Phase modulation ≈ Phase modulation
View article
Dielectric Metasurfaces for Complete and Independent Control of Optical\n Amplitude and Phase Open
Metasurfaces are optically thin metamaterials that promise complete control\nof the wavefront of light but are primarily used to control only the phase of\nlight. Here, we present an approach, simple in concept and in practice, that\nuses …
View article
Coherent Φ-OTDR based on I/Q demodulation and homodyne detection Open
We demonstrate a novel distributed acoustic sensing (DAS) system based on phase-sensitive optical time-domain reflectometry (Φ-OTDR). Both the phase and the amplitude of the Rayleigh scattering (RS) light can be demodulated in real-time. T…
View article
Bonded thin film lithium niobate modulator on a silicon photonics platform exceeding 100 GHz 3-dB electrical modulation bandwidth Open
We demonstrate an ultra-high-bandwidth Mach-Zehnder electro-optic modulator (EOM), based on foundry-fabricated silicon (Si) photonics, made using conventional lithography and wafer-scale fabrication, oxide-bonded at 200C to a lithium nioba…
View article
Experimental study of PAM-4, CAP-16, and DMT for 100 Gb/s Short Reach Optical Transmission Systems Open
Advanced modulation formats combined with digital signal processing and direct detection is a promising way to realize high capacity, low cost and power efficient short reach optical transmission system. In this paper, we present a detaile…
View article
Experimental Demonstration of >230° Phase Modulation in Gate-Tunable Graphene–Gold Reconfigurable Mid-Infrared Metasurfaces Open
Metasurfaces offer significant potential to control far-field light propagation through the engineering of the amplitude, polarization, and phase at an interface. We report here the phase modulation of an electronically reconfigurable meta…
View article
Tailor the Functionalities of Metasurfaces Based on a Complete Phase Diagram Open
Metasurfaces in a metal-insulator-metal configuration have been widely used in photonics, with applications ranging from perfect absorption to phase modulation, but why and when such structures can realize what functionalities are not yet …
View article
A 128 Gb/s PAM4 Silicon Microring Modulator With Integrated Thermo-Optic Resonance Tuning Open
We report the first demonstration of a silicon photonic microring modulator with modulation data rate up to 128 Gb/s (64 Gbaud PAM4). The microring modulator exhibits an electro-optic phase efficiency of V π · L = 0.52 V·cm, an electro-opt…
View article
Pure-quartic solitons Open
Temporal optical solitons have been the subject of intense research due to their intriguing physics and applications in ultrafast optics and supercontinuum generation. Conventional bright optical solitons result from the interaction of ano…
View article
Sine-modulated wavelength-independent full-range complex spectral optical coherence tomography with an ultra-broadband light source Open
We present a full-range complex spectral domain optical coherence tomography with an ultra-broadband light source based on sinusoidal modulation. For the sinusoidal modulation strategy, a lead zirconate titanate stack actuator is employed …
View article
GST-on-silicon hybrid nanophotonic integrated circuits: a non-volatile quasi-continuously reprogrammable platform Open
Reconfiguration of silicon photonic integrated circuits relying on the weak, volatile thermo-optic or electro-optic effect of silicon usually suffers from a large footprint and energy consumption. Here, integrating a phase-change material,…
View article
Thin film lithium niobate electro-optic modulator with terahertz operating bandwidth Open
We present a thin film crystal ion sliced (CIS) LiNbO3 phase modulator that demonstrates an unprecedented measured electro-optic (EO) response up to 500 GHz. Shallow rib waveguides are utilized for guiding a single transverse electric (TE)…
View article
Spiral phase contrast imaging in nonlinear optics: seeing phase objects using invisible illumination Open
Spiral phase contrast (SPC) imaging offers a vital, convenient tool for edge detection in image processing. Despite significant experimental and theoretical progress in this area, SPC imaging with invisible light is still lacking. In contr…
View article
Design, analysis, and transmission system performance of a 41 GHz silicon photonic modulator Open
The design and characterization of a slow-wave series push-pull traveling wave silicon photonic modulator is presented. At 2 V and 4 V reverse bias, the measured -3 dB electro-optic bandwidth of the modulator with an active length of 4 mm …
View article
Ultra-compact nonvolatile phase shifter based on electrically reprogrammable transparent phase change materials Open
Optical phase shifters constitute the fundamental building blocks that enable programmable photonic integrated circuits (PICs)—the cornerstone of on-chip classical and quantum optical technologies [1, 2]. Thus far, carrier modulation and t…
View article
All-optical graphene modulator based on optical Kerr phase shift Open
Graphene-based optical modulators have recently attracted much attention because of their characteristic ultrafast and broadband response. Their modulation depth (MD) and overall transmittance (OT), however, are often limited by optical lo…
View article
Ultra-high electro-optic activity demonstrated in a silicon-organic hybrid modulator Open
Efficient electro-optic (EO) modulators crucially rely on advanced materials\nthat exhibit strong electro-optic activity and that can be integrated into\nhigh-speed and efficient phase shifter structures. In this paper, we\ndemonstrate ult…
View article
Graphene controlled Brewster angle device for ultra broadband terahertz modulation Open
Terahertz modulators with high tunability of both intensity and phase are essential for effective control of electromagnetic properties. Due to the underlying physics behind existing approaches there is still a lack of broadband devices ab…
View article
A BaTiO<sub>3</sub>-Based Electro-Optic Pockels Modulator Monolithically Integrated on an Advanced Silicon Photonics Platform Open
To develop a new generation of high-speed photonic modulators on\nsilicon-technology-based photonics, new materials with large Pockels\ncoefficients have been transferred to silicon substrates. Previous approaches\nfocus on realizing stand…
View article
110 GHz CMOS compatible thin film LiNbO3 modulator on silicon Open
In this paper we address a significant limitation of silicon as an optical material, namely, the upper bound of its potential modulation frequency. This arises due to finite carrier mobility, which fundamentally limits the frequency respon…
View article
Speckleless holographic display by complex modulation based on double-phase method Open
The purpose of this study is to implement speckle reduced three-dimensional (3-D) holographic display by single phase-only spatial light modulator (SLM). The complex amplitude of hologram is transformed to pure phase value based on double-…
View article
Unlocking Spectral Efficiency in Intensity Modulation and Direct Detection Systems Open
A number of inherently unipolar orthogonal frequency division multiplexing (OFDM) modulation schemes have been introduced recently in an attempt to improve the energy efficiency of OFDM-based intensity modulation and direct detection (IM/D…
View article
Distributed fiber-optic vibration sensing based on phase extraction from time-gated digital OFDR Open
A novel distributed fiber vibration sensing technique based on phase extraction from time-gated digital optical frequency domain reflectometry (TGD-OFDR) which can achieve quantitative vibration measurement with high spatial resolution and…
View article
Plasmonic modulator with >170 GHz bandwidth demonstrated at 100 GBd NRZ Open
We demonstrate a plasmonic Mach-Zehnder (MZ) modulator with a flat frequency response exceeding 170 GHz. The modulator comprises two phase modulators exploiting the Pockels effect of an organic electro-optic material in plasmonic slot wave…
View article
Broadband Nonreciprocal Amplification in Luminal Metamaterials Open
Time has emerged as a new degree of freedom for metamaterials, promising new\npathways in wave control. However, electromagnetism suffers from limitations in\nthe modulation speed of material parameters. Here we argue that these\nlimitatio…
View article
Comparison of nematic liquid-crystal and DMD based spatial light modulation in complex photonics Open
Digital micro-mirror devices (DMDs) have recently emerged as practical spatial light modulators (SLMs) for applications in photonics, primarily due to their modulation rates, which exceed by several orders of magnitude those of the already…
View article
An all-optical modulator based on a stereo graphene–microfiber structure Open
An in-line, all-optical fiber modulator based on a stereo graphene–microfiber structure (GMF) utilizing the lab-on-rod technique was demonstrated in this study. Owing to its unique spring-like geometry, an ultra-long GMF interaction can be…
View article
Engineering the Phase Front of Light with Phase-Change Material Based Planar lenses Open
A novel hybrid planar lens is proposed to engineer the far-field focusing patterns. It consists of an array of slits which are filled with phase-change material Ge 2 Sb 2 Te 5 (GST). By varying the crystallization level of GST from 0% to 9…
View article
High-fidelity distributed fiber-optic acoustic sensor with fading noise suppressed and sub-meter spatial resolution Open
In order to solve fading problem and realize sub-meter spatial resolution in DAS, this paper proposes a novel configuration of time-gated digital optical frequency domain reflectometry (TGD-OFDR) based on optical intensity modulator (IM). …
View article
A review of liquid crystal spatial light modulators: devices and applications Open
Spatial light modulators, as dynamic flat-panel optical devices, have witnessed rapid development over the past two decades, concomitant with the advancements in micro- and opto-electronic integration technology. In particular, liquid-crys…
View article
High-speed spatial control of the intensity, phase and polarisation of vector beams using a digital micro-mirror device Open
The dynamic spatial control of light fields is essential to a range of applications, from microscopy to optical micro-manipulation and communications. Here we describe the use of a single digital micro-mirror device (DMD) to generate and r…