Title :
Measurement of mode splitting in asymmetric Y-junctions
Author :
van der Tol, J.J.G.M. ; Laarhuis, J.H.
Author_Institution :
PTT Res. Lab., Leidschendam, Netherlands
fDate :
5/1/1992 12:00:00 AM
Abstract :
A measurement procedure is presented for the determination of mode splitting (or mode sorting) in asymmetric Y-junctions. This procedure avoids measurement errors introduced by bends, tapers, small damages in the waveguides outside the coupling region, variation in fiber-chip coupling, etc. It is based on the analysis of the normalized coupled power in an optical coupler in which a mode splitter is used. The method is illustrated with a mode splitter on lithium niobate. A value of 29.2+or-0.5 dB for the suppression of the unwanted mode is found, showing the applicability of the procedure.<>
Keywords :
integrated optics; lithium compounds; optical couplers; optical waveguides; LiNbO/sub 3/; asymmetric Y-junctions; bends; coupling region; fiber-chip coupling; measurement procedure; mode sorting; mode splitter; mode splitting; normalized coupled power; optical coupler; small damages; tapers; unwanted mode suppression; Communication system control; Isolators; Optical coupling; Optical fiber couplers; Optical fiber polarization; Optical interferometry; Optical polarization; Optical sensors; Optical waveguides; Transmission line matrix methods;
Journal_Title :
Photonics Technology Letters, IEEE
