JP2000150952A - Optical transmitter - Google Patents
Optical transmitterInfo
- Publication number
- JP2000150952A JP2000150952A JP32697498A JP32697498A JP2000150952A JP 2000150952 A JP2000150952 A JP 2000150952A JP 32697498 A JP32697498 A JP 32697498A JP 32697498 A JP32697498 A JP 32697498A JP 2000150952 A JP2000150952 A JP 2000150952A
- Authority
- JP
- Japan
- Prior art keywords
- light
- emitting element
- receiving
- light emitting
- circuit
- 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.)
- Granted
Links
Landscapes
- Led Device Packages (AREA)
- Led Devices (AREA)
- Photo Coupler, Interrupter, Optical-To-Optical Conversion Devices (AREA)
- Solid State Image Pick-Up Elements (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は光送信器に係わり、
特にレセプタクルに光コネクタプラグを嵌合して用いる
光ファイバ通信用光送信器に好適なものに関する。The present invention relates to an optical transmitter,
In particular, the present invention relates to an optical transmitter suitable for an optical fiber communication using an optical connector plug fitted in a receptacle.
【０００２】[0002]
【従来の技術】従来の光ファイバ通信に用いる光送信器
は、図３に示されるような構成を備えていた。光ファイ
バ７が実装された光コネクタプラグ１０が、レセプタク
ル５に嵌合された状態で使用される。レセプタクル５に
は、ＬＥＤ等の発光素子１と、発光素子１を駆動する送
信回路１２とが実装され、透明樹脂により成形されたパ
ッケージ１８が組み込まれている。パッケージ１８には
発光素子１及び送信回路１２に電源を供給するための外
部端子９が設けられており、図示されていないプリント
基板等に実装される。2. Description of the Related Art A conventional optical transmitter used for optical fiber communication has a configuration as shown in FIG. The optical connector plug 10 on which the optical fiber 7 is mounted is used in a state where it is fitted to the receptacle 5. The light emitting element 1 such as an LED and the transmitting circuit 12 for driving the light emitting element 1 are mounted on the receptacle 5, and a package 18 formed of a transparent resin is incorporated therein. The package 18 is provided with an external terminal 9 for supplying power to the light emitting element 1 and the transmission circuit 12, and is mounted on a printed board (not shown) or the like.
【０００３】レセプタクル５内において、送信回路１２
により発光素子１が駆動されて光信号が出力されると、
光コネクタプラグ１０内の光ファイバ７を通して図示さ
れていない装置へ伝送される。In the receptacle 5, a transmitting circuit 12
Drives the light emitting element 1 to output an optical signal,
The data is transmitted to a device (not shown) through the optical fiber 7 in the optical connector plug 10.
【０００４】[0004]
【発明が解決しようとする課題】しかし、従来の光送信
器には次のような問題があった。発光素子１を駆動させ
た状態で、光コネクタプラグ７をレセプタクル５から抜
くと、発光素子１から出射された光が外部に放出され、
人間の目に入ると損傷を起こす可能性がある。特に、伝
送距離を長くするには光の出力を大きくせざるを得ない
が、このような場合には目を損傷する危険性が高くな
る。また、可視光を出力する場合、具体的には６５０ｎ
ｍの波長の光をプラスティックファイバで伝送する場合
に問題となりやすい。However, the conventional optical transmitter has the following problems. When the optical connector plug 7 is removed from the receptacle 5 while the light emitting element 1 is driven, light emitted from the light emitting element 1 is emitted to the outside,
May enter the human eye and cause damage. In particular, in order to increase the transmission distance, the light output must be increased, but in such a case, the risk of damaging the eyes increases. When outputting visible light, specifically, 650 n
A problem is likely to occur when transmitting light having a wavelength of m through a plastic fiber.
【０００５】ＩＥＣ（国際電機標準会議）では安全基準
として、１００ｍｍ離れたところで直径７ｍｍの面積に
入射する光の強度が−６．５ｄＢ・ｍ以下であることを
規定している。しかし、光信号の伝送に必要な出力を得
るためにはこの基準を満たすことが困難であった。特
に、レンズを用いて出射ＮＡ（Numerical Aperture）を
絞ったり、発光素子としてＬＥＤの替わりにレーザダイ
オードを用いた場合には、基準を満たすことができない
可能性が高かった。[0005] The IEC (International Electrotechnical Commission) stipulates, as a safety standard, that the intensity of light incident on an area having a diameter of 7 mm at a distance of 100 mm is -6.5 dB · m or less. However, it has been difficult to satisfy this criterion in order to obtain an output required for transmitting an optical signal. In particular, when the emission NA (Numerical Aperture) is narrowed using a lens, or when a laser diode is used as a light emitting element instead of an LED, there is a high possibility that the standard cannot be satisfied.
【０００６】本発明は上記事情に鑑み、発光素子から光
を出射した状態で光コネクタプラグをレセプタクルから
外した場合にも、人間の目を損傷する危険性がない光送
信器を提供することを目的とする。The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an optical transmitter which has no risk of damaging human eyes even when an optical connector plug is removed from a receptacle in a state where light is emitted from a light emitting element. Aim.
【０００７】[0007]
【課題を解決するための手段】本発明の光送信器は、光
を出力する発光素子と、前記発光素子を駆動する駆動電
流を前記発光素子に与える送信回路と、光を受光する
と、この光の光量に対応した受光信号を出力する受光素
子と、前記受光信号を与えられ、前記光量が所定値より
も大きいことを前記受光信号が示す場合は前記発光素子
から所望の光強度が得られ、前記光量が前記所定値以下
であることを前記受光信号が示す場合は前記発光素子の
光強度が基準値以下になるように前記送信回路を制御す
る受信回路とを実装したレセプタクルを備え、前記レセ
プタクルに前記光コネクタプラグが嵌合している間、前
記発光素子が出力した光の一部が前記光コネクタプラグ
に反射して前記受光素子に受光されることを特徴として
いる。According to the present invention, there is provided an optical transmitter comprising: a light emitting element for outputting light; a transmitting circuit for supplying a drive current for driving the light emitting element to the light emitting element; A light-receiving element that outputs a light-receiving signal corresponding to the light amount, and the light-receiving signal is given, and when the light-receiving signal indicates that the light amount is larger than a predetermined value, a desired light intensity is obtained from the light-emitting element; A receiving circuit that controls the transmitting circuit so that the light intensity of the light emitting element is equal to or less than a reference value when the light receiving signal indicates that the light amount is equal to or less than the predetermined value; While the optical connector plug is fitted, a part of the light output by the light emitting element is reflected by the optical connector plug and received by the light receiving element.
【０００８】ここで、前記送信回路は前記駆動電流を生
成して前記発光素子に与える増幅器を含み、前記受信回
路は前記受光信号を与えられ、前記駆動電流が前記受光
信号に対応するように前記増幅器を制御する制御素子を
含んでいてもよい。Here, the transmitting circuit includes an amplifier for generating the driving current and supplying the driving current to the light emitting element, and the receiving circuit is supplied with the light receiving signal, and the driving circuit corresponds to the light receiving signal so that the driving current corresponds to the light receiving signal. A control element for controlling the amplifier may be included.
【０００９】また、前記受光素子及び前記受信回路、あ
るいは前記送信回路及び前記受光素子及び前記受信回路
が同一半導体チップ上に形成されていてもよい。Further, the light receiving element and the receiving circuit, or the transmitting circuit, the light receiving element and the receiving circuit may be formed on the same semiconductor chip.
【００１０】[0010]
【発明の実施の形態】以下、本発明のー実施の形態につ
いて図面を参照して説明する。図１に、本実施の形態に
よる光送信器の断面構造を示す。図３に示された従来の
光送信器では、レセプタクル５に実装された透明樹脂か
ら成るパッケージ１８に、発光素子１と発光素子１を駆
動する送信回路１２とが搭載されている。これに対し、
本実施の形態では受光素子３及び送信回路２に加えて、
さらに受光素子３と受信回路４とがパッケージ８に搭載
され、送信回路２が受信回路４によって制御される点が
相違する。他の従来の装置と同一の要素には同一の番号
を付して説明を省略する。Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a cross-sectional structure of the optical transmitter according to the present embodiment. In the conventional optical transmitter shown in FIG. 3, a light emitting element 1 and a transmission circuit 12 for driving the light emitting element 1 are mounted on a package 18 made of a transparent resin mounted on the receptacle 5. In contrast,
In the present embodiment, in addition to the light receiving element 3 and the transmission circuit 2,
Furthermore, the difference is that the light receiving element 3 and the receiving circuit 4 are mounted on the package 8 and the transmitting circuit 2 is controlled by the receiving circuit 4. The same elements as those of the other conventional devices are denoted by the same reference numerals, and description thereof is omitted.
【００１１】図２に、発光素子１、受光素子３、受信回
路４及び送信回路２を含む回路構成を示す。発光素子１
は例えば発光ＬＥＤで構成され、送信回路２の出力端子
と接地端子との間にアノードとカソードが接続されてお
り、送信回路２から駆動電流を与えられその電流値に応
じた発光強度で発光する。受光素子３は受信回路４に接
続されており、受光素子３が受光するとこの光量に応じ
た電流値を有する受光信号が受信回路４に与えられる。
受信回路４は例えば増幅器等の制御素子から構成され、
受光信号を与えられるとこの電流値に対応する制御信号
ＩF Ｃを生成し、送信回路２に与える。送信回路２は例
えば増幅器から成り、制御信号ＩF Ｃに従い駆動電流の
電流値を変化させる。FIG. 2 shows a circuit configuration including a light emitting element 1, a light receiving element 3, a receiving circuit 4, and a transmitting circuit 2. Light emitting element 1
Is composed of, for example, a light-emitting LED, and an anode and a cathode are connected between an output terminal and a ground terminal of the transmission circuit 2. . The light receiving element 3 is connected to the receiving circuit 4, and when the light receiving element 3 receives light, a light receiving signal having a current value corresponding to the light amount is given to the receiving circuit 4.
The receiving circuit 4 is composed of a control element such as an amplifier, for example.
When a light receiving signal is given, a control signal IFC corresponding to this current value is generated and given to the transmitting circuit 2. The transmission circuit 2 includes, for example, an amplifier, and changes the current value of the drive current according to the control signal IFC.
【００１２】この回路は、光コネクタプラグ１０がレセ
プタクル５に嵌合されているときと嵌合されていないと
きとにおいて、それぞれ次のように動作する。光コネク
タプラグ１０が嵌合されているときは、発光素子１から
出射された光が矢印Ａのように光コネクタプラグ１０に
実装された光ファイバ７に入射する。さらに、光の一部
が矢印Ｂのように光コネクタプラグ１０における例えば
フェルール先端に反射して、受光素子３に受光される。
受光した光量に応じた受光信号が受光素子３から出力さ
れ、受信回路４に与えられる。受信回路４は、光信号の
伝送に必要な光強度が得られるように制御信号ＩF Ｃを
送信回路２に与えて制御する。送信回路２は、発光素子
１に駆動電流を与える。This circuit operates as follows when the optical connector plug 10 is fitted into the receptacle 5 and when it is not fitted. When the optical connector plug 10 is fitted, the light emitted from the light emitting element 1 enters the optical fiber 7 mounted on the optical connector plug 10 as shown by arrow A. Further, a part of the light is reflected on the tip of the ferrule in the optical connector plug 10 as shown by an arrow B, and is received by the light receiving element 3.
A light receiving signal corresponding to the amount of received light is output from the light receiving element 3 and provided to the receiving circuit 4. The reception circuit 4 controls the transmission circuit 2 by supplying a control signal IFC to the transmission circuit 2 so that the light intensity required for transmitting the optical signal is obtained. The transmission circuit 2 supplies a drive current to the light emitting element 1.
【００１３】光コネクタプラグ１０が嵌合されていない
ときは、発光素子１から出射された光は光ファイバ７に
入射されないだけでなく、光コネクタプラグ１０の先端
に反射されることもない。よって、受光素子３には発光
素子１からの光が殆ど受光されない。受光素子３から受
信回路４へ殆ど受光信号が出力されなくなり、受信回路
４は発光素子１の光強度が例えば上記安全基準を満たす
値以下になるように制御信号ＩF Ｃを送信回路２に与え
る。送信回路２はこの制御に基づき、発光素子１に与え
る駆動電流を低下させる。When the optical connector plug 10 is not fitted, the light emitted from the light emitting element 1 does not not only enter the optical fiber 7 but is not reflected on the tip of the optical connector plug 10. Therefore, the light from the light emitting element 1 is hardly received by the light receiving element 3. Almost no light receiving signal is output from the light receiving element 3 to the receiving circuit 4, and the receiving circuit 4 gives the control signal IFC to the transmitting circuit 2 so that the light intensity of the light emitting element 1 becomes, for example, a value satisfying the above safety standard. The transmission circuit 2 reduces the drive current applied to the light emitting element 1 based on this control.
【００１４】このように本実施の形態によれば、光コネ
クタプラグ１０がレセプタクル５に嵌合しているときは
発光素子１からの光の一部が受光素子３に受光され、受
信回路４及び送信回路２の制御によって、必要な光強度
が得られるような駆動電流が発光素子１に与えられる。
光コネクタプラグ１０がレセプタクル５に嵌合していな
いときは、発光素子１からの光が殆ど受光素子３に受光
されず、駆動電流が減少して発光素子１からの光強度は
安全基準以下まで低下する。これにより、発光素子１か
ら出射された光が人間の目に入ることで損傷を招く事態
が回避される。As described above, according to the present embodiment, when the optical connector plug 10 is fitted in the receptacle 5, a part of the light from the light emitting element 1 is received by the light receiving element 3, and the light receiving circuit 4 Under the control of the transmission circuit 2, a drive current that provides a required light intensity is given to the light emitting element 1.
When the optical connector plug 10 is not fitted in the receptacle 5, the light from the light emitting element 1 is hardly received by the light receiving element 3, the driving current is reduced, and the light intensity from the light emitting element 1 falls below the safety standard. descend. This avoids a situation where light emitted from the light emitting element 1 enters human eyes and causes damage.
【００１５】上述した実施の形態はー例であり、本発明
を限定するものではない。例えば上記実施の形態では、
図１に示されたように、受光素子３と受信回路４とが同
一の半導体チップ上に集積化されている。しかし、受光
素子３と受信回路４とが別々の素子として設けられてい
てもよい。あるいは、受光素子３及び受信回路４を送信
回路４と同一チップに集積化してもよい。さらに、上記
実施の形態では、発光素子１から出射した光を光コネク
タプラグ１０のフェルール先端に反射させて受光素子３
に受光させている。しかし、光コネクタプラグ１０の他
の部分に反射させて受光させるように構成してもよい。The above-described embodiment is an example and does not limit the present invention. For example, in the above embodiment,
As shown in FIG. 1, the light receiving element 3 and the receiving circuit 4 are integrated on the same semiconductor chip. However, the light receiving element 3 and the receiving circuit 4 may be provided as separate elements. Alternatively, the light receiving element 3 and the receiving circuit 4 may be integrated on the same chip as the transmitting circuit 4. Further, in the above embodiment, the light emitted from the light emitting element 1 is reflected by the ferrule tip of the optical connector plug 10 so that the light receiving element 3
To receive light. However, the optical connector plug 10 may be configured to be reflected and received by another portion.
【００１６】[0016]
【発明の効果】以上説明したように、本発明の光送信器
によれば、光コネクタプラグがレセプタクルに嵌合して
いるときは、レセプタクルの発光素子から発光した光の
一部が光コネクタプラグに反射してレセプタクルの受光
素子に受光され、受信回路及び送信回路によって必要は
光強度が得られるように発光素子の駆動が制御され、光
コネクタプラグが嵌合していないときは、発光素子から
の光が受光素子に殆ど受光されず発光素子の光強度が低
下するように制御されるので、光コネクタプラグが嵌合
していないときに人間の目に光が入って損傷を与えるこ
とが防止される。As described above, according to the optical transmitter of the present invention, when the optical connector plug is fitted into the receptacle, a part of the light emitted from the light emitting element of the receptacle is partially removed. The light is received by the light receiving element of the receptacle, and the driving of the light emitting element is controlled by the receiving circuit and the transmitting circuit so as to obtain the necessary light intensity. When the optical connector plug is not fitted, the light is emitted from the light emitting element. Light is hardly received by the light receiving element and the light intensity of the light emitting element is controlled so as to prevent light from entering the human eye and damaging it when the optical connector plug is not fitted. Is done.
【図１】本発明のー実施の形態による光送信器の構成を
示した縦断面図。FIG. 1 is a longitudinal sectional view showing a configuration of an optical transmitter according to an embodiment of the present invention.
【図２】同光送信器における回路構成を示した回路図。FIG. 2 is a circuit diagram showing a circuit configuration of the optical transmitter.
【図３】従来の光送信器の構成を示した縦断面図。FIG. 3 is a longitudinal sectional view showing a configuration of a conventional optical transmitter.
１ 発光素子 ２ 送信回路 ３ 受光素子 ４ 受信回路 ５ レセプタクル ７ 光ファイバ ８ パッケージ ９ 外部端子 １０ 光コネクタプラグ DESCRIPTION OF SYMBOLS 1 Light emitting element 2 Transmitting circuit 3 Light receiving element 4 Receiving circuit 5 Receptacle 7 Optical fiber 8 Package 9 External terminal 10 Optical connector plug
Claims (3)
る送信回路と、 光を受光すると、この光の光量に対応した受光信号を出
力する受光素子と、 前記受光信号を与えられ、前記光量が所定値よりも大き
いことを前記受光信号が示す場合は前記発光素子から所
望の光強度が得られ、前記光量が前記所定値以下である
ことを前記受光信号が示す場合は前記発光素子の光強度
が基準値以下になるように前記送信回路を制御する受信
回路と、 を実装したレセプタクルを備え、 前記レセプタクルに前記光コネクタプラグが嵌合してい
る間、前記発光素子が出力した光の一部が前記光コネク
タプラグに反射して前記受光素子に受光されることを特
徴とする光送信器。A light-emitting element for outputting light; a transmission circuit for supplying a drive current for driving the light-emitting element to the light-emitting element; and a light-receiving element for receiving a light and outputting a light-receiving signal corresponding to the amount of light. When the light receiving signal is given and the light receiving signal indicates that the light amount is larger than a predetermined value, a desired light intensity is obtained from the light emitting element, and the light amount is equal to or less than the predetermined value. A receiving circuit that controls the transmitting circuit so that the light intensity of the light emitting element is equal to or less than a reference value when the light receiving signal indicates, and a receptacle in which the optical connector plug is fitted into the receptacle. An optical transmitter, wherein a part of the light output by the light emitting element is reflected by the optical connector plug and received by the light receiving element.
前記発光素子に与える増幅器を含み、 前記受信回路は、前記受光信号を与えられ、前記駆動電
流が前記受光信号に対応するように前記増幅器を制御す
る制御素子を含むことを特徴とする請求項１記載の光送
信器。2. The transmitting circuit includes an amplifier that generates the driving current and supplies the driving current to the light emitting element. The receiving circuit receives the light receiving signal, and the driving current corresponds to the light receiving signal. The optical transmitter according to claim 1, further comprising a control element that controls the amplifier.
前記送信回路及び前記受光素子及び前記受信回路が同一
半導体チップ上に形成されていることを特徴とする請求
項１又は２記載の光送信器。3. An optical transmitter according to claim 1, wherein said light receiving element and said receiving circuit, or said transmitting circuit, said light receiving element and said receiving circuit are formed on the same semiconductor chip. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32697498A JP3657791B2 (en) | 1998-11-17 | 1998-11-17 | Optical transmitter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32697498A JP3657791B2 (en) | 1998-11-17 | 1998-11-17 | Optical transmitter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2000150952A true JP2000150952A (en) | 2000-05-30 |
| JP3657791B2 JP3657791B2 (en) | 2005-06-08 |
Family
ID=18193893
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP32697498A Expired - Lifetime JP3657791B2 (en) | 1998-11-17 | 1998-11-17 | Optical transmitter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3657791B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007214614A (en) * | 2006-02-07 | 2007-08-23 | Yazaki Corp | Optical communication system |
-
1998
- 1998-11-17 JP JP32697498A patent/JP3657791B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007214614A (en) * | 2006-02-07 | 2007-08-23 | Yazaki Corp | Optical communication system |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3657791B2 (en) | 2005-06-08 |
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