title: Optically tunable fiber grating transmission filters.
abstract: We propose and demonstrate single- and multiple-passband fiber grating transmission filters that are remotely tunable by exploitation of the optical pump-induced thermal effects in Er/Yb-codoped fiber sections. A repeatable, wavelength-independent induced phase shift of 0.1 pi/mW is obtained without hysteresis and anisotropic effects. A transmission extinction ratio of >23 dB with a 3-mW change in pump power is achieved.
authors.affiliation: Photonics Research Group, School of Engineering and Applied Science, Aston University, Birmingham B4 7ET, UK. laiy@aston.ac.uk
authors.forename: Yicheng
authors.initials: Y
authors.lastname: Lai
authors.forename: W
authors.initials: W
authors.lastname: Zhang
authors.forename: L
authors.initials: L
authors.lastname: Zhang
authors.forename: J A R
authors.initials: JA
authors.lastname: Williams
authors.forename: I
authors.initials: I
authors.lastname: Bennion