DocumentCode :
1091581
Title :
Analysis of integrated-optics near 3 dB coupler and Mach-Zehnder interferometric modulator using four-port scattering matrix
Author :
Rediker, Robert H. ; Leonberger, Frederick J.
Author_Institution :
Massachusetts Institute of Technology, Lexington, MA, USA
Volume :
18
Issue :
10
fYear :
1982
fDate :
10/1/1982 12:00:00 AM
Firstpage :
1813
Lastpage :
1816
Abstract :
The scattering matrix formalism for a lossless four-port device is used to describe the interferometric performance of the integrated-optics near 3 dB coupler and, consequently, the Mach-Zehnder interferometric modulator as a function of coupler and/or power imbalance. For the case of a coupler consisting of three single-mode dielectric guides forming a Y junction, a fourth port is incorporated which takes all the power radiated out of the guided-wave system in the vicinity of the junction. The interferometric properties of the coupler are shown to be relatively insensitive to fabrication and/or design errors of a magnitude which would make the use of this junction in the reverse direction as a 3 dB divider very marginal. A coupler with an extinction ratio as an interferometer better than -26 dB corresponds to a power divider which couples 22 percent more power into one arm than the other. It is also shown that the near 3 dB coupler used as the output of an interferometric modulator is similarly insensitive to the inequality of the powers in the two arms.
Keywords :
Integrated optics; Optical couplers; Optical interferometry; Optical modulation/demodulation; Scattering matrices; Coupling circuits; Dielectrics; Fabrication; Optical scattering; Particle scattering; Performance loss; Power dividers; Symmetric matrices; Transmission line matrix methods; Waveguide junctions;
fLanguage :
English
Journal_Title :
Quantum Electronics, IEEE Journal of
Publisher :
ieee
ISSN :
0018-9197
Type :
jour
DOI :
10.1109/JQE.1982.1071425
Filename :
1071425
Link To Document :
بازگشت