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To solve the phase deviation problem caused by antenna orientation centre deviation during the phase calibration of Monopulse tracking receiver on ship-borne sitcom station, a phase compensation method is proposed to enhance the phase calibration precision. The working principle of monopulse tracking receiver is discussed, the demodulation process of sum and difference signal, and the cause of phase...
A challenge is to measure the impairments of few-mode fiber (FMF) for mode division multiplexing (MDM) system, so as to quantify the few-mode fiber and compensate the impairments, and thus improves the transmission performance of MDM system. In this paper, the experimental setup of impairments measurement with the structure of Photonic Lantern and optical circulators is established. Not only the two...
Anti-resonant hollow-core fibers (AR-HCFs) have attracted intensive attention. In order to realize low-loss coupling between anti-resonant hollow-core fibers and solid-core fibers, tapered solid-core fibers are injected into the hollow-core of AR-HCFs. For the ice-cream type anti-resonant hollow-core fibers whose mode field diameter are about 35μm, the coupling efficiency is over 85% when the tapered...
We propose a high efficient graphene-on-gap modulator (GOGM) by employing the hybrid plasmonic effect, whose modulation efficiency is ∼8-folds larger than that of present graphene-on-silicon modulator (GOSM) (∼0.1 dB / μm). The proposed modulator has the advantage of short modulation length ∼3.6 μm, relatively low insertion loss ∼0.32 dB and larger modulation bandwidth ∼0.48 THz. Moreover, an efficient...
In this paper we propose and demonstrate a novel all-fiber fused-type mode selective coupler (MSC) that capable of converting LP01 mode to LP11 mode with high efficiency and purity. Unlike other coupler fabrication techniques for which single mode fiber (or few mode fiber) must be pre-tapered, the advantage of our proposed coupler is that pre-tapering is not required. Two different fibers of the MSC...
A terahertz (THz) polarization splitter based on asymmetric dual slotted core polymer fiber is proposed and numerically investigated. The dual slotted core composed of subwavelength-scale air slots that are independently suspended within the fiber, not only allows for single-mode propagation for the two orthogonal polarization modes with low absorption losses, but also enables them to couple with...
We proposed a portable online Raman detection system with all fiber components, by inserting two large-diameter optical fibers respectively into each end of the inner metal-coated capillary for Raman excitation and signal collection simultaneously. The all fiber structure not only could enhance the interaction length between the excitation beam and the detecting material, but also provide a very effective...
Weakly-coupled mode-division-multiplexing (MDM) is a promising approach to overcome the capacity crunch in optical transmission systems and networks. In this paper, we present the latest progresses of weakly-coupled MDM transmission over multi-mode fiber (MMF) or few-mode fiber (FMF) supporting large quantity of independent modes with intensity modulation and direct detection.
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.
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