JPS59204328A - Voltage detector - Google Patents

Abstract

PURPOSE:To detect the VOH and VOL of an optical receiving module accurately by sampling and holding the stable part of a module output pulse by a pulse with specific width obtained by delaying the rising and falling of a pulse signal from the optical receiving module. CONSTITUTION:Light from a light source 1 is received by the optical receiving module 3 through an optical fiber 2, and the pulse signal from the module 3 is inputted to a multivibrator MV6 and a sample holding circuit 7. The MV6 outputs the pulse with specific width which is delayed a specific time behind the rising or falling of the input pulse signal and the pulse signal is inputted to the other terminal of the circuit 7. The circuit 7 samples and holds the stable part of the pulse signal from the module 3 by the pulse from the MV6 to output a DC voltage to a voltmeter 8. Thus, the VOH and VOL of the optical receiving module are detected accurately and easily.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a voltage detection device, and more particularly to a voltage production device suitable for easily and accurately detecting Von and VOL of an optical receiving module.

Figure 1 shows the conventional optical receiver, ) Neil's VoH, Vo+,
It is a block diagram of a measurement system. In FIG. 1, 1 is a light source such as an optical transmission module, 2 is an optical fiber ζ,
3 is an optical receiving module, and the optical signal from the light source 1 is transmitted to the optical receiving module 3 through an optical fiber /ζ2, and is detected by the signal c, -f'loaf'4 from the optical receiving module 3, and then sent to the synchroscope 5. will be displayed.

As shown in FIG.
When measuring R and VOL, a probe 4 is applied to the output terminal of the optical receiver module 3, and the output signal from the probe 4 is displayed on a synchroscope 5 to visually measure it. In other words, it was measured analogously. This is because some types of optical receiver modules 3 cannot be used because the output signal contains noise when receiving a DC optical input signal, and a normal peak detector cannot detect the signal. Oh A
- This is because you may not be able to deal with the shot.

However, the conventional method of reading signals in an analog manner with a synchroscope 5 has the drawbacks of large measurement errors because it is an analog method, and it is not easy to measure and is inefficient. The problem was that it was difficult.

The present invention has been made in view of the above, and its object is to improve VOH and VOW of an optical receiving module.

Accurately, and 1. An object of the present invention is to provide a voltage detection device that can easily detect voltage.

The feature of the present invention is that the optical receiving module receives ? a multi-zibrator which inputs a pulse signal and generates a ξ pulse of a predetermined width after a predetermined time delay from the rising or falling edge of the ξ pulse of this ξ pulse signal; and a ξ pulse signal from the optical receiving module. A Sansol-Hall 1 circuit that manually samples and holds the stable part of the signal from the multi-channel generator and outputs a DC voltage, and the output of this sample and hold circuit. It consists of a display device that displays voltage.

The present invention will be explained in detail below using the embodiment shown in FIG.

FIG. 2 is a block diagram showing an embodiment of the voltage detection device of the present invention. The same parts as in FIG. Depending on the values of the capacitor and resistor for timing setting, the multi/giver 6 generates a pulse with a predetermined width that is delayed by a predetermined time from the rising or falling edge of the ξ pulse signal, and transmits this pulse to one input terminal. manually input the ξ noise signal from the optical receiver module 3 to the other input terminal of the sample hole 1 circuit 7,
The sample-and-hold circuit 7 outputs a DC voltage obtained by sampling and holding a stable part of the pulse signal () of the pulse signal from the optical receiver module 3, and this DC voltage is measured by a voltmeter 8.
It is recommended that you give it to someone.

According to the embodiment of the present invention described above, simple peak detection can be performed by detecting a voltage that avoids unstable portions of the rise and fall of the pulse of the pulse signal from the optical receiving module 3. Since it can be detected and Hall 1, the voltage can be measured with the voltmeter 8 without using a synchroscope. Furthermore, automatic measurement is also possible by using a computer.

In addition, in the case of the above embodiment, the multi-9ibrator 6
Since the timing and width of the e pulse generated from the multi-ζ ibrator 6 are determined by the capacitor and resistor externally attached to the multi-ζ ibrator 6, the frequency of the signal to be measured is limited to some extent. However, if the values of the capacitor and resistor are set to 17 so that they can be switched using a relay or the like, the frequency range of the signal can be widened.

As described above, according to the present invention, the Vou and VOL of the optical receiving module can be detected accurately and easily, and automatic measurement is also possible.

[Brief explanation of the drawing]

@1 Diagram shows VoI+ and VO of the conventional optical receiver module.
A block diagram of the L measurement system. FIG. 2 is a block diagram showing an embodiment of the voltage detection device of the present invention. 3... Optical receiver module, 6... Multi-no-Ibray No. 11, 2nd WJ

Claims (1)

[Claims] 1. A multi-gibrator that manually generates a ξ pulse of a predetermined width that is delayed by a predetermined time from the rise or fall of the pulse of the pulse signal by manually inputting the ξ pulse signal from the optical receiving module, and the optical receiver; a sample-and-hold circuit that inputs the pulse signal from the module and the ξ pulse from the multinomial ibrator, samples and holds a stable portion of the ξ pulse signal, and outputs a DC voltage; A voltage detection device comprising a display device that displays the output voltage of a Hall 1 circuit.