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We have designed, fabricated and tested edge couplers for silicon photonics targeting industry-standard SMF-28 fibers. These edge couplers are based on a SiN inverse taper fabricated on a silicon-on-insulator (SOI) platform combined with an etch-based substrate removal process that prevents leakage of the expanded mode to the underlying silicon substrate. The measured couplers exhibited a 0.5 dB bandwidth...
A fully suspended mid-infrared racetrack resonator is experimentally demonstrated. It has good mechanical stability and broad spectral range of transparency. The measured loaded optical Q factor is 16,440 at 2402.38 nm, with an extinction ratio of 11.83 dB.
We developed a high speed and high efficiency of depletion type Si optical modulator (Si-MOD) with a pn junction by applying a p-type-doped strained SiGe layer which was stacked on the lateral pn junction type Si-MOD. We designed the optimum Si-MOD structure and demonstrated a high modulation efficiency of 1.0 Vcm, which is about 50% more efficient than that of Si-MOD with a lateral pn junction. We...
We compare the performances of different spot size converter (SSC) designs consisting of backend waveguide arrays (“dot-like”, “cross-like”, “stripes”, “box”) at the facet, adiabatically coupled to tapered Si waveguides. For the study, we use SiON waveguides and a low index step “box” waveguide.
Because of graphene's large nonlinear refractive index, a nonlinear model is established to characterized the nonlinear parameters. With graphene, the nonlinear parameters of the hybrid graphene-silicon waveguides increase tens of times. Figure of merits of such waveguides indicate that graphene could be used to enhance the nonlinear performances of silicon waveguides.
We demonstrate a silicon PAM-4 optical modulator, which is based on a symmetric Mach-Zehnder interferometer. Two uncorrelated binary electrical signals with different peak-to-peak voltages are applied to the phase shifters of the silicon optical modulator. Accordingly, two different phase shifts are generated in the two arms. After the permutation, there are totally four phase differences between...
This work addresses analysis of hybrid plasmonic/dielectric metamaterials operated in guided wave configurations in the near-infrared domain (» = 1.5 µm). The objective is to achieve an efficient control over the flow of the light in the waveguide using effective index variation induced by metasurface resonances. Specifically we consider a composite guiding structure made of a 2D plasmonic metasurface...
Optical modulation in the O-Band using a Mach-Zehnder modulator in push-pull configuration is presented and experimentally demonstrated. Open eye diagrams at 25 GBps have been obtained with more than 8 dB extinction ratio with an active length of only 1 mm.
Realizing CMOS-compatible integrated lasers on silicon is a crucial step towards cost-efficient, high-functional optoelectronic integrated circuits (OEICs). Here, we report on a concept to embed active optical devices based on a bonded III–V epitaxial layer stack between the FEOL and BEOL of a CMOS silicon photonics chip. Ultra-shallow laser devices are realized with this concept and optically-pumped...
We propose an ultra-compact solid-state auto-correlator fabricated by Si photonics technology. The correlation waveform is obtained by detecting the overlap of two slow-light pulses counter-propagating in a photonic crystal waveguide integrated with two-photon absorption photodiode array. Since the device does not need a mechanical delay scanner, the full integration on a silicon-on-insulator, easy...
We study ultrafast spectral characteristics of our ultra-short ultra-slicon rich nitride (USRN) waveguide with large Kerr nonlinearity (γ∼550W−1/m) and negligible nonlinear loss. The output spectra of USRN ring resonator and short-length waveguide broaden around 2 times and 4 times wider than that in 500 fs input pulses, respectively. Negligible nonlinear loss including two-photon absorption at near-infrared...
In this paper, we propose the mirror-symmetric Fano-like resonances which are generated by the interference between two resonant beam from through and drop ports of an add-drop microring resonator. While the path lengths of the two beams are different, small quasi-periodic spectral responses are nested in large periodic ones. The line shapes of the resonances are mirror images about the center wavelength...
Noble metal nanostructures are widely used in modern thermal applications due to their remarkable ability to effectively convert visible light or near-IR incident radiation into heat energy. However, the applicability of such plasmonic nanoobjects are limited by the absence of thermally dependent optical signals, that could provide direct single-step thermometry. Recently, novel optical heating concept...
In this paper, we propose a novel way for 3D packaging of optical and electrical dies for parallel optical interconnections based on wet etched silicon interposer. The process flow of silicon interposer fabrication is demonstrated. Through three steps of deeply wet etching of silicon, a multi-level cavity is formed for embedding and flip-chipping of optical die and electrical die, and the optical...
A demonstration of a wavelength monitor using two unbalanced silicon based Mach-Zehnder interferometers is discussed. Its working principle is explained and a simulation of its operation is presented where a small modification of a MZI arm waveguide width yield an “X-type” spectral response suitable for ratiometric power measurement. Finally, experimental results show a functional range of 2.2 nm...
Silicon interposer based 2.5D IC can realize heterogeneous integration and is effective to implement an electro-optical system. In this paper, we analyze the CPW structure transmission line on silicon interposer for high speed electro-optical system. The RDL-TSV-RDL transmission structure is used to reduce the resonance. An optimization method is proposed to improve the performance of the RDL-TSV-RDL...
We review recent advances in heterogeneous silicon photonic integration technology and components and describe progress in silicon photonic integrated circuits. Techniques for laser integration and the impact of active silicon photonic integrated circuits could have on interconnects, telecommunications and silicon electronics are reviewed. A variety of materials are being heterogeneously integrated,...
We examine the optical wave propagation in a single-mode silicon wire waveguide which is coupled by the evanescent field with the multiple periodic strips (segmented waveguide) separated from it by a silica buffer. The numerical modeling by the method of lines (MoL) and by finite different time domain (FDTD) method proves that the weak reflectors with period 1.6 µm may produce a strong of the transmitting...
For the first time, an ultra-compact integrated isolator without use of permanent magnets is designed and fabricated by bonding Ce:YIG on a silicon microring. Record isolation of 32dB and low 2.3dB excess loss were achieved.
Current densities of 1.5ASD and additive concentrations of 15ml/L were used to electroplate the copper into TSV to fabricate the test samples. The samples were annealed at 425°C for 30 minutes in a vacuum furnace with the heating rate of 10°C /min. The annealed samples were thermal cycled with temperature range (25∼325°C), heating & cooling rate (10 °C/min), dwell time of 2 min at the peak and...
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