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US 5,227,908 AGranted
Optical communication apparatus using intensity modulation
AssigneeNEC Corporation
InventorNaoya Henmi
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AssigneeNEC Corporation
InventorNaoya Henmi
Estimating the term…
A transmitter unit (100) including a semiconductor laser (101) as a carrier light exciting source, a biasing source (102) for providing the semiconductor laser with a d.c. biasing current, an external modulator (105) for intensity-modulating an output light of the semiconductor laser according to a transmission signal, and means (107; 210; 510; 701, 702, 703, 704) for causing the external modulator to output only the carrier light and either side-band light. Also provided is a receiver unit (150) including a receiver (151) for square-law detecting the carrier light and the side-band light supplied from the transmitter unit to obtain an electric signal, and a linear filter (152) for equalizing this electric signal. The present invention results in an optical communication apparatus capable of easily equalizing dispersion distortion caused in a transmission path (115) having a large dispersion from a light-intensity modulated light signal transmitted therethrough.
An intensity modulation optical communication apparatus including a transmitter unit for producing a single side-band intensity modulated light signal based on a carrier light and a transmission signal, and a receiver unit for receiving the single side-band intensity modulated light signal and reproducing the transmission signal therefrom, wherein said transmitter unit comprises:
Dependencies are inferred from the claim text.