Ultra-Wideband Tunable Thin-Film Lithium-Niobate-on-Insulator Microwave Photonic Filter

ACS Photonics, Год журнала: 2025, Номер unknown

Опубликована: Март 5, 2025

To meet the growing demand for high-frequency and broadband wireless communications, extending microwave frequencies to millimeter-wave range is essential. Microwave photonic filters (MPFs), as key components in systems, are used select target signals reduce channel interference. However, achieving MPFs with a tuning beyond 40 GHz remains challenging due limited bandwidth of electro-optical devices optical filters. In this study, we demonstrate reconfigurable integrated MPF based on thin-film lithium-niobate-on-insulator platform. The achieves widest operational from 2 62 tunable frequency resolution 0.7 3 GHz. Additionally, filter enables selection Gbit/s data rates communication, offering practical scalable solution future applications.

Язык: Английский

---

Ultracompact Integrated Huygens’ Meta-Splitters

ACS Photonics, Год журнала: 2025, Номер unknown

Опубликована: Апрель 6, 2025

Язык: Английский

---

Silicon photonic transmitter and receiver for hybrid multiplexing systems

Chip, Год журнала: 2025, Номер unknown, С. 100148 - 100148

Опубликована: Апрель 1, 2025

Язык: Английский

---

A Broadband Thin-Film Lithium Niobate Modulator Using an Electrode with Dual Slow-Wave Structures

Photonics, Год журнала: 2025, Номер 12(5), С. 452 - 452

Опубликована: Май 7, 2025

With the rapid development of information technology, global data volume has been continuously expanding, placing unprecedented demands on communication networks to accommodate precipitously increasing throughput. Thin-film lithium niobate (TFLN) modulators, characterized by their large theoretical bandwidth, low half-wave voltage, and suitability for high-density integration, show great application potential in high-speed optical modules interconnection networks. However, persistent issue velocity mismatch between radio frequency (RF) signals carriers invariably hinders utilization higher-frequency bands, which restricts modulation speed fabricated devices. In this paper, an electrode co-loaded with square serrations T-shaped stubs was utilized achieve precise matching excellent impedance matching. Leveraging approach, a TFLN modulator chip electro-optic bandwidth far exceeding 67 GHz return loss greater than 12 dB successfully silicon substrate. The RF can be tuned altering lengths slow-wave structures, provides guidance design optimization broadband modulators.

Язык: Английский

---

High- Q unidirectional polarization singularities

Physical Review Applied, Год журнала: 2025, Номер 23(5)

Опубликована: Май 8, 2025

---

Collective Electromagnetically Induced Transparency‐Like Slow Light Effect Enhanced by Flatband in All‐Dielectric Kagome Metasurfaces

physica status solidi (RRL) - Rapid Research Letters, Год журнала: 2025, Номер unknown

Опубликована: Май 11, 2025

Slow light is a fascinating research area that of fundamental interest and has enabled diverse applications. Electromagnetically induced transparency (EIT), or its analogies, flat band are two distinct approaches to realize the slow effect in photonic systems. Here, these methods combined propose flatband‐enhanced collective EIT‐like slow‐light all‐dielectric kagome metasurfaces. The Q ‐factor, group index, near‐field electric‐field enhancement can be significantly improved for window enhanced by flatband, compared one without such enhancement, shown. simulated transmittance spectra showing windows experimentally demonstrated. Making use windows, bulk sensitivities up 405 410 nm/RIU numerically obtained. Remarkably, reducing nanodisk size, an extremely large index 16 105 high intensity 8220 obtained silicon metasurface. This work expected provide new direction realizing strong metasurfaces with promising applications biochemical sensing, nanolasing, nonlinear optics.

Язык: Английский

---

High-Bandwidth Silicon Strip Waveguide-Based Electro-Optical Modulator in Series Push–Pull Configuration

Photonics, Год журнала: 2025, Номер 12(5), С. 484 - 484

Опубликована: Май 14, 2025

Silicon modulators operating at high speeds are crucial for contemporary optical communication systems; nevertheless, their performance is limited by the resistance–capacitance (RC) time constant. This research introduces a modulator based on silicon strip waveguide, also known as capacitively coupled (CC-Si), arranged in series push–pull (SPP) configuration, which effectively addresses constraints imposed RC The demonstrates consistent electro-optic (EO) response that extends to 68 GHz. Furthermore, it achieves phase shift of 0.022 radians C-band wave when exposed 15 GHz radio frequency (RF) modulation signal with an amplitude 2.45 V.

Язык: Английский

---

High-Speed Low-Complexity Optical PAM Links With a High-Slope-Efficiency Optical Modulator: Analysis and Demonstration

Journal of Lightwave Technology, Год журнала: 2024, Номер 42(10), С. 3554 - 3562

Опубликована: Фев. 19, 2024

Achieving high data rate with simple system configuration and low power consumption is of great interest in short-reach intensity-modulation direct-detection (IM-DD) fiber links for future datacenter networks, business local area networks so forth. For external modulation-based IM-DD, recently remarkable modulator performance has been achieved terms 3dB bandwidth, exploiting different materials/platforms. However, due to the relatively-high RF-to-RF (or end-to-end) signal loss, optical amplifiers (OA) and/or RF (RFA) were typically needed IM-DD links, which increases complexity dissipation. In this work, we present a more comprehensive figure merit (FoM) (and link) design, namely "slope efficiency (SLE)", takes into account not only bandwidth but also half-wave voltage RF/optical waveguide losses, can provide guiding principle design toward lower loss. With high-SLE modulator, both OA RFA be omitted even when supporting broadband signals CMOS-level driving voltages. We theoretically investigate impact modulators technology SLE on pulse amplitude modulation (PAM) link. Next, report series PAM transmission experiments Lithium Niobate intensity prototype, enables sub-1 V_pp driving, up-to-432Gb/s over up-to-600m single-mode C-band OA&RFA-free reception digital processing (DSP) complexity. instance, 384Gb/s PAM8 300m, transmitter was DSP-free while symbol-spaced decision-feedback equalizer (DFE) 61 feedforward taps 1 feedback tap sufficient receiver considering 16.7% hard-decision (HD)-FEC. Furthermore, experimentally show that supports ultra-wide bands (O-, S-, C- L-band).

Язык: Английский

---

Integrated Electro‐Optic Frequency Combs: Theory and Current Progress

Laser & Photonics Review, Год журнала: 2024, Номер 18(6)

Опубликована: Апрель 1, 2024

Abstract Optical frequency combs (OFCs) have evolved into one of the most active areas photonics, underpinning advancements in both fundamental science and commercial contexts. Electro‐optic modulation for OFC generation offers excellent versatility, stability, phase coherence. With rapid progress micro‐nano fabrication techniques, electro‐optic (EOFCs) been realized on many integrated platforms, including silicon insulator (SOI), indium phosphide (InP), lithium niobate (LNOI). These compact, low‐cost, energy‐efficient EOFCs support a wide range applications. In this study, we review theory EOFCs, summarize demonstrations main present applications, envision development directions view materials, devices,

Язык: Английский

---

Ultra-broadband MMI power splitter from 1.26 to 1.67 μm with photonic bound states in the continuum

Optics Communications, Год журнала: 2024, Номер 562, С. 130525 - 130525

Опубликована: Март 30, 2024

Язык: Английский

---