JPH0456927A - Data transmitter - Google Patents

Abstract

PURPOSE:To increase the transfer speed and to reduce noises by employing optical transmission instead of electric transmission. CONSTITUTION:According to the reference signal supplied from a synchronizing signal generator 4, voltage applying device 6 and 7 apply voltages for varying an electric field continuously, and the light refractive indexes of light reflecting units 1 and 2 also vary continuously in order according to the reference signal. Consequently, a switching function for selecting one light data among light parallel data or serial data which are already inputted is provided. Plural parallel data which are inputted from branch transmission lines (a) - (d) are divided with time and multiplexed continuously to a trunk transmission line 5, and time-divided multiplexed serial data transferred from the trunk transmission line 5 is reconverted into parallel data, which are sent out to branch transmission lines (e) - (f). Consequently, the transfer speed is increased and noises are reducible.

Description

[Detailed description of the invention] Industrial application field The present invention (Friend)
The present invention relates to a data transfer device suitable for high-speed transfer.

Conventional technology A method of transferring multiple parallel data ζ Originally, a transfer device as shown in FIG. 4 was used as registers 8 and 9.
, 10. Parallel data 16,
1? , 18.19 are input, and the shifter 7 consisting of registers 12, 13, 14.15 connected to the shifter 6 via the signal line 40 outputs parallel data again. At this time, shifter 6.7 is used to ensure that parallel-to-serial and serial-to-parallel conversion of data is performed correctly.
To! A synchronizing signal generator 4 is connected. Immediately multiple parallel data (top) are captured into the shifter 6 according to the reference signal sent from the synchronization signal generator 4. At this time, data 16 is first captured and latched into the register 8, and then the data is processed in accordance with the reference signal. Data 17 is taken in. At this time, the latched data 16 is shifted to register 9. Data 17 is latched into register 8. Similarly, data is shifted in order, and when data 16 reaches register 11, Then, data is sent out for the first time.With this mechanism, multiple parallel data are time-divided, multiplexed, and transferred as serial data.

The serial data multiplexed in this way is transferred to the shifter 7 via the signal line 40, and the received data 16 is first transferred to the register 12 while being synchronized with the reference signal when the shifter 6 takes in the data. It's crowded. Next, in the same way, data 16 is transferred to register 1 according to the reference signal.
The data 17 shifted to 3 is taken into the register 12. This mechanism is repeated until the row (X) data fills shifter 7, and these multiplexed and transferred serial data are simultaneously sent out from shifter 7.
The problem that the invention attempts to solve is to convert the data back into parallel data. However, the problem with this method is that as the number of data transmission paths increases and the amount of data becomes large, it becomes difficult to convert the data into parallel data. The number of register stages must be increased according to the number of data, which functions as a shifter that multiplexes data and converts it into serial data, or reconverts serial data into parallel data. Increasing 1, shifter 6
Alternatively, it takes time for the shifter 7 to be filled, and the mechanism of this data transfer device slows down the transfer speed, resulting in limitations from structural or speed aspects when sending a large amount of parallel data. It's time to solve the above structural modification and speed problem! Even if the number of data transmission lines increases, the structure of the data transfer device itself does not need to be changed, and the transfer speed increases. Furthermore, data transfer is aimed at reducing mold and noise problems that often occur in electrical transmission. It is an object of the present invention to provide a device having an electro-optic effect. a main optical transmission line provided with a second optical refraction element at both ends; a plurality of first branch optical transmission lines provided on the opposite side of the main optical transmission line of the first optical refraction element; and the second optical refraction element. a plurality of second branch optical transmission lines provided on the opposite side of the main optical transmission line; a first voltage application device that applies a voltage to the first photorefractive element; and a first voltage application device that applies a voltage to the second photorefraction element. a second voltage application device; synchronizing the voltage that the first voltage application device applies to the first photorefractive element and the voltage that the second voltage application device applies to the second photorefraction element; 1 converts first optical parallel data inputted into the optical refraction element into serial data by the first optical refraction element; and converts the serial data inputted into the second optical refraction element into second optical parallel data by the second optical refraction element. This data transfer device is characterized in that it converts

Effect of the present invention With the above-described configuration, it is possible to increase the transfer speed by using optical transmission instead of electrical transmission, and by using optical transmission, it is possible to solve the problems that often occur in electrical transmission. The problem of noise can be reduced by U.

Furthermore, the above-mentioned photorefractive elements utilize the electro-optic effect, that is, the property that the optical refractive index changes in response to changes in the electric field. , it is only necessary to increase the setting of the voltage value that determines the value of the electric field for changing the optical refractive index, and there is no need to change the device structure. As mentioned above, by only setting the voltage value that determines the electric field value, the number of optical parallel data transmission lines on the first branch transmission line side and the transmission of optical parallel data on the second branch transmission line side can be changed. It is possible to adjust the number of paths.

Embodiment (Embodiment 1) FIG. 1 is a block diagram of an embodiment of the present invention in which an optical fiber cable is used as the trunk optical transmission line for transfer. The photorefractive elements 1 and 241, which will be explained below with reference to the figures, have an electro-optic effect in which the optical refractive index changes in response to changes in the electric field. Therefore, by making it possible to change the electric field based on a certain reference signal, it is possible to continuously change the optical refractive index of the photorefractive element 1.2. As a material for elements! , K D P (pot
assium dihydrogen phosphor
te), LiTaO5, LiTaO5 vibration In addition to having a large electro-optical effect and a low half-wave voltage, it is advisable to use a material that has small temperature dependence and can easily obtain an optically uniform crystal.% 4 is a sine wave. This is a synchronization signal generator that generates. The voltage application device 6.7 is the synchronization signal generator 4
to take in the sine waves generated by the photorefractive elements 1 and 1, respectively.
2, and the applied voltages are synchronized. In this embodiment, there are four first branch optical transmission lines input to the optical refraction element 1 (transmission lines a to d).
Four cases (transmission lines e to h) are shown as second branch optical transmission lines to which a power is transmitted from the light refraction element 2.

As shown in FIG. 5 and Table 1, the synchronization signal generator 4 operates at time t1. t e, t 3. At time t4, the potentials are v+, V2, respectively. Indicates V L V a. According to the respective potentials of the synchronizing signal generator 4, the voltage applying device 6 applies V+, V2, .
Apply voltages Vs and V4. As the applied voltage changes, the electric field changes in the photorefractive element 1, and for each of the applied voltages, n 1 + n 2 , ng ,
In this case, the photorefractive element I G&
For a plurality of optical parallel data 1 to 4 input in the same direction and at constant horizontal intervals, as shown in Table 1, when the refractive index is n1, the data l of the branch transmission line a is transferred to the main transmission line. When the refractive index is n2, data 2 from the branch transmission line is sent to the main transmission line 5.
fiber optic cable. Similarly, as the refractive index changes (\) By sequentially sending data to the main transmission line 5, parallel data 1 to 4 are time-division multiplexed, converted to serial data, and transmitted (see Table 2).
.

Table 2 Table 3 Table 4 - Person As shown in FIG. 6 and Table 3, the synchronization signal generator 4 is operated at time t 6. t a, t 7. When t s, the potential V6. V6. V? , V
According to each potential of this synchronizing signal generator 4, voltage applying device 7 is synchronized with voltage applying device 6 which generates a reference signal for changing the electric field of photorefractive element l! For the photorefractive element 2, Vs, Ve, V? , Ve are applied to the photorefractive element 1 by the voltage applying device 6. In other words, the voltages V+, V2 . Va, V4, and the voltages Vε, V6 . applied by the voltage application device 7 to the photorefractive element 2. V
? , V8 are synchronized, the electric field changes in t, X, and photorefractive element 2 as the applied voltage changes. It shows the refractive index of no. At this time, with respect to the serial data multiplexed by the optical refractive element 2 (Y) and transferred via the main transmission line 5, the refractive index n5 is determined as shown in Table 4.
When , data 1 transferred from the main transmission line 5 is sent to the branch transmission line e, and when the refractive index is nθ, data 2 is sent to the branch transmission line f. The same goes for the following steps.In order to synchronize the time-divided data and the timing at which the refractive index changes. reconvert to parallel data.

According to the reference signal supplied from the synchronization signal generator 4, the voltage application devices 6 and 7 continuously apply a voltage to change the electric field.
．． The optical refractive index of 2 also changes sequentially and continuously according to this reference signal.
Alternatively, it will have a switching function to select one optical data from serial data. In addition, as mentioned above, this switching function operates continuously based on the reference signal supplied from the synchronization signal generator 4, so that multiple parallel data manually input from the branch transmission lines a to d are time-divided. , multiplexing the data that is continuously sent to the main transmission line 5, and reconverting the multiplexed serial data transferred from the main transmission line 5 to parallel data and sending it to the branch transmission lines e to f. becomes possible.

(Embodiment 2) Hereinafter, an embodiment of the present invention will be described in which the number of optical parallel data transmission lines on the first branch transmission line side and the number of optical parallel data transmission lines on the second branch transmission line side are adjusted. This will be explained with reference to the figures. Figure 2 shows that after data is transferred using an optical fiber cable as the main optical transmission line in the present invention, the number of transmission lines on the second branch transmission line side is reduced by half.
Figure 3 shows the block diagram when the number of transmission lines on the second branch transmission line side is doubled after the optical fiber cable is used as the main optical transmission line in the present invention. It is a block diagram.

In FIGS. 2 and 3, parts having the same functions as those shown in FIG. 1 are given the same numbers, and detailed explanation thereof will be omitted.

In FIG. 2, a light refractive element l
Data 1 on the branch optical transmission line a to data 4 on the branch optical transmission line d are time-multiplexed and sent to the main transmission line 5 as serial data.

Then, the optical refraction element 2 sends out this serial data as parallel data from the branch optical transmission line e + g.

On the other hand, as shown in Figure 6 and Table 3? - Synchronous signal generator 4 (at times ts and tv, potentials VS and V, respectively)
? According to the respective potentials of the synchronizing signal generator 4, the voltage applying device 20ζ applies voltages V B and V v to the photorefractive element 2. As the applied voltage changes, the electric field changes in the photorefractive element 2, and it exhibits a refractive index of nLnv for each of the applied voltages. For the serial data transferred via the main transmission line 5, when the refractive index is n6, data 1 and 2 are sent to the branch transmission line e.When the refractive index is n7, data 3.4 is sent to the branch transmission line g. In other words, in the case of Example 1 (Y4
Parallel data are transmitted to the photorefractive element 1 at a time t
1. t2. Switching at t a, t 4 and serializing L time t s in the photorefractive element 2,
Te, t? .

In the case of Fig. 2, the number of transmission lines is reduced by performing only two switchings at time t6.t? in photorefractive element 2. In other words, the voltages V+, V2.Vs, Vt that the voltage applying device 6 applies to the photorefractive element 1 and the voltages "l/s, Vv that the voltage applying device 20 applies to the photorefractive element 2.

Even if Vs and Vy are synchronized, as shown in FIG. 3, data I on the branch optical transmission line a to data 4 on the branch optical transmission line d are still timed by the optical refraction element 1 in exactly the same way as in the first embodiment. The separated document 1 is multiplexed and sent to the trunk transmission line 5 as serial data. Then, the optical refraction element 2 sends out this serial data as parallel data from the branch optical transmission line e-1.

-X As shown in FIG. 7 and Table 5, the synchronizing signal generator 4
s + t e + t 1s + t ++, t
12, the potential VJV8. V? , V8. V9
, vl・, V ++, V 1e. According to the respective potentials of this synchronizing signal generator, the voltage applying device 30 applies Vs, Ve, V? to the photorefractive element 2. ,
Apply voltages Ve, Ve, Vll, Vll, and V12. As this applied voltage changes, the temperature increases
Then, the electric field changes, and for each of the applied voltages,
The refractive index of n5 to n12 is shown. At this time, the light refractive element 2 (
In this case, for the serial data multiplexed by the optical refraction element 1 and transferred via the main transmission line 5,
No. 7 @ With the correspondence as shown in Tables 5 and 6, the refractive index n
As the data changes from 6 to n12, each data is sent to the branch transmission line e-1. In other words, in the case of FIG. 3 (in the light refractive element 2, the times ts, ts,
t v, te other number 2 Le, t +s, t
By setting ++, t r2 and increasing the number of switching times to 8, the number of transmission lines is increased. That is, the voltages V+, V2 . V3. V4, the voltage (V6.Ve) that the voltage application device 30 applies to the photorefractive element 2, (V?,
Ve) (Vll, Ve9) and (Vll, Ve2) are respectively synchronized. (Space below) Table 5 Table 6 (Space below) After the serial data multiplexed in this way is transferred through the main optical transmission line 5, the light refraction element 2 is connected to the synchronization signal generator 4 in the same way as the light refraction element 1. The technique of synchronizing the switching with the reference signal of the photorefractive element 1. In the photorefractive element 2, using the same principle as in the case of the photorefractive element 1 described above, voltage is continuously applied to change the electric field. ＼ causes a change in the optical pressure refractive index. During this time, the optical refractive element 1 multiplexed data by changing the refractive index the same number of times as the number of parallel data transmission lines on the first branch transmission line side.
For serial data multiplexed in a time-division manner, the number of switching times is a divisor of the number of the second branch transmission paths (the second
2 times in the figure), as shown in Figure 2! M) Convert the data into data with a reduced number of transmission lines on the second branch transmission line side, or change the number of switching times to a multiple of the number of transmission lines on the first branch line (8 in Figure 3).
By increasing the number of transmission lines on the second branch transmission line side as shown in Figure 3, the data is converted to data in which the number of transmission lines on the second branch transmission line side is increased. From the above, by changing the number of transmission lines on the second branch optical transmission line side, it is possible to achieve data dispersion (f) or integration. In Example 1.2, the synchronization signal generator may generate a periodic function such as a triangular wave generated by a sine wave, and the same effect can be obtained.

Effects of the Invention As described above, the present invention can be used to multiplex and transfer multiple parallel data and restore the serial data to parallel data without changing the structure of the device as the number of transmission lines increases. By combining the present invention, it is possible to configure a network system that handles a large amount of data, and in such a system, data can be distributed freely with fewer signal lines, It has the effect of being able to handle high speeds while organizing things.

[Brief explanation of the drawing]

FIG. 1 shows a second block diagram of an embodiment of a parallel-serial-parallel conversion data transfer device using an optical fiber cable as the trunk optical transmission line in the present invention.
The figure shows the third block doctor when the number of transmission lines on the second branch transmission line side is reduced to one half after data is transferred using an optical fiber cable as the main optical transmission line in the present invention.
The figure shows a block diagram when the number of transmission lines on the second branch transmission line side is doubled after data is transferred using an optical fiber cable as the main optical transmission line in the present invention. Blocks of conventional parallel conversion data transfer equipment @ Figures 5 and 6 show the relationship between time and potential of the reference signal sent from the synchronizing signal generator to the applied voltage device. Figure 7 shows the synchronizing signal generator. This is a reference signal sent to the applied voltage device from 1.2...light refractive element, 4... synchronization signal. generator
5... Trunk line transmission 1%, 6,7.20.30...
Voltage application device a~1... Name of branch line senior sending agent Patent attorney Shigetaka Awano Hakaichi Meishiro

Claims (3)

[Claims] (1) A main optical transmission line having first and second light refractive elements having an electro-optic effect at both ends, and a plurality of first branch lines provided on the opposite side of the main optical transmission line of the first light refractive element. an optical transmission line, a plurality of second branch optical transmission lines provided on the opposite side of the main optical transmission line of the second optical refraction element, and a first voltage application device that applies a voltage to the first optical refraction element; a second voltage application device that applies a voltage to the second photorefraction element; the first voltage application device applies a voltage to the first photorefraction element; and the second voltage application device applies a voltage to the second photorefraction element. By synchronizing the applied voltage, the first optical parallel data input to the first optical refractive element is converted into serial data by the first optical refractive element, and the serial data input to the second optical refractive element is converted into serial data by the first optical refractive element. A data transfer device characterized in that data is converted into second optical parallel data by a second optical refraction element. (2) A data transfer device characterized in that the second optical parallel data according to claim 1 is the same as the first optical parallel data. (3) The second optical parallel data according to claim 1 is different from the first optical parallel data, and when N first branch optical transmission lines are provided, the second branch optical transmission line is a multiple of N, or A data transfer device characterized in that the number of lines is approximately several.