Sharif Digital Repository

Fiber core size determination from power transmission modulation for different fibers is reported.Three different fibers are tested and power variations of lateral displacement of the second fiber are obtained (lamp, red LED). From the averaged bandwidths of the response curves the core diameter of each fiber is determined. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:1225-1229, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25967 Copyright  

Design and operation of three different optical designs based on the light intensity modulation for investigation of the humidity effects on the air index of refraction are described. The measurement variable is the transmitted power, which depends on the refractive index of the medium in the path of a fiber-to-fiber optical design. Three different probes (probe #1, #2, and #3) are tested in which probe #1 and probe #2 can also check the presence of water or any other transparent liquid in the gap between the two axial fibers. Performances of the new systems are tested as a refractive index monitoring mean and experimental results are given. The variations of the modulated powers as... 

In this study operation of an optical design based on the intensity modulation for the refractive index change has been described. The reported instrument measures the transmitted output power depending up on the medium refractive index in the light path of a fiber-to-fiber design. A liquid cell is located between the fibers in the light path and power variations for different cold and hot water levels in the cell are measured. By using a reference humidity meter the calibration curve representing the relative humidity (%RH) as a function of the transmitted output power is obtained. For the hot water with the final temperature of T = 32.7°C the output power range of 255.0 -313.OnW is... 

Increasing delay and power variation has become a major challenge to designing high performance Multiprocessor System-On-Chips (MPSoC) in deep sub-micron technologies. As a result, a paradigm shift from deterministic to statistical design methodology at all levels of the design hierarchy is inevitable. In this paper, we propose a static variation-aware task scheduling and power mode selection algorithm for MPSoCs. The proposed algorithm is able to maximize the total power yield of the chip under a given performance yield constraint by searching for the optimal task scheduling and power mode selection policy for a specified multiprocessor platform. Experimental results are gathered by... 

Wireless infrared optical CDMA (W-OCDMA) is a new developing technique with some useful applications. Control and efficient use of optical power is a key issue in analysis and design of these systems. Also, multi user interference is a major source if impairment in these system. As a result, power control is a key issue in design and implementation of these systems. In this article we investigate a Dynamic Resource Management Algorithm (DRMA) as a framework, which employs power control to enable QoS in terms of reliability for multimedia traffic in W-OCDMA networks using Optical Orthogonal Codes (OOC's). A numerical method is also proposed to overcome computational difficulties of call...