JPH0548541A - Optical array link - Google Patents

Abstract

PURPOSE:To detect a broken optical array link and attenuation of an optical signal by setting a proper detection threshold level even when an optical signal is attenuated in the optical array link with respect to the optical array link interconnecting optically an information device, a computer and an exchange or the like. CONSTITUTION:The system is provided with a sender side optical array link module in which a light emitting element array 3 with plural light emitting elements arranged and a connector 5 with plural optical fibers arranged are combined opposite to each other, and with a receiver side optical array link module in which a light receiving element array 9 with plural light receiving elements arranged and a connector 7 with plural optical fibers arranged are combined opposite to each other. The optical array link with one or both the modules is provided with an auxiliary line to detect the attenuation of an optical signal in addition to the optical signal line through which the optical signal is sent.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to information equipment, such as
The present invention relates to an optical array link that optically connects a computer, an exchange, and the like. In the interface of recent information equipment,
An optical array link is required to realize high-speed and large-capacity data transmission.

[0002]

2. Description of the Related Art In a conventional optical array link, a light emitting element array made up of a plurality of light emitting elements, an integrated lens array made up of a plurality of lenses, and a connector made up of a plurality of optical fibers are connected to individual light emitting elements, lenses, and optical fibers. Optical array link module assembled facing each other, a receiving side assembled by facing a connector composed of a plurality of optical fibers, an integrated lens array composed of a plurality of lenses, and a light receiving element array composed of a plurality of light receiving elements. An optical array link for transmitting an optical signal was constructed using the optical array link module.

[0003]

Therefore, at the time of assembling or reassembling in the manufacturing stage, between the light emitting element array and the integrated lens array, between the integrated lens array and the connector of the transmission side optical array link module, Also, in the optical array link module on the receiving side, a positional deviation occurs between the connector and the integrated lens array and between the integrated lens array and the light receiving element array, and each element is displaced in the same direction by the same amount, and the transmitted light is transmitted. The signal had about the same amount of attenuation.

Therefore, when the optical signal is an analog or digital alternating current (AC) signal, even if the optical signal is attenuated, an appropriate detection threshold level should be set from the peak value and the valley value of the signal. However, it is difficult to set an appropriate detection threshold level when a direct current (DC) signal continues. Since the optical signals may be turned off for a short period of time, it is not possible to immediately detect whether or not a failure such as disconnection has occurred in the optical array link only by the presence or absence of the optical signal. Therefore,
INDUSTRIAL APPLICABILITY The present invention is capable of setting an appropriate detection threshold level even if an optical signal is attenuated in an optical array link, detecting disconnection of the optical array link, and attenuation of the optical signal in the optical array link. It is intended to provide an optical array link capable of performing.

[0005]

In an optical array link according to the present invention, a transmitting side optical array in which a light emitting element array in which a plurality of light emitting elements are arranged and a connector in which a plurality of optical fibers are arranged are combined facing each other. Both a link module and a receiving side optical array link module in which a connector in which a plurality of optical fibers are arranged and a light receiving element array in which a plurality of light receiving elements are arranged are combined facing each other, or
In the optical array link equipped with one of them, in addition to the optical signal line for transmitting the optical signal, a configuration is adopted in which an auxiliary line for detecting the attenuation amount of the optical signal is provided.

In this case, a configuration is adopted in which an H level signal and an L level signal are transmitted via the auxiliary line. Further, a configuration is adopted in which the H level signal and the L level signal are alternately transmitted via the auxiliary line. Further, in this case, a configuration is adopted in which the disconnection of the optical array link or the attenuation of the optical signal is detected from the H level signal and the L level signal transmitted via the auxiliary line.

[0007]

According to the optical array link of the present invention, a light emitting element array in which a plurality of light emitting elements are arranged and a connector in which a plurality of optical fibers are arranged face to face and are combined, and a plurality of optical arrays. Optical signals are transmitted in both a receiving side optical array link module in which a connector in which fibers are arranged and a light receiving element array in which a plurality of light receiving elements are arranged are combined facing each other, or in an optical array link including one of them. In addition to the optical signal line, an auxiliary line for detecting the amount of attenuation of the optical signal is provided, and an H level signal and an L level signal are transmitted by each auxiliary line, or an H level signal and an H level signal are transmitted by one auxiliary line. Since the L level signal is transmitted alternately, the attenuation of the optical signal caused by the position shift of the optical array link module is automatically performed. And amortization, it is possible to set an appropriate detection threshold level of the signal.

In addition, H transmitted through the auxiliary line
By detecting the level signal and the L level signal, the disconnection of the optical array link or the attenuation of the optical signal can be monitored.

[0009]

Embodiments (First Embodiment) FIG. 1 shows an optical system according to an embodiment of the present invention.
It is a structure explanatory view of an array link. In this figure, 1
₁1₂Is a signal input terminal, 2₁Two₂Is for signal amplification
Bowl, 2_HIs an H level amplifier, 2_LIs for L level amplification
Vessel, 3 is a light emitting element array, 3₁Three₂Is a luminescent element for signals
Child, 3_HIs a light emitting element for H level, 3_LIs for L level
Elements, 4 is an integrated lens array, 5 is a connector, 6₁,
6₂Is a signal optical cable, 6_HIs an optical cave for H level
Le, 6_LIs an optical cable for L level, 7 is a connector, 8 is
Integrated lens array, 9 is a light receiving element array, 9₁, 9₂
Is a light receiving element for signal, 9 _HIs a light receiving element for H level, 9_LIs
Light receiving element for L level, 10₁10,₂Is for signal I-V increase
Width device, 10_HIs an I-V amplifier for H level, 10_LIs L
Bell IV amplifier, 11₁, 11₂Is a comparator, 1
Two₁, 12₂Is a signal output terminal, 13_HIs for H level
Width device, 13_LIs an L level amplifier, 14_HIs for H level
Output terminal, 14_LIs an output terminal for L level.

In the optical array link of this embodiment, an electric signal is input to the signal input terminals 1 ₁ and 1 ₂ , the signal is amplified by the signal amplifier 2 ₁ and 2 ₂ , and the signal light is emitted by the signal. The elements 3 ₁ , 3 ₂ are caused to emit light, the optical signals thereof are converged by the lens of the integrated lens array 4 and input to the optical fiber of the connector 5, and the optical signals are connected by the connector 5 to the signal optical cable 6 ₁ , 6 ₂ is transmitted, and the transmitted optical signal is applied to the signal light receiving elements 9 ₁ and 9 ₂ by the connector 7 and the integrated lens array 8, and the voltage is applied by the signal IV amplifiers 10 ₁ and 10 ₂ . To the input terminals of one of the comparators 11 ₁ and 11 ₂ and output from the signal output terminals 12 ₁ and 12 ₂ .

On the other hand, in addition to the above signal line, the H level amplifier 2 _H causes the H level light emitting element 3 _H to emit light at an intensity equivalent to the H level, and this optical signal is transmitted as described above. Similar to the method, it is converged by the lens of the integrated lens array 4, is input to the optical fiber of the connector 5, is further transmitted through the optical cable 6 _H for H level, and the transmitted H level signal is integrated with the connector 7. The lens array 8 irradiates the H-level light receiving element 9 _H , and the H-level IV amplifier 10 _H converts the voltage into a voltage.

Further, the L level amplifier 2 _L causes the L level light emitting element 3 _L to emit light with an intensity equivalent to the L level, the optical signal is converged by the lens of the integrated lens array 4, and the optical fiber of the connector 5 is used. And then
The light is transmitted through the L-level optical cable 6 _L , irradiated through the connector 7 and the integrated lens array 8 to the L-level light receiving element 9 _L , and converted into a voltage by the L-level IV amplifier 10 _L.

The voltage between the outputs of the H-level I-V amplifier 10 _H and the L-level I-V amplifier 10 _L is divided by a resistor and connected to the other input terminals of the comparators 11 ₁ and 11 _2. ing.

The signal light emitting element 3 ₁ ,
3 ₂ , H level light emitting element 3 _H , L level light emitting element 3
_L is a laser diode (LD) or a light emitting diode (LED), which are integrally formed at a predetermined interval to form a light emitting element array 3. The lens interval of the integrated lens array 4 is The distance between the light emitting elements is the same, and the distance between the optical fibers at each connection point of the connector 5 is also the same as the distance between the light emitting elements.

Further, the connector 7, the integrated lens array 8, the signal light receiving elements 9 ₁ and 9 ₂ , and the H level light receiving element 9
_H, the light receiving element array 9 comprising the L level for the light-receiving element 9 _L
Also, regarding, the elements are formed so as to be arranged at the same intervals.

Incidentally, 13 _H and 13 _L in this configuration explanatory diagram,
14 _H and 14 _L will be described in the second embodiment.

In this embodiment, as described above, the H level
Divide the voltage corresponding to the bell and the voltage corresponding to the L level
The voltage corresponding to each optical signal and the comparator 11₁1
1₂To obtain the output signal by
Or integrated with the above light-emitting element array during the reassembly stage
Between the integrated lens array 4 and the integrated lens array 4
Lens array between connectors 5 or connector 7 and integrated lens array
8 between the integrated lens array 8 and the light receiving element array
As the position shift occurs, the voltage corresponding to each optical signal drops.
Also the voltage corresponding to the H level and the voltage corresponding to the L level
Is reduced by the same proportion as this, and the comparator 11₁, 11₂
The difference in the voltage applied to the input terminals of the
Compensates for the optical signal attenuation due to the displacement of the academic system and outputs the signal.
Force terminal 12 ₁, 12₂The effect on the signal output to
It can be reduced.

In this embodiment, when compensating for the attenuation of the optical signal due to the displacement of the optical system, it is not necessary to add additional input / output terminals of the optical array link module, which facilitates the manufacture.

(Second Embodiment) An optical array link of the second embodiment will be described with reference to FIG. In this embodiment, an H-level I-V amplifier 10 is added to the configuration of the first embodiment.
The output of the _H derived H level output terminal 14 _H through H level amplifier 13 _H, L level for I-V amplifier 1
An additional point is that the 0 _L output is led to the L level output terminal 14 _L via the L level amplifier 13 _L.

With this configuration, the H-level output terminal
Child 14_HAnd L level output terminal 14 _LVoltage fluctuations between
By detecting the
Monitor the attenuation of the optical signal in the optical cable and
You can switch or output an alarm.
it can.

In this embodiment, there are two auxiliary lines, and an H level signal and an L level signal are passed through each auxiliary line.
Although it has been described that the level signal is transmitted, the same effect as the above can be obtained by providing one auxiliary line and alternately transmitting the H level signal and the L level signal via the auxiliary line. .

(Third Embodiment) In each of the above embodiments, an integrated lens array 4 is interposed between the light emitting element arrays 3 ₁ , 3 ₂ , 3 _H , 3 _L and the connector 5. Although shown, the integrated lens array 4 can be integrally formed on the light emitting element array side or the connector 5 side from the beginning of manufacturing. In this case, only the positional deviation between the light emitting element array and the connector is generated. It becomes a problem.

Further, the integrated lens array 8 is connected to the connector 7 side or the light receiving element array 9 ₁ , 9 ₂ , 9 _H , 9 _L.
It may be formed integrally with the side from the beginning of manufacturing. In this case, only the positional deviation between the connector 7 and the light receiving element array becomes a problem. Further, the optical array link module can be configured without using the integrated lens arrays 4 and 8.

[0024]

As described above, according to the present invention,
Between the light emitting element array and the integrated lens array of the transmission side optical array link module, between the integrated lens array and the connector, or between the connector and the integrated lens array of the reception side optical array link module, and the integrated lens array. The detection threshold level for automatically detecting an optical signal can be set even if a positional deviation occurs between the light receiving element arrays during the manufacturing process or the reassembly process, and the optical array link It is possible to monitor disconnection and realize a stabilized optical array link.

[Brief description of drawings]

FIG. 1 is a diagram illustrating the configuration of an optical array link according to an embodiment of the present invention.

[Explanation of symbols]

1 ₁ , 1 ₂ signal input terminal 2 ₁ , 2 ₂ signal amplifier 2 _H H level amplifier 2 _L L level amplifier 3 light emitting element array 3 ₁ , 3 ₂ signal light emitting element 3 _H H level light emitting element 3 Light emitting element for _L L level 4 Integrated lens array 5 Connector 6 ₁ , 6 ₂ Signal optical cable 6 _H H level optical cable 6 _L L level optical cable 7 Connector 8 Integrated lens array 9 Light receiving element array 9 ₁ , 9 ₂ signal Light receiving element 9 _H H level light receiving element 9 _L L level light receiving element 10 ₁ , 10 ₂ Signal I-V amplifier 10 _H H level I-V amplifier 10 _L L level I-V amplifier 11 ₁ , 11 ₂ Comparator 12 ₁ , 12 ₂ Signal output terminal 13 _H H level amplifier 13 _L L level amplifier 14 _H H level output terminal 14 _L L level output terminal

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Manabu Mayuzumi 1844-2, Kozoji-cho, Kasugai-shi, Aichi FUJITSU VIS Co., Ltd.

Claims (4)

[Claims] 1. A transmission side optical array link module in which a light emitting element array in which a plurality of light emitting elements are arranged and a connector in which a plurality of optical fibers are arranged are combined facing each other, and a connector in which a plurality of optical fibers are arranged. Both of the receiving side optical array link module in which a plurality of light receiving element arrays in which a plurality of light receiving elements are arranged are combined facing each other, or in an optical array link including one of them, in addition to an optical signal line for transmitting an optical signal, An optical array link comprising an auxiliary line for detecting the amount of attenuation of an optical signal. 2. An H level signal and an L level signal are transmitted via an auxiliary line.
Optical array link described. 3. The optical array link according to claim 1, wherein the H level signal and the L level signal are alternately transmitted via the auxiliary line. 4. The optical array link according to claim 1, wherein disconnection of the optical array link or attenuation of the optical signal is detected by an H level signal and an L level signal transmitted via the auxiliary line.