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In this paper, a novel microfiber refractive index sensor prepared with tapering-twisting-tapering technique has been proposed and demonstrated for the first time. Experimental results show that the interference intensity of the novel microfiber increases with the increment of pre-tapered length and the intervening twist number. Furthermore, the refractive index sensitivity of this microfiber sensor...
Pluggable optics can potentiallly fuel the optical transport network in a more efficient and manageable manner. To enable this revolutionary packet-optical engine, integrated photonics seems to be the only possible solution. We introduce the latest industry trend of pluggable optical module form factors, and review the latest progress and challenges of pluggable optics products. Furthermore, we discuss...
Most sensors have the tradeoff dilemma of high sensitivity and large dynamic range. We demonstrate here an all-fiber refractive index sensor based on a composite intrinsic Fabry-Perot interferometer (FPI), which possesses the co-existence advantages of high sensitivity and large dynamic range. Experimental trends are in good agreement with the theoretical predictions. The co-existence of high sensitivity...
A methylcellulose (MC) coated humidity sensor by using photonic crystal fiber (PCF) based Mach-Zehnder interferometer (MZI) is proposed and experimentally demonstrated. It is fabricated by sandwiching a PCF between two standard single mode fibers (SMFs) with the air holes of the PCF in the fusion splicing region being fully collapsed. Experimental results show that this structure can not only carry...
A novel humidity sensor, which is based on Michelson interferometer (MI) with thin core fiber (TCF) coated with chitosanis proposed and experimentally demonstrated. Its principle is that the light in the single-mode fiber (SMF) core is excited into the cladding of the TCF, and the light transmitted from the end face of the TCF is reflected back to the SMF core. When the chitosan is coated on the end...
We propose and demonstrate a cascaded-cavities Fabry-Perot interferometer (FPI) for simultaneous measurement of pressure and temperature based on photonic crystal fiber. The sensor is composed of cascaded air-cavity and silica-cavity. The air-cavity and silica-cavity are both sensitive to temperature and pressure because of the thermo-optic coefficient and Young's modulus. We can obtain the pressure...
As in-line interference between geostationary(GEO) and Non-Geostationary(NGEO) systems is becoming more and more serious. We propose an efficient utilisation of the adaptive modulation and coding (AMC) scheme for spectral coexistence of GEO and NGEO satellites to mitigate in-line interference. Results of Simulation show that the proposed scheme can improve the performance of the NGEO system in comparison...
Ethylene is one of the important signature gases in spontaneous combustion forecasting of coal goaf area. It is very important to detect the concentration of ethylene accurately. However, the absorption spectrum of the other interfering gases is always in the ethylene spectrum during the ethylene detecting, which has a great impact on the ethylene's accuracy. In this paper, a spectral correction method...
Based on Tunable Diode Laser Absorption Spectroscopy (TDLAS) and the feature of Vertical Cavity Surface Emitting Laser (VCSEL) which wavelength scanning range up to several nanometers, the methane sensor system was designed. To verify the characteristic of anti-cross interference, we made some spectroscopy stimulation and experiments to analyze the affects to the methane measurement results of the...
In this paper, a kind of theoretical method of how to find out the dominant cladding modes in the all in-fiber interferometer is proposed. The relationship between the cladding modes spatial frequency and its modal order and sensing optical fiber length are simulated. It can be found that the fiber length increasing can make the value of the dominant cladding spatial frequency linearly increase. The...
A miniature pH sensor by using a tapered thin-core optical fiber based Mach-Zehnder interferometer coated with a pH sensitive film is demonstrated. Polyvinyl alcohol (PVA) and polyacrylic acid (PAA) were used to form a membrane structure on the taper by laminating self-assembly technique. By measuring wavelength change of the interference pattern or optical intensity, we achieved high sensitivity...
A service-aware dynamic bandwidth allocation with CoMP is proposed in the heterogeneous 5G fronthaul network. Simulation results show that the throughput and delay performance of users have been improved, and the QoS for high priority users can be guaranteed preferentially.
A magnetic field optical fiber sensor based on Sagnac interference is proposed by inserting a silica tube filled with magnetic fluid into the Sagnac loop. The birefringence of the sensor is present in the loop, and the transmission spectrum as a function of the magnetic field intensity has been theoretically analyzed and experimentally demonstrated. The results show that the spectral response is proportional...
We have researched and compared several practical PMD measurement method, and improved the practical PMD measurement based on fixed analyzer. Using polarization controller results in a more stable system and more accurate result. Algorithms are launched to judge the extreme value points in the spectrum to get a more precise result.
Aiming at the problem that the dynamic arrival of the virtual network requests in the wireless network environment leads to the unbalanced allocation of the substrate network resources and the low acceptance rate of the subsequent requests, a topology-aware wireless virtual network embedding algorithm (WVNEA-TA) is proposed. By analyzing the dynamic topological attributes of the virtual network and...
We propose a novel mode converter (MC) based on multimode interference (MMI). This MC taking advantages of long-period fiber grating and multimode interference, it not only has high conversion efficiency, but also greatly reduces the interference between modes.
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