Optical transmitter and optical modulator
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United States of America Patent
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Issued Date -
Dec 19, 2002
app pub date -
Jun 12, 2002
filing date -
Jun 19, 2001
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A feature of this invention is to realize a VSB modulation with a simple configuration. A data generating circuit (10) generates a transmission data composed of an optical pulse with duty factor of 50% according to a clock from a clock generating circuit (12). An optical source (14) generates a laser light that functions as an optical carrier to carry the transmission data generated from the data generating circuit (10) and applies it to a data modulator (16). The data modulator (16) intensity-modulates the laser light from the optical source (14) according to the transmission data from the data generating circuit (10) and generates an optical signal of an RZ optical pulse train to carry the transmission data. The generated optical pulse train is applied to a phase modulator (18). According to the clock from the clock generating circuit (12), a sine wave generating circuit (20) generates a sine wave signal synchronizing and having the same frequency with the clock. A phase shifting circuit (22) shifts phase of the sine wave from the sine wave generating circuit (20) by .pi./2 and applies it to the phase modulator (18). A phase modulator (18) modulates optical phase of each optical pulse in the optical pulse train from the data modulator (16) according to the sine wave from the phase shifting circuit (22).
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