JPS6281826A - Optical signal transmission system - Google Patents

Abstract

PURPOSE:To send plural sets of optical information by sending plural optical signals from plural optical signal transmission/reception terminal devices to one optical signal transmission terminal device sequentially in a different timing. CONSTITUTION:When each optical signal transmission/reception terminal device 2 of the subsequent order receives an optical signal S1 from an optical signal transmission/reception terminal 1 of a host processing unit, the transmission/ reception terminal device 2 placed at the leftmost end starts at first the own timer, the processing is finished in the transmission/reception terminal device 2 after a prescribed time and the specific information is sent to the transmission/ reception terminal device 1 as an optical signal. Further, the transmission/ reception terminal device 2 at the 2nd order from the left receives the optical signal S1 and completes the processing at the transmission/reception terminal device 2 after a prescribed time T2 to send the optical signal having the specific information to the transmission/reception terminal device 1. Similarly, the optical signal having the specific information is sent to the transmission/reception terminal device 1 with a delay sequentially by a prescribed time.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to an optical signal transmission system that transmits and receives optical signals between a plurality of optical signal transmitting and receiving terminals.

[Conventional technology]

Figure 3 is a pronk connection diagram of a conventional optical signal transmitter used in field instrumentation systems.
1 is an optical signal transmitting/receiving end belonging to the upper processing device, 2
A plurality of optical signal transmitting/receiving terminals are installed at the plant site, and each of these terminals is provided with optical-to-electrical conversion circuits 1a and 2ap and electrical-to-optical conversion circuits 1b and 2b. 3 is the original star coupler as the original branching/merging element, which is the original-to-electrical conversion circuit 1a,'F! The optical to optical conversion circuit 1b and the electrical to electrical conversion circuit 2a are connected through the original fiber 4.5'i to the electrical to optical conversion circuit 2b.

Next, the operation will be explained.

Now, the electricity at the optical signal transmitting/receiving end 1 and 2 of the host processing device is
When an optical signal is generated in the optical conversion circuit 1b, it is distributed and inputted to the optical signal transmitting/receiving end 20 at the plant site via the original star coupler 32 and the original fibers 4 and 5 to the electrical conversion circuit 2a. On the other hand, when an optical signal such as temperature detection data is generated in the electric-optical conversion circuit 2b of the optical signal transmitting/receiving end 2 at the site, it is transmitted to the optical signal transmitting/receiving end via the original star coupler 3 and the original fibers 5, 4. The signal is input to the element-to-electrical conversion circuit 1a of No. 1, and this becomes the input to the terminal of the higher-level processing device.

[Problems that the invention seeks to solve]

The conventional optical signal transmission method is as above.

When multiple optical signal transmitting/receiving ends 2 each transmit unique information to one optical signal transmitting/receiving end 1, if each optical signal carrying that information is simultaneously transmitted, the upper optical signal transmitting/receiving end 1
There were problems such as confusion in information processing.

This invention was made to solve the above-mentioned problems, and when an optical signal is transmitted from one optical signal transmitting/receiving end, and this optical signal is received by a plurality of other optical signal transmitting/receiving ends, Each of these other optical signal transmitting/receiving ends sequentially delays the unique information by a different time, and sequentially transmits the upper one/to the signal transmitting/receiving end. The aim is to develop an optical signal transmission method that can transmit signals within a certain amount of time without confusion.

[Means for solving problems]

In the optical signal transmission system according to the present invention, from the time when one optical signal transmitting/receiving end transmits an optical signal, each of the other plurality of optical signal transmitting/receiving ends sequentially delays by a different time, and transmits unique information to the one above. The optical signal is transmitted to the transmitting and receiving end.

[Effect]

A plurality of other optical signal transmitting/receiving ends according to the second aspect of the present invention are as follows.

A controller installed in a host processing device, etc.
The timing for transmitting each piece of information is set in advance 2, and multiple pieces of information are sequentially and orderly transmitted to one optical signal transmitting/receiving end in a short time according to the set timing, thereby increasing the information transmission efficiency. 2 and reduce power consumption.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. 1st
In FIG. 2, reference numeral 1 denotes an upper optical signal transmission/reception end on the upper processing device side, which is provided with an optical-to-electrical conversion circuit 1a2 and an electric-to-optical conversion circuit 1b.

2 is a plurality of lower optical signal transmitting/receiving ends on the plant site side;
These are provided with an electric-to-electric conversion circuit 2a2 and an electric-to-conversion circuit 2b. Reference numerals 3a and 3b are original star couplers as branching/merging elements, and the original star coupler 3a distributes the optical signal from the optical signal transmitting/receiving end 1 to each optical signal transmitting/receiving end 2. Further, this original star coupler 3b collects the optical signals from each optical signal transmitting/receiving end 2 into one optical signal transmitting/receiving end 1.

Next, the operation will be explained.

In general, the optical signal generated at the optical signal transmitting/receiving end 1 of a host processing device is a source pulse S1 which is output for each person for a certain period of time, as shown in FIG. 2a. S2..., and this time TA can be set to a different time specific to each optical signal transmitting/receiving end 2 at the site, if necessary.

Now, the original pulse S is transmitted from the optical signal transmitting/receiving end 1 to a plurality of optical signal transmitting/receiving ends 2 via the original star coupler 3ae, and in response, these optical signal transmitting/receiving ends 2 Information unique to the optical signal transmitting and receiving end 1 must be transmitted. Therefore, the operating time of each optical signal transmitting/receiving end 2 must be extremely short.

That is, when the optical signal S1f from the optical signal transmitting/receiving end 1 of the upper processing device is received by each of the lower optical signal transmitting/receiving ends 2, first, the optical signal transmitting/receiving end 2 at the far left in FIG. After a certain period of time T1 as shown in FIG. do. In addition, the optical signal transmitting/receiving end 2 located second from the left in FIG. 1 receives one optical signal S1, and then
As shown in FIG. 2C, after a certain period of time T2, this ″/l
After completing the processing at the signal transmitting/receiving end 2, the optical signal sb having unique information is transmitted to the upper optical signal transmitting/receiving end 1. Thereafter, as shown in FIG. 2 d to FIG. 2 n, the timer of each optical signal transmitting/receiving end 2 is started, and a certain period of time T5.・・・
・The optical signal Sc with unique information is sequentially delayed by Tn.
, . . . Sn are transmitted to the optical signal transmitting/receiving end 1. After the transmission to the upper optical signal transmitting/receiving end 1 is completed in this way.

Optical signal S2 of the next period from this upper optical signal transmitting/receiving end 1
Each optical signal transmitter/receiver 2 does not operate until this occurs.

By performing such an operation, an optical signal from a higher-level optical signal transmitting/receiving end 1 is received, processing is performed at a plurality of lower-ranking optical signal transmitting/receiving ends 2, and an optical signal with unique information is further transmitted into a single optical signal with unique information. Since the time required to transmit the optical signal to the optical signal transmitting/receiving end 1 is extremely short, the power consumption at each optical signal transmitting/receiving end 1 can be suppressed to a low level, and therefore the energy saving effect of the entire system is significant.

〔Effect of the invention〕

As described above, according to the present invention, a plurality of optical signals are sequentially transmitted from a plurality of optical signal transmitting/receiving ends to a single optical signal transmitting end at different timings.
In addition to being able to transmit one piece of information in a short time, it also has the advantage of reducing power consumption and improving durability by shortening the power supply time to the electrical-to-optical conversion circuit at the optical signal transmission end.

[Brief explanation of drawings]

Fig. 1 is a block connection diagram for explaining an optical signal transmission system according to an embodiment of the present invention, Fig. 2 is a time chart of optical signals of each part of the block connection diagram shown in Fig. 1, and Fig. 3 is a conventional FIG. 2 is a block connection diagram of an optical signal transmitter. 1.2 is an optical signal transmitting/receiving end, 1a and 2a are original-to-electric conversion circuits, and 1b and 2b are electric-to-optical conversion circuits. 2. In the figures, the same reference numerals indicate the same or corresponding parts. Patent applicant Mitsubishi Electric Corporation Agent Patent attorney EB# f$ I)E'
-” (2 others) Figure 1 Figure 2

Claims (1)

[Claims] An optical signal is sent from one optical signal transmitting/receiving end to a plurality of other optical signal transmitting/receiving ends, and the other optical signal transmitting/receiving ends that respond to this optical signal transmit information specific to them to the one optical signal receiving end. In an optical signal transmission method that transmits signals at the end,
The unique information from each of the other optical signal transmitting and receiving ends is transmitted to the one optical signal transmitting and receiving end with a sequential time delay from when the optical signal transmitted by the one optical signal transmitting and receiving end is transmitted. An optical signal transmission system that is characterized by: