JPS58101536A - Annular optical communication device - Google Patents

Abstract

PURPOSE:To switch the lines easily, by connecting two-core optical fiber cables in cascade through the use of repeaters. CONSTITUTION:An annular optical communication network is formed by connecting two-core optical fiber cables 11, 12 in cascade through the use of repeaters 21, 22. The cable 11 is a major loop forming line and the cable 12 is a substitute. The repeaters 21, 22 are provided with terminals 1-4 for 2-core optical fiber cables and a reception terminal R and a transmission terminal T for a pair of terminal devices. The annular optical communication network is linked to a central processing unit 5 via the repeater 21. In a console 7 where the terminals 1-4 of the repeater 21 are arranged, four mirrors 61-64 having reflecting plates of both surfaces are arranged and the switching of the line is done by locating and eliminating the mirrors suitably.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a ring optical communication device in which two-core optical fiber cables are cascaded using repeaters.

Data is sent and received between the terminal devices and the central processing control unit by connecting multiple terminal devices to a circular optical communication network connected to the central processing control unit using a conventional single-core optical fiber cable. In the ring communication system, data is transmitted between a terminal device connected to the ring communication network and a central processing control unit in seconds by sending data in a fixed direction. Such a ring communication system has the disadvantage that if a signal path is broken or any terminal device malfunctions, data transmission between all the terminal devices and the central processing control unit becomes impossible.

The present invention has been made in view of the above points, and when a break occurs in the signal path between certain terminal devices, the signals are looped back at each terminal device, and when the terminal device fails, the terminal device is bypassed. To construct a new loop and maintain a ring communication network, the ring optical communication device of the present invention is constructed by connecting two-core optical fiber cables in a cascade using a repeater, and a central processing In a ring optical communication device connected to a control device, the repeater has two pairs of optical fiber cable terminals, at least one pair of terminal device transmission/reception terminals, and further a connection/switching means for each of the terminals. has
The optical communication device is a ring-shaped optical communication device in which a terminal device connected to the communication device via the repeater performs two-way data transmission and reception with the central processing control device.

An embodiment of the present invention will be described below with reference to the drawings. 1st
The figure shows an embodiment of the ring optical communication device of the present invention, and FIG. 2 shows the loop connection and connection using a repeater used in the embodiment of FIG.
To explain the switching, explanatory diagrams of the switch unit as a terminal connection switching means in a repeater are shown in Figures 3 and 3).
e) shows an explanatory diagram of the state of the optical switch section in FIG. 2.

The ring optical communication network in the ring optical communication apparatus of the present invention shown in FIG. 1 is formed by cascading two-core optical 7-IPA cables 31.12 using repeaters 21.22.

The optical fiber cable 11 is a main loop forming line, and the optical fiber cable 12 is an alternative loop forming line.

Each repeater 21.22 has two pairs of terminals 1.2, 3.4 for optical fiber cables, and furthermore, the repeater 21 has a pair of receiving terminals R and transmitting terminals T for terminal devices, Further, the repeater 22 includes two pairs of receiving terminals R and transmitting terminals T for terminal devices.

The ring optical communication network thus configured is connected to the central processing control unit 5 via the repeater 2.

In each repeater 21, 22, the receiving terminal R indicates the output terminal of an optical receiving circuit having an internal optical-to-electrical conversion circuit 0/E, and the transmitting terminal T has an internal optical-to-optical converting circuit h.
10 shows an input terminal of an optical transmitter circuit having 10.

Each terminal device 31132.33.34.38.39 is connected to the above-mentioned receiving terminal R and transmitting terminal T via a twisted pair wire cable 15.16, and is connected to the above-mentioned receiving terminal R and transmitting terminal T through a twisted pair wire cable 15. wire cable 15.16
The central processing control unit 5 is connected to the transmitting/receiving terminal of the repeater 21 via the transmitting/receiving terminal of the repeater 21 . According to normal communication, data is transmitted in a fixed direction in the order of terminal devices 31 → 32 → 38 → 39 ... → 33-34 using an optical fiber cable 11 and repeaters 21 and 22 using a time division multiplexing method. It is done.

In this normal state, the state of the optical switch in each repeater 21 is as shown in FIG. 2 or FIG. 3 ←). The optical switch section of each repeater has six terminals 1, 2, 314, R', and T' on the housing 7 of the optical switch section. Terminal 1.
2 are located on the same wall of the enclosure 7, and terminals 3.4 are located on the same wall facing the wall, and the terminals 1.4 are terminals for the optical fiber cable 11 and are optically aligned with each other. They are placed on opposite walls. Also, terminal 2.
Reference numerals 3 denote terminals for the optical fiber cables 12, which are optically aligned with each other, and are arranged on opposite walls. By the way, inside the pressure body 7 of the optical switch part, there are four mirrors 61, 62, 63 on the diagonal of the case 7, which are opposite to each terminal 1° 2. 3. .64 (mirrors 62.63 are not shown in Fig. 2), each fa61.62, 63.64 can move in the direction perpendicular to the plane of the paper in Fig. 2, and each terminal 1
, 2.3.4, the light from each terminal is reflected.

Note that the remaining two terminals R/ and T/ of the housing 7 are connected to the terminal l when the bells 61 and 64 are present, which is a normal communication state.
Terminal R is placed at a position where it can receive the reflected light from the mirror 61.
Furthermore, the terminal T' is arranged such that the terminal 4 is located at a position where it can receive the reflected light from the mirror 64 of the light from the terminal T'.

Terminal R' of the optical switch section is an input terminal to the optical-to-electric conversion circuit 0/E, and terminal T' is an input terminal to the electric-to-optical conversion circuit E10.
This is the output terminal from the light switch section. By the way, the optical transmission path in the ring optical communication network in normal times is from the optical fiber cable 11 to the terminal 1 in the repeater 21 to the mirror 61 to the II terminal R', and is converted to electricity by the optical-to-electrical conversion circuit 0/2. Then, from the receiving terminal R, the wire cable 15 → the terminal device 31 (or 32,..., 33, 34) → the wire cable 16, the terminal T is converted into light by the electrical-optical conversion circuit E10, and the terminal T' → mirror 64→terminal 4−optical fiber cable 11.

In addition, when the terminal devices 38 and 39 are connected radially to a ring optical communication network as in the repeater 22, the connection is not switched by an optical switch, but the optical connectors are connected to each other in the repeater using an optical fiber cord. It may be possible to form any optical path by connecting them.

Further, in the repeater 21, the passage may be formed by an optical fiber cord instead of an optical switch.

By the way, each terminal device 31, 32, . . . 33, 34.
38 and 39 pass through the ring network. It has a synchronization function and a data branch/insertion function, and can send and receive data to and from the central processing control unit.

Next, consider the case where the optical fiber cable 11 forming the main circular optical communication network is disconnected at point A between the repeaters 21 and 21 of the terminal devices 31 and 32, respectively.
By setting the state of the switch section of the repeater 21 of the terminal device 31 to the state where the mirrors 61 and 63 are inserted between the terminals as shown in FIG. 3, the communication line is connected to the optical fiber cable 11.
→ terminal 1 → blunt 61 → terminal R → wire cable 15 → terminal device 31 → wire cable 16 → terminal T → mirror 63 - terminal 2 → optical fiber (formed by cable 12, repeater 2
1, the signal is folded back by an alternative fiber optic cable 12 to form a loop. Furthermore, by changing the state of the switch section of the repeater 21 of the terminal device 32 to the state shown in FIG. As in the case of the device 31, the optical fiber (cable 12 → terminal 3 → mirror 62 →
Terminal R → Wire cable 15 → Terminal device 32 → Terminal 7-
A loop is formed between the four bonds 64 and the optical fiber cable 11, and even if the optical fiber cable 11 is disconnected at point A, each terminal device can send and receive data to and from the central processing control unit 5. Next, if the terminal device 31 fails and
If a point is disconnected, one communication line can be disconnected by placing the switch section of the repeater 21 of the terminal device 31 in a state where mirrors 61 and 62 are inserted between the respective terminals as shown in FIG. 3(C). ,
The optical fiber cable 11 → terminal 1 → mirror 61 → bell 62 → terminal 2 → optical fiber cable 12 bypasses the terminal device 31 and forms a return loop, while the switch section in the repeater 21 of the terminal device 32 is as described above. Data can be transmitted and received by performing the same operation as when point A of the optical fiber cable 11 is disconnected. In addition, if you simply want to bypass 4 any terminal device, you can connect the switch section of the repeater of that terminal device to the terminal of the switch section as shown in Figure 3). It is possible to pinox without repercussions. Furthermore, when bypassing any terminal device and forming a return loop at that location, the switch section of the repeater 21 of that terminal device is
This can be realized by arranging all the mirrors, mirror 61% 116.2, mirror 63, and mirror 64, between each terminal as shown in ).

As is clear from the detailed explanation above, since two-core optical fiber cables are connected in a subordinate manner using a repeater, even if an accident occurs, the circular communication network can be maintained, and the repeater can be connected at least Since it has a connection/switching section with 6 terminals, that is, 2 pairs of optical fiber cable terminals and at least 1 pair of terminal device terminals, line switching operations are extremely simple and restoration of damaged lines is easy. Furthermore, simply by preparing the repeater of the present invention, the ring communication network can be expanded easily and at low cost.

[Brief explanation of the drawing]

FIG. 1 shows an embodiment of the ring optical communication device of the present invention, and FIG. 2 shows the terminal connection and switching in the repeater used in the embodiment of FIG. 1 to explain the loop connection and switching by the repeater. An explanatory diagram of the optical switch unit as a switching means is shown in Figure 3 (
a) to (θ) show state explanatory diagrams of the optical switch in FIG. 2. In the figure, 11. x2a fiber optic cable, 21.
22 is the repeater 1 1% 2% 3% ' is the terminal for the optical fiber cable, R and T are the transmitting and receiving terminals for the terminal device, 5
indicates a central processing control unit. Patent Applicant Dainichi Nippon Electric Cable Co., Ltd. Yukio Aoshiro 160- (Phantom (4) Age 3)

Claims (1)

[Claims] In a ring optical communication device comprising two optical fiber cables connected in a subordinate manner using a repeater and connected to a central processing control unit, the repeater has two pairs of optical fiber cable terminals and at least one pair of optical fiber cable terminals. A transmitting/receiving terminal for a terminal device,
Furthermore, it has connection/switching means for each of the terminals, and a terminal device connected to the ring optical communication device via the repeater performs bidirectional data transmission and reception with the central processing control device. A ring optical communication device characterized by: