Patent US5493436A successfully refreshed from Google Patents.
US5493436A
Expired / Lapsed
US
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Optical wave transmission
Assignee: KDDI Corp
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Filing: 1995-03-21
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Granted: 1996-02-20
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Expires: 2015-03-21
Abstract
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.
Inventors
- 👤 Yoshio Karasawa
- 👤 Takashi Matsudo
- 👤 Hisato Iwai
- 👤 Takayasu Shiokawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:05
CPC Classifications
H; H04; H04B; H04B10/00; H04B10/11; H04B10/112; H04B10/1123; H04B10/1125; H04B10/25; H04B10/2575; H04B10/25752; H04B10/25758; H04B10/25759
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
158 words
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.
Claim 2
Dependent Claim
158 words
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.
Claim 3
Dependent Claim
26 words
The communication system of claim 1 further comprising an optical amplifier for amplifying said optical signal before it is emitted from said second optical communication antenna.
Claim 4
Dependent Claim
22 words
The communication system of claim 1 further comprising an optical amplifier for amplifying optical signals received by said first optical communication antenna.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-02-19 | 1999-08-21 | 2000-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-02-19 | 2003-08-21 | 2004-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-02-19 | 2007-08-21 | 2008-02-20 | $7700.00 | Window Closed / Lapsed |