JPH1117618A - Optical communication equipment - Google Patents
Optical communication equipmentInfo
- Publication number
- JPH1117618A JPH1117618A JP9165559A JP16555997A JPH1117618A JP H1117618 A JPH1117618 A JP H1117618A JP 9165559 A JP9165559 A JP 9165559A JP 16555997 A JP16555997 A JP 16555997A JP H1117618 A JPH1117618 A JP H1117618A
- Authority
- JP
- Japan
- Prior art keywords
- level
- light
- optical
- transmission
- light 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
- Optical Communication System (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、ＵＴＭＳ（Ｕｎｉ
ｖｅｒｓａｌ Ｔｒａｆｆｉｃ Ｍａｎａｇｅｍｅｎｔ
Ｓｙｓｔｅｍ：新交通管理システム）などの光通信シ
ステムに用いる光通信装置に関するものである。The present invention relates to a UTMS (Uni).
versal Traffic Management
The present invention relates to an optical communication device used for an optical communication system such as a new traffic management system.
【０００２】[0002]
【従来の技術】例えば、特開平６−９６３８７公報の図
１に示されるような光通信装置が提案されている。送信
光は常にあらかじめ定められた同じ光パワーで出力して
いる。2. Description of the Related Art For example, an optical communication apparatus as shown in FIG. 1 of JP-A-6-96387 has been proposed. The transmitted light is always output with the same predetermined optical power.
【０００３】[0003]
【発明が解決しようとする課題】小型・低価格を要求さ
れる光通信端末装置においてはＬＥＤなどの光出力デバ
イスを小型にすることが要求される。ＬＥＤを小型・低
価格にするためには使用する半導体チップ数を低減する
必要があるが、あらかじめ定められた光パワーを得るた
めに必要な電流を流すとＬＥＤ１チップあたりの電流が
増加し、寿命などの信頼性が悪化するという問題があっ
た。In an optical communication terminal device which is required to be small and inexpensive, it is required to reduce the size of an optical output device such as an LED. To reduce the size and cost of LEDs, it is necessary to reduce the number of semiconductor chips to be used. There is a problem that reliability is deteriorated.
【０００４】本発明の目的は、前記した従来技術各々の
問題点を除去し、小型・安価な光通信装置を提供するこ
とにある。An object of the present invention is to provide a small and inexpensive optical communication apparatus which eliminates the above-mentioned problems of the prior art.
【０００５】[0005]
【課題を解決するための手段】上記した目的を達成する
ために本発明では、光受信時に受信光レベルを検出し、
レベルが大きいときは通信相手が近くに存在すると判断
して送信光レベルを小さくし、逆に検出した受信光レベ
ルが小さいときは通信相手が遠くに存在すると判断して
送信光レベルを大きくする。In order to achieve the above object, according to the present invention, at the time of receiving light, a received light level is detected,
When the level is high, it is determined that the communication partner is near, and the transmission light level is reduced. Conversely, when the detected reception light level is low, it is determined that the communication partner is far, and the transmission light level is increased.
【０００６】上記手段により、常に送信光レベルを大き
くする必要がなくなりＬＥＤに流れる電流を低減するこ
とが可能となり、寿命を長くし、信頼性を高くすること
ができる。According to the above means, it is not necessary to always increase the transmission light level, so that the current flowing through the LED can be reduced, and the life can be prolonged and the reliability can be increased.
【０００７】[0007]
【発明の実施の形態】以下、本発明の実施例を図を用い
て詳細に説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings.
【０００８】図１は、本発明による光通信装置の第１実
施例を示すブロック図である。１０は光受信部、１１は
受光部、１２は増幅部、１３は整形部、１４はレベル検
出部、２０は光送信部、２１は投光部、２２は光出力制
御部、２３は駆動部、３０は制御部である。FIG. 1 is a block diagram showing a first embodiment of the optical communication apparatus according to the present invention. 10 is an optical receiving unit, 11 is a light receiving unit, 12 is an amplifying unit, 13 is a shaping unit, 14 is a level detecting unit, 20 is an optical transmitting unit, 21 is a light emitting unit, 22 is a light output control unit, and 23 is a driving unit. , 30 are control units.
【０００９】受光部１１に入力された光は光−電気変換
され増幅部１２に入力され増幅される。増幅部１２の出
力は整形部１３でデジタルデータに波形整形され制御部
３０に出力される。The light input to the light receiving unit 11 is subjected to optical-electrical conversion, input to the amplifying unit 12, and amplified. The output of the amplifier 12 is shaped into digital data by the shaping unit 13 and output to the control unit 30.
【００１０】他方、増幅部１２から出力される信号はレ
ベル検出部１４に入力されレベル検出され、入力された
光レベルに応じた信号が制御部３０に出力される。On the other hand, the signal output from the amplifier 12 is input to the level detector 14 for level detection, and a signal corresponding to the input light level is output to the controller 30.
【００１１】制御部３０内では、レベル検出部１４によ
って検出された光入力レベルに応じて送信光レベルを決
定し、光出力制御部２２に対し決定した光レベルを出力
する制御信号を出力する。また、制御部３０では送信デ
ータを生成し駆動部２３に出力する。駆動部２３では光
出力制御部２２からの信号を基にした送信光レベルにな
るよう投光部２１から光出力を行う。The control section 30 determines a transmission light level in accordance with the light input level detected by the level detection section 14 and outputs a control signal for outputting the determined light level to the light output control section 22. Further, the control unit 30 generates transmission data and outputs it to the driving unit 23. The driving unit 23 outputs light from the light projecting unit 21 so as to have a transmission light level based on the signal from the light output control unit 22.
【００１２】受信光レベルに応じて最適な送信光レベル
を決定し、光出力することにより、効率的な光送信を実
現することができる。[0012] Efficient optical transmission can be realized by determining an optimal transmission light level according to the reception light level and outputting the light.
【００１３】例えば固定局と移動局があり、移動局が固
定局に接近しており移動局に本発明を適用した場合につ
いて説明する。For example, there will be described a case where there are a fixed station and a mobile station, and the mobile station is approaching the fixed station and the present invention is applied to the mobile station.
【００１４】図２は、本発明による光通信装置の第２実
施例を説明するための送信光レベル対受信光レベルのグ
ラフである。ブロック図は図１と同様である。FIG. 2 is a graph of a transmission light level versus a reception light level for explaining a second embodiment of the optical communication apparatus according to the present invention. The block diagram is similar to FIG.
【００１５】受信光レベルが小さいときは送信光レベル
を大きくし、逆に受信光レベルが大きいときは送信光レ
ベルを小さくしている。このため固定局が一定の光を出
力している場合、移動局では受信光レベルが小さいとき
は、固定局との距離が遠いと考え、逆に受信光レベルが
大きいときは、固定局との距離が近いと考えることによ
って、距離が遠い場合は送信光レベルを大きくし、距離
が近い場合は送信光レベルを小さくしてＬＥＤなどの投
光部のデバイスの温度上昇を低くして長寿命化を図るこ
とができる。When the reception light level is low, the transmission light level is increased, and when the reception light level is high, the transmission light level is decreased. For this reason, when the fixed station outputs a constant light, the mobile station considers that the distance to the fixed station is long when the received light level is low, and conversely, when the received light level is high, the mobile station By considering that the distance is short, the transmission light level is increased when the distance is long, and the transmission light level is reduced when the distance is short, thereby lowering the temperature rise of the light emitting device such as LED and extending the life. Can be achieved.
【００１６】図３は、本発明による光通信装置の第３実
施例を説明するための送信光レベル対受信光レベルのグ
ラフである。ブロック図は図１と同様である。FIG. 3 is a graph of a transmission light level versus a reception light level for explaining a third embodiment of the optical communication apparatus according to the present invention. The block diagram is similar to FIG.
【００１７】受信光レベルが非常に小さい場合、本実施
例の場合は０．７５ｕＷ／ｃｍ２以下を想定している
が、距離が遠いため送信光レベルを最大にしても移動局
からの光信号を固定局で受信できない場合が考えられ
る。このような場合、移動局から出力を行っても無駄と
なる可能性が高く、ＬＥＤなどの電子部品の寿命を無駄
に短くすることとなる。さらに半２重通信を行うような
システムにおいては、送信期間に受信することができな
いので無駄な送信を行わないことによってその期間も受
信することができ、受信データ量を増加させることがで
きる。When the received light level is extremely low, the present embodiment assumes that the light level is 0.75 uW / cm2 or less. However, since the distance is long, even if the transmitted light level is maximized, the optical signal from the mobile station is not transmitted. There may be cases where reception is not possible at the fixed station. In such a case, there is a high possibility that the output from the mobile station will be wasted, and the life of the electronic component such as the LED will be unnecessarily shortened. Further, in a system in which half-duplex communication is performed, reception cannot be performed during the transmission period, so that the useless transmission is not performed so that the reception can be performed during that period, and the amount of received data can be increased.
【００１８】図４は、本発明による光通信装置の第４実
施例を示すブロック図である。３１は受信データ処理
部、３２は誤り率計測部である。図１と同一符号のもの
は同一機能を有する。FIG. 4 is a block diagram showing a fourth preferred embodiment of the optical communication apparatus according to the present invention. Reference numeral 31 denotes a reception data processing unit, and 32 denotes an error rate measurement unit. 1 have the same functions as those in FIG.
【００１９】整形部１３でディジタルデータに波形整形
された信号は受信データ処理部３１に入力される。受信
データ処理部３１ではクロック再生および再生したクロ
ックに同期したデータの生成が行われる。受信データ処
理部３１で処理されたデータは誤り率計測部３２で誤り
率が計測される。The signal shaped into digital data by the shaping section 13 is input to the received data processing section 31. The received data processing unit 31 performs clock reproduction and data generation in synchronization with the reproduced clock. The error rate of the data processed by the reception data processing unit 31 is measured by the error rate measurement unit 32.
【００２０】図５は、本発明による光通信装置の第４実
施例を説明するための送信光レベル対受信光レベルのグ
ラフである。FIG. 5 is a graph of a transmission light level versus a reception light level for explaining a fourth embodiment of the optical communication apparatus according to the present invention.
【００２１】誤り率計測部３２で計測された誤り率が悪
いときは送信光レベルを大きくし、逆に誤り率が良いと
きは送信光レベルを小さくする。このため固定局が一定
の光を出力している場合、移動局では誤り率が悪いとき
は、固定局との距離が遠いと考え、逆に誤り率が良いと
きは、固定局との距離が近いと考えることによって、距
離が遠い場合は送信光レベルを大きくし、距離が近い場
合は送信光レベルを小さくしてＬＥＤなどの投光部のデ
バイスの温度上昇を低くして長寿命化を図ることができ
る。When the error rate measured by the error rate measuring section 32 is low, the transmission light level is increased, and when the error rate is high, the transmission light level is decreased. For this reason, when the fixed station outputs a constant light, when the error rate is low at the mobile station, it is considered that the distance to the fixed station is long. Conversely, when the error rate is good, the distance to the fixed station is small. By considering the distance to be short, the transmission light level is increased when the distance is long, and the transmission light level is decreased when the distance is short, thereby lowering the temperature rise of the device of the light emitting unit such as the LED to extend the life. be able to.
【００２２】[0022]
【発明の効果】本発明によれば、受信光レベルまたは誤
り率に応じて送信光レベルを適宜変化させることにより
出力を効率よくし、ＬＥＤなどのデバイスの長寿命化を
図ることができる。According to the present invention, the output can be made efficient by appropriately changing the transmission light level according to the reception light level or the error rate, and the life of the device such as an LED can be extended.
【図１】本発明の第１実施例のブロック図である。FIG. 1 is a block diagram of a first embodiment of the present invention.
【図２】本発明の第２実施例のグラフである。FIG. 2 is a graph of a second embodiment of the present invention.
【図３】本発明の第３実施例のグラフである。FIG. 3 is a graph of a third embodiment of the present invention.
【図４】本発明の第４実施例のブロック図である。FIG. 4 is a block diagram of a fourth embodiment of the present invention.
【図５】本発明の第４実施例のグラフである。FIG. 5 is a graph of a fourth embodiment of the present invention.
１０…光受信部、 １１…受光部、 １２…増幅部、 １３…整形部、 １４…レベル検出部、 ２０…光送信部、 ２１…投光部、 ２２…光出力制御部、 ２３…駆動部、 ３０…制御部、 ３１…受信データ処理部、 ３２…誤り率計測部。 DESCRIPTION OF SYMBOLS 10 ... Light receiving part, 11 ... Light receiving part, 12 ... Amplifying part, 13 ... Shaping part, 14 ... Level detecting part, 20 ... Light transmitting part, 21 ... Light emitting part, 22 ... Light output control part, 23 ... Drive part , 30 ... control unit, 31 ... received data processing unit, 32 ... error rate measurement unit
───────────────────────────────────────────────────── フロントページの続き (72)発明者 長嶋 敏夫 神奈川県横浜市戸塚区吉田町292番地株式 会社日立製作所マルチメディアシステム開 発本部内 (72)発明者 畑下 博 神奈川県横浜市戸塚区吉田町292番地株式 会社日立製作所マルチメディアシステム開 発本部内 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Toshio Nagashima 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture Inside the multimedia system development headquarters, Hitachi, Ltd. (72) Inventor Hiroshi Hatashita Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa No.292 Inside Hitachi Multimedia Systems Development Division
Claims (4)
した光を電気信号に変換し適宜増幅・波形整形して受信
データとして出力する光受信部と、送信データを入力と
し光に変換して出力する光送信部と、これら受信データ
および送信データを処理・生成する制御部とを有する光
通信システムにおいて、 光受信部内に受信光レベルを検出するレベル検出部を備
え、 光送信部内に送信光レベルを制御する光出力制御部を備
え、 前記レベル検出部からの信号に基づき、あらかじめ定め
られた光レベルを出力するように前記光出力制御部によ
って送信光レベルを制御する制御部を備えたことを特徴
とする光通信装置。An optical receiver for converting received light into an electric signal, amplifying and shaping the waveform as appropriate, and outputting the received data as input data, and converting the transmitted data into input light for transmitting and receiving information using light. An optical communication system having an optical transmitting unit for outputting and outputting the data, and a control unit for processing and generating the received data and the transmission data, comprising: a level detecting unit for detecting a received light level in the optical receiving unit; A light output control unit that controls a transmission light level; and a control unit that controls a transmission light level by the light output control unit so as to output a predetermined light level based on a signal from the level detection unit. An optical communication device, comprising:
大きいときに、送信光レベルを小さくする制御信号を光
出力制御部より出力し、 前記光受信部に入力される受信光レベルが小さいとき
に、送信光レベルを大きくする制御信号を光出力制御部
より出力する光出力の制御を行う請求項１に記載の光通
信装置。2. An optical output control unit outputs a control signal for reducing a transmission light level when a reception light level input to the optical reception unit is high, and the reception light level input to the optical reception unit is 2. The optical communication device according to claim 1, wherein when the signal is low, the optical output is controlled such that a control signal for increasing the transmission light level is output from the optical output control unit.
あらかじめ定めたレベルより小さいときに、 送信光レベルを小さくする制御信号を光出力制御部より
出力する、 もしくは光送信を行わない制御信号を光出力制御部より
出力する、 もしくは制御部から光送信部へ送信データを出力しな
い、 いづれかの方法で光送信を抑制する光出力の制御を行う
請求項１または２に記載の光通信装置。3. A control for outputting a control signal for reducing the transmission light level from an optical output control unit when the reception light level input to the optical reception unit is smaller than a predetermined level, or controlling not to perform optical transmission. The optical communication device according to claim 1, wherein the optical communication device controls the optical output to suppress the optical transmission by outputting the signal from the optical output control unit or not outputting the transmission data from the control unit to the optical transmission unit. .
に誤り率を計測する機能を有し、 該誤り率が悪いときは受信レベルが小さいときと同様
に、誤り率がよいときは受信レベルが大きいときと同様
に、誤り率があらかじめ定められた値より悪いときは光
レベルがあらかじめ定められたレベルより小さいときと
同様に送信光レベルを制御する請求項２または３に記載
の光通信装置。4. A function of measuring an error rate in the control unit in place of the level detection unit, wherein when the error rate is low, the reception level is low, and when the error rate is high, the reception level is low. 4. The optical communication apparatus according to claim 2, wherein, when the error rate is lower than a predetermined value, the transmission light level is controlled in the same manner as when the error level is lower than the predetermined level. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9165559A JPH1117618A (en) | 1997-06-23 | 1997-06-23 | Optical communication equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9165559A JPH1117618A (en) | 1997-06-23 | 1997-06-23 | Optical communication equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH1117618A true JPH1117618A (en) | 1999-01-22 |
Family
ID=15814670
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9165559A Pending JPH1117618A (en) | 1997-06-23 | 1997-06-23 | Optical communication equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH1117618A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6647212B1 (en) * | 1999-04-26 | 2003-11-11 | Sony Corporation | Optical transmitter receiver and method of optical transmission and reception |
| JP2011061782A (en) * | 2009-09-07 | 2011-03-24 | Micro-Star Internatl Co Ltd | Transmission module, and electronic system using the same |
| CN104753604A (en) * | 2013-12-27 | 2015-07-01 | 富士通株式会社 | Optical Communication System, Method For Controlling Optical Communication, And Optical Transmitter |
| CN109253849A (en) * | 2018-11-26 | 2019-01-22 | 西安钧诚精密制造有限公司 | A kind of multi-functional air-tightness detection device |
-
1997
- 1997-06-23 JP JP9165559A patent/JPH1117618A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6647212B1 (en) * | 1999-04-26 | 2003-11-11 | Sony Corporation | Optical transmitter receiver and method of optical transmission and reception |
| JP2011061782A (en) * | 2009-09-07 | 2011-03-24 | Micro-Star Internatl Co Ltd | Transmission module, and electronic system using the same |
| CN104753604A (en) * | 2013-12-27 | 2015-07-01 | 富士通株式会社 | Optical Communication System, Method For Controlling Optical Communication, And Optical Transmitter |
| CN109253849A (en) * | 2018-11-26 | 2019-01-22 | 西安钧诚精密制造有限公司 | A kind of multi-functional air-tightness detection device |
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