Date of Award
Master of Science in Electrical Engineering - (M.S.)
Electrical and Computer Engineering
Janet Lehr Jackel
Roy H. Cornely
To be of practical use in optical communications networks, optical components must have both low on-chip losses and efficient coupling to fibers, semiconductor lasers and detectors. In this thesis work two types of channel waveguides were designed and fabricated on BK7 glass substrate using a low-cost ion-exchange process. The first type of waveguide was formed in a simple sequence of ion-exchange and post-exchange annealing. These single mode waveguides had large mode size and were efficiently coupled to single mode fibers. The lowest loss achieved in fiber-guide direct coupling was 1.25 dB. The second type of waveguide was formed in a two-step inverse ion-exchange. The single mode waveguides formed in this way had small mode size and were compatible with lasers. The lowest loss achieved in laser-guide butt coupling was around 4 dB. The on-chip mode size transition from laser-compatible to fiber-compatible could be achieved by a thermal tapering annealing step.
Hu, Shiqing, "Ion exchanged glass waveguides with efficient coupling to fibers and lasers" (1992). Theses. 2282.