Large Dispersion of Silicon Directional Couplers Obtained via Wideband Microring Parametric Characterization

Wideband silicon-photonic thermo-optic switch in a wavelength-division multiplexed ring network

“…There was no observable difference in our estimate of a (heating induced loss), or of the wavelength variations of the phase-slip parameters (from 0 or π, respectively, when voltages of 0 and V π volts were applied). Similar to previous investigations of coupler loss [7], under the assumptions of increased coupler loss, there were corresponding small reductions in the estimated |κ| 2 values, preserving the wavelength trends observed in Fig. 3.…”

“…However, this resonant structure may be subject to crosstalk between the optical channels, and the alignment of the resonances to the ITU-T wavelength grid may depend on temperature. Also, the coupling coefficient of a compact directional coupler, as typically used between a microring and a waveguide, tends to vary widely with wavelength [7], and longer (adiabatic) couplers which overcome this limitation may not allow the microring resonator to achieve the requisite free-spectral range.…”

Broadband Silicon-On-Insulator directional couplers using a combination of straight and curved waveguide sections

“…However, it is pertinent to determine which cross-section would give the better wavelength insensitive response overall. Using coupled-mode theory, it was shown that smaller coupler dispersion can be achieved by having a short coupler (i.e stronger waveguide coupling) and reducing the group index difference Δ n g of the coupler supermodes 27 . For example, we have found that in the SOI platform, rib waveguide couplers have a smaller group index difference compared to channel waveguide couplers.…”

Trace gas absorption spectroscopy using functionalized microring resonators

“…It should be noted that since a and (1 − κ) are mathematically identical in Eq. (1), the fitting process yields two solutions for each of these parameters, only one of which is physically reasonable [10]. The resulting wavelength dependence of these parameters is shown in…”