JPS5737941A - Optical output circuit - Google Patents
Optical output circuitInfo
- Publication number
- JPS5737941A JPS5737941A JP11123580A JP11123580A JPS5737941A JP S5737941 A JPS5737941 A JP S5737941A JP 11123580 A JP11123580 A JP 11123580A JP 11123580 A JP11123580 A JP 11123580A JP S5737941 A JPS5737941 A JP S5737941A
- Authority
- JP
- Japan
- Prior art keywords
- value
- level
- light emitting
- digital signal
- inputted
- 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
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/38—Synchronous or start-stop systems, e.g. for Baudot code
- H04L25/40—Transmitting circuits; Receiving circuits
- H04L25/49—Transmitting circuits; Receiving circuits using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems
- H04L25/4917—Transmitting circuits; Receiving circuits using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems using multilevel codes
Landscapes
- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Optical Communication System (AREA)
- Semiconductor Lasers (AREA)
- Led Devices (AREA)
Abstract
PURPOSE:To improve the S/N by identifying an electric n-value digital signal at each identifying circuit corresponding to n-value levels, and converting it into a binary digital signal with a light emitting element through shaping into binary pulse. CONSTITUTION:An electric multivalue digital signal inputted to a terminal 6 is identified at identification circuits T1-Tn-1 corresponding to each multilevel, and this output is inputted to pulse wave shape circuits P1-Pn-1 corresponded. The circuits P1-Pn-1 increase the level having larger numerical value as level of 1- value < level of 2-value < level of (n-1)-value, drives light emitting elements D1-Dn-1 corresponded, and converts them into optical signals with the specified level. The output of the light emitting elements is synthesized at a photosybthesis circuit and inputted to an optical fiber 8. Thus, the S/N is improved and the information amount of n/2 times can be transmitted.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP11123580A JPS5737941A (en) | 1980-08-13 | 1980-08-13 | Optical output circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP11123580A JPS5737941A (en) | 1980-08-13 | 1980-08-13 | Optical output circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5737941A true JPS5737941A (en) | 1982-03-02 |
Family
ID=14555986
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP11123580A Pending JPS5737941A (en) | 1980-08-13 | 1980-08-13 | Optical output circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5737941A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5394261A (en) * | 1990-09-25 | 1995-02-28 | Canon Kabushiki Kaisha | Optical communication system and transmitting apparatus for use therein |
JP2002333603A (en) * | 2001-05-08 | 2002-11-22 | Mitsubishi Electric Corp | Multi-level modulation device |
JP2009124342A (en) * | 2007-11-13 | 2009-06-04 | Nippon Telegr & Teleph Corp <Ntt> | Optical transmission system |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5448102A (en) * | 1977-09-05 | 1979-04-16 | Cselt Centro Studi Lab Telecom | Optical fiber multiilevel signal transmitter |
-
1980
- 1980-08-13 JP JP11123580A patent/JPS5737941A/en active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5448102A (en) * | 1977-09-05 | 1979-04-16 | Cselt Centro Studi Lab Telecom | Optical fiber multiilevel signal transmitter |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5394261A (en) * | 1990-09-25 | 1995-02-28 | Canon Kabushiki Kaisha | Optical communication system and transmitting apparatus for use therein |
JP2002333603A (en) * | 2001-05-08 | 2002-11-22 | Mitsubishi Electric Corp | Multi-level modulation device |
JP4744720B2 (en) * | 2001-05-08 | 2011-08-10 | 三菱電機株式会社 | Multilevel modulator |
JP2009124342A (en) * | 2007-11-13 | 2009-06-04 | Nippon Telegr & Teleph Corp <Ntt> | Optical transmission system |
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