Showing papers on "Mode scrambler published in 1987"
TL;DR: In this paper, the output power combining capability and the stable operation of the desired mode in a cylindrical cavity multiple-device oscillator were discussed, in which several devices are placed inside a cavity to combine the output of all devices by coupling with the TM020 mode of the cavity.
Abstract: Presented in this paper is a discussion of the output power combining capability and the stable operation of the desired mode in a cylindrical cavity multiple-device oscillator, in which several devices are placed inside a cylindrical cavity to combine the output of all devices by way of coupling with the TM020 mode of the cavity. A lumped element equivalent circuit is first derived that has the fundamental characteristic of the oscillator structure. From the modal analysis based on this equivalent circuit, it is found that the oscillation output as the sum of the available powers of individual devices can be obtained in principle at TM010 and TM020 modes. It is also noted that the TM020 mode cannot be a stable mode when it is chosen as the desired mode and the TMm10 mode (m ≧ 1) is generated as a stable rotational or standing wave mode. Then we discuss the method of loading the resistor for suppressing unwanted modes in which only the desired output combining mode is stable. Finally, an eight-device oscillator with a simple structure fabricated for trial is used in experiments of power combining and unwanted mode suppression and the results of the analysis of the modal analysis are qualitatively confirmed.
3 citations
TL;DR: In this article, an optical fiber coupler based on the semi-linear passive phase conjugate mirror is analyzed and the threshold coupling strength is determined from theoretical considerations, assuming good mode matching between the light incident on the fiber and the propagating mode.
Abstract: An optical fiber coupler based on the semi-linear passive phase conjugate mirror is analyzed. The threshold coupling strength is determined from theoretical considerations. An estimate of 50% for the overall coupling efficiency is made, assuming there is good mode matching between the light incident on the fiber and the propagating mode. The coupler exhibits a high degree of alignment insensitivity allowing for simple manufacture.
3 citations
Patent•
26 Dec 1987
TL;DR: In this paper, the authors proposed a method to uniformly distribute or couple a multimode incident light beam by interposing an optical branching and coupling part composed of an optical waveguide so that incident light is branched and coupled alternately and repeatedly in multimode optical waveguides.
Abstract: PURPOSE:To uniformly distribute or couple a multimode incident light beam by interposing an optical branching and coupling part composed of an optical waveguide so that incident light is branched and coupled alternately and repeatedly in a multimode optical waveguide. CONSTITUTION:Center axes of optical waveguides forming a mode scrambler cross each other as shown by dashed lines to repeat branching and coupling and the outer shape of the optical waveguides is a bellows type. An optical branching and coupling part consisting of the multimode optical waveguides varies in branching ratio depending upon the mode distribution unless the mode scrambler which performs mode mixing operation is arranged in front of a branching and coupling part, so when the branching and coupling are repeated, the mode distribution is disordered at every time to cause a failure in uniform branching and coupling, but the bellows type mode scrambler is positioned in front of the branching and coupling part, so that the mode distribution right before each branching and coupling part is approximated to a stationary mode distribution, thereby performing uniform branching and coupling.
1 citations