Dispersive bi-stability in a vertical microcavity-based saturable absorber due to photo–thermal effect and initial phase-detuning

Pradhan, R.; Saha, Swatilekha; Datta, Prasanta Kumar

doi:10.1016/j.optcom.2012.08.102

Cited by 7 publications

(2 citation statements)

References 47 publications

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“…Very recently, clockwise OB in reflection mode and counterclockwise OB in transmission mode have been presented numerically in a VCSSA due to photo-thermal effects and initial phase-detuning [8]. The operations of the VCSSA device are fully passive (no bias voltage, no Peltier cooler).…”

Section: Introductionmentioning

confidence: 99%

All-optical XNOR/NOT logic gates and LATCH based on a reflective vertical cavity semiconductor saturable absorber

Pradhan

2014

Appl. Opt.

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This work proposes a scheme of all-optical XNOR/NOT logic gates based on a reflective vertical cavity semiconductor (quantum wells, QWs) saturable absorber (VCSSA). In a semiconductor Fabry-Perot cavity operated with a low-intensity resonance wavelength, both intensity-dependent saturating phase-shift and thermal phase-shift occur, which are considered in the proposed logic operations. The VCSSA-based logics are possible using the saturable behavior of reflectivity under the typical operating conditions. The low-intensity saturable reflectivity is reported for all-optical logic operations where all possible nonlinear phase-shifts are ignored. Here, saturable absorption (SA) and the nonlinear phase-shift-based all-optical XNOR/NOT gates and one-bit memory or LATCH are proposed under new operating conditions. All operations are demonstrated for a VCSSA based on InGaAs/InP QWs. These types of SA-based logic devices can be comfortably used for a signal bit rate of about 10 GHz corresponding to the carrier recovery time of the semiconductor material.

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Section: Introductionmentioning

confidence: 99%

All-optical XNOR/NOT logic gates and LATCH based on a reflective vertical cavity semiconductor saturable absorber

Pradhan

2014

Appl. Opt.

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“…The VCSSA shows clockwise OB due to optical feedback through nonlinear absorption in reflection mode [12] and counterclockwise OB in transmission mode due to saturation of the nonlinear index [13]. Very recently, both clockwise OB in reflection mode and counterclockwise OB in transmission mode have been presented numerically in a VCSSA due to photothermal effects and initial phase-detuning [14]. In [11] and [12] the VCSSA model considered neglects nonlinear phase-shifts, whereas our model can predict the effect of these nonlinear phenomena.…”

Section: Introductionmentioning

confidence: 99%

All-Optical 2R Regeneration With Contrast Enhancement in a Reflective Vertical Cavity Quantum-Wells Saturable Absorber

Pradhan

Mishra

Hussain

et al. 2013

J. Opt. Commun. Netw.

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Round-trip nonlinear phase-shift of an input signal due to optically induced thermal effects and saturable index change in a low intensity resonant reflective vertical cavity semiconductor (quantum wells) saturable absorber (VCSSA) is investigated theoretically for 2R (reamplification and re-shaping) regeneration. Calculations are carried out for a high contrast switching system to find the optimum value of parameters such as energy time filling factor (FF) of the input pump signal, top mirror reflectivity (R t ) of the Fabry-Pérot cavity and wavelength detuning from the low intensity resonant wavelength of the Fabry-Pérot cavity. It is observed that the optimum contrasts are almost the same for a wavelength tuning range as large as 8 nm around the low intensity resonance wavelength of the InGaAs/InP quantum-wells-based VCSSA with R t of 0.72 and FF of 0.10. The simulation shows that the required average input power is minimal for high contrast 2R regeneration when operated in the short wavelength side.

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Phase-Bistability and phase-locking patterns with cavity soliton in Vertical-cavity-based fast semiconductor saturable absorber

Pradhan

Choudhary

Samanta

et al. 2020

Optik

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Dispersive bi-stability in a vertical microcavity-based saturable absorber due to photo–thermal effect and initial phase-detuning

Cited by 7 publications

References 47 publications

All-optical XNOR/NOT logic gates and LATCH based on a reflective vertical cavity semiconductor saturable absorber

All-optical XNOR/NOT logic gates and LATCH based on a reflective vertical cavity semiconductor saturable absorber

All-Optical 2R Regeneration With Contrast Enhancement in a Reflective Vertical Cavity Quantum-Wells Saturable Absorber

Phase-Bistability and phase-locking patterns with cavity soliton in Vertical-cavity-based fast semiconductor saturable absorber

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