We propose a new type of optical fiber called homogeneous multi-core fiber (MCF) to drastically increase the transmission capacity of single fiber using the mode-division multiplexing. In this MCF, identical cores are closely arranged so that the cores are strongly coupled to each other to form coupled modes, each of which corresponds to a transmission channel. A novel mode multi/demultiplexer ...

We used multiple optical wavelengths to study ultrasound-modulated optical tomography (UOT) in tissue phantoms. By using intense acoustic bursts and a CCD camera-based speckle contrast detection technique, we observed variations of the ultrasound-modulated signal at various optical absorptions. The experimental variations were found to be highly correlated with predictions from Monte Carlo simu...

In this paper, we will discuss the network architectures and the enabling technologies to realize a robust multi-wavelength optical access network. Various network topologies employing the dense WDM or coarse WDM technique; as well as several network enabling technologies such as data re-modulation technique, fiber link protection and traffic restoration, etc. will be described. Besides, some f...

Multi-section semiconductor optical amplifiers (SOA) have been shown to have superior noise and linearity performance compared with single section SOAs. We show how to create a simplified numerical model for multi-section SOAs that is suitable for optical communication system simulations and use that model to investigate the amplification performance of 56 Gbit/s four-level pulse amplitude modu...

Research Project of Optical Information Technology at ETL under RWC program is given in detail. In this program, firstly, so called CAD (computer-aided design) system for optical devices will be established for the purpose of acceleration on the development of semiconductor optical devices. Devices developed under the CAD system will be implemented into new types of optical information systems ...

Introduction : Multi-modality imaging is becoming a trend in developing new generation in vivo imaging techniques for diagnosis [1]. Recently, our group has developed a high temporal resolution, dynamic MRI-DOT multi-modality imaging system [2]. Dynamic contrast enhanced MRI (DCEMRI) has been proven to be the most sensitive modality in detecting breast lesions [3]. However, it has low specifici...

The important meaning of the optical fiber connector scratches detection was introduced based on wavelet packet and machine vision. To detect the optical fiber connector scratches by using the UltraPAC system, aiming at the scratches feature, the method of analyzing and extracting the scratches eigenvalue by using wavelet packet analysis and pattern recognition by making use of the wavelet neur...

Piezoelectric optical scanner is developed for multi-coordinate control of optical laser beam. Such type of optomicro-mechanical systems can be used for accurate angular or linear deflection of optical elements in various optomechanical and optoelectronic systems. The operating principle of these devices is based on piezoelectric effect and on conversion of high-frequency multi-dimensional mech...

Transparency of the optical layer offers the possibility to design a network that operates at varying transmission bit rates. While variable bit rate interfaces are being tested and will soon provide the possibility to optimally select the transmission rate for each lightpath, the potential advantages of relying upon multiple transmission rates in the optical network are ready yet to be fully e...

Multi-log2N networks architecture is attractive for constructing optical switches, and the related routing algorithms are critical for the operation and efficiency of such switches. Although several routing algorithms have been proposed for multi-log2N networks, a full performance comparison among them is not available by now. Thus, this paper is committed to such a comparison in terms of block...