JPH05211478A - Optical signal input interruption detection circuit - Google Patents
Optical signal input interruption detection circuitInfo
- Publication number
- JPH05211478A JPH05211478A JP4040257A JP4025792A JPH05211478A JP H05211478 A JPH05211478 A JP H05211478A JP 4040257 A JP4040257 A JP 4040257A JP 4025792 A JP4025792 A JP 4025792A JP H05211478 A JPH05211478 A JP H05211478A
- Authority
- JP
- Japan
- Prior art keywords
- amplifier
- signal
- detection circuit
- optical signal
- peak detector
- 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.)
- Granted
Links
Landscapes
- Optical Communication System (AREA)
Abstract
Description
【0001】[0001]
【産業上の利用分野】本発明は、光信号入力断検出回路
に関する。より詳細には、本発明は、光通信設備の中継
器または受信器等において入力光信号の途絶を検出する
ために使用する光信号入力断検出回路の新規な構成に関
する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical signal input break detection circuit. More specifically, the present invention relates to a novel configuration of an optical signal input break detection circuit used for detecting interruption of an input optical signal in a repeater or a receiver of optical communication equipment.
【0002】[0002]
【従来の技術】図2は、光通信の受信回路における受信
光信号入力部周辺の典型的な構成を示す図である。尚、
この回路は、NRZ(Non Retern to Zero)信号のよう
に、受信信号からクロック信号を抽出する信号方式に対
応している。2. Description of the Related Art FIG. 2 is a diagram showing a typical configuration around a received optical signal input section in a receiving circuit for optical communication. still,
This circuit is compatible with a signal system that extracts a clock signal from a received signal, such as an NRZ (Non Retern to Zero) signal.
【0003】同図に示すように、この回路は、光電変換
器1、増幅器2、識別器3、狭帯域フィルタ4および遅
延回路5から主に構成されている。増幅器2は、所定の
利得を有する増幅器であり、光電変換器1の出力信号を
その入力に受けて、自身の出力を識別器3および狭帯域
フィルタ4に接続されている。狭帯域フィルタ4の出力
は、遅延回路5を介して、識別器3のクロック入力に接
続されている。識別器3はD型フリップフロップ等によ
り構成することができ、その出力がこの光受信回路の出
力となる。As shown in the figure, this circuit is mainly composed of a photoelectric converter 1, an amplifier 2, a discriminator 3, a narrow band filter 4 and a delay circuit 5. The amplifier 2 is an amplifier having a predetermined gain, receives the output signal of the photoelectric converter 1 at its input, and connects its own output to the discriminator 3 and the narrow band filter 4. The output of the narrow band filter 4 is connected to the clock input of the discriminator 3 via the delay circuit 5. The discriminator 3 can be composed of a D-type flip-flop or the like, and its output becomes the output of this optical receiving circuit.
【0004】以上のように構成された受信回路におい
て、光電変換器1は、受信した光信号を電気信号に変換
して出力する。光電変換器1の出力した信号は、増幅器
2により増幅された後、識別器3と狭帯域フィルタ4と
に入力される。狭帯域フィルタ4は入力された信号から
クロック信号を抽出する。このクロック信号は、遅延回
路5により位相を調整された上で識別器3に供給され
る。そこで、識別器3は、増幅器2から供給された信号
をクロック信号に従って出力し、かくして入力光信号に
対応した電気信号が再生される。尚、原理的には必要な
いが、実際の回路では、増幅器2と狭帯域フィルタ4と
の間にも遅延回路6が挿入されることが一般的である。In the receiving circuit configured as described above, the photoelectric converter 1 converts the received optical signal into an electric signal and outputs it. The signal output from the photoelectric converter 1 is amplified by the amplifier 2 and then input to the discriminator 3 and the narrow band filter 4. The narrow band filter 4 extracts a clock signal from the input signal. This clock signal is adjusted in phase by the delay circuit 5 and then supplied to the discriminator 3. Therefore, the discriminator 3 outputs the signal supplied from the amplifier 2 in accordance with the clock signal, and thus the electric signal corresponding to the input optical signal is reproduced. Although not necessary in principle, in an actual circuit, the delay circuit 6 is generally inserted between the amplifier 2 and the narrow band filter 4.
【0005】更に、図2に示すように、この種の光信号
受信回路には光信号入力断検出回路71 が設けられる場
合がある。この検出回路71 は、光伝送路の断線等の不
測の理由により受信回路に対する光信号入力が途絶した
場合に、これを検出してアラーム信号を発生する回路で
ある。図2では、光信号入力断検出回路71 を狭帯域フ
ィルタ4の後段に接続しているが、図中に光信号入力断
検出回路72 として示すように増幅器2の出力に接続し
てもよい。Further, as shown in FIG. 2, an optical signal input detection circuit 7 1 may be provided in this type of optical signal receiving circuit. The detection circuit 71, when the optical signal input to the receiving circuit due to unforeseen reasons such as breakage of the optical transmission path is disrupted, a circuit for generating an alarm signal by detecting this. In FIG. 2, the optical signal input break detection circuit 7 1 is connected to the subsequent stage of the narrow band filter 4, but even if it is connected to the output of the amplifier 2 as shown as the optical signal input break detection circuit 7 2 in the figure. Good.
【0006】図3は、上述のような光信号入力断検出回
路71 または72 の典型的な構成を示す図である。FIG. 3 is a diagram showing a typical configuration of the optical signal input break detection circuit 7 1 or 7 2 as described above.
【0007】同図に示すように、この回路は、順次接続
された光電変換器71、増幅器72、ピーク検出器73および
比較器74により構成されており、比較器74には閾値信号
が供給されている。尚、図2に示した光受信回路では、
光電変換器71および増幅器72を、光受信回路の光電変換
器1および増幅器2と兼用している。As shown in the figure, this circuit is composed of a photoelectric converter 71, an amplifier 72, a peak detector 73 and a comparator 74 which are connected in sequence, and a threshold signal is supplied to the comparator 74. ing. Incidentally, in the optical receiving circuit shown in FIG.
The photoelectric converter 71 and the amplifier 72 are also used as the photoelectric converter 1 and the amplifier 2 of the optical receiving circuit.
【0008】以上のように構成された光信号入力断検出
回路は、増幅器72により光電変換器71の出力を増幅した
後ピーク検出器73によりピークを抽出し、そのピーク値
と閾値とを比較器74において比較する。ここで、閾値が
適切に設定されていれば、入力光信号が途絶してピーク
値が小さくなったときに、比較器74がアラーム信号を出
力する。In the optical signal input break detection circuit configured as described above, the amplifier 72 amplifies the output of the photoelectric converter 71, the peak detector 73 extracts the peak, and the peak value and the threshold value are compared. Compare at 74. Here, if the threshold value is properly set, the comparator 74 outputs an alarm signal when the input optical signal is interrupted and the peak value becomes small.
【0009】[0009]
【発明が解決しようとする課題】しかしながら、実際に
は、閾値信号自体が安定であっても、温度特性や電源電
圧の変動等の影響により、特にピーク検出器の特性が変
動し易いため、上述のような検出回路の構成では、温度
変化や特性変動あるいは電源電圧の変動等に対して動作
が不安定になる場合がある。また、比較器への入力信号
の時定数が大きく異なるため、電源リップル等のノイズ
に対して比較器が誤動作しやすいという欠点があった。However, in practice, even if the threshold signal itself is stable, the characteristics of the peak detector are apt to change due to the influence of temperature characteristics and fluctuations of the power supply voltage. In such a configuration of the detection circuit, the operation may become unstable with respect to temperature changes, characteristic changes, power supply voltage changes, and the like. Moreover, since the time constants of the input signals to the comparators are greatly different, there is a drawback that the comparators are likely to malfunction due to noise such as power supply ripple.
【0010】そこで、本発明は、上記従来技術の問題点
を解決し、温度・電源電圧の変動、および電源リップル
等の雑音に対しても安定に動作する新規な光信号入力段
検出回路を提供することをその目的としている。Therefore, the present invention provides a novel optical signal input stage detection circuit which solves the above-mentioned problems of the prior art and operates stably against noise such as temperature / power supply voltage fluctuations and power supply ripples. The purpose is to do.
【0011】[0011]
【課題を解決するための手段】本発明に従うと、受信し
た光信号を電気信号に変換する光電変換器と、該光電変
換器の出力信号のピークを検出するピーク検出器と、該
ピーク検出器の出力信号を一方の入力に受ける比較器と
を具備し、該比較器において受信した光信号の途絶を検
出してアラーム信号を出力するように構成された光信号
入力断検出回路において、所定の閾値信号を受ける前記
増幅器と実質的に同じ仕様の第2の増幅器と、該第2の
増幅器の出力信号のピークを検出する前記ピーク検出器
と実質的に同じ仕様のピーク検出器とを備え、該第2の
ピーク検出器の出力が、前記比較器の他方の入力に接続
されていることを特徴とする光信号入力断検出回路が提
供される。According to the present invention, a photoelectric converter for converting a received optical signal into an electric signal, a peak detector for detecting a peak of an output signal of the photoelectric converter, and the peak detector. A comparator for receiving the output signal of one of its inputs at one input, and detecting the interruption of the optical signal received by the comparator and outputting an alarm signal, A second amplifier that has substantially the same specifications as the amplifier that receives the threshold signal; and a peak detector that has substantially the same specifications as the peak detector that detects the peak of the output signal of the second amplifier, There is provided an optical signal input break detection circuit characterized in that the output of the second peak detector is connected to the other input of the comparator.
【0012】[0012]
【作用】本発明に係る光信号入力断検出回路は、閾値信
号が、増幅器およびピーク検出器を介して比較器に入力
されるように構成されていることにその主要な特徴があ
る。The main feature of the optical signal input break detection circuit according to the present invention is that the threshold signal is input to the comparator through the amplifier and the peak detector.
【0013】即ち、光信号入力断検出回路においては、
被検出信号と閾値信号との1対の信号が比較器に入力さ
れる。ここで、従来の検出回路では、被検出信号は増幅
器およびピーク検出器を介して入力されているが、閾値
信号は比較器に直接入力されていた。このため、特定の
状態で調整された閾値信号は、温度、電源電圧の変動等
により増幅器やピーク検出器の特性が変動したときに入
力される信号に対しては、もはや有効な閾値とはなり得
なかった。That is, in the optical signal input disconnection detection circuit,
A pair of signals of the detected signal and the threshold signal is input to the comparator. Here, in the conventional detection circuit, the detected signal is input through the amplifier and the peak detector, but the threshold signal is directly input to the comparator. Therefore, the threshold signal adjusted in a specific state is no longer a valid threshold for the signal input when the characteristics of the amplifier or peak detector fluctuate due to fluctuations in temperature, power supply voltage, etc. I didn't get it.
【0014】これに対して、本発明に係る検出回路で
は、閾値信号も増幅器およびピーク検出器を介して入力
される。ここで使用される増幅器およびピーク検出器
は、比較器の被検出信号を処理するために使用されてい
るものと同じ仕様のものであり、温度変化等に対して両
者は同じように特性を変化する。従って、比較器に対し
て入力される閾値信号は、被検出信号の変動と同じよう
に変動するので、比較器は常に有効に信号断を検出する
ことができる。On the other hand, in the detection circuit according to the present invention, the threshold signal is also input via the amplifier and the peak detector. The amplifier and peak detector used here have the same specifications as those used to process the detected signal of the comparator, and both change their characteristics in the same way against changes in temperature. To do. Therefore, the threshold signal input to the comparator fluctuates in the same manner as the fluctuation of the detected signal, so that the comparator can always effectively detect the signal loss.
【0015】以下、実施例を挙げて本発明をより具体的
に説明するが、以下の開示は本発明の一実施例に過ぎ
ず、本発明の技術的範囲を何ら限定するものではない。Hereinafter, the present invention will be described in more detail with reference to examples, but the following disclosure is merely an example of the present invention and does not limit the technical scope of the present invention.
【0016】[0016]
【実施例】図1は本発明に係る光信号入力断検出回路の
具体的な構成例を示す図である。尚、同図において、図
3に示した検出回路と共通の構成要素には同じ参照番号
を付している。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a diagram showing a concrete configuration example of an optical signal input break detection circuit according to the present invention. In the figure, the same reference numerals are given to the constituent elements common to those of the detection circuit shown in FIG.
【0017】同図に示すように、本発明に係る光信号入
力断検出回路において、光電変換器71から比較器74に至
る被検出信号の伝播経路は、図3に示した従来の検出回
路と同じである。一方、閾値信号は、増幅器72aおよび
ピーク検出器73aを介して比較器74に入力されている。
ここで、増幅器72と72aおよびピーク検出器73と73a
は、それぞれ互いに同じ仕様のものが使用されている。As shown in the figure, in the optical signal input break detection circuit according to the present invention, the propagation path of the detected signal from the photoelectric converter 71 to the comparator 74 is the same as that of the conventional detection circuit shown in FIG. Is the same. On the other hand, the threshold signal is input to the comparator 74 via the amplifier 72a and the peak detector 73a.
Here, amplifiers 72 and 72a and peak detectors 73 and 73a
Have the same specifications as each other.
【0018】以上のように構成された検出回路において
は、温度変動等により増幅器72およびピーク検出器73の
特性が変動したときには、増幅器72aおよびピーク検出
器73aの特性も同様に変動する。従って、比較器74に入
力される閾値信号は、特性の変化した増幅器72およびピ
ーク検出器73により出力された被検出信号に対しても有
効な閾値となる。In the detection circuit configured as described above, when the characteristics of the amplifier 72 and the peak detector 73 change due to temperature fluctuations, the characteristics of the amplifier 72a and the peak detector 73a also change. Therefore, the threshold signal input to the comparator 74 becomes an effective threshold for the detected signal output by the amplifier 72 and the peak detector 73 whose characteristics have changed.
【0019】また、電源からリップル等の雑音が印加さ
れた場合でも、比較器74に対する1対の入力の時定数が
互いに等しいので、その雑音は比較器への同相入力とし
て除去される。Even when noise such as ripple is applied from the power supply, since the time constants of the pair of inputs to the comparator 74 are equal to each other, the noise is removed as an in-phase input to the comparator.
【0020】従って、上述のような構成の被信号入力断
検出回路は、温度・電源電圧変動を完全に補償し、且
つ、雑音による比較器の誤動作が効果的に防止される。Therefore, the signal input disconnection detection circuit having the above-described configuration completely compensates for temperature / power supply voltage fluctuations and effectively prevents malfunction of the comparator due to noise.
【0021】以上のように構成された光信号入力段検出
回路は、図2に示した光受信回路において、光信号入力
段検出回路71 または72 としてそのまま使用できる。The optical signal input stage detection circuit configured as described above can be used as it is as the optical signal input stage detection circuit 7 1 or 7 2 in the optical receiving circuit shown in FIG.
【0022】[0022]
【発明の効果】以上説明したように、本発明に係る光信
号入力断検出回路は、被検出信号を処理する増幅器およ
びピーク検出器と同じ仕様の増幅器およびピーク検出器
を介して閾値信号を入力するので、増幅器およびピーク
検出器の特性変動や電源電圧の変動にが完全に補償され
る。また、電源から発生したリップル等の雑音による誤
動作も防止される。従って、その動作安定性は極めて高
い。As described above, the optical signal input break detection circuit according to the present invention inputs the threshold signal through the amplifier and peak detector having the same specifications as the amplifier and peak detector for processing the detected signal. Therefore, the characteristic variation of the amplifier and the peak detector and the variation of the power supply voltage are completely compensated. In addition, malfunction due to noise such as ripple generated from the power supply is also prevented. Therefore, its operational stability is extremely high.
【0023】更に、その構成は簡潔であり、取扱いも容
易である。従って、光通信等の分野において、例えば、
中継器や受信器の光信号入力断検出回路として有利に使
用することができる。Further, its structure is simple and easy to handle. Therefore, in the field of optical communication, for example,
It can be advantageously used as an optical signal input disconnection detection circuit of a repeater or a receiver.
【図1】本発明に係る光信号入力断検出回路の構成例を
示す図である。FIG. 1 is a diagram showing a configuration example of an optical signal input break detection circuit according to the present invention.
【図2】一般的な光信号受信回路の構成を示す図であ
る。FIG. 2 is a diagram showing a configuration of a general optical signal receiving circuit.
【図3】従来の光信号断検出回路の典型的な構成を示す
図である。FIG. 3 is a diagram showing a typical configuration of a conventional optical signal loss detection circuit.
1、71・・・光電変換器、 2、72、72a・・・増
幅器、3・・・識別器、 4・・・狭帯域
フィルタ、5、6・・・遅延回路、 71 、72
・・・光信号入力断検出回路、73、73a・・・ピーク検
出器、 74・・・比較器1, 71 ... Photoelectric converter, 2, 72, 72a ... Amplifier, 3 ... Discriminator, 4 ... Narrow band filter, 5, 6 ... Delay circuit, 7 1 , 7 2
... Optical signal input disconnection detection circuit, 73, 73a ... Peak detector, 74 ... Comparator
Claims (1)
変換器と、該光電変換器の出力信号を増幅器で増幅して
そのピークを検出するピーク検出器と、該ピーク検出器
の出力信号を一方の入力に受ける比較器とを具備し、該
比較器において受信した光信号の途絶を検出してアラー
ム信号を出力するように構成された光信号入力断検出回
路において、 所定の閾値信号を受ける前記増幅器と実質的に同じ仕様
の第2の増幅器と、該第2の増幅器の出力信号のピーク
を検出する前記ピーク検出器と実質的に同じ仕様のピー
ク検出器とを備え、該第2のピーク検出器の出力が、前
記比較器の他方の入力に接続されていることを特徴とす
る光信号入力断検出回路。1. A photoelectric converter for converting a received optical signal into an electric signal, a peak detector for amplifying an output signal of the photoelectric converter by an amplifier to detect its peak, and an output signal for the peak detector. And a comparator for receiving at one of the inputs, an optical signal input disconnection detection circuit configured to detect the interruption of the optical signal received by the comparator and output an alarm signal. A second amplifier having substantially the same specifications as the receiving amplifier; and a peak detector having substantially the same specifications as the peak detector for detecting the peak of the output signal of the second amplifier, The output of the peak detector is connected to the other input of the comparator, and an optical signal input break detection circuit is provided.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP04025792A JP3232622B2 (en) | 1992-01-30 | 1992-01-30 | Optical signal input disconnection detection circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP04025792A JP3232622B2 (en) | 1992-01-30 | 1992-01-30 | Optical signal input disconnection detection circuit |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH05211478A true JPH05211478A (en) | 1993-08-20 |
JP3232622B2 JP3232622B2 (en) | 2001-11-26 |
Family
ID=12575626
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP04025792A Expired - Fee Related JP3232622B2 (en) | 1992-01-30 | 1992-01-30 | Optical signal input disconnection detection circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP3232622B2 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2016103845A1 (en) * | 2014-12-22 | 2016-06-30 | ソニー株式会社 | Signal detector, electronic device, and method for controlling signal detector |
CN113556106A (en) * | 2021-07-28 | 2021-10-26 | 东南大学 | Hysteresis comparator with threshold voltage capable of being adjusted in self-adaptive mode |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP6992151B2 (en) | 2018-02-20 | 2022-02-15 | 平田機工株式会社 | Stop device, transfer device and work system |
-
1992
- 1992-01-30 JP JP04025792A patent/JP3232622B2/en not_active Expired - Fee Related
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2016103845A1 (en) * | 2014-12-22 | 2016-06-30 | ソニー株式会社 | Signal detector, electronic device, and method for controlling signal detector |
US10444261B2 (en) | 2014-12-22 | 2019-10-15 | Sony Corporation | Signal detector, electronic device, and method for controlling signal detector |
CN113556106A (en) * | 2021-07-28 | 2021-10-26 | 东南大学 | Hysteresis comparator with threshold voltage capable of being adjusted in self-adaptive mode |
Also Published As
Publication number | Publication date |
---|---|
JP3232622B2 (en) | 2001-11-26 |
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