to implement an all-optical astable multivibrator using the non-linear material based switches and logic gates. The scheme can operate in real time. The delay time can achieve ps(pico-second). The pulse duration can be made very low and may cross the THz easily by selecting proper material and laser source.The roles of switches are essential and obvious in any information processing mechanism. Different all-optical switches are already developed by scientists. Also the all-optical logic gates are developed using the combination of linear and nonlinear optical materials. Several memory devices, such as all optical clocked R-S flipflop, J-K flip flop etc., are developed using this switching mechanism of non-linear material. Here, the authors propose a new proposal to develop an astable multivibrator using NOT (Inversion) logic gate, which are all optical in nature. It is widely established that super fast computation can deal with photon easily [1][2][3] . In this connection different all-optical logic devices are already developed around the world by the last few decades [4][5][6] .Inherent parallelisms of an optical signal over its electronic counterpart can be exploited in several ways. Nonlinear optical devices come in the frontline of such ways of optical information processing. Many high-speed operations have been implemented by the use of optical non-linear material [7][8][9] . We know that many isotropic non-linear materials (such as pure silica glass, CS2 etc.) follow the refractive index relation as where n is the refractive index (r.i) of a non-linear material, n 2 is the non-linear correction term, n 0 is a constant linear r. i term and I is the intensity of light passing through the material. This helps us to understand the basic switching operation using nonlinear material with an optical signal. In Fig.1 we n = n 0 + n 2 I , have shown an optical switch. Here X and Y are the two inputs each with a prefixed intensity I, M is the mirror used to change the path, and B.S is the beam splitter or combiner. When both of the inputs are present, the refracted output will pass through O 1 channel and when any one of them is present, the output will be obtained through O 2 channel. This happens according to the above nonlinear equation and Snells' law. Now we discuss the basic operation of logic NOT gate using the combination of linear and non-linear materials and above switching mechanism.The schematic diagram of NOT logic gate can be understood also by Fig.1. Here X is the input channel and CLS represents the constant light source Y, which both have a specified intensity I 1 . The output channels are O 1 and O 2 . When the input channel X does not have any light signal i.e. at the logic state 0, then light goes through channel O 2 ;and when X is in a logic state 1, i.e. it has light with a specified intensity, then light follows the channel O 1 . To get the output of a NOT logic gate, the observer should be at the position of channel O 2 . Several all optical logic an...

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“…1 Alloptical signal processing and computing operation fundamentally rely on material nonlinearities. [2][3][4] All-optical logic devices based on nonlinearities in semiconductor optical amplifiers ͑SOAs͒ have recently attracted considerable research interest.…”

Section: Introductionmentioning

confidence: 99%

<inline-formula><math altimg="none" display="inline" overflow="scroll"><mrow><mn>40</mn><mspace width="0.3em" /><mi>Gbit</mi><mo>∕</mo><mi mathvariant="normal">s</mi></mrow></math></inline-formula> all-optical logic NOR gate based on a semiconductor optical amplifier and a filter

Zhang

Feng

et al. 2006

Opt. Eng

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Binary optical arithmetic operation scheme with tree architecture by proper accommodation of optical nonlinear materials

Cited by 33 publications

References 6 publications

An all optical approach of frequency encoded NOT based Latch using semiconductor optical amplifier

An all optical approach of frequency encoded NOT based Latch using semiconductor optical amplifier

Development on astable multivibrators using the combination of linear and non-linear materials as switching elements based on all optial method

<inline-formula><math altimg="none" display="inline" overflow="scroll"><mrow><mn>40</mn><mspace width="0.3em" /><mi>Gbit</mi><mo>∕</mo><mi mathvariant="normal">s</mi></mrow></math></inline-formula> all-optical logic NOR gate based on a semiconductor optical amplifier and a filter

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