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
Application number
JP1427990U
Other languages
Japanese (ja)
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed filed Critical
Priority to JP1427990U priority Critical patent/JPH03105050U/ja
Publication of JPH03105050U publication Critical patent/JPH03105050U/ja
Pending legal-status Critical Current

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Landscapes

  • Dc Digital Transmission (AREA)
  • Optical Communication System (AREA)

Description

【図面の簡単な説明】[Brief explanation of drawings]

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)

【実用新案登録請求の範囲】[Scope of utility model registration request] デイジタル電気信号を入力して電気光変換を行
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.
JP1427990U 1990-02-16 1990-02-16 Pending JPH03105050U (en)

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)

* Cited by examiner, † Cited by third party
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

Cited By (2)

* Cited by examiner, † Cited by third party
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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