Optically tunable fiber grating transmission filters.
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.
Lai
Yicheng
Y
Photonics Research Group, School of Engineering and Applied Science, Aston University, Birmingham B4 7ET, UK. laiy@aston.ac.uk
Zhang
W
W
Zhang
L
L
Williams
J A R
JA
Bennion
I
I