Ultra Compact, High Contrast Ratio Based all Optical OR Gate Using Two Dimensional Photonic Crystals

Prabha, K. Rama; Robinson, S.

doi:10.1007/s12633-020-00811-9

Cited by 18 publications

(3 citation statements)

References 39 publications

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“…Moreover, photonic integrated circuits (PICs) assure low crosstalk, high bandwidth and less delay as demanded by all the applications. For PIC applications, various gates were designed [6][7][8][9][10][11][12][13][14][15][16][17][18] using different techniques, since no optimized design is made to operate at a high contrast ratio with ultra-compact structure. The exponentially growing demand is fulfilled by optical components realized using PhCs [19].…”

Section: Introductionmentioning

confidence: 99%

“…Nefedov et al demonstrated elementary Boolean algebra logic operations using optical logic gates [36]. By using a Mach-Zehnder Interferometer an OR logic gate is also reported which offers a 7.27 dB contrast ratio and bit rate of 0.8 Tbps [18]. Implementations of logic gates based on PhCs are remarkable and have been extended spectacularly to design other computational logic circuits.…”

Section: Introductionmentioning

confidence: 99%

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Ultra-compact all-optical logical circuits for photonic integrated circuits

Sridarshini¹,

Geerthana²,

Balaji³

et al. 2023

Laser Phys.

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In this paper, a photonic crystal based ultra-compact Optical XOR gate followed by an optical half-subtractor is proposed. Plane wave expansion is used to evaluate the photonic bandgap of the devised structure. The output and efficiency of logical circuits can be improved by maintaining distinct thresholds for the output logic states, thereby enabling the design to operate even in low power inputs. Reliability of the structure is enhanced by retaining a threshold for the output value. The performance of the proposed circuit is examined using the Finite Difference Time Domain method. The output is considered as logic 1 when the power level exceeds 0.7 μW and logic ‘0’ if it is below 0.35 μW. The proposed logical circuit has high contrast ratio. The XOR gate has a contrast ratio of about 12.55 dB, and the half subtractor has 7.78 dB and 11.76 dB for Difference and Borrow respectively. These devices work at 1550 nm wavelength and are ultra-compact in size. The proposed structure of logic gates will be suitable for photonic integrated circuits due to its ultra-small and simple design.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Ultra-compact all-optical logical circuits for photonic integrated circuits

Sridarshini¹,

Geerthana²,

Balaji³

et al. 2023

Laser Phys.

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“…[2]. Mainly the optical devices are designed by 2DPC, such as, Encoders, Decoders [3], Adders [4], Multiplexers and Demultiplexer [5], Isolators [6], Filters [7], Power splitter [8], Directional coupler, Circulator, logic gates [9,10], Sensors [11,12], Analog to digital converters [13], Comparator and so on.…”

Section: Introductionmentioning

confidence: 99%

Investigation on ultra-compact, high contrast ratio 2D-photonic crystal based all optical 4 × 2 encoder

Arunkumar¹,

Kavitha²,

Prabha³

et al. 2022

Opt Quant Electron

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Optical encoder is playing an essential starring role in optical communication and computing applications. This paper presents a new structure for 4 x 2 optical encoder based on Two Dimensional Photonic Crystals (2DPC). The proposed structure consists of silicon rods in background of air using hexagonal lattice. The proposed structure is composed of four input waveguides and two outputs. The band structure is examined by Plane Wave Expansion (PWE) method and the performance parameters of the 4x2 encoder, namely, normalized output power, footprint, contrast ratio, response time and bit rate are analyzed using Finite Difference Time Domain (FDTD) method. The proposed encoder is operated at 1550nm. The low response time, and small footprint have shown that the encoder is exceptionally suitable for high performance optical networks and photonic computational integrated devices.

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