Session Index

We propose and demonstrate a indoor visible-light-communication (VLC) positioning and illumination system using triangulation method. Experimental results show that 85% of the measurements have position errors less than 6 cm.

 

We demonstrate a visible-light-communication (VLC) system using light-panel and moving mobile-phone CMOS camera Rx. We propose and demonstrate a segmentation extinction ratio enhancement (SERE) which can handle moving CMOS Rx. The operation principle will be discussed. Experiment results show the proposed SERE can significantly improve the bit-error-rate (BER).

 

This study investigates the generation of high-frequency microwave chaos using optically injected semiconductor lasers. The underlying mechanism relies solely on the nonlinear laser characteristics, and therefore only a typical semiconductor laser is necessary. Microwave chaos at 30 GHz with a broad bandwidth and a flat spectrum is obtained.

 

A 400 Gb/s/180 m PAM4 OWC system employing MZM- OEO BLS and doublet lenses is proposed. Analyticresults show that the data rate is markedly improved by PAM4 modulation and MZM-OEO BLS with multiple wavelengths, and the free-space transmission distance is considerably increased by a couple of doublet lenses.

 

We propose a method of adaptive compensation for angular deflection of beams carrying orbital angular momentum on mode sorting. Numerical results reveal that crosstalk is effectively suppressed by applying phase correction depending on the detected angular deflection onto the spatial light modulator.

 

We demonstrate a dual-wavelength erbium-doped-fiber (EDF) laser with compound-ring structure. Here, we use the fiber Bragg grating (FBG) and tunable bandpass filter (TBF) inside laser cavity to achieve selectable and stable dual-wavelength output. Moreover, the proposed compound-ring can produce the mode-filter effect to achieve stable single-longitudinal-mode (SLM) oscillation.

 

We designed high-speed circuit boards for 400 Gb/s single-mode transmitters with 25 Gb/s and 56 Gb/s per-channel data rates. Electro-absorption modulated lasers are used to provide high bandwidth. The circuit design for 25 Gb/s is verified both by simulation and experiments. The circuit design for 50Gb/s can have >30GHz bandwidth.

 

The properties of enhanced coupling strength liner structures are analyzed at first Bragg. A thin (~0.01μm), low-index (~1.5) liner layer over a surface grating structure (tooth height of 0.11μm) creates strong reflectivity.

 

A new method of resonant wavelength tuning of lithium niobate microdisk resonator by selective ZnO diffusion is presented. The Zn-diffusion on the microdisk rim not only tunes the resonant wavelength but also increases the optical damage threshold power. The resonant wavelength tuning rate by varying the annealing time is 0.18nm/hr.

 

We designed and fabricated optical filters in 1310-nm and 1550-nm wavelength bands using Mach-Zehnder interferometers through broadband couplers with splitting ratios of 0.5, 0.29 and 0.08. Python calculation shows that a 10-nm standard process deviation for 450-nm wide silicon wire could demonstrate 10-dB crosstalk with more than 90% probability.

 

We present a highly sensitive refractive index sensor based on an open-cavity fiber Fabry-Pérot interferometer. The open cavity is simply formed by splicing a HCF with a SMF with a pyramidal tip. A high refractive index sensing sensitivity of 1124.6 nm/RIU can be obtained.

 

Herein, 100-Gb/s (4×25 Gb/s) short-wave wavelength division multiplexing optical transmission module is designed and fabricated. In the module, the bit-error rate of the 25-Gb/s single channel is measured below 10-12 over 210 m multi-mode fiber transmission.

 

A 4-to-2 encoder based on self-collimated beams in two-dimensional photonic crystal is designed. The structure can generate a 2-bit binary code considering which input port is active. One waveguide bend and three power splitters are employed to realize the proposed encoder. And the device size is about 450 square micrometers.

 

A two-channel add drop filter based on two-dimensional photonic crystal ring resonators is proposed. Wavelength selectivity is provided by the 3x3 and the 3x4 quasi-square rings. Two wavelengths of 1504 nm and 1566 nm are dropped to port C and port D with 77% and 93% of transmission efficiency, respectively.

 

An optical fiber sensor based on a two-grating Fabry-Perot interferometer was constructed, and its capability in the electric-induced displacement measurement and temperature measurement was demonstrated. The achieved sensitivities of the displacement and temperature measurements were 53.3 pm/µm and 10.7 pm/°C, respectively.

 

An analysis method based on the mode expansions of sources is proposed for calculating transparency gain of leaky waveguides with hybrid III-V semiconductors. The approach is also a generalized eigenvalue problem.

 

The Ta2O5 microdisk resonators with high quality factor and low thermal wavelength drift are presented. The microdisk structure is produced by photolithography, magnetron sputtering, lift-off pattering, and under-cut etching. The 40μm-diameter Ta2O5 microdisk resonator has a high quality factor of 1.2×104 and a low thermal wavelength drift of 7.2×10-3 nm/ºC.

 

A bidirectional transmission system based on Passive Optical Network and Radio over fiber technology is proposed and demonstrated. In this paper, a local oscillator with 15GHz via first Mach-Zehnder modulator and 1.25-Gb/s data via second Mach-Zehnder modulator generate double sideband signal.