JPS60121855A - Communication device passing optical fiber - Google Patents

Abstract

PURPOSE:To simplify the structure and to reduce the power consumption by using all data pulses as synchronizing pulses and setting the time width of each pulse to a small value. CONSTITUTION:While only transmission-side synchronizing pulses S are generated but transmission-side data pulses Dt are not generated, only a current I1 passing the first current setting resistance 6 drives a light emitting diode 4, and the diode 4 emits light with a middle intensity. When transmission-side data pulses Dt are generated, a current I2 passing the second current setting resistance 10 is added to said current I1, and the diode 4 emits light with a high intensity. Consequently, when synchronizing pulses St and data pulses Dt are inputted to the transmission side in accordance with signal ''1010'', the light emitting diode 4 emits light while changing the intensity. When the light of the light emitting diode 4 is received by a photodiode 16 in a receiver 3, its resistance value is changed in inverse proportion to the intensity of the received light, and the potential at a voltage dividing point P is changed in direct proportion to the intensity of the light.

Description

[Detailed Description of the Invention] A. Field of Industrial Application This invention provides synchronization pulses of constant intervals from the transmitting side to the receiving side, and is synchronous with each synchronization parnu, and there are times when it occurs and times when it does not. The present invention relates to a communication device that transmits data via an optical fiber. - Prior Art Conventional communication devices using optical fibers transmit the same pulse pulses and data pulses using individual light emitting elements, individual optical fibers, and individual light receiving elements. The disadvantages are that the structure is complicated and the power consumption is large.

OBJECT OF THE INVENTION It is an object of the present invention to provide a notification device using optical fiber, which does not have the above-mentioned drawbacks of conventional communication devices.

23 Configuration of the Invention The configuration of the present invention includes an optical fiber (1) having one end face (1a) on the transmitting side and the other end face (1b) on the receiving side, and a synchronizing pulse on the transmitting side and a data pulse on the transmitting side. This corresponds to three cases: when both occur, when the transmitter synchronization pulse occurs but no transmitter data pulse occurs, and when neither the transmitter synchronization pulse nor the transmitter data pulse occurs. , a transmitter (2) that injects into the one end face of the optical fiber light with seven levels of intensity selectively determined from three levels: strong, medium, weak, or none; and a receiving side. It receives light from the other end surface of the transmitter, detects which of the three cases is occurring according to the intensity level of the light, and based on the detected content, it detects the signal that is simultaneous with the transmitting side synchronization pulse. A communication device via an optical fiber comprising a receiving device (3) for producing a receiving synchronization pulse and a receiving data pulse simultaneous with a transmitting data pulse.

E. Embodiment In the embodiment whose circuit diagram is shown in FIG. 1, (1) is an optical fiber, one end surface (1a) of which is on the transmitting side and the other end surface (1b) on the receiving side. (2) is a transmitting device, and the transmitting side synchronization pulse (St) shown in the upper row on the left side,
Input the transmitting side data pulse (n) shown in the lower row. The transmitting side synchronizing pulse (St) does not necessarily have to have a constant period; it can be arbitrarily variable, that is, it can change over time. The time width is small, and the transmitting side data pulse (Dt) is the transmitting side synchronization pulse (St).
There are times when it occurs in synchronization with and times when it does not occur, and it is extremely large. (3) is a receiving device which outputs a receiving side synchronization pulse (Sr) shown in the upper right row and a receiving side data pulse (1)r) shown in the lower row.

For the reason described later, the receiving side synchronization pulse (Sr) is synchronized with the transmitting side synchronization pulse (8t), and the receiving side data pulse lv7. (
Dr) is synchronized with the transmitting data pulse (Dt).
However, the receiving side data pulse (Dr) is as narrow as the simultaneously occurring receiving side synchronization pulse.

First, the transmitter (2) will be described. (4) is a light emitting diode as a light emitting element, which emits light of different intensity depending on the supplied current. And optical fiber〆(1
) are placed opposite to each other at a position where light is injected into the end face (1a) of the lens. (5) is a transmission measurement voltage power supply that supplies power to the light emitting diode (4) in the direction of 1. (6) is the first ′llu
The first n as switching means of the current setting low setting resistor 7
The first npn transistor (7) is connected in series to the collector-emitter section of the pn transistor (7), and the pace of the first npn transistor (7) is connected to the transmission example 1 synchronous terminal (9) through the 5 resistor (8). αO is the second current setting resistor and the second npn as the second switch means.
It is connected in series to the collector-emitter section of the transistor (1), and the base of the second npn l-input transistor 01) is connected to the output terminal of the AND circuit q3 via the resistor θ. AND circuit 0:! One of the two input terminals of j is connected to the transmitting side synchronization pulse terminal (9), and the other is connected to the transmitting side data pulse terminal 0→.

A series connection body consisting of a first current setting resistor (6) and a collector-emitter section of a first npn transistor (7), and a second current setting resistor (+1 and a second npn transistor 0) ) is the collector-emitter section of Tokara, which is a series connection body consisting of both the first and second npn) transistors (
7) and 01) are connected in parallel to each other with the same collector-emitter section, and this parallel connection is connected in series to the circuit where the transmitting measurement voltage power supply (5) supplies power to the light emitting diode (4). It is inserted with the collector-emitter section in the forward direction.

In the above circuit, the transmitting side 1 synchronous Noculus terminal (9)
from the resistor (8), the seventh npn l l range nut (7
) to the seventh current setting resistor (6) constitutes a synchronous pulse conduction circuit for supplying power to the light-emitting diode (4) in synchronization with the synchronous pulse, and when the transmitting side synchronous pulse <I
The circuit from the response terminal (9) and the transmitting side data pulse terminal α4 to the second current setting resistor 00 via the AND circuit u3, the resistor θ2, the second npn (npn) inverter (IJ), and the second current setting resistor 00 is synchronized with the data pulse. A conduction circuit during data output is configured to supply power to the light emitting diode (4) with the same time width as the synchronization pulse. The entirety of the parallel connection of these synchronization <7 non-conduction circuit and data pulse null conduction circuit controls the current received by the light emitting diode (4) from the transmission measurement voltage power source (5), and therefore the intensity of the light emitted. It is synchronized with the transmitting side synchronization pulse, has the same time width, and is of medium magnitude, and is the same as the transmitting data pulse, and has the same time width as the transmitting side synchronization pulse, but is much larger than medium. A light emission control circuit is configured to be inactive while there is no pulse.

Next, the receiving device (3) will be described. θQ is a photodiode as a light-receiving element, and its resistance value decreases in accordance with the intensity of the light it receives. The optical fiber 11 is provided oppositely at a position to receive light from the end face (lb) of the optical fiber (1). 0η is a variable voltage divider resistor, which is connected in series with the light receiving element 1 (9) to form a variable voltage divider Q.

0 is a receiving measurement voltage power supply, and a constant voltage is applied in the forward direction with respect to the photodiode 01G at both ends of the variable voltage divider (transport) to set the potential at the voltage dividing point (g), and the photodiode 9 connects the optical fiber (1). The intensity of the light received from the light emitting diode (4) is changed to three levels: +1°, medium, and low, corresponding to the intensity of light received from the light emitting diode (4) through the 2-resistor screen.

The first reference voltage divider ■, which is formed by connecting Qυ in series, has a constant voltage of the received measurement voltage power supply 0 applied to both ends, and changes the potential at the voltage dividing point Q to the voltage divided by the variable voltage divider 0. The point σ is between the low and medium potentials.

A second reference voltage divider (C) formed by connecting two other resistors (to) in series has a constant voltage of 0 at the received measurement voltage power source applied to both ends of the voltage divider (C), and its voltage division point (B) The potential of the variable voltage divider is set between the middle and high potentials of the voltage dividing points (I) of the nine variable voltage dividers.

4 is the first comparator, which converts the variable partial pressure 'dFi (181) of the partial pressure point (I') into the first standard voltage divider @'s partial pressure point (Q
Only when the potential is higher than that of the receiving side, a pulse as a receiving side synchronization puffless is output from the receiving side 1 synchronization P/L' terminal.

@ is the second comparator, which compares the potential at the voltage dividing point (G) of the variable voltage divider θ mark with the potential at the voltage dividing point (I()) of the second reference voltage divider (to) and only when it is higher. , a pulse as a receiving side data pulse is output from the receiving side data terminal.

In the transmission bag @ (2), the first npn 1-range nut (7) is such that the voltage in the base-emitter section reaches the threshold only while the transmission side synchronization pulse terminal (9) receives the transmission side synchronization pulse. When the value exceeds the value, the collector-emitter section becomes conductive. Moreover, only when the transmitting side data pulse terminal α4 receives the transmitting side data pulse which overlaps with the transmitting side synchronizing pulse and has a larger time width, the AND circuit 03 outputs the transmitting side synchronizing pulse and the transmitting side synchronizing pulse to its two input terminals, respectively. The second npn l-transistor (11) inputs a data pulse and generates an output pulse with the same time width as the transmitting side synchronization pulse, and the second npn l-transistor (11) is activated when the voltage between the base and emitter exceeds the threshold and the voltage between the collector and emitter of the second npn l-transistor (11) exceeds the threshold. conducts.

As a result, while only the transmitter synchronization pulse occurs and the transmitter data pulse does not occur, only the current (1) passing through the first current setting resistor (6) flows through the light emitting diode (4)! ! l(
It moves and emits light at medium intensity, but the transmitting side is the same 1tJ.
When a transmitter data pulse occurs in addition to one pulse,
1) Connect the second current setting resistor (10) to the IJ current (11).
The current (11)+(, Iz), which is added to the current (I2) passing through the light emitting diode (4), drives the light emitting diode (4) to emit light at a high level of intensity. For this purpose, a signal 101O is sent to the transmitting side.
The transmitting side synchronization pulse (St) shown in the upper left of Fig. 7 corresponds to
When the transmitting side data pulse (Dt) is inputted, the light emitting diode (4) emits light with varying intensity as shown in the upper part of FIG.

In the receiving device (3), the light from the light emitting diode (4) transmitted through the optical fiber (1) is transmitted to the photodiode H.
When exposed to light, its resistance value changes in inverse proportion to the intensity of the light it receives, and the potential at the voltage dividing point (ladle) changes in direct proportion to the intensity of light, as shown in the lower part of Figure 2.

The potentials of the voltage dividing points (Q) and (R) are located at the left side of the lower row of Fig.
) generates a synchronizing pulse (Sr) on the receiving side when the potential at the voltage dividing point is higher than the potential at the voltage dividing point (T), and the second comparator
Since the receiving side data pulse (Dr) is generated when the t position is higher than the potential of the voltage dividing point (equipment), it is generated at the receiving side synchronization terminal @ and the receiving side data pulse terminal (Sr), (
The value of Dr) is as shown in the lower right of FIG.

In this way, synchronization pulses and data pulses are transmitted from the transmitter to the receiver using a shared optical fiber.

G. Effects of the Invention According to the communication device via an optical fiber of the present invention, only seven optical fibers, seven light emitting elements, and seven light receiving elements are required, and all data pulses can also be used as pulses. Since the time width of the pulse can be set small, the structure is relatively simple and the power consumption is extremely low, making it particularly suitable when a 11° C. pond is used as the power source. Of course, the aforementioned deficiencies of the conventional ones have been wiped out.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram of an embodiment of the present invention, showing both the synchronization pulse and data pulse sides of the transmitting side and the receiving side. Figure Ω is a diagram illustrating the operation of the embodiment of Figure 1. (])...Optical fiber (1a)...One end face (11))...Other end face (2)...Transmitter (3)...Receiver (4)...Emission Diode (light emitting element) (5)...
Transmission measurement voltage power supply (15+...light emission control circuit αQ...photodiode (light receiving element) αη...variable voltage dividing resistor 08)...variable voltage divider 09...reception measurement voltage power supply wire... Resistor c2D... Resistor @... First reference voltage divider ■... Resistor (to)... Resistor (a)... Second reference voltage divider (to)... First Comparison - Second Comparison Part 11'"Applicant Aichi Tokei Denki Co., Ltd.

Claims (1)

[Claims] 1. One end face (], a) on the transmitting side and the other end face (lb)! r When the optical fiber (1) on the receiving side, when both the transmitting side synchronization pulse and the transmitting side data tapernu occur, when the transmitting side synchronizing pulse occurs and the transmitting side data formula l response does not occur, and t' 2 (n (1
Strong, medium,
a transmitting device (2) for injecting light of seven levels of intensity selectively determined from three levels of weak to none into the one end face of the optical fiber; It receives light from the end face, detects which of the three cases is occurring according to its intensity level, and based on the detected content, transmits the same 1υ] pulse and the simultaneous pulse. A communication device via an optical fiber, comprising a receiving device (3) for producing a receiving synchronization pulse and a receiving data pulse simultaneous with the transmitting data pulse. 2. In the communication device using the optical fiber (1) according to claim 1, when the width of the data pulse on the transmitting side is much larger than the width of the synchronizing pulse on the transmitting side,
As a component of the transmitting device (2), a light emitting element (4) is provided opposite to the one end surface (1a) of the optical fiber (1) and emits light of different intensities in accordance with the supplied current.
and a transmission measurement voltage power supply (
5) and a synchronous pulse null conduction circuit (6χ(7
), (8) and a second switch means (
11), a data pulse conduction circuit (1,0°Ql) formed by connecting a second current setting resistor (10) in series, α skin α
and a light emission control circuit oQ and f connected in parallel to each other, and a constant voltage power supply (5) described in O1j is inserted in series in a circuit that supplies power to the light emitting element (4). As a component of (3), the optical fiber (1)
A variable voltage sensor is formed by connecting in series a light-receiving element 0 (light-receiving element 0) and a variable voltage dividing resistor (17), which is arranged opposite to the other end surface (1b) of Voltage divider 0
8 + and the intensity of the light that the light receiving element receives from the light emitting element via the square fiber by applying a constant voltage to both ends of this variable voltage divider (8) and applying the potential at the voltage dividing point. During,
It consists of a receiving measurement voltage power source that changes in three stages of high, medium, and low 1.inof corresponding to the zero, and two resistors Cat and EZll connected in series, and the receiving measurement voltage is connected to both ends of the power supply. A constant voltage of the IL voltage power source is applied, and one square of the voltage dividing point is connected to a first reference voltage divider that is between the low and medium potentials of the voltage dividing point of the variable voltage divider. and another λ resistor, □□□ are connected in series, and the above-mentioned receiving measurement 〒IJ,
A λ-th reference voltage divider Q5, to which a constant voltage of a voltage source is applied, sets the potential of the voltage dividing point between the medium and high potentials of the voltage dividing point of the variable voltage divider, and the tsJ. The receiving side synchronization pulse (8r) is generated only when the potential at the voltage dividing point of the variable voltage divider A is higher than the voltage at the voltage dividing point Q of the first reference voltage divider.
A first comparator (to) that outputs a pulse of A communication device via an optical fiber, characterized in that a second comparator outputs a pulse of data on the receiving side only when the pulse is high.