Experiment with multiple-quantum-well waveguide switching element

Čada, Michael; Keyworth, B.P.; Glinski, J.; SpringThorpe, A. J.; Mandeville, P.

doi:10.1364/josab.5.000462

Cited by 36 publications

(5 citation statements)

References 6 publications

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“…Analytical solutions were first reported for Αβ = 0 by Maier and Jensen [58,59], and generalized later to Αβ Φ 0 by Wabnitz and Trillo [60], and by Maier and Sitarski [61]. Switching in nonlinear directional couplers (and their analogs) has been demonstrated in glass fibers [62][63][64], and in organic [28] and semiconductor [23][24][25][26][27]29] integrated optics waveguides. 9a.…”

Section: Nonlinear Directional Couplermentioning

confidence: 99%

“…The most desirable case for an all-optical switch is for Αβ = 0, as sketched in Fig. In the other cases, deleterious effects such as two-photon absorption [27], slowly relaxing nonlinearities [23,25,26], large linear losses [23][24][25][26][27]29], and saturation in the ail-optically induced index change [24] have spoiled the response. Switching in nonlinear directional couplers (and their analogs) has been demonstrated in glass fibers [62][63][64], and in organic [28] and semiconductor [23][24][25][26][27]29] integrated optics waveguides.…”

Section: Nonlinear Directional Couplermentioning

confidence: 99%

See 1 more Smart Citation

Nonlinear Guided Wave Optics

Stegeman

1992

Contemporary Nonlinear Optics

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Section: Nonlinear Directional Couplermentioning

confidence: 99%

Section: Nonlinear Directional Couplermentioning

confidence: 99%

Nonlinear Guided Wave Optics

Stegeman

1992

Contemporary Nonlinear Optics

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“…Unfortunately, this device places very stringent requirements on material properties [9,40], and there are only a few experimental reports [38,[41][42][43][44][45] . Most of these demonstrations of NLDC operation have been performed in the near infrared with GaAs-AlGaAs multiple quantum well (MQW) structures [40][41][42][43][44], where the observed nonlinear effects are probably electronic in nature and due to an excitonic resonance in the MQW . Response times of less than 10 ps with recovery times of 4 ns (diffusion limited) and nonlinear coefficients of the order of 10 -5 cm 2 W -' have been measured both in planar [42,44] and strip-loaded guides [43] .…”

Section: 3 Nonlinear Coherent Directional Couplersmentioning

confidence: 99%

“…excitonic and band-filling) suffer from large absorption and thermal problems, and require involved fabrication technologies . Bistability and switching have been demonstrated in bulk devices, and a few results are available in guided-wave formats [14,16,[41][42][43][44][47][48][72][73][74] . Recently, nonlinear transmission measurements have been reported near 1 .…”

Section: Materials Issuesmentioning

confidence: 99%

All-optical Integrated Nonlinear Devices

Assanto

1990

Journal of Modern Optics

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“…Since the guiding conditions are such that a near cutoff mode has long evanescent fields in the doped substrate, and also couples to radiative modes, the overall propagation losses, as seen by a large imaginary effective propagation index, are so drastic as to eliminate propagation in only a few hundred micrometres in our geometry. There are several a4vantages worth noting for the use of silicon as an optical modulator in this particular geometry when compared with existing all-optical (6) or electro-optical(7) devices. Silicon is quite transparent in the region of 1.2-2.0 pm, these are the wavelengths presently in use for long distance fiber optics communication links (3).…”

Section: Introductionmentioning

confidence: 99%

All-optical, silicon based, fiber optic modulator using a near cutoff region

Normandin¹,

Houghton²,

Simard‐Normandin³

1989

Can. J. Phys.

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We demonstrate, using molecular beam epitaxy and chemical vapour deposition grown silicon thin films, an all-optical modulator for single-mode guided light at 1.32 pm. A control beam of above band-gap light is used to generate electron-hole pairs via inter-band absorption and the resultant lowering of the effective refractive index brings the waveguide to cutoff thus limiting throughput. Near 100% modulation is obtained with less than 150 pJ energies with subnanosecond initiation and recovery times. The operation is stable and is polarization and wavelength independent in a three port geometry suitable for use as a logic gate. To reduce the total energy required to bring the waveguide to cutoff, the effects of using a small, already near cutoff and leaky region at the interaction region is investigated here. Preliminary measurements on a graded index, leaky mode, chemical vapour deposition sample resulted in a reduction by a factor of five or better in drive energy. By keeping the leaky region short, the losses can be kept to negligible values. Results in time resolved imaging of the guided mode are also presented along with the necessary design considerations for performance compatible with presently available communication solid state laser sources.Nous decrivons un modulateur entibrement optique pour la lumibre guidCe ? i un seul mode i 1,32 pm utilisant des couches minces de silice obtenues par Cpitaxie de faisceau molCculaire et deposition chimique de vapeurs. Un faisceau lumineux de contrble, d'Cnergie supCrieure a la largeur de la bande interdite, est utilisC pour gCnCrer des paires Clectron-trou par absorption inter-bandes; la diminution de I'indice de rifraction effectif qui en rCsulte provoque la coupure de la transmission dans le guide d'onde. On a obtenu une modulation de prbs de 100% avec des energies inferieures i 150 pJ et des temps de montCe ou de descente sous la nanoseconde. Le fonctionnement est stable, indkpendant de la polarisation et de la longueur d'onde, dans une gComCtrie ti trois entrees convenant ii I'utilisation du dispositif comme porte logique. Dans le but de rCduire l'energie totale requise pour provoquer la coupure dans le guide d'onde, nous Ctudions les effets de l'utilisation, i la rCgion d'interaction, d'une faible rCgion deji prks de la coupure et avec pertes. Des mesures prkliminaires sur un Cchantillon, fabriquC par dCpbt chimique de vapeur, ti indice gradue, en mode avec perte, ont montrk une reduction de I'Cnergie requise par un facteur Cgal ou supCrieur i cinq. En gardant courte la region en question, les pertes peuvent Ctre maintenues ? i des valeurs nigligeables.On prksente aussi des resultats sur la representation du mode guide avec resolution temporelle, en mCme temps que les considCrations de design nCcessaires pour assurer une performance compatible avec les sources laser i Ctat solide disponibles pour les communications.[Traduit par la revue]Can.

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Experiment with multiple-quantum-well waveguide switching element

Cited by 36 publications

References 6 publications

Nonlinear Guided Wave Optics

Nonlinear Guided Wave Optics

All-optical Integrated Nonlinear Devices

All-optical, silicon based, fiber optic modulator using a near cutoff region

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