A Monte Carlo simulation technique has been used to model the cathode fall region of a glow discharge under the influence of a nonuniform electric field and a transverse magnetic field. It has been shown experimentally that a magnetic field can serve as an effective means for reducing the growth of discharge instabilities. The stabilization mechanism involves the dispersion of localized charged particle perturbations over the discharge area in a time less than that required for an instability to fully develop. The results of this paper provide a deeper insight into the magnetic stabilization technique, which has the potential of increasing the power output of a wide variety of gas lasers.
Optical transmitter and receiver modules with passive impedance-matching circuits have been designed, constructed, and tested. A direct current modulated InGaAs DFB laser, operating at 1.3 micron, and an InGaAs PIN photodiode were matched to 50 ohms with passive, mixed lumped and distributed element, matching circuits. A linkinsertion loss of 21 dB with a 3 dB bandwidth of 900 MHz has been demonstrated. Through the use of higher-order matching circuits, link-insertion loss variations across the satellite downlink frequency band (3.6-4.2 GHz) have been kept below f0.5 dB.
Application of peotonics in beam forming and steering for phased-array antennas is addressed in this paper. The feasibility of photonics in space communications systems centers around the basic issues such as the derived benefits, overall performance, and complexity and cost of implementation. Several optical beam forming and steering payloads are assessed for their capability and technology feasibility. Also included are the results of demonstrated proof-ofconcept (POC) schemes.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.