JPH03105050U - - Google Patents
Info
- Publication number
- JPH03105050U JPH03105050U JP1427990U JP1427990U JPH03105050U JP H03105050 U JPH03105050 U JP H03105050U JP 1427990 U JP1427990 U JP 1427990U JP 1427990 U JP1427990 U JP 1427990U JP H03105050 U JPH03105050 U JP H03105050U
- Authority
- JP
- Japan
- Prior art keywords
- optical
- signal
- level
- electrical
- outputs
- 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 claims description 17
- 230000005540 biological transmission Effects 0.000 claims description 5
- 238000006243 chemical reaction Methods 0.000 claims description 5
- 238000001514 detection method Methods 0.000 claims description 3
- 230000007423 decrease Effects 0.000 claims 2
- 238000010586 diagram Methods 0.000 description 3
Landscapes
- Dc Digital Transmission (AREA)
- Optical Communication System (AREA)
Description
第１図は本考案の一実施例のブロツク図、第２
図は本実施例の条件別信号の説明図、第３図は従
来の光伝送装置のブロツク図、第４図は従来例の
条件別信号の説明図である。
１……電気／光変換部、２……光伝送路、３…
…光／電気変換部、４……入力端子、５……反転
回路、６……論理和回路、７……ＬＥＤ駆動回路
、８……ＬＥＤ、９…無信号検知回路、１０……
アラーム出力、１１……フオトダイオード、１２
……ＡＧＣ回路、１３……反転回路、１４……論
理積回路、１５……光無信号検出回路、１６……
出力端子、１７……アラーム出力、１８……論理
積回路。
Fig. 1 is a block diagram of an embodiment of the present invention;
FIG. 3 is a block diagram of a conventional optical transmission device, and FIG. 4 is an explanatory diagram of condition-specific signals of the conventional example. 1...Electrical/optical conversion section, 2...Optical transmission line, 3...
...Optical/electric conversion section, 4... Input terminal, 5... Inverting circuit, 6... OR circuit, 7... LED drive circuit, 8... LED, 9... No signal detection circuit, 10...
Alarm output, 11...Photodiode, 12
... AGC circuit, 13 ... Inversion circuit, 14 ... AND circuit, 15 ... Optical no-signal detection circuit, 16 ...
Output terminal, 17... Alarm output, 18... AND circuit.
Claims (1)
なつて光伝送路により伝送し、受信側で光電気変
換してデイジタル電気信号を出力する光伝送装置
において、前記入力デイジタル電気信号のＨレベ
ル、Ｌレベルに対応して光信号がアクテイブＬレ
ベル、Ｈレベルになるように光変調して変換し、
入力が無信号時には電気信号のアラームを出力す
るとともに光出力を常に出力する電気／光変換部
と、変調された光信号を入力して電気信号に変換
し、前記入力電気信号と同じ極性に直して電気信
号を出力し、前記光信号の入力レベル低下時には
光無信号検知回路により光レベル低下のアラーム
出力を出すとともに電気出力を無信号にする光／
電気変換部とを有することを特徴とする光伝送装
置。 In an optical transmission device that inputs a digital electrical signal, performs electro-optical conversion, transmits the converted signal through an optical transmission line, and outputs the digital electrical signal through opto-electrical conversion on the receiving side, the H level and L level of the input digital electrical signal are determined. Optically modulates and converts the optical signal to active L level and H level according to the level,
An electrical/optical converter that outputs an electrical signal alarm when there is no input signal and always outputs an optical output, and an electrical/optical converter that inputs a modulated optical signal, converts it into an electrical signal, and converts it to the same polarity as the input electrical signal. When the input level of the optical signal decreases, an optical no-signal detection circuit outputs an alarm for the decrease in the optical level, and at the same time outputs an electrical signal from the optical signal.
An optical transmission device comprising: an electrical conversion section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1427990U JPH03105050U (en) | 1990-02-16 | 1990-02-16 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1427990U JPH03105050U (en) | 1990-02-16 | 1990-02-16 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03105050U true JPH03105050U (en) | 1991-10-31 |
Family
ID=31517648
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1427990U Pending JPH03105050U (en) | 1990-02-16 | 1990-02-16 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03105050U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005176193A (en) * | 2003-12-15 | 2005-06-30 | Miharu Communications Co Ltd | Optical reception terminal for subscriber with input switching function of ftth system |
-
1990
- 1990-02-16 JP JP1427990U patent/JPH03105050U/ja active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005176193A (en) * | 2003-12-15 | 2005-06-30 | Miharu Communications Co Ltd | Optical reception terminal for subscriber with input switching function of ftth system |
| JP4564745B2 (en) * | 2003-12-15 | 2010-10-20 | ミハル通信株式会社 | ONU for subscribers with input switching function in FTTH system |
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