Accession Number : ADP008074
Title : Ion-Exchanged Glass Waveguides with Improved Coupling to Semiconductor Lasers,
Corporate Author : BELL COMMUNICATIONS RESEARCH INC RED BANK NJ
Personal Author(s) : Jackel, Janet L. ; Hu, Shiqing
Report Date : APR 1992
Pagination or Media Count : 2
Abstract : Ion exchanged glass waveguide components can perform many functions needed in optical communications, but will find a use in communications networks only if insertion losses are low enough. Exchanged guides have been made with low optical propagation loss, and channel guides with excellent coupling to optical fiber have been made. In some cases, however, we require direct coupling to semiconductor lasers, which have much smaller mode size than fibers. A small mode size also serves to minimize losses in waveguide bends. We show here that exchanged guides with a large enough Delta n and small enough mode size can have low laser-to-guide coupling loss. The usual single-step exchange is of limited use: guides with large Delta n can be made, but sideways diffusion creates guides which are considerably wider than they are deep. Using an alternative two-step process we are able to improve the mode shape and obtain better coupling to lasers.
Descriptors : *OPTICAL COMMUNICATIONS, *FIBER OPTICS, CHANNELS, COMMUNICATIONS NETWORKS, DIFFUSION, FUNCTIONS, GLASS, SEMICONDUCTOR LASERS, SEMICONDUCTORS, SHAPE, WAVEGUIDE BENDS, WAVEGUIDE COUPLERS, ION EXCHANGE, OPTICAL WAVEGUIDES, FIBER OPTICS TRANSMISSION LINES, LASER BEAMS, TRANSMISSION LOSS, LIGHT TRANSMISSION.
Subject Categories : Fiber Optics and Integrated Optics
Distribution Statement : APPROVED FOR PUBLIC RELEASE