JPH01137838A - Optical transmission system for led with narrow spectrum - Google Patents
Optical transmission system for led with narrow spectrumInfo
- Publication number
- JPH01137838A JPH01137838A JP62298298A JP29829887A JPH01137838A JP H01137838 A JPH01137838 A JP H01137838A JP 62298298 A JP62298298 A JP 62298298A JP 29829887 A JP29829887 A JP 29829887A JP H01137838 A JPH01137838 A JP H01137838A
- Authority
- JP
- Japan
- Prior art keywords
- optical
- optical fiber
- led
- signal
- wavelength
- 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
- 230000003287 optical effect Effects 0.000 title claims abstract description 48
- 230000005540 biological transmission Effects 0.000 title claims abstract description 18
- 238000001228 spectrum Methods 0.000 title claims abstract description 13
- 239000013307 optical fiber Substances 0.000 claims abstract description 27
- 239000006185 dispersion Substances 0.000 abstract description 4
- 230000006866 deterioration Effects 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000000295 emission spectrum Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は光ファイバを用いた光伝送方式に関し、特に発
光素子としてＬＥＤ （発光ダイオード）を用いた光伝
送方式に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an optical transmission system using an optical fiber, and particularly to an optical transmission system using an LED (light emitting diode) as a light emitting element.
従来、この種のＬＥＤ光伝送方式は、第２図に示すよう
に通信用ＬＥＤ１と、光ファイバ３と、アバランシェフ
ォトダイオード（以下ＡＰＤと略す）４とからなるもの
であった。そして入力電気信号５は通信用ＬＥＤ１にお
いて光出力信号７となり、そのまま光ファイバ３を経由
して光フアイバ出力光信号１０となって、ＡＰＤ４によ
って出力電気信号６に変換されるものであった。Conventionally, this type of LED optical transmission system has been comprised of a communication LED 1, an optical fiber 3, and an avalanche photodiode (hereinafter abbreviated as APD) 4, as shown in FIG. The input electrical signal 5 becomes an optical output signal 7 in the communication LED 1, passes through the optical fiber 3 as it is, becomes an optical fiber output optical signal 10, and is converted into an output electrical signal 6 by the APD 4.
しかしながら、通信用ＬＥＤ１の光出力信号７は第３図
に示す広いスペクトラムを有するまま光ファイバ３に入
力されるため、光ファイバ３伝送時ファイバの波長分散
の効果により波長により伝送速度が変り、光波形が大き
く劣化し、伝送距離が制限されるという欠点があった。However, since the optical output signal 7 of the communication LED 1 is input to the optical fiber 3 while having a wide spectrum as shown in FIG. The drawbacks were that the waveform deteriorated significantly and the transmission distance was limited.
本発明の目的は上記の欠点すなわち、光フアイバ伝送時
に光信号の波形が劣化し、伝送距離が制限されるという
問題点を解決した狭スペクトルＬＥＤ光伝送方式を提供
することにある。SUMMARY OF THE INVENTION An object of the present invention is to provide a narrow-spectrum LED optical transmission system that solves the above-mentioned drawbacks, namely, that the waveform of an optical signal deteriorates during optical fiber transmission and the transmission distance is limited.
本発明は上記の問題点２脣解決するために、通信い；；
、′、ｓ）
用ＬＥＤと、このＬＥＤの発光波長の一部を通過させる
光フィルタと、光ファイバと、フォトダイオードからな
る構成を採用するものである。The present invention aims to solve two of the above problems by communicating;
, ', s), an optical filter that allows a part of the emission wavelength of the LED to pass through, an optical fiber, and a photodiode.
本発明は上述のように構成したので、通信用ＬＥＤから
の広い幅のスペクトルが光フィルタを通過して波長帯域
の狭いスペクトルの光信号となり、光フアイバ伝送時の
波長分散が軽減される。Since the present invention is configured as described above, the wide spectrum from the communication LED passes through the optical filter and becomes an optical signal with a narrow spectrum in the wavelength band, thereby reducing chromatic dispersion during optical fiber transmission.
次に、本発明の実施例について図面を参照して説明する
。Next, embodiments of the present invention will be described with reference to the drawings.
本発明の一実施例を構成図で示す第１図を参照すると、
本発明の狭スペクトルＬＥＤ光伝送方式は通信用ＬＥＤ
ｌと、ＬＥＤの発光スペクトルの一部を通過させる光フ
ィルタ２と、光ファイバ３と、ＡＰＤ４とを有し、５は
入力電気信号、６は出力電気信号、７はＬＥＤの光出力
信号、８は光フィルタを通過した光信号、９は光フアイ
バ伝送後の光信号である。また、第３図はＬＥＤ光出カ
フの波長（スペクトル）１−強度特性例であり、第４図
は光フィルタ２の波長−通過損失特性例である。第５図
は、光フィルタ２を通過した光信号８の波長−強度特性
例である。Referring to FIG. 1, which shows a configuration diagram of an embodiment of the present invention,
The narrow spectrum LED optical transmission system of the present invention is a communication LED.
1, an optical filter 2 that passes a part of the emission spectrum of the LED, an optical fiber 3, and an APD 4, 5 is an input electrical signal, 6 is an output electrical signal, 7 is an optical output signal of the LED, and 8 9 is an optical signal that has passed through an optical filter, and 9 is an optical signal that has been transmitted through an optical fiber. Further, FIG. 3 is an example of the wavelength (spectrum) 1-intensity characteristic of the LED light output cuff, and FIG. 4 is an example of the wavelength-passage loss characteristic of the optical filter 2. FIG. 5 is an example of wavelength-intensity characteristics of the optical signal 8 that has passed through the optical filter 2. In FIG.
次に本実施例の動作について第１図〜第５図を用いて説
明する。Next, the operation of this embodiment will be explained using FIGS. 1 to 5.
第１図において、通信用ＬＥＤ１からの光出力信号７は
第３図のように波長の分布が広いものであり、光ファイ
バ２を通過することによって第５図に示すような狭帯域
スペクトルの光フアイバ出力光信号８が得られる。した
がって、この光信号８は光ファイバ３伝送時に光ファイ
バ３の波長分散による光波形の劣化が軽減され、光信号
９として良好な波形が得られる。したがって、従来例の
光信号７にくらべ長距離の光フアイバ伝送が可能である
。なお、受光素子４としてはＡＰＤだけでなく、ビンフ
ォトダイオードＰＩＮ−ＰＤを用いても同様の結果が得
られる。In FIG. 1, the optical output signal 7 from the communication LED 1 has a wide wavelength distribution as shown in FIG. A fiber output optical signal 8 is obtained. Therefore, when the optical signal 8 is transmitted through the optical fiber 3, deterioration of the optical waveform due to wavelength dispersion of the optical fiber 3 is reduced, and a good waveform can be obtained as the optical signal 9. Therefore, compared to the conventional optical signal 7, longer distance optical fiber transmission is possible. Note that similar results can be obtained by using not only an APD but also a bin photodiode PIN-PD as the light receiving element 4.
以上に説明したように、本発明によれば、ＬＥＤの発光
波長の一部を通過させる光フィルタを設げることにより
、光ファイバに入力する光信号のスペクトル幅を狭め、
光フアイバ伝送時の波長分散による劣化を軽減し、従来
の構成にくらべ長距離の光フアイバ伝送ができるという
効果がある。As explained above, according to the present invention, by providing an optical filter that passes a part of the emission wavelength of the LED, the spectral width of the optical signal input to the optical fiber is narrowed,
This has the effect of reducing deterioration due to wavelength dispersion during optical fiber transmission and allowing longer distance optical fiber transmission compared to conventional configurations.
第１図は本発明の一実施例のブロック構成図、第２図は
従来の構成図、第３図はＬＥＤ光出力の波長（スペクト
ル）−強度特性例、第４図は光フィルタの波長（スペク
トル）−通過損失特性例、第５図は第３図に示すＬＥＤ
光出力を第４図に示す光フィルタを通過させたときの光
信号のスペクトル特性である。
１・・・・・・通信用ＬＥＤ、２・・・・・・光フィル
タ、３・・・・・・光ファイバ、４・・・・・・ＡＰＤ
（アバランシェフォトダイオード）、訃・・・・・入
力電気信号、６・・・・・・出力電気信号、７・・・・
・・ＬＥＩ）光出力信号、８・・・・・・光フイルタ出
力光信号、９・・・・・・光フアイバ出力光信号。
代理人 弁理士 内 原 音Fig. 1 is a block configuration diagram of an embodiment of the present invention, Fig. 2 is a conventional configuration diagram, Fig. 3 is an example of wavelength (spectrum)-intensity characteristics of LED light output, and Fig. 4 is a wavelength (spectrum)-intensity characteristic example of an optical filter. Spectrum) - Passage loss characteristic example, Figure 5 shows the LED shown in Figure 3.
This is a spectrum characteristic of an optical signal when the optical output is passed through the optical filter shown in FIG. 1... Communication LED, 2... Optical filter, 3... Optical fiber, 4... APD
(Avalanche photodiode), 2... Input electrical signal, 6... Output electrical signal, 7...
... LEI) optical output signal, 8 ... optical filter output optical signal, 9 ... optical fiber output optical signal. Agent Patent Attorney Oto Uchihara
Claims (1)
使用する光伝送方式において、前記通信用ＬＥＤと光フ
ァイバとの間に前記通信用ＬＥＤの発光波長の一部を通
過せされる光フィルタを設けることを特徴とする狭スペ
クトルＬＥＤ光伝送方式。In an optical transmission system using a communication LED, an optical fiber, and a photodiode, an optical filter is provided between the communication LED and the optical fiber to allow a part of the emission wavelength of the communication LED to pass through. A narrow spectrum LED optical transmission system characterized by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62298298A JPH01137838A (en) | 1987-11-25 | 1987-11-25 | Optical transmission system for led with narrow spectrum |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62298298A JPH01137838A (en) | 1987-11-25 | 1987-11-25 | Optical transmission system for led with narrow spectrum |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01137838A true JPH01137838A (en) | 1989-05-30 |
Family
ID=17857834
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62298298A Pending JPH01137838A (en) | 1987-11-25 | 1987-11-25 | Optical transmission system for led with narrow spectrum |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01137838A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6740807B2 (en) | 2000-09-27 | 2004-05-25 | Fuji Photo Film Co., Ltd. | Light-receiving device and image sensor |
-
1987
- 1987-11-25 JP JP62298298A patent/JPH01137838A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6740807B2 (en) | 2000-09-27 | 2004-05-25 | Fuji Photo Film Co., Ltd. | Light-receiving device and image sensor |
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