Orbital angular momentum (OAM), one fundamental property of light, has been great interest over the past decades. An ideal OAM generator, fully compatible with existing physical dimensions (wavelength and polarization) would offer distinct features broadband, polarization diversity, ultra-compact footprint. Here, we propose, design, fabricate, demonstrate an chip-scale broadband diversity generator on a silicon platform 3.6 × μm2 The chip is formed by introducing subwavelength surface...

We design and fabricate a low-loss silicon photonic two-dimensional grating coupler that serves to couple light between standard single-mode fibers waveguides in the silicon-on-insulator platform split both orthogonal polarization states. The efficiency of fabricated device is enhanced by backside metal mirror reaches record value -1.8 dB with 1 bandwidth 32 nm around 1550 nm. demonstrated coupling 2.2 better than conventional without mirror.

Optical modulators have been and will continue to be essential devices for energy- cost-efficient optical communication networks. Heterogeneous silicon lithium niobate demonstrated promising performances of low loss, drive voltage, large modulation bandwidth. However, DC bias drift is a major drawback using as the active electro-optic material. Here, we demonstrate high-speed bias-drift-free Mach–Zehnder based on heterogeneous platform. The combine stable thermo-optic biases in ultra-fast...

Thin-film lithium niobate is a promising material platform for integrated nonlinear photonics, due to its high refractive index contrast with the excellent optical properties. However, and correspondingly small mode field diameter limit attainable coupling between waveguide fiber. In second harmonic generation processes, lack of efficient fiber-chip schemes covering both fundamental wavelengths has greatly limited overall efficiency. We design fabricate an ultra-broadband tri-layer edge...

We propose and demonstrate an on-chip coupling resonant system to generate electromagnetically induced transparency (EIT)-like effect Fano resonance on silicon platform. It is composed of a microring resonator (MRR) two cascaded Sagnac-loop mirrors (SLMs) assisted Fabry-Perot (FP) cavity silicon-on-insulator. According the conditions MRR, cases are studied theoretically. When MRR over coupling, EIT-like transmission can be observed. In contrast, resonances generated by condition under...

Photonics integration of an optoelectronic oscillator (OEO) on a chip is attractive for fabricating low cost, compact, power consumption, and highly reliable microwave sources, which has been demonstrated recently in silicon insulator (SOI) indium phosphide (InP) platforms at X-band around 8 GHz. Here we demonstrate the first OEOs thin film lithium niobate (TFLN) platform, advantages lower V π , no chirp, wider frequency range, less sensitivity to temperature. We have successfully realized...

Optical modulators were, are, and will continue to be the underpinning devices for optical transceivers at all levels of networks. Recently, heterogeneously integrated silicon lithium niobate (Si/LN) have demonstrated attractive overall performance in terms loss, drive voltage, modulation bandwidth. However, due moderate Pockels coefficient niobate, device length Si/LN modulator is still relatively long low-drive-voltage operation. Here, we report a folded Mach–Zehnder consisting meandering...

Compact and broadband manipulation of spatial modes is important in applications exploiting the space domain light waves. Here, we demonstrate chip-scale generation synthesization ultrabroadband orbital angular momentum (OAM) (twisted light) on a silicon platform. By introducing subwavelength holographic fork grating top waveguide, in-plane guided mode converted to free-space OAM mode. Inputs from both sides waveguide enable modes. We also characterize wavelength-dependent emission...

Orbital angular momentum (OAM) multiplexing has emerged as an important method to increase the communication capacities in future optical information technologies.In this work, we demonstrate a silicon integrated OAM (de)multiplexer with very simple structure.By simply tapping evanescent wave of two different whispering gallery modes rotating inside multimodal micro-ring resonator, four in-plane waveguide are converted free-space vector beams high mode purity.We further chip-to-chip...

We demonstrate a high-performance reconfigurable bandpass filter implemented by cascaded Sagnac loop mirror (SLM)-based coupled resonator optical waveguides (CROWs) on the silicon-on-insulator platform. By dynamic thermal tuning of reflectivity in each SLM, proposed can achieve simultaneous 3 dB bandwidth from 8.50 to 20.25 GHz and central wavelength range 216.25 GHz. A box-like filtering response with an ultra-high extinction ratio up 70 ultra-sharp roll-off 0.61 are observed 6th-order...

Hybrid Lithium Niobate (LN) and Silicon photonic (SiPh) integration platform has emerged as a promising candidate to combine the scalability of silicon photonics with excellent modulation performance LN. Mach-Zehnder modulators (MZMs) based on this exhibit outstanding low insertion loss, drive voltage, large bandwidth. In paper, we discuss technologies for realizing hybrid LN/SiPh platform. The configuration key metrics MZM are analyzed in detail. Furthermore, various functional devices...

A compact, high-efficiency grating coupler is demonstrated for interfacing a silicon waveguide and perfectly-vertical fiber at O-band. The lies on tilted membrane minimizing the reflections. Circular lines are adopted to shorten overall device length about 60μm. 57% peak coupling efficiency >28nm 1-dB bandwidth obtained experimentally. Back reflections of 1% single mode theoretically estimated. processing flow realize proposed structure discussed in detail. fabrication control over angle...

We demonstrate a tunable temporal photonic fractional-order differentiator based on Mach–Zenhder interferometer (MZI) coupled microring. An MZI structure is designed to replace conventional coupling of straight waveguide and ring waveguide. When the refractive index one arm adjusted by thermo-optic effect, coefficient between microring can be changed implemented. In experiment, device presents differentiation order range from 0.25 1.75, which largest tuning using single resonator best our knowledge.

We propose and demonstrate a polarization-insensitive high speed optical switch unit based on silicon lithium niobate hybrid integration platform. The presented device exhibits sub nano-second switching time, low drive voltages of 4.97 V, power dissipation due to electrostatic operation. measured polarization dependence loss was lower than 0.8 dB. demonstrated could provide as building block for high-speed matrix switches.

A simple and ultra-compact integrated optical vortex beam receiver device is presented.The based on the coupling between modes whispering gallery in a micro-ring resonator via embedded angular gratings, which provides selective reception of with definitive total momentum (summation spin orbital momentum) through phase matching condition process.Experimental characterization confirms correct detection carried by beams incident device.In addition, photonic spin-controlled unidirectional...

We demonstrate a microelectromechanical-system-based tunable grating coupler capable of changing the central wavelength. The structure is fabricated on suspended cantilever with supporting arms and can be tuned by an applied voltage. range 22.8 nm under actuation voltages up to 12 V in present devices. In addition, we show that are critical components used effectively avoid pull-in effect.

Thermal tuning acts as one of the most fundamental roles in integrated silicon photonics since it can provide flexibility and reconfigurability. Low power fast speed are long-term pursuing goals terms performance thermal tuning. Here, we propose experimentally demonstrate an efficient scheme employing metallic metal heater. The slow-light effect photonic crystal waveguide is employed to enhance microheater. Meanwhile, microheater on side rather than top. Thanks both side-integrated...

A novel concept to generate a linear chirped microwave signal is proposed and experimentally demonstrated. The frequency time mapping method employed, where the photonic crystal waveguide Mach–Zehnder interferometer structure acts as spectral shaper thanks slow light effect. By optimizing structural parameters of waveguide, with time-bandwidth product about 30 obtained. impact on generated also investigated. utilization effect brings in significant advantages, including ultra-small footprint...

A tunable grating coupler capable of dynamically changing the central wavelength with low power consumption is demonstrated and fabricated using a standard complementary metal-oxide-semiconductor process. The based on an efficient thermal tuning scheme employing free-standing silicon-on-insulator strip waveguides. air gap provides isolation between heated structure underlying silicon substrate, which greatly enhance heating efficiency. We achieve shift 55 nm for 19.5 mW record efficiency...

Photon dimension mapping provides an efficient way to learn from each other's strengths offset their own weaknesses in a variety of applications. By the conventional amplitude modulation spatial mode and employing integrated orbital angular momentum (OAM) multiplexer, we present approach break light speed limit implement high-speed silicon-chip-assisted OAM encoding information transfer. The silicon chip is formed by multi-mode micro-ring resonator with grating embedded inner wall two bus...

Optical vortices carrying orbital angular momentum (OAM) have recently attracted increasing interest for providing an additional degree of freedom capacity scaling in optical communications. The vortex generator is essential component to facilitate OAM-enabled Traditional devices face challenges limited compactness, narrow bandwidth, and first-order OAM modes. Here, using the direct-binary search (DBS) optimization algorithm, we design, fabricate, demonstrate a digitized subwavelength...

We demonstrate an O-band substrate-removed thin-film lithium niobate modulator with a low microwave loss of 0.24 dB cm −1 GHz −1/2 . The device features 1-V half-wave voltage and 1.4 EO response roll-off at 50 GHz.

In this work we demonstrate chip-to-chip orbital angular momentum (OAM) multiplexing transmission using a pair of ultra-compact silicon integrated (de)multiplexer. Four OAM beams were multiplexed and then demultiplexed by the devices.