Title :
Rapidly tunable narrowband wavelength filter using LiNbO3 unbalanced Mach-Zehnder interferometers
Author :
Wooten, Ed L. ; Stone, Russell L. ; Miles, Ed W. ; Bradley, Eric M.
Author_Institution :
Tetra Tech. Data Syst., Carlsbad, CA, USA
fDate :
11/1/1996 12:00:00 AM
Abstract :
We demonstrate a rapidly tunable narrowband wavelength filter using unbalanced Mach-Zehnder interferometers in lithium niobate. It is designed to switch among eight channels spaced 50 GHz apart in optical frequency (approximately 0.4 nm in wavelength) in less than 50 ns. The insertion loss is 19 dB and crosstalk is less than -22 dB. The filter consists of a cascade of three electrooptically tunable unbalanced Mach-Zehnders and a feedback circuit to keep the filter centered on the desired wavelength
Keywords :
Mach-Zehnder interferometers; cascade networks; circuit feedback; electro-optical filters; electro-optical switches; lithium compounds; optical crosstalk; optical fibre networks; optical waveguide filters; 19 dB; 50 ns; LiNbO3; LiNbO3 unbalanced Mach-Zehnder interferometers; channel switching; crosstalk; electrooptically tunable unbalanced Mach-Zehnders; feedback circuit; fiber optic WDM; filter centering; insertion loss; rapidly tunable narrowband wavelength filter; switching time; three-stage cascade filter; Frequency; Lithium niobate; Narrowband; Optical crosstalk; Optical design; Optical feedback; Optical filters; Optical interferometry; Optical switches; Tunable circuits and devices;
Journal_Title :
Lightwave Technology, Journal of
