Apparatus for generating optical carrier suppressed return-to-zero
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United States of America Patent
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-
Aug 12, 2008
Grant Date -
Sep 23, 2004
app pub date -
Mar 18, 2004
filing date -
Mar 19, 2003
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An apparatus for generating a Carrier-Suppressed Return-to-Zero (CS-RZ) signal is disclosed. The apparatus includes a mixer, a Low Pass Filter (LPF), a driver amplifier and a single external modulator. The mixer generates a modulator input by mixing data with a half clock signal. The LPF band-limits the modulator input data into low frequency band data. The driver amplifier amplifies the modulator input data generated by the mixing of the mixer and the band-limiting of the LPF. The external modulator generates CS-RZ signal, in which the phases of adjacent pulses have been inverted, by applying bias voltage to the modulator input data to be placed at the null point of the transfer function of the external modulator.
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