JPH0477021A - Modulation detector - Google Patents
Modulation detectorInfo
- Publication number
- JPH0477021A JPH0477021A JP2187638A JP18763890A JPH0477021A JP H0477021 A JPH0477021 A JP H0477021A JP 2187638 A JP2187638 A JP 2187638A JP 18763890 A JP18763890 A JP 18763890A JP H0477021 A JPH0477021 A JP H0477021A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- detector
- differential amplifier
- modulation degree
- amplitude
- 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.)
- Pending
Links
- 230000003287 optical effect Effects 0.000 claims abstract description 20
- 238000001514 detection method Methods 0.000 abstract description 6
- 239000000284 extract Substances 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 210000003127 knee Anatomy 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Landscapes
- Optical Communication System (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は変調度検出器に関し、特に、光出力信号の光強
度変調を利用し、副信号を伝送することのできる光送信
方式に関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a modulation degree detector, and more particularly to an optical transmission system capable of transmitting a sub-signal by utilizing optical intensity modulation of an optical output signal.
従来、強度変調された光信号の変調度を検出する回路は
、第２図に示すように、光信号を光電流に変換するホト
ダイオードｌと、ホトタイオードの出力である光電流を
電気信号に変換する電流電圧変換器（ＩＮ）２と、Ｉ／
Ｖの出力信号波形を観測するための波形観測器７とを有
している。Conventionally, a circuit for detecting the degree of modulation of an intensity-modulated optical signal has a photodiode L that converts the optical signal into a photocurrent, and a circuit that converts the photocurrent output from the photodiode into an electrical signal, as shown in Figure 2. Current-voltage converter (IN) 2 and I/
It has a waveform observation device 7 for observing the output signal waveform of V.
この従来の変調度を検出する方法においては、電流電圧
変換器２の出力波形を観測器７にて測定する場合、第３
図に示すように振幅変調された光信号は以下に示す式か
ら変調度を算出していた。In this conventional method of detecting the degree of modulation, when the output waveform of the current-voltage converter 2 is measured by the observation device 7, the third
As shown in the figure, the modulation degree of the amplitude-modulated optical signal was calculated using the formula shown below.
変調度＝−ｘｉｏｏニー×１００
Ａ＋Ｂ Ｘ
ただし、Ａ、Ｂはそれぞれ光信号の振幅の最大値、最小
値、Ｙは変調信号の振幅、でＸ＝−十Ｂ。Modulation degree = -xioo knee x 100 A+B
Ａ−Ｂ Ｙ＝−十Ｂである。A-B Y=-10B.
しかし、変調度を調整する際に、目視測定、のため波形
観測器の目盛読み取り誤差による変調度の精度が低いと
いう問題点があった。However, when adjusting the degree of modulation, there was a problem in that the accuracy of the degree of modulation was low due to errors in reading the scale of the waveform observation device due to visual measurement.
本発明の検出器は従来の波形観測器の代わりに、Ｉ／Ｖ
の出力信号の平均値検出器と、また、■／Ｖの出力信号
を高域遮断し、その信号の振幅を検出する低域通過フィ
ルタおよびピーク検出器と、平均値検出器出力とピーク
検出器出力を比較するため差動増幅器を備えている。The detector of the present invention replaces the conventional waveform observation device with I/V
an average value detector for the output signal of , a low pass filter and a peak detector that cut off the high frequency range of the output signal of /V and detect the amplitude of the signal, an average value detector output and a peak detector Equipped with a differential amplifier to compare outputs.
次に本発明の実施例について図面を参照して説明する。 Next, embodiments of the present invention will be described with reference to the drawings.
第１図は本発明の実施例を示すブロック図である。FIG. 1 is a block diagram showing an embodiment of the present invention.
一般にディジタル信号である主信号を伝送する場合、光
送信器において光パルスの有無（“１”“０パ）を信号
として送信している。また、副信号（主信号の周波数に
比べて十分に低い周波数）を伝送するために、光送信側
では主信号の光パルスの振幅を副信号によって強度変調
して第３図に示すような光信号をつくり、受信側ではそ
の光信号を電気信号に変換し、包絡線検波することによ
って副信号を再生している。Generally, when transmitting a main signal, which is a digital signal, an optical transmitter transmits the presence or absence of an optical pulse (“1” or “0”) as a signal. In order to transmit low frequencies), the optical transmitting side modulates the amplitude of the optical pulse of the main signal with the sub signal to create an optical signal as shown in Figure 3, and the receiving side converts the optical signal into an electrical signal. The sub-signal is regenerated by converting it and performing envelope detection.
本発明の実施例は第３図に示す光信号の変調度を検圧す
る回路である。An embodiment of the present invention is a circuit for detecting the degree of modulation of an optical signal as shown in FIG.
第１図のホトダイオード１には第３図に示す光信号が入
力される。電流電圧変換器２の出力からは従来の検出方
法のように第３図の波形が観測される。平均値検出器３
は第３図に示す波形の平均値−を検出する。ただし、主
信号のチューティ比は５０％と仮定している。ま、た、
低域通過フィルタ４およびピーク検出器５は包路線検波
回路で、フィルタ４で副信号成分を抽出しピーク検出器
５でピーク値検出することによって第３図中の副信号の
振幅Ｙが検出される。An optical signal shown in FIG. 3 is input to the photodiode 1 shown in FIG. The waveform shown in FIG. 3 is observed from the output of the current-voltage converter 2 as in the conventional detection method. Average value detector 3
detects the average value of the waveform shown in FIG. However, it is assumed that the tuteity ratio of the main signal is 50%. Also,
The low-pass filter 4 and the peak detector 5 are envelope line detection circuits, and the amplitude Y of the sub-signal in FIG. 3 is detected by extracting the sub-signal component with the filter 4 and detecting the peak value with the peak detector 5. Ru.
従って、差動増幅器６によって、−とＹを比較すること
により、変調度が電気信号として出力される。すなわち
、ピーク検出器５の出力信号の振幅ＹがＸ／２に比べて
大きければ、それたけ変調度が大きく、このことば差動
増幅器６の出力信号振幅に現われる。Therefore, by comparing - and Y by the differential amplifier 6, the degree of modulation is output as an electrical signal. That is, if the amplitude Y of the output signal of the peak detector 5 is larger than X/2, the degree of modulation is correspondingly large, and this appears in the output signal amplitude of the differential amplifier 6.
以上説明したように本発明の検出器は、光信号の電気信
号に処理後、平均値検出器、低域通過フィルタ、ピーク
検出器、差動増幅器を用いて、変調度が差動増幅器の出
力の信号となるようにしたので、変調度の精度が高くな
るという効果を有する。As explained above, the detector of the present invention uses an average value detector, a low-pass filter, a peak detector, and a differential amplifier after processing an optical signal into an electrical signal, so that the degree of modulation is determined by the output of the differential amplifier. This has the effect of increasing the accuracy of the modulation degree.
第１図は本発明の検出器のブロック図、第２図は従来の
変調度検出回路を示すブロック図、第３図はＰＤに入力
される光信号の波形図である。
ｌ・・・・・・ホトダイオード（Ｐ Ｄ）、２・・・・
・電流電圧変換器（Ｉ ／Ｖ）、３・・・・・・平均値
検出器（ＡＶＥｄｅｔ）、４・・・・・・低域通過フィ
ルタ（ＬＰＦ）、５・・・・・・ピーク検出器（ＰＥＡ
Ｋｄ ｅ ｔ）、６・・・・・・差動増幅器、７・・・
・・・波形観測器。
第１図
第２図
代理人 弁理士 内 原 晋FIG. 1 is a block diagram of a detector according to the present invention, FIG. 2 is a block diagram showing a conventional modulation degree detection circuit, and FIG. 3 is a waveform diagram of an optical signal input to a PD. l...Photodiode (PD), 2...
・Current voltage converter (I/V), 3...Average value detector (AVEdet), 4...Low pass filter (LPF), 5...Peak detection vessel (PEA
Kd et), 6...Differential amplifier, 7...
...Waveform observation device. Figure 1 Figure 2 Agent Susumu Uchihara, patent attorney
Claims (2)
記光電流を電気信号に変換する電流電圧変換器と、前記
電流電圧変換器の出力信号の平均値を検出する平均値検
出器と、前記電流電圧変換器の出力信号の高域周波数を
遮断するための低域通過フィルタと、前記フィルタ通過
後の信号の振幅を検出するピーク検出器と、前記平均値
検出器の出力信号と、前記ピーク検出器の出力信号を比
較するための差動増幅器とを備えることを特徴とする変
調度検出器。(1) a photodiode that converts an optical signal into a photocurrent; a current-voltage converter that converts the photocurrent into an electrical signal; an average value detector that detects the average value of the output signal of the current-voltage converter; a low-pass filter for cutting off high frequencies of the output signal of the current-voltage converter; a peak detector for detecting the amplitude of the signal after passing through the filter; an output signal of the average value detector; A modulation degree detector comprising: a differential amplifier for comparing output signals of the detectors.
光パルス信号であることを特徴とする請求項（１）記載
の変調度検出器。(2) The modulation degree detector according to claim (1), wherein the optical signal is an optical pulse signal whose amplitude is modulated by a low frequency signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2187638A JPH0477021A (en) | 1990-07-16 | 1990-07-16 | Modulation detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2187638A JPH0477021A (en) | 1990-07-16 | 1990-07-16 | Modulation detector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0477021A true JPH0477021A (en) | 1992-03-11 |
Family
ID=16209619
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2187638A Pending JPH0477021A (en) | 1990-07-16 | 1990-07-16 | Modulation detector |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0477021A (en) |
-
1990
- 1990-07-16 JP JP2187638A patent/JPH0477021A/en active Pending
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