JPS577645A - Optical receiving circuit - Google Patents
Optical receiving circuitInfo
- Publication number
- JPS577645A JPS577645A JP8091480A JP8091480A JPS577645A JP S577645 A JPS577645 A JP S577645A JP 8091480 A JP8091480 A JP 8091480A JP 8091480 A JP8091480 A JP 8091480A JP S577645 A JPS577645 A JP S577645A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- variable gain
- amplifying circuit
- apd1
- gain
- 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.)
- Granted
Links
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
- H04B10/60—Receivers
- H04B10/66—Non-coherent receivers, e.g. using direct detection
- H04B10/69—Electrical arrangements in the receiver
- H04B10/693—Arrangements for optimizing the preamplifier in the receiver
- H04B10/6931—Automatic gain control of the preamplifier
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Light Receiving Elements (AREA)
- Optical Communication System (AREA)
Abstract
PURPOSE:To increase an input operation range even when the variable gain range of a variable gain amplifying circuit is decreased, by interposing and connecting a saturating and amplifying circuit between the input of the variable gain amplifying circuit and the output of a variable gain photodetector like an avalanche photodiode APD. CONSTITUTION:When the level of light incident to an APD1 from an optical signal input terminal 10 is below a value L1, a saturating and amplifying circuit 6 is set in a linear operation range, and the gain of a variable gain amplifying circuit 2 is maximized and unchanged; and a control circuit 3 varies the amplification factor of the APD1 corresponding to variation in incident light level to keep the output signal peak of a receiving circuit constant. Since the circuit 3 exercises control so that the APd1 does not decrease below a lower-limit amplification factor, a control circuit 4 controls the gain of the circuit 2 in the ranges of values L1 and L2, and the circuit 6 is in linear operation. In a range above the value L2, the circuit 6 is saturated to make its output amplitude constant regardless of the incident light level.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8091480A JPS577645A (en) | 1980-06-17 | 1980-06-17 | Optical receiving circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8091480A JPS577645A (en) | 1980-06-17 | 1980-06-17 | Optical receiving circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS577645A true JPS577645A (en) | 1982-01-14 |
| JPS6111016B2 JPS6111016B2 (en) | 1986-04-01 |
Family
ID=13731654
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8091480A Granted JPS577645A (en) | 1980-06-17 | 1980-06-17 | Optical receiving circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS577645A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03260411A (en) * | 1990-03-08 | 1991-11-20 | Goto Seibiyoushiyo:Kk | Washer for fixing electrical wire |
-
1980
- 1980-06-17 JP JP8091480A patent/JPS577645A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6111016B2 (en) | 1986-04-01 |
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