Session Index

Abstract: We report an 850 nm oxide-confined VCSEL which achieved 54 Gb/s error free data transmission with a -3dB bandwidth of 29 GHz at room temperature without the use of equalization, pre-emphasis, and forward error correction.

 

We design an all-optical neural networks using the nano-optic components with the silicon photonics design rules of IMEC. The architecture is based on the reservoir computing. The result showed that the reservoir computing system using nano-optics can recognize the input signals.

 

We propose a novel fiber hydrophone based on the Bragg fiber grating by using a special design structure for obtaining a nice sensitivity.

 

A biosensor based on an Mach-Zehnder interferometer (MZI) fiber for real-time identification of glutaraldehyde (GA) solution is reported. The MZI was constructed by splicing a section of hollow core fiber between two standard single-mode fibers. We find the spectrum shifts induced by the molecular interaction can be easily monitored.

 

The main goal of our research is to combine carrier aggregation technology with hybrid digital and analog beamforming architecture to provide an excellent system performance with less penalty. This paper proposes a hybrid precoding algorithm to support two carriers aggregated that are based on this scenario.

 

A polarization-tunable linear polarizer is demonstrated using a guided-mode resonant (GMR) filter combining a liquid crystal (LC) polarization rotator. This polarization rotator can manipulate the linearly polarized light generated by the GMR filter, thereby enabling the generation of the linearly polarized light with an arbitrary direction of the polarization axis.

 

A single-line bidirectional optical add/drop multiplexer is developed and employed to compose a radio over fiber transport system with self-healing functionality which can easily heal blocked network connections by adjusting the operation status of a preinstalled optical switch in a central office.

 

An accelerometer with the fiber grating encapsulated in two plastic hallo cylinders was proposed. A thin film with a metal plate was placed between the cylinders. When the metal plate moved in response to the acceleration to cause the central wavelength shifted, the accelerometer could accurately measure the vibration frequency.

 

Fiber lasers with intracavity birefringence are designed by analytically solving the coupled complex Ginzburg-Landau equations. Bright and dark solitons are bound to form picosecond vector solitons. The laser parameters, including pulsewidth, chirping, and intracavity birefringence, can be derived from the coefficients of fibers, optical gain, filter bandwidth, and cavity arrangements.

 

In this paper, the authors utilize the finite-difference time-domain (FDTD) simulation to study the tolerances of the hybrid T-junction waveguide with different imperfections. The degraded performances due to the defective dielectric cylinders with different heights in different positions are investigated.

 

The propagation characteristics of negative curvature hollow-core fiber by measurement are presented. The beam profiler, infrared camera, and optical spectrum analyzer have using to show the power distribution in the hollow-core of the fiber.

 

Polarization beam splitting for self-collimation beams is realized by square lattice photonic crystal with triangular air holes. Angular orientation and size of the triangular air holes on isofrequency contours are studied. Transverse magnetic and transverse electric polarizations are separated by tilted self-collimation effect in a 100 um long photonic crystal.

 

Mixed gold nanoparticles of diameters 70nm and 100nm are detected simultaneously for their extinction spectra under an imaging spectroscopic system built with a white light interferometer and a waveguide mode excitation scheme. The detected spectra fit well with that meatured by a conventional dark-field microscope and theoretical prediction.

 

In this thesis, we fabricate and characterize ×4 coarse wavelength division multiplexing (CWDM) [1] modules based on thin film filters (TFFs). The insertion losses of the channels centered at 1271nm、1291nm、1311nm, and 1331nm are 1.14dB, 2.38dB, 3.77dB, and 4.89dB, respectively.

 

We used E-beam Evaporation Process Ta2O5 micro-ring resonator waveguide measurement to analyze its spectral and characteristic properties. By using the results of modal analysis, we can further analyze the quality factor of the ring resonator. For nonlinear characteristic detection, We use all-optical modulation with calculations to get the parameters.

 

A vibration sensor based on a hollow core fiber (HCF) is proposed. High signal-to-noise ratio (SNR) is obtained at different vibration frequencies by different sensing structures. Experimental results show that smaller core diameter of HCF can have wider measurement ranges with vibration frequency from 0.1 Hz to 10 kHz.

 

Dual-concentric core photonic crystal fibers (DCC-PCF) were a kind of dispersion compensating fiber with ultrahigh negative dispersion. However, an undesirable “modal squeeze” effect causes difficulty in achieving a single-mode operation in a DCCPCF. This paper designs a DCCPCF for avoiding the modal squeeze and operating in single mode.

 

A low-loss broadband 1x3 power divider is designed in two-dimensional triangular photonic crystal. First, two drop rods are employed to achieve broadband equal-power splitting. Second, three defect rods are used to reduce power reflection. The proposed power divider exhibits a low-loss bandwidth of 78 nm around 1550 nm wavelength.

 

A combination grating, consisting of two sub-gratings (Λ1=0.4Λ and Λ2=0.6Λ) are simulated. The properties near the second-order of the combined grating are found to be similar to those of conventional gratings.

 

We demonstrate a double-etched silicon nitride grating couplers on a silicon-on-insulator substrate at the wavelengths around 850 nm and 1550 nm for the application in optical communication and Lidar.

 

The finite element method is formulated to solve the scalar weakly guiding wave equation in a circular cross-sectional optical fiber. The matrix elements of the differential equation can be obtained by the natural coordinate system in a discretized triangular system.

 

The single-wavelength can be obtained by the Fabry-Perot laser diode with direct and external cavity filtering techniques. The peak power of the external cavity filtering wavelengths has an average value of -21 dBm. The side mode suppression ratio > 30 dB will be easily obtained by the external cavity filtering.

 

We derive an exact solution of BPM one-way equation under plane wave analysis. We then compute, using Fast Fourier Transformation (FFT), exact and BPM solutions of both divergent and convergent Gaussian beam with a beam width of two wavelengths.

 

We propose a bidirectional radio-over-fiber passive optical network system that can increase spectral efficiency and approach duplex communication. The proposed bidirectional transport system can reduce Rayleigh backscattering interference as well as offer increased transport distances and system performances.

 

In this paper, we discussed the properties of silicon photonic all-optical filters and
analyze the silicon-on-insulator (SOI) waveguide structures. Then we use various micro-cavities to
design all-optical devices. First, we use the triangle-teeth-shaped micro-resonators to design silicon
photonic all-optical filters.

 

In this paper, we propose and numerically investigate the all-optical filter based on the metal-insulator-metal (MIM) plasmonic nonlinear nano-ring cavity resonator structure. The performance of the proposed all-optical filter was analyzed and simulated by the finite difference time domain (FDTD) method.

 

An all-optical half subtractor in two-dimensional photonic crystal is proposed. This device is designed by cascaded power dividers and by the principle of interference. Operating wavelength is 1550 nm and the contrast ratio is 4.36 dB. The overall size of half subtractor is about 14 um x 16 um.

 

Optical limitations are important for high-speed components. Oxidized VCSELs use oxidation to control the aperture, thereby controlling the shape of the light for high-speed transmission.