JPH0282141U

JPH0282141U -

Info

Publication number: JPH0282141U
Application number: JP1988161579U
Authority: JP
Priority date: 1988-12-13
Filing date: 1988-12-13
Publication date: 1990-06-25

Description

[Brief explanation of the drawing]

第１図は本考案になる光受信回路の一実施例を
示す回路図、第２図はピンフオトダイオードの逆
バイアス電圧対接合容量特性、第３図は第１図に
示した光受信回路各部の波形図、第４図は変形例
の一部を示す回路図、第５図は光受信回路の基本
的な構成を示す図、第６図はピンフオトダイオー
ドの等価回路、第７図は第５図の等価回路、第８
図、第９図、第１０図Ａ及びＢ、第１１図は従来
例を示す図である。１……ピンフオトダイオード、２……インダク
タンス素子、３……負荷抵抗、６……アンプ、７
……鋸波発生回路、８……スイツチ、１１……レ
ベル検出器、１２……コンパレータ、１４……キ
ヤリア検出回路、１５……アンド回路、１６……
単安定マルチバイブレータ。 Figure 1 is a circuit diagram showing an embodiment of the optical receiver circuit according to the present invention, Figure 2 is the reverse bias voltage versus junction capacitance characteristic of a pin photodiode, and Figure 3 is each part of the optical receiver circuit shown in Figure 1. 4 is a circuit diagram showing a part of a modified example, FIG. 5 is a diagram showing the basic configuration of an optical receiver circuit, FIG. 6 is an equivalent circuit of a pin photo diode, and FIG. 7 is a circuit diagram showing a part of a modified example. Equivalent circuit of Figure 5, No. 8
9, FIG. 10A and B, and FIG. 11 are diagrams showing conventional examples. 1...Pin photodiode, 2...Inductance element, 3...Load resistance, 6...Amplifier, 7
... sawtooth wave generation circuit, 8 ... switch, 11 ... level detector, 12 ... comparator, 14 ... carrier detection circuit, 15 ... AND circuit, 16 ...
Monostable multivibrator.

補正平１．１２．５実用新案登録請求の範囲を次のように補正する
。光伝送装置における光受信回路であつて、接合容量を有する受光素子自体とこの受光素子
に直列または並列に接続されたインダクタンス素
子とで構成された共振回路と、前記受光素子にバ
イアス電圧を印加する可変バイアス電圧供給回路
と、受光素子からの受信信号のレベルに応じて前
記可変バイアス電圧供給回路を制御するバイアス
電圧制御回路とからなり、前記受信信号のレベルに応じて前記バイアス電
圧が可変されて、前記共振回路の共振周波数と光
伝送の伝送周波数とが一致するように構成したこ
とを特徴とする光受信回路。図面の簡単な説明を次のように補正する。明細書１８頁１７行目の「レベル検出器」を「
レベル検出回路」と補正する。Amendment 1.12.5. The scope of claims for utility model registration is amended as follows. An optical receiving circuit in an optical transmission device, which includes a resonant circuit composed of a light receiving element itself having a junction capacitance, an inductance element connected in series or parallel to this light receiving element, and applying a bias voltage to the light receiving element. The variable bias voltage supply circuit includes a variable bias voltage supply circuit and a bias voltage control circuit that controls the variable bias voltage supply circuit according to the level of the received signal from the light receiving element, and the bias voltage is varied according to the level of the received signal. . An optical receiving circuit characterized in that the resonant frequency of the resonant circuit is configured to match the transmission frequency of optical transmission . The brief description of the drawing has been amended as follows. “Level detector” on page 18, line 17 of the specification is “
Level detection circuit” and correction.

Claims

[Claims for Utility Model Registration] An optical receiving circuit in an optical transmission device, comprising: a resonant circuit comprising a light receiving element itself having a junction capacitance and an inductance element connected in series or parallel to the light receiving element; The variable bias voltage supply circuit includes a variable bias voltage supply circuit that applies a bias voltage to the light receiving element, and a bias voltage control circuit that controls the variable bias voltage supply circuit according to the level of the received signal from the light receiving element. An optical receiving circuit characterized in that the bias voltage is varied so that the resonant frequency of the resonant circuit and the transmission frequency of the optical transmission match.