JPS62115902A - Optical receiving circuit - Google Patents
Optical receiving circuitInfo
- Publication number
- JPS62115902A JPS62115902A JP60255523A JP25552385A JPS62115902A JP S62115902 A JPS62115902 A JP S62115902A JP 60255523 A JP60255523 A JP 60255523A JP 25552385 A JP25552385 A JP 25552385A JP S62115902 A JPS62115902 A JP S62115902A
- Authority
- JP
- Japan
- Prior art keywords
- light receiving
- receiving element
- output
- preamplifier
- input level
- 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
Landscapes
- Amplifiers (AREA)
- Optical Communication System (AREA)
Abstract
Description
【発明の詳細な説明】
技術分野
本発明は光受信回路に関し、特にダイナミックレンジの
拡大を図る様に構成された光受信回路に関づる。DETAILED DESCRIPTION OF THE INVENTION TECHNICAL FIELD The present invention relates to an optical receiving circuit, and more particularly to an optical receiving circuit configured to expand the dynamic range.
従来技術
従来の光受信回路は、第3図にそのブロック図を示す如
く、光信号を電気信号に変換する受光部1と、この受光
部1による受光出力を増幅する前置増幅器2とからなっ
そいる。かかる構成の光受信回路では、ダイナミックレ
ンジが狭く、よって光入力レベルが大になったときに前
置増幅器2が飽和動作してしまい、受信不能となる欠点
を有している。Prior Art As shown in the block diagram of FIG. 3, a conventional optical receiving circuit consists of a light receiving section 1 that converts an optical signal into an electrical signal, and a preamplifier 2 that amplifies the light output from the light receiving section 1. That's it. An optical receiving circuit having such a configuration has a drawback that the dynamic range is narrow, and therefore, when the optical input level becomes large, the preamplifier 2 operates in saturation, making reception impossible.
発明の目的
そこで、本発明は上記従来のものの欠点を除去すべくな
されたものであって、その目的とするところは、受信す
べぎ光信号の光入力レベルに対するダイナミックレンジ
を拡大することが可能な光受信回路を提供することにあ
る。Purpose of the Invention Therefore, the present invention has been made to eliminate the drawbacks of the conventional ones, and its purpose is to expand the dynamic range of the optical input level of the optical signal to be received. The purpose of the present invention is to provide an optical receiving circuit.
発明の構成
本発明による光受信回路は、受光素子に」;る受光出力
を増幅するための第1及び第2の前置増幅器を設けてお
き、受光素子への光入力レベルに応じて両前買増幅器の
出力を択一的に導出する様構成されている。そして、こ
れ等両前買増幅器が、光入力レベルに対して所定閾値レ
ベルを境にして大及び小なるレベルの領域を夫々分担増
幅する様に予め設計されることにより、全体としてのダ
イナミックレンジの拡大を図ることが可能となるもので
ある。Structure of the Invention The optical receiving circuit according to the present invention is provided with first and second preamplifiers for amplifying the received light output to the light receiving element, and the optical receiving circuit is provided with first and second preamplifiers for amplifying the light receiving output to the light receiving element. The output amplifier is configured to alternatively derive the output of the amplifier. These preamplifiers are designed in advance to amplify large and small level regions, respectively, with a predetermined threshold level as the boundary for the optical input level, thereby increasing the overall dynamic range. This makes it possible to expand.
実施例 以下、図面を用いて本発明の詳細な説明する。Example Hereinafter, the present invention will be explained in detail using the drawings.
第1図は本発明の実施例のブロック図であり、1は光信
号を電気信号に変換するアバランシェフォトダイオード
やPINフォトダイオード等の受光素子を含む受光部で
ある。2及び3は第1及び第2の前置増幅器であり、受
光部1の受光出力を夫々独立して増幅するものである。FIG. 1 is a block diagram of an embodiment of the present invention, and 1 is a light receiving section including a light receiving element such as an avalanche photodiode or a PIN photodiode that converts an optical signal into an electrical signal. Reference numerals 2 and 3 denote first and second preamplifiers, which amplify the light receiving output of the light receiving section 1, respectively.
4は受光部1への光入力レベルを検出するレベル検出回
路であり、光入力レベルの所定閾値を境にして選択回路
5の選択制御信号を発生するものである。この選択回路
5は両前買増幅器2及び3の増幅出力を当該選択制御信
号に応じて択一的に導出する構成となっている。Reference numeral 4 denotes a level detection circuit for detecting the level of light input to the light receiving section 1, and generates a selection control signal for the selection circuit 5 when the light input level reaches a predetermined threshold. This selection circuit 5 is configured to selectively derive the amplified outputs of both advance amplifiers 2 and 3 in accordance with the selection control signal.
かかる構成において、受光部1にて受信された光信号は
電気信号に変換されて第1及び第2の前置増幅器2及び
3へ夫々導出される。ここで、例えば第1の前置増幅2
!82は光入力レベルが小なるときに使用され、また第
2の前置増幅器3は光入力レベルが大なるときに使用さ
れるものとする。In this configuration, an optical signal received by the light receiving section 1 is converted into an electrical signal and guided to the first and second preamplifiers 2 and 3, respectively. Here, for example, the first preamplification 2
! 82 is used when the optical input level is small, and the second preamplifier 3 is used when the optical input level is large.
すなわち、光入力レベルが小さいときには、レベル検出
回路4及び選択回路5によって第1の前置増幅器2の出
力が選択されて回路出力とされ、光入力レベルが大きい
ときは、第2の前置増幅器3の出力が選択されて回路出
力とされるのである。That is, when the optical input level is low, the output of the first preamplifier 2 is selected by the level detection circuit 4 and the selection circuit 5 as the circuit output, and when the optical input level is high, the output of the first preamplifier 2 is selected as the circuit output. The output of No. 3 is selected and used as the circuit output.
更に換言すれば、第1の前置増幅器2は光入力レベルが
所定間値よりも小なる領域に関して分担増幅し、第2の
前置増幅器3は光入力レベルが当該所定閾値よりも大な
る領域を分担増幅するものである。よって、両地幅器2
及び3は各光入力レベル領域の増幅専用に予め設計され
ることになり、結果的に受光レベル範囲の拡大が可能と
なるのである。In other words, the first preamplifier 2 carries out amplification in the region where the optical input level is lower than the predetermined threshold value, and the second preamplifier 3 performs the amplification in the region where the optical input level is higher than the predetermined threshold value. This is to share and amplify the Therefore, both ground breadboards 2
and 3 are designed in advance exclusively for amplification of each optical input level region, and as a result, it becomes possible to expand the received light level range.
第2図は第1図の実施例の具体例を示す回路図であり、
受光部1は受光素子りと抵抗Rとを有し、この抵抗Rは
受光素子りの出力を電流−電圧変換するためのものであ
る。前置増幅器2は、受光素子りのアノード出力を入力
としており、帰還抵抗R[を有する逆相出力の1〜ラン
スインピ一ダンス形前置増幅器である。他の前置増幅器
3は受光素子りのカソード出力を入力とする正相出力の
前置増幅器である。両地幅器2及び3は互いに逆相出力
を発生する様にしたのは、受光素子りのアノード及びカ
ソードの両出力が互いに逆相の関係にあることから、選
択回路5の出力に現われる信号の極性を同一とするため
である。FIG. 2 is a circuit diagram showing a specific example of the embodiment shown in FIG.
The light receiving section 1 has a light receiving element and a resistor R, and this resistor R is for converting the output of the light receiving element from current to voltage. The preamplifier 2 receives the anode output of the light receiving element as an input, and is a 1 to lance impedance type preamplifier with a negative phase output and a feedback resistor R[. The other preamplifier 3 is a positive phase output preamplifier which receives the cathode output of the light receiving element as an input. The reason why the double width dividers 2 and 3 generate outputs with opposite phases to each other is that the outputs of the anode and cathode of the light receiving element are in a relationship with opposite phases to each other, so that the signal appearing at the output of the selection circuit 5 This is to make the polarities the same.
光入力レベル検出回路4は受光素子りのカソード電圧の
DC成分により光入力レベルを検出する構成とされてい
る。The optical input level detection circuit 4 is configured to detect the optical input level based on the DC component of the cathode voltage of the light receiving element.
尚、上記実施例では、第1の前置増幅器2を、光入力レ
ベルが小なる領域を分担する増幅器とし、また第2の前
置増幅器3を、光入力レベルが人なる領域を分担する増
幅器としたが、互いに逆の領域を分担する特性としても
良いことは明白である。In the above embodiment, the first preamplifier 2 is used as an amplifier that serves a region where the optical input level is low, and the second preamplifier 3 is used as an amplifier that serves a region where the optical input level is low. However, it is clear that it is also possible to use characteristics that share opposite areas.
発明の効果
叙上の如く、本発明によれば、光入力レベルが小なる領
域と大なる領域との夫々に適する様に予め設計された前
置増幅器を互いに独立に準備し、光入力レベルに応じて
両前買増幅器を適宜選択して用いることにより、光入力
レベルのダイナミックレンジを実質的に拡大することが
可能となるという効果がある。Effects of the Invention As described above, according to the present invention, preamplifiers designed in advance to be suitable for areas where the optical input level is small and areas where the optical input level is large are prepared independently of each other, and By appropriately selecting and using both advance amplifiers accordingly, it is possible to substantially expand the dynamic range of the optical input level.
第1図は本発明の実施例のブロック図、第2図は第1図
の実施例の具体例の回路図、第3図は従来の光受信回路
のブロック図である。
主要部分の符号の説明
1・・・・・・受光部
2.3・・・・・・前置増幅器
4・・・・・・光入力レベル検出回路
5・・・・・・選択回路FIG. 1 is a block diagram of an embodiment of the present invention, FIG. 2 is a circuit diagram of a specific example of the embodiment of FIG. 1, and FIG. 3 is a block diagram of a conventional optical receiving circuit. Explanation of symbols of main parts 1... Light receiving section 2.3... Preamplifier 4... Optical input level detection circuit 5... Selection circuit
Claims (2)
の前置増幅器と、前記受光素子への光入力レベルを検出
してこのレベルに応じて前記第1及び第2の前置増幅器
の出力を択一的に導出する選択手段とを含むことを特徴
とする光受信回路。(1) First and second amplification of the light receiving output by the light receiving element
a preamplifier; and selection means for detecting the level of light input to the light receiving element and selectively deriving the outputs of the first and second preamplifiers according to this level. Optical receiver circuit.
ベルに対して所定レベルを境にして大及び小なるレベル
の領域を夫々分担増幅する様構成されていることを特徴
とする特許請求の範囲第1項の光受信回路。(2) The first and second preamplifiers are configured to amplify areas of large and small levels, respectively, with a predetermined level as the boundary with respect to the optical input level. An optical receiving circuit according to claim 1.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP60255523A JPS62115902A (en) | 1985-11-14 | 1985-11-14 | Optical receiving circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP60255523A JPS62115902A (en) | 1985-11-14 | 1985-11-14 | Optical receiving circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS62115902A true JPS62115902A (en) | 1987-05-27 |
Family
ID=17279927
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP60255523A Pending JPS62115902A (en) | 1985-11-14 | 1985-11-14 | Optical receiving circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS62115902A (en) |
Cited By (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS62297963A (en) * | 1986-06-18 | 1987-12-25 | Fujitsu Ltd | Allocating circuit for time slot |
JPS6349839U (en) * | 1986-09-18 | 1988-04-04 | ||
JPH01216606A (en) * | 1988-02-24 | 1989-08-30 | Yokogawa Electric Corp | Range switching circuit for photodetection circuit |
JPH0792075A (en) * | 1993-09-27 | 1995-04-07 | Hitachi Electron Eng Co Ltd | Fine grain detecting circuit |
JPH07306133A (en) * | 1994-03-14 | 1995-11-21 | Hitachi Electron Eng Co Ltd | Fine-grain detector |
JPH11127039A (en) * | 1997-10-24 | 1999-05-11 | Nec Corp | Optical reception circuit and optical reception method |
JPH11186971A (en) * | 1997-12-19 | 1999-07-09 | Sumitomo Electric Ind Ltd | Optical network |
JPH11205228A (en) * | 1998-01-13 | 1999-07-30 | Mitsubishi Electric Corp | Alarm monitor circuit for optical fiber amplifier |
WO2007079378A1 (en) * | 2005-12-30 | 2007-07-12 | Bookham Technology Plc | Optical receiver comprising a photodiode digitizer with fast gain switching |
JP2009105840A (en) * | 2007-10-25 | 2009-05-14 | Fujitsu Ltd | Semiconductor circuit device |
JP2009158928A (en) * | 2007-12-03 | 2009-07-16 | Rohm Co Ltd | Illuminance sensor |
JP2012105197A (en) * | 2010-11-12 | 2012-05-31 | Anritsu Corp | Photoelectric conversion circuit |
JP2015155901A (en) * | 2014-02-20 | 2015-08-27 | ジック アーゲー | Distance measuring sensor and method for measuring distance of object in monitoring area |
JP2018097048A (en) * | 2016-12-09 | 2018-06-21 | オリンパス株式会社 | Detector and microscope system |
-
1985
- 1985-11-14 JP JP60255523A patent/JPS62115902A/en active Pending
Cited By (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS62297963A (en) * | 1986-06-18 | 1987-12-25 | Fujitsu Ltd | Allocating circuit for time slot |
JPS6349839U (en) * | 1986-09-18 | 1988-04-04 | ||
JPH01216606A (en) * | 1988-02-24 | 1989-08-30 | Yokogawa Electric Corp | Range switching circuit for photodetection circuit |
JPH0792075A (en) * | 1993-09-27 | 1995-04-07 | Hitachi Electron Eng Co Ltd | Fine grain detecting circuit |
JPH07306133A (en) * | 1994-03-14 | 1995-11-21 | Hitachi Electron Eng Co Ltd | Fine-grain detector |
US6396614B1 (en) | 1997-10-24 | 2002-05-28 | Nec Corporation | Optical signal receiving circuit and method for receiving optical signal |
JPH11127039A (en) * | 1997-10-24 | 1999-05-11 | Nec Corp | Optical reception circuit and optical reception method |
JPH11186971A (en) * | 1997-12-19 | 1999-07-09 | Sumitomo Electric Ind Ltd | Optical network |
JPH11205228A (en) * | 1998-01-13 | 1999-07-30 | Mitsubishi Electric Corp | Alarm monitor circuit for optical fiber amplifier |
WO2007079378A1 (en) * | 2005-12-30 | 2007-07-12 | Bookham Technology Plc | Optical receiver comprising a photodiode digitizer with fast gain switching |
GB2447376A (en) * | 2005-12-30 | 2008-09-10 | Bookham Technology Plc | Optical receiver comprising a photodiode digitizer with fast gain switching |
JP2009105840A (en) * | 2007-10-25 | 2009-05-14 | Fujitsu Ltd | Semiconductor circuit device |
JP2009158928A (en) * | 2007-12-03 | 2009-07-16 | Rohm Co Ltd | Illuminance sensor |
JP2012105197A (en) * | 2010-11-12 | 2012-05-31 | Anritsu Corp | Photoelectric conversion circuit |
JP2015155901A (en) * | 2014-02-20 | 2015-08-27 | ジック アーゲー | Distance measuring sensor and method for measuring distance of object in monitoring area |
JP2018097048A (en) * | 2016-12-09 | 2018-06-21 | オリンパス株式会社 | Detector and microscope system |
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