Design of a compact static Fourier transform spectrometer in integrated optics based on a leaky loop structure.
A compact static Fourier transform spectrometer for integrated optics is proposed. It is based on a plane leaky loop structure combined with a plane waveguide. The interference pattern produced in the loop structure leaks outside of it and is guided in the plane waveguide to the photodetector array. This configuration allows one to control the shape of the field pattern at the end of the plane waveguide. A large fringe pattern with a high interference fringe contrast is obtained. A two-dimensional model based on an aperiodic Fourier modal method is used to modelize the coupling between the bent and the plane waveguides, completed with the Helmholtz-Kirchhoff propagation. This concept gives access to plan and compact spectrometers requiring only a single low-cost realization process step. The simulation has been done to realize a spectrometer in glass integrated optics (Deltalambda=6.1 nm at 1500 nm).
Martin
Bruno
B
Institut de Microelectronique Electromagnetisme et Photonique et le Laboratoire d'Hyperfrequences et de Caracterisation, Grenoble CEDEX 1, France. martin@minatec.inpg.fr
Morand
Alain
A
Benech
Pierre
P
Leblond
Gregory
G
Blaize
Sylvain
S
Lerondel
Gilles
G
Royer
Pascal
P
Kern
Pierre
P
Le Coarer
Etienne
E