Session Index

The authors derive a formula of computing the direct coupling efficiency from a laser diode to a diffused channel waveguide. Then we utilize a very simple optimization method (shift-or-shrink algorithm) to obtain the optimal coupling conditions. Several cases of the channel waveguides are presented.

 

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 optoelectronic feedback system, the unwanted side peaks of the regular pulses are effectively suppressed. Moreover, the linewidths are also discussed and calculated.

 

A Mach-Zehnder interferometer (MZI) sensor, which is constructed by a hollow-core fiber spliced between single mode fibers and functionalized with chitosan/poly(acrylic acid) self-assembled layers for monitoring heavy metal ion copper (II), is proposed and experimentally demonstrated.

 

A camera based positioning system is studied. The centroid method in combined with target ring markers is applied to reduce the probability of incorrectly identifying non-existing users. 95% positioning accuracy of 0.89 cm and user identification error with only 0.03 times of the case applying LED spot marker is demonstrated.

 

This design of a conducted-backed coplanar waveguide (CBCPW) is used for 60 GHz bandwidth. The CBCPW device is achieved on a single-layer drilled glass structure to obtain the transmission line of the insertion loss S21 of -0.69dB and the reflection loss S11 of -27.76dB.

 

We propose a terahertz (THz) polarization maintaining fiber which has a negative curvature structure and is geometrically asymmetric. Numerical results demonstrate that the birefringence of the proposed fiber will increase with the diameter of the inner nest.

 

We numerically study the influence of thermal effect on the leakage channel fibers. It is found that the mode area will be reduced when the heat load is considered. Moreover, the mode area is smaller when the leakage channel fiber has a larger air-hole diameter.

 

Employing high launch power and Volterra-based pre-distortion to combat severe fading, loss and nonlinear distortion, we demonstrate a 52-Gbps 60-km LR-PON of 30-dB loss budget without inline or pre-amplifier and digital compensation for nonlinear distortion at ONUs.

 

Here we proposed a low-frequency AC magnetic field sensor based on FBG with a magnet. When the sensor is at presence of an external magnetic field, the magnet attached polymer causes shift of the FBG reflection wavelength. Our design is affordable and compact, which is suitable for wide electronic applications.

 

The microdisk resonator made of two oxide materials with positive and negative thermo-optic coefficients is presented with high thermal stability of resonant wavelength. The study upon the dependence of thermal drift rate on the thickness combination shows that the optimal thermal drift rate can be as low as 0.26 pm/ºC.

 

This topic mainly uses the theory of dual-concentric core fiber, and the characteristics of index-guiding photonic crystal fiber to design, in which light can pass through the refractive index difference of the medium, and the fiber Structural modification to design a dispersion compensation fiber with ultra-high negative dispersion.

 

Terahertz surface resonant waves are generated on metal-coated plastic woven meshes with strong field confinement within the periodically corrugated surfaces. The transmission spectral dips can sensitively be responded to optical constants of samples. The measured detection limits of refractive index and thickness are respectively 0.013 RIU and lambda/653.

 

A novel fiber-optic pH sensor based on a unique double-tapered Mach-Zehnder interferometer with multiple bilayers of chitosan and poly(acrylic acid) is proposed. pH responsive chitosan hydrogel coating on the fiber swells/deswells in response to local pH, inducing refractive index changes and then shifting of interference dips in the optical spectrum.

 

Ultra-broadband long-period fiber grating with higher-order mode conversion bandwidth larger than 150 nm is demonstrated, which has been combined with a tunable ytterbium-doped fiber laser to generate optical doughnut beams in the spectral range from 1030.0 nm to 1098.7 nm, and the vector nature of generated optical fields are observed.

 

The C-band tunable wavelength of erbium-doped fiber laser was constructed by a tunable optical filter in the ring resonator. The low and high coupling ratios in the resonator were found to have a large gain corresponding with the short and long wavelength of the C-band, respectively.

 

Controlling of the different coupling ratios in the circular ring resonator of erbium-doped fiber laser, the nine tunable wavelengths from 1558.900 to 1565.500 nm and the corresponding peak optical powers varied less than 1 dB compared with the average optical power of -13.36 dBm were obtained in this experiment.

 

This research is based on wireless OWIPT system of resonant beam, using wireless optical communication technology to enable signal and power transfer in free space at the same time. After the resonance effect is achieved, and DC and AC signals are separated to achieve power and signal transfer.

 

A propose and demonstrate by simulation a compact mode-converter between TE0 and TE1 by utilizing subwavelength-grating-assisted (SWG) asymmetric-directional-coupler (ADC). Results show that the coupling-length can be reduced by 40%.

 

This study proposes a fiber direct-current voltage sensor by means of combining a fiber Bragg grating and piezoelectric transistor. The sensor can be used to detect the DC voltage in the range from 0 to 180 volts.

 

This search is to investigate the tuning grating-bandwidth by applying different tension forces in a TFBG. The tension force from 0.02 to 0.1kgw is applied in five different fiber diameters from 80 to 40μm. In addition, the thermal influence of grating bandwidth from 40°C to 100°C is also investigated.

 

A hybrid tree and multi–ring radio over fiber transport system is proposed and experimentally demonstrated. With the assistance of a self-composed single-line bidirectional optical add/drop multiplexer and flexible network structure, the transport system can maintain network traffics when multiple fiber link failures occurred.

 

We propose and experimentally demonstrate a MIMO-MMW-RoF mobile fronthaul with a polarization insensitive RU design. In the same fronthaul infrastructure, a flexible capacity management can be achieved with two software-level controlled signal stream scenarios.

 

We proposed and demonstrated an optical-camera-communication (OCC) employing logistic-regression and data-preprocessing. Experimental result shows that the proposed scheme can improve the bit-error-rate (BER) performance significantly.