CA2122644C

CA2122644C - Optical bus transmission method and transmitting-side encoder and receiving-side decoder therefor

Info

Publication number: CA2122644C
Application number: CA002122644A
Authority: CA
Inventors: Takeo Kaharu; Masato Shimamura; Yuzo Kohsaka; Shuichi Aihara; Kousuki Maezawa; Mitsuru Koike
Original assignee: Japan Aviation Electronics Industry Ltd
Current assignee: Japan Aviation Electronics Industry Ltd
Priority date: 1990-06-22
Filing date: 1991-06-19
Publication date: 1997-09-09
Anticipated expiration: 2011-06-19
Also published as: CA2122644A1

Abstract

The present invention relates to an optical bus transmission method wherein each terminal connected to an optical bus produces a narrow pulse synchronized with the rise of a leading pulse of a second one of first and second Manchester-biphase digital electric signals, a narrow pulse synchronized with the rise of each pulse of the first digital electric signal and a narrow pulse occurring every fixed period of time during the duration of each pulse. The method is comprised of a step wherein the narrow pulses are converted into optical signals and transmitted as an optical pulse train to the optical bus, and a step wherein each terminal converts an optical pulse received from the optical bus into an electric pulse signal. The method further includes a step wherein the electric signal is separated into its leading pulse and subsequent pulses. Each of the subsequent pulses is converted into a pulse of a pulse width equal to the fixed period of time to regenerate the first digital electric signal and the second digital electric signal is regenerated from a polarity-inverted version of the regenerated first digital electric signal and the leading pulse.

Claims

Claims:

1. 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.

2. 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 electric signal is polarity inverted to produce a regenerated second digital electric signal.

3. 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.

4. 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 of said optical bus and optical signals are received from said first and second buses via said first and second optical couplers, respectively.