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.

Nondestructive measurement method of individual mode loss for waveguides

Abstract: The device concerns measuring the propagation and bending losses that take place in the individual mode of the multi-mode waveguide. The method applied is a new one comprising butt-couple and prism-couple together with phase-modulation method. Electrodes are made on the waveguide, and applied with voltage. The electro-optical effect is used to modulate the effective length of the waveguide in forming a Fabry-Perot etalon. From here, the contrast of the butt-couple's output and the loss can be measured. At the same time, as the prism-couple is able to separate the multiple modes individually, and measure the contrast and loss of each mode through every output mode which are then compared with the butt-couple, each mode's propagation and bending losses values of the multi-mode waveguide can be derived.

Equilibrium mode distribution in w-type glass optical fibers

Abstract: Power flow equation is used to calculate equilibrium mode distribution in W-type glass optical fibers. It has been shown how the coupling length for achieving the equilibrium mode distribution in W-type glass optical fibers varies with the depth and width of the intermediate layer and coupling strength for different widths of launch beam distribution. W-type optical fibers have shown effectiveness in reducing modal dispersion and bending loss.

Compact higher-order mode converter based on all-fiber phase plate segment

Abstract: We propose a simple design of LP 11 spatial mode converter by splicing an all-fiber binary phase plate segment between SMF and FMF. More than 13dB modal extinction ratio was successfully achieved with 4.5dB insertion loss over a wide wavelength range.

Optimization of spatial aperture-sampled mode multiplexer for a few mode fiber

Abstract: An optimization procedure for spatial mode multiplexing from individual single mode fibers into a few mode fiber based on a spatial aperture sampling concept has been developed By placing space-variant imaging elements between the single mode and few mode fibers, each beam aperture can be shaped for lower loss coupling and low mode dependent losses The optimization achieves a record theoretical −15 dB insertion loss for a three mode fiber (improving on the previous theoretical −2 dB record), and an insertion loss of −159 dB for a six mode fiber

Development of Equilibrium Mode Distribution (EMD) in a Fiber - A Characterization of the Transient Behavior and Steady State Mandrel (SSM) for Corning Data Broadband Fiber (dBF)

Abstract: Contained in this paper are empirical results leading to a better understanding of the development of a steady state power distribution in an optical fiber, commonly referred to as Equilibrium Mode (Power) Distribution (EMD). First, three terms are defined and the importance of their measurement given: Transient Loss, Steady State Mandrel (SSM) Prescription, and Mode Power Distribution (MPD) Measurement. Second, the results of the transient loss testing and the mandrel wrap experiment, which determined the SSM (a mandrel which can be used for convenient attenuation measurement), are given for 85μm core fiber (Corning Data Broadband Fiber (dBF)). Third, MPD measurements verifying the conclusions drawn concerning the establishment of EMD or steady state are given as a function of fiber length and for various launch conditions.This paper has two primary conclusions. First, by actual measurement of the relative mode power distribution in sample fibers, steady state or EMD has been shown to have been established. Second, a mode filter in the form of a mandrel around which the sample was wrapped five times has been chosen such that the steady state power distribution was reproduced.