JPS6381545U - - Google Patents
Info
- Publication number
- JPS6381545U JPS6381545U JP1986174735U JP17473586U JPS6381545U JP S6381545 U JPS6381545 U JP S6381545U JP 1986174735 U JP1986174735 U JP 1986174735U JP 17473586 U JP17473586 U JP 17473586U JP S6381545 U JPS6381545 U JP S6381545U
- Authority
- JP
- Japan
- Prior art keywords
- optical
- conversion element
- electrical
- electrical conversion
- signal
- 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
- 238000006243 chemical reaction Methods 0.000 claims description 6
- 230000003287 optical effect Effects 0.000 claims 3
- 230000005540 biological transmission Effects 0.000 claims 1
- 239000013307 optical fiber Substances 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 4
- 238000001514 detection method Methods 0.000 description 1
Description
第１図は本考案の実施例の構成を示すブロツク
図、第２図は本考案の実施例における平均受光パ
ワーＰｒとその時のＡＰＤの増倍率との相関図で
あり、同時に示した曲線Ａは各平均受光パワーに
おけるＳＮＲを最大とする最適増倍率を示す。第
３図は従来回路の構成を示すブロツク図、第４図
は第３図従来回路における平均受光パワーＰｒと
その時のＡＰＤの増倍率との相関図であり、同時
に示した曲線Ｂは各平均受光パワーにおけるＳＮ
Ｒを最大とする最適増倍率を示す。
１……アバランシエフオトダイオード（ＡＰＤ
）、２……前置増幅器、３……主増幅器、４……
出力端子、５……帯域通過波器、６……パイロ
ツト信号増幅器、７……ピーク値検出回路、８…
…誤差増幅器、９……基準電圧発生回路、１０…
…低域通過波器、１１……直流―直流変換回路
、１２……減衰器。
FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention, and FIG. 2 is a correlation diagram between the average received light power P r and the multiplication factor of the APD at that time in the embodiment of the present invention, and a curve A shown at the same time. indicates the optimum multiplication factor that maximizes the SNR at each average received light power. Figure 3 is a block diagram showing the configuration of the conventional circuit, and Figure 4 is a correlation diagram between the average received light power Pr and the APD multiplication factor at that time in the conventional circuit shown in Figure 3. SN in received light power
The optimal multiplication factor with maximum R is shown. 1...Avalanche photodiode (APD)
), 2... preamplifier, 3... main amplifier, 4...
Output terminal, 5...Bandpass wave generator, 6...Pilot signal amplifier, 7...Peak value detection circuit, 8...
...Error amplifier, 9...Reference voltage generation circuit, 10...
...Low-pass wave generator, 11...DC-DC conversion circuit, 12...Attenuator.
Claims (1)
信号に変換する光―電気変換素子と、該光‐電気
変換素子からの前記電気信号の中からパイロツト
信号を抽出し、該パイロツト信号の振幅が、前記
光―電気変換素子の平均受光パワーによらず、一
定となるように前記光―電気変換素子の増倍率を
前記パイロツト信号に基づいて制御する自動利得
制御回路とを有した光受信回路において、前記光
―電気変換素子と前記自動利得制御回路との間に
設けられ、前記電気信号の減衰量の切り換え可能
な減衰器と、前記平均受光パワーのレンジにより
前記減衰器の減衰量を切り換える手段とを有する
ことを特徴とする光受信回路。 An optical-to-electrical conversion element converts an optical signal output from an optical fiber transmission line into an electrical signal, and a pilot signal is extracted from the electrical signal from the optical-to-electrical conversion element, and the amplitude of the pilot signal is An optical receiving circuit comprising an automatic gain control circuit that controls the multiplication factor of the optical-to-electrical conversion element based on the pilot signal so that it is constant regardless of the average received light power of the optical-to-electrical conversion element, an attenuator provided between the optical-electrical conversion element and the automatic gain control circuit and capable of switching the amount of attenuation of the electrical signal; and means for switching the amount of attenuation of the attenuator depending on the range of the average received light power. An optical receiving circuit characterized by having:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1986174735U JPS6381545U (en) | 1986-11-15 | 1986-11-15 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1986174735U JPS6381545U (en) | 1986-11-15 | 1986-11-15 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6381545U true JPS6381545U (en) | 1988-05-28 |
Family
ID=31113401
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1986174735U Pending JPS6381545U (en) | 1986-11-15 | 1986-11-15 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6381545U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013026636A (en) * | 2011-07-14 | 2013-02-04 | Hochiki Corp | Optical receiver |
-
1986
- 1986-11-15 JP JP1986174735U patent/JPS6381545U/ja active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013026636A (en) * | 2011-07-14 | 2013-02-04 | Hochiki Corp | Optical receiver |
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