Electro-optic modulators are key components in data communication, microwave photonics, and quantum photonics. Modulation bandwidth, energy efficiency, device dimension crucial metrics of modulators. Here, we provide an important direction for the miniaturization electro-optic by reporting on ultracompact topological A interface state a one-dimensional lattice is implemented thin-film lithium-niobate integrated platform. Due to strong optical confinement peaking enhancement response, cavity...

Frequency diverse array (FDA) can provide a range-angle-dependent beam that be controlled by using frequency increment between adjacent elements, but the is fixed in basic FDA, which restraints performance improvement different environments significantly. In this letter, we propose an adaptive offset selection scheme to control transmit direction choosing adaptively. doing so, design of signal each step maximizing output signal-to-interference-plus-noise ratio (SINR) criteria. Our proposal...

In photonics, the idea of controlling light in a similar way that magnetic fields control electrons has always been attractive. It can be realized by synthesizing pseudomagnetic (PMFs) photonic crystals (PhCs). Previous works mainly focus on Landau levels and robust transport chiral states. More versatile over using complex nonuniform PMFs such as flexible splitting routing elusive, which hinders their application practical integrated circuits. Here we propose an universal systematic...

Abstract Topological edge states in valley photonic crystals (VPCs) have gained significant attention due to their capabilities for sharp‐turn transmission, defect immunity, and robust photon transport on chips. However, research the refraction within VPC domain integrated chips is still lacking, impeding various applications of VPCs. In this work, mechanisms topological modes at different external coupling boundaries are investigated, demonstrate interconnections switches a chip. The...

There has been renewed interest in coherent detection to provide high spectral efficiency transmission for short-reach optical interconnects. However, the expensive high-stable laser sources may preclude its potential application. To balance performance and low cost networks, self-coherent homodyne receiver investigated, where dual-polarization (DP) signal remote local oscillator (LO) originating from same source co-propagate over a duplex fiber, enabling remarkable tolerance of linewidth....

Data center interconnects require cost-effective photonic integrated optical transceivers to meet the ever-increasing capacity demands. Compared with a coherent transmission system, complex-valued double-sideband (CV-DSB) direct detection (DD) system can minimize cost of circuit, since it replaces two stable narrow-linewidth lasers only low-cost un-cooled laser in transmitter while maintaining similar spectral efficiency. In carrier-assisted DD carrier power accounts for large proportion...

We introduce and experimentally demonstrate a modified Kramers-Kronig (KK) receiver with direct detection (DD) to realize an accurate optical field reconstruction at low carrier-to-signal power ratio (CSPR) condition. In our scheme, exponential operation is applied single-sideband (SSB) signal, rather than continuous-wave tone adding method in the conventional KK scheme. By this means, minimum phase condition (MPC) inherently satisfied, thus can be reconstructed accurately through relation...

In cost-sensitive application scenarios, increasing the data rate per channel under a limited receiver bandwidth is critical, and thus, transceivers with low costs high electrical spectral efficiencies (ESEs) are highly desirable. this Letter, we demonstrate modified silicon photonic (SiP) carrier-assisted differential detection (CADD) record ESE for single polarization. The of conventional CADD mainly by transfer function that originated from optical delay hybrid. We modify placing an...

Abstract High‐speed electro‐optic modulators are key components in modern communication networks and various applications that require chip‐scale modulation with large bandwidth, high efficiency, compact footprint. However, fundamental trade‐offs make it challenging to achieve these metrics simultaneously, thus new methodologies must be explored. To this end, a Mach–Zehnder modulator harnessing slow‐light waveguides capacitively loaded slow‐wave electrodes presented on silicon‐nitride‐loaded...

Coherent detection is advantageous in achieving high electrical spectral efficiency (ESE) relative to direct (DD), due its capability of field recovery. However, the stringent requirement on laser sources prevents it from being widely utilized cost-sensitive short-reach applications. Carrier-assisted differential (CADD) was proposed retrieve optical without needing for a narrow-linewidth local oscillator (LO) receiver. To realize compact CADD receiver, silicon photonic (SiP) integration...

Hypoxia is an important feature of the tumor microenvironment (TME). While targeting hypoxic TME emerging as a potential strategy for treating solid tumors including liver cancer. Recent studies have shown that hypoxia can regulate adaptation to through long non-coding RNA (lncRNA). In previous study, we identify novel hypoxia-activated lncRNA and termed it HABON. Here, demonstrated knockdown HABON caused necroptosis tissue inhibited subcutaneous growth SMMC-7721 cells in nude mice....

We propose and experimentally demonstrate a multiple input output - artificial neural network (MIMO-ANN) nonlinear equalizer (NLE) to process the complex quadrature amplitude modulation (QAM) signal in single-sideband (SSB) self-coherent detection (SCD) system. In proposed scheme, 2-by-2 MIMO structure with two ANNs is employed effectively mitigate distortions induced by in-phase (IQ) imbalance fiber effects. By using MIMO-ANN NLE, we successfully transmit 112-Gb/s SSB 16-QAM over...

A modified KK receiver based on an exponential operation is proposed to accurately reconstruct the field at a low CSPR in DD system. We experimentally demonstrate 2-dB sensitivity improvement after 40-km SMF transmission.

We experimentally demonstrate a 56-Gb/s vestigial sideband (VSB) modified duobinary (MDB) 4-level pulse amplitude modulation (PAM4) signal transmission over an 80-km single-mode fiber (SMF) in intensity-modulation and direct-detection (IM/DD) system without optical dispersion compensation. Compared to the conventional PAM4 shaping, MDB exhibits higher spectral efficiency (SE) due precoding. Moreover, if VSB is employed mitigate chromatic (CD)-induced power fading, suffers less image...

For high-capacity and short-reach applications, carrier-assisted differential detection (CADD) has been proposed, in which the optical field of a complex-valued double sideband (DSB) signal is reconstructed without using sharp-edge bandpass filter or local oscillator laser. The CADD receiver features transfer function with periodical nulls frequency domain, while signal-signal beat interference (SSBI) severely amplified around function. Since null magnitude at zero inevitable, guard band...

Coherent detection has the primary advantage of optical field recovery, which enables channel impairment compensation and advanced modulation formats for high-capacity transmission. On other hand, direct (DD) is more cost-effective due to its local oscillator (LO)-free detection. To gain recovery while preserving LO-free DD-based receivers, carrier assisted differential (CADD) been proposed retrieve complex-valued double-sideband (DSB) signal. In this paper, extend concept CADD, we propose a...

We experimentally demonstrate a silicon photonic carrier-assisted differential detection receiver with single-polarization 224-Gb/s 16-QAM signal transmitted through 80-km SMF. For an integrated direct transmission demonstration, we achieve the highest electrical spectral efficiency/# of polarizations 6.4 (net 4.6) b/s/Hz.

Abstract Ultra-low-power consumption and high-speed integrated switches are highly desirable for future data centers high-performance optical computers. In this study, we proposed an ultra-low-power silicon electro-optic switch based on photonic crystal nanobeam cavities a foundry platform. The showed ultra-low static-tuning power of 0.10 mW calculated dynamic switching 6.34 fJ/bit, with compact footprint 18 μm × 200 μm. Additionally, 136-Gb/s four-level pulse amplitude modulation signal...

The advancement of next-generation fiber-optic transmission requires higher-speed transceivers where cost, footprint and power consumption are critical consideration. Photonic integration provides an effective solution to reduce the cost by integrating diverse optoelectronic devices on chips. In particular, complementary metal–oxide–semiconductor (CMOS)-compatible silicon photonics (SiP) has been considered as a promising platform with high density yield. Since coherent receiver relies local...

We demonstrate the first on-chip complementary polarization-diversity coherent receiver (C-PDCR) for rapid polarization tracking of remote LO. Based on electronic MIMO DSP, speed can reach 9 Mrad/s with negligible performance degradation a 70-Gbaud dual-polarization (DP) PCS-64QAM signal 630-Gb/s data rate (net 485 Gb/s).

Standard coherent communication technology is being introduced to short-reach optical communications further scale the link throughput by leveraging more degrees of freedom an channel. However, cost, footprint, and power consumption transceivers may impede its application interconnects. Silicon photonics has realized monolithic integration various optoelectronic components for on a single chip lower cost but except silicon laser. Heterogeneous been developed realize distributed feedback...

We propose and experimentally demonstrate a Tomlinson-Harashima precoding (THP) scheme with the coefficients computed by simulations. It realizes spectrally efficient faster-than-Nyquist (FTN) signaling for quadrature amplitude modulation (QAM) format. In our scheme, of THP precoder are obtained numerical simulations an additive white Gaussian noise (AWGN) channel, in which intersymbol interference (ISI) is induced digital FTN filter. Then, we apply these at transmitter to mitigate...

Complex-valued double-sideband (CV-DSB) direct detection (DD) is a promising solution for high capacity and cost-sensitive data center interconnects, since it can reconstruct the optical field as homodyne coherent receiver while does not require costly local oscillator laser. In carrier-assisted CV-DSB DD system, carrier occupies large proportion of total signal power but bears no information. Reducing to ratio (CSPR) improve information-bearing thus maximize achievable system performance....

We propose a complementary polarization-diversity coherent receiver (C-PDCR) based on polarization detection. The proposed C-PDCR features rapid tracking for remote LO using electronic DSP. robustness is verified by 1.08-Tb/s dual-polarization PCS-256QAM signal with up to 314-Krad/s speed.