Title :
Temperature-tuned ZnS etalon filters for WDM systems
Author_Institution :
AT&T Bell Labs., Holmdel, NJ, USA
fDate :
6/1/1992 12:00:00 AM
Abstract :
A simple temperature-tunable (5 GHz/ degrees C) ZnS etalon filter for channel selection and noise filtering in amplified wavelength-division (WDM) systems is reported. It has a large free spectral range (30 nm), a narrow passband (4.6 AA), and a low insertion loss (1 dB). The filter has been used for channel selection in a WDM system without any degradation in the receiver sensitivity. When the filter was locked to a desired channel using a simple digital servoloop, it maintained a very stable transmission (maximum drift <3%) even when the wavelength of the transmitter laser was intentionally changed by as much as 1 nm.<>
Keywords :
II-VI semiconductors; frequency division multiplexing; light interferometers; multiplexing equipment; optical communication equipment; optical filters; thermo-optical effects; tuning; zinc compounds; 1 dB; WDM systems; ZnS etalon filters; channel selection; digital servoloop; large free spectral range; low insertion loss; narrow passband; noise filtering; semiconductor; temperature tuning; Degradation; Digital filters; Filtering; Insertion loss; Laser stability; Laser transitions; Passband; Transmitters; Wavelength division multiplexing; Zinc compounds;
Journal_Title :
Photonics Technology Letters, IEEE
