Optocouplers offer tremendous advantages in minimizing EMI and noise susceptibility. It is not an exaggeration to say that a healthy sprinkling of opto-isolation has often meant the difference between a “good idea” and working product. Yet, these very useful devices are often overlooked as possible solutions in designs because they are perceived to be “slow”. It is true that there are some limi...

This paper presents a study of multi-core erbium doped couplers as an alternative to conventional erbium-doped fiber amplifiers. The couplers can reduce the power unbalance between WDM channels along an optical communication link. Different configurations of couplers are analyzed and the influence of the number of cores is studied.

in this paper, some applications of the method of least squares (mls) for the solution of various problems in electromagnetics engineering is briefly reviewed. here, mls is employed for the solution of various problems such as solution of equations, curve fitting to measured data, generalized fourier coefficients, linear operator equations, inegro-differential equations, electrostatics and magn...

Recent progress in research on optical fiber devices, especially optical fiber couplers and optical fiber grating couplers, by a new fabrication method, that is, a CO2 laser irradiation method is reviewed. Furthermore, applications of optical fiber grating couplers are also described. Key-words: Optical Fiber Device, Optical Fiber Coupler, Optical Fiber Grating Coupler

Recent high power tests of x-band accelerating structures at SLAC have shown that their performance is limited by breakdowns in couplers. The behavior of these breakdowns is consistent with a model of pulsed heating due to high magnetic fields. The observed damage is located in the region of high magnetic fields. To calculate these magnetic fields, 3D electrodynamics models of the couplers were...

In this work, we develop a simulation method based on supermode theory and transfer matrix formalism, and then apply it to the analysis and design of taper couplers for vertically integrated As2S3 and Ti: LiNbO3 hybrid waveguides. Test structures based on taper couplers are fabricated and characterized. The experimental results confirm the validity of the modeling method, which in turn, is used...

Miniaturized and tunable 3 dB hybrid and rat-race couplers using capacitively-loaded (C-loaded) transmission lines are designed. Couplers’ compactness has been achieved by substituting the conventional quarter wave transformers in both couplers by their equivalent C-loaded units. The tunable center frequency of the proposed couplers is realized by varying the transmission line loading capacitan...

Acoustic Directional Couplers permit separation of forward and reverse sound pressure waves. This separation opens the way to traceable precision acoustic reflection measurements. In order to span the audio frequency range, multiple couplers will be required, as each operates over a frequency range of slightly more than one octave. To reach 20kHz or above requires vary small, mechanically preci...

Metallo-dielectric superlenses transfer subwavelength-scale information without magnification. The so-called hyperlenses additionally magnify, transferring images into traditional far-field optics. We target hyperlenses based on the “canalization” phenomenon in an array of wires, modified to form an open fan, also called “endoscope.”We use an integrated optics design with silicon wires, fed for...

New, compact multimode interference couplers with tunable power splitting ratios have been realized. Experiments show large tuning ranges. Such couplers are needed to optimize ON–OFF ratios in interferometric devices and may find applications as extremely compact switches.