Reflective vertical cavity semiconductor saturable absorber for functional operations with thermal limitations and saturable index change

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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“…Considering nonstanding wave, the length-averaged intensity within the VCSSA cavity due to multiple reflection and refraction is given by [19] …”

Section: Nonlinear Fabry-pérot Analysismentioning

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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“…In the first part of this paper we have studied the spectral reflectivity of the device for different input powers of the optical signal. The reflectivity of the device at normal incidence is given by [5,6] ( ) ( )…”

Section: A Power Characterizationmentioning

confidence: 99%

“…P c and P sat , are respectively the cavity and saturation power inside the cavity. The power inside the cavity can be expressed as [6] ( )(…”

Section: A Power Characterizationmentioning

confidence: 99%

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All-optical regeneration of phase modulated signal using a vertical cavity semiconductor saturable absorber

Mishra

Datta

2012

2012 5th International Conference on Computers and Devices for Communication (CODEC)

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The nonlinear phase response of a vertical cavity semiconductor saturable absorber (VCSSA) has been studied theoretically incorporating both the nonlinear change in refractive index and the optically induced temperature rise in the micro-cavity. The simulation result shows that both negative and positive phase-shift can be obtained for different input powers of the signal beam, when the VCSSA is operated in reflection mode. This feature of the device can be utilized for compensating fiber nonlinearity and regeneration of phase-modulated optical signal.

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

Pradhan

Saha

Datta

2013

Optics Communications

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Reflective vertical cavity semiconductor saturable absorber for functional operations with thermal limitations and saturable index change

Cited by 8 publications

References 26 publications

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

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

All-optical regeneration of phase modulated signal using a vertical cavity semiconductor saturable absorber

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

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