Integrated All-Optical Switching of Photonic Streams
Original Publication Date: 1995-Nov-01
Included in the Prior Art Database: 2005-Mar-31
Disclosed is an all-optical waveguide switch, as illustrated in Fig. 1, based on carefully engineered gain and absorption. The known switches based on this principle have up to now operated with InGaAsP semiconductor optical amplifiers, using carrier injection via electrodes in the gain sections of the waveguide legs (1). It is herein proposed to provide the gain function via planar waveguide amplifiers such as 'Er' sup + doped SiO sub 2. The key advantages are: 1. The optical routing function is performed all-optically, 2. the optical losses are compensated within the device, or even some gain is provided, allowing the design of essentially loss-less devices. 3.