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We present a platform for the feedback control of a multichannel transmitter based on DML sources and a silicon photonic multiplexer and carver circuit. Automatic tuning and wavelength locking are demonstrated in about 150 ms.
We have demonstrated a polarization-diversity silicon microring resonator with a low PDL of <1 dB, which is successfully used for polarization independent ADD/DROP of a 10 Gbit/s channel in a 10 λ × 10 Gbit/s WDM signal.
We demonstrate a novel hybrid microring resonator with an integrated III-V-on-Si metal-oxide-semiconductor (MOS) capacitor structure for essentially zero-power resonance tuning. Over 1,000,000,000 times better tuning efficiency than conventional thermal tuning approach has been achieved.
We report our recent progress in characterizing sub-bandgap surface-state absorption (SSA) and defect-state absorption (DSA) in foundry-fabricated silicon waveguides and microring resonators in 1310–1550nm wavelengths. While SSA is widely regarded as a fundamental linear absorption loss due to surfaces and interfaces for silicon waveguides and microring resonators, our previous work has shown that...
Silicon photonics offers a promising integration platform facilitating chip-scale optical signal processing. We review recent research progress in integrated optical signal processing with silicon platform by employing advanced multi-level modulation formats. Using fabricated silicon waveguides, gratings, couplers, microring resonators, vertical slot waveguides and hybrid plasmonic waveguides, we...
Optical arbitrary waveform generation (OAWG) plays a critical role in many applications, such as generating optical ultra-wide band (UWB) signal, optical pulse radar, all-optical temporal differentiator, and test of optical communication system. Although lots of OAWG schemes were reported using mature fiber grating techniques, one of the most promising solutions is prone to be the miniaturization...
Optical frequency conversion is an essential building block of nanophotonics, whose application ranges from tunable light sources for classical on-chip communications to miniaturized telecommunications-band interfaces for quantum information science [1]. In the widely-used silicon photonics platform (including silicon nitride and silicon dioxide), a majority of reported frequency conversion experiments...
Silicon-based optical micro-ring resonators (MRRs) are very popular for many application because of the ultra-compact footprint and easy fabrication. The wavelength-selectivity property of MRRs makes it possible to be used not only as an optical filter with a narrow bandwidth but also as an optical sensor with high sensitivity. This paper gives a review of our recent work on the MRRs on silicon. First,...
The high power consumption and limited bandwidth of conventional metal interconnects has become the main obstacle to the extension of Moore's Law. Optics is the perfect solution because of its broad bandwidth, low latency, low power consumption, and low crosstalk. The hybrid III–V-on-Si platform has been developed extensively recently as a promising integrated platform to build robust Si-based light...
A novel single-polarization microring resonator is proposed and demonstrated to enable the wavelength-selectivity for only one polarization (e.g., TM polarization), which is useful for a polarization-/wavelength-division hybrid multiplexing system.
We describe a technique for realizing high-efficiency dielectric resonator antennas composed of intrinsic silicon in the terahertz range. These dielectric resonator antennas are deployed in both uniform and nonuniform array configurations, for the manipulation of terahertz radiation. The uniform array configuration is analyzed in terms of quality factor, and is subsequently employed as a highly efficient...
Optical methods are challenging to apply at the nanoscale, due to the large mismatch between the wavelength and the sizes of nanoscale objects. I will describe projects that have addressed this challenge for various applications.
The integration of a photonic information processing system onto a single chip requires great research effort toward engineering metamaterials for miniaturization of the optical devices and circuits. We discuss nanoscale engineered optical nonlinearities for modulation and wave mixing of optical fields, and metal-dielectric-semiconductor nanostructures and compositions to construct nanoemitters for...
In this paper, we report on time resolved electro-optic measurements in strained silicon resonators. Strain is induced by applying a mechanical deformation to the device. It is demonstrated that the linear electro-optic effect vanishes when the applied voltage modulation varies much faster than the free carrier lifetime, and that this occurs independently on the level of the applied stress. This demonstrates...
In this communication, we present strategies to implement novel or enhanced optoelectronic functionalities on silicon via the monolithic integration of functional oxides as active layers for nanophotonic devices. We focus on the use of ferroelectric oxides with naturally strong electro-optical coefficients such as BaTiO3 (BTO) on SOI for the realization of electro-optical modulators around 1.55 µm...
We report the passive as well as active modulation of the sensitive Fano resonances in terahertz asymmetric metamaterial structures. The strength of the Fano resonances can be completely switched off passively by changing the asymmetry of the structures and also actively by shininh the sample with very low pump powers. These devices can be used as ultrasensitive sensors, low threshold modulators and...
We report here the hybrid Si/GaN microring resonator structure integrated with Si electrodes. Preliminary results on electro-optic tuning of the guided-mode resonance was in the range of 22 pm for the entire applied voltage range of −60 V to 80 V. Up to 9 dB change in the transmission was observed at the maximum applied voltage. The device might be useful for static wavelength-selectable notch filtering...
In this paper, we propose a novel method to experimentally determine the linear absorption coefficient (LAC) of graphene-silicon hybrid waveguides (GSHWs) by a symmetrical add-drop silicon microring resonator. Experimental results show that the LAC of a GSHW has an average value of 0.23 dB/µm. Our approach does not depend on the fiber coupling, waveguide end facets etc. and thus, is promising for...
We experimentally demonstrate topologically protected optical waveguiding in silicon at the interface between two topologically distinct dimer chains. Further, we propose and demonstrate beating between topological and trivial defect modes.
Analyzing the modal content of resonant nanostructures using optical methods often becomes a sophisticated problem because of hidden dark resonances, which are uncoupled with far-field modes. The common methods of dark modes spectroscopy base on electron beam systems, such as cathodo-luminescence and, thus, are not very convenient in use. We suggest utilizing Raman spectroscopy to reveal the full...
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