JPS57131033A - Monitor for optical fiber transmission system - Google Patents
Monitor for optical fiber transmission systemInfo
- Publication number
- JPS57131033A JPS57131033A JP1640581A JP1640581A JPS57131033A JP S57131033 A JPS57131033 A JP S57131033A JP 1640581 A JP1640581 A JP 1640581A JP 1640581 A JP1640581 A JP 1640581A JP S57131033 A JPS57131033 A JP S57131033A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- pulse width
- counter
- monitor
- output
- 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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
- G01M11/30—Testing of optical devices, constituted by fibre optics or optical waveguides
Landscapes
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Testing Of Optical Devices Or Fibers (AREA)
Abstract
PURPOSE:To monitor the entire system by detection of waveform distortion due to secular change of an amplifier and light emitting elements checking for variations in the pulse width of an output pulse train. CONSTITUTION:A monitor 4 is composed of a pulse width detection circuit 5 and a discriminator circuit 6. A latch circuit 52 receives outptut signals of a receiver 3 and at the rise, outputs a latch signal to an AND circuit 54, while pulses of a pulse generator circuit 51 are separately output to an up counter 55 and a down counter 56 through the AND circuit 54. The up counter circuit 55 counts the number of pulses being transmitted to detect the expansion range of variations in the pulse width while down counter circuit 56 detects the reduction range of variations in the pulse width. The results of each circuit are output to a discriminator circuit 6. At the fall of the output signals of the receiver 3, the discriminator circuit 6 receives the signals from the counter circuits 55 and 56 to determine whether they are in the allowable values set.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1640581A JPS57131033A (en) | 1981-02-06 | 1981-02-06 | Monitor for optical fiber transmission system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1640581A JPS57131033A (en) | 1981-02-06 | 1981-02-06 | Monitor for optical fiber transmission system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS57131033A true JPS57131033A (en) | 1982-08-13 |
Family
ID=11915327
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1640581A Pending JPS57131033A (en) | 1981-02-06 | 1981-02-06 | Monitor for optical fiber transmission system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57131033A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59122031A (en) * | 1982-12-28 | 1984-07-14 | Toshiba Corp | Optical transmission system |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5370851A (en) * | 1976-12-07 | 1978-06-23 | Fujitsu Ltd | Measuring method for optical transmission characteristics of fibers |
-
1981
- 1981-02-06 JP JP1640581A patent/JPS57131033A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5370851A (en) * | 1976-12-07 | 1978-06-23 | Fujitsu Ltd | Measuring method for optical transmission characteristics of fibers |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59122031A (en) * | 1982-12-28 | 1984-07-14 | Toshiba Corp | Optical transmission system |
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