A new surface acoustic wave (SAW) filter configuration that consists of 3\lambda/8-wide meander-type electrodes and 3\lambda/8-wide excitation electrodes on ST-cut Quartz was designed for use in a 2.5-Gb/s optical communications system. New submicron process techniques using the phase shifting method as well as several types of resist were investigated to fabricate this filter. It had an insertion loss of less than 14 dB and a Q of about 700, and satisfied all required system specifications over a temperature range from 0 to 60C.
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