Polarization-insensitive wavelength filters by birefringence compensation of vertical couplers

Deri, R. J.; Emanuel, M.A.; Patterson, F. G.; Dijaili, S.P.; Nguyen, Long Thang

doi:10.1063/1.116240

Cited by 10 publications

(6 citation statements)

References 8 publications

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“…However, Adachi's model is not very accurate, and several modifications have been proposed recently. 3,[23][24][25][26][27][28]34 Jenkins 24 has obtained better agreement with the experimental data by introducing an exponential decay of matrix elements which are taken to be constant over the Brillouin zone in Adachi's model. Nonetheless, this model gives good agreement with the experi-mental data only in the narrow range, and for AlAs, the calculated values differ from the experimental ones for a constant amount below 3 eV.…”

Section: Introductionmentioning

confidence: 76%

Modeling the optical constants of AlxGa1−xAs alloys

Djurišić

Rakić

Kwok

et al. 1999

Journal of Applied Physics

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The extension of Adachi’s model with a Gaussian-like broadening function, in place of Lorentzian, is used to model the optical dielectric function of the alloy AlxGa1−xAs. Gaussian-like broadening is accomplished by replacing the damping constant in the Lorentzian line shape with a frequency dependent expression. In this way, the comparative simplicity of the analytic formulas of the model is preserved, while the accuracy becomes comparable to that of more intricate models, and/or models with significantly more parameters. The employed model accurately describes the optical dielectric function in the spectral range from 1.5 to 6.0 eV within the entire alloy composition range. The relative rms error obtained for the refractive index is below 2.2% for all compositions.

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Section: Introductionmentioning

confidence: 76%

Modeling the optical constants of AlxGa1−xAs alloys

Djurišić

Rakić

Kwok

et al. 1999

Journal of Applied Physics

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“…[9][10][11][12][13][14][15][16][17][18] Forouhi and Bloomer 19 have proposed a model which is also related to the band structure and requires fewer parameters ͑up to 14͒. However, for the materials investigated here, this model does not bring about significant improvement in accuracy over the conventional Adachi's model, especially around the fundamental band-gap E 0 .…”

Section: Introductionmentioning

confidence: 78%

Modeling the optical constants of GaP, InP, and InAs

Djurišić¹,

Rakić

Kwok³

et al. 1999

Journal of Applied Physics

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An extension of the Adachi model with the adjustable broadening function, instead of the Lorentzian one, is employed to model the optical constants of GaP, InP, and InAs. Adjustable broadening is modeled by replacing the damping constant with the frequency-dependent expression. The improved flexibility of the model enables achieving an excellent agreement with the experimental data. The relative rms errors obtained for the refractive index equal 1.2% for GaP, 1.0% for InP, and 1.6% for InAs.

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“…Asymmetric vertical directional coupler filters [36][37][38][39][40][41][42][43][44][45][46][47] using two dissimilar waveguides on III-V semiconductors are promising because of the precise control of waveguide thickness and indices and monolithic integration with other devices. It is well known that the linewidth of the asymmetric directional coupler is inversely proportional to both the device length and the difference of mode dispersion in the two waveguides.…”

Section: Inp/gaas Fused Filtermentioning

confidence: 99%

3D Photonic Integrated Circuits for WDM Applications

Shakouri¹,

Liu²,

Abraham³

et al. 1998

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The wafer fusion technique for realization of compact waveguide switches, filters and 3D photonic integrated circuits is investigated theoretically and experimentally. Calculations based on the beam propagation method show that very short vertical directional couplers with 40-220 µm coupling lengths and high extinction ratios from 20 to 32 dB can be realized. These extinction ratios can be further improved using a slight asymmetry in waveguide structure. The optical loss at the fused interface was investigated by comparison of the transmission loss in InGaAsP-based ridge-loaded waveguide structures with and without a fused layer near the core region. This reveals an excess loss of 1.1 dB/cm at 1.55 µm wavelength due to the fused interface. Fused straight vertical directional couplers have been fabricated and characterized. Waveguides separated by 0.6 µm gap layer exhibit a coupling length of 62 µm and a switching voltage of about 12 volts. Since GaAs and InP have different material dispersion at 1.55 µm wavelength, a combination of InP and GaAs couplers is used to demonstrate an inherent polarization independent and narrowband filter.

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Polarization-insensitive wavelength filters by birefringence compensation of vertical couplers

Cited by 10 publications

References 8 publications

Modeling the optical constants of AlxGa1−xAs alloys

Modeling the optical constants of AlxGa1−xAs alloys

Modeling the optical constants of GaP, InP, and InAs

3D Photonic Integrated Circuits for WDM Applications

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