JPH048762B2 - - Google Patents
Info
- Publication number
- JPH048762B2 JPH048762B2 JP3574186A JP3574186A JPH048762B2 JP H048762 B2 JPH048762 B2 JP H048762B2 JP 3574186 A JP3574186 A JP 3574186A JP 3574186 A JP3574186 A JP 3574186A JP H048762 B2 JPH048762 B2 JP H048762B2
- Authority
- JP
- Japan
- Prior art keywords
- beam splitter
- polarizing beam
- light
- collimator
- led
- 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.)
- Expired
Links
- 230000003287 optical effect Effects 0.000 claims description 19
- 230000002457 bidirectional effect Effects 0.000 claims description 13
- 239000013307 optical fiber Substances 0.000 claims description 10
- 239000000853 adhesive Substances 0.000 claims description 2
- 230000001070 adhesive effect Effects 0.000 claims description 2
- 230000004907 flux Effects 0.000 claims description 2
- 239000003822 epoxy resin Substances 0.000 claims 1
- 229920000647 polyepoxide Polymers 0.000 claims 1
- 239000000835 fiber Substances 0.000 description 9
- 230000005540 biological transmission Effects 0.000 description 7
- 229920006332 epoxy adhesive Polymers 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
Landscapes
- Optical Couplings Of Light Guides (AREA)
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、送受信機能を持つ端末間を結ぶ光デ
ータウエイ、特に単心双方向光通信に用いられる
単心双方向用光デバイスに関するものである。[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to an optical dataway connecting terminals having transmitting and receiving functions, and particularly to a single-fiber bidirectional optical device used for single-fiber bidirectional optical communication. be.
本発明は、単心双方向用光デバイスにおいて、
LEDより出射した光を平行光とするLEDコリメ
ーターに偏光ビームスプリツターを筒状をした絞
りを具備することにより、ノイズ源となる光を低
減し、より長距離伝送の可能な光デバイスを実現
した。
The present invention provides a single-fiber bidirectional optical device including:
By equipping an LED collimator with a polarizing beam splitter and a cylindrical aperture that converts the light emitted from the LED into parallel light, light that becomes a noise source is reduced, creating an optical device that can transmit longer distances. did.
単心双方向光通信に用いられるデバイスとして
は、従来技術として本出願人が既に提案した第２
図に示すようなものがある。筐体１には穴径、真
直度などの精度の良い２本の貫通穴が互いに直交
してあいていて、２本の貫通穴の４つの開口部に
は、LEDコリメーター４、コリメーター２、受
光素子５、偏光ビームスプリツター６を保持した
偏光ビームスプリツター保持部材８が、それぞれ
挿入された構造となつている。次に、この光デバ
イスの動作を説明する。LEDコリメーター４よ
り出射した平行光は、偏光ビームスプリツター
６、コリメーター２を通過後、伝送用光フアイバ
ー３に入射する。また伝送用光フアイバー３を通
つて逆方向から進んできた光は偏光ビームスプリ
ツター６で反射し、受光素子５に入射する。この
光デバイスを伝送用光フアイバー３の両側に接続
することにより、一本の光フアイバーで同時に双
方向の通信が可能となるのである。このような通
信形態を以降、全二重単心双方向と呼ぶことにす
る。
As a device used for single-fiber bidirectional optical communication, the second device already proposed by the applicant as a prior art
There is something like the one shown in the figure. In the housing 1, two through holes with high accuracy in hole diameter and straightness are perpendicular to each other, and the four openings of the two through holes are equipped with an LED collimator 4 and a collimator 2. , a light receiving element 5, and a polarizing beam splitter holding member 8 holding a polarizing beam splitter 6 are each inserted. Next, the operation of this optical device will be explained. The parallel light emitted from the LED collimator 4 passes through the polarizing beam splitter 6 and the collimator 2, and then enters the transmission optical fiber 3. Further, the light traveling from the opposite direction through the transmission optical fiber 3 is reflected by the polarizing beam splitter 6 and enters the light receiving element 5. By connecting this optical device to both sides of the transmission optical fiber 3, two-way communication is possible at the same time using a single optical fiber. Hereinafter, such a communication form will be referred to as full-duplex single-core bidirectional.
全二重単心双方向を実現するためには、信号対
雑音比（SN比）がよくなければならないのは自
明の理である。信号とは、第２図において、伝送
用光フアイバー３を通つて受光素子５に入射する
光のことであり、雑音（ノイズ）とは、LEDコ
リメーター４から出射し、受光素子５に入射する
光のことである。このノイズを押さえるために、
LEDコリメーター４の構造は第３図に示すよう
な工夫がなされている。この構造についても、本
出願人が既に提案済みである。すなわち、LED
９からの発光光は、光学レンズ１０で集光された
のち、筒状をした合成樹脂製の第一の絞り１１
と、筒状をした金属製の第二の絞り１２を通過
後、スリーブ１３の円筒軸に対し大きな角度を持
つた光線は大部分除去される。しかしながら、尚
若干の角度を持つた光線は第４図に示すような軌
跡を描き、反射時の偏光面の回転によつて一部が
偏光ビームスプリツタで反射され、ノイズとな
る。第４図中、６は偏光ビームスプリツター、１
４はコリメーター中の光学レンズ、１６は光フア
イバー１５を心出しし保持したフエルールであ
る。第４図に示すように、光フアイバー１５以外
の部分に入射した光線は光フアイバー内を伝送せ
ず、反射してノイズとなるため、従来このような
ノイズのために全二重単心双方向光通信システム
の伝送距離をあまりのばせないという欠点があつ
た。
It is axiomatic that in order to achieve full-duplex single-fiber bidirectional operation, the signal-to-noise ratio (SN ratio) must be good. In FIG. 2, the signal is the light that enters the light receiving element 5 through the transmission optical fiber 3, and the noise is the light that comes out from the LED collimator 4 and enters the light receiving element 5. It's about light. In order to suppress this noise,
The structure of the LED collimator 4 is devised as shown in Fig. 3. This structure has also already been proposed by the applicant. That is, LED
The emitted light from 9 is condensed by an optical lens 10, and then passed through a first diaphragm 11 made of cylindrical synthetic resin.
After passing through the cylindrical metal second diaphragm 12, most of the light rays having a large angle with respect to the cylindrical axis of the sleeve 13 are removed. However, the light beam having a slight angle still draws a trajectory as shown in FIG. 4, and due to the rotation of the plane of polarization upon reflection, a part of the light beam is reflected by the polarizing beam splitter, resulting in noise. In Figure 4, 6 is a polarizing beam splitter, 1
4 is an optical lens in the collimator, and 16 is a ferrule that centers and holds the optical fiber 15. As shown in Fig. 4, the light beam incident on the part other than the optical fiber 15 is not transmitted through the optical fiber, but is reflected and becomes noise. The drawback was that the transmission distance of optical communication systems could not be extended very much.
そこで本発明においては、LEDコリメーター
の平行光が出射する端面に偏光ビームスプリツタ
ーが接着され、偏光ビームスプリツターのLED
コリメーターに接着された面と相対する面に、光
束を制限するための筒状をした絞りが接着された
構造とすることにより、ノイズとなる光を極力押
さえた。
Therefore, in the present invention, a polarizing beam splitter is bonded to the end face of the LED collimator from which parallel light is emitted, and the LED of the polarizing beam splitter is
By creating a structure in which a cylindrical diaphragm to limit the luminous flux is bonded to the surface opposite to the surface bonded to the collimator, light that becomes noise is suppressed as much as possible.
本発明の実施例を第１図及び第５図により説明
する。同じ名称には第２図または第４図と同じ番
号を付した。第１図において、第２図に示すよう
な偏光ビームスプリツター保持部材８はなく、
LEDコリメーター４の平行光が出射する端面に、
偏光ビームスプリツター６が接着により保持さ
れ、偏光ビームスプリツター６の反対側の面には
筒状の絞り７が接着されている。尚、当然のこと
ながら、LEDコリメーター４及び偏光ビームス
プリツター６及び筒状の絞り７は、治具等により
接着の際に軸出しがされている。
An embodiment of the present invention will be described with reference to FIGS. 1 and 5. The same names are given the same numbers as in FIG. 2 or 4. In FIG. 1, there is no polarizing beam splitter holding member 8 as shown in FIG.
At the end surface from which the parallel light of LED collimator 4 is emitted,
A polarizing beam splitter 6 is held by adhesive, and a cylindrical aperture 7 is adhered to the opposite surface of the polarizing beam splitter 6. Incidentally, as a matter of course, the axis of the LED collimator 4, the polarizing beam splitter 6, and the cylindrical diaphragm 7 is aligned using a jig or the like during bonding.
本発明の動作を第５図及び第６図により説明す
る。第５図において、光フアイバー１５より出射
した光は光学レンズ１４によつて平行光となり、
平行光は筒状の絞り７の穴を通過し、偏光ビーム
スプリツター６で反射し受光素子（図示せず）に
入射する。また第６図において、ノイズ源となる
光は上と下の矢印で示すように、偏光ビームスプ
リツター６から黒色エポキシ系接着剤１７に入
る。ここでの反射率は、偏光ビームスプリツター
６の屈折率を1.53黒色エポキシ系接着剤の屈折率
を1.75とすると、
（1.75−1.53）2／（1.75＋1.53）2≒0.0045
すなわち0.5％以下となり非常にわずかである。
残りの99.5％以上の光は黒色エポキシ系接着剤１
７に吸収され消滅する。すなわち、信号となる有
効な光のみ筒状の絞り７を通過し、ノイズ源とな
るほとんど100％が、コリメーター２に入射する
前にカツトされてしまうのである。その結果、
SN比が大きく向上し、より長距離のデータ伝送
が可能となるのである。 The operation of the present invention will be explained with reference to FIGS. 5 and 6. In FIG. 5, the light emitted from the optical fiber 15 becomes parallel light by the optical lens 14,
The parallel light passes through a hole in a cylindrical aperture 7, is reflected by a polarizing beam splitter 6, and enters a light receiving element (not shown). Further, in FIG. 6, light that becomes a noise source enters the black epoxy adhesive 17 from the polarizing beam splitter 6 as shown by the upper and lower arrows. The reflectance here is (1.75-1.53) 2 / (1.75 + 1.53) 2 ≒0.0045, that is, 0.5% or less, assuming that the refractive index of the polarizing beam splitter 6 is 1.53 and the refractive index of the black epoxy adhesive is 1.75. This is a very small amount.
The remaining 99.5% or more of the light is black epoxy adhesive 1
7 and disappears. In other words, only the effective signal light passes through the cylindrical diaphragm 7, and almost 100% of the noise source is cut off before it enters the collimator 2. the result,
This greatly improves the signal-to-noise ratio and enables data transmission over longer distances.
以上説明したように、本発明による単心双方向
用光デバイスを使用すれば、SN比が非常に大き
くとれるため、全二重単心双方向光システムの伝
送距離をのばせるという効果を有する。
As explained above, if the single-fiber bidirectional optical device according to the present invention is used, the signal-to-noise ratio can be very high, so it has the effect of extending the transmission distance of a full-duplex single-fiber bidirectional optical system.
第１図は本発明による単心双方向光デバイスの
実施例の断面図、第２図は従来の単心双方向光デ
バイスの断面図、第３図はLEDコリメーターの
一例の断面図、第４図は従来例の問題点を説明す
る図、第５図及び第６図は本発明の動作を説明す
る断面図である。
１……筐体、２……コリメーター、４……
LEDコリメーター、５……受光素子、６……偏
光ビームスプリツター、７……筒状の絞り、１７
……黒色エポキシ系接着剤。
FIG. 1 is a sectional view of an embodiment of a single-fiber bidirectional optical device according to the present invention, FIG. 2 is a sectional view of a conventional single-fiber bidirectional optical device, and FIG. 3 is a sectional view of an example of an LED collimator. FIG. 4 is a diagram for explaining the problems of the conventional example, and FIGS. 5 and 6 are sectional views for explaining the operation of the present invention. 1... Housing, 2... Collimator, 4...
LED collimator, 5... Light receiving element, 6... Polarizing beam splitter, 7... Cylindrical aperture, 17
...Black epoxy adhesive.
Claims (1)
と、外径が該筐体の一方の貫通穴の片方の開口部
に精密嵌合し、光フアイバーからの出射光を平行
光に変換するコリメーターと、 LEDを具備し、外径が前記筐体の前記貫通穴
の他方の開口部に精密嵌合するLEDコリメータ
ーと、 偏光ビームスプリツターと、 前記筐体の他方の貫通穴のどちらか一方の開口
部に挿入される受光素子よりなる単心双方向用光
デバイスにおいて、 LEDコリメーターの平行光が出射する端面に
偏光ビームスプリツターが接着され、 偏光ビームスプリツターのLEDコリメーター
に接着された面と相対する面に、光束を制限する
ための筒状をした絞りが接着されたことを特徴と
する単心双方向用光デバイス。 ２ 前記偏光ビームスプリツターと前記絞りを接
着するための接着材は、黒色エポキシ系樹脂であ
ることを特徴とする特許請求の範囲第１項記載の
単心双方向用光デバイス。[Scope of Claims] 1. A housing having two through-holes orthogonal to each other, the outer diameter of which is precisely fitted into one opening of one of the through-holes of the housing, and parallelizing light emitted from an optical fiber. a collimator that converts into light; an LED collimator that includes an LED and has an outer diameter that precisely fits into the other opening of the through hole of the housing; a polarizing beam splitter; In a single-core bidirectional optical device consisting of a light receiving element inserted into either opening of a through hole, a polarizing beam splitter is glued to the end face of the LED collimator from which parallel light is emitted, and the polarizing beam splitter is A single-core bidirectional optical device characterized by having a cylindrical diaphragm bonded to the surface opposite to the surface bonded to the LED collimator to limit the luminous flux. 2. The single-core bidirectional optical device according to claim 1, wherein the adhesive for bonding the polarizing beam splitter and the aperture is a black epoxy resin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3574186A JPS62194207A (en) | 1986-02-20 | 1986-02-20 | Single-core two-way optical device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3574186A JPS62194207A (en) | 1986-02-20 | 1986-02-20 | Single-core two-way optical device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62194207A JPS62194207A (en) | 1987-08-26 |
| JPH048762B2 true JPH048762B2 (en) | 1992-02-18 |
Family
ID=12450250
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3574186A Granted JPS62194207A (en) | 1986-02-20 | 1986-02-20 | Single-core two-way optical device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62194207A (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01270009A (en) * | 1988-04-22 | 1989-10-27 | Furukawa Electric Co Ltd:The | Optical coupling device |
| JPH01164564U (en) * | 1988-05-02 | 1989-11-16 | ||
| JP2555162B2 (en) * | 1988-08-30 | 1996-11-20 | アンリツ株式会社 | Optical component optical axis fixing method |
| JPH0511111U (en) * | 1991-07-29 | 1993-02-12 | セイコー電子工業株式会社 | Optical device for single-core two-way communication |
| JP3662162B2 (en) * | 2000-03-03 | 2005-06-22 | シャープ株式会社 | Bi-directional optical communication module |
-
1986
- 1986-02-20 JP JP3574186A patent/JPS62194207A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62194207A (en) | 1987-08-26 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| S533 | Written request for registration of change of name |
Free format text: JAPANESE INTERMEDIATE CODE: R313533 |
|
| R350 | Written notification of registration of transfer |
Free format text: JAPANESE INTERMEDIATE CODE: R350 |
|
| LAPS | Cancellation because of no payment of annual fees |