Optical wave transmission
AssigneeKokusai Denshin Denwa Kabushiki Kaisha
InventorsYoshio Karasawa, Takashi Matsudo, Hisato Iwai, Takayasu Shiokawa
Life of this patent
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Abstract
A system for communicating between mobile units and an exchange station, with a radio frequency signal, in which an electric signal from a telephone exchange of the telephone station is converted into an optical signal with an electricity-to-light converter. The optical signal is carried via an optical fiber cable to a transmission communication antenna for emission, with amplification of the optical signal if necessary. The emitted signal is received by a receiving communication antenna, amplified with an optical amplifier if necessary, and converted to an electric signal with a light-to-electricity converter.
Claims3
A communication system comprising:
- at least one wireless base station including:
- a first optical communication antenna, and
- a communication exchange station which controls each wireless base station, said communication exchange station including:
- a telephone exchange for providing an electric signal,
- means for converting said electric signal from the telephone exchange into an optical signal,
- a second optical communication antenna, and
- means for directing said optical signal from said means for converting through a first optical fiber cable to said second optical communication antenna for transmission thereof into space, whereby said optical signal transmitted through space is received by said first optical communication antenna;
- and
- each said wireless base station further including:
- means for transferring said optical signal received by said first optical communication antenna to a second optical fiber cable,
- a light-to-electricity converter for converting said optical signal from said second optical fiber cable to a radio-frequency signal, and
- a wireless transmission antenna for transmitting said radio-frequency signal.
Dependencies are inferred from the claim text.