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We demonstrated femtosecond laser inscription of fiber Bragg gratings (FBGs) in a twin-core few-mode fiber (TC-FMF) for directional bend sensing. An FBG was selectively inscribed in one core of the TC-FMF by using an 800 nm femtosecond laser through a phase mask. Three resonance peaks at the wavelengths of 1549.05, 1547.65, and 1546.08 nm were observed in the reflection spectrum of the TC-FM FBG,...
We have demonstrated a thulium-doped mode-locked fiber laser incorporating carbon-nanotube-based saturable absorber (CNT-SA) with ring pattern for the first time. The mode-locking operation can be maintained an intracavity average power of 37.8 mW, indicating that CNT with ring pattern can enhance the thermal damage threshold of SAs near 2 μm.
We report an actively Q-switched fiber laser with cylindrical vector beam emission using a few-mode fiber Bragg grating as mode selection and acousto-optic modulator to achieve the ideal ns pulse. Both radially and azimuthally polarized beams have been obtained by tuning the polarization controllers. The generated Q-switched CVB operates at central wavelength of 1055.6 nm with a spectrum bandwidth...
In this work, a hybrid plasmonic microfiber knot resonator (HPMKR) is demonstrated as well as its multi-sense applications. A microfiber knot resonator (MKR) is attached to gold film and generates the hybrid plasmonic mode. The HPMKR has an extinction ratio of more than 10 dB in C-band, with the Q-factor of more than 47,000. For a chosen polarization, the resonator has an extinction ratio of nearly...
We demonstrate a novel polyvinyl chloride (PVC) diaphragm-based fiber-tip Fabry-Perot interferometer for gas pressure measurements with ultra-high sensitivity. The PVC diaphragm has been coated to the end facet of a well-cut standard single-mode fiber by use of a plastic welder. Ultrahigh pressure sensitivity of ∼66.07 nm/MPa at 1565 nm and a low temperature cross-sensitivity of —5.5 KPa/°C have been...
An optical passband filter based on transmission liquid crystal technology is proposed and demonstrated. The bandwidth, wavelength and attenuation can be tuned by controlling the voltage applied on the liquid crystal chips. The insertion loss is <3dB, bandwidth tunable range is from 50GHz to 5000GHz, attenuation range is from 0 to 15dB. The filter can meet the technical requirements of CDCF ROADM.
We demonstrated an optical fiber sensor with high sensitivity of temperature and refractive index, we can use it to measure temperature and refractive index simultaneously. The sensing head consists of a section of multimode fiber (MMF) and a section of multi-core fiber (MCF), which is connected between two segments of single-mode fibers to form a Mach-Zehnder interferometer (MZI). A short section...
In this paper, an integrated optoelectronic chip, which can transmit optical signal at 849.2nm and receive optical signal at 803nm, is proposed. It is constructed by integrating a VCSEL unit above a PIN-PD unit. Analysis show that, the VCSEL unit has a threshold current around 1mA and a maximum output power around 1.2mW at 849.2nm, the PIN-PD unit has a highest absorption quantum efficiency above...
Ultrasound technique has been widely applied in various areas such as diagnostic applications, structure health monitoring, etc. Most advanced applications require novel ultrasonic transmitters, where fiber optic technique has been proved to be a great candidate due to its compact dimension, high frequency, and highly harsh environment survivability. Therefore, extensive research has been conducted...
We report a 1.55μΜ square microcavity laser monolithically integrated on GaAs substrates. The mode characteristics of the microcavity laser are numerically investigated by three-dimensional finite difference time domain method. The dependences of the whispering-gallery modes on the width of the output waveguide and the etching depth are discussed. For the cavity with the side length of 12μm and the...
Crosstalk noise is a potential issue for optical router used by optical network-on-chip (ONoC). The huge crosstalk directly degrades the performance in optical signal-to-noise ratio (OSNR) at optical router level, and greatly limits the scalability at ONoC level. This paper proposes ILCOR, a low-crosstalk optical router using multi-layer coupled MR. The use of multi-layer coupled MR enables less waveguide...
In this paper, a method for detecting the photoelectric deviation of radar system based on tracking the Change 3 lander is presented. In this method, the accurate position of the lander is calibrated by using the relative position relationship between the Chang'e 3 lander and the feature points in the lunar surface image. Then the miss distance is obtained by calculating the relative position of the...
We demonstrate a dispersion managed Erbium doped all-fiber laser with 101.75MHz repetition rate using 45°TFG to realize mode locking based on nonlinear polarization rotation technique. In our experiment, stable dual-pulse tightly bound states were observed under the pump power of505mW.
A microfluidic gas flowmeter based on optical fiber Fabry-Perot interferometer(FPI) was proposed and demonstrated. The sensor was formed by two embedded optical fibers with a microfluidic gas channel running across the two end faces. The gas flowrate was first tested by monitoring the shift of the resonancewavelength of the FPI. The intensity demodulation method was then applied to investigate thedynamic...
By using a white light interferometer to monitor the angular misalignment at a splicing point between a polarization-maintaining fiber and a single-polarization fiber, a low loss hybrid single-polarization fiber ring resonator with a round-trip loss of 0.98dB is fabricated. The misaligned angle at each splicing point is reduced from 10°to 1°, and the average splice loss is reduced by approximately...
Characteristic of two cascaded Mach-Zehnder interferometers based on spherical-shape structures is investigated. When the light in the fiber core is excited into high-order cladding mode, part of the light can propagate along the fiber cladding for a long distance. By cascading two identical interferometers formed by dual spherical-shape structures, it proves that the high-order cladding modes are...
A magnetic field sensor based on a novel phase-shifted fiber Bragg grating with magnetic fluid is proposed and experimentally demonstrated. It is fabricated by cleaving a uniform fiber Bragg grating at the center point, introducing a micrometre gap as a phase-shift and then filling the gap with magnetic fluid. External applied magnetic field changes refractive index of the magnetic fluid, leading...
The performance of an integrated triple wavelength tunable filter based on the electro-optic effect in Lithium Niobate is proposed and analyzed. The filter contains four Bragg waveguide gratings, which separated by three waveguides and three pairs of electrodes. Three pairs of electrodes on both side of three waveguides is used to tune the phase shift caused by the waveguides. As a result, the wavelength...
An echelle diffraction grating (de)multiplexer with arc-shaped grating teeth, based on a multi-guide vertical integration platform in InP is presented. The device can be applied to the 100GBASE-LR4 Ethernet systems, the crosstalk is better than −19 dB. By adjusting grating facets, the 3-dB spectral bandwidth is increased to 2.2 nm compared with 1.7 nm in a conventional design with a loss penalty less...
We propose a high efficient graphene-on-gap modulator (GOGM) by employing the hybrid plasmonic effect, whose modulation efficiency is ∼8-folds larger than that of present graphene-on-silicon modulator (GOSM) (∼0.1 dB / μm). The proposed modulator has the advantage of short modulation length ∼3.6 μm, relatively low insertion loss ∼0.32 dB and larger modulation bandwidth ∼0.48 THz. Moreover, an efficient...
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