Title :
Crosstalk in a lossy directional coupler switch
Author :
Chinni, V.R. ; Huang, T.C. ; Wai, P.K.A. ; Menyuk, C.R. ; Simonis, G.J.
Author_Institution :
Dept. of Electr. Eng., Maryland Univ., Baltimore, MD, USA
fDate :
7/1/1995 12:00:00 AM
Abstract :
Crosstalk due to material absorption in a two-waveguide, symmetric directional coupler switch is investigated. In a material with absorption, it is not possible to completely eliminate the crosstalk by adjusting the coupling length. The coupling length for minimum crosstalk differs from that of lossless systems. Theoretical limits of the lowest achievable crosstalk and the corresponding coupling lengths are calculated. The results show that the effect of absorption on crosstalk is more severe when the devices are designed for low crosstalk. The increase in crosstalk due to absorption can be as high as 20 dB. The material absorption is thus a critical parameter in designing low crosstalk devices
Keywords :
integrated optics; light absorption; optical couplers; optical crosstalk; optical design techniques; optical directional couplers; optical switches; optical waveguide theory; coupling length; coupling lengths; critical parameter; lossless systems; lossy directional coupler switch crosstalk; low crosstalk device design; lowest achievable crosstalk; material absorption; minimum crosstalk; two-waveguide symmetric directional coupler switch; Absorption; Crosstalk; Dielectric losses; Directional couplers; Educational institutions; Optical waveguides; Plasmas; Power distribution; Switches; USA Councils;
Journal_Title :
Lightwave Technology, Journal of
