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The design of polarization filter photonic crystal fiber based on surface plasmon resonance is proposed by using the finite element method. Numerical simulation results show that the polarization filter possesses short length of 250 μm and high extinction ratios of −168 dB at the communication wavelengths of 1.55 μm.
A polarization-independent optical filter based on SBS with a bandwidth of ∼10 MHz is proposed and experimentally demonstrated. By utilizing a depolarizer, which can reduce the DOP of pump to <5%, a PDG of <1 dB is obtained over 30 nm. Moreover, it can be used for high-resolution spectroscopy and realizes accurate measurement of signals in arbitrary SOP.
We present studies of two kinds of hybrid plasmonic annular resonators with different cross-sectional shapes of circle and square. Their performance as defined by the Q/V ratio is enhanced considerably with a reduction in their physical dimensions. There exists critical annular radii below which “circle ring” outperforms “square ring”.
Laser amplifiers based on the thin-rod (“single-crystal fiber”) and thin-tapered-rod Yb:YAG active elements are developed and tested. The ability of applying the new broadband Yb-doped materials in the thin-rod geometry is discussed and such active elements will be tested soon.
We find and study the phenomenon of single-mode excitation in a microring resonators dye laser. A submicron thickness silica ring embedded in a simplified hollow-core microstructured optical fiber (SHMOF) is used as a microring resonator. We discuss the factors that influence the single-mode excitation and analyze the principle.
High average and high peak power picosecond laser composed of ytterbium fiber oscillator, Yb:YAG thin-rod preamplifiers and Yb:YAG thin-disk multipass amplifier is under development. 82 W average power at 11.5 kHz repetition rate is achieved.
We report the distributed measurement of supercontinnum generation along highly nonlinear optical fibers with centimeter spatial resolution using photon-counting optical time-domain reflectometry.
In this paper, we report 1×7 optical splitters (OSs) with different splitting ratios in a rod-type silicon photonic crystal. Each OS is based on cascaded self-collimation ring resonators (CSCRRs) which consist of eight beam splitters formed by varying the radii of the rod. Light beams propagate in the CSCRR employing self-collimation effect. The theoretical transmission spectra at different outputs...
We propose and demonstrate a new method for the characterization of nonlinear multimode integrated devices that reconstruct the biphoton state produced trough spontaneous parametric down-conversion (SPDC) using classical sum-frequency generation measurements. The proposed method is experimentally demonstrated by predicting the state generated from a multi-channel integrated nonlinear waveguide device.
The 2-μm waveband has gained much attention due to its potential applications in data communications and optical sensing. This wavelength range is of particular interests for integrated platform as it is transparent for silicon and is free of two photon absorption. We experimentally demonstrate a 2-μm silicon focusing grating coupler with subwavelength structure. The theoretical coupling efficiency...
Trivalent cerium ions doped silica materials can be utilized as scintillator to detect ionizing radiation. At the same time, the damage induced by ionizing radiation can also influence the luminescence properties of Ce3+. In our research, we present the photoluminescence (PL) properties of Ce3+-doped silica materials prepared by sol-gel method after irradiation by 60Co gamma rays. The results show...
A novel physical-layer encryption method is proposed, utilizing analog key-waveform modulation with comb-shaped spectrum. The concept was proved numerically and experimentally in 5 Gbaud Nyquist QPSK. The EVM after decryption was around 20%.
Femtosecond operation of passively mode-locked Nd, La:CaF2 and Nd, La:SrF2 lasers pumped by low power laser diodes at 790 nm was investigated. The continuous trains of pulses with pulse duration of 783 fs at 1065 nm and 747 fs at 1060nm were obtained in resonators without GVD compensation in both cases for absorbed pump power lower than 1W.
A single frequency erbium-doped fiber laser with an on-chip high-Q silicon nitride (Si3N4) microring cavity is demonstrated. The laser linear cavity is composed of a microring with a Q of up to 2.5×105 and a free spectral range (FSR) of 2 nm, a 12 cm erbium-doped fiber and a fiber Bragg grating (FBG). The linewidth of 8 kHz is achieved.
Common surface plasmon resonance refractive index sensors often use side polished, tapered or etched fiber to enable evanescent wave to reach the metal-dielectric interface. These processes are often complex and make fiber fragile. In this paper, we fabricate a simple structure formed by multimode fiber and no-core fiber to stimulate surface plasmon wave. According to our research, the sensitivity...
We demonstrate cascade link multi-wavelength digital holography using optical frequency comb referenced synthesizer. This system expands the dynamic range of height in digital holography. In the experiment, 4 synthesized wavelengths and a single wavelength were cascaded, and steps of 10 mm and 21 μm are measured.
An As2Se3-based photonic quasi-crystal fiber (PQF) with high nonlinearity and birefringence is proposed. With femtosecond pulses at a wavelength of 2.94 μm as the pump pulses, mid-infrared broadband polarized supercontinuum is obtained in a 15 mm PQF. The spectral width of x-polarization and j-polarization covers from 1μm ∼10.2 μm and 1μm ∼12.5 μm, respectively.
We experimentally demonstrate a visible light indoor positioning based on camera with specular reflection cancellation. Results show that specular reflection is cancelled effectively and the robustness of the positioning system is improved significantly.
A volatile organic solutions (VOS) sensor with plasmonic metasurface is proposed and demonstrated in the near-UV wavelength range. The plasmonic metasurface device (PMD) is composed of the hybrid of metal/dielectric/semiconductor nanostructures. These nanostructures are fabricated by using natural lithography technique for wafer-level fabrication, which hybridized resonances could enhance electromagnetic...
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