A tristate optical logic system

Basuray, A.; Mukhopadhyay, Sourangshu; Ghosh, Hirak Kumar; Datta, Anuja

doi:10.1016/0030-4018(91)90388-t

Cited by 27 publications

(4 citation statements)

References 10 publications

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“…Under this design, by resolving the polarity and magnitude of the I photo , we obtain the "TOR" gate truth table shown in Figure 6b. [50,51] Meanwhile, the I photo curve of the "TOR" gate in response to the input of voltage and light is shown in Figure 6c. To the best of our knowledge, this is the first time to report that the PEC PD-based device realizes the traditional "TOR" gate of ternary inputs and ternary outputs.…”

Section: Realization Of Ternary "Or" Gate-a Three-valued Logic Functionmentioning

confidence: 99%

Reprogrammable Binary and Ternary Optoelectronic Logic Gates Composed of Nanostructured GaN Photoelectrodes with Bipolar Photoresponse Characteristics

Luo

Wang

Kang

et al. 2023

Advanced Optical Materials

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The elementary electronic‐logic‐gates, performing basic logic functions using electric signals as input, act as a building block of modern digital circuits. Intriguingly, the optoelectronic‐logic‐gates (OLGs), composed of optical devices, are emerging as a new logic platform which enables faster and large‐capacity data transmission and processing by using photons as input. However, the strict operation principle of classic optical devices, for example, the unidirectional photoresponse of the photodetector, restricts the functional enrichment of OLGs. Herein, reprogrammable OLGs in a photoelectrochemical (PEC)‐environment are reported by employing gallium‐nitride semiconductor p–n nanowires as photoelectrodes where bidirectional photocurrent is achieved, leading to the demonstration of various binary OLGs including “NOT”, “XOR”, and “OR”. Strikingly, thanks to the versatile tunability of PEC‐photoelectrodes, the logic function of these OLGs is switchable by simply adjusting programming inputs including light intensity, bias voltage, electrolyte condition, and the physicochemical properties of the nanowire surface. Most importantly, unique ternary OLGs, for example, ternary “OR” gates, can also be realized based on binary ones by just tuning their applied bias for higher logic complexity applications, without changing the device architecture. Such reprogrammable binary and ternary OLGs could provide a new avenue toward next‐generation logic circuits for fast computing and data‐processing in the future.

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Section: Realization Of Ternary "Or" Gate-a Three-valued Logic Functionmentioning

confidence: 99%

Reprogrammable Binary and Ternary Optoelectronic Logic Gates Composed of Nanostructured GaN Photoelectrodes with Bipolar Photoresponse Characteristics

Luo

Wang

Kang

et al. 2023

Advanced Optical Materials

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show abstract

“…Here inputs and outputs were binary signals [24]. Then many proposals have been done by means of intensity coded system [25], polarization encoded shadow casting scheme [26][27][28], fringe shift techniques [29], parallel optical negative binary sign digit system [30][31][32][33], mirror symmetrical arithmetic [34], Optoelectronic system [35,36], optical modified signed digit number (MSD) [37][38][39][40][41][42][43][44][45][46] frequency encoded system [47], optical modified ternary number (MTN) system [48,49], polarization encoded optical devices [50] respectively. In MVL implementation, intensity coded logical states is a bad choice because intensity loss happens due to absorption and attenuation at different portions of the circuit.…”

Section: Introductionmentioning

confidence: 99%

Design of optical reconfigurable balanced ternary arithmetic logic unit using MEMS based design

Chattopadhyay

2015

Optics Communications

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“…The basic logic gates and the flip-flops are also reported [4][5][6][7][8][9][10] in MTN system using spatial light modulators (SLM) and savart plates. The flip-flops are the basic building block of sequential logic system.…”

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confidence: 99%

Trinary registers and counters using savart plate and spatial light modulator for optical computation in multivalued logic

Ghosh

Raul

2009

Optoelectron. Lett.

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Registers and counters are the most important devices in any system of computations. In this paper we have communicated the trinary registers and counters in modified trinary number (MTN) system. It is suitable for the optical computing and other applications in multivalued logic system. Here the savart plate and spatial light modulator (SLM) based optoelectronic circuits have been used to exploit the optical tree architecture (OTA) in optical interconnection network.The carry and borrow-free mathematical operations are possible with modified trinary number (MTN) system [1][2][3] . The basic logic gates and the flip-flops are also reported [4][5][6][7][8][9][10] in MTN system using spatial light modulators (SLM) and savart plates. The flip-flops are the basic building block of sequential logic system. Any sequential logic system can be designed by using the flip-flops and the combinational logic units. One of the most important sequential circuits used in computing system is the register. A register consists of a group of flipflops that can store information. Since a trinary flip-flop [10] can store 1 trit of information, a n-trit word register requires n number of flip-flops connected in cascaded, i.e. the output of one flip-flop is connected to the input of another.In this paper we have communicated the implementation of trinary valued different shift registers and counters by using the clocked D-trinary flip-flops. The basic optical logic gates in MTN system have been used to implement the same. The basic clock pulse in trinary system is also used here. A mode control selector (MCS) is used to convert the D-trinary flip-flop into clocked D-trinary flip-flop. To implement the shift registers the MCS is used to implement the parallel and serial shift. The circuit implementations and the truth tables for the shift counter, ring counter and the ripple counters are discussed in details.Before going into the details a short introduction to the basic logical system of trinary along with the process of implementation is given. The three states of the trinary representation are classified as the true, false and contradiction as shown in Tab.1. The truth states for the trinary logic gates required to implement the trinary flip-flops, registers and counters are mentioned in Tab.2. The basic logic gates and their output functions have been defined earlier [5] . The required gates as mentioned may be implemented [5] by using the basic building block discussed hereunder.For the implementation of the logical operations as mentioned we have used a basic building block given in Fig.1. A light from a laser source L through a polarizer P is incident on the first savart plate S 1 . The basic property of a savart plate is that if a light polarized at a direction of 45 0 with the vertical axis as shown in the Fig.1, is incident on it, the output will be two parallel beams shifted between themselves. The state of polarization of the output beams is orthogonal to each other as shown. The output beams may be controlled (the presence o...

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A tristate optical logic system

Cited by 27 publications

References 10 publications

Reprogrammable Binary and Ternary Optoelectronic Logic Gates Composed of Nanostructured GaN Photoelectrodes with Bipolar Photoresponse Characteristics

Reprogrammable Binary and Ternary Optoelectronic Logic Gates Composed of Nanostructured GaN Photoelectrodes with Bipolar Photoresponse Characteristics

Design of optical reconfigurable balanced ternary arithmetic logic unit using MEMS based design

Trinary registers and counters using savart plate and spatial light modulator for optical computation in multivalued logic

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