JPH0662655U - Optical repeater for data signal transmission - Google Patents

Abstract

(57) [Abstract] [Purpose] To reduce the power consumption when data communication is not performed and suppress the heat generation of the drive unit and the light emitting element to extend the life of the element. [Configuration] A negative data signal of a CSMA / CD system in a LAN is input to an input unit 11 of a transmission circuit unit 10,
After being amplified by the buffer unit 12, it is inverted and amplified by the inverting / amplifying unit 13. The drive unit 14 drives the light emitting element unit 15 by the positive data signal that has been inverted and amplified, converts the light emitting element unit 15 into an optical signal, and radiates the optical signal to the space via the lens unit 16. In the receiving circuit unit 20, the optical signal is input to the light receiving element unit 22 via the lens unit 21 and converted into an electric signal. This electric signal is amplified by the amplification unit 23 and then amplified by the comparator unit 2.
The waveform is inverted and waveform shaped in 4 and input to the drive unit 25 and the bias unit 26. The output signal of the drive unit 25 is combined with the bias signal output from the bias unit 26 and output from the output unit 27.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an optical repeater used when transmitting a CSMA / CD (Carrier Sense Multiple Access with Collision Detection) data signal in a LAN (Local Area Network).

[0002]

[Prior art]

 Standardized CSMA / CD data signals in the LAN are used as shown in FIG. That is, the data signal unit 1 gives a bias signal of "-0.2V" to the reference level "0V", a high level 3 of "-0.2V" and a low level of "-1.8V". Signal contents are represented by a combination of level 4. On the other hand, in the signalless portion 2, the high level 5 of "0V" is set. In the conventional optical repeater, the burst wave signal shown in FIG. 3 is directly driven by the baseband modulation method to pulse drive the light emitting element, for example, the near infrared light emitting diode.

[0003]

[Problems to be solved by the device]

 When the light emitting element is driven using the burst wave signal as it is as described above, the light emitting element emits the maximum light at the high level 3 and the minimum light at the low level 4 of the data signal section 1. Therefore, the light emitting element is kept in the maximum light emitting state at the high-level signalless portion 2. In this case, since a large drive current is passed through the light emitting element to obtain a large light emission output, the maximum current continues to flow in the light emitting element when CSMA / CD system data communication is not performed. The life of the light emitting device is shortened and the power consumption is increased, which is very inefficient.

The present invention has been made in consideration of the above situation, and can reduce power consumption when data communication is not performed, suppress heat generation of the drive unit and the light emitting element, and prolong the life of the element. An object is to provide an optical repeater for data signal transmission that can be achieved.

[0005]

[Means for Solving the Problems]

 The present invention is an optical repeater for transmitting a CSMA / CD system data signal in a LAN, and an inverting / amplifying section for inverting and amplifying a CSMA / CD system negative data signal input to a transmitting circuit section, and an inverting and amplifying section. A drive unit that current-amplifies the positive data signal output from the amplification unit, a light-emitting element unit that is driven by this drive unit to generate an optical signal, and the optical signal output from this light-emitting device unit And a lens unit that emits light to the.

[0006]

[Action]

 The negative data signal of the CSMA / CD system input to the transmission circuit section is inverted and amplified by the inverting / amplification section to become a positive signal, which is input to the drive section. The drive section current-amplifies the positive data signal and drives the light emitting element section to generate an optical signal. Then, the optical signal output from the light emitting element section is radiated into space through the lens section and sent to the receiving circuit section.

As described above, in the transmission circuit section, the input data signal is inverted and amplified to drive the light emitting element section. As a result, when the data communication is not performed, the output signal of the drive section becomes "0V", and the light emitting element section is kept in the minimum light emitting state. As a result, the life of the light emitting element can be extended and the power consumption can be reduced.

[0008]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a configuration of a transmitting circuit unit 10 and a receiving circuit unit 20 of an optical repeater for data signal transmission according to an embodiment of the present invention. The transmission circuit unit 10 includes an input unit 11, a buffer unit 12, an inverting / amplifying unit 13, a drive unit 14, a light emitting element unit 15, and a lens unit 16.

A CSMA / CD data signal in the LAN is input to the input unit 11, amplified by the buffer unit 12, and then inverted and amplified by the inverting / amplifying unit 13. The data signal inverted and amplified by the inversion / amplification unit 13 is input to the drive unit 14. The drive section 14 current-amplifies the input data signal to drive the light emitting element section 15 to output an optical signal. Then, the optical signal output from the light emitting element section 15 is radiated into space through the lens section 16 and sent to the receiving circuit section 20.

On the other hand, the reception circuit section 20 is composed of a lens section 21, a light receiving element section 22, an amplification section 23, a comparator section 24, a drive section 25, a bias section 26, and an output section 27. The optical signal sent from the transmission circuit unit 10 is input to the light receiving element unit 22 via the lens unit 21 and converted into an electric signal. The electric signal is amplified by the amplifier 23, inverted and waveform-shaped by the comparator 24, and input to the drive unit 25 and the bias unit 26. The bias unit 26 generates a bias signal of "-0.2V". Then, the output signal of the drive unit 25 is combined with the bias signal output from the bias unit 26 and output to the output unit 27. Next, the operation of the above embodiment will be described.

A CSMA / CD data signal in the LAN shown in FIG. 2A is input to the input unit 11, amplified by the buffer unit 12, and then inverted and amplified by the inverting / amplifying unit 13. By this inverting amplification, the data signal has an amplitude in the positive direction with reference to the "0" level as shown in FIG. 2 (b). At this time, regarding the data signal, the bias signal 6 of "-0.2V" in the data signal section 1 is regarded as the same level as the "0" level, and in the inverted amplification waveform shown in FIG. It becomes low level. The positive data signal output from the inverting / amplifying unit 13 is input to the drive unit 14. As a result, the drive section 14 drives the light emitting element section 15 by the positive drive signal shown in FIG. 2C to generate an optical signal. Then, the optical signal output from the light emitting element section 15 is radiated into space through the lens section 16 and sent to the receiving circuit section 20.

The receiving circuit section 20 inputs the optical signal sent from the transmitting circuit section 10 to the light receiving element section 22 via the lens section 21, and converts it into an electric signal. This electric signal is amplified by the amplification unit 23, inverted and waveform-shaped by the comparator unit 24, and becomes a negative data signal with reference to the “0” level as shown in FIG. It is input to the unit 25 and the bias unit 26.

The bias unit 26 generates a bias signal of "-0.2V" shown in FIG. 2 (e). Therefore, the output signal of the drive unit 25 is combined with the bias signal output from the bias unit 26 to obtain the data signal shown in FIG. 2 (f), that is, the CSMA / CD data signal shown in FIG. 2 (a). The same signal waveform is reproduced and output from the output unit 27.

As described above, in the transmission circuit unit 10, since the data signal is inverted and amplified by the inverting / amplifying unit 13 and inverted to the positive signal with the “0” level as the reference, data communication is performed. When there is no signal, that is, in the no-signal section 2, the output signal level of the drive section 14 becomes "0", and the light emitting element section 15 is not driven.

Although the bias signal portion of the data signal is lost due to the inverting amplification of the inverting / amplifying unit 13, the bias signal is added by the bias unit 26 provided in the receiving circuit unit 20, so that the original data signal Can be restored and transmitted correctly.

[0016]

[Effect of device]

 As described above in detail, according to the present invention, in the CSMA / CD system data communication, the negative data signal is inverted into the positive signal and the light emitting element is pulse-driven, so that the data communication is performed. When not in use, power consumption can be reduced to suppress heat generation in the drive section and the light emitting element, and the life of the element can be extended.

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of an optical repeater for data signal transmission according to an embodiment of the present invention.

FIG. 2 is a timing chart explaining the operation of the embodiment.

FIG. 3 is a diagram showing a CSMA / CD system data signal waveform in a LAN.

[Explanation of symbols]

1 ... Data signal part, 2 ... No signal part, 10 ... Transmission circuit part, 11 ... Input part, 12 ... Buffer part, 13 ...
Inversion / amplification section, 14 ... Drive section, 15 ... Light emitting element section, 16 ... Lens section, 20 ... Reception circuit section, 21 ...
Lens part, 22 ... light receiving element part, 23 ... amplifying part,
24 ... Comparator section, 25 ... Drive section,
26 ... Bias section, 27 ... Output section.

Claims (1)

[Scope of utility model registration request] 1. In an optical repeater for transmitting a CSMA / CD system data signal in a LAN, an inverting / amplifying section for inverting and amplifying a CSMA / CD system negative data signal input to a transmitting circuit section, and this inverting section. A drive unit that current-amplifies the positive data signal output from the amplification unit, a light emitting element unit that is driven by this drive unit to generate an optical signal, and emits the optical signal output from this light emitting unit unit into space An optical repeater for data signal transmission, comprising: