Optical modeling of laterally-corrugated ridge-waveguide gratings

Laakso, A.; Dumitrescu, M.; Viheriälä, Jukka; Karinen, Jukka; Suominen, Mikko; Pessa, M.

doi:10.1007/s11082-009-9292-3

Cited by 20 publications

(8 citation statements)

References 18 publications

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“…This is due to the fact that the maximum κ is obtained in practice with γ = ½, and the maximum κ is approximately inversely proportional to m. In DFB structures with surface gratings neither of these characteristics is true (Laakso et al 2008). However, the calculated SMSR doesn't show a significant dependence on m, whereas γ affects only the optimal values of d 1 and d 2 , as illustrated in Fig.…”

Section: The Optimal Single-mode Yieldmentioning

confidence: 99%

The effect of facet reflections in index-coupled distributed feedback lasers with coated facets

et al. 2011

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The effect of facet reflections and different grating parameters on side-mode suppression ratio in index-coupled distributed feedback lasers without a phase-shift section is analyzed. The effect of uncontrollable facet positions on side-mode suppression ratio is studied when the grating coupling coefficient, the grating filling factor, the grating order, the device length and the facet reflectivities are varied. The single-mode device yield and the facet reflectivities needed for achieving a high yield are evaluated, the reflectivity of the anti-reflection coated facet is optimized as a function of the coupling strength and the effect of facet reflections on the other laser characteristics is shown.

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Section: The Optimal Single-mode Yieldmentioning

confidence: 99%

The effect of facet reflections in index-coupled distributed feedback lasers with coated facets

et al. 2011

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“…The coupling coefficient for gratings with rectangular-shaped longitudinal refractive index variation can be written as 13 :…”

Section: Modeling and Simulation Particularities Of The Lc-rwg Gratingsmentioning

confidence: 99%

“…the fraction of the optical field intensity in the grating region) and n 1 and n 2 are the constant refractive index values in the grating regions where the optical field has a significant intensity. For buried-heterostructure gratings the coupling coefficient formula (1) is frequently simplified by using the approximation n 1 +n 2 ≈ 2n eff , which leads to an overestimation of the coupling coefficient for LC-RWG gratings, because for these gratings n 1 +n 2 < 2n eff , as one of the alternating grating materials is a dielectric with much lower refractive index but a small influence on n eff 13 . A better way for calculating the grating coupling coefficient for LC-DFB lasers is by using the definition for the effective refractive index and the better approximation…”

Section: Modeling and Simulation Particularities Of The Lc-rwg Gratingsmentioning

confidence: 99%

Development of high-speed directly modulated DFB and DBR lasers with surface gratings

Dumitrescu

Telkkala

Karinen

et al. 2011

Novel in-Plane Semiconductor Lasers X

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The conventional distributed feedback and distributed Bragg reflector edge-emitting lasers employ buried gratings, which require two or more epitaxial growth steps. By using lateral corrugations of the ridge-waveguide as surface gratings the epitaxial overgrowth is avoided, reducing the fabrication complexity, increasing the yield and reducing the fabrication cost. The surface gratings are applicable to different materials, including Al-containing ones and can be easily integrated in complex device structures and photonic circuits. Single-contact and multiple contact edge-emitting lasers with laterally-corrugated ridge waveguide gratings have been developed both on GaAs and InP substrates with the aim to exploit the photon-photon resonance in order to extend their direct modulation bandwidth. The paper reports on the characteristics of such surface-grating-based lasers emitting both at 1.3 and 1.55 µm and presents the photon-photon resonance extended small-signal modulation bandwidth (> 20 GHz) achieved with a 1.6 mm long single-contact device under direct modulation. Similarly structured devices, with shorter cavity lengths are expected to exceed 40 GHz smallsignal modulation bandwidth under direct modulation.

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“…If the transverse refractive index distributions in the grating areas are constant, the coupling coefficient for rectangularshaped gratings can be written as: 19 = 2n ef f · ͑n 2 2 − n 1 2 ͒ ͐͐ Grating ⌿ 2 ͑x,y͒dxdy I, ⌿͑x , y͒ is the transverse 2D distribution of the dominant electromagnetic field component, and ⌬͑x , y , z͒ is the dielectric perturbation resulting from the periodic grating.…”

Section: Designmentioning

confidence: 99%

Design and operation of distributed feedback transistor lasers

Dixon

Feng

Holonyak

2010

Journal of Applied Physics

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Single-mode, single-lobe operation of surface-emitting, second-order distributed feedback lasers Appl. Phys. Lett. 75, 885 (1999); 10.1063/1.124544Low-threshold high-quantum-efficiency laterally gain-coupled InGaAs/AlGaAs distributed feedback lasersThe design and fabrication methods utilizing soft photocurable nanoimprint lithography to realize single longitudinal mode distributed feedback transistor lasers are investigated. Coupled-mode theory and the effective index method are used to determine accurately the periodic dimensions necessary to integrate a surface grating in the top emitter AlGaAs confining layers of an InGaP/ GaAs/InGaAs heterojunction bipolar transistor laser. Electrical and optical device data confirm the design methods. The distributed feedback device produces continuous wave laser operation with a peak wavelength = 959.75 nm and threshold current I B = 13 mA operating at −70°C. For devices with cleaved ends a side mode suppression ratio Ͼ25 dB has been achieved.

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Optical modeling of laterally-corrugated ridge-waveguide gratings

Cited by 20 publications

References 18 publications

The effect of facet reflections in index-coupled distributed feedback lasers with coated facets

The effect of facet reflections in index-coupled distributed feedback lasers with coated facets

Development of high-speed directly modulated DFB and DBR lasers with surface gratings

Design and operation of distributed feedback transistor lasers

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