JP2005295018A - Information communication method by interference control, and its apparatus - Google Patents

Information communication method by interference control, and its apparatus Download PDF

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JP2005295018A
JP2005295018A JP2004104330A JP2004104330A JP2005295018A JP 2005295018 A JP2005295018 A JP 2005295018A JP 2004104330 A JP2004104330 A JP 2004104330A JP 2004104330 A JP2004104330 A JP 2004104330A JP 2005295018 A JP2005295018 A JP 2005295018A
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light beam
light
optical switch
optical
delay line
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Masanori Sato
正典 佐藤
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Honda Electronics Co Ltd
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Honda Electronics Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem in the conventional information communication that one can listen in by taking a light beam out of an optical fiber in principle, even if the light beam passing over the optical fiber is encrypted. <P>SOLUTION: A first beam splitter splits a light beam emitted from a light source into two beams, an optical switch is mounted on one light beam, a signal for controlling the optical switch is a transmission signal, the other light bema passes through a delay line, a second beam splitter combines the split one light beam with the other light beam, a transmitter transmits the result, a second beam splitter in a receiver separates the combined and transmitted light beam, a second optical switch samples one light beam, a third optical switch samples the other light beam which is then passes through a delay line, a fourth beam splitter makes the one light interfere with the other light beam, a first and second detectors detect their respective interferes, a receiver unit operates with the detected signals to transmit/receive information, thus constituting an information communication method and its apparatus by the interference control. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、盗聴が不可能な干渉制御による情報通信方法及びその装置に係り、特に、光の干渉をコントロールし、このコントロール信号を送信信号とするようにした干渉制御による情報通信方法及びその装置に関するものである。   The present invention relates to an information communication method and apparatus using interference control that cannot be wiretapped, and more particularly to an information communication method and apparatus using interference control in which optical interference is controlled and this control signal is used as a transmission signal. It is about.

従来、情報通信システムとしては、光ファイバーを通して、光ビームを変調するようにした光変調通信が提案されている。   Conventionally, as an information communication system, there has been proposed light modulation communication in which a light beam is modulated through an optical fiber.

しかしながら、従来のこのような情報通信では、光ファイバーから光ビームを取り出すことにより、原理的に盗聴することができ、又、光ファイバーを通過する光ビームを暗号化しても、盗聴を防ぐことができないという問題があった。そこで、盗聴を防ぐために、干渉を制御する発明を提案したが、この発明では、２経路が必要であった。
特願２００３−４０９８７９ However, in such conventional information communication, it is possible to eavesdrop in principle by taking out the light beam from the optical fiber, and it is impossible to prevent eavesdropping even if the light beam passing through the optical fiber is encrypted. There was a problem. Therefore, in order to prevent eavesdropping, an invention for controlling interference has been proposed, but in this invention, two routes are required.
Japanese Patent Application No. 2003-409879

解決しようとする問題点は、従来の通信方法では、原理的に盗聴することができる点であり、改良された発明では、２経路が必要となる。   The problem to be solved is that in the conventional communication method, eavesdropping can be performed in principle, and in the improved invention, two paths are required.

本発明では、光源から照射された光ビームを第１のビームスプリッターで２つに分け、一方の光ビームに光スイッチを装着し、この光スイッチを制御する信号を送信信号とし、又、他方の光ビームを遅延ラインを通し、２つに分けた一方と他方の光ビームを第２のビームスプリッターで合わせて送信装置で送信し、受信装置では、合わせて送信された光ビームを第２のビームスプリッターで分離し、一方の光ビームを第２の光スイッチでサンプリングし、他方の光ビームを第３のスイッチでサンプリングするとともに遅延ラインを通し、一方の光ビームと他方の光ビームを第４のビームスプリッターで干渉させて、第１、第２の検出器でそれぞれの干渉を検出し、検出した信号で受信器を動作して、情報を送受信するようにした干渉制御による情報通信方法及びその装置である。   In the present invention, a light beam emitted from a light source is divided into two by a first beam splitter, an optical switch is attached to one of the light beams, a signal for controlling this optical switch is used as a transmission signal, and the other The light beam is passed through the delay line, and the one divided into the two and the other light beam are combined by the second beam splitter and transmitted by the transmitting device, and the receiving device transmits the combined light beam transmitted to the second beam. One light beam is sampled by the second optical switch, the other light beam is sampled by the third switch and passed through the delay line, and the one light beam and the other light beam are separated by the fourth optical switch. According to interference control in which interference is performed by a beam splitter, each interference is detected by the first and second detectors, and the receiver is operated with the detected signals to transmit and receive information. The information communication method and apparatus.

本発明の干渉制御による情報通信方法及び装置では、光ビームを取り出した場合は、受信機の検出器で干渉が崩れてしまい、受信信号を受信することができないので、盗聴がされていることをすぐに確認することができ、一方、盗聴者も信号を復元できないので、盗聴されることがないという利点がある。   In the information communication method and apparatus according to the interference control of the present invention, when the light beam is extracted, the interference is destroyed by the detector of the receiver and the received signal cannot be received. There is an advantage that the eavesdropper cannot be eavesdropped because the eavesdropper cannot restore the signal immediately.

図１は本発明の実施例の干渉制御による情報通信方法及び装置を説明するための送信装置の構成図で、光ビームを照射する光源１から照射された光ビーム２は、ハーフミラーからなる第１のビームスプリッター３で２つの光ビーム２ａ、２ｂに分けられ、第１の光ビーム２ａは、遮断したり、通過させたりすることができるようにオン・オフされる光スイッチ４に入力され、この光スイッチ４をオン・オフする送信機５が光スイッチ４に接続され、光スイッチ４を通過した光ビーム２ａは第１の通路を通って第２のビームスプリッター６に送られ、一方、第１のビームスプリッター３で分けられた第２の光ビーム２ｂは第１の遅延ライン７を通過して第２のビームスプリッター６に送られ、この第２のビームスプリッター６で第１の光ビーム２ａと第２の光ビーム２ｂが合わされ送信されるように送信装置８が構成される。   FIG. 1 is a block diagram of a transmitting apparatus for explaining an information communication method and apparatus based on interference control according to an embodiment of the present invention. A light beam 2 emitted from a light source 1 that emits a light beam is a half mirror. The first light beam 2a is divided into two light beams 2a and 2b by one beam splitter 3, and the first light beam 2a is input to an optical switch 4 which is turned on / off so that it can be blocked or passed, A transmitter 5 for turning on / off the optical switch 4 is connected to the optical switch 4, and the light beam 2a that has passed through the optical switch 4 is sent to the second beam splitter 6 through the first path, The second light beam 2 b divided by the first beam splitter 3 passes through the first delay line 7 and is sent to the second beam splitter 6, and the first light beam is transmitted by the second beam splitter 6. Transmission device 8 is configured as a second light beam 2b is transmitted is combined.

図２は本発明の実施例の干渉制御による情報通信方法及び装置を説明するための受信装置の構成図で、送信装置８から送信された第１、第２の光ビーム２ａ、２ｂが合わされた光ビームは第３のビームスプリッター９で第１、第２の光ビーム２ａ、２ｂに分けられ、第１の光ビーム２ａは第２の光スイッチ１０に入力されて、第１のサンプリング装置１１からの信号でサンプリングされて遅延ライン１２を通過して、第２の光ビーム２ｂとの遅延差が解消されて第４のビームスプリッター１３に送られ、又、第３のビームスプリッター９で分離された第２の光ビーム２ｂは第３の光スイッチ１４に入力されて、第２のサンプリング装置１５からの信号でサンプリングされ、第４のビームスプリッター１３に送られ、この第４のビームスプリッター１３で第１、第２の光ビーム２ａ、２ｂの干渉が取られ、この干渉は第１の検出器１６及び第２の検出器１７で検出され、第１の検出器１６及び第２の検出器１７で検出された信号は受信機１８に入力されるようにした受信装置１９が構成される。   FIG. 2 is a block diagram of a receiving apparatus for explaining an information communication method and apparatus using interference control according to an embodiment of the present invention. The first and second light beams 2a and 2b transmitted from the transmitting apparatus 8 are combined. The light beam is divided into first and second light beams 2 a and 2 b by the third beam splitter 9, and the first light beam 2 a is input to the second optical switch 10 and is output from the first sampling device 11. The signal is sampled and passed through the delay line 12, the delay difference from the second light beam 2 b is eliminated and sent to the fourth beam splitter 13, and further separated by the third beam splitter 9. The second light beam 2 b is input to the third optical switch 14, sampled with a signal from the second sampling device 15, and sent to the fourth beam splitter 13, and this fourth beam splitting is performed. −13, the interference of the first and second light beams 2a and 2b is taken, and this interference is detected by the first detector 16 and the second detector 17, and the first detector 16 and the second detector The signal detected by the detector 17 is configured as a receiving device 19 that is input to the receiver 18.

このように構成した本実施例の干渉制御による情報通信方法及び装置では、光源１から第１のビームスプリッター２で分けられた第１の光ビーム２ａは第１のスイッチ４に入力されて、送信機５からの信号でオン・オフされて第２のビームスプリッター６に入力され、又、第２の光ビーム２ｂが第２の遅延ライン１２を通過して第２のビームスプリッター７に送られると、２つの信号は合わされて受信装置１９に入力され、受信装置１９では、送信された光ビームをそれぞれ第１の光ビーム２ａ、第２の光ビーム２ｂに分離してそれぞれ第１、第２のサンプリング装置１１、１５によりそれぞれサンプリングされ、第１の光ビーム２ａは遅延ライン１２を通過して第２の光ビーム２ｂとの遅延差が解消され、こ第１、第２の光ビーム２ａ、２ｂは第４のビームスプリッター１３に入力されて、ここで干渉が取られ、その時、送信機５からの信号で遮断されて第１の光ビーム２ａがない場合は、干渉がないので、第４のビームスプリッター１３で第２の光ビーム２ｂは５０％の確率で、反射及び透過されて、第１の検出器１６及び第２の検出器１７に入力され、そこで、第１の光ビーム２ａが第４のビームスプリッター１３に入力されると、第２の光ビーム２ｂとの干渉が生じ、第２の検出器１７に入力されている光ビームが消され、第１の検出器１６にのみ光ビームが入力されることになるか、あるいは、第２の検出器１７のみで検出されようになるが、これは、２つの光ビーム２ａ、２ｂの光路長を第１、第２の遅延ライン７、１２で調整することによって設定することができる。   In the information communication method and apparatus by interference control of the present embodiment configured as described above, the first light beam 2a divided from the light source 1 by the first beam splitter 2 is input to the first switch 4 and transmitted. When the signal from the machine 5 is turned on / off and input to the second beam splitter 6, and the second light beam 2 b passes through the second delay line 12 and is sent to the second beam splitter 7. The two signals are combined and input to the receiver 19, which separates the transmitted light beam into a first light beam 2 a and a second light beam 2 b, respectively, and first and second signals, respectively. The first and second light beams 2a and 2 are sampled by the sampling devices 11 and 15, respectively. The first light beam 2a passes through the delay line 12 and the delay difference from the second light beam 2b is eliminated. Is input to the fourth beam splitter 13, where interference is taken. At that time, if there is no first light beam 2a because it is interrupted by the signal from the transmitter 5, The second light beam 2b is reflected and transmitted by the beam splitter 13 with a probability of 50%, and is input to the first detector 16 and the second detector 17, where the first light beam 2a is converted into the first light beam 2a. 4 is input to the beam splitter 13, interference with the second light beam 2 b occurs, the light beam input to the second detector 17 is extinguished, and the light beam is applied only to the first detector 16. , Or only the second detector 17 detects the optical path lengths of the two light beams 2a and 2b by the first and second delay lines 7, 12 can be set by adjusting

従って、第１の光ビーム２ａを光スイッチ４でオン・オフすることにより、第１、第２の検出器１５、１６に入力される光ビームがオン・オフされるため、このオン・オフを受信機１７で受信することにより、送信機５からの送信信号は受信機１０で受信され、ここで、第１の光ビーム２ａを取り出した場合は、干渉が崩れるため、第１、第２の検出器１６、１７で常に検出されるようになるため、盗聴が行われていることがすぐに発見でき、又、盗聴者は入手した信号を復元することができないため、盗聴をすることができない。   Accordingly, by turning on / off the first light beam 2a with the optical switch 4, the light beams input to the first and second detectors 15, 16 are turned on / off. By receiving by the receiver 17, the transmission signal from the transmitter 5 is received by the receiver 10. Here, when the first light beam 2a is extracted, the interference is lost, so the first and second signals are transmitted. Since the detectors 16 and 17 are always detected, it can be immediately detected that an eavesdropping is being performed, and since the eavesdropper cannot restore the obtained signal, the eavesdropper cannot eavesdrop. .

図３は本発明の他の実施例の干渉制御による情報通信方法及び装置の送信装置を説明する構成図、図４は図３の送信装置からの信号を受信する受信装置の構成図で、１は光源、２は光ビーム、２ａは第１の光ビーム、２ｂは第２の光ビーム、３は第４のビームスプリッター、１６は第１の検出器、１７は第２の検出器、１８０は受信機、１９は受信装置でこれらの構成は上記実施例と同じであるので、説明は省略するが、本実施例では、第２のビームスプリッター６の代わりに第４の光スイッチ２０で光ビームが合わされて受信装置１９に送信され、受信装置１９では、合わされた第１の光ビーム２ａと第２の光ビーム２ｂは第５の光スイッチ２１で分離され、第１の光ビーム２ａは第２の遅延ライン１２を通過して、第２の光ビーム２ｂとの遅延時間が解消されて第４のビームスプリッター１３に送られ、第５の光スイッチ２１で分けられた第２の光ビーム２ｂは第５のビームスプリッター１３に送られて合わされると、第１、第２のの光ビーム２ａ、２ｂの干渉が生じ、第２の検出器１７に入力されている光ビームが消され、第１の検出器１６にのみ光ビームが入力されることになるか、あるいは、第２の検出器１７のみで検出されるが、これは、２つの光ビームの光路長を第１、第２の遅延ライン７、１２を調整することによって設定される。   FIG. 3 is a block diagram illustrating a transmitting apparatus of an information communication method and apparatus using interference control according to another embodiment of the present invention. FIG. 4 is a block diagram of a receiving apparatus for receiving a signal from the transmitting apparatus of FIG. Is a light source, 2 is a light beam, 2a is a first light beam, 2b is a second light beam, 3 is a fourth beam splitter, 16 is a first detector, 17 is a second detector, and 180 is A receiver 19 is a receiving apparatus, and since the configuration thereof is the same as that in the above embodiment, the description thereof will be omitted. In this embodiment, a light beam is replaced by a fourth optical switch 20 instead of the second beam splitter 6. Are combined and transmitted to the receiving device 19. In the receiving device 19, the combined first light beam 2a and second light beam 2b are separated by the fifth optical switch 21, and the first light beam 2a is the second light beam 2a. Through the second delay line 12 and the second light beam 2b When the delay time is eliminated and sent to the fourth beam splitter 13, and the second light beam 2b divided by the fifth optical switch 21 is sent to the fifth beam splitter 13 and combined, The interference of the second light beams 2a, 2b occurs, the light beam input to the second detector 17 is extinguished, and the light beam is input only to the first detector 16; Alternatively, it is detected only by the second detector 17, which is set by adjusting the first and second delay lines 7 and 12 for the optical path lengths of the two light beams.

本実施例でも、上記実施例と同様に第１、第２の光ビームの干渉が取られ、第１、第２の検出器１６、１７の出力を検出することにより通信が可能になる。   Also in this embodiment, the first and second light beams interfere with each other as in the above embodiment, and communication is possible by detecting the outputs of the first and second detectors 16 and 17.

以上の説明では、光路を空気中で行うようにしたが、この光路を光ファイバとすれば、産業上の利用が容易になる。   In the above description, the optical path is performed in the air. However, if this optical path is an optical fiber, industrial use is facilitated.

本発明の実施例の干渉制御による情報通信方法及び装置の送信装置を説明する構成図である。It is a block diagram explaining the transmission apparatus of the information communication method and apparatus by interference control of the Example of this invention. 図１の送信装置からの信号を受信するための受信装置の構成を説明する構成図である。It is a block diagram explaining the structure of the receiver for receiving the signal from the transmitter of FIG. 本発明の他の実施例の干渉制御による情報通信方法及び装置の送信装置を説明する構成図である。It is a block diagram explaining the transmission apparatus of the information communication method and apparatus by interference control of the other Example of this invention. 図３の送信装置からの信号を受信するための受信装置の構成を説明する構成図である。It is a block diagram explaining the structure of the receiver for receiving the signal from the transmitter of FIG.

符号の説明Explanation of symbols

１ 光源
２ａ 第１の光ビーム
２ｂ 第２の光ビーム
３ 第１のビームスプリッター
４ 第１の光スイッチ
５ 送信機
６ 第２のビームスプリッター
７ 第１の遅延ライン
８ 送信装置
９ 第３のビームスプリッター
１０ 第２の光スイッチ
１１ 第１のサンプリング装置
１２ 第２の遅延ライン
１３ 第４のビームスプリッター
１４ 第３の光スイッチ
１５ 第２のサンプリング装置
１６ 第１の検出器
１７ 第２の検出器
１８ 受信機
１９ 受信装置
２０ 第４の光スイッチ
２１ 第５の光スイッチ DESCRIPTION OF SYMBOLS 1 Light source 2a 1st light beam 2b 2nd light beam 3 1st beam splitter 4 1st optical switch 5 Transmitter 6 2nd beam splitter 7 1st delay line 8 Transmitter 9 Third beam splitter DESCRIPTION OF SYMBOLS 10 2nd optical switch 11 1st sampling device 12 2nd delay line 13 4th beam splitter 14 3rd optical switch 15 2nd sampling device 16 1st detector 17 2nd detector 18 Reception Machine 19 Receiver 20 Fourth optical switch 21 Fifth optical switch

Claims (4)

光源より照射されたビーム光線を第１のビームスプリッターで２つの光ビームに分け、該第１のビームスプリッターにより分けられた一方の光ビームを第１の光スイッチで遮断、通過するように送信機からの送信信号でコントロールし、他方の光ビームは遅延ラインを通し、前記遮断、通過するようにした一方の光線と前記遅延ラインを通した他方の光ビームとを第２のビームスプリッターで合わせて送信し、送信された光ビームを第３のビームスプリッターで一方の光ビームと他方の光ビームに分離するとともに、一方の光ビームを第２の光スイッチでサンプリングし、他方の光ビームを第３の光スイッチでサンプリングとともに遅延ラインを通して光路差を解消し、分離された一方の光ビームと他方の光ビームを第４のビームスプリッターで干渉させることにより、第１、第２の検出器でそれぞれの干渉を検出し、検出した信号で受信器を動作することにより情報を送受信することを特徴とする干渉制御による情報通信方法。   Transmitter that splits light beam emitted from light source into two light beams by first beam splitter and blocks and passes one light beam divided by first beam splitter by first optical switch The other light beam passes through the delay line, and the other light beam passed through the delay line and the other light beam passed through the delay line are combined by the second beam splitter. The transmitted light beam is separated into one light beam and the other light beam by the third beam splitter, and one light beam is sampled by the second optical switch, and the other light beam is third. In the optical switch, the optical path difference is canceled through the delay line together with sampling, and the separated one light beam and the other light beam are connected to the fourth beam splitter. By interfering in, first, in the second detector detects the respective interference information communication method according to the interference control, characterized by transmitting and receiving information by operating the receiver with the detected signal. 光源より照射されたビーム光線を第１のビームスプリッターで２つの光ビームに分け、該第１のビームスプリッターにより分けられた一方の光ビームを第１の光スイッチで遮断、通過するように送信機からの送信信号でコントロールし、他方の光ビームは遅延ラインを通し、前記遮断、通過するようにした一方の光線と前記遅延ラインを通した他方の光ビームとを第４の光スイッチで合わせて送信し、送信された光ビームを第５のビームスプリッターで一方の光ビームと他方の光ビームに分離するとともに、他方の光ビームを遅延ラインを通して光路差を解消し、分離された一方の光ビームと他方の光ビームを第４のビームスプリッターで干渉させることにより、第１、第２の検出器でそれぞれの干渉を検出し、検出した信号で受信器を動作することにより情報を送受信することを特徴とする干渉制御による情報通信方法。   Transmitter that splits light beam emitted from light source into two light beams by first beam splitter and blocks and passes one light beam divided by first beam splitter by first optical switch The other light beam passes through the delay line, and the other light beam passed through the delay line and the other light beam passed through the delay line are combined by a fourth optical switch. The transmitted light beam is separated into one light beam and the other light beam by the fifth beam splitter, and the other light beam is eliminated through the delay line to eliminate the optical path difference. The first and second detectors detect the interference by causing the other beam to interfere with the other beam, and operate the receiver with the detected signal. Information communication method according to the interference control, characterized by transmitting and receiving information by Rukoto. 光ビームを照射する光源と、該光源からの光ビームを２つに分ける第１のビームスプリッターと、該第１のビームスプリッターにより分けられた一方の光ビームを遮断、通過するように装着された第１の光スイッチと、該第１の光スイッチを制御する送信機と、他方の光ビームを遅延させる第１の遅延ラインと、前記第１の光スイッチを通過する一方の光ビームと前記遅延された他方の光ビームとを合わせる第２のビームスプリッターとからなる送信装置と、該送信装置から送信された光ビームを分離する第３のビームスプリッターと、第３のビームスプリッターで分離された一方の光ビームをサンプリングする第２の光スイッチと、第３のビームスプリッターで分離された他方の光ビームをサンプリングする第４の光スイッチと、第４の光スイッチを通過した他方の光ビームを遅延する第２の遅延ラインと、第２の光スイッチを通過した一方の光ビームと遅延ラインを通過した他方の光ビームを合わせて干渉させる第４のビームスプリッターと、一方の光ビームと他方の光ビームの干渉をそれぞれ検出する第１、第２の検出器と、該第１、第２の検出器の出力を受信する受信器とからなる受信装置とからなることを特徴とする干渉制御による情報通信装置。   A light source that irradiates a light beam, a first beam splitter that divides the light beam from the light source into two, and one light beam that is divided by the first beam splitter is mounted so as to be blocked and passed. A first optical switch, a transmitter for controlling the first optical switch, a first delay line for delaying the other optical beam, one optical beam passing through the first optical switch, and the delay A transmission device comprising a second beam splitter for combining the other light beam, a third beam splitter for separating the light beam transmitted from the transmission device, and one separated by the third beam splitter A second optical switch that samples the second optical beam, a fourth optical switch that samples the other optical beam separated by the third beam splitter, and a fourth light A second delay line that delays the other light beam that has passed through the switch, and a fourth beam splitter that causes the one light beam that has passed through the second optical switch to interfere with the other light beam that has passed through the delay line. And a receiving device comprising first and second detectors for detecting interference between the one light beam and the other light beam, and a receiver for receiving the outputs of the first and second detectors, respectively. An information communication apparatus by interference control, characterized in that 光ビームを照射する光源と、該光源からの光ビームを２つに分ける第１のビームスプリッターと、該第１のビームスプリッターにより分けられた一方の光ビームを遮断、通過するように装着された第１の光スイッチと、該第１の光スイッチを制御する送信機と、他方の光ビームを遅延させる第１の遅延ラインと、前記第１の光スイッチを通過する一方の光ビームと前記遅延された他方の光ビームとを合わせる第４の光スイッチとからなる送信装置と、該送信装置から送信された光ビームを分離する第５の光スイッチと、第５の光スイッチで分離された他方の光ビームを遅延する遅延ラインと、第５の光スイッチで分離された一方の光ビームと前記遅延ラインを通過した他方の光ビームを合わせて干渉させる第４のビームスプリッターと、一方の光ビームと他方の光ビームの干渉をそれぞれ検出する第１、第２の検出器と、該第１、第２の検出器の出力を受信する受信器とからなる受信装置とからなることを特徴とする干渉制御による情報通信装置。
A light source that irradiates a light beam, a first beam splitter that divides the light beam from the light source into two, and one light beam that is divided by the first beam splitter is mounted so as to be blocked and passed. A first optical switch, a transmitter for controlling the first optical switch, a first delay line for delaying the other optical beam, one optical beam passing through the first optical switch, and the delay A transmission device comprising a fourth optical switch for combining the other optical beam, a fifth optical switch for separating the optical beam transmitted from the transmission device, and the other separated by the fifth optical switch A delay line that delays the optical beam of the first optical beam, a fourth beam splitter that causes the one optical beam separated by the fifth optical switch to interfere with the other optical beam that has passed through the delay line, A receiving apparatus comprising first and second detectors for detecting interference between the light beam and the other light beam, and a receiver for receiving the outputs of the first and second detectors, respectively. An information communication device by interference control.
JP2004104330A 2004-03-31 2004-03-31 Information communication method by interference control, and its apparatus Pending JP2005295018A (en)

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Publication number Priority date Publication date Assignee Title
US8275292B2 (en) 2009-08-28 2012-09-25 Fuji Xerox Co., Ltd. Epichlorohydrin composition for conductive roller, conductive roller, charging unit, image forming apparatus, process cartridge, and method of manufacturing conductive roller
WO2015133089A1 (en) * 2014-03-05 2015-09-11 古河電気工業株式会社 Optical communication method and system
CN108923859A (en) * 2018-07-16 2018-11-30 西安空间无线电技术研究所 A kind of coherent tracking device and method based on electro-optical deflection

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JPH1051385A (en) * 1996-08-02 1998-02-20 Nec Corp Space light transmitter
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JPH1051385A (en) * 1996-08-02 1998-02-20 Nec Corp Space light transmitter
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8275292B2 (en) 2009-08-28 2012-09-25 Fuji Xerox Co., Ltd. Epichlorohydrin composition for conductive roller, conductive roller, charging unit, image forming apparatus, process cartridge, and method of manufacturing conductive roller
WO2015133089A1 (en) * 2014-03-05 2015-09-11 古河電気工業株式会社 Optical communication method and system
CN108923859A (en) * 2018-07-16 2018-11-30 西安空间无线电技术研究所 A kind of coherent tracking device and method based on electro-optical deflection

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