A5066408050- Advanced Fiber Optic Sensors
- Photonic and Optical Devices
- Advanced Fiber Laser Technologies
- Photonic Crystal and Fiber Optics
- Optical Network Technologies
- Semiconductor Lasers and Optical Devices
- Advanced Photonic Communication Systems
- Laser-Matter Interactions and Applications
- Optical Coatings and Gratings
- Optical Coherence Tomography Applications
- Orbital Angular Momentum in Optics
- Advanced Optical Sensing Technologies
- Random lasers and scattering media
- Seismic Waves and Analysis
- Optical Polarization and Ellipsometry
- Physics of Superconductivity and Magnetism
- Advanced Optical Network Technologies
- Metal and Thin Film Mechanics
- Spectroscopy and Laser Applications
- Optical Wireless Communication Technologies
- Quantum and electron transport phenomena
- Glass properties and applications
- Molecular Junctions and Nanostructures
- Advanced Frequency and Time Standards
- Astronomical Observations and Instrumentation
OFS (United States)
2002-2024
K Lab (United States)
2023
Naos Marine and Molecular Laboratories
2006-2022
Avon (United States)
2022
California NanoSystems Institute
2020
University of Chinese Academy of Sciences
2020
Shanghai Institute of Optics and Fine Mechanics
2020
Chinese Academy of Sciences
2020
Wuhan University
2020
University of California, Los Angeles
2020
We present several applications of microstructured optical fibers and study their modal characteristics by using Bragg gratings inscribed into photosensitive core regions designed the air-silica microstructure. The unique revealed in these studies enable a number functionalities including tunability enhanced nonlinearity that provide platform for fiber device applications. discuss experimental numerical tools allow characterization modes fibers.
We report what is believed to be the first demonstration of optical fiber gratings written in photonic crystal fibers. The consists a germanium-doped photosensitive core surrounded by hexagonal periodic air-hole lattice silica matrix. spectra these allow for detailed characterization fiber. In particular, facilitate coupling higher-order leaky modes. show that spatial distribution and effective index modes are determined largely design grating unaffected refractive surrounding describe...
We describe the fabrication and distributed sensing capabilities of very long continuous fiber grating sensor arrays in a twisted multicore fiber. The gratings are fabricated fibers with UV transparent coating using flexible scalable reel-to-reel processing system. Single-frequency characterized optical frequency-domain reflectometry shape reconstruction algorithm to measure bend radius. Broadband reflection shown act as enhanced quasi-Rayleigh scattering elements allowing for temperature...
Two fundamental laser physics phenomena--dissipative soliton and polarisation of light are recently merged to the concept vector dissipative (VDS), viz. train short pulses with specific state (SOP) shape defined by an interplay between anisotropy, gain/loss, dispersion, nonlinearity. Emergence VDSs is both scientific interest also a promising technique for control dynamic SOPs important numerous applications from nano-optics high capacity fibre optic communications. Using specially designed...
Dispersion management is becoming paramount in high-speed wavelength-division-multiplexed lightwave systems, that operate at per-channel rates of 40 Gb/s and higher. The dispersion tolerances, these are small enough sources variation, negligible slower become critically important to network performance. At high-bit rates, active compensation modules may be required respond dynamically changes occurring the network, such as variations power, reconfigurations channel's path caused by add-drop...
We present a comprehensive study of mode propagation in range different air-silica microstructured fibers. The inscription both Bragg and long-period gratings (LPGs) into the photosensitive core region fibers has allowed us to generate complex transmission spectra from with various fill fractions increasing air-clad hole diameters. spectral characteristics for typical air-hole geometry's are explained qualitatively modeled using beam simulations, where numerical modeling corroborates...
Novel devices only offer reasonable telecommunication solutions when they can be packaged and manufactured efficiently at low cost. We demonstrate such a compact power efficient tunable dispersion compensating fiber Bragg grating (FBG) device. The device relies on distributed on-fiber thin-film heater deposited onto the outer surface of an unchirped FBG. Current flowing though thin film generates resistive heating that is governed by thickness profile metal film. A chirp in obtained using...
We investigate the comb linewidths of self-referenced, fiber-laser-based frequency combs by measuring heterodyne beat signal between two independent that are phase locked to a common cw optical reference. demonstrate lines can exhibit instrument-limited, subhertz relative across spectra from 1200 1720 nm with residual integrated jitter approximately 1 rad in 60 mHz 500 kHz bandwidth. The projected pulse timing is fs. This performance approaches Ti:sapphire combs.
Optical amplification beyond C- and L-bands may be a promising solution to increase the capacity of transmission systems. In this paper we reviewed different technologies, including semiconductor optical amplifiers (SOA), Raman doped fiber briefly discussing their advantages disadvantages. We found that while variety solutions are available, they have not been implemented in practical systems because, until recently, L- bands EDFA amplified provided sufficient capacity, lack complete...
We present a source of high power femtosecond pulses at 1550 nm with compressed the end single mode fiber (SMF) pigtail. The system generates 34 repetition rate 46 MHz, average powers greater than 400 mW. are generated in passively modelocked, erbium-doped laser, and amplified short, amplifier. output amplifier consists highly chirped picosecond pulses. These then standard fiber. While SMF pigtail do show low pedestal that could be avoided use bulk-optic compression, desire to compress is...
A phase-locked, self-referenced frequency comb generated by a mode-locked fiber soliton laser with tunable repetition rate is presented. The spacing of the set laser's rate, which can be scanned from 49.3 MHz to 50.1 while one tooth held phase-locked stable RF source. This variable repetitionrate should useful for wavelength and length metrology, synchronization different laser-based combs, generation precise swept sources.
We report on engineered fibers with enhanced optical backscattering that exceeds Rayleigh scattering limits by more than one order of magnitude. measure attenuation less 0.5 dB/km from 1,300 to 1,650 nm. By controlling the backscatter over a 1.5-km length, we compensate for this attenuation, resulting in higher signal at end fiber. demonstrate strength may be stabilized operation temperatures above 200°C least 3 weeks. show deleterious distortion due Kerr nonlinearity is within 10% standard...
We fabricate highly blazed, polarization-sensitive fiber grating taps and show how these may be used in combination with a UV-induced waveplate to form compact, in-fiber polarimeter. the polarimeter employed as feedback element control polarization use loop demonstrate stable, broadband (>70 nm) operation of
We examine the cladding-mode resonances of fiber gratings UV written into core a novel microstructured whose air regions are subsequently infused with polymer. The cladding spectrum changes temperature because strong dependence polymer refractive index and we show that these can be understood qualitatively using simple model polymer-silica waveguide. Our results imply wavelength amplitude tuning regimes for long period this tunability enhanced over conventional small effective inner diameter...
We demonstrate a method for introducing and dynamically tuning birefringence in microstructured optical fiber. Waveguide asymmetry the fiber is obtained by selective filling of air holes with polymer, tunability achieved temperature polymer's index. The tapered such that mode field expands into cladding efficiently overlaps polymer has been infused holes, ensuring enhanced low splice loss. Experimental results are compared numerical simulations made beam propagation confirm corresponds to...
We demonstrate scaling of the effective area higher-order mode, Er-doped fiber amplifiers. Two mode fibers, one with 3800 μm(2) A(eff) in LP(0,11) and 6000 LP(0,14) are demonstrated. Output beam profiles show clean higher order modes, S(2) imaging measurements low extraneous content. CW pulsed amplifier experiments reported. Nanosecond pulses amplified to 0.5 mJ pulse energy MW peak power.
We demonstrate fiber distributed feedback (DFB) lasers using Raman gain in two germanosilicate fibers. Our DFB cavities were 124 mm uniform Bragg gratings with a π phase shift offset from the grating center. pump was at 1480 nm and operated on single longitudinal mode near 1584 nm. In commercial fiber, maximum output power, linewidth, threshold 150 mW, 7.5 MHz, 39 W, respectively. highly nonlinear these figures improved to 350 4 4.3 both lasers, more than 75% of power transmitted, allowing...
We demonstrate a single-frequency Brillouin distributed feedback laser (DFB). The DFB cavity was 12.4 cm long fiber Bragg grating with π-phase shift offset from the center. It exhibited threshold of 30 mW and conversion efficiency pump to Stokes wave as high 27%. Higher-order waves were suppressed by more than 20 dB. output could be obtained in either forward or backward direction, simply changing orientation discrete phase respect propagation direction. operated over frequency range 1.2...
Abstract In this paper, we present the results of lab and pilot-scale testing a continuously enhanced backscattering, or Rayleigh fiber cable that can improve distributed acoustic sensing performance. addition, Rayleigh-enhanced is embedded within tight buffered configuration to withstand be compatible for field applications. The exhibits enhancement 13 dB compared standard silica single-mode while maintaining low attenuation ≤ 0.4 dB/km. We built phase-sensitive optical time domain...
We demonstrate for the first time a device that enables practical dispersion management of 160-Gb/s time-division multiplexer system (return-to-zero duty cycle: 30%). The dynamic is provided by an integrated chirp-tunable Bragg grating which capable recovering 2-ps pulses over tuning range 50 ps/nm with power penalty less than 1.3 dB.
We developed a simple silica-based BDFA with 80nm 6-dB gain-bandwidth flexibly centred within 1305–1325nm, and parameters comparable to EDFAs. The amplifier can extend 400GBASE-LR8 transmission (8×26.6 Gbaud/s PAM-4 channels) beyond 50 km of G.652 fiber.
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