Topic
Equilibrium mode distribution
About: Equilibrium mode distribution is a research topic. Over the lifetime, 928 publications have been published within this topic receiving 14939 citations.
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Patent•
NEC1
TL;DR: In this paper, a leaky wave propagation region in a form of a quadrilateral shape having a length of one edge of L is located in the vicinity of a point where the center axes extended in the longitudinal directions of respective incident side and side single-mode waveguides, with an effective propagation wavelength of a dominant mode there of to be cos(θ/2) times of an effective propagating wavelength λG.
Abstract: A waveguide element is capable of realizing acute waveguide discontinuity, such as a right angle bending, (L-shaped bending) or branching (T-shaped branching). Two single mode waveguides having the identical cross-sectional structure form a waveguide discontinuity where center axes thereof extending in the longitudinal direction intersect with each other at an angle θ (0<θ<90°). A leaky wave propagation region in a form of a quadrilateral shape having a length of one edge of L is located in the vicinity of a point where the center axes extended in the longitudinal directions of respective incident side and side single mode waveguides, with an effective propagation wavelength of a dominant mode there of to be cos(θ/2) times of an effective propagation wavelength λG. Thus, an energy of the wave launched from an incident end of the single mode waveguide can be efficiently taken out from a end of the single mode waveguide.
10 citations
Patent•
21 Nov 2008TL;DR: In this article, a surface-emitting laser has an active layer between a first distributed Bragg reflector and a second distributed BR reflector, which can oscillate in a single longitudinal mode, suppressing longitudinal mode hopping.
Abstract: A surface-emitting laser has an active layer between a first distributed Bragg reflector and a second distributed Bragg reflector. The first distributed Bragg reflector is formed so as to have a resonant mode and a first longitudinal mode different from the resonant mode included in the reflectivity stop band and a second longitudinal mode different from the resonant mode and the first longitudinal mode excluded from the reflectivity stop band. Oscillation is suppressed in the first longitudinal mode and in the second longitudinal mode. As a result, the surface-emitting laser can oscillate in a single longitudinal mode, suppressing longitudinal mode hopping.
10 citations
TL;DR: In this article, a model for the modal noise generated in a single-mode fiber optic network consisting of a number of connectors or splices is presented, and the effect of modal noises on the link is discussed and expression for signal to noise ratio has been obtained.
9 citations
TL;DR: The mode index and mode field of a triple-core waveguide are simulated by the compact supercell method and the FEM method, and the coupling property of LP(11) mode is analyzed, for the first time to the authors' knowledge, which is similar to that ofLP(01) mode except the different coupling length.
Abstract: The mode index and mode field of a triple-core waveguide are simulated by the compact supercell method and the FEM method. The coupling property of LP(11) mode is analyzed, for the first time to our knowledge, which is similar to that of LP(01) mode except the different coupling length. Both LP(01) and LP(11) modes can be separated based on their different coupling lengths in the waveguide. When both modes are put into the central port, they will come out on different ports by optimizing the coupler length, and the mode extinction ratio can approach 30dB.
9 citations
Patent•
30 May 1995TL;DR: In this paper, a wavelength selective structure is coupled to an adiabatic Y-coupler via a multimode section which supports both symmetric and antisymmetric modes.
Abstract: A wavelength selective structure is coupled to an adiabatic Y-coupler via a multimode section which supports both symmetric and antisymmetric modes. One single mode branch of the coupler converts guided light to a symmetric mode, whereas the other single mode branch converts guided light to an anti-symmetric mode. The structure, which includes a pair of single mode waveguide arms coupled to the common section and a reflection device (such as a grating or ROR) located in each arm, converts reflected light from a symmetric mode to an anti-symmetric mode and conversely. Applications described include a channel dropping fiber and channel balancing apparatus for WDM systems, and a dispersion compensator for fiber optic systems.
9 citations