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US 2003/0194163 A1Published application
Optical modulator of clock modulation type
AssigneeFujitsu Limited
InventorsMasaharu Doi, Tetsuo Ishizaka, Takehito Tanaka
Life of this patent
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Abstract
A first optical waveguide, a second optical waveguide, a first electrode, and a second electrode are integrated on a substrate. An optical modulator is provided with a clock signal generator for generating an RZ signal by applying a clock signal to either the first or second electrode, and an NRZ data signal generator for supplying an NRZ data signal to the remaining electrode. Thus, the space required by the optical modulator is reduced while tolerance of the same is improved, thus reducing costs for constructing the optical modulator.
Claims15
An apparatus comprising:
- a substrate;
- a first optical device formed on the substrate and generating an optical pulse train at a predetermined repetition rate;
- and
- a second optical device formed on the substrate and gating selected pulses of the optical pulse train in accordance with a data signal, to thereby produce an optical data signal.
1 more element
An apparatus comprising:
- a first optical modulator generating an RZ optical pulse train at a predetermined repetition rate in accordance with a clock signal provided to the first optical modulator;
- and
- a second optical modulator modulating the RZ optical pulse train in accordance with a NRZ data signal provided to the second optical modulator, to thereby produce an RZ optical data signal.
Dependencies are inferred from the claim text.