JPH0370940B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is applicable to office workstations (hereinafter referred to as
This paper relates to improvements to optical bus repeaters for optical bus networks used for e-mail, etc. between networks (referred to as WS).

An optical bus network having an optical bus repeater will be described below.

FIG. 3 is a block diagram showing the configuration of an optical bus network.

In the figure, 1 to 5 are optical outlets, 6 to 10 are workstations WS, 11 is an optical bus repeater, and 12 is a folding connector.

In the optical bus network, a single unidirectional transmission optical fiber cable is folded back by a folding connector 12 to provide upstream and downstream optical signal lines.

Each WS is connected to the optical bus via non-powered optical outlets 1 to 5 so that the transmitted optical signal always goes on the up line once, and is connected to the powered optical bus repeater 11. The received optical signal is then passed from the down line to each WS via the optical outlets 5 to 1.

That is, optical signals are always transmitted and received via the folding connector 12.

The optical bus repeater 11 has a power supply and performs regenerative repeating of uplink and downlink optical signals.

Optical outlets 1 to 5 do not have a power supply and are used to connect the trunk optical fiber cable and the optical fiber cable from the WS and add/drop optical signals. It consists of an optical connector for connecting to the mold and a half mirror for passing or branching and inserting optical signals.

In the optical bus repeater 11, when the power is off,
Bidirectional communication is possible on the side of the optical bus network with the folding connector 12, but on the side without the folding connector 12, input signals are folded back and bidirectional communication is possible in a small-scale network. It is hoped that this will be possible.

[Conventional technology]

FIG. 4 is a block diagram showing the configuration of a conventional optical bus repeater.

In the figure, 13 and 14 are connectors, 15 and 16 are opto-electric converters, 17 and 18 are regeneration circuits, and 19 and 20 are electro-optic converters.

A conventional optical bus repeater is configured as shown in FIG.
The signal is reproduced by the reproducing circuit 17, converted into an optical signal by the electro-optic converter 19, and transmitted through the optical connector 14.

The optical signal from the down line passes through the optical connector 14 and is converted into an electrical signal by the opto-electrical converter 16.
The signal is reproduced by the reproducing circuit 18, converted into an optical signal by the electro-optic converter 20, and transmitted through the optical connector 13.

[Problem that the invention seeks to solve]

However, in conventional optical bus repeaters, the third
When the power to the optical bus repeater 11 shown in the figure is turned off, the right and left buses are separated at the optical bus repeater 11 as a boundary, and the system is configured only on the side with the folding connector 12, allowing bidirectional communication. but,
On the other side, there is a problem that two-way communication is not possible because there is no folding part.

[Means for solving problems]

The above problem is that each workstation WS6 to WS10 has no separate drive power supply for upstream and downstream directions.
Connector 1 that connects and transmits the optical signal from the optical bus to the optical bus and returns the upstream signal to the downstream signal at the end of the transmission line.
2, the drive power supply converts the optical signal into an electrical signal (O/E) and converts the reproduced electrical signal back into an optical signal (E/O). In the optical bus repeater 11 that outputs the optical bus, the mechanical support direction is determined by each control voltage generated from the drive power source on the input side and the output side of the optical bus repeater, and the direction of mechanical support is determined by the control voltages generated from the drive power supply on the input side and output side of the optical bus repeater. Optical switches 21 and 22 are provided that totally reflect the input light in the event of a failure, and in the event of a failure in which the power of the optical bus repeater is cut off, the optical switches totally reflect the input light and reflect the input light between the input and output sides of the optical bus repeater. The solution is provided by the optical bus repeater of the present invention, in which each workstation 6-8; 9, 10 is configured to communicate separately.

[Effect]

According to the present invention, when the power of the optical bus repeater is turned off, the optical switch for folding back the optical signal is operated and the optical signal on the side without the folding connector is folded back, so that even the side without the folding connector can be folded back. The system will be configured and will be able to communicate in both directions.

〔Example〕

FIG. 1 is a block diagram showing the configuration of an optical bus repeater according to an embodiment of the present invention, and FIG. 2 is a block diagram showing the configuration of a self-restoring optical switch as an example of an optical switch.

In the figure, 21 and 22 are optical switches, 23 is a switch control section, 24 and 27 are optical connectors, and 28 is a trapezoidal prism, and the same reference numerals indicate the same functions throughout the figures.

The difference between FIG. 1 and FIG. 4 is that optical switches 21 and 22 are provided on the input/output side, and a switch control section 23 is provided that controls the optical switches 21 and 22 in conjunction with the on/off of the power supply. be.

In this way, when the power is turned off, under the control of the switch control unit 23, the optical switch 21 totally reflects the input light by changing the installation direction of the trapezoidal prism 28, and the light from the upstream line is reflected. Since the signal can be switched to be looped back, the side without the loopback connector 12 in Fig. 3 is also looped back, and a system is configured on the left side of the optical bus repeater 11, and two-way communication is possible within this system. You will be able to do it.

The optical switch 22 is designed to fold back the right side of the optical bus repeater, and in this case it may be left inactive.

Next, an example of a self-resetting optical switch used for the optical switches 21 and 22 will be explained using FIG. 2. When the power is turned on, the trapezoidal surface of the trapezoidal prism 28 is installed in a direction close to perpendicular to the plane of the paper. Uplink optical signals are sent through optical connectors 24 and 25, and downlink optical signals are sent through optical connectors 27 and 26.
It is sent through through the process.

When the power is turned off and a control signal is received from the switch control unit 23, the trapezoidal surface of the trapezoidal prism 28 becomes parallel to the paper surface, and the optical signal from the upstream line is totally reflected within the prism and folded in the direction of the downstream line. It will be returned.

By doing the above, even if the power to the optical bus repeater is turned off, even on the side without the loopback connector,
A small-scale system is constructed with optical bus repeaters as boundaries, and bidirectional communication becomes possible within the system.

〔Effect of the invention〕

As explained in detail above, according to the present invention, even if the power to the optical bus repeater is turned off, the side with the folding connector remains the same, and the small-scale system bordering on the optical bus repeater remains intact even on the return side. This has the effect of enabling communication within the system.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of an optical bus repeater according to an embodiment of the present invention, and FIG. 2 is a block diagram showing the configuration of a self-restoring optical switch as an example of an optical switch.
FIG. 3 is a block diagram showing the configuration of an optical bus network, and FIG. 4 is a block diagram showing the configuration of a conventional optical bus repeater. In the figure, 1-5 are optical outlets, 6-10
is a workstation, 11 is an optical bus repeater, 1
2 is a folding connector, 13, 14, 24-27
is an optical connector, 15 and 16 are photoelectric converters, 1
7 and 18 are reproducing circuits, 19 and 20 are electro-optical converters, 21 and 22 are optical switches, 23 is a switch control section, and 28 is a trapezoidal prism.

Claims (1)

[Claims] 1 A cascade system having a connector 12 that connects and transmits optical signals from each workstation 6 to 10 to an optical bus in the upstream and downstream directions separately without a driving power source, and returns the upstream signal to the downstream signal at the end of the transmission path. It is installed in the middle of multiple optical outlets 1 to 5 and converts optical signals into electrical signals using a driving power source (O/E).
Convert the regenerated electrical signal back into an optical signal (E/
In the optical bus repeater 11 that outputs the optical bus, the mechanical support direction is determined by each control voltage generated from the drive power source on the input side and the output side of the optical bus repeater, and normally the input light is passed through. Optical switches 21 and 22 are provided that totally reflect the input light in the event of a power outage failure, and in the event of a power outage failure of the optical bus repeater, the optical switch totally reflects the input light and connects the input light to the input side of the optical bus repeater and the output. Each workstation on the side 6~
8; An optical bus repeater characterized in that 9 and 10 communicate separately.