title: Free-space-wave drop demultiplexing waveguide device fabricated by use of the interference exposure method.
abstract: Integration of free-space-wave add-drop multiplexers that consist of focusing grating couplers (FGCs) and distributed Bragg reflectors (DBRs) in thin-film waveguides have been investigated for construction of an intraboard wavelength-division-multiplexing optical interconnection. Compact optics of a Lloyd mirror configuration and a contact-type mask aligner were combined as an interference exposure system for fabrication of DBRs of 300 microm coupling length. DBRs were integrated with FGCs on a thin-film waveguide on a glass substrate for two-channel wavelength-drop demultiplexing from guided waves to free-space waves. Measured outcoupled wavelengths of two free-space waves from two pairs of a FGC and a DBR agreed with the design values of 845 and 849 nm.
authors.affiliation: Department of Electronics and Information Science, Kyoto Institute of Technology, Matsugasaki, Sakyoku, Kyoto 606-8585, Japan. ura@dj.kit.ac.jp
authors.forename: Shogo
authors.initials: S
authors.lastname: Ura
authors.forename: Mei
authors.initials: M
authors.lastname: Hamada
authors.forename: Junpei
authors.initials: J
authors.lastname: Ohmori
authors.forename: Kenzo
authors.initials: K
authors.lastname: Nishio
authors.forename: Kenji
authors.initials: K
authors.lastname: Kintaka