JPS626755Y2 - - Google Patents
Info
- Publication number
- JPS626755Y2 JPS626755Y2 JP1977084933U JP8493377U JPS626755Y2 JP S626755 Y2 JPS626755 Y2 JP S626755Y2 JP 1977084933 U JP1977084933 U JP 1977084933U JP 8493377 U JP8493377 U JP 8493377U JP S626755 Y2 JPS626755 Y2 JP S626755Y2
- Authority
- JP
- Japan
- Prior art keywords
- signal
- circuit
- voltage
- optical
- gain control
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 230000005540 biological transmission Effects 0.000 claims description 15
- 230000003287 optical effect Effects 0.000 claims description 14
- 230000006866 deterioration Effects 0.000 claims description 10
- 238000006243 chemical reaction Methods 0.000 claims description 2
- 238000001514 detection method Methods 0.000 claims description 2
- 239000003990 capacitor Substances 0.000 description 4
- 230000003321 amplification Effects 0.000 description 3
- 238000003199 nucleic acid amplification method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000032683 aging Effects 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000003449 preventive effect Effects 0.000 description 1
Landscapes
- Dc Digital Transmission (AREA)
- Monitoring And Testing Of Transmission In General (AREA)
- Optical Communication System (AREA)
Description
【考案の詳細な説明】
本考案は光を用いたデータ伝送装置に関するも
のである。さらに詳しくは光を用いたデータ伝送
装置における光回路部品の劣化検出に関するもの
である。[Detailed Description of the Invention] The present invention relates to a data transmission device using light. More specifically, the present invention relates to detection of deterioration of optical circuit components in a data transmission device using light.
光を用いたデータ伝送装置においては電／光変
換点において絶縁が行われるので本質安全性、耐
サージ性等において優れているが、発光素子の経
年劣化の問題がある。これは発光出力が時と共に
低下する現象で、劣化の傾向は時間の指数関数と
いわれているが、それより劣化が著しい場合もあ
り、そのしくみは充分解明されてはいない。また
使用条件や環境にも強く影響される。このため光
を用いたデータ伝送装置においては発光素子の劣
化を検出して、動作不能になる前に交換等の処理
がとれるようにすることが、装置の信頼性や保全
性を高める上で大切である。 In a data transmission device using light, insulation is performed at the electrical/optical conversion point, so it is excellent in intrinsic safety, surge resistance, etc., but there is a problem in that the light emitting element deteriorates over time. This is a phenomenon in which the luminous output decreases over time, and the tendency of deterioration is said to be an exponential function of time, but in some cases the deterioration is even more severe, and the mechanism behind this is not fully understood. It is also strongly influenced by usage conditions and environment. For this reason, in data transmission equipment that uses light, it is important to detect deterioration of light emitting elements and replace them before they become inoperable, in order to improve the reliability and maintainability of the equipment. It is.
本考案の目的は光回路部品の劣化検出手段を備
えたデータ伝送装置を提供することにある。 An object of the present invention is to provide a data transmission device equipped with means for detecting deterioration of optical circuit components.
本考案は受信側に設けた自動利得制御回路の制
御出力に基づいて光回路部品の劣化を検出するよ
うにしたものである。 The present invention detects deterioration of optical circuit components based on the control output of an automatic gain control circuit provided on the receiving side.
以下図面によつて本考案を説明する。第１図は
本考案実施例の電気的接続図である。第１図にお
いて、１は送信回路、２は光伝送路、３は受信回
路である。 The present invention will be explained below with reference to the drawings. FIG. 1 is an electrical connection diagram of an embodiment of the present invention. In FIG. 1, 1 is a transmitting circuit, 2 is an optical transmission line, and 3 is a receiving circuit.
送信回路１において、１１は演算増幅器、１１
１はバイアス電源、１１２〜１１６は抵抗、１１
７はコンデンサ、１２は出力トランジスタ、１３
は発光ダイオードである。演算増幅器１１の反転
入力端子には入力信号が抵抗１１２を通じて与え
られ、非反転入力端子にはバイアス電源１１１の
電圧が抵抗１１３と１１５によつて分圧されて与
えられる。演算増幅器１１の出力信号は出力トラ
ンジスタ１２のベースに駆動信号として与えられ
る。出力トランジスタ１２のエミツタには抵抗１
１６が直列に接続され、その電圧降下が抵抗１１
４を通じて演算増幅器１１の反転入力端子に帰還
される。抵抗１１６にはコンデンサ１１７が並列
に接続され、電圧降下を平滑している。出力トラ
ンジスタ１２のコレクタには発光ダイオード１３
が直列に接続される。 In the transmitting circuit 1, 11 is an operational amplifier;
1 is a bias power supply, 112 to 116 are resistors, 11
7 is a capacitor, 12 is an output transistor, 13
is a light emitting diode. An input signal is applied to an inverting input terminal of the operational amplifier 11 through a resistor 112, and a voltage of a bias power supply 111 is applied after being divided by resistors 113 and 115 to a non-inverting input terminal. The output signal of the operational amplifier 11 is applied to the base of the output transistor 12 as a drive signal. A resistor 1 is connected to the emitter of the output transistor 12.
16 are connected in series, and the voltage drop is caused by the resistance 11
4 to the inverting input terminal of the operational amplifier 11. A capacitor 117 is connected in parallel to the resistor 116 to smooth the voltage drop. A light emitting diode 13 is connected to the collector of the output transistor 12.
are connected in series.
このような送信回路１において、発光ダイオー
ド１３は入力信号が零のときバイアス電源１１１
の電圧に対応した輝度で点灯しており、入力信号
が印加されるとそれに応じて変調された輝度で点
灯する。発光ダイオード１３の光は光伝送路２を
通じて受信回路３に与えられる。 In such a transmitting circuit 1, the light emitting diode 13 is connected to the bias power supply 111 when the input signal is zero.
It lights up with a brightness that corresponds to the voltage, and when an input signal is applied, it lights up with a brightness that is modulated accordingly. The light from the light emitting diode 13 is given to the receiving circuit 3 through the optical transmission line 2.
受信回路３において、３１はフオトダイオー
ド、３２は演算増幅器、３２１は抵抗とFETの
直列回路からなる可変抵抗である。フオトダイオ
ード３１は電源の負端子と演算増幅器３２の反転
入力端子の間に接続される。演算増幅器の反転入
力端子には可変抵抗３２１を通じて出力端子から
負帰還がほどこされ、非反転入力端子はコモン点
に接続される。フオトダイオード３１は光伝送路
２を通じて与えられた光量に応じて電流を生じる
ので、演算増幅器３２の反転入力端子には受光量
に応じた電気信号が与えられ、これが増幅され
る。３３は演算増幅器、３３１はバイアス電源、
３３２〜３３５は抵抗である。これらは送信回路
１の増幅回路と同様にバイアス付増幅回路を構成
する。３４は演算増幅器、３４１，３４２はそれ
ぞれ抵抗およびコンデンサである。これらは積分
器を構成する。３５は比較器である。 In the receiving circuit 3, 31 is a photodiode, 32 is an operational amplifier, and 321 is a variable resistor consisting of a series circuit of a resistor and an FET. Photodiode 31 is connected between the negative terminal of the power supply and the inverting input terminal of operational amplifier 32 . Negative feedback is applied to the inverting input terminal of the operational amplifier from the output terminal through a variable resistor 321, and the non-inverting input terminal is connected to a common point. Since the photodiode 31 generates a current according to the amount of light applied through the optical transmission line 2, an electric signal corresponding to the amount of light received is applied to the inverting input terminal of the operational amplifier 32, and this is amplified. 33 is an operational amplifier, 331 is a bias power supply,
332 to 335 are resistors. These constitute a biased amplifier circuit similarly to the amplifier circuit of the transmitting circuit 1. 34 is an operational amplifier, and 341 and 342 are a resistor and a capacitor, respectively. These constitute an integrator. 35 is a comparator.
演算増幅器３２の直流バイアスを含んだ出力信
号は演算増幅器３３からなるバイアス付増幅回路
でバイアス電源３３１によるバイアス電圧分だけ
差引かれて増幅される。伝送信号が減衰している
と、その中のバイアス成分はバイアス電源３３１
によるバイアス電圧よりも小さいから、演算増幅
器３３の出力には直流分が含まれ、これが積分器
で積分される。積分器の出力信号（負）はFET
のゲートに与えられ、FETの内部抵抗を増加さ
せ、それによつて受信信号の増幅利得を上げる。
増幅利得は受信信号に含まれたバイアス分がバイ
アス電源３３１の電圧に平衡するまで上げられ
る。バイアス分が平衡したとき演算増幅器３３の
出力信号は減衰補償された交流分だけとなり、こ
れが出力される。すなわち受信信号は自動利得制
御増幅回路で増幅される。 The output signal containing the DC bias of the operational amplifier 32 is subtracted by the bias voltage from the bias power supply 331 and amplified by the biased amplifier circuit comprising the operational amplifier 33. When the transmission signal is attenuated, the bias component therein is removed from the bias power supply 331.
Since the bias voltage is smaller than the bias voltage, the output of the operational amplifier 33 includes a DC component, which is integrated by an integrator. The output signal (negative) of the integrator is FET
is applied to the gate of the FET to increase the internal resistance of the FET, thereby increasing the amplification gain of the received signal.
The amplification gain is increased until the bias included in the received signal is balanced with the voltage of the bias power supply 331. When the bias components are balanced, the output signal of the operational amplifier 33 becomes only the attenuation-compensated alternating current component, which is output. That is, the received signal is amplified by an automatic gain control amplifier circuit.
受信信号の減衰が大きいほど増幅利得を高める
必要があるので、積分器の出力電圧が大きくな
る。したがつて積分器の出力電圧は受信信号の減
衰量に対応する。積分器の出力電圧は比較器３５
によつて基準値と比較され、その結果が報告され
る。基準値は許容減衰量に対応して定められる。 The greater the attenuation of the received signal, the higher the amplification gain needs to be, so the output voltage of the integrator becomes larger. The output voltage of the integrator therefore corresponds to the amount of attenuation of the received signal. The output voltage of the integrator is determined by the comparator 35.
The results are compared with the standard values and the results are reported. The reference value is determined corresponding to the allowable attenuation amount.
このような装置において、送信回路１の発光ダ
イオード１３が経年劣化して発光量の低下が限度
を越えると積分器の出力電圧は基準値を越え、比
較器３５は警報信号が発生する。警報信号が発生
するとそれに応じて発光ダイオード１３の交換等
適切な処置がとられる。経年劣化は発光ダイオー
ド１３において最も著しいが、本装置においては
発光ダイオードばかりでなく、信号経路のいずれ
の素子が劣化しても警報が発生する。特に、受信
アンプ系の故障も検出できる利点を有する。 In such a device, when the light emitting diode 13 of the transmitting circuit 1 deteriorates over time and the reduction in the amount of light emitted exceeds a limit, the output voltage of the integrator exceeds the reference value, and the comparator 35 generates an alarm signal. When an alarm signal is generated, appropriate measures such as replacing the light emitting diode 13 are taken accordingly. Deterioration over time is most significant in the light emitting diode 13, but in this device, an alarm is generated when not only the light emitting diode but any element in the signal path deteriorates. In particular, it has the advantage of being able to detect failures in the receiving amplifier system.
また、直流バイアス成分をパイロツトとしてい
ることから、伝送信号の減衰の影響がより顕著に
受信側の回路信号に表れるため、容易に回路の劣
化を検出できる。 Furthermore, since the DC bias component is used as a pilot, the influence of the attenuation of the transmission signal appears more prominently in the circuit signal on the receiving side, so that deterioration of the circuit can be easily detected.
このように本考案によれば、信号経路の各素子
とくに光回路部品の経年劣化が検出できるので、
光を用いたデータ伝送装置の予防保全を適切に行
うことができ、信頼性を高めるのに効果的であ
る。 As described above, according to the present invention, aging deterioration of each element in the signal path, especially optical circuit components, can be detected.
Preventive maintenance of a data transmission device using light can be appropriately performed and is effective in increasing reliability.
図は本考案実施例の電気的接続図である。
１……送信回路、１１……演算増幅器、１１１
……バイアス電源、１１２〜１１６……抵抗、１
２……トランジスタ、１３……発光ダイオード、
２……光伝送路、３……受信回路、３１……フオ
トダイオード、３２……演算増幅器、３２１……
可変抵抗、３３……演算増幅器、３３１……バイ
アス電源、３３３〜３３５……抵抗、３４……演
算増幅器、３４１……抵抗、３４２……コンデン
サ、３５……比較器。
The figure is an electrical connection diagram of an embodiment of the present invention. 1... Transmission circuit, 11... Operational amplifier, 111
...Bias power supply, 112-116...Resistor, 1
2...Transistor, 13...Light emitting diode,
2... Optical transmission line, 3... Receiving circuit, 31... Photo diode, 32... Operational amplifier, 321...
Variable resistor, 33... operational amplifier, 331... bias power supply, 333-335... resistor, 34... operational amplifier, 341... resistor, 342... capacitor, 35... comparator.
Claims (1)
送信光信号を発生する光変調器を備え、 この送信回路から光伝送路を経て伝送された送
信光信号を受信する受信回路には、 受信光の光／電変換信号を増幅して復調信号を
発生するゲイン可変の自動利得制御増幅器と、 この自動利得制御増幅器の出力電圧からバイア
ス電圧を差引いた電圧を増幅して出力するバイア
ス付増幅回路と、 このバイアス付増幅回路の出力電圧を積分し、
積分信号で、前記自動利得制御増幅器の出力の中
の直流バイアス成分が前記バイアス付増幅回路の
バイアス電圧と平衡するように自動利得制御増幅
器のゲインを設定する積分器と、 この積分器の出力を基準値と比較し、比較結果
に応じて劣化検出信号を発生する比較器、 を備えたことを特徴とする光伝送装置。[Claims for Utility Model Registration] The transmitting circuit includes an optical modulator that generates a transmitting optical signal in which a certain DC bias component is superimposed on the input signal, and transmitting light transmitted from the transmitting circuit via an optical transmission line. The receiving circuit that receives the signal includes an automatic gain control amplifier with variable gain that amplifies the optical/electrical conversion signal of the received light and generates a demodulated signal, and a voltage that is obtained by subtracting the bias voltage from the output voltage of this automatic gain control amplifier. A biased amplifier circuit that amplifies and outputs the biased amplifier circuit, and integrates the output voltage of this biased amplifier circuit,
an integrator for setting the gain of the automatic gain control amplifier so that the DC bias component in the output of the automatic gain control amplifier is balanced with the bias voltage of the biased amplifier circuit using an integral signal; An optical transmission device comprising: a comparator that compares with a reference value and generates a deterioration detection signal according to the comparison result.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1977084933U JPS626755Y2 (en) | 1977-06-28 | 1977-06-28 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1977084933U JPS626755Y2 (en) | 1977-06-28 | 1977-06-28 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5412305U JPS5412305U (en) | 1979-01-26 |
| JPS626755Y2 true JPS626755Y2 (en) | 1987-02-17 |
Family
ID=29008087
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1977084933U Expired JPS626755Y2 (en) | 1977-06-28 | 1977-06-28 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS626755Y2 (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52123185A (en) * | 1976-04-09 | 1977-10-17 | Fujitsu Ltd | Optical communication supervisory system |
-
1977
- 1977-06-28 JP JP1977084933U patent/JPS626755Y2/ja not_active Expired
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52123185A (en) * | 1976-04-09 | 1977-10-17 | Fujitsu Ltd | Optical communication supervisory system |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5412305U (en) | 1979-01-26 |
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