JPH05260018A - Optical transmission system for radio signal - Google Patents
Optical transmission system for radio signalInfo
- Publication number
- JPH05260018A JPH05260018A JP4053699A JP5369992A JPH05260018A JP H05260018 A JPH05260018 A JP H05260018A JP 4053699 A JP4053699 A JP 4053699A JP 5369992 A JP5369992 A JP 5369992A JP H05260018 A JPH05260018 A JP H05260018A
- Authority
- JP
- Japan
- Prior art keywords
- optical
- signal
- optical transmission
- transmission line
- light intensity
- 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.)
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- Mobile Radio Communication Systems (AREA)
- Optical Communication System (AREA)
Abstract
Description
【0001】[0001]
【産業上の利用分野】本発明は、ベースバンド信号の変
・復調を行う送受信端局と無線信号送受信装置(アンテ
ナ)が離れているときに、無線回線を介して送受信する
ための信号を光ファイバケーブルを用いて伝送するため
の無線信号用光伝送システムに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical signal for transmission / reception via a wireless line when a transmitting / receiving terminal station for modulating / demodulating a baseband signal and a wireless signal transmitting / receiving device (antenna) are separated. The present invention relates to an optical transmission system for wireless signals for transmission using a fiber cable.
【0002】[0002]
【従来の技術】この種の分野において、光ファイバ内を
伝送する光の強弱により無線周波信号を伝送する光伝送
システムは、光ファイバを用いた広帯域、低損失伝送と
いう特長をいかして、従来の同軸ケーブル等の電気信号
伝送手段に代わるものとして注目されており、その伝送
システムの構成などが検討されている。2. Description of the Related Art In this type of field, an optical transmission system for transmitting a radio frequency signal according to the intensity of light transmitted through an optical fiber is a conventional optical transmission system utilizing the characteristics of wide band and low loss transmission using the optical fiber. It has attracted attention as an alternative to electric signal transmission means such as a coaxial cable, and the configuration of the transmission system has been studied.
【0003】この伝送システムの適用の一例として、多
数の小ゾーン無線エリアより構成される移動通信システ
ムが挙げられる。この通信システムは、送信端局の配さ
れた中央局とアンテナ等の送信装置の配された基地局よ
り構成される。基地局は数多く設置することになるの
で、その設備を小型・軽量・簡略化することが必要とな
る。この通信システムで用いられる光伝送システムでは
一般的に、レーザダイオードなどの電気・光変換素子、
光ファイバ伝送線路及びフォトダイオードなどの光・電
気変換素子を用いた光強度変調・光強度検波方式を用い
る。An example of application of this transmission system is a mobile communication system composed of a large number of small zone radio areas. This communication system includes a central station in which a transmitting terminal station is arranged and a base station in which a transmitting device such as an antenna is arranged. Since many base stations will be installed, it is necessary to make the equipment compact, lightweight and simple. In the optical transmission system used in this communication system, generally, an electrical / optical conversion element such as a laser diode,
A light intensity modulation / light intensity detection method using an optical / electrical conversion element such as an optical fiber transmission line and a photodiode is used.
【0004】また光伝送システムの構成として、送信端
局側で搬送波信号と情報信号を含む中間周波信号から生
成した無線周波信号を光リンクで送信装置(アンテナ)
側へ伝送するリンク構成(Central Data
Mixing)と、送信端局側から搬送波信号と中間周
波信号を光リンクで送信装置(アンテナ)側へ伝送し送
信装置側で無線周波信号を生成するリンク構成(Rem
ote Data Mixing)が提案されており、
それぞれ適用が検討されている。As a configuration of an optical transmission system, a transmitting device (antenna) transmits a radio frequency signal generated from an intermediate frequency signal including a carrier signal and an information signal on the transmitting terminal side by an optical link.
Link configuration (Central Data)
Mixing), and a link configuration (Rem) in which a carrier signal and an intermediate frequency signal are transmitted from the transmitting terminal station side to the transmitting device (antenna) side via an optical link and a radio frequency signal is generated on the transmitting device side.
ote Data Mixing) has been proposed,
Each is being considered for application.
【0005】図3は、前記従来のRemote Dat
a Mixing型の無線信号用光伝送システムで、A
は送信端局、Bは送信装置(アンテナ)、a,bは光フ
ァイバ伝送線路、1,2はレーザダイオードモジュール
を含む電気・光変換回路、3は中間周波帯変調器、4は
搬送波信号源、5,6はフォトダイオードモジュールを
含む光・電気変換回路、7は周波数混合器、8はバンド
パスフィルタ、9は送信用アンテナ放射器である。FIG. 3 shows the conventional Remote Dat.
a Mixing type optical transmission system for wireless signals,
Is a transmitting terminal station, B is a transmitting device (antenna), a and b are optical fiber transmission lines, 1 and 2 are electrical / optical conversion circuits including a laser diode module, 3 is an intermediate frequency band modulator, and 4 is a carrier signal source. , 5 and 6 are optical / electrical conversion circuits including a photodiode module, 7 is a frequency mixer, 8 is a bandpass filter, and 9 is a transmitting antenna radiator.
【0006】以上の構成で、レーザダイオードモジュー
ル1,光ファイバ伝送線路a,フォトダイオード5から
構成される光伝送リンクαは中間周波信号用であり、レ
ーザダイオードモジュール2,光ファイバ伝送線路b,
フォトダイオードモジュール6から構成される光伝送リ
ンクβは搬送波信号用である。With the above configuration, the optical transmission link α composed of the laser diode module 1, the optical fiber transmission line a, and the photodiode 5 is for intermediate frequency signals, and the laser diode module 2, the optical fiber transmission line b,
The optical transmission link β composed of the photodiode module 6 is for carrier signals.
【0007】送信端局A内の搬送波信号源4からは周波
数foの搬送波信号Soが出力され、レーザダイオード
モジュール2でこの搬送波信号Soで強度を変調された
光信号が光ファイバbに送出される。この光強度変調光
信号Loは、送信装置B(アンテナ)内のフォトダイオ
ードモジュール6にて周波数foの搬送波信号So′に
復調され、周波数混合器7に送出される。A carrier signal source 4 having a frequency fo is output from a carrier signal source 4 in the transmitting terminal station A, and an optical signal whose intensity is modulated by the carrier signal So in the laser diode module 2 is sent to an optical fiber b. .. This light intensity modulated optical signal Lo is demodulated by the photodiode module 6 in the transmitter B (antenna) into the carrier signal So ′ having the frequency fo, and sent to the frequency mixer 7.
【0008】同様にして、フォトダイオードモジュール
5で周波数f1の中間周波信号S1′が復調され、周波
数混合器7に送出される。周波数混合器7では、搬送波
信号Soの周波数foと中間周波信号S1の周波数f1
からfo+f1およびfo−f1を含む二波の混合信号
S2が生成され、バンドパスフィルタ8で所望の無線周
波信号S3を濾波し、送信用アンテナ放射器9より電波
として放射する。Similarly, the intermediate frequency signal S1 'of frequency f1 is demodulated by the photodiode module 5 and sent to the frequency mixer 7. In the frequency mixer 7, the frequency fo of the carrier signal So and the frequency f1 of the intermediate frequency signal S1.
From, a two-wave mixed signal S2 including fo + f1 and fo-f1 is generated, a desired radio frequency signal S3 is filtered by the band pass filter 8, and radiated as a radio wave from the transmitting antenna radiator 9.
【0009】[0009]
【発明が解決しようとする課題】ところが、図3に示す
無線信号用光伝送システムでは、送信装置(アンテナ)
B側で二個のフォトダイオードモジュール5,6及び一
個の周波数混合器7を必要とするうえ、光インタフェー
スを二個必要とする。このことは、送信装置Bを小型・
軽量化する必要のある移動通信システムにおいては不利
である。こゝにおいて、本発明は、前記従来の技術の課
題に鑑み、送信装置側に設けられる構成部品及び光イン
タフェースを簡略化する無線信号用光伝送システムを提
供することにある。However, in the optical transmission system for radio signals shown in FIG. 3, the transmitter (antenna) is used.
On the B side, two photodiode modules 5 and 6 and one frequency mixer 7 are required, and two optical interfaces are required. This means that the transmitter B is small and
This is disadvantageous in a mobile communication system that needs to be lightweight. In view of the above problems of the conventional technique, the present invention is to provide an optical transmission system for wireless signals, which simplifies the components and optical interface provided on the transmitter side.
【0010】[0010]
【課題を解決するための手段】前記従来技術の課題の解
決は、本発明が次に列挙する新規な特徴的構成手段を採
用することにより達成される。即ち、本発明の第1の特
徴は、送信端局と、当該送信端局から所定の距離だけ離
れて設けられた無線信号送信装置と、これ等の送信端局
と送信装置とを接続する無線信号用光伝送線路から構成
される無線通信システムであって、前記送信端局は、搬
送波信号出力手段と、当該搬送波出力手段からの搬送波
信号で光強度を変調し第一の光伝送線路に出力する第一
の電気・光変換手段と、情報信号を含む中間周波信号出
力手段と、当該中間周波信号出力手段からの中間周波信
号で光強度を変調し第二の光伝送線路に出力する第二の
電気・光変換手段と前記第一及び第二の光伝送線路から
の光信号を結合し前記無線信号用光伝送線路に出力する
光結合手段を備えてなる無線信号用光伝送システムであ
る。The above-mentioned problems of the prior art can be solved by the present invention by adopting the novel characteristic construction means listed below. That is, the first feature of the present invention is that a transmitting terminal station, a radio signal transmitting device provided at a predetermined distance from the transmitting terminal station, and a radio connecting these transmitting terminal station and the transmitting device. A wireless communication system comprising a signal optical transmission line, wherein the transmitting terminal station modulates light intensity with a carrier signal output means and a carrier signal from the carrier output means and outputs the modulated light intensity to a first optical transmission line. A first electric / optical conversion means, an intermediate frequency signal output means including an information signal, and an intermediate frequency signal from the intermediate frequency signal output means for modulating the light intensity and outputting the second optical transmission line to the second optical transmission line. The optical transmission system for wireless signals, comprising: the electrical / optical conversion means and the optical coupling means for coupling the optical signals from the first and second optical transmission lines and outputting the optical signals to the optical transmission line for wireless signals.
【0011】本発明の第2の特徴は、前記第1の特徴に
おける無線信号送信装置が、バイアス電圧により光・電
気変換特性が変化する非線形の光・電気変換特性を有し
て前記第三の光伝送線路を介して伝送された光強度変調
信号を電気信号に変換する光・電気変換手段と、前記光
・電気変換手段より出力される前記搬送波信号、中間周
波信号及びこれらの周波数混合波のうち予め決められた
1つの無線周波成分を濾波する濾波手段と、前記濾波手
段によって濾波された無線周波信号を無線送信する送信
手段とを備えてなる無線信号用光伝送システムである。A second feature of the present invention is that the wireless signal transmitting device according to the first feature has a non-linear optical-electrical conversion characteristic in which the optical-electrical conversion characteristic is changed by a bias voltage. An optical / electrical converting means for converting a light intensity modulated signal transmitted through an optical transmission line into an electric signal, and the carrier wave signal, the intermediate frequency signal and a frequency mixed wave of these outputted from the optical / electrical converting means. An optical transmission system for a radio signal, comprising: a filtering means for filtering one predetermined radio frequency component, and a transmitting means for wirelessly transmitting the radio frequency signal filtered by the filtering means.
【0012】[0012]
【作用】本発明は、前記のような手段を講じるので、光
結合器により、第一の電気・光変換手段と第二の電気・
光変換手段とのそれぞれより送出されてくる光信号を予
め送信端局内で光結合手段により結合して送信装置への
伝送路へ送出するので、光インターフェースは1つで済
み、送信装置側の機器構成も簡略化される。In the present invention, since the above-mentioned means are taken, the first electric / optical converting means and the second electric / optical converting means are connected by the optical coupler.
Since the optical signals sent from the optical conversion means and the optical conversion means are combined in advance by the optical coupling means in the transmission terminal station and sent to the transmission path to the transmission device, only one optical interface is required, and the equipment on the transmission device side is required. The configuration is also simplified.
【0013】[0013]
【実施例】以下、本発明の実施例を図面につき説明す
る。図1は本実施例の無線信号用光伝送システムの全体
構成を示すブロックダイアグラム、図2は図1中の光・
電気変換回路の構成を示す回路図である。図中、A′は
送信端局、B′は送信装置(アンテナ)、cは光ファイ
バ伝送線路、d,eは光ファイバである。Embodiments of the present invention will now be described with reference to the drawings. FIG. 1 is a block diagram showing the overall configuration of the optical transmission system for wireless signals of this embodiment, and FIG.
It is a circuit diagram which shows the structure of an electrical conversion circuit. In the figure, A'is a transmitting terminal station, B'is a transmitting device (antenna), c is an optical fiber transmission line, and d and e are optical fibers.
【0014】1′,2′はレーザダイオードモジュール
を含む電気・光変換回路、9′はアンテナ放射素子、1
0は光結合器、11はアバランシェフォトダイオードモ
ジュールを含む光・電気変換回路、11aはアバランシ
ェフォトダイオードモジュール、11bは負荷、11c
はバイアス電源、11dはバイアス回路である。なお、
前記従来例と同一素子には同一符号を付した。Reference numerals 1'and 2'represent an electrical / optical conversion circuit including a laser diode module, 9'an antenna radiating element, 1 '
0 is an optical coupler, 11 is an optical-electrical conversion circuit including an avalanche photodiode module, 11a is an avalanche photodiode module, 11b is a load, and 11c.
Is a bias power supply, and 11d is a bias circuit. In addition,
The same elements as those in the conventional example are designated by the same reference numerals.
【0015】本実施例の仕様はこのような具体的実施態
様を呈するので、次に、本実施例の動作を図面につき説
明する。レーザダイオードモジュール1′は中間周波信
号Sbで強度変調された光信号Lbを光ファイバdに送
出し、レーザダイオードモジュール2′は搬送波信号S
aで強度変調された光信号Laを光ファイバeに送出す
る。光結合器10では光ファイバdより入力される光信
号Lbと光ファイバeより入力される光信号Laを結合
し、光ファイバ伝送線路cに送出する。Since the specifications of the present embodiment present such a concrete embodiment, the operation of the present embodiment will be described with reference to the drawings. The laser diode module 1'sends the optical signal Lb intensity-modulated with the intermediate frequency signal Sb to the optical fiber d, and the laser diode module 2'has a carrier signal S.
The optical signal La intensity-modulated by a is sent to the optical fiber e. In the optical coupler 10, the optical signal Lb input from the optical fiber d and the optical signal La input from the optical fiber e are combined and sent to the optical fiber transmission line c.
【0016】したがって光ファイバ伝送線路cの中を、
搬送波信号Saで強度変調された光信号Lbと中間周波
信号Saで強度変調された光信号Laが混合信号Lcと
して伝送され、光・電気変換回路11のアバランシェフ
ォトダイオードモジュール11aに出力される。Therefore, in the optical fiber transmission line c,
The optical signal Lb intensity-modulated by the carrier signal Sa and the optical signal La intensity-modulated by the intermediate frequency signal Sa are transmitted as a mixed signal Lc and output to the avalanche photodiode module 11a of the optical / electrical conversion circuit 11.
【0017】アバランシェフォトダイオードモジュール
11aには、バイアス回路11dを介してバイアス電源
11cより定電圧Vが供給されるが、負荷11bにより
電圧降下i×Rが生じる(i:光電流、R:抵抗値)の
で、実効的にはV−i×Rの電圧が印加される。ここで
iは混合信号Lcの入力光強度に比例する値であるが、
図1の場合は搬送波信号Saと中間周波信号Sbを含
む。ここでアバランシェフォトダイオードモジュール1
1aは、印加されるバイアス電圧でその光電流増倍係数
が変化する。The avalanche photodiode module 11a is supplied with a constant voltage V from a bias power supply 11c via a bias circuit 11d, but a load 11b causes a voltage drop i × R (i: photocurrent, R: resistance value). ), The voltage of V−i × R is effectively applied. Here, i is a value proportional to the input light intensity of the mixed signal Lc,
In the case of FIG. 1, the carrier signal Sa and the intermediate frequency signal Sb are included. Here, avalanche photodiode module 1
1a is a bias voltage applied, and its photocurrent multiplication coefficient changes.
【0018】したがって、バイアス電源11cより定電
圧が供給されているもののアバランシェフォトダイオー
ドモジュール11aにおける光・電気変換特性は非線形
となり、電気信号として搬送波信号Saと中間周波信号
Sbのほかこの二波の周波数混合の結果生成されるfo
+f1,fo−f1,等の信号成分の混合信号Scを出
力する。したがって所望の無線周波信号Sdを、バンド
パスフィルタ20で濾波し、送信用アンテナ放射器9′
より電波として放射することができる。Therefore, although the constant voltage is supplied from the bias power source 11c, the optical-electrical conversion characteristic of the avalanche photodiode module 11a becomes non-linear, and the carrier wave signal Sa and the intermediate frequency signal Sb as electric signals and the frequencies of these two waves are generated. Fo generated as a result of mixing
The mixed signal Sc of the signal components of + f1, fo-f1, etc. is output. Therefore, the desired radio frequency signal Sd is filtered by the bandpass filter 20, and the transmitting antenna radiator 9'is provided.
More radio waves can be emitted.
【0019】なお、本発明において、光・電気変換素子
としてアバランシェフォトダイオードを用いているが、
これに限らず、バイアス電圧の微小変化により光・電気
変換特性の変化する非線形性を有する他の光・電気変換
素子(フォトダイオードなど)を用いてもよい。また、
本発明においては、送信端局では光ファイバd,eを用
いているが、これに限らず他の光線路例えば光導波路等
を用いてもよい。In the present invention, an avalanche photodiode is used as the photoelectric conversion element,
The present invention is not limited to this, and other opto-electrical conversion elements (photodiodes or the like) having nonlinearity in which the opto-electrical conversion characteristics change due to a slight change in bias voltage may be used. Also,
In the present invention, the optical fibers d and e are used in the transmitting terminal station, but the present invention is not limited to this, and other optical lines such as an optical waveguide may be used.
【0020】[0020]
【発明の効果】以上のように、本発明によれば、送信端
局より搬送波信号と中間周波信号を別々に光ファイバ伝
送リンクを用いて伝送し送信装置(アンテナ)側でこれ
らの信号を周波数混合し無線周波信号を生成する場合
に、従来例では送信装置側で二個の光・電気変換器と一
個の周波数混合器が必要であったのを一個の光・電気変
換器でこれら三個の素子と同じ機能を果たし、同時に従
来光インタフェースが2であったのを1にすることがで
きる。これにより、送信装置側の電気回路及び光ファイ
バインタフェースが簡略化され、送信側装置を従来より
も小型・軽量化することが可能となる等優れた効果を奏
する。As described above, according to the present invention, the carrier signal and the intermediate frequency signal are separately transmitted from the transmitting end station by using the optical fiber transmission link, and these signals are transmitted by the transmitting device (antenna) side. In the case of mixing and generating a radio frequency signal, in the conventional example, two optical-electrical converters and one frequency mixer were required on the transmitter side. It can perform the same function as the device of (1), and at the same time, can change the conventional optical interface from "2" to "1". This simplifies the electric circuit and the optical fiber interface on the transmitting device side, and has the excellent effect that the transmitting device can be made smaller and lighter than conventional ones.
【図1】本発明の実施例の無線信号用光伝送システムの
構成を示す図である。FIG. 1 is a diagram showing a configuration of an optical transmission system for wireless signals according to an embodiment of the present invention.
【図2】同上、光・電気変換回路の構成図である。FIG. 2 is a configuration diagram of an optical / electrical conversion circuit of the same.
【図3】従来の無線信号用光伝送システムの構成図であ
る。FIG. 3 is a configuration diagram of a conventional optical transmission system for wireless signals.
A,A′…送信端局 B,B′…送信装置(アンテナ) a,b,c…光ファイバ伝送線路 d,e…光ファイバ 1,1′,2,2′…電気・光変換回路 3…中間周波帯変調器 4…搬送波信号源 5,6,11…光・電気変換回路 7…周波数混合器 8…バンドパスフィルタ 9…送信用アンテナ放射器 9′…送信用アンテナ素子 10…光結合器 11a…アバランシェフォトダイオードモジュール 11b…負荷 11c…バイアス電源 11d…バイアス回路 So,So′,Sa…搬送波信号 S1,S1′,Sb…中間周波信号 S2,Sc,Lc…混合信号 S3,Sd…無線周波信号 Lo,La…光強度変調光信号 L1,Lb…中間周波光信号 A, A '... Transmission terminal station B, B' ... Transmission device (antenna) a, b, c ... Optical fiber transmission line d, e ... Optical fiber 1, 1 ', 2, 2' ... Electric / optical conversion circuit 3 ... Intermediate frequency band modulator 4 ... Carrier signal source 5,6,11 ... Optical / electrical conversion circuit 7 ... Frequency mixer 8 ... Bandpass filter 9 ... Transmission antenna radiator 9 '... Transmission antenna element 10 ... Optical coupling Device 11a ... Avalanche photodiode module 11b ... Load 11c ... Bias power supply 11d ... Bias circuit So, So ', Sa ... Carrier wave signal S1, S1', Sb ... Intermediate frequency signal S2, Sc, Lc ... Mixed signal S3, Sd ... Radio Frequency signal Lo, La ... Optical intensity modulation optical signal L1, Lb ... Intermediate frequency optical signal
Claims (2)
だけ離れて設けられた無線信号送信装置と、これ等の送
信端局と送信装置とを接続する無線信号用光伝送線路か
ら構成される無線通信システムであって、 前記送信端局は、搬送波信号出力手段と、当該搬送波出
力手段からの搬送波信号で光強度を変調し第一の光伝送
線路に出力する第一の電気・光変換手段と、情報信号を
含む中間周波信号出力手段と、当該中間周波信号出力手
段からの中間周波信号で光強度を変調し第二の光伝送線
路に出力する第二の電気・光変換手段と、前記第一及び
第二の光伝送線路からの光信号を結合し前記無線信号用
光伝送線路に出力する光結合手段とを備えたことを特徴
とする無線信号用光伝送システム1. A transmission terminal station, a radio signal transmission device provided at a predetermined distance from the transmission terminal station, and a radio signal optical transmission line connecting the transmission terminal station and the transmission device. In the wireless communication system configured, the transmitting terminal station includes a carrier signal output means and a first electrical / electrical device that modulates light intensity with a carrier signal from the carrier output means and outputs the modulated light intensity to a first optical transmission line. Optical conversion means, intermediate frequency signal output means including information signal, and second electric-optical conversion means for modulating the light intensity with the intermediate frequency signal from the intermediate frequency signal output means and outputting the modulated light intensity to the second optical transmission line. And an optical coupling means for coupling the optical signals from the first and second optical transmission lines and outputting the optical signals to the optical transmission line for wireless signals.
光・電気変換特性が変化する非線形の光・電気変換特性
を有して無線信号用光伝送線路を介して伝送された光強
度変調信号を電気信号に変換する光・電気変換手段と、
当該光・電気変換手段より出力される前記搬送波信号、
中間周波信号及びこれらの周波数混合波のうち予め決め
られた1つの無線周波成分を濾波する濾波手段と、当該
濾波手段によって濾波された無線周波信号を無線送信す
る送信手段とを備えたことを特徴とする請求項1記載の
無線信号用光伝送システム2. A wireless signal transmitting apparatus transmits an optical intensity modulation signal transmitted through an optical transmission line for wireless signals, which has a nonlinear optical-electrical conversion characteristic in which an optical-electrical conversion characteristic is changed by a bias voltage. Optical-electrical conversion means for converting into an electric signal,
The carrier wave signal output from the optical-electrical converting means,
A filtering means for filtering a predetermined one of the radio frequency components of the intermediate frequency signal and these frequency mixed waves; and a transmitting means for wirelessly transmitting the radio frequency signal filtered by the filtering means. The optical transmission system for wireless signals according to claim 1.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4053699A JPH05260018A (en) | 1992-03-12 | 1992-03-12 | Optical transmission system for radio signal |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4053699A JPH05260018A (en) | 1992-03-12 | 1992-03-12 | Optical transmission system for radio signal |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH05260018A true JPH05260018A (en) | 1993-10-08 |
Family
ID=12950068
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP4053699A Pending JPH05260018A (en) | 1992-03-12 | 1992-03-12 | Optical transmission system for radio signal |
Country Status (1)
Country | Link |
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JP (1) | JPH05260018A (en) |
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