PolyU Institutional Repository
The PolyU IR collects, makes available, showcases, preserves and enhances the discovery of the research and scholarly output created by the PolyU community.
Journal articles, conference papers and presentations, technical reports, theses and dissertations, drawings, maps, datasets, images, videos and any other digital objects can be stored here. Deposited materials will be preserved and made available on the web.
Starting from September 2010,
PolyU Adopts Open Access Policy in Support of Open and Unrestricted Access to Published Research.
Stress and hydraulic pressure sensor based on a dual-core photonic crystal fiber
A dual-core photonic crystal fiber (DC-PCF) sensor based on fiber Mach-Zehnder interferometer is proposed and demonstrated for stress sensing with a sensitivity of 1.4 pm/& #956;& #1013; and hydrau...
Novel optical sensors based on integration of fiber micro-machining with sensitive thin films
The combination of fiber optics with micro-structure and sensitive thin films offers
great potential for novel sensor concepts. This paper reviews some works on the integration of thin films with ...
Multiple transmission filters for enhanced energy in modelocked fiber lasers
We demonstrate that incorporating multiple sets of waveplates and polarizers in a ring cavity laser allows for the suppression of multi-pulsing and a significant enhancement (an order of magnitude)...
Micro-engineered optical fiber sensors fabricated by femtosecond laser micromachining
Micro-structures in optical fiber created by femtosecond laser micromachining can function as the sensing elements. Different types of micro-structures can be combined together in single optical fi...
Implementation and characterization of polarimetric heterodyning fiber grating laser sensors
In this paper, we briefly review our recent work on polarimetric heterodyning fiber grating laser sensors, including the characterization, implementation, and multiplexing of the polarimetric sensors.
Impact of optical modulators in LTE RoF system with nonlinear compensator for enhanced power budget
Nonlinear propagation compensation for LTE-RoF system is experimentally demonstrated with proposed DMFD and EMFD methods. We discovered that the RoF dithering frequency requirement have to be much ...
High-degree pulse compression with a convex dispersion profile
We consider the non-adiabatic pulse compression of a cascaded third order soliton propagating in three consecutive optical fiber segments, each of which has a convex dispersion profile with two zer...
Gas detection with micro and nano-engineered optical fibers
The prospects for realization of all-fiber gas sensors with hollow-core photonic bandgap fibers and tapered micro/nano optical fibers are investigated. Issues such as high background level and slow...
Power-referenced and self-calibrated PM-FBG vibroscope
A compact vibration sensing probe, in which a short section of polarization-maintained (PM) fiber stub containing a normal straight fiber Bragg grating (FBG) is spliced to another single-mode fiber...
Optical Performance Monitoring through signal processing in current and future optical communication systems
We review the current status of Optical Performance Monitoring(OPM) in deployed optical networks and discuss on emerging OPM trends and challenges brought about by the migration towards coherent co...
Optimization of a feedforward symbol timing estimator using two samples per symbol for optical coherent QPSK systems
A feedforward symbol timing estimator using only two samples per symbol is proposed and optimized for optical coherent QPSK signal. Simulation results are presented and discussed.
Generation of square or hexagonal 16-QAM signals using a single dual drive IQ modulator driven by binary signals
A simple square or hexagonal 16-QAM generation technique using a commercially available dual drive IQ modulator driven by 4 binary signals is proposed. Square or hexagonal polarization multiplexed ...
High order modulation formats for multi-Terabit optical communication systems
This paper reviews some of the recent progress in research community in increasing the spectral efficiency of optical communication systems through the use of high order modulation formats and cohe...
Generation of 64-QAM signals using a single dual-drive IQ modulator driven by 4-level and binary electrical signals
A simple square 64-QAM generation technique using a commercially available dual- drive IQ modulator driven by 4-level and binary electrical signals is proposed. Polarization multiplexed (PM) 64-QAM...
Fast and robust chromatic dispersion estimation using auto-correlation of signal power waveform for DSP based- coherent systems
We propose chromatic dispersion (CD) estimation technique by using auto-correlation of signal power waveform for DSP based-coherent systems. Simulation results demonstrate 10-fold estimation time r...
Effective single reflection peak from large diameter microfiber Bragg gratings
We experimentally demonstrated that the taper length of larger diameter microfibers can be controlled to filter out the higher order modes of LP0N to cladding mode to obtain a single reflection peak.
Contact force sensor based on microfiber Bragg grating
We demonstrate a miniature contact force sensor based on a 30-µm diameter microfiber Bragg grating packaged with a conforming elastomer material features extremely high sensitivity up to 0.8-mN to ...
Compact broadband amplified spontaneous emission in Tm³⁺-doped tungsten tellurite glass double-cladding single-mode fiber
We reported the ~2 μm amplified spontaneous emission (ASE) performance of highly Tm³⁺-doped (3.76 × 10²⁰ ions/cm³) tungsten tellurite single-mode fibers. The double-cladding fiber was pumped by a c...
Image reconstruction of fluorescent molecular tomography based on the simplified matrix system
Fluorescent molecular tomographic image reconstruction usually involves repeatedly solving large-scale matrix equations, which are computationally expensive. In this paper, a method is proposed to ...
High-repetition-rate ultrashort pulse generation in nonlinear fibers with exponentially decreasing dispersion
A simple method for the generation of ultrashort pulse train with high-repetition-rate is proposed and demonstrated numerically.
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