Title :
A 622.08 MHz narrow bandwidth SAW filter for clock recovery
Author :
Cabreira, Clovis M. ; Finardi, Celio A. ; De Almeida, Antonio Marini ; Barnet, Moacir
Author_Institution :
Res. & Dev. Centre, Telecomunicacoes Brasileiras SA, Campinas, Brazil
Abstract :
This paper describes the development of a 622.08 MHz surface acoustic wave (SAW) filter for use in clock recovery units to recover the clock signal from NRZ (non-return-to-zero) data streams in SONET and SDH systems. A narrow bandwidth filter (less than 0.2%) using two different interdigital transducers (IDTs), working on two different harmonic frequencies, was designed and fabricated by the R&D Centre of Telebras. A description of the design and the fabrication are summarized and measurement results of the SAW filter are shown
Keywords :
SONET; clocks; harmonics; interdigital transducers; optical communication equipment; surface acoustic wave filters; synchronous digital hierarchy; 622.08 MHz; NRZ data stream; SAW filter design; SAW filter fabrication; SDH systems; SONET systems; Telebras; clock recovery units; harmonic frequencies; interdigital transducers; measurement results; narrow bandwidth SAW filter; nonreturn to zero data stream; surface acoustic wave filter; Acoustic transducers; Acoustic waves; Bandwidth; Clocks; Optical signal processing; Power harmonic filters; SAW filters; SONET; Surface acoustic waves; Synchronous digital hierarchy;
Conference_Titel :
Microwave and Optoelectronics Conference, 1995. Proceedings., 1995 SBMO/IEEE MTT-S International
Conference_Location :
Rio de Janeiro
Print_ISBN :
0-7803-2674-1
DOI :
10.1109/SBMOMO.1995.509635
