A multiwavelength erbium-doped fiber (EDF) laser based on a nonlinear amplifying loop mirror (NALM) is proposed and experimentally demonstrated. The NALM provides intensity-dependent transmissivity to equalize different-wavelength powers and the transmission can be uniquely optimized by controlling the cavity loss associated with a section of un-pumped EDF, which also enhances the output signal...

The air-hole assisted few-mode fiber (AH-FMF) enables modal intensity balance and offers a profound prospect in gain equalization with the combination of adaptive ion doping. In this paper, we proposed an AH-FM-EDF multi-layered erbium doping profile. AH-FM-EDF, due to central air hole, only first radial order modes (LP01, LP11, LP21, LP31) are supported, all confined same high refractive index...

We present a new algorithm for testing the feasibility of a set of nonrecurrent tasks (or jobs) with real-time constraints scheduled under the EDF policy (Earliest Deadline First). The proposed feasibility test has a lower complexity than the previously known test. The rst step of the algorithm is to construct the Hasse diagram of the set of tasks where the partial order is de ned by the inclus...

In a real time system contained various type of scheduling algorithms. They are used for determine which processes should be executed by the CPU when there are different processes to be executed. Neuro fuzzy logic approaches are very effective for scheduling real time task. This paper presents a review on scheduling algorithm of real time task. Then, discuss the limitations of EDF algorithm and...

In this paper, we propose a reasonably simple and near-optimal soft aperiodic task scheduling algorithm in dynamic priority systems. The proposed algorithm has extended the EDF-CTI (Earliest Deadline First-Critical Task Indicating) Algorithm [4] in such a way of modifying the slack calculation method which in turns resolves the unit scheduling and the critical task misindicating problems. The p...

We propose and demonstrate a multiplexing method for ultrasonic sensors based on fiber Bragg gratings (FBGs) that are included inside the laser cavity of a fiber-ring laser. The multiplexing is achieved using add-drop filters to route the light signals, according to their wavelengths, into different optical paths, each of which contains a separate span of erbium-doped fiber (EDF) as the gain me...

We develop a novel discriminative sensing technique of strain and temperature using Brillouin scattering and fluorescence in an erbium-doped fiber (EDF). First, we show that the fluorescence intensity ratio (FIR), the ratio of the fluorescence intensities at two different wavelengths (1530 nm and 1565 nm in this experiment), is linearly dependent on temperature (with a coefficient of 5.6 × 10⁻⁴...

In this article we investigate how a particular vision of the future EU defence has embedded itself into different arenas politics over decades, and is currently gaining material expression in European Defence Fund (EDF). Through an historiographic approach, traced development narrative on security, innovation, research, economic growth based fears technology gaps dependence US, belief potentia...

This paper addresses the problem of scheduling real-time jobs that have multiple feasible intervals. The problem is NP-hard. We present an optimal branch-and-bound algorithm. When there is time to compute the schedule, this algorithm can be used. Otherwise, the simple heuristics presented here can be used. In addition, a priority-boosting EDF algorithm is designed to enhance the timeliness of j...

The paper addresses the issue of reserving resources at ATM switches along the path of calls requiring a deterministic bound on end-to-end delay. The switches are assumed to schedule outgoing cells using the EarliestDeadline -First (EDF) scheduling discipline. EDF is known to be an optimal scheduling discipline when providing delay bounds to a number of calls being served by a single scheduler....