JPS61167231A - Drive circuit of laser diode - Google Patents
Drive circuit of laser diodeInfo
- Publication number
- JPS61167231A JPS61167231A JP60007373A JP737385A JPS61167231A JP S61167231 A JPS61167231 A JP S61167231A JP 60007373 A JP60007373 A JP 60007373A JP 737385 A JP737385 A JP 737385A JP S61167231 A JPS61167231 A JP S61167231A
- Authority
- JP
- Japan
- Prior art keywords
- output
- peaking
- circuit
- negative feedback
- laser diode
- 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
- H04B10/50—Transmitters
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/06—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium
- H01S5/068—Stabilisation of laser output parameters
- H01S5/0683—Stabilisation of laser output parameters by monitoring the optical output parameters
- H01S5/06835—Stabilising during pulse modulation or generation
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Electronic Switches (AREA)
- Optical Communication System (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分桁〕
この発明は、レーザダイオード（以下、ＬＤと略記する
）のパルス伝送光出力波形の波形整形を行なうレーザダ
イオードの駆動回路に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Industrial Applications] The present invention relates to a laser diode drive circuit that shapes the pulse transmission light output waveform of a laser diode (hereinafter abbreviated as LD).
第５図は例えば特開昭５６−４５０８８号公報に示され
た従来のレーザダイオードの駆動回路を示す構成図でア
シ、図において１はＬＤ、２はフォトダイオード（以下
、ＰＤと略記する）％３はＬＤｌの発光出力の一部’Ｉ
ｋＰＤ２に導くための光導波路、４はＰＤ２が光導波路
３を介してＬＤ１０発光出力の一部を受光して出力する
出力電流の直流分および交流分を検出する受光電流検出
回路。FIG. 5 is a block diagram showing a conventional laser diode drive circuit disclosed in, for example, Japanese Unexamined Patent Publication No. 56-45088. 3 is part of the light emission output of LD1'I
4 is a light receiving current detection circuit for detecting the direct current and alternating current components of the output current that the PD 2 receives and outputs a part of the light emitted from the LD 10 via the optical waveguide 3;
５は上記の受光電流検出回路４の出力によって負帰還が
かけらｎている負帰還制御回路で、ＬＤ１のバイアス電
流および変調信号電流の制御を行なうものである。６は
ＬＤ変調信号入力端子、７ａおよび７ｂは接地端子、８
は電源でおる。Reference numeral 5 denotes a negative feedback control circuit in which negative feedback is applied by the output of the light receiving current detection circuit 4, which controls the bias current and modulation signal current of the LD1. 6 is an LD modulation signal input terminal, 7a and 7b are ground terminals, 8
is powered on.
従来のレーザダイオードの駆動回路は上記のように構成
さｌｉｔ、ＬＤ１ｉｉ負帰還制御回路５によって、発振
閾値電流付近のバイアス電流を供給され、かつＬＤ変調
信号入力端子６より入力される変調入力信号に応じた発
光動作をしているものと仮定する。このとき、ＬＤ１０
発光出力の一部は、光導波路３を介してＰＤ２に伝送さ
れ、該ＰＤ２にて受光される。そして、ＰＤ２からはＬ
Ｄｌが送出する光信号出力に比例した受光電流が出力さ
れ、その直流成分および変調信号成分（交流分）は。A conventional laser diode drive circuit is configured as described above, and is supplied with a bias current near the oscillation threshold current by the LD1ii negative feedback control circuit 5, and is supplied with a modulation input signal input from the LD modulation signal input terminal 6. It is assumed that the light emitting operation is performed accordingly. At this time, LD10
A part of the light emission output is transmitted to the PD 2 via the optical waveguide 3 and received by the PD 2. And from PD2, L
A light receiving current proportional to the optical signal output sent by Dl is output, and its DC component and modulation signal component (AC component) are:
受光電流検出回路４を介して制御信号として、負帰還制
御回路５に負帰還される。上記の制御信号によって負帰
還がかかることによｊ５．ＬＤｌの発光特性の非直線性
の補償や、平均発光出力および変調元信号出力の安定化
、あるいはＬＤｌの、４特性の改善等がなされる。It is negatively fed back to the negative feedback control circuit 5 as a control signal via the light receiving current detection circuit 4. By applying negative feedback by the above control signal, j5. Compensation for the nonlinearity of the light emission characteristics of the LD1, stabilization of the average light emission output and modulation source signal output, or improvement of four characteristics of the LD1 are performed.
第６図は、上記した従来のレーザダイオードの駆動回路
に、変調信号入力としてピーキングの伴なったパルス波
形がＬＤ変調信号入力端子６より入力された場合の各部
の動作波形である。図において、アは変調入力信号波形
、イは受光電流検出回路４の出力波形、つはＬＤｌの発
光出力波形、そして、工はＰＤ２の電流増倍率で常に一
定の値でおる。FIG. 6 shows operating waveforms of various parts when a pulse waveform with peaking is input as a modulation signal input from the LD modulation signal input terminal 6 to the conventional laser diode drive circuit described above. In the figure, A is the modulated input signal waveform, B is the output waveform of the light receiving current detection circuit 4, B is the light emission output waveform of the LD1, and C is the current multiplication factor of the PD 2, which is always a constant value.
上記のような従来のレーザダイオードの駆動回路では、
ＰＤ２の受光電流は常にＬＤｌの発光出力に比例したも
のになっておシ、従って負帰還制御回路５にかかる負帰
還量も常にＬＤｌの発光出力に比例し′ｆｃものでめつ
に０このπめ１例えばピーキングを伴なったパルス波形
が変調信号入力として入力された場合、負帰還がかから
ない場合のＬＤｌの発光出力、該発光出力の一部を受光
してＰＤ２が出力する受光電流、該受光電流を受けて受
光電流検出回路４が出力する制御信号の何’ｎにも第６
図に示したように上記の変調入力信号と同じ割合でピー
キングが伴なってしまい、従って負帰還がかかった後の
ＬＤ１０発光出力において％ｌ。In the conventional laser diode drive circuit as described above,
The light receiving current of PD2 is always proportional to the light emitting output of LDl, and therefore the amount of negative feedback applied to the negative feedback control circuit 5 is also always proportional to the light emitting output of LDl. For example, when a pulse waveform with peaking is input as a modulation signal input, the light emission output of the LD1 without negative feedback, the light reception current output by PD2 after receiving a part of the light emission output, and the light reception The control signal outputted by the light receiving current detection circuit 4 in response to the current has a sixth control signal.
As shown in the figure, peaking occurs at the same rate as the above modulated input signal, and therefore the LD10 light emission output after negative feedback is %l.
ピーキングは上記の変調入力信号と同様に存在するとい
う問題点があった。There is a problem in that peaking exists similarly to the modulated input signal described above.
この発明は、かかる問題点を解決するためになされ７ｔ
％ので、変調入力信号として振幅変動の伴なったパルス
波形が入力された場合でも、ＬＤの発光出力には波形整
形されて振幅変動の除去されたパルス波形が得らｎるレ
ーザダイオードの駆動回路を得ることを目的とする。This invention was made to solve such problems.
%, so even if a pulse waveform with amplitude fluctuations is input as a modulation input signal, a pulse waveform with waveform shaping and amplitude fluctuations removed is obtained from the light emission output of the LD. The purpose is to obtain.
この発明に係るレーザダイードの駆動回路は。 A laser diode drive circuit according to the present invention.
受光素子ｉしてアバランシェフォトダイオード（以下、
ＡＰＤと略記する〕を用い、該ＡＰＤの出力電流を検出
する受光電流検出回路の出力信号によって制御さ才し、
上記のＡＰＤのカソード電圧を供給するカソード電圧供
給回路を備えたものである。The light receiving element i is an avalanche photodiode (hereinafter referred to as
(abbreviated as APD)] is controlled by the output signal of a light receiving current detection circuit that detects the output current of the APD,
This device includes a cathode voltage supply circuit that supplies the cathode voltage of the APD described above.
この発明においては、ＬＤの発光出力のモニタＩＡＰＤ
で行ない、かつ上記のＡＰＤＯカソード電圧を変化させ
ることによって該ＡＰＤの電流増倍率を制御し、これに
より負帰還制御回路にかかる負帰還量の制御を行なうの
で、ＬＤの発光出力波形の波形整形を行なうことができ
る。In this invention, the monitor IAPD of the light emission output of the LD
By changing the above-mentioned APDO cathode voltage, the current multiplication factor of the APD is controlled, thereby controlling the amount of negative feedback applied to the negative feedback control circuit, so the waveform shaping of the light emission output waveform of the LD is performed. can be done.
第１図はこの発明の一実施例を示す構成′図でめり、２
ＡはＡＰＤ、４Ａは光導波路３を介して上記のＡＰ Ｄ
２ ＡがＬＤｌの発光出力の一部を受光して出力する
出力電流の直流分および交流分を検出する受光電流検出
回路、７は接地端子、９は上記の受光電流検出回路４Ａ
の出力によって制御される上記のＡＰＤ２Ａのカソード
電圧供給回路でおる。FIG. 1 is a configuration diagram showing an embodiment of the present invention.
A is the APD, and 4A is the above AP D via the optical waveguide 3.
2 A is a light receiving current detection circuit that detects the direct current and alternating current components of the output current that is received by receiving a part of the light emission output of the LDl, 7 is a ground terminal, and 9 is the above light receiving current detecting circuit 4A.
The cathode voltage supply circuit of the APD 2A is controlled by the output of the APD 2A.
上記のように構成されたレーザダイオードの駆動回路に
おいて、ＬＤｌは負帰還制御回路５によって１発振閾値
電流付近のバイアス電流を供給され、かつＬＤ変調信号
入力端子６より入力される変調入力信号に応じた発光動
作をしているものと仮定する。上記のＬＤ１０発光出力
の一部は、光導波路３を介してＡＰＤ２Ａに伝送され、
該ＡＰＤ２Ａにて受光される。そして、ＡＰＤ２Ａがら
はＬＤｌが送出する元信号出力と、このときのカソード
電圧供給回路９から上記のＡＰＤ２Ａのカソードに印加
されているカソード電圧によって決定されるＡＰＤ２Ａ
の電流増倍率に比例した受光電流が送出される。該受光
電流は、受光電流検出回路４Ａを介して制御信号となシ
、上記のカソード電圧供給回路９を制御する。また、一
方では、受光電流検出回路４Ａの出力の制御信号は、負
帰還制御回路５に負帰還される。上記の構成のものに、
従来のレーザダイオードの駆動回路と同様に。In the laser diode drive circuit configured as described above, LDl is supplied with a bias current near the one-oscillation threshold current by the negative feedback control circuit 5, and responds to the modulation input signal input from the LD modulation signal input terminal 6. Assume that the light is emitting light. A part of the above-mentioned LD10 light emission output is transmitted to the APD2A via the optical waveguide 3,
The light is received by the APD 2A. The APD2A is determined by the original signal output sent by the LDl and the cathode voltage applied from the cathode voltage supply circuit 9 to the cathode of the APD2A at this time.
A light receiving current proportional to the current multiplication factor is transmitted. The light-receiving current is converted into a control signal via the light-receiving current detection circuit 4A to control the cathode voltage supply circuit 9 described above. On the other hand, the control signal output from the light receiving current detection circuit 4A is negatively fed back to the negative feedback control circuit 5. For the above configuration,
Similar to the conventional laser diode drive circuit.
ピーキングを伴なったパルス波形を変調信号入力とじて
入力し７ｃ場合、負帰還がかからない場合のＬＤｌの発
光出力には、上記の変調信号入力のピーキングがその１
１現われる。このとき、ＡＰＤ２Ａのカソード電圧およ
び該ＡＰＤ２Ａの電流増倍率は一定でろるので、上記の
４元出方の一部を受光してＡＰＤ２Ａが出力する受光電
流に、仄いで受光電流検出回路４Ａの出力の制御信号に
も上記のピーキングはそのままの形で存在することとな
る。そして、上記の制御信号によってカソード電圧供給
回路９に制御がかがシ、このとき、上記のＡＰＤ２Ａの
カソード電圧および該ＡＰＤ２Ａの電流増倍率ＶＣ％ｌ
上記のピーキングが現われることとなる。さらに、上記
のＡＰＤ２Ａの電流増倍率にもピーキングがかかったた
めに、核ＡＰＤ２Ａの送出する受光電流および受光電流
検出回路４Ａの出力の制御信号上では、上記のピーキン
グが当初に比べると一層強調された形で存在することと
なる。When a pulse waveform with peaking is input as a modulation signal input 7c, the peaking of the modulation signal input described above is one of the peaks in the light emission output of the LDl when negative feedback is not applied.
1 appears. At this time, since the cathode voltage of the APD 2A and the current multiplication factor of the APD 2A are constant, the output of the light receiving current detection circuit 4A is mixed with the light receiving current output by the APD 2A by receiving a part of the above four-element output. The above-mentioned peaking also exists in the control signal as it is. Then, the cathode voltage supply circuit 9 is controlled by the above control signal, and at this time, the cathode voltage of the APD 2A and the current multiplication factor VC%l of the APD 2A are controlled.
The above peaking will appear. Furthermore, since peaking was applied to the current multiplication factor of the APD 2A, the peaking was more emphasized on the control signal of the light receiving current sent out by the nuclear APD 2A and the output of the light receiving current detection circuit 4A than at the beginning. It will exist in the form.
すなわち、ピーキングによって、ＬＤｌの変調信号入力
の振幅が一定振幅より大きな時はよシ大きな負帰還量が
、小さな時はよシ小さな負帰還量が負帰還制御回路５に
かかることとなる。この制御信号によって、負帰還制御
回路５に負帰還がかけられるから、従来のものに比べて
振幅改善効果が大幅に上昇し、ピーキングの伴なわない
パルス波形がＬＤｌの発光出力波形として得らｎる。That is, due to peaking, a large amount of negative feedback is applied to the negative feedback control circuit 5 when the amplitude of the modulation signal input to the LDl is larger than a certain amplitude, and a smaller amount of negative feedback is applied when it is small. Since negative feedback is applied to the negative feedback control circuit 5 by this control signal, the amplitude improvement effect is greatly increased compared to the conventional one, and a pulse waveform without peaking can be obtained as the light emission output waveform of the LDl. Ru.
第２図は、このときの各部の動作波形を示しπもので、
アは変調入力信号波形、イは受光電流検出回路４Ａの出
力波形、つはＬ Ｄ １の発光出カ波形、工はＡＰＤ２
Ａの電流増倍率である。Figure 2 shows the operating waveforms of each part at this time.
A is the modulation input signal waveform, B is the output waveform of the light receiving current detection circuit 4A, is the light emission output waveform of LD1, and B is the APD2 waveform.
This is the current multiplication factor of A.
なお、第３図に示すように、ＡＰＤ２Ａの受光電流検出
回路４Ａとカッ−ド電圧供給回路９との間に、サンプリ
ングゲート１ｏを設け、ピーキングがかかる時点でのみ
上記のカソード電圧供給回路９に制御信号が伝送される
ように構成しても同様の動作を期待できる。なお、第４
図に、−例としてピーキングを伴なったパルス波形を変
調信号入力として入力した場合の、各部の動作波形を示
す。図において、アは変調式カ信号波形、イは受光電流
検出回路４Ａの出力波形、つはＬＤｌの発光出力波形、
工はＡＰＤ２Ａの電流増倍率である。As shown in FIG. 3, a sampling gate 1o is provided between the photodetection current detection circuit 4A of the APD 2A and the quad voltage supply circuit 9, and the above-mentioned cathode voltage supply circuit 9 is connected only when peaking occurs. A similar operation can be expected even if the configuration is such that a control signal is transmitted. In addition, the fourth
The figure shows the operating waveforms of each part when a pulse waveform with peaking is input as a modulation signal input, for example. In the figure, A is the modulated power signal waveform, B is the output waveform of the light receiving current detection circuit 4A, and is the light emission output waveform of LDl.
is the current multiplication factor of APD2A.
なお、パルス波形以外の変調信号入力に対しても、上記
と同様の動作が期待できるものである。Note that the same operation as described above can be expected for modulated signal inputs other than pulse waveforms.
この発明は以上説明したとおシ、ＬＤの発光出力のモニ
タをＡＰＤによって行ない、該ＡＰＤの電流増倍率の制
御を伴なって上記のＬＤのバイアス電流を供給する負帰
還制御回路に負帰還をかける構成としたので、上記のＬ
Ｄの発光出力波形の波形整形を行なうことができる効果
がおる。As described above, the present invention monitors the light emission output of the LD using the APD, controls the current multiplication factor of the APD, and applies negative feedback to the negative feedback control circuit that supplies the bias current of the LD. configuration, the above L
There is an effect that the waveform of the light emission output waveform of D can be shaped.
第１図はこの発明の一実施例を示すレーザダイオードの
駆動回路の構成図、第２図は一実施例の各部の動作波形
図、第３図はこの発明の他の実施例を示す構成図、第４
図は他の実施例の各部の動作板星図、第５図は従来のレ
ーザダイオードの駆動回路を示す構成図、第６図は従来
の各部の動作波形図である。
図において、１はレーザダイオード、２Ａはアバランシ
ェフォトダイオード、３は光導波路、４Ａは受光電流検
出回路、５は負帰還制御回路、９はカソード電圧供給回
路、１０はサンプリングゲートである。
なお、各図中同一符号は同一マタは相当部分を示す。
特許出願人 三菱電機株式会社
第１図
第２図
第３図
１０：プソデリンク゛ケ′ニド
第４図
第５図
第６図
二へ−一□−一FIG. 1 is a configuration diagram of a laser diode drive circuit showing one embodiment of the present invention, FIG. 2 is an operation waveform diagram of each part of the embodiment, and FIG. 3 is a configuration diagram showing another embodiment of the invention. , 4th
FIG. 5 is a block diagram showing the operation of each part of another embodiment, FIG. 5 is a block diagram showing a conventional laser diode drive circuit, and FIG. 6 is a diagram of operation waveforms of each part of the conventional example. In the figure, 1 is a laser diode, 2A is an avalanche photodiode, 3 is an optical waveguide, 4A is a light receiving current detection circuit, 5 is a negative feedback control circuit, 9 is a cathode voltage supply circuit, and 10 is a sampling gate. Note that the same reference numerals in each figure indicate corresponding parts. Patent Applicant: Mitsubishi Electric Corporation Figure 1 Figure 2 Figure 3 Figure 10: Psode link diagram Figure 4 Figure 5 Figure 6 Figure 2-1 □-1
Claims (2)
伝送する光導波路と、上記受光素子の出力電流を検出す
る受光電流検出回路と、該受光電流検出回路の出力によ
り上記レーザダイオードの上記発光出力を制御する負帰
還制御回路とから構成されたレーザダイオードの駆動回
路において、上記受光素子としてアバランシエフオトダ
イオードを用い、上記受光電流検出回路の出力信号によ
つて制御される上記アバランシエフオトダイオードのカ
ソード電圧を供給するカソード電圧供給回路を備えたこ
とを特徴とするレーザダイオードの駆動回路。(1) An optical waveguide that transmits a part of the light emission output of the laser diode to a light receiving element, a light receiving current detection circuit that detects the output current of the light receiving element, and an output of the light receiving current detecting circuit that controls the light emission of the laser diode. In a laser diode drive circuit comprising a negative feedback control circuit for controlling output, an avalanche photodiode is used as the light receiving element, and the avalanche photodiode is controlled by an output signal of the light receiving current detection circuit. A laser diode drive circuit comprising a cathode voltage supply circuit that supplies a cathode voltage of .
流検出回路と上記カソード電圧供給回路との間にサンプ
リングゲートを設け、ピーキングがかかる時点でのみ上
記カソード電圧供給回路に上記受光電流検出回路からの
制御信号が伝送されるようにしたことを特徴とする特許
請求の範囲第（１）項記載のレーザダイオードの駆動回
路。(2) A sampling gate is provided between the light reception current detection circuit and the cathode voltage supply circuit of the avalanche photodiode, and a control signal from the light reception current detection circuit is sent to the cathode voltage supply circuit only when peaking occurs. 2. A laser diode drive circuit according to claim 1, wherein the laser diode drive circuit is configured to transmit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60007373A JPS61167231A (en) | 1985-01-21 | 1985-01-21 | Drive circuit of laser diode |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60007373A JPS61167231A (en) | 1985-01-21 | 1985-01-21 | Drive circuit of laser diode |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS61167231A true JPS61167231A (en) | 1986-07-28 |
Family
ID=11664162
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60007373A Pending JPS61167231A (en) | 1985-01-21 | 1985-01-21 | Drive circuit of laser diode |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61167231A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0818428A (en) * | 1994-06-30 | 1996-01-19 | Nec Corp | Composite photocoupler |
| US6031219A (en) * | 1997-01-07 | 2000-02-29 | Nec Corporation | Bias voltage supply circuit for photoelectric converting element and photodetection circuit |
-
1985
- 1985-01-21 JP JP60007373A patent/JPS61167231A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0818428A (en) * | 1994-06-30 | 1996-01-19 | Nec Corp | Composite photocoupler |
| US6031219A (en) * | 1997-01-07 | 2000-02-29 | Nec Corporation | Bias voltage supply circuit for photoelectric converting element and photodetection circuit |
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