JPH01101035A - System for bidirectional optical communications - Google Patents
System for bidirectional optical communicationsInfo
- Publication number
- JPH01101035A JPH01101035A JP62257177A JP25717787A JPH01101035A JP H01101035 A JPH01101035 A JP H01101035A JP 62257177 A JP62257177 A JP 62257177A JP 25717787 A JP25717787 A JP 25717787A JP H01101035 A JPH01101035 A JP H01101035A
- Authority
- JP
- Japan
- Prior art keywords
- optical
- transmitter
- receiver
- optical output
- distance
- 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
- 230000003287 optical effect Effects 0.000 title claims abstract description 42
- 238000004891 communication Methods 0.000 title claims abstract description 9
- 230000002457 bidirectional effect Effects 0.000 title abstract description 6
- 238000012544 monitoring process Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
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
- H04B10/25—Arrangements specific to fibre transmission
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は２双方向光通信方式に係り、特に送受信器間の
距離が短かい場合に好適な、光送信器の光出力制御方式
に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a two-way optical communication system, and particularly to an optical output control system for an optical transmitter that is suitable when the distance between the transmitter and receiver is short.
従来の装置は１両端末の距離が短い時には、光減衰器を
用いて、受光レベルを減衰させていた。Conventional devices use an optical attenuator to attenuate the level of received light when the distance between two terminals is short.
（発明が解決しようと、する問題点） 上記従来技術は、送信器間の距離が短かい場合。(The problem that the invention attempts to solve) In the above conventional technology, the distance between the transmitters is short.
に光受信器が過負荷するという問題があり、それ−を解
決するためには、光固定減衰器を使用；−なければなら
ないという問題があった。There is a problem that the optical receiver is overloaded, and in order to solve this problem, a fixed optical attenuator must be used.
本発明の目的は、逆受信器間の距離が非常に短かい場合
に自動的に光出力を低くして、受信器の過負荷を防止す
る仁とにある。SUMMARY OF THE INVENTION An object of the present invention is to automatically reduce the optical output when the distance between opposite receivers is very short, thereby preventing overloading of the receivers.
上記目的は、双方向光通信方式の場合、逆方向の受光電
力をモニタし、この値によって送信器の光出力を制御す
る事により達成される。In the case of a bidirectional optical communication system, the above object is achieved by monitoring the received light power in the opposite direction and controlling the optical output of the transmitter based on this value.
（作用〕
光送信器け、逆方向の受光電力の平均値を検出して１発
光素子の駆動電流を制御するように動作する。それによ
って、送受信器間の距離が短かい場合には、光送信器の
光出力を下げ、距離が長い場合には、光送信器の光出力
を上げるよう１７ｃなるので、光固定減衰器等を用いな
くても、自動的（受信器の過負荷を防ぐことができる。(Function) The optical transmitter detects the average value of the received light power in the opposite direction and operates to control the drive current of one light emitting element.As a result, when the distance between the transmitter and receiver is short, the optical 17C lowers the optical output of the transmitter and increases the optical output of the optical transmitter when the distance is long, so there is no need to use a fixed optical attenuator, etc., automatically (to prevent overloading of the receiver). Can be done.
（実施例）
以下２本発明の一実施例を第１図、第２図てより説明す
る。(Embodiment) Two embodiments of the present invention will be described below with reference to FIGS. 1 and 2.
第１図は、双方向光通信方式のブロック図である。Ａ側
の光送信器（Ｏ８）の光出力を、Ｂ側のＯ８の光信号を
Ａ側のＯＲで受信する。この時、Ａ側のＯＲの平均受光
電力を検出し、この値によりＡ側のＯ８の光出力を制御
する。FIG. 1 is a block diagram of a bidirectional optical communication system. The optical output of the optical transmitter (O8) on the A side and the optical signal of the O8 on the B side are received by the OR on the A side. At this time, the average received light power of the A-side OR is detected, and the optical output of the A-side O8 is controlled based on this value.
第２図は、本制御方式の具体的回路を示す。FIG. 2 shows a specific circuit of this control method.
ＯＲの４（ＡＰＤ）より受光光パワー（Ｃ比例した電圧
からより、０８のＡＰＣループ内の基準電圧２に加わり
、ＬＤの駆動回路１を制御する。A voltage proportional to the received light power (C) from OR 4 (APD) is added to the reference voltage 2 in the APC loop 08 to control the LD drive circuit 1.
本実施例によれば、双方向光通信方式の場合。According to this embodiment, in the case of a bidirectional optical communication system.
送受信器間の距離が短かい場合でも、光送信器の光出力
を自動的に下げて、受信器の過負荷を防ぐ効果があろう
〔発明の効果〕
本発明によれば、双方向光通信方式において。Even if the distance between the transmitter and receiver is short, the optical output of the optical transmitter will be automatically lowered to prevent overload of the receiver. [Effects of the Invention] According to the present invention, two-way optical communication In the method.
送受信器間の距離が短かい場合でも、固定減衰器等を用
いる事なく、自動的に光出力を下デて、受信器の過負荷
を防ぐ効果がある。Even when the distance between the transmitter and receiver is short, the optical output is automatically reduced without using a fixed attenuator, thereby preventing overload of the receiver.
第１図は１本発明の一実施例のブロック図、第２図は同
じく回路図である。
１・・・ＬＤ駆動回路、 ２・・・基準比較器
、３・・・平均値検出器、 ４・・・ＡＰＤ０
代理人弁理士 小 川 １１３ ％・“′（FIG. 1 is a block diagram of an embodiment of the present invention, and FIG. 2 is a circuit diagram of the same. 1... LD drive circuit, 2... Reference comparator, 3... Average value detector, 4... APD0
Representative Patent Attorney Ogawa 113%・“′(
Claims (1)
ニタし、これにより送信器の光出力を制御することを特
徴とする双方向光通信方式。1. A two-way optical communication system, which monitors the optical power in the opposite direction and controls the optical output of the transmitter accordingly.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62257177A JPH01101035A (en) | 1987-10-14 | 1987-10-14 | System for bidirectional optical communications |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62257177A JPH01101035A (en) | 1987-10-14 | 1987-10-14 | System for bidirectional optical communications |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01101035A true JPH01101035A (en) | 1989-04-19 |
Family
ID=17302752
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62257177A Pending JPH01101035A (en) | 1987-10-14 | 1987-10-14 | System for bidirectional optical communications |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01101035A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0845882A3 (en) * | 1996-11-28 | 1999-05-19 | Nec Corporation | A passive optical network transceiver circuit |
| EP0820162A3 (en) * | 1996-07-19 | 2000-10-11 | Sony Corporation | Optical signal communication apparatus and optical signal communication method |
| EP1895698A2 (en) * | 2006-08-28 | 2008-03-05 | Nec Corporation | Station-side optical network terminal apparatus, subscriber-side optical network terminal apparatus and optical communication system |
-
1987
- 1987-10-14 JP JP62257177A patent/JPH01101035A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0820162A3 (en) * | 1996-07-19 | 2000-10-11 | Sony Corporation | Optical signal communication apparatus and optical signal communication method |
| EP0845882A3 (en) * | 1996-11-28 | 1999-05-19 | Nec Corporation | A passive optical network transceiver circuit |
| EP1895698A2 (en) * | 2006-08-28 | 2008-03-05 | Nec Corporation | Station-side optical network terminal apparatus, subscriber-side optical network terminal apparatus and optical communication system |
| EP1895698A3 (en) * | 2006-08-28 | 2013-04-10 | NEC Corporation | Station-side optical network terminal apparatus, subscriber-side optical network terminal apparatus and optical communication system |
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