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A novel approach to achieve wavelength controlled optical beam steering using a 45° tilted fiber grating (TFG) for full-duplex indoor optical wireless transmission is proposed and experimentally demonstrated for the first time. The 45° TFG functions as an in-fiber passive diffraction device for wavelength steered light emission and reception, which enables full-duplex optical wireless transmission...
This paper proposes a novel fiber ring laser utilizing taper-coupled double-microsphere-cavities (TC-DMC) to stabilize its single-longitudinal-mode operating with a 0.01 nm narrow bandwidth. Fundamental properties including whispery gallery mode (WGM) mode distribution and transmission spectra in the DMC are investigated both theoretically and experimentally. Due to Vernier effect, the WGM spectrum...
A multiwavelength Er-doped fibre ring laser system using all fibre Lyot filter and highly nonlinear fibre was experimentally demonstrated, with degree of polarization up to 99.9% and 50 channels output.
A high-quality nanolayer graphene (NLG) coated hollow core fiber (HCF) platform has been demonstrated for accurate monitoring of refractive index (RI) changes so far mainly operate in liquids but not in air. The NLG with high index is deposited on the outer surface of the HCF, and an enhanced anti-resonant reflecting guidance is formed, which induces sharp periodic lossy dips in the transmission spectrum...
In this paper, we propose a simplified nonlinear Volterra algorithm with feed-forward equalizer and decision feedback equalizer for 40Gb/s PAM4 transmission with 10G-class devices in next-generation access network. Results show that the simplified Volterra algorithm significantly reduced algorithm complexity compared with traditional Volterra algorithm. Moreover, we achieve similar performance optimization...
A novel ultrafast and high spatial-resolution interrogation method for fully distributed chirped fibre Bragg grating sensors based on photonic time-stretch frequency-domain reflectometry is presented. Real-time interrogation at measurement speed of 50 MHz with a spatial resolution of 35 μm was experimentally demonstrated.
We propose a dual-parameter active fibre sensor based on a fibre ring laser using a single-mode-two-mode-single-mode (STS) fibre interferemeter and a four-mode FBG as the intracavity dual-parameter sensing element. The interferometric spectra of the STS are investigated with different core-offset parameters and few-mode fibre length. The highest LP11 mode excitation ratio is achieved with a 6µm core-offset...
The control of Light velocity is theoretically and experimentally demonstrated in a θ-shaped microfiber resonator with coupled-resonator-induced transparency. By adjusting the structure parameters, group delays from −60ps to 200ps are achieved in the all-fiber resonator.
In-fiber optical devices have low insertion loss, high reliability and compatibility with the fiber systems and transmission network. They are different from the in-line components that are typically produced by coupling the light in and out of the optical fiber to and from some bulk or integrated optical waveguide device, therefore, inducing high insertion loss. An in-fiber optical polarizer is a...
As the popularity of the smartphone is increasing, the number of people getting involved in accidents with vehicles while using their smartphones is also increasing. Pedestrians divert their attention from walking because of the attraction of smartphone, which causes the accidents. It is critical to design a pedestrian-oriented system to alert the pedestrian smartphone users to imminent dangers while...
Hybrid WDM/TDM enabled microstructure based optical fiber sensor network with large capacity is proposed. Assisted by Fabry-Perot filter, the demodulation system with high speed of 500Hz and high wavelength resolution less than 4.91pm is realized.
A high sensitive glucose sensor using microfiber based Mach-Zehnder interferometer (MZI) is proposed. Microfiber is firstly immobilized with glucose oxidase (GOD) and then employed as sensing probe in MZI. By tracking the shift of the interference spectrum, a high sensitivity up to 2.46nm. (mg/ml)−1 is achieved at the glucose concentration range of 0–3mg/ml.
As2S3 ring PCF is proposed for vortex modes. Two orders of magnitude improvement on mode separation is achieved. Engineered dispersion and high nonlinearity enable octave-spanning supercontinuum generation from 1196 to 2418 nm within 1-cm fiber.
We report simultaneous I/Q-data monitoring of 100-Gb/s RZ-DQPSK signal using a two-channel time-stretch enhanced recording (TiSER) oscilloscope. TiSER offers a solution to monitoring of high bit rate data.
We propose a slot-waveguide-based dispersion compensator with a negative dispersion of -181520 ps/nm/km. Dispersion compensation for a 320 Gb/s NRZ signal at 11-km fiber transmission has an eye-opening penalty of 4 dB.
We propose a compact silicon microring-based analog modulator for generation of 10-GHz sub-octave analog signals, which exhibit high optical modulation-index of up to 46% and carrier-to-noise ratio (CNR) of 57 dB. In fiber transmission, the CNR can be improved further by 10 dB with chromatic dispersion.
Long-period fibre gratings (LPGs) have previously been used to detect quantities such as temperature, strain and refractive index (RI). The responsivity to surrounding refractive index means that, potentially, LPGs could be realised as optical biosensors for applications in biochemical and biomedical application areas. We report here to our best knowledge the first investigation on refractive index...
The microchannelled chirped fibre Bragg grating (MCFBG) was fabricated using femtosecond laser processing and HF-etching. Intrinsical refractive-index sensitivity induced by the microchannel makes MCFBGs ideal for biochemical sensing.
We propose ultra-small silicon microring-based analog electro-optic modulators, which exhibit a better SFDR by 5-dB and higher modulation-index compared to MZMs. Third-harmonic-distortion is reduced by 10-dB in fiber transmission.
A hybrid waveguide Bragg grating in optical fiber was fabricated and characterized, showing thermal responsivity of 211 pm/??C. Proposed being used in fiber sensor, it demonstrates enhanced resolution by 20?? and 2?? for temperature and strain, respectively.
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