Title :
Polarization independent, linear-tuned interference filter with constant transmission characteristics over 1530-1570-nm tuning range
Author :
Mekada, N. ; Al-Hamdan, A. ; Chong, T.H. ; Daut, D.G.
Author_Institution :
Santec Corp., Komaki, Japan
fDate :
6/1/1997 12:00:00 AM
Abstract :
We present a polarization independent optical tunable filter (OTF) with nearly constant transmission characteristics over 1530-1570 nm. The tuning is achieved by horizontally sliding an interference filter, resulting in a very low polarization dependent loss (PDL)<0.1 dB and nearly constant characteristics over the tuning range. By cascading interference filters in double or triple stage, narrower bandwidth characteristics are obtained allowing for smaller channel spacing in wavelength division multiplexing (WDM) systems. Experimental results for PDL, loss, and bandwidth are presented and compared to those of angle-tuned filter. The proposed OTF has shown superior performance promising a practical solution for dense WDM applications.
Keywords :
band-pass filters; interference filters; light polarisation; optical losses; tuning; wavelength division multiplexing; 1530 to 1570 nm; WDM; bandwidth; cascading; constant transmission characteristics; dense WDM applications; double stage; horizontally sliding; linear-tuned interference filter; narrower bandwidth characteristics; polarization independent optical tunable filter; practical solution; smaller channel spacing; triple stage; tuning range; very low polarization dependent loss; wavelength division multiplexing; Band pass filters; Bandwidth; Interference; Optical filters; Optical losses; Optical polarization; Optical tuning; Page description languages; WDM networks; Wavelength division multiplexing;
Journal_Title :
Photonics Technology Letters, IEEE
