JPH03208012A - Optical signal transmission method - Google Patents
Optical signal transmission methodInfo
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- JPH03208012A JPH03208012A JP2002715A JP271590A JPH03208012A JP H03208012 A JPH03208012 A JP H03208012A JP 2002715 A JP2002715 A JP 2002715A JP 271590 A JP271590 A JP 271590A JP H03208012 A JPH03208012 A JP H03208012A
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- signal
- optical signal
- signal input
- wavelength
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- 230000003287 optical effect Effects 0.000 title claims abstract description 51
- 230000008054 signal transmission Effects 0.000 title claims abstract description 35
- 238000000034 method Methods 0.000 title claims description 22
- 239000011159 matrix material Substances 0.000 claims abstract description 24
- 230000003595 spectral effect Effects 0.000 abstract 3
- 238000010586 diagram Methods 0.000 description 7
- 230000010365 information processing Effects 0.000 description 6
- 238000004891 communication Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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Abstract
Description
【発明の詳細な説明】
〔概 要〕
情報処理装置等において信号出力面から信号入力面に光
信号を伝達するバスに関し、
構成要素の位置決め等信号伝達路の形或が容易で信号入
力面の選択切替えを高速化できる光信号伝達方法の提供
を目的とし、
発光素子がマトリックス状に配列された信号出力面と、
受光素子がマトリックス状に配列された複数の信号入力
面との間に、特定波長の光を反射し他の波長の光を透過
する反射型フィルタと、全ての光を透過するセルがマト
リックス状に配列された複数の分光素子を有し、且つ、
信号出力面を波長域の広い発光素子で構成すると共に、
分光素子毎に反射光の波長が異なる反射型フィルタを配
し、信号出力面から出力される光信号を波長によって弁
別し各信号入力面に分配するよう構成する。[Detailed Description of the Invention] [Summary] Regarding a bus that transmits optical signals from a signal output surface to a signal input surface in an information processing device, etc., the shape of the signal transmission path, such as the positioning of components, can be easily changed, and the signal input surface can be easily adjusted. With the aim of providing an optical signal transmission method that can speed up selection switching, we developed a signal output surface with light emitting elements arranged in a matrix,
Between a plurality of signal input surfaces in which light-receiving elements are arranged in a matrix, there is a reflective filter that reflects light of a specific wavelength and transmits light of other wavelengths, and a matrix of cells that transmit all light. It has a plurality of arranged spectroscopic elements, and
The signal output surface is composed of light emitting elements with a wide wavelength range, and
A reflection type filter whose reflected light has a different wavelength is arranged for each spectroscopic element, and the optical signal outputted from the signal output surface is discriminated based on the wavelength and distributed to each signal input surface.
本発明は情報処理装置等において信号出力面から信号入
力面に光信号を伝達するバスに係り、特に各素子の位置
決めが容易で高速切替えが可能な光信号伝達方法に関す
る。The present invention relates to a bus for transmitting optical signals from a signal output surface to a signal input surface in an information processing device or the like, and particularly to an optical signal transmission method that allows easy positioning of each element and high-speed switching.
電子化された情報処理装置では多数ある始点の中の任意
のものから、多数ある終点の中の任意のものに対し信号
を伝達する手段として、一般にバス（ｂｕｓ）と称する
共通信号伝達路が用いられている。しかるに近年光応用
システムの進歩に伴って電子の代わりに光を用いる情報
処理装置が現れ、かかる情報処理装置においても信号を
高速度に伝達できる光信号伝達路の実現が要望されてい
る。In computerized information processing devices, a common signal transmission path called a bus is generally used as a means for transmitting signals from any one of many starting points to any one of many ending points. It is being However, in recent years, with the progress of optical application systems, information processing devices that use light instead of electrons have appeared, and there is a demand for the realization of optical signal transmission paths that can transmit signals at high speed in such information processing devices as well.
第４図は従来の光信号伝達方法を示す模式図である。 FIG. 4 is a schematic diagram showing a conventional optical signal transmission method.
情報処理装置等では図示の如く発光素子１１がマトリッ
クス状に配列された信号出力面１と、受光素子２１がマ
トリックス状に配列された複数の信号入力面２ａ、２ｂ
、２ｃを所定の位置に設け、複数の信号入力面２ａ，
２ｂ， ２ｃの中のいずれか一つ或いは複数を選択して
、信号出力面１に表示された画像や情報を信号入力面に
人力する場合が多い。As shown in the figure, an information processing device, etc. has a signal output surface 1 in which light emitting elements 11 are arranged in a matrix, and a plurality of signal input surfaces 2a and 2b in which light receiving elements 21 are arranged in a matrix.
, 2c are provided at predetermined positions, and a plurality of signal input surfaces 2a,
In many cases, one or more of 2b and 2c is selected to input the image or information displayed on the signal output surface 1 to the signal input surface.
そこで従来の光信号伝達方法では各信号入力面２ａ、２
ｂ、２ｃに対応する偏向業ラー３を設け、光信号を信号
入力面２ａに人力する場合は光ビームを信号入力面２ａ
の方に、また光信号を信号入力面２ｂに入力する場合は
光ビームを信号入力面２ｂの方に、更に光信号を信号入
力面２ｃに入力する場合は光ビームを信号入力面２ｃの
方に偏向させている。Therefore, in the conventional optical signal transmission method, each signal input surface 2a, 2
A deflector 3 corresponding to b and 2c is provided, and when the optical signal is input manually to the signal input surface 2a, the light beam is transferred to the signal input surface 2a.
When inputting an optical signal to the signal input surface 2b, the light beam is directed toward the signal input surface 2b, and when an optical signal is input to the signal input surface 2c, the light beam is directed toward the signal input surface 2c. It is biased towards.
信号出力面に表示された画像や情報を正確に信号入力面
に入力するには、それぞれの発光素子が出力する光信号
を対応する受光素子に伝える必要がある。しかるに機械
的に光ビームを偏向させる従来の光信号伝達方法では、
極く僅かな偏向角度の誤差によって対象外の受光素子に
信号が入力されるため、高精度の駆動機構を具えた偏向
ミラーを高精度に配置しなければならない．
また信号入力面の切換時に機械的に偏向ミラーを駆動す
るため、要求される信号伝達速度に比べ偏向ミラーの切
替えに著しく時間がかかるという問題があった。In order to accurately input the image or information displayed on the signal output surface to the signal input surface, it is necessary to transmit the optical signal output from each light emitting element to the corresponding light receiving element. However, in the conventional optical signal transmission method that mechanically deflects the optical beam,
Because a signal is input to a non-target photodetector due to an extremely small error in the deflection angle, a deflection mirror equipped with a high-precision drive mechanism must be placed with high precision. Furthermore, since the deflection mirror is mechanically driven when switching the signal input surface, there is a problem in that switching the deflection mirror takes much longer than the required signal transmission speed.
本発明の目的は構或要素の位置決め等信号伝達路の形威
が容易で、信号入力面の選択切替えを高速化できる光信
号伝達方法を提供することにある。SUMMARY OF THE INVENTION An object of the present invention is to provide an optical signal transmission method that facilitates the configuration of signal transmission paths such as positioning of structural elements and speeds up selection and switching of signal input surfaces.
第１図は本発明になる光信号伝達方法を示す原理図であ
る。なお全図を通し同し対象物は同一記号で表している
。FIG. 1 is a principle diagram showing the optical signal transmission method according to the present invention. The same objects are represented by the same symbols throughout the figures.
上記課題は発光素子１１がマトリックス状に配列された
信号出力面１と、受光素子２ｌがマトリックス状に配列
された複数の信号入力面２との間に、特定波長の光を反
射し他の波長の光を透過する反射型フィルタ４１と、全
ての光を透過するセル４２がマトリックス状に配列され
た複数の分光素子４を有し、且つ、信号出力面工を波長
域の広い発光素子１１で構成すると共に、分光素子４毎
に反射光の波長が異なる反射型フィルタ４１を配し、信
号出力面１から出力される光信号を波長によって弁別し
、各信号入力面２に分配する本発明の光信号伝達方法に
よって達戒される。The problem described above is that light of a specific wavelength is reflected between a signal output surface 1 in which light emitting elements 11 are arranged in a matrix and a plurality of signal input surfaces 2 in which light receiving elements 2l are arranged in a matrix. It has a plurality of spectroscopic elements 4 in which a reflection type filter 41 that transmits the light of In addition, a reflective filter 41 whose reflected light has a different wavelength is arranged for each spectroscopic element 4, and the optical signal outputted from the signal output surface 1 is discriminated by wavelength and distributed to each signal input surface 2. The precepts are achieved through optical signal transmission methods.
［作 用］
第１図において発光素子がマトリックス状に配列された
信号出力面と、受光素子がマトリックス状に配列された
複数の信号入力面との間に、特定波長の光を反射し他の
波長の光を透過する反射型フィルタと、全ての光を透過
するセルがマトリックス状に配列された複数の分光素子
を有し、且つ、信号出力面を波長域の広い発光素子で構
威すると共に、分光素子毎に反射光の波長が異なる反射
型フィルタを配し、信号出力面から出力される光信号を
波長によって弁別し、各信号入力面に分配する本発明の
光信号伝達方法によって、信号入力面の切換時に機械的
に駆動される偏向ξラーが不要になり、信号伝達路を形
或する構或要素の位置決め等が容易になると共に、信号
入力面の選択切替えを高速化できる光信号伝達方法を実
現することができる。[Function] In Fig. 1, light of a specific wavelength is reflected between a signal output surface where light emitting elements are arranged in a matrix and a plurality of signal input surfaces where light receiving elements are arranged in a matrix. It has a reflective filter that transmits light of different wavelengths and a plurality of spectroscopic elements in which cells that transmit all light are arranged in a matrix, and the signal output surface is composed of light emitting elements with a wide wavelength range. By the optical signal transmission method of the present invention, in which a reflective filter with a different wavelength of reflected light is arranged for each spectroscopic element, the optical signal output from the signal output surface is discriminated by wavelength, and the signal is distributed to each signal input surface. The optical signal eliminates the need for a mechanically driven deflection roller when switching the input surface, making it easier to position the structural elements that form the signal transmission path, and speeding up the selection and switching of the signal input surface. A communication method can be realized.
以下添付図により本発明の実施例について詳細に説明す
る。第２図は本発明になる光信号伝達方法の一実施例を
示す図、第３図は本発明になる光信号伝達方法の変形例
を示す模式図である。Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. FIG. 2 is a diagram showing an embodiment of the optical signal transmission method according to the invention, and FIG. 3 is a schematic diagram showing a modification of the optical signal transmission method according to the invention.
本発明になる光信号伝達方法の一実施例は第２図（ａ）
に示す如く、ＣＲＴやＬＥＤアレイ等の自己発光型ディ
スプレイ、或いは照明用光源を具えた液晶等の非発光型
ディスプレイを信号出力面１とし、ディスプレイの画像
表示面にマトリックス状に配列された発光素子１１は、
例えば第２図（ロ）に示すλ，、λ２、λ３なる光を含
む波長域の広い光を出力する。また複数の信号入力面２
ａ、２ｂ、２ｃはそれぞれマトリックス状に配列された
受光素子２１、例えばフォトダイオードアレイ等によっ
て構威されている。An embodiment of the optical signal transmission method according to the present invention is shown in FIG. 2(a).
As shown in Figure 2, the signal output surface 1 is a self-luminous display such as a CRT or an LED array, or a non-luminous display such as a liquid crystal display equipped with a light source for illumination, and light emitting elements are arranged in a matrix on the image display surface of the display. 11 is
For example, it outputs light with a wide wavelength range including lights λ, λ2, and λ3 shown in FIG. 2(b). Also, multiple signal input surfaces 2
A, 2b, and 2c are each composed of light receiving elements 21 arranged in a matrix, such as a photodiode array.
信号出力面工と複数の信号入力面２ａ、２ｂ、２ｃとの
間には、各信号入力面に対応する分光素子４ａ、４ｂ、
４ｃが配設されており、第２図（Ｃ）に示す如く分光素
子４ａはマトリックス状に配列された反射型フィルタ４
１ａとセル４２とで、分光素子４ｂはマトリックス状に
配列された反射型フィルタ４ｌｂとセル４２とで、分光
素子４ｃはマトリックス状に配列された反射型フィルタ
４１ｃとセル４２とで構威されている。Between the signal output surface processing and the plurality of signal input surfaces 2a, 2b, 2c, there are spectroscopic elements 4a, 4b, corresponding to each signal input surface.
4c, and as shown in FIG. 2(C), the spectroscopic element 4a includes reflective filters 4 arranged in a matrix.
1a and cells 42, the spectroscopic element 4b consists of reflection filters 4lb and cells 42 arranged in a matrix, and the spectroscopic element 4c consists of reflection filters 41c and cells 42 arranged in a matrix. There is.
なお反射型フィルタは波長選択性を有する体積型位相ホ
ログラムや誘電体多層膜からなり、分光素子４ａ、４ｂ
、４ｃにおいてセル４２は全ての光を通すが、反射型フ
ィルタ４１ａは例えばλ，なる波長の光を反射し他の光
を通す．また反射型フィルタ４ｌｂはλ２なる波長の光
を反射し他の光を通す。更に反射型フィルタ４１ｃはλ
，なる波長の光を反射し他の光を通すように構威されて
いる。Note that the reflection filter is made of a volume type phase hologram or a dielectric multilayer film having wavelength selectivity, and includes the spectroscopic elements 4a and 4b.
, 4c, the cell 42 passes all light, but the reflective filter 41a reflects light with a wavelength of, for example, λ and passes other light. Further, the reflective filter 4lb reflects light with a wavelength of λ2 and passes other light. Furthermore, the reflection type filter 41c is λ
It is designed to reflect light with a certain wavelength and pass other light.
かかる構成になる信号伝達系において例えば発光素子１
１から出力される光信号を、信号入力面２ａ内の対応す
る受光素子２１にのみ入力する場合は、分光素子４ａの
発光素子１ｌと対向する位置に反射型フィルタ４１ａを
配し、分光素子４ｂ、４Ｃの発光素子１１と対向する位
置にセル４２を配することによって、光信号のλ１なる
波長の光が反射されて受光素子２１に入力され、その他
の波長の光は反射されることなく分光素子４ａ、４ｂ、
４ｃを透過する。In a signal transmission system having such a configuration, for example, the light emitting element 1
When the optical signal outputted from 1 is input only to the corresponding light receiving element 21 in the signal input surface 2a, a reflective filter 41a is arranged at a position facing the light emitting element 1l of the spectroscopic element 4a, and the optical signal output from the spectroscopic element 4b is , 4C, by arranging the cell 42 in a position facing the light emitting element 11 of the optical signal, the light of the wavelength λ1 of the optical signal is reflected and input to the light receiving element 21, and the light of other wavelengths is not reflected and is spectralized. Elements 4a, 4b,
Transmits 4c.
同様に信号出力面Ｉ内の発光素子１１から出力される光
信号を、信号入力面２ｂ内の対応する受光素子２ｌにの
み人力する場合は、分光素子４ｂの発光素子１ｌと対向
する位置に反射型フィルタ４ｌｂを配し、分光素子４ａ
、４ｃの発光素子１１と対向する位置にセル４２を配す
ることによって、光信号のλ２なる波長の光が反射され
て受光素子２１に入力される。Similarly, when the optical signal output from the light emitting element 11 in the signal output plane I is manually applied only to the corresponding light receiving element 2l in the signal input plane 2b, it is reflected to the position facing the light emitting element 1l of the spectroscopic element 4b. A type filter 4lb is arranged, and a spectroscopic element 4a
, 4c, by arranging the cell 42 at a position facing the light emitting element 11, the light having the wavelength λ2 of the optical signal is reflected and input to the light receiving element 21.
また信号出力面１内の発光素子１１から出力される光信
号を、信号入力面２ｂ内の受光素子２１と信号入力面２
ｃ内の受光素子２１に人力する場合は、分光素子４ｂの
発光素子１１と対向する位置に反射型フィルタ４ｌｂを
配すると共に、分光素子４ｃの発光素子Ｉ１と対向する
位置に反射型フィルタ４１ｃを配し、分光素子４ａの発
光素子１１に対向する位置にセル４２を配することによ
って、光信号は分光素子４ａを透過しλ２なる波長の光
が信号入力面２ｂの受光素子２１に、また分光素子４ｂ
を透過したλ３なる波長の光が信号入力面２ｃの受光素
子２１に入力される。In addition, the optical signal output from the light emitting element 11 in the signal output surface 1 is transmitted to the light receiving element 21 in the signal input surface 2b and the signal input surface 2.
When the light receiving element 21 in c is manually operated, a reflective filter 4lb is arranged at a position facing the light emitting element 11 of the spectroscopic element 4b, and a reflective filter 41c is placed at a position facing the light emitting element I1 of the spectroscopic element 4c. By arranging the cell 42 at a position facing the light emitting element 11 of the spectroscopic element 4a, the optical signal is transmitted through the spectroscopic element 4a, and the light with a wavelength of λ2 is transmitted to the light receiving element 21 on the signal input surface 2b, and the light signal is transmitted through the spectroscopic element 4a. Element 4b
The light having a wavelength of λ3 that has passed through is input to the light receiving element 21 on the signal input surface 2c.
しかるに第２図に示す信号伝達系は信号出力面と分光素
子の間隔が広くなるに伴って、発光素子から出力された
光信号の輪郭が拡大されて対応するセルや反射型フィル
タのみならず、隣接するセルや反射型フィルタにまで入
力されて信号のクロストークを生じる。同様に分光素子
と信号入力面の間隔が広くなるに伴って光信号の輪郭が
拡大され、対応する受光素子の他に隣接する受光素子に
人力されて信号のクロストークを生じる。However, in the signal transmission system shown in FIG. 2, as the distance between the signal output surface and the spectroscopic element becomes wider, the outline of the optical signal output from the light emitting element is enlarged, and the signal transmission system is affected not only by the corresponding cells and reflection filters, but also by It is also input to adjacent cells and reflection filters, causing signal crosstalk. Similarly, as the distance between the spectroscopic element and the signal input surface becomes wider, the outline of the optical signal is enlarged, and signal crosstalk occurs due to interference with adjacent light receiving elements in addition to the corresponding light receiving element.
そこで本発明になる光信号伝達方法の変形例では第３図
に示す如く、信号出力面工と分光素子４ａ、４ｂ、４ｃ
との間にレンズ５を設け、発光素子１１から出力された
光信号を対応する反射型フィルタ４１またはセル４２に
人力させると共に、分光素子４ａ、４ｂ、４ｃと信号入
力面２ａ， ２ｂ、２ｃとの間にそれぞれレンズ６を設
け、反射型フィルタ４ｌによって反射された光信号を対
応する受光素子２１に入力させている。Therefore, in a modified example of the optical signal transmission method according to the present invention, as shown in FIG.
A lens 5 is provided between the light emitting element 11 and the light signal outputted from the light emitting element 11 to the corresponding reflection filter 41 or cell 42, and the light signal is transmitted between the light emitting elements 4a, 4b, 4c and the signal input surfaces 2a, 2b, 2c. A lens 6 is provided between each of them, and the optical signal reflected by the reflective filter 4l is inputted to the corresponding light receiving element 21.
このように発光素子がマトリックス状に配列された信号
出力面と、受光素子がマトリックス状に配列された複数
の信号入力面との間に、特定波長の光を反射し他の光を
通す反射型フィルタと、全ての光を通すセルがマトリッ
クス状に配列された複数の分光素子を有し、且つ、信号
出力面を波長域の広い発光素子で構威すると共に、分光
素子毎に反射光の波長が異なる反射型フィルタを配し、
信号出力面から出力される光信号を波長によって弁別し
、各信号入力面に分配する本発明の光信号伝達方法によ
って、信号入力面の切換時に機械的に駆動される偏向ミ
ラーが不要になり、信号伝達路を形或する構成要素の位
置決め等が容易になると共に、信号入力面の選択切替え
を高速化できる光信号伝達方法を実現することができる
。A reflective type that reflects light of a specific wavelength and passes other light between a signal output surface where light emitting elements are arranged in a matrix and a plurality of signal input surfaces where light receiving elements are arranged in a matrix. It has a filter and a plurality of spectroscopic elements in which cells that pass all light are arranged in a matrix, and the signal output surface is made up of light emitting elements with a wide wavelength range, and each spectroscopic element can adjust the wavelength of the reflected light. With reflective filters with different
The optical signal transmission method of the present invention, which discriminates the optical signal output from the signal output surface by wavelength and distributes it to each signal input surface, eliminates the need for a mechanically driven deflection mirror when switching the signal input surface. It is possible to realize an optical signal transmission method that facilitates positioning of components forming a signal transmission path and speeds up selection and switching of signal input surfaces.
上述の如く本発明によれば構成要素の位置決め等信号伝
達路の形戒が容易で、信号入力面の選択切替えを高速化
できる光信号伝達方法を提供することができる。As described above, according to the present invention, it is possible to provide an optical signal transmission method in which the shape of the signal transmission path, such as the positioning of the components, can be easily determined, and the selection and switching of the signal input surface can be speeded up.
第１図は本発明になる光信号伝達方法を示す原理図、
を示す模式図、
第４図は従来の光信号伝達方法を示す模式図、である。
図において
１は信号出力面、
２、２ａ、２ｂ、２ｃは信号入力面、
４、４ａ、４ｂ、４Ｃは分光素子、
５、６はレンズ、
１工は発光素子、
２ｌは受光素子、
４１、４１ａ、４ｌｂ、４１ｃは反射型フィルタ、４２
はセル、
をそれぞれ表す。
木允明にｔよう光信号伝達方域乞示す原理図第
１
囚
本発明になる光信号休達方域の麦形例２ホナ榎武目第
３
図
遺長
（ｂ）
木尤明にｔよる尤信号伝慮方法の一実施例を示ナ図第
２
図FIG. 1 is a principle diagram showing the optical signal transmission method according to the present invention; FIG. 4 is a schematic diagram showing the conventional optical signal transmission method. In the figure, 1 is a signal output surface, 2, 2a, 2b, 2c are signal input surfaces, 4, 4a, 4b, 4C are spectroscopic elements, 5, 6 are lenses, 1 is a light emitting element, 2l is a light receiving element, 41, 41a, 4lb, 41c are reflective filters, 42
represent the cell and , respectively. 1. Principle diagram showing the optical signal transmission area according to Moku Yumei 1. Example of the shape of the optical signal transmission area according to the present invention 2. Fig. 2 shows an example of a method for transmitting signals by
Claims (1)
力面（１）と、受光素子（２１）がマトリックス状に配
列された複数の信号入力面（２）との間に、特定波長の
光を反射し他の波長の光を透過する反射型フィルタ（４
１）と、全ての光を透過するセル（４２）がマトリック
ス状に配列された複数の分光素子（４）を有し、 且つ、該信号出力面（１）を波長域の広い発光素子（１
１）で構成すると共に、該分光素子（４）毎に反射光の
波長が異なる反射型フィルタ（４１）を配し、該信号出
力面（１）から出力される光信号を波長によって弁別し
、各信号入力面（２）に分配することを特徴とする光信
号伝達方法。[Claims] Between a signal output surface (1) in which light-emitting elements (11) are arranged in a matrix and a plurality of signal input surfaces (2) in which light-receiving elements (21) are arranged in a matrix. , a reflective filter (4) that reflects light of a specific wavelength and transmits light of other wavelengths.
1), a cell (42) that transmits all light has a plurality of spectroscopic elements (4) arranged in a matrix, and the signal output surface (1) is connected to a light emitting element (1) with a wide wavelength range.
In addition to configuring 1), a reflective filter (41) having a different wavelength of reflected light is arranged for each spectroscopic element (4), and the optical signal output from the signal output surface (1) is discriminated by wavelength, An optical signal transmission method characterized in that the optical signal is distributed to each signal input surface (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002715A JPH03208012A (en) | 1990-01-10 | 1990-01-10 | Optical signal transmission method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002715A JPH03208012A (en) | 1990-01-10 | 1990-01-10 | Optical signal transmission method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03208012A true JPH03208012A (en) | 1991-09-11 |
Family
ID=11537003
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2002715A Pending JPH03208012A (en) | 1990-01-10 | 1990-01-10 | Optical signal transmission method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03208012A (en) |
-
1990
- 1990-01-10 JP JP2002715A patent/JPH03208012A/en active Pending
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