JPS6121634A - Optical reception circuit - Google Patents
Optical reception circuitInfo
- Publication number
- JPS6121634A JPS6121634A JP59141947A JP14194784A JPS6121634A JP S6121634 A JPS6121634 A JP S6121634A JP 59141947 A JP59141947 A JP 59141947A JP 14194784 A JP14194784 A JP 14194784A JP S6121634 A JPS6121634 A JP S6121634A
- Authority
- JP
- Japan
- Prior art keywords
- preamplifier
- circuit
- component
- impedance
- optical
- 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
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/60—Receivers
- H04B10/66—Non-coherent receivers, e.g. using direct detection
- H04B10/69—Electrical arrangements in the receiver
- H04B10/697—Arrangements for reducing noise and distortion
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- 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ＰＩＮフォトダイオード（ＰＩＮ−ＰＤ）、ア
バランシェフォトダイオード（ＡＰＤ）等の受光素子を
使用した光受信回路に関するものである。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an optical receiving circuit using a light receiving element such as a PIN photodiode (PIN-PD) or an avalanche photodiode (APD).
従来例の構成とその問題点
ＰＩＮ−ＰＤ、ＡＰＤ等の受光素子と前置増幅器とから
なる光受信回路の従来例を第１図に示す。Structure of a conventional example and its problems FIG. 1 shows a conventional example of an optical receiving circuit consisting of a light receiving element such as a PIN-PD or an APD, and a preamplifier.
第１図において、１は受光素子のバイアス電源、２はＰ
ＩＮ−ＰＤ、ＡＰＤ等の受光素子、３は受光素子２のバ
イアス抵抗、４は前置増幅器、５は前置増幅器４の入力
抵抗である。In Fig. 1, 1 is the bias power supply of the light receiving element, 2 is P
A light receiving element such as IN-PD or APD, 3 is a bias resistance of the light receiving element 2, 4 is a preamplifier, and 5 is an input resistance of the preamplifier 4.
前記構成による従来例において広帯域、低雑音の光受信
回路を実現するためには以下の条件を満足する必要があ
る。In the conventional example with the above configuration, the following conditions must be satisfied in order to realize a wideband, low-noise optical receiving circuit.
（］）受光素子２のバイアス抵抗Ｒｂは低雑音化するだ
めに大きくする。(]) The bias resistance Rb of the light-receiving element 2 is made large to reduce noise.
（２）受光素子２の接合容量、回路中の浮遊容量による
高域特性の劣化を防ぐだめ、前置増幅器４の入力抵抗Ｒ
ｉはなるべく小さくする。(2) The input resistance R of the preamplifier 4 is used to prevent deterioration of high-frequency characteristics due to the junction capacitance of the photodetector 2 and stray capacitance in the circuit.
Make i as small as possible.
この結果バイアス抵抗Ｒｂの値は前置増幅器４の入力抵
抗Ｒｉに比較して大きくなり、光−電気変換部と前置増
幅部との間にインピーダンス不整合を生じ、受信Ｃ／Ｎ
が劣化するという欠点を有していた。As a result, the value of the bias resistor Rb becomes larger than the input resistance Ri of the preamplifier 4, causing impedance mismatch between the optical-to-electrical converter and the preamplifier, and the received C/N
It had the disadvantage that it deteriorated.
発明の目的
本発明は上記従来の欠点を除去するものであり、電気−
光変換部と前置増幅部のインピータンスが異なるために
生じる信号の伝送損失を軽減せしめ低雑音の光受信回路
を提供することを目的とするものである。OBJECTS OF THE INVENTION The present invention eliminates the above-mentioned drawbacks of the conventional
It is an object of the present invention to provide a low-noise optical receiving circuit that reduces signal transmission loss caused by the difference in impedance between an optical conversion section and a preamplification section.
発明の構成
本発明は、前記目的を達成するために、光−電気変換部
と前置増幅部との間に無損失の受動素子によって構成さ
れる整合回路を挿入して両者を結合することにより、イ
ンピーダンス不整合に基づく伝送損失を軽減する効果を
得るものである。Structure of the Invention In order to achieve the above-mentioned object, the present invention includes a matching circuit composed of lossless passive elements inserted between the optical-to-electrical converter and the preamplifier to couple the two. , the effect of reducing transmission loss due to impedance mismatch is obtained.
実施例の説明
第２図は本発明の一実施例における光受信回路を示して
いる。光電気変換部は受光素子の接合容量、配線による
誘導成分により、又前置増幅部は回路の浮遊容量、配線
による誘導成分、増幅器の入力インピーダンス等によシ
必ずしも純抵抗成分でなく、リアクタンス成分も同時に
存在する。DESCRIPTION OF THE EMBODIMENTS FIG. 2 shows an optical receiving circuit in one embodiment of the present invention. The photoelectric conversion section is affected by the junction capacitance of the light receiving element and inductive components due to wiring, and the preamplifier section is not necessarily a pure resistance component but a reactance component due to the stray capacitance of the circuit, inductive components due to wiring, input impedance of the amplifier, etc. exist at the same time.
第２図において６．８はそのリアクタンス成分を除去す
るりアクタンス補償回路である。７は値の異なる抵抗成
分をステップアップもしくわステップダウンして整合を
取るインピーダンス変換器である。In FIG. 2, 6.8 is an actance compensation circuit for removing the reactance component. Reference numeral 7 denotes an impedance converter that steps up or steps down resistance components having different values for matching.
第１図の従来例において受光素子が供給可能な有能電力
は次式で与えられる。In the conventional example shown in FIG. 1, the available power that can be supplied by the light receiving element is given by the following equation.
Ｐｏ：有能電力 Ｒｂ：バイアス抵抗 ■ ＝開放端電圧 一方負荷Ｒ１に実際に供給される受信電力は次式％式％ Ｒ１：前置増幅器の入力抵抗 （１）、（２）より不整合損失は次式で与えられる。Po: Capable power Rb: bias resistance ■ = open end voltage On the other hand, the received power actually supplied to load R1 is calculated using the following formula: % R1: Preamplifier input resistance From (1) and (2), the mismatch loss is given by the following equation.
従ってＲｂとＲｉが異なる従来例では（３）式による不
整合損失を生じるが、上記実施例のようにリアクタンス
補償回路６．８、インピーダンス変換器７を用いた場合
には使用帯域内において、上記損失を低減することがで
き効率良く受信信号を負荷に供給することが可能になる
。Therefore, in the conventional example where Rb and Ri are different, a mismatch loss occurs according to equation (3), but when the reactance compensation circuit 6.8 and the impedance converter 7 are used as in the above embodiment, the above Loss can be reduced and the received signal can be efficiently supplied to the load.
発明の効果
本発明は上記のような構成であり、従来例に比較して、
光−電気変換部と前置増幅部を結合する際に生じる不整
合損失を大幅に低減することができ、低雑音・高能率な
光受信回路を実現することが可能であり、その実用的価
値は大きいものである０Effects of the Invention The present invention has the above-mentioned configuration, and compared to the conventional example,
The mismatch loss that occurs when coupling the optical-to-electrical converter and the preamplifier can be significantly reduced, making it possible to realize a low-noise, high-efficiency optical receiver circuit, and its practical value. is large 0
第１図は従来の光受信回路の電気回路図、第２図は本発
明の一実施例における光受信回路の電気回路図である。
１・・・・・・バイアス電源、２・・・・・・受光素子
、３・・・・・・バイアス抵抗、４・・・・・・前置増
幅器、訃・・・・・前置増幅器の入力抵抗、６．８・・
・・・・リアクタンス補償回路、７・・・・・・インピ
ーダンス変換器。FIG. 1 is an electrical circuit diagram of a conventional optical receiving circuit, and FIG. 2 is an electrical circuit diagram of an optical receiving circuit according to an embodiment of the present invention. 1... Bias power supply, 2... Light receiving element, 3... Bias resistor, 4... Preamplifier, 2... Preamplifier Input resistance of 6.8...
...Reactance compensation circuit, 7... Impedance converter.
Claims (1)
換部と、この光−電気変換部において光から電気へ変換
された信号成分を増幅する前置増幅部と、無損失な受動
素子で構成され上記光−電気変換部と上記前置増幅部と
を結合するインピーダンス整合回路とからなる光受信回
路。Consists of an optical-to-electrical converter that has a light-receiving element such as a PIN-PD or APD, a preamplifier that amplifies the signal component converted from light to electricity in this optical-to-electrical converter, and a lossless passive element. and an impedance matching circuit that couples the optical-to-electrical converter and the preamplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59141947A JPS6121634A (en) | 1984-07-09 | 1984-07-09 | Optical reception circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59141947A JPS6121634A (en) | 1984-07-09 | 1984-07-09 | Optical reception circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6121634A true JPS6121634A (en) | 1986-01-30 |
Family
ID=15303835
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59141947A Pending JPS6121634A (en) | 1984-07-09 | 1984-07-09 | Optical reception circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6121634A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01500713A (en) * | 1986-08-29 | 1989-03-09 | ヒユーズ・エアクラフト・カンパニー | Impedance-matched electro-optical components using lossless elements |
| JPH04259110A (en) * | 1990-09-28 | 1992-09-14 | Hughes Aircraft Co | Reconstitutable rf matching circuit |
| EP0520308A2 (en) * | 1991-06-27 | 1992-12-30 | Alcatel SEL Aktiengesellschaft | Amplifying circuit device |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5446578A (en) * | 1977-09-20 | 1979-04-12 | Hitachi Denshi Ltd | Signal transmitting circuit |
-
1984
- 1984-07-09 JP JP59141947A patent/JPS6121634A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5446578A (en) * | 1977-09-20 | 1979-04-12 | Hitachi Denshi Ltd | Signal transmitting circuit |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01500713A (en) * | 1986-08-29 | 1989-03-09 | ヒユーズ・エアクラフト・カンパニー | Impedance-matched electro-optical components using lossless elements |
| JPH04259110A (en) * | 1990-09-28 | 1992-09-14 | Hughes Aircraft Co | Reconstitutable rf matching circuit |
| EP0520308A2 (en) * | 1991-06-27 | 1992-12-30 | Alcatel SEL Aktiengesellschaft | Amplifying circuit device |
| EP0520308A3 (en) * | 1991-06-27 | 1994-03-02 | Sel Alcatel Ag |
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