Independent light propagation through one or multiple modes is commonly considered as a basic demand for mode manipulation in few-mode fiber(FMF)-or multimode fiber(MMF)-based opticalsystems such as transmission link...
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Independent light propagation through one or multiple modes is commonly considered as a basic demand for mode manipulation in few-mode fiber(FMF)-or multimode fiber(MMF)-based opticalsystems such as transmission links,optical fiber lasers,or distributed optical fiber ***,the insertion of doped-fiber amplifiers always kills the entire effort by inducing significant modal *** this paper,we propose the design of doped-fiber amplifiers in FMF-based systems adopting identical multiple-ring-core(MRC)index profiles for both passive and doped fibers to achieve low modal *** develop the direct-glass-transition(DGT)modified chemical vapor deposition(MCVD)processing for precise fabrication of few-mode erbium-doped fibers(FM-EDFs)with MRC profiles of both refractive index and erbium-ion doping ***,a few-mode erbium-doped-fiber amplifier(FM-EDFA)with a maximum gain of 26.08 dB and differential modal gain(DMG)of 2.3 dB is realized based on fabricated FM-EDF matched with a transmission FMF supporting four linearly polarized(LP)*** the insertion of the FM-EDFA,60+60 km simultaneous LP_(01)∕LP_(11)∕LP_(21)∕LP_(02)transmission without inter-modal multiple-input multiple-output digital signal processing(MIMO-DSP)is successfully *** proposed design of low-modal-crosstalk doped-fiber amplifiers provides,to our knowledge,new insights into mode manipulation methods in various applications.
Based on an accurate model for the relationship between refractive indices and wavelengths in germanium-doped fibers, a weakly-coupled low-chromatic dispersion (CD) FMF is designed and fabricated with CD values lying ...
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Non-Hermitian system has attracted extensive attention, which possesses real eigenvalues if the Hamiltonian satisfies the parity-time (PT) symmetry. In this paper, we adopt the concept of PT symmetry to the widely use...
Non-Hermitian system has attracted extensive attention, which possesses real eigenvalues if the Hamiltonian satisfies the parity-time (PT) symmetry. In this paper, we adopt the concept of PT symmetry to the widely used directional coupler and theoretically analyze its amplitude and phase characteristics. Finally, we propose an on-chip isolator based on the nonreciprocal characteristic of passive PT symmetric directional coupler. Our proposal can avoid the introduction of the gain on chip or magneto-optical materials.
We demonstrate a multi-beam optical phased array based on a 4×4 Butler matrix. The device shows the capability of two-dimensional multi-beam steering with a pm 30^{circ}×8^{circ} field-of-view through a shar...
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High-efficiency and ultralow-power electro-optic tuning devices are key components in photonic integrated circuits. Silicon photonic technology is considered to be promising for large-scale and low-cost integration. H...
High-efficiency and ultralow-power electro-optic tuning devices are key components in photonic integrated circuits. Silicon photonic technology is considered to be promising for large-scale and low-cost integration. However, silicon does not exhibit any Pockels effect, and the electro-optic tuning based on free-carrier dispersion suffers from challenges such as high power consumption, and large optical propagation loss. Here, a new hybrid lithium tantalite-silicon platform is proposed for ultra-low-power electro-optic tuning based on the Pockels effect. Benefitting from the strong Pockels coefficients of lithium tantalite thin film, an EO tunable lithium tantalite-silicon hybrid microring is demonstrated. The quality factor and extinction ratio are 17000 and 10 dB, respectively. The linear bidirectional wavelength tuning efficiency is measured as 12.8 pm/V. The proposed platform extends the toolbox of silicon photonics technology, which pave a way for high-speed modulators and phase shifters in opticalcommunication and optical phased array.
A polarization splitter rotator (PSR) is a highly promising solution for polarization management in photonic integrated circuits (PICs). This paper proposes a PSR structure design based on AlGaAs-on-insulator (AlGaAsO...
A polarization splitter rotator (PSR) is a highly promising solution for polarization management in photonic integrated circuits (PICs). This paper proposes a PSR structure design based on AlGaAs-on-insulator (AlGaAsOI) platform. The device is capable of achieving TM 0 TE 0 conversion on AlGaAsOI, as demonstrated by simulation results.
We present a polarization-diversity coherent receiver that enables wavelength-multiplexed reception without arrayed waveguide gratings. We compensate in-phase and quadrature imbalance using a MIMO equalizer, enabling ...
We present a polarization-diversity coherent receiver that enables wavelength-multiplexed reception without arrayed waveguide gratings. We compensate in-phase and quadrature imbalance using a MIMO equalizer, enabling a 1.44-Tb/s capacity of wavelength-division-multiplexed and polarization-division-multiplexed 16-ary quadrature-amplitude-modulation signals.
In this paper, we design and experimentally demonstrate a photonic crystal nanobeam cavity device based on the Si 3 N 4 loaded LNOI platform with a mode volume of 3.06 $\mu \mathrm{m}^{3}$, which is potential in achi...
In this paper, we design and experimentally demonstrate a photonic crystal nanobeam cavity device based on the Si 3 N 4 loaded LNOI platform with a mode volume of 3.06 $\mu \mathrm{m}^{3}$, which is potential in achieving low power devices. The device shows an insertion loss of 0.89 dB, and a 3-dB bandwidth of 0.284 nm.
Mode-pairing quantum key distribution (MP-QKD) is advantageous for long-distance secure communication, leveraging its simple implementation and quadratic scaling capacity. The post-measurement pairing in MP-QKD allevi...
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Mode-pairing quantum key distribution (MP-QKD) is advantageous for long-distance secure communication, leveraging its simple implementation and quadratic scaling capacity. The post-measurement pairing in MP-QKD alleviates the photon-coincidence demands, which are essential for surpassing the fundamental limit to the key-rate transmission. In this work, we propose an improved decoy-state MP-QKD protocol featuring a flexible and efficient pairing strategy. We prove the security of the proposed scheme by presenting an entanglement model for decoy-state MP-QKD. The simulation results show that the secret key rate (SKR) can be enhanced among all distances. Notably, compared with the original scheme [Nature communication 13 , 3903 (2022) [ CrossRef ] ], the improvement of SKR is greater than 65% within 375 km in the asymptotic case and greater than 50% within 400 km in the finite case. And the achievable distance can be extended in the finite case, especially with a small block length. The simulation results demonstrate the high efficiency of the proposed scheme, which is expected to promote the practical applicability of MP-QKD. Furthermore, the entanglement model could provide a theoretical framework for further security and performance analysis of decoy-state MP-QKD.
We propose a non-Hermitian silicon nitride $(\text{Si}_{3}\mathrm{N}_{4})$ microring resonators (MRRs) with a large tunable bandwidth and a large free space range (FSR) using an efficient titanium (Ti) heater. The p...
We propose a non-Hermitian silicon nitride $(\text{Si}_{3}\mathrm{N}_{4})$ microring resonators (MRRs) with a large tunable bandwidth and a large free space range (FSR) using an efficient titanium (Ti) heater. The partial Euler bend with variable-width waveguide is used to reduce the bending loss and the propagation loss of the MRR. The numerical simulation shows a wide bandwidth tuning range from 5.4 GHz to 97.3 GHz for the non-Hermitian MRRs with a FSR of 6.83 nm.
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