Multi-Mode And Single-Mode Optical Fiber Guides With Rectangular Core For Communication Systems

V. V. Cherny; G. A. Juravlev; A. I. Kirpa; V. R Tjoy

doi:10.1117/12.957236

26 July 1979 Multi-Mode And Single-Mode Optical Fiber Guides With Rectangular Core For Communication Systems

V. V. Cherny, G. A. Juravlev, A. I. Kirpa, V. R Tjoy

Proceedings Volume 0176, Guided Wave Optical Systems and Devices II; (1979) https://doi.org/10.1117/12.957236
Event: Technical Symposium East, 1979, Washington, D.C., United States

Abstract

The confined propagation of guided optical modes in fiber guides with rectangular (square) cores is proposed and analyzed. An analysis is made of the waveguide characteristics of different types of a singly and doubly clad optical fiber guides with rectangular cores, including the W-shaped refractive index distribution. A detailed investigation is made of the characteristic equation and dispersion characteristics of guided modes in such fiber guides are found. Prospective applications are presented. It is shown that it is possible to make single-mode fiber guides with rectangular core with good dispersion characteristics, and relatively large transverse dimensions of the rectangular core as well as a self-filtering fiber guide can be constructed. 17ibex guides with rectangular (square) core are one kind of the large family of fibers for optical communications systems. In some practical cases it is necessary to provide the fiber guides with rectangular core. It is important for compatibility with terminal devices. Some fibers are now available with losses as low as a few decibels per kilometer. However, some basic problems must be solved.(1,2) A practical method of splicing fibers with injection semiconductor lasers is one of them, because in order to increase the efficiency of the coupling between laser and fiber it seems better to have the geometry of the fiber's core cross section the same as the injection region of the semiconductor laser.( 3) In the first part of this paper we shall investigate a fiber guide with rectangular core that is surrounded by single infinite (in comparison with wavelength) cladding. In the second part we shall investigate optical fiberguide which is composed of three portions: the rectangular core, inner cladding, and outer cladding. The main stress is on fiber guide W-type when the rectangular core has the largest refractive index of the three, and the outer cladding index is the next largest.

Citation Download Citation

V. V. Cherny, G. A. Juravlev, A. I. Kirpa, and V. R Tjoy "Multi-Mode And Single-Mode Optical Fiber Guides With Rectangular Core For Communication Systems", Proc. SPIE 0176, Guided Wave Optical Systems and Devices II, (26 July 1979); https://doi.org/10.1117/12.957236

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