Coupled-mode analysis of a resonant channel drop filter using waveguides with mirror boundaries
2006 (English)In: Journal of the Optical Society of America. B, Optical physics, ISSN 0740-3224, Vol. 23, no 1, 104-113 p.Article in journal (Refereed) Published
The operation of resonant channel drop filters is analyzed using coupled-mode theory. The resonator is chosen to support a single standing-wave mode, and, in the ideal case, one can realize 100% in-plane channel transfer by properly applying mirror boundaries to the waveguides. The presence of the mirrors causes the resonant frequency to shift, and the system Q factor also changes accordingly. The two variables are related by a closed curve depending on the phase introduced by the reflection and wave propagation between the two ports. When one works on different regions of the curve, the system can be tuned to work at different resonant frequencies with minimum Q-factor variations or vice versa. The mirror can be frequency selective. The same single-mode cavity can be used as a resonant mirror to terminate the waveguide. The combined system is analyzed, and we find the conditions to achieve 100% channel transfer as well as to maintain a simple Lorentzian line shape of the transmission spectra. The analysis is verified by two-dimensional (2D) finite-difference time-domain simulations in 2D hexagonal photonic crystals.
Place, publisher, year, edition, pages
2006. Vol. 23, no 1, 104-113 p.
Cavity resonators, Computer simulation, Crystals, Finite difference method, Mirrors, Natural frequencies, Optical waveguides, Reflection, Time domain analysis
Atom and Molecular Physics and Optics
IdentifiersURN: urn:nbn:se:kth:diva-8021DOI: 10.1364/JOSAB.23.000104ISI: 000234528900015ScopusID: 2-s2.0-33644510447OAI: oai:DiVA.org:kth-8021DiVA: diva2:13230
QC 201009072008-02-222008-02-222010-09-07Bibliographically approved