Session Index

An excellent semipolar (202 ̅1) 2*4 micro-LED array was fabricated through superior epitaxial technology and chip process. The quantum dot phosphor as a color-converter layer pumped by semipolar blue micro-LED array, realizing a white-light illumination with high color rendering and a high data rate for VLC.

 

We propose two designs and demonstrate by simulations using multiple half-spherical lenses with compound-parabolic-concentrators (CPCs) to enhance the field-of-view (FOV) of the visible-light-communication (VLC) receiver. Both proposed devices can provide a wide FOV > 60o with optical losses < 5.5 dB.

 

In this study, we have developed a high-speed swept-source optical coherence tomography (SS-OCT) imaging system using an electrically-pumped 1060-nm, MEMS tunable HCG-VCSEL. A movable high-contrast grating (HCG) is used as the top mirror of the laser cavity, replacing conventional DBR design. The SS-OCT system allows an A-scan rate of 500 kHz, a detection sensitivity of 98 dB, and an axial resolution of 22 µm. In addition, it could support high-speed volumetric imaging of the sample architectures and subsurface tissue microvasculatures. The MEMS tunable HCG-VCSEL could further facilitate OCT application with a more compact footprint and potentially a lower cost.

 

A bi-directional fiber-FSO-5G MMW/5G NR sub-THz convergence with intensity-modulated downlink 40-Gb/s/100-GHz 5G NR sub-THz signals (x- and y-polarizations), and phase-modulated uplink 10-Gb/s/28-GHz and 10-Gb/s/24-GHz 5G MMW signals is constructed, by adopting a parallel/orthogonally polarized dual-carrier mechanism, phase modulators, and remote injection locking DFB LDs for demonstration.

 

A 400-Gb/s WDM PAM4 OWC system through a 200-m free-space transmission with an 8.8-m/6.5-m piped/turbid water-air-water link is constructed. This demonstrated WDM-PAM4 OWC system outperforms existing OWC systems through free-space transmission with an air-water-air link because of its ability to resolve the practical engineering problems.

 

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A free-spectral-range insensitive silicon MZI design is proposed and experimentally demonstrated for the first time on silicon-on-insulator. The idea is to compensate for the group index change of silicon waveguide against manufacturing linewidth variability. Experiments reveal a ten-fold improvement in terms of FSR deviation against the fabrication error (7.6 GHz → 0.68 GHz) and a two-fold improvement in terms of the FSR slope (-0.0084/THz → -0.0036/THz), revealing the efficacy of the proposed MZI design.

 

We propose and demonstrate by simulation a compact silicon-photonics (SiPh) polarization splitter and rotator (PSR) by utilizing asymmetrical-directional-coupler (ADC) and adiabatic-step-waveguide-taper (ASWT). The whole device is < 90 μm and the polarization extinction ration is > 18 dB in 1540 nm - 1570 nm window.

 

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A new type of dual Mach-Zehnder interferometer (DMZI) scheme is presented for the first time without using any polarization control method to eliminate the polarization induced fading usually encountered in fiber-optic intrusion detection systems that use DMZIs. A new algorithm for positioning the intrusion-induced disturbance on the fiber is presented.



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A high-power, broadband, and high-extinction ratio polarization (TE/TM) super-luminescent diode (SLD) coupled to a Si waveguide through grating coupler has been demonstrated in silicon photonics. Using highly compressive-strain multiple quantum wells as active region, SLD waveguide integrated with a slanted reflection mirror was bonded on a silicon grating coupler, attaining 2mW output power and >15dB extinction ratio.

 

Cascaded electroabsorption modulators (EAM) integrated semiconductor optical amplifier (SOA) is demonstrated by quantum-well-intermixing technique. Cascaded high impedance transmission lines (HITL) are interconnected with segmental EAM for enhancing impedance match for the output loaded electrode, leading to 106Gb/s PAM 4, -3dB bandwidth of >60GHz and optical gain of >10dB.



 

A high-speed directly modulated DFB Laser integrated with SOA has been demonstrated. A 370μm long cavity of waveguide was fabricated, leading to 6mW optical power with continue-wave operation and 3dB bandwidth of 35GHz. A 50Gb/s non-return to zero eye pattern modulation has been achieved.

 

Traditional visible light communication (VLC) via light-emitting diodes (LEDs) employs the OOK (on-off keying) modulation scheme. Though optical frequency modulation has many advantages, it is hardly used for LED VLC due to the resistance-capacitance limit. By monolithically integrating a LED with an integrated digital transducer, we experimentally demonstrate the intermixing of gigahertz surface acoustic waves and electrical data signals in the LED cavity at room temperature. An optical transmitter was realized by in-situ frequency up-conversion of the data signals from a LED, which has the advantages of improving transmission performance by up-shifting the data spectrum away from low-frequency noise.

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We designed and manufactured a 2x64 optical phased array with apodized sub-wavelength gratings to provide uniform emission, and developed phase error correction (PEC) algorithm to suppress the speckles in the far-field pattern (FFP) caused by the fabrication induced fluctuations. The measured FFP after PEC calibration shows a divergence angle of 0.15° along the array direction with a peak-to-sidelobe level (PSLL) greater than 11 dB.

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A highly efficient harmonic microwave down-conversion scheme using semiconductor lasers at stable-locking dynamics is proposed and experimentally demonstrated. The proposed scheme provides a conversion gain of more than 10 dB over a frequency range of 2.5 GHz without phase noise deterioration.

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We demonstrated a 130-m non-flickering under-sampled-phase-shift-on-off keying (UPSOOK) visible light communication (VLC) using camera receiver. Experiments at different transmission distances and ISO values are also performed.

 

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This study investigates a lateral silicon GACC structure that allows efficient and alignment tolerant mode conversion between an active III-V waveguide and a-Si waveguide with a standard SOI platform, where the two group waveguides are bonded together with an adhesive material. By using the 3D-FDTD simulation, the coupling efficiency can be achieved up to 78.5% at 1550 nm with 20-nm wavelength bandwidth, respectively.

 

In this work, we demonstrated a LCs-loaded MZI optical switch based on silicon nitride waveguides. After applied a driving voltage, the light is switched from the cross port to the bar port over a broadband ranging from 1450 to 1650 nm.

 

We use multi-wavelength adiabaticity engineering in asymmetrical directional couplers to design a broadband silicon polarization splitter-rotator. A 141 um-long device exhibits excellent performance with >97% transmission and >16 dB extinction ratio over a bandwidth of 300nm.

 

We illustrate a design of silicon photonics (SiPh) zigzag structured metasurface mode converter from fundamental TE0 mode to first-order TE1 mode using genetic algorithm (GA). The device is compact with a high transmission of 85% at wavelength of 1550 nm.

 

We propose a novel method to mitigate the power fading effect in a V-band fiber-wireless 3x3 MIMO system. The proposed scheme can realize the 114.71-Gbps RoFMF system with 1.7-m FMF and 3-m wireless transmission.

 

A hybrid fiber sensing scheme is built by setting a Brillouin-optical-time-domain-analysis (BOTDA) fiber system and two Fiber Bragg gratings. The proposed system is capable of 16km sensing distance with a 2m spatial resolution. For FBGs parameters measurement, the measured sensitivity of 23pm/C and 0.975pm/με for temperature and strain individually.

 

A symmetrical polarization-division-multiplexing (PDM) wavelength-division-multiplexing passive optical network (WDM-PON) together with fiber to the extension link is designed. The investigated PDM WDM-PON architecture not only provides 35 Gbit/s downstream data traffic, but also avoids the Rayleigh backscattering (RB)-produced beat noise.

 

We investigate a wavelength-switchable quad-ring (QR) based erbium-doped fiber (EDF) laser to accomplish single-longitudinal-mode (SLM) exhibition. The presented QR can cause a mode-filter effect to mitigate the thick multi-longitudinal-mode (MLM), flatten power output and narrow wavelength linewidth over an obtainable tuning scale of 1524.0 to 1569.0 nm.

 

We propose to use a multi-ring architecture in erbium-doped fiber (EDF) based fiber to reach switchable wavelength and stable single-longitudinal-mode (SLM) behavior. Here, based on C-band erbium gain regarding as gain medium can extend the tuning scale from 1519.0 to 1577.0 nm. The related output characteristics are also executed.

 

We present an integrated path-encoded quantum optical controlled-NOT (CNOT) gate implemented on a Si3N4 photonics platform. The miniaturization of such a quantum logic gate on a chip is achieved by integrating reconfigurable Si3N4 Mach-Zehnder interferometer (MZIs), which replace bulk beam splitters that are commonly used on optical tables.

 

We propose a simple approach to modify the structure of hollow core antiresonant nodeless fiber (HC-ANF) by introducing connecting rods between the inner and the outer tubes of HC-ANF. Confinement loss of the modified HC-ANF with connecting rods can be lowered nearly one order of magnitude.

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In this paper, we tried the diameter of 9-35 μm chromium doped fiber (CDF) and combine the formula with parameters in MATLAB to find out the best gain vs length.

 

Design a Conductor-Backed Coplanar Waveguide (CBCPW) that can be used at 60 GHz,and made it in a drilled single layer glass structure,which can be use a drilled glass substrate to achieve the same signal in both side.S11 -10dB、S21 -3dB。

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We design a high-speed inductive-peaking Si microring modulator (MRM) which has a spiral inductor to enhance electro-optic conversion efficiency. Via properly selecting the operating wavelength, the MRM’s 3dB bandwidth extends from 45GHz to over 65GHz and the conversion gain increases by 5 dB at 50 GHz.

 

A high-efficiency polarization beam splitter is proposed by using three-waveguide coupler with subwavelength grating waveguide. The coupling length is only 12 μm, and the operation bandwidth is 53 nm. In addition, our proposed structure also possesses good fabrication tolerance.

 

We use MatLab to simulate the coupling efficiency between optical fiber and waveguide. Then, report and demonstrate the hyperboloid micro-lensed from Si-photonics chip coupling to single-mode fiber employing automatic grinding and calibrated spin-on-glass coating techniques

 

Recently, metalens has received significant attention because of its ability to control the light. In order to achieve mass production and high production yield rate, we develop an optical proximity correction simulation suite with fully convolutional network to enable the patterning of near-infrared metalens using the i-line photolithography. A 1.5mm metalens with a numerical aperture of 0.45 has been successfully fabricated with a measured efficiency over 50%, which is among the highest reported values using i-line photolithography.

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A low-power-consumption single-arm-driven silicon (Si) Mach-Zehnder modulator (MZM) operated at C-band (lambda=1550 nm) for non-return-to-zero on-off-keying (NRZ-OOK) transmission beyond 50 Gbit/s over 10-km single-mode fiber (SMF) and dispersion-shift fiber (DSF) is demonstrated to guarantee the IEEE 802.3bs standardized 400GBASE-FR8/LR8 operation.

data center, Si photonics, Mach-Zehnder Modulator (MZM), on-off keying (OOK), 4-level pulse amplitude modulation (PAM-4)

 

In this letter, we use SLM to make a single beam have multi-OAM to obtain complex optical vortices, and observe that complex optical vortices can produce different beam shapes. In addition, two different phase patterns can be superimposed for encoding and decoding.

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Phase error correction and optimization of Optical Phased array (OPA) is an important task in applying OPAs for optical sensing due to the fabrication induced phase errors among the arrayed waveguides that form unwanted side-lobes in the far-field pattern (FFP). Thus, an algorithm that is able to conduct phase distribution optimization is important to enhance the quality of FFP. In this research, we develop phase distribution optimization algorithm based on the genetic algorithm (GA) and performs PSLL of 15.58 for beam steering optimization. In terms of phase error correction, the algorithm can improve PSLL from 1.1 dB to 15.08 dB.

 

We propose a group phase correction to perform a far field phase calibration. A 64-channel uniform optical phased array (OPA) is successfully carried out with a periodic sidewall grating waveguide structure optical antenna. The far field after group phase correction indicates clean output beam with 0.16° FWHM along the array direction and 16.74 dB PSLL. We also exploit the genetic algorithm to design a 128-channel aperiodic OPA. The far field optimization performs 12.01 dB PSLL at 0π phase shift and 11.89 dB at π phase shift. The maximal steering angle can achieve ±52.7°.

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In this paper, we describe the realization of a high-speed communication system. Our approach uses Micro-LEDs for display system and uses light as communication media. In order to eliminate the local noise from environment in display system, we developed a coded pattern and applied our algorithm for information extraction.

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A WDM-VLLC and white-lighting ring network with 150-Gb/s accumulative transmission rate at CS, 50-Gb/s transmission rate at optical node, and 542-lux white-lighting at CS is demonstrated. RGB LDs with two-stage injection locking and optoelectronic feedback techniques are used to afford the dual-function of high-speed VLLC links with white-lighting at reading/writing-level.

 

This study developed a simulation framework to implement efficient quantum key distribution (QKD) . The software allows users to model and simulate arbitrary QKD systems. The results show that the software can handle the key rate of differential phase shift QKD protocol well and then the simulation is used for system optimization.

 

In this paper, the regular pulses generated by the pure optoelectronic feedback and
the hybrid system are demonstrated and compared in simulation. By applying optical injection
combined with the negative optoelectronics feedback system, the unwanted side peaks of the
regular pulses are effectively suppressed. Moreover, the detailed characteristics of the pulses
generated in different operational parameters are also discussed.

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The optical trapping of gold nanoclusters on a polystyrene bead include by the linear polarized Gaussian beam is studied. The 3D streamline of optical force shows the trapping behaviors on the frontside of the nanostructures. The Brownian-motion disturbance range shows the trapping ability of the stagnation point.

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A neural network pre-distorter without significantly altering the transmitted powers of subcarriers is proposed to eliminate nonlinear distortion in DML-based OFDM transmission. Without nonlinear post-compensation, the data rate is increased by 37.7% after 100-km SMF.

 

Due to the great demand on data transfer, silicon photonics is considered to be a platform to solve the encountered problems. But, Joule heating is serious along component size become miniature. Heat dissipation is an important issue need to be resolved. Because the circuit, electrical components and optoelectronic components are integrated on the Si photonics circuit, the demand for heat dissipation is higher than the previous Si one. The research integrated the heat dissipation module into the silicon photonic coherent transceiver. And, the research measured three cases for placed metal pad and TE cooler.

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We proposed a graphene-based high-contrast grating (HCG) structure by using the surface plasmon polaritons (SPPs) generated from transverse magnetic (TM) polarized emission. The newly-designed HCG comprises a silicon dioxide substrate and a periodic grating that is constructed of alternated layers of silicon and monolayer graphene. The pair of silicon/graphene features a large contrast in refractive index with its surroundings. Moreover, the permittivity of graphene can be modulated by adjusting the Fermi levels to further enhance the contrast.

 

A bound state in the continuum (BIC) is a non-radiative state. It perfectly confines an electromagnetic wave and can exist within a continuous spectrum. We proposed symmetry-protected BICs and Friedrich-Wintgen BICs on the periodic metallic grating to realize zero linewidth and infinite quality factor. Finally, we can change the filling factor to realize the optical cavity of a BIC laser featuring adjustable incident angles.

 

The color of silicon wafers varies with the growth of silicon dioxide with different thicknesses. In this study, we found that the color temperature and CIE color coordinates from a reflected light can be used to determine the thickness of silicon dioxide. At a tilt angle of 30°, for example, the bare wafer showed a color temperature of 5,290K, while 4,190K with a silicon dioxide of 200nm
and 4,990K with 500nm. In terms of CIE color coordinates, the respective coordinates were (0.337,0.345) for the bare wafer, while (0.373,0.372) for that with a silicon dioxide of 200nm and (0.345,0.352) for 500nm.

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In this article, through the polarized optical feedback system (POF) and the traditional optical feedback system (OF), the polarized optical feedback system is based on the traditional optical feedback system by adding an optical polarization system, so that the feedback light is polarized and interacts with the laser itself. The output light form polarized optical feedback system , effectively increasing bandwidth and narrowing the line width.Adjusting appropriate injection strength and delay time, the period one which 3-dB linewidth reduction to about 10-40 kHz are observed in polarized optical feedback system, and chaos states energy is more distributed on each frequency.

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We propose fronthaul link with 7-GHz IM-DD channels and 1/64 Nyquist-sampling-rate ADC to support 64 signals for 100-GHz Ma-MIMO beamforming. The corresponding CPRI-based capacity is 393.6374Gb/s. After fiber and wireless transmission, the EVMs are <8%.

 

In this paper, the regular pulses generated by the pure optoelectronic feedback and the hybrid system are demonstrated and compared experimentally. By applying optical injection combined with the optoelectronics feedback system, the unwanted side peaks of the regular pulses are effectively suppressed. Moreover, the single sideband (SSB) phase noise of the pulses generated is also discussed and compared.

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A main purpose of this system is to improve the operation of the light transmission in the international signal communication. This system with high-brightness, LED, image processing and human-machine interface is to reduce the power consumption on the ship, to achieve remote operation, intelligent track and identification of light signals. There will be no more necessary about signal received and translated operations in signalman during the communication process, thereby improving the shortcomings caused by human factors.



 

We present an avalanche photodetector integrated in ultra-thin Si-padded Si3N4 waveguide structure. This photodetector can monitor waveguide power with very small optical absorption.

 

We use a collimator to measure the radiation power of second order fiber Bragg gratings. The polar plots of the radiation for FBGs show that at wavelength of 1541.06 nm, we obtain a maximum radiated power of -26.6 dBm at the radiation angle of 90°, with a 2.8° beam divergence.

 

We report the simulation of simple-structured one-dimensional (1D) GMR gratings with non-polarizing resonance properties under normal incidence. The TE and TM resonance peaks are at different wavelengths, with a slight difference of 3.3 nm, as seen in the spectra of the GMR grating. After simulate Hfo2-coated with a thickness of 40nm that the grating nearly completely displays the nonpolarizing GMR effect.

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We design two directional couplers, one tapered and one cubically bent. Both couplers are adiabatic and show good robustness to wavelength changes and fabrication errors. We then further evaluate the device performances under different length and verify beam propagation simulations using coupled mode theory.

 

Dispersion relations of surface plasmon polaritons (SPPs) of various modes, propagating in a metallic nanowire, are studied analytically by solving a transcendental equation. The SPPs of higher-order modes carry orbital angular momentum. The surface plasmon resonances of a nanorod are induced by standing wave of two SPPs of mode 1 propagating in opposite direction at specific frequencies, excited by two pairs of electric crossed bi-dipoles.

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In this study, we successfully fabricate a high-speed of the guard-ring-free planar InAlAs avalanche photodiode (APD). The surface is treated with a thick SiO2 dielectric layer to reduce surface leakage current, the capacitance value down to 0.18 pF, and increase the speed of response. In terms of eye diagrams, this is a clear indication at a bit rate of 12.5 Gb/s. It means that it is operable beyond 10 Gb/s and ideally suited to OC-192 optical fiber communication applications. We obtained a maximum f3dB of 10.96 GHz and the gain-bandwidth product of 95 GHz.

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This work proposes the technique of optical shaping to reduce the required analog bandwidth of low-sampling-rate digital-to-analog converter (DAC) in the ONUs of a delay-division-multiplexing (DDM) OFDM PON. The ONUs successfully employ a low-bandwidth (3.75 GHz) and sub-Nyquist-sampling (7.5 GS/s; one-half of the Nyquist rate) DAC to transmit the 7.5-GHz 16-QAM OFDM data to the central office.

 

In this paper, we demonstrate a silicon ring resonator with OAM emission by adding silica holes along the centers of ring resonator.

 

We first demonstrate a fiber- and free space optical (FSO)-based wavelength-division-multiplexing passive optical network (TWDM-PON) with star-ring architecture to achieve the self-protected operation against fiber fault. The presented PON accomplishes bidirectional 40 Gbps downstream and 10 Gbps upstream transmissions through 50 km fiber and a 2 m FSO connections.

 

The spectrum and extinction ratio analysis of a 2×2 grating coupler directional waveguide with asymmetric Mach-Zehnder interferometers for wave division multiplexing are demonstrated. The targeting wavelength is around 1330 nm, and the extinction ratio is up to 10.97 dB at 1328 nm.

 

We numerically model the waveguide-to-cavity coupling with a nano-taper. By optimizing the tapered width, high efficient coupling can be achieved with an enhancement up to 100% without further minimizing the coupling gap and elongating the coupling length. This nano-taper design provides the flexibility in coupling for the potential applications in nonlinear and quantum photonics, especially requiring over-coupling.

 

In this study, a polarization splitter rotator (PSR) element was designed using Si3N4 material. When the input light is TE0, the light penetrates directly to the output. When the input becomes TM0, the TM0 mode is converted to TE1 mode by taper because of the strong TM0-TE1 hybridization and then TE1 is converted TE0 mode by an asymmetric directional coupler. Therefore, such an element can convert unpolarized light into 100% TE wave with good transmission efficiency in the C-band.

 

We demonstrate a tactical grade interferometric fiber optics gyroscope based on silicon photonics platform. As-realized silicon chip integrates all passive and active components on the same chip while leaving the light source and fiber coil externally. The proposed Si IFOG is a promising alternative to LiNbO3 and MEMS counterparts with a miniaturized footprint and better cost/performance value.

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We develop an optoelectrical NOR gate without resistors, using Light-Emitting Transistors (LET) on GaAs substrate by the monolithically integrated fabrication. By dual-input and dual-output (electrical and optical) characteristics, it can be applied to Opto-Electrical Integrated Circuits (OEICs).

 

A digital auxiliary interferometer is proposed to correct the laser non-linear frequency sweep phenomenon by resampling the signal through a Hilbert-Transform phase-detection method. The resampling capability from a digital Hilbert-Transform auxiliary interferometers demonstrate its superiority to conventional analog Zero-crossing on two different optical-path-delay lengths.