We have fabricated a compact bi-parameter sensor by splicing a fiber Bragg grating (FBG) with two single-mode fibers with misalignment to form Mach-Zehnder interferometer (MZI) structure. The transmission dips corresponding to the FBG and MZI can be successfully observed to simultaneously detect the variations in temperature and surrounding refractive index.

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A hybrid wireless-over-fiber (WoF) transmission system based on multiple injection-locked Fabry–Perot laser diodes (FP LDs) is proposed and experimentally demonstrated. Such a hybrid WoF transmission system delivers downstream intensity-modulated 20-GHz microwave (MW)/60-GHz millimeter-wave (MMW)/550-MHz cable television (CATV) signals and upstream phase-remodulated 20-GHz MW signal.

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We proposed and experimentally demonstrated an all-optical modulation format conversion mechanism from 4 individual 12.5 Gbps to a 50 Gbps PDM RZ-QPSK by applying bidirectional cross-phase modulation (XPM) in a single HNLF. Besides, the timing-mismatch tolerance among all the signals in the proposed format converter is further analyzed.

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A single-mode injection-locked colorless laser diode for MMWoF-OFDM transmission is demonstrated, which implements the 25-km SMF transmitted 24-Gbit/s 64-QAM OFDM with BER of 6E-4. In addition, a remotely beat 35-GHz MMW carried 4-Gbit/s 16-QAM OFDM with BER of 3.7E-3 after 25-km SMF and 1.2-m free-space transmissions is also achieved.

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A high-sensitive fiber curvature based on the Mach-Zehnder Interferometer (MZI) is proposed and experimentally demonstrated by simply fusion splicing a section of hollow-optic fiber (HOF) filled with liquid crystal (LC) between two single mode fibers (SMF). The curvature performance is characterized by measuring the wavelength shifts and intensity changes. A nonlinear of the wavelength “blue shift” and minimum transmission is observed when we increase the curvature. The high sensitivities of wavelength shift-curvature and intensity-curvature are obtained

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An experimental study of a 1x12 optical fiber switch based on LCoS SLM is presented. Digital transmission test at a link speed of 1.25Gbps was initially applied to evaluate the switch performance. The measurement results shown that the BERs of all channels at output fibers were all less than 10^-9.

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A Mach-Zehnder interferometer formed by using chemically etched PCF is proposed. We first immerse a stub of PCF into BOE to remove the air-hole region. By splicing the etched PCF with two SMFs at both ends, a fiber Mach-Zehnder interferometer can be obtained with the temperature sensitivity of 23 pm/oC.

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We demonstrate driving circuit designs for the light-emitting-diode (LED) and receiver (Rx) to providing lighting and visible light communication (VLC) simultaneously. By using the proposed driving circuits, the VLC transmission distance can be significantly enhanced.

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Leveraging high transmission bandwidth and loss budget provided by high launch power, we experimentally demonstrate 4-λ 224-Gbps 32-CAP 60-km transmission using cost-effective 10-GHz- class EAM/PIN. Without any inline and pre-amplifier, the result confirms economical high-speed down- stream (>3-Gbps/ONU) for a 64-ONU LR-PON.

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We propose a new fabrication method to produce microtoroid resonators on LiNbO3. The LiNbO3 microdisks are first produced by utilizing RF sputtering, chemical etching, photolithography and selective ion implantation. Then the reverse-side thermal reflow is used to thicken the microdisk edge to form the microtoroid. The measured intrinsic Q factor is 2.2×104.

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A sensitivity-enhanced optical temperature sensor based on SiN micro-ring resonator incorporating nematic liquid crystal cladding is proposed. Its temperature-sensitivity for TM polarized light is as high as 1nm/oC between 25 and 33 oC and over 2nm/ oC at the temperature close to clearing temperature of 5CB cladding.

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A deviated-dual-mode master-to-slave injection-locked colorless FPLD pair is demonstrated for baseband 18-Gbit/s 64-QAM OFDM data transmission with BER of 1.6E-4. In addition, the remotely beat 47-GHz millimeter-wave carrier enables the passband transmission of 2-Gbit/s 4-QAM OFDM data with a BER of 2.9E-3, after 25-km SMF and 1.4-m wireless transmissions.

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A microwave bandpass filter was developed using a self-injection Fabry-Perot laser. The microwave filter consisted of a Fabry-Perot laser diode, an optical tunable filter, and an optical amplifier. The optical tunable filter can be flexibly used to adjust the 3 dB bandwidth of a microwave bandpass filter. The experimental results demonstrate that the proposed microwave filter is simple and effective.

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This work experimentally demonstrates a 60-GHz direct-detection PDM-OFDM system without polarization tracking at the receiver. A BER of 3.8x10-3 was achieved with all states of polarization over 10-km fiber and 3-m wireless MIMO transmission.

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In this paper, a distribute feedback laser diode (DFB LD) composed microwave photonic bandpass filter is proposed and experimentally demonstrated for subcarrier multiplexing (SCM)-based radio over fiber (RoF) transport systems. With the proposed scheme, the SCM-based RoF transport systems can be greatly simplified and the system transmission efficiency can be promoted and controlled.

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A proposed erbium-doped fiber (EDF) laser scheme and FBGs can achieve single-longitudinal-mode (SLM) and wavelength-tuning output by utilizing ring-filter. In the experiment, the output power and OSNR are also presented. Moreover, measurement of output stability is also performed in an observing time of 30 minutes.

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We report high-refractive-index TiO2 microdisk resonators fabricated by RF magnetron sputtering, photolithography, and chemical etching. The undercut structure is formed by chemical isotropic wet etching. The characteristics of the microdisk resonator are measured by using tapered fiber coupling method. The 20μm-diameter TiO2 microdisk has the Q factor of 1.732×103 and the FSR of 17.5nm.

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We designed and realized optical passive device on silicon photonic chips with standard 0.18-um bulk CMOS process. We designed wavelength division mutiplexers using ring resonators with different radii. The free spectral range of 8.6 to 5.8 nm is realized. The extinction raito of approximately 1dB verifies the high propagation loss of polysilicon optical waveguide.

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We numerically investigate the index-antiguided (IAG) slab waveguide, in which an additional dielectric layer is introduced. Numerical results obtained by the beam propagation method (BPM) show that, with the introduced dielectric layer, the leakage loss of pump is strongly reduced, and the behavior of signal is not affected.

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In this study, to fabricate graphene-based waveguides by using femtosecond laser direct writing on Ni and C hybrid (Ni@C) films are investigated. The fabrication method with only single-step not only provides better quality than that of chemical vapor deposited graphene, but also to modulate graphene-based waveguides’ conductivity by tuning voltage. The proposal provides a superior potential for fabricating multi- conductivity and low-cost graphene optoelectronic devices.

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Based on the concept of low-frequency spoof surface plasmon polaritons (spoof SPPs), a kind of leaky mode is proposed in a waveguide made of a subwavelength metal-block array with open slots. Experimental verification of such a leaky mode at microwave has been performed, and been shown to be consistent with the theoretical analysis.

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Optical fiber sensors for measuring refractive index and bending using a tilted fiber Bragg grating in single mode fibers and double clad fibers are fabricated and investigated into sensitivities. The experimental results demonstrate that the sensitivities of refractive index and bending are larger for single mode fibers than for double clad fibers.

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