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.

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...

The statistics of polarization-induced visibility fading is studied for fiber-optic interferometric (Michelson or Mach-Zehnder) sensor arrays made of either regular singlemode fibers or polarization-maintaining fibers. Performance is measured in terms of the probability to observe visibilities, all of which exceed a given value, for all members of the array. Very poor performance is obtained fo...

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...

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.

A program of study of planar dielectric grating couplers was undertaken. The study focused on the problems associated with using dielectric grating couplers to achieve high efficiency beam coupling to planar waveguide

A boundary variation method for the analysis of both infinite periodic and finite aperiodic waveguide grating couplers in two dimensions is introduced. Based on a previously introduced boundary variation method for the analysis of metallic and transmission gratings [J. Opt. Soc. Am. A 10, 2307, 2551 (1993)], a numerical algorithm suitable for waveguide grating couplers is derived. Examples of t...