Ailun Ye

Measuring electro-optic coefficients of poled polymers using fiber-optic Mach¿Zehnder interferometer

It is proposed and demonstrated that fiber-optic Mach–Zehnder interferometer measures accurately electro-optic coefficients of, not only poled polymer thin films, but also poled polymer waveguides. Furthermore, the tensor components, both r13 and r33, of electro-optic coefficient can be measured simultaneously.

Simultaneous measurement of various optical parameters in a multilayer optical waveguide by a Michelson precision reflectometer

A novel reflectometer based on Michelson interference is proposed and used to measure various optical parameters of homogeneous multilayer optical waveguides. Refractive indices, thickness, insertion loss, absorbed loss, Fresnel reflectance, and diffuse reflection coefficients of optical waveguides can be measured simultaneously.

Digitally tunable optical filter based on DWDM thin film filters and semiconductor optical amplifiers

We demonstrate a novel digitally tunable optical filter, which is based on dense wavelength division multiplexed (DWDM) thin film filters and semiconductor optical amplifiers (SOA). It has the advantages of fast tuning speed, large tuning range, good temperature stability, simple control mechanism. It is also scalable without bringing additional insertion loss. The passband wavelengths are in consistency with those suggested by ITUT.

EFFECTS OF THE BIAS-CONTROLLED GRID ON PERFORMANCES OF THE CORONA POLING SYSTEM FOR ELECTRO-OPTIC POLYMERS

The corona poling system for electro-optic polymers with a bias-controlled grid is experimentally studied. The relationship between the corona threshold voltage and the grid bias voltage is researched. There is a minimum in the corona threshold voltage versus grid bias voltage curve. Effects of the grid bias voltage, the mesh size and the grid electrode position on performances of the poling system are discussed and analyzed. The experimental results show that the grid electrode can enlarge the corona discharge dynamic range and control the poling current in a wide range, grid electrodes with different mesh sizes and grid-plate gaps have different effects on performances of the poling system, and the grid electrode should be near the plate electrode to acquire stable corona discharge.

Directivity of the Magnetostrictive Fiber-Optic Interferometric Transducers

Directivity in magnetostrictive fiber-optic interferometric transducers was analyzed. Comparison was carried out theoretically and experimentally on cylindrical and racetrack transducers, and expressions were presented. The results show that the racetrack transducer has better performance both in sensitivity and directivity for it has a length of magnetostrictive strip in parallel to the measured field

Reconfigurable wavelength-routing all-optical network testbed

This paper presents the test results in the initial phase that we are constructing a self-healing all-optical network testbed, which is called SHAONET. The completed testbed will be used to demonstrate broadband applications based on wavelength routing + WDM + SDH + ATM and Ethernet transport of multimedia signals from multimedia terminal and video server. The design, implementation and performance of the testbed are discussed.

Fast tunable electro-optic polymer waveguide gratings

A novel fast tunable electro-optic (EO) polymer waveguide grating is proposed and designed. Its resonant wavelength can be linearly tuned by first-order EO effect with a high sensitivity of 6.1pm/V. Its spectrum characteristics depend strongly on many grating parameters, such as refractive index modulation, modulation function, grating period and period number. Material selection, fabrication technology, EO tuning ability and polarization dependence of EO polymer waveguide grating are also discussed. This waveguide grating not only overcomes the shortages of optic fiber gratings, such as slow wavelength tuning ability, and large-scale integration inconveniency, but has many advantages, such as high resonant wavelength tune sensitivity, same fabrication technology as semiconductor, and polarization independence.

A novel configuration for the transducer of magnetostrictive fiber-optic interferometric sensors

A novel configuration for the transducer of magnetostrictive fiber-optic sensors was proposed and implemented. It is composed of a rectangle and two half-circles. The transducer with the novel configuration has not only higher sensitivity than that of traditional configurations, but good directivity. The magnetostriction was analyzed compared with that of cylindrical transducers. It is shown that the system sensitivity can be improved by increasing the long-side of rectangle and shortening the perimeters of the two half-circles. Two transducers with cylindrical and racetrack configurations were fabricated. Moreover, an experimental setup to measure the low-intensity magnetic field detection responses was built up. Experimental results verified the analysis. For its good directivity, three of them can be compounded as a vector magnetometer to measure three orthogonal components of magnetic field.

Electro-optic polymer waveguide grating with fast tuning capability.

A novel fast tunable electro-optic (EO) polymer waveguide grating is proposed and designed. Its resonant wavelength can be linearly tuned via the first-order EO effect with a high sensitivity of 6.1 pm/V. We find that the spectrum characteristics of EO polymer waveguide gratings depend strongly on many grating parameters, such as refractive-index modulation, modulation function, grating period, and period number. Material selection, fabrication technology, EO tuning ability, and polarization dependence of EO polymer waveguide gratings are also discussed. Such a waveguide grating not only overcomes the disadvantages of fiber-optic gratings, such as slow wavelength tuning ability and large-scale integration inconvenience, but also has many advantages, such as high resonant-wavelength tuning sensitivity, the same fabrication technology used for semiconductors, and polarization independence.

The experimental optical burst switching system

The first optical burst switching (OBS) system has been demonstrated in China, which includes three edge routers and one core-node. A kind of fast wavelength selective optical switching was used in the system. The core OBS node consists of a kind of wavelength selective optical switch we developed. It consists of two SOA switches and one wavelength selective thin film filter with centre wavelength at one wavelength. There are one input optical fiber and two output fibers, each fiber carries two wavelengths. The Dell PE2650 servers act as the edge OBS routers. The wavelength of each data channel is located in C-band and the bit rate is at 1.25Gbps. The control channel uses bit rate of 100Mbps at wavelength of 1310 nm. A novel effective scheme for Just-In-Time (JIT) protocol was proposed and implemented. OBS services, such as Video on Demand (VOD) and file transfer protocol (FTP), have been demonstrated. Assembling and scheduling methods that are capable to guarantee the QoS (quality of service) of the transported service are studied.