Double harmonic mode-locking in soliton fiber ring laser acquired through the resonant optoacoustic coupling

APL Photonics, Journal Year: 2024, Volume and Issue: 9(5)

Published: May 1, 2024

Passive harmonic mode-locking of a soliton fiber laser locked to optoacoustic resonance (OAR) in the cavity ensures high-frequency operation, high pulse stability, and low timing jitter. However, repetition rate (PRR) such lasers is limited ∼1 GHz for standard fibers due available acoustic modes. Here, we address these limitations by demonstrating built from components subjected double (DHML). As an example, adjusted operate at 15th its matching OAR ∼199 MHz could be driven this particular frequency, thus reaching ∼12 GHz. This breakthrough made possible through controllable interactions short, 50 cm segment unjacketed fiber. We propose that precise alignment modes leads long-lived narrow-band vibration. vibration sets pace pulses circulating suppressing do not conform Vernier principle. The surviving modes, equally spaced cooperation with gain depletion recovery mechanism, facilitate formation stable sequences, enabling DHML. In process, rather than defines elementary step PRR tuning. Throughout entire tuning range, exhibits enhanced supermode suppression levels better ∼40 dB picosecond

Language: Английский

---

Dual-polarization Mode Microwave and RF Channelizer based on a Soliton Crystal Integrated Microcomb Source

Published: March 14, 2024

We report a dual-polarization radio frequency (RF) channelizer based on microcombs. With the tailored mismatch between FSRs of active and passive MRRs, wideband RF spectra can be channelized into multiple segments featuring digital-compatible bandwidths via Vernier effect. Due to use states, number spectral segments, thus instantaneous bandwidth (with certain resolution), doubled. In our experiments, we used 20 microcomb lines with ~ 49 GHz FSR achieve channels for each polarization, high slicing resolutions at 144 MHz (TE) 163 (TM), respectively; achieving an operation 3.1 2.2 (TM). Our approach paves path towards monolithically integrated photonic receivers (the key components—active MRRs are all fabricated same platform) reduced complexity, size, unprecedented performance, which is important wide applications signal detection.

Language: Английский

---

Optical frequency combs: Driving precision across the fundamental and applied research domains

APL Photonics, Journal Year: 2024, Volume and Issue: 9(6)

Published: June 1, 2024

Language: Английский

---

Integrated nanophotonic silicon-on-insulator polarizers with graphene oxide films

Published: Jan. 1, 2024

Language: Английский

---

Spectral broadening induced by self-phase modulation of femtosecond optical pulses in SOI nanowires with graphene oxide integrated films

Published: Aug. 8, 2024

We experimentally demonstrate enhanced spectral broadening of femtosecond optical pulses after propagation through silicon-on-insulator (SOI) nanowire waveguides integrated with two-dimensional (2D) graphene oxide (GO) films. Owing to the strong mode overlap between SOI nanowires and GO films a high Kerr nonlinearity, self-phase modulation (SPM) process in hybrid is significantly enhanced, resulting greatly improved pulses. A solution-based, transfer-free coating method used integrate onto precise control film thickness. Detailed SPM measurements using are carried out, achieving factor up ~4.3 for device 0.4-mm-long, 2 layers GO. By fitting ex-perimental results theory, we obtain an improvement waveguide nonlinear parameter by ~3.5 effective figure merit (FOM) ~3.8, relative uncoated waveguide. Finally, discuss influence length on broad-ening compare performance different coated These confirm silicon devices 2D

Language: Английский

---

Integrated Kerr microcomb-based photonic RF and microwave signal processing

Published: Aug. 14, 2024

Microcombs are powerful tools as sources of multiple wavelength channels for photonic RF signal processing. They offer a compact device footprint, large numbers wavelengths, and wide Nyquist bands. Here, we review recent progress on microcomb-based processors, including true time delays, reconfigurable filters, Hilbert transformers, differentiators, channelizers. The strong potential optical micro-combs photonics applications in terms functions integrability is also discussed.

Language: Английский

---

RF photonic fractional Hilbert transformers based on soliton crystal Kerr micro-combs

Published: Aug. 14, 2024

We report a photonic microwave and RF fractional Hilbert transformer based on an integrated Kerr micro-comb source. The source has free spectral range (FSR) of 50GHz, generating large number comb lines that serve as high-performance multi-wavelength for the transformer. By programming shaping according to calculated tap weights, we achieve both arbitrary orders broad operation bandwidth. experimentally characterize amplitude phase response different perform system demonstrations real-time transforms. ripple < 0.15 rad within 3-dB pass-band, with bandwidths ranging from 5 9 octaves, depending order. experimental results show good agreement theory, confirming effectiveness our approach new way implement transformers processing bandwidth, high reconfigurability, greatly reduced size complexity.

Language: Английский

---

Photonic transversal RF spectral filters using different Kerr optical microcombs

Published: Aug. 14, 2024

Integrated Kerr microcombs are emerging as a powerful tool sources of multiple wavelength channels for photonic RF and microwave signal processing mainly in the context transversal filters. They offer compact device footprint, very high versatility, large numbers wavelengths, wide Nyquist bands. Here, we review recent progress on microcomb-based reconfigurable filters, based both filter methods to optical bandwidth scaling. We compare contrast results achieved with comb spacing combs (200GHz) more finely spaced (49GHz) microcombs. The strong potential micro-combs photonics applications terms functions integrability is also discussed. Index Terms—Microwave photonics, micro-ring resonators.

Language: Английский

---

Graphene oxide for efficient self-phase modulation in silicon nitride nanowire waveguides

Published: Aug. 25, 2024

Self-phase modulation (SPM) is an important third-order nonlinear optical process that has been widely used in many applications, such as broadband sources, diodes, spectroscopy, pulse compression, and others. The ability to realize SPM based on-chip integrated photonic devices will reap attractive benefits of compact footprint, high stability, scalability, low-cost mass production. Here, we experimentally investigate enhanced silicon nitride (Si3N4) waveguides by integrating with 2D graphene oxide (GO) films. integration GO films achieved on Si3N4 through a solution-based, transfer-free, layer-by-layer coating method precise control the film thickness. We use both picosecond femtosecond pulses perform detailed measurements. Owing Kerr nonlinearity GO, GO-coated show significantly improved spectral broadening for compared uncoated waveguide, achieving factor up ~3.4 device 2 layers GO. Based experimental results which good agreement theory, obtain improvement waveguide parameter 18.4 coefficient (n2) about 5 orders magnitude higher than Si3N4. These reveal effectiveness improve performance waveguides.

Language: Английский

---

Graphene oxide for integrated nonlinear optical chips

Published: Aug. 30, 2024

Integrated photonic devices operating via optical nonlinearities offer a powerful solution for all-optical information processing, yielding processing speeds that are well beyond of electronic as providing the added benefits compact footprint, high stability, scalability, and small power consumption. The increasing demand high-performance nonlinear integrated has facilitated hybrid integration novel materials to address limitations existing platforms, such strong absorption or an inadequate nonlinearity. Recently, graphene oxide (GO), with its large nonlinearity, flexibility in altering properties, facile fabrication processes, attracted significant attention, enabling many improved performance capabilities. This paper reviews applications GO photonics. First, overview GO’s properties technologies needed on-chip is provided. Next, state-of-the-art reviewed, together comparisons different platforms incorporating GO. Finally, challenges perspectives this field discussed.

Language: Английский

---