Open AccessExperiment and Theory of an Active Optical Filter
Author(s) -
Duncan L. MacFarlane,
Marc P. Christensen,
Amr El Nagdi,
Gary A. Evans,
Louis R. Hunt,
Nathan Huntoon,
Jiyoung Kim,
Tae W. Kim,
Jay Kirk,
Tim P. LaFave,
Ke Liu,
Viswanath Ramakrishna,
Mieczyslaw Dabkowski,
Nahid Sultana
Publication year - 2011
Publication title -
ieee journal of quantum electronics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.661
H-Index - 127
eISSN - 1558-1713
pISSN - 0018-9197
DOI - 10.1109/jqe.2011.2174615
Subject(s) - engineered materials, dielectrics and plasmas , photonics and electrooptics
The role of gain in an optical filter is advanced by good agreement between theory and experiment presented herein. The particular integrated photonic filter is composed of four semiconductor optical amplifiers and one four-port coupler located at the intersection of the amplifiers. The four-port coupler is realized using frustrated total internal reflection off a very thin slab of alumina embedded in the substrate. The delta function response of the filter is measured using an ultra-fast laser and cross-correlator, and the measured transfer functions agree well with a z-transform-based description of the device.