US5274673A
Expired / Lapsed
US
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Optical bus transmission method and transmitting-side encoder and receiving-side decoder therefor
Assignee: Japan Aviation Electronics Industry Ltd
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Filing: 1992-11-09
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Granted: 1993-12-28
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Expires: 2012-11-09
Abstract
Abstract In each terminal connected to an optical bus a narrow pulse synchronized with the rise of a pre-synchronizing pulse appended to the head of the one digital signal TXN of Manchester-biphase signals, a narrow pulse synchronized with the rise of each pulse of the other Manchester-biphase digital signal TXO and a narrow pulse occurring every fixed period of time during the duration of each pulse are produced, and these narrow pulses are converted into optical signals, which are provided as an optical pulse train to the optical bus. In each terminal optical pulses received from the optical bus are converted into an electric signal, which is separated into its leading pulse and the subsequent pulses, a synchronizing pulse is produced in synchronization with the leading pulse, the subsequent pulses are each converted into a pulse of a fixed width to regenerate the signal TXO, and the regenerated signal TXO is polarity inverted and then combined with the pre-synchronizing pulse to regenerate the signal TXN.
Inventors
- 👤 Takeo Kaharu
- 👤 Masato Shimamura
- 👤 Yuzo Kohsaka
- 👤 Shuichi Aihara
- 👤 Kousuke Maezawa
- 👤 Mitsuru Koike
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 19:56
CPC Classifications
H; H04; H04L; H04L25/00; H04L25/38; H04L25/40; H04L25/49; H04L25/4904
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
201 words
An optical bus transmission method wherein each terminal connected to an optical bus produces a series of narrow pulses a leading one of which is synchronized with the rise of a leading one of pulses of a second of first and second digital electric signals of Manchester-biphase codes, the others of which are synchronized with the rises of pulses of said first digital electric signal and those occurring every fixed period of time during the durations of the pulses of said first digital electric signal, said method comprising: a step wherein a series of said narrow pulses are converted into optical signals and transmitted as an optical pulse train to said optical bus; a step wherein said each terminal converts an optical pulse received from said optical bus into an electric pulse signal; and a step wherein said electric pulse signal is separated into its leading pulse and subsequent pulses, each of said subsequent pulses is converted into a pulse of a pulse width equal to said fixed period of time to regenerate said first digital electric signal and said second digital electric signal is regenerated from a polarity-inverted version of said regenerated first digital electric signal and said leading pulse.
Claim 2
Dependent Claim
201 words
An optical bus transmission method wherein each terminal connected to an optical bus produces a series of narrow pulses a leading one of which is synchronized with the rise of a leading one of pulses of a second of first and second digital electric signals of Manchester-biphase codes, the others of which are synchronized with the rises of pulses of said first digital electric signal and those occurring every fixed period of time during the durations of the pulses of said first digital electric signal, said method comprising: a step wherein a series of said narrow pulses are converted into optical signals and transmitted as an optical pulse train to said optical bus; a step wherein said each terminal converts an optical pulse received from said optical bus into an electric pulse signal; and a step wherein said electric pulse signal is separated into its leading pulse and subsequent pulses, each of said subsequent pulses is converted into a pulse of a pulse width equal to said fixed period of time to regenerate said first digital electric signal and said second digital electric signal is regenerated from a polarity-inverted version of said regenerated first digital electric signal and said leading pulse.
Claim 3
Dependent Claim
224 words
An optical bus transmission method wherein each terminal connected to an optical bus produces a series of narrow pulses the leading two of which are synchronized with the rise and fall of a leading pulse of a first one of first and second digital electric signals of Manchester-biphase codes, the others of which are synchronized with the rises of pulses of said first digital electric signal subsequent to said leading pulse thereof and those occurring every fixed period of time during the durations of said subsequent pulses, said method comprising: a step wherein a series of said narrow pulses are converted into optical signals and transmitted as an optical pulse train to said optical bus; and a step wherein said each terminal converts an optical pulse received from said optical bus into an electric pulse signal, separates said electric pulse signal into two leading pulses and subsequent pulses, a first pre-synchronizing pulse rising and falling in synchronization with said two leading pulses is produced, said subsequent pulses are each converted into a pulse of a width equal to said fixed period of time and is regenerated as said first digital signal in combination with said first pre-synchronizing pulse to produce a regenerated first digital electric signal, and said regenerated first digital electric signal is polarity inverted to produce a regenerated second digital electric signal.
Claim 4
Dependent Claim
224 words
An optical bus transmission method wherein each terminal connected to an optical bus produces a series of narrow pulses the leading two of which are synchronized with the rise and fall of a leading pulse of a first one of first and second digital electric signals of Manchester-biphase codes, the others of which are synchronized with the rises of pulses of said first digital electric signal subsequent to said leading pulse thereof and those occurring every fixed period of time during the durations of said subsequent pulses, said method comprising: a step wherein a series of said narrow pulses are converted into optical signals and transmitted as an optical pulse train to said optical bus; and a step wherein said each terminal converts an optical pulse received from said optical bus into an electric pulse signal, separates said electric pulse signal into two leading pulses and subsequent pulses, a first pre-synchronizing pulse rising and falling in synchronization with said two leading pulses is produced, said subsequent pulses are each converted into a pulse of a width equal to said fixed period of time and is regenerated as said first digital signal in combination with said first pre-synchronizing pulse to produce a regenerated first digital electric signal, and said regenerated first digital electric signal is polarity inverted to produce a regenerated second digital electric signal.
Claim 5
Dependent Claim
30 words
The optical bus transmission method of claim 1 or 2, wherein said narrow pulses each have a width which is less than one-fourth of one bit of said Manchester-biphase codes.
Claim 6
Dependent Claim
53 words
The optical bus transmission method of claim 1 or 2, wherein said optical pulse train from said each terminal is provided via first and second optical couplers to both of first and second buses and optical signals are received from said first and second buses via said first and second optical couplers, respectively.
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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) | 1996-12-27 | 1997-06-28 | 1997-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-12-27 | 2001-06-28 | 2001-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-12-27 | 2005-06-28 | 2005-12-28 | $7700.00 | Window Closed / Lapsed |