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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...
A volatile organic compounds (VOCs) sensor based on intrinsic Fabry-Perot interferometer (IFPI) coated with polypyrrole thin film was proposed and experimentally demonstrated. The IFPI consists a section of hollow-core fiber (HCF) sandwiched between two single mode fiber. The polypyrrole is formed chemically via interfacial polymerization technique and coated directly onto the fiber. As the isopropanol...
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...
An optical fiber Nickel ions (Ni2+) sensor based on a Mach-Zehnder interferometer (MZI) formed by cascading two coating-functionalized fiber tapers is proposed and experimentally demonstrated. The functional coating is a multi-layer film of chitosan/muli-walled carbon nanotubes (MWCNT)/poly acrylic acid (PAA) formed directly onto the fiber surface via a layer-by-layer assembly technique. As the heavy...
A novel Mach-Zehnder interferometer (MZl) based on a pair of long period fiber gratings (LPGs) in an embedded-core hollow optical fiber (ECOF) are proposed and demonstrated experimentally. Two similar LPGs with peak attenuation of approximately 3dB are fabricated in an ECOF by using high-frequency CO2 laser to form an in-fiber MZI. The dependences of the resonant peak on the temperature and the axial...
In this letter, we propose and experimentally demonstrate an all-optical modulation format conversion scheme from amplitude shift keying (ASK) and quadrature phase shift keying (QPSK) to 8-ary quadrature amplitude modulation (8QAM), using four-wave mixing (FWM) effect in highly nonlinear fiber. In the FWM process, a 20-Gbits/s return-to-zero QPSK (RZ-QPSK) signal and a 10-Gbit/s ASK signal are utilized...
Chromatic dispersion (CD) and polarization mode dispersion (PMD) monitoring methods based on RF spectrum analysis are demonstrated experimentally. By using a narrow band FBG notch filter, centered at optical carrier/10GHz away from carrier, corresponding RF power ratio/power can be used as CD/PMD monitoring signal in high-speed optical communication systems such as 57-Gbit/s D8PSK.
We demonstrate a simple chromatic dispersion (CD) monitoring method using amplitude ratio of asynchronous delay-tap sampling plot. By utilizing amplitude ratio in the delay-tap sampling plot, the residual CD values in the range of 0~75 ps/nm can be measured for 40-Gbit/s 67% carrier-suppressed return-to-zero (CSRZ) differential quadrature phase-shift keying (DQPSK), 50% return-to-zero (RZ) DQPSK and...
A CD insensitive PMD monitoring scheme based on measuring RF power is demonstrated experimentally. By using a narrow band FBG notch filter, one of sideband is filtered out and the corresponding RF power can be used as CD insensitive PMD monitoring signal. It is experimentally shown that the proposed method is efficient on measuring the DGD values in 57-Gbit/s D8PSK and 38-Gbit/s DQPSK systems.
We propose a scheme on broadband multi-wavelength light source generation based on phase modulation in a ring. 125-channel light source with channel spacing of 10-GHz is demonstrated using a single phase modulator in a loop.
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