Broadband wavelength conversion in a silicon vertical-dual-slot waveguide

Abstract

Abstract:We propose a silicon waveguide structure employing silica-filled vertical-dual slots for broadband wavelength conversion, which can be fabricated using simple silicon-on-insulator technology. We demonstrate group-velocity dispersion tailoring by varying the width of the core, the slots and the side strips, and put forward a method to achieve spectrally-flattened near-zero anomalous group-velocity dispersion at telecom wavelengths. A proposed structure provides a group-velocity dispersion parameter β 2 of −60 ps 2 /km with an effective mode area A eff of 0.075 µm 2 at 1550 nm. This structure is predicted to significantly broaden the bandwidth of wavelength conversion via four-wave mixing, which is validated with experimentally measured 3 dB bandwidth of 76 nm.

Theoretical Investigation of Broadband Frequency Conversion Bridging the Mid-Infrared and Telecom Band Through a Chalcogenide/Sio2 Hybrid Waveguide

“…where β 2 and β 4 are second-and fourth-order dispersion parameters at pump wavelength, respectively, and Ω is the angular frequency separation between pump and signal. Operating in the undepleted pump regime [38], the FWM conversion efficiency can be calculated by γ 2 P p 2 L eff 2 η, where L eff = �1-e -αL �/α is the effective length of the waveguide (α: the loss per unit length and 3 dB/cm [6] is used in this calculation, L: the waveguide length). The phase matching factor η can be expressed as:…”

“…Nevertheless, the detectivity is still challenged by low resolution and signal-to-noise ratio of available MIR detectors. Furthermore, MIR spectral systems generally require a low-temperature environment or multi-stage thermoelectric cooling system to suppress dark current noise, which severely impairs their versatility [5], [6].…”

“…The frequency conversion scheme based on four-wave mixing process (FWM) has been successfully demonstrated in fibers or on-chip waveguide systems in a wide variety of platforms [6]- [13]. Especially, chip-scale waveguide devices have advantages of small size, low cost, and low power consumption.…”

Compact low-birefringence polarization beam splitter using vertical-dual-slot waveguides in silicon carbide integrated platforms

“…In this work, we design a novel vertical-dual-slot waveguide coupler based PBS for low-birefringence waveguides. Vertical-dual-slot waveguides have been used for group-velocity dispersion tailoring and efficient electro-optic modulation by enhancing the optical and electric field overlap [26,27]. Here, we use this structure to adjust the mode distribution for polarization splitting.…”

Intermodal four-wave mixing in silicon waveguides

“…On the contrary, intermodal FWM, i.e., with the signal, the idler, and the pump on different modes, has never been studied in a waveguide. Intermodal FWM has the advantage of not requiring anomalous group velocity dispersion (GVD), which is usually considered for intramodal FWM to achieve phase matching [10,11]. This results in an easier handling of the phase-matching condition [12].…”