JPS6315541A - optical transmission system - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an optical transmission system that transmits and receives optical signals in parallel between optical transmission devices.

[Conventional technology]

Figure 2 shows, for example, a data transmission system described in a catalog [Mitsubishi Plant Control Dataway (MDWS-500 System), published in 1983].
10 is an optical transmission device as a station capable of optically receiving transmission optical signals, and 11 is an optical transmission line connecting a large number of optical transmission devices 10 in series in a loop according to the relationship of optical attenuation. It is. The stations are 5TN1.5TN2. ...e STN
It is assumed that there are only n pieces of n.

FIG. 3 is a block diagram showing the detailed configuration of the optical transmission equipment 1o shown in FIG. 2. In the same figure, 11a, ll
b is a part of the optical transmission line 11, which is connected to the transmitting side and the receiving side of the optical transmission device 1°, respectively, and the terminals are connected to the transmission lines 11a and llb for both parties for 101 Fi transmission and reception, and are used for control. A 4-terminal bypass type optical switch that can be switched to one optical path for bypass or two optical paths for transmitting and receiving light according to an electric signal. A photoelectric converter 104 receives light at a light receiving section, and a light emitting section is connected to an optical fiber 103.
an electro-optical converter connected to the other terminal of the bypass type optical switch via b and converting an input electrical signal into an optical signal, 105;
controls the bypass type optical switch 101, and the photoelectric converter 1
This is a transmission/reception control device that inputs a photoelectric conversion signal from 02 as a reception signal and outputs a transmission signal to the electro-optical converter 104.

Next, the operation will be explained. When the optical transmission device 10 is normal, the bypass type optical switch 101 connects one optical transmission line 1
1b and the input end of the optical fiber 103a, and the input end of the other optical transmission line 11a and the optical fiber 103b.
The state is switched to the state shown in the figure so as to optically couple the output terminals of the two. An optical signal transmitted from one master station in the optical transmission device 10 is transmitted from the transmission path 11b to the bypass type source switch 1.
01-through optical fiber 103a, photoelectric converter 102
The signal is then photoelectrically converted and input to the transmission/reception control device 105. The electrical signal processed by the transmission/reception control device 105 is converted into an optical signal by the electro-optical converter 104, and propagates through the optical transmission line 11a via the optical fiber 103b and the bypass type optical switch 101, and is transmitted to the next optical signal. It is sent to the transmission device 10. In this way, optical signals sent from the master station are sequentially sent to the optical transmission device 10 via the optical transmission line 11.

For example, if an abnormality occurs in a certain optical transmission device 10 due to a failure of the transmission/reception control device 105, the optical transmission device 1
0 bypass type optical switch 101 is the optical transmission line 11a,
llb are switched to optically couple each other, and the optical signal is directly passed through the bypass type optical switch 101 from the optical transmission line 11b.
and is transmitted to the next optical transmission device 10 via the optical transmission line 11a.

[Problem that the invention seeks to solve]

Conventional optical transmission systems are configured as described above, so when a certain station goes down due to a failure, etc., the bypass type optical switch of the downed station is switched to bypass mode to prevent the system from going down. Since this bypass type optical switch requires time to switch, there are problems such as synchronization disturbances in the transmission time of signals throughout the system due to the switching time.

This invention was made to solve the above-mentioned problems, and aims to provide an optical transmission system in which the entire system is not affected even if a certain station goes down due to a failure or the like.

[Means for solving problems]

The optical transmission system according to the present invention collects the optical outputs of a plurality of optical transmission devices through an Nfi5 optical transmission line, converts these optical outputs into electrical signals using a plurality of photoelectric converters, and converts them into 0R signals using an OR circuit. , in which the output signal of the OR circuit is converted into optical signals in parallel by multiple electro-optical converters, and these converted optical signals are returned to the receiving side of multiple optical transmission devices via multiple optical transmission lines. It is.

[For production]

The optical transmission system according to the present invention uses an OR circuit to OR the outputs of a plurality of optical transmission devices, and returns the output of this OR circuit to those optical transmission devices as an optical signal, so that received signals can be processed in parallel. Sharing.

〔Example〕

Hereinafter, one embodiment of the present invention will be explained with reference to the drawings. In Fig. 1, parts with the same symbols as in Figs. 2 and 3 are the same parts as in the conventional example, and 1 indicates each transmission side optical transmission line 11a
n photoelectric converters each of which is connected to the transmitting side of each optical transmission device 10 through a light receiving section, 2 is an OR circuit that takes the logical sum of all the outputs of the photoelectric converter 1, and 3 is an OR circuit. There are n electro-optical converters each having the output of the circuit 2 as its input and each output side connected to the receiving side of the six optical transmission devices 10 via the receiving side optical transmission line 11b. 4 is an optical distributor, and symbols 1 to 3
It is composed of the constituent * elements shown in .

Next, the operation of the embodiment jJ of the present invention will be explained. The optical signal sent from the zero-source transmission device ff1o to the optical splitter 4 via the optical transmission line 11a is photoelectrically converted by the photoelectric converter 1, and then subjected to OR. 0Rt- is taken by the circuit 2, then converted into an optical signal by the electro-optical converter 3, and sent simultaneously and in parallel to each optical transmission device 10 via each optical transmission line 11b. Received. In this way, signals can be freely transmitted and received between each optical transmission device 10. Furthermore, even if a certain optical transmission device 10 ';' IJ or station 5TNI goes down, other optical transmission devices 10 (station 5TN2 or later)
The only difference is that the station 5TN1 cannot send and receive signals, and there are no other effects.

In the above embodiment, a bypass type optical switch 101 is used as the optical transmission device 10, as shown in FIG.
1a is the light receiving part of the photoelectric converter 102 and the electro-optical converter 10
4, that is, the receiving side and the transmitting side of the optical transmission device 10, respectively.

〔Effect of the invention〕

As described above, according to the present invention, the output of n stations is
R is connected to an OR circuit, and the output of this OR circuit is sent back to each station as an optical signal, so even if one station goes down due to a failure, the entire optical transmission system is not affected, improving reliability. This has the effect of providing a device capable of high transmission.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an optical transmission system according to an embodiment of the present invention, FIG. 2 is a block diagram of a conventional optical transmission system, and FIG. 3 is a block diagram representative of an optical transmission device. In the figure, 1 is a photoelectric converter, 2 is an OR circuit, 3 is an electro-optical converter, 10 is an optical transmission device, lla is a transmission optical transmission line,
11b is a receiving optical transmission line. In addition, in the figures, the same reference numerals indicate the same or equivalent parts. Patent applicant: Mitsubishi Electric Corporation □h6↓ Agent: Patent attorney Hiroshi Hiroshi Hizawa. (2 other people) IIllll Figure 1: 尤甬电斯 2 2 OR”m# 3 ：＠尤第器lθ：尤7Transmission 恭1 Htl: Yu phase use 尤transmission square ttb', 文A beggar light Yiyun Sho Well No. 21, +01,.

Claims (1)

[Claims] A plurality of optical transmission devices each capable of transmitting and receiving optical signals, a transmission optical transmission line having each input end optically coupled to the transmission side of each of the optical transmission devices, and an output of the transmission optical transmission line. A photoelectric converter that converts each optical signal emitted from each end into each electrical signal, an OR circuit that takes the logical sum of the output of each of the photoelectric converters, and an output signal of the OR circuit that is connected in parallel to each optical signal. 1. An optical transmission system comprising: a plurality of electro-optical converters for converting optical signals; and a reception optical transmission line for optically transmitting optical signals from each of the electro-optical converters to the receiving side of each of the optical transmission devices.