Session Index

We demonstrate a broadband and steady EDF multiple-ring laser based on the octa-ring design together with Vernier operation for achieving SLM action. The available CW tunability range from 1571.0 to 1613.0 nm in L-band window. Moreover, the related output power, SLM oscillation, OSNR and stability appearances in the laser have been also explored.

  Preview abstract

We study the propagation mode of surface plasmon polariton in metallic nanohole. The dispersion relations of SPPs in a nanohole, solved from a transcendental equation, show that SPPs of mode-1 with a propagation length larger than the other modes. When the mode-1 propagates in the nanohole, the normal component of electric displacement on the nanohole’s surface with a helical distribution and the streamlines of Poynting vector exhibit helixes. Additionally, by using COMSOL we investigate the conversion of the helical SPP reaching at the nanohole’s outlet into a spiral SPP propagating outward on the metal film’s interface with the same handedness.

  Preview abstract

The modal effective index matching is used to design the waveguide structure through Shortcuts to Adiabaticity, the TE00 mode is matched to the TE11 mode, and the coupling efficiency is 63.6%, the spanning of the supercontinuum generation is observed. Finally, the CCD can observe clearly TE11 modal.

  Preview abstract

We design a dual-ring structure with a unpumped EDF saturable absorber (SA) to achieve wide and stable single-mode C- plus L-band EDF laser applying two parallel EDFAs as the gain medium. Here, we also verify the output power, OSNR, tunability, and stability of the proposed EDF ring laser.

  Preview abstract

In the study, we demonstrate a hybrid self-healing FSO-WDM-PON system. Here, the available WDM channels in C- and L-bands are applied for baseband and FSO access, respectively. Besides, to prevent the fiber breakpoint in baseband fiber network, the WDM network also can provide the re-routing fiber path for reconnection.

  Preview abstract

We have developed a simulation model for characterizing DWDM gain flattening Erbium doped fiber amplifiers with transient gain control. The dynamic gain in the presence of channel add-drop under both feed-forward/feed-back pump control for achieving a constant gain can be simulated for analyzing the amplifier performance. The simulation results indicate that the EDFA transient gain excursion caused by channel add-drop can be effectively suppressed by the combinational usage of electrical feed-forward and feed-back mechanisms. Our modelling approach is novel in the respect that the feed-forward/feed-back transient gain control is integrated with the EDFA dynamic simulation for the first time.

  Preview abstract

We have successfully demonstrated the possibility of implementing an integrated mode division multiplexer/de-multiplexer by utilizing an apodized 2D slanted grating coupler to multiplex/de-multiplex one fundamental (LP01) and one higher order (LP11) mode for each polarization between a few-mode fiber and the SOI chip. The whole device is composed of three parts: the 2D grating coupler, the tapered waveguides, and the MDM waveguide-type directional couplers. The design is optimized and manufactured by adopting the SOI thickness of 220nm with the 500nm top oxide and the 2 μm bottom oxide. Experimental results for proof of the concept are reported.

  Preview abstract

Orthogonal frequency-division multiplexing (OFDM) is commonly applied for visible light communication (VLC) to more efficiently use the limited bandwidth of a light emitting diode (LED). The operating point of the LED must be optimized to reduce the nonlinear distortion. We show that the optimal operating points are different for users at different regions. For a bit error rate (BER) criterion around 10^-3, the power penalty for users (respectively optimized) at the center and edge regions is much reduced. The optimal operating point for the edge users could be more tolerant to voltage errors and results in more uniform BER performance.

  Preview abstract

A method to fabricate novel liquid crystal fiber device is proposed by combining liquid crystals (LCs and hollow core fiber (HCF), in which a liquid crystal long period fiber grating (LC-LPFG) is fabricated using Surface Polymer Stabilized Alignment (SPSA) technique. Owing to the photo-polymerization conditions significantly influence the morphology of fiber grating structure, the influence of UV exposure time and curing voltage on the propertied of LC-fiber were studied. Based on the experimental results, we observed the threshold voltage and saturation voltage of LC-LPFG decreased with the increase of exposure time and curing voltage, respectively

  Preview abstract

The radiation efficiencies of enhanced coupling strength Gratings at first Bragg are calculated. The thicknesses of dielectric waveguides are increased to obtain accurate results of the radiation power.

  Preview abstract

We propose a broadband polarization beam splitter based on a decoupled symmetrical directional coupler. TM mode will be decoupled at finite separation between two symmetrical rib waveguide. This design is proposed to be implemented using TSRI IMEC-SiPh process technology. Numerical simulations show that the proposed PBS has a broad bandwidth (~100 nm) with large extinction ratio (> 13.5 dB).

  Preview abstract

Adiabaticity engineering in multi-parameter is applied to design an ultra-broadband silicon polarization independent 3-dB coupler. Adiabaticity engineering can shrinks the adiabatic device lengths, maintains the advantage of large bandwidth and results in the characteristic of polarization independence in the devices. The total length is 84 um and the device exhibit a bandwidth of over 300 nm.

  Preview abstract

In this study, a 3dB power splitter based on a shallow-ridge silicon nitride directional coupler structure is designed, and it exhibits a power splitter ratio that is insensitive to changes in waveguide width and coupling gap. The power splitter using a shallow-ridge waveguide structure exhibits a large fabrication tolerance and can achieve a power splitter ratio close to 1:1 at 1550 nm for TE polarized light.

  Preview abstract

The authors utilize the shift-or-shrink (SOS) algorithm to obtain the optimal structural parameters of microlens for maximizing the direct coupling efficiency from a single-mode fiber to an optical channel waveguide. The optimal structural parameters and the corresponding efficiencies are presented in this work.

  Preview abstract

A robust optical fiber network architecture for large-scale fiber sensor systems is proposed to remotely monitor the construction safety of buildings or bridges. Benefiting from a self-composed bidirectional device and proper optical routing function, the system manager not only can use each normal optical fiber pathway to deliver detection lightwaves to targeted sensors but also can use each other’s normal pathways as backup links to detect the targeted construction. The proposed fiber sensor network can provide proper self-healing function and simple network structure against one or multiple fiber link failures.

  Preview abstract

We employed the plane-wave expansion method to study the dielectric mirror as a semi-infinite two-dimensional photonic crystal in air. Light-line criterion for ambient incidence was applied in the calculations of the projected band structures and the restricted density of states. We further employed the equivalent refractive index model to obtain the angular band diagram which is in good agreement with the result obtained by transfer matrices.

  Preview abstract

Gold nanoparticles of size 60-200 nm are coated on a bilayer HfO2/Al2O3 dielectric thin film fabricated on a quartz substrate. Mode coupling between the localized surface plasmon resonance and cavity coupling enhanced by Fabry-Pérot interference are discussed. Full-color spectral tuning effects are verified with simulation based on a finite-difference time-domain calculation and with a home-built imaging spectral measurement system.

  Preview abstract

We derived the formula of the guiding power density to analyze the forbidden region of the local Kerr-type nonlinear slab left-handed metamaterial (LHM) optical waveguide structure. The numerical results show that the forbidden region always exits in the proposed optical waveguide structure.

  Preview abstract

In this paper, we propose and numerically investigate all-optical plasmonic filter based on nano-disk cavity structures. We used waveguides and filled with optical nonlinear materials nano-disk resonators to construct all-optical filter based on MIM waveguide structure. The dielectric constant of Kerr nonlinear medium in the resonator is changed by varying the pump light and the signal transmission can thus be controlled. The performance of the proposed all-optical filter was analyzed by the finite difference time domain (FDTD) method.

  Preview abstract

we propose an high efficiency polarization beam splitter with directional coupler based on subwavelength-grating waveguide and slot waveguide on a standard silicon-on-isolator platform. Assisted by a tapered subwavelength grating waveguide and a slot waveguide, the working bandwidth of the directional-coupler-based PBS covers the entire O-, E-, S-, C-, L- and U-bands and the coupling length is only 4.6 µm.

  Preview abstract

In this work, we propose a broadband silicon nitride polarization beam splitter. This polarization beam splitter that is based on asymmetric directional couplers exhibits a broadband operation with an extinction ratio of greater than 10 dB.

  Preview abstract

Nowadays, transition metal chalcogenides (TMCs) semiconductor materials have attracted a lot of attention in recent research due to their unique characteristics in photonics and electronics applications. Hydrothermal method synthetization technique for CuS and CuSe might contain high impurity while compare with other method. To obtain high crystallinity and purity crystal, we use chemical vapor transportation (CVT) as the synthesize technique. This paper presents the optical iridescence characteristics of CuS and CuSe. We observed two different types of μ-photoluminescence spectra for both crystals. Our analyses further discussed on grating effect which produce the white light and its separations.

  Preview abstract

We demonstrate fronthual links with delay-division-multiplexing 14-GHz bandwidth 64-QAM OFDM for 128 RF-chain signals. The corresponding CPRI-based capacity is 860.16 Gb/s.With I/Q Volterra nonlinear compensation, EVMs can be improved from 7.5% to 6%.

  Preview abstract

We propose a new scheme of multi-perimeter-zone fiber-optic intrusion detection system with Fabry-Perot interferometers used as disturbance sensors in a single fiber line. An outdoor test is carried out for a four-perimeter-zone system with an outcome of extremely high alarm rate upon intrusion, and a zero false alarm rate in the case of non-intrusion.

  Preview abstract

An underwater wireless optical communication (UWOC) system was proposed using a 450nm blue laser with 1.25 Gbps OOK modulation. The environmental effect, such as turbulence in different water densities, was measured at a 3-meter distance. The maximum BER that our system can reach in the 1.03 seawater density was 4.85x10-6 at -7.4 dBm. The water density can affect the system to obtain a higher BER floor, while turbulence affects the higher deviation in the BER performance.

  Preview abstract

We demonstrated a 1064 nm band semiconductor optical amplifier (SOA) based fiber ring laser in 1064 nm band. The combination of a high-power Ytterbium-doped fiber amplifier (YEDFA) is developed with the maximum output power of 2.033 W. The pulse repetition rate, optical signal to noise ratio, pulse energy and peak power are 181.81 kHz, 34 dB, 11.23 μJ and 11.12 W, respectively. The total output power reaches 1.269 W in 5A current. The 1064 nm fiber laser source is suitable for Raman sensing and medical treatment by using master oscillation power amplifier (MOPA) scheme to increase the optical power.

  Preview abstract