Session Index

A Si carrier-depleted ring modulator on a Si-on-insulator (SOI) has been shown. Small diameter of 15μm was designed in the Si ring, leading to low capacitance and thus high-speed modulation. 40Gb/s open eye with above 4dB extinction ratio through 3.8 Vp-p has been found.

 

Au metasurfaces arrayed on a SiO2 waveguide proposed as an optical filter. The influence of the geometry size of the end-fire waveguide filter on the transmission performance is studied. The filtering properties that can be modified by tailing the coupling strength between surface-plasma resonance and guide-mode resonance.

 

We propose and demonstrate an angle-of-arrival (AOA) visible-light-positioning (VLP) system. Two-vertical-cardboards of known height are put in the quadrant solar cells to produce shadows affecting the received light; hence the locations can be estimated.

 

We propose and demonstrate a VLC using smart-phone CMOS image sensor and LED display panel. Experimental results show that the proposed 4-bit frequency-shift-keying (FSK) VLC system has a success-rate >70% at transmission of 100-cm.

 

We study a modified Euler-bend for the mode-division-multiplexed (MDM) multimode-waveguide bends to reduce the inter-mode crosstalk. Results show that at very small bend of radius 15 μm, Euler-bend has the minimum mode-maintaining-efficiency of >85%.

 

We demonstrate using anelectro-absorption modulation laser (EML) which is optimized for 10 Gbit/s network for a 40-Gbit/s radio-access-network (RAN) supporting free-space optical (FSO) mobile mid-haul and fiber mobile front-haul transmissions.

 

This study investigates generation and modulation of high-frequency microwave carriers based on period-one nonlinear dynamics of optically injected semiconductor lasers. Data are added onto microwave carriers through direct modulation of the optically injected semiconductor lasers for broadband wireless communication.

 

An electric field sensor based on a fiber Bragg grating (FBG) to be fixed on a piezoelectric material is proposed in the research. The piezoelectric material is affected by the electric field to produce a deformed force to pull grating for generating the Bragg wavelength shift.

 

This work demonstrates a tunable 1x2 multi-mode interference power splitter incorporating liquid crystals as a cladding layer. By breaking symmetry of multimode region, an arbitrary splitting ratio can be achieved. Liquid crystal serves as tunable refractive index materials to slightly tune or trim the splitting ratio of the power splitter.

 

Non-linear root searching methods are used to obtain propagation constants and corresponding field distribution of optical layered structures.These procedures rely on good estimate of root locations to succeed.We present a linear eigenvalue-eigenvector formulation based on FD-FD for computing mode field solutions without the complexity of non-linear techniques

 

We report characteristics of eight-channel demultiplexers designed on the silicon-on-insulator platform and fabricated by multi-project-wafer services. The fabrication error on the subwavelength gratings is found to change the channel wavelength and spacing of the filter bands. Simulation by using the measured grating shape can better match with the measured results.

 

We demonstrate violet laser diode point-to-point 64-QAM-OFDM transmission beyond 25-Gbps and eye-hazard-free white-lighting 16-QAM-OFDM communication at 10-Gbps over 0.5-m with phosphor diffuser based color conversion.

 

We propose a 6.4 Gbit/s on-off-keying (OOK) modulations visible light communication (VLC) system using 2x1 polarization multiplexed 682 nm vertical-cavity-surface-emitting laser (VCSEL) with signal security after 5 m free space transmission. We also analyze the signal security of polarization-demultiplexed VLC wavelengths to meet the forward error correction (FEC) target.

 

Single-sideband-filtered detection is employed to decode the 26-GHz millimeter-wave carried QAM-OFDM converted from dual-mode laser diode transmitter, providing long-reach MMWoF link to enable 8-QAM-OFDM transmission over 100-km SMF and 10-m wireless access.

 

Hybrid dielectric-plasmonic waveguide couplers based on SU-8 polymer on a silicon substrate are proposed. Ridge-shaped dielectric
waveguide and symmetric polymer claddings embedded with thin gold stripes as plamonic wavguides are utilized. Polarization-dependent single-guiding mode profiles of the waveguide coupler are measured. The experimental results are in accordance with theoretical prediction.

 

We design 4×4 polarization-color-multiplexing approach to achieve the high-speed GaN LED visible light communication (VLC) traffic. In the measurement, the presented VLC communication achieves the 1.7 to 2.3 Gbit/s on-off keying (OOK) modulations over the wireless free space link of 1 to 4 m for indoor data access.

 

A pseudo avalanche photodiode (APD) equivalent-circuit was proposed on single-photon detection system using a balance-dual-APDs Geiger-mode self-differencing scheme. Impressive results in low dark-count rate (f 8.87×105), high single-photon detection-efficiency (17.89 %), and low after-pulsing (<10%) were obtained under operation of -20ºC, excess biasing of 1.8V, and gated-frequency of 10 MHz.

 

We demonstrate a bidirectional >67 Gbit/s orthogonal frequency division multiplexing (OFDM) wavelength-division-multiplexing passive optical network (WDM-PON) scheme without any Rayleigh backscattering (RB) noise interference. Here, in view of out designed bit-loading OFDM algorithm, the power fading and chromatic dispersion can be enhanced after 20 km fiber link.

 

A bilayer silicon nitride and silicon photonic platform is proposed. By incorporating a vertical adiabatic taper coupler, 3D photonic integrated circuits can be implemented.

 

Optical shaping is proposed to avoid the required analog bandwidth (BW) of low-sampling-rate A/D conversion in a DDM-OFDM-PON. It successfully enabled the detection of 7.5-GHz/28-Gb/s downstream using low-BW (1.7 GHz) and sub-Nyquist-sampling (3.75 GS/s) A/D conversion.

 

All-optical wavelength converted phase shift keying in SiCO micro-ring waveguide with Q-factor of 11000 is demonstrated to achieve 10-Gbps PSK data conversion with SNR of >6 dB, ER of >12 dB, and BER of <2×10-5.

 

We present an electro-optically-tunable microdisk resonator with high dual-polarization tuning efficiency. The designed transparent electrodes effectively increases the overlap integral between the optical field and the electric field for TE and TM polarizations. The electro-optic tuning rates for TE and TM modes are as high as 19.23pm/V and 15.25pm/V.

 

The driver IC for 25-Gbaud/s PAM-4 modulation is designed and fabricated with GaAs foundry service to encode 50-Gb/s data on electroabsorption-modulated lasers (EMLs). The tuning of PAM-4 signal levels is designed to overcome the nonlinear modulation curves of EMLs. The measured results indicate the feasibility of the circuit design.

 

For a semiconductor laser cavity, the lowest transparency gain
among waveguide (WG) modes can be favored; thus, only one mode can
survive in the WG, and it is in the region with the specified BOX
thickness. Finally, we proposed a credible mechanism suitable for
demonstrating the region requirements of the existence of the
Surface-Plasmon-Polariton modes.

 

We propose a high fabrication tolerance and broadband silicon polarization beam splitter by point-symmetric cascaded 3-dB fast quasiadiabatic couplers for TM0 mode. The 3-dB coupler is made invisible to TE0 mode due to large difference in adiabaticity parameters, and the bandwidth and fabrication tolerance are enhanced by cascading point-symmetric devices.

 

A pressure sensor based on an open-cavity fiber Fabry-Pérot interferometer (FPI) is proposed. The open cavity is formed by sandwiching a short section of HCF between a double-beveled SMF and a commercial SMF. A pressure sensing sensitivity of 28.22 pm/psi can be obtained.

 

We propose a novel polarization beam splitter based on decoupling control which is consisted of two symmetric rib waveguides. The design is proposed to be implemented using TSRI IMEC-SiPh process technology. The proposed PBS has a broad bandwidth (~100 nm) for a good ER of >10 dB.

 

We successfully design a subwavelength apodized one-dimensional grating coupler which consists of 70nm shallow etch and 160nm poly-silicon overlay for light coupling between the 220nm silicon-on-insulator (SOI) waveguide and the optical fiber. High coupling efficiency （67%）with 1dB bandwidth of 43nm is achievable by simulation.

 

We demonstrate two design concepts to implement narrowband transmission filter based on waveguide gratings. Experimental results reveal that employing waveguide gratings in a Michelson interferometer is a much practical approach, as compared to Sagnac counterpart, due to its shorter and relatively balanced connecting waveguides.

 

In this study, the microwave signals generated by semiconductor lasers subject to optical injection and optoelectronic feedback (OEFB) are investigated experimentally. By applying the OEFB loop to the semiconductor laser subjected to optical injection, the magnitudes of the microwave signals are enhanced and the spectral noise is suppressed.