JPH05260018A - Optical transmission system for radio signal - Google Patents

Optical transmission system for radio signal

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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
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Japan
Prior art keywords
signal
optical
means
optical transmission
radio
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JP4053699A
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Japanese (ja)
Inventor
Yoshiaki Kamiya
嘉明 神谷
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Kokusai Denshin Denwa Co Ltd <Kdd>
国際電信電話株式会社
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Priority to JP4053699A priority Critical patent/JPH05260018A/en
Publication of JPH05260018A publication Critical patent/JPH05260018A/en
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Abstract

PURPOSE:To provide an optical transmission system for radio signal which transmits signals to be transferred through a radio channel by using an optical fiber cable. CONSTITUTION:A transmission terminal station A' is provided with a first electric/optic converting means 2' for modulating light intensity with a carrier signal Sa from a carrier signal output means 4 and outputting light to an optical transmission line (e), second electric/optic converting means 1' for modulating light intensity with an intermediate frequency signal f1 from an output means 3 for an intermediate frequency signal Sb including an information signal, and photocoupling means 10 for coupling optical signals La and Lb from optical transmission lines (d) and (e) and outputting the signal to an optical transmission line (c) for radio signal, and a transmitter B' is provided with a filtering means 8 for filtering one radio frequency component among the signals Sa and Sb outputted from an photoelectric converting means 11, which converts a light intensity modulated signal Lc transmitted through the optical transmission line (c) to an electric signal Sc, and waves mixing the frequencies of these signals and transmitting means 9' for transmitting a filtered radio frequency signal Sd.

Description

【発明の詳細な説明】 DETAILED DESCRIPTION OF THE INVENTION

【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。 The present invention relates, when transmitting and receiving terminal station and the radio signal transmission and reception apparatus for performing variable-demodulation of the baseband signal (antenna) are separated, an optical signal for transmitting and receiving via a radio channel a wireless signal optical transmission system for transmitting 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。 In the field of this kind, an optical transmission system for transmitting a radio frequency signal by the intensity of light transmitted through the optical fiber, broadband using optical fibers, taking advantage of the feature that low-loss transmission, conventional has attracted attention as an alternative to electrical signal transmission means such as a coaxial cable, and configuration of the transmission system have 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。 As an example of application of this transmission system, and a number of mobile communication system composed of a small zone wireless area. 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。 This communication system is composed of distribution base stations distribution by a central station and the antenna or the like transmitting apparatus at the transmitting end station. 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。 Since the base station will be installed a number, it is necessary to compact, lightweight, simplified their facilities. 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、 Common in an optical transmission system for use in this communication system, the electrical-optical conversion devices such as a laser diode,
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。 Using the light intensity modulation and the light intensity detection method using an optical-electric conversion element such as an optical fiber transmission line and a photodiode.

【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) [0004] transmitting device in an optical link radio frequency signal generated from the intermediate frequency signal containing the configuration of the optical transmission system, a carrier signal and the information signal at the transmitting end station (antenna)
側へ伝送するリンク構成(Central Data Link configuration to be transmitted to the side (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 And Mixing), the transmission device in an optical link a carrier signal and the intermediate frequency signal from the transmitting terminal station side (antenna) link to generate a radio frequency signal at the transmitting apparatus side transmits to the side structure (Rem
ote Data Mixing)が提案されており、 ote Data Mixing) have been proposed,
それぞれ適用が検討されている。 Apply each has been studied.

【0005】図3は、前記従来のRemote Dat [0005] Figure 3, the conventional Remote Dat
a Mixing型の無線信号用光伝送システムで、A In a Mixing type wireless signal optical transmission system, 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。 The transmitting end station, B is the transmitting apparatus (antenna), a, b is the optical fiber transmission line, electric-optical conversion circuit including a laser diode module 2, 3 is an intermediate frequency band modulator, the carrier signal source 4 , optoelectronic conversion circuit including a photodiode module 5,6, 7 frequency mixer, 8 band pass filter, 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, [0006] In the above configuration, the laser diode module 1, the optical fiber transmission line a, the optical transmission link α consists photodiode 5 is for the intermediate frequency signal, a laser diode module 2, an optical fiber transmission line 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。 The optical transmission link β consists photodiode module 6 is for a carrier signal.

【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。 [0007] Carrier signal So of a frequency fo is output from the carrier signal source 4 in the transmitting terminal A, an optical signal modulated intensity in the laser diode module 2 in this carrier signal So is sent to the optical fiber b . 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。 The light intensity modulation optical signal Lo is demodulated to the carrier signal So 'the frequency fo at the photodiode module 6 provided within the transmitter B (antenna), is 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。 [0008] Similarly, the intermediate frequency signal S1 of frequency f1 by a photodiode module 5 'is demodulated and sent to the frequency mixer 7. 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 The frequency mixer 7, the frequency of the frequency fo and the intermediate frequency signal S1 of the carrier signal So. 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。 Mixing signal S2 second wave including fo + f1 and fo-f1 is generated from a desired radio frequency signal S3 is filtered by the band pass filter 8, it is radiated as radio waves 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) THE INVENTION Problems to be Solved] However, in the radio signal optical transmission system shown in FIG. 3, the transmission device (antenna)
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。 Terms of requiring two photodiodes modules 5, 6 and one of the frequency mixer 7 in the B side, the optical interface between two required. このことは、送信装置Bを小型・ This small and the transmission device B
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。 It is disadvantageous in a mobile communication system that needs to be lightweight. 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。 In this ゝ, the present invention is the light of the problems of the prior art and to provide a light transmission system for radio signals to simplify the components and optical interfaces are provided to 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。 Solving problems of the prior art [Means for Solving the Problems] is achieved by the present invention is then to adopt a novel characteristic configuration means listed. 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。 That is, the first aspect of the present invention, a radio to connect the transmitting terminal station, a radio signal transmitting device provided apart from the transmitting terminal station by a predetermined distance, and a transmission device with which such transmitting end station a wireless communication system composed of signal optical transmission line, the transmitting terminal station, the output carrier wave signal output means, the first optical transmission line by modulating the light intensity in the carrier signal from the carrier wave output unit a first electrical-optical conversion means for the intermediate frequency signal output means including an information signal, the second output to the intermediate frequency signal to modulate the light intensity at the intermediate frequency signal from the output means the second optical transmission line wherein the electro-optical conversion means is a first and second radio signal optical transmission system comprising comprises an optical coupling means for the optical signal combined for output to the wireless signal optical transmission line from the optical transmission line.

【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 aspect of the present invention, a radio signal transmitting device in the first feature, the bias voltage by the light-electricity conversion characteristics nonlinear has a light-electricity conversion characteristics said third varying a light-electricity conversion means for converting the optical intensity-modulated signal transmitted through the optical transmission line into an electrical signal, the carrier wave signal output from the light-electricity conversion means, of intermediate frequency signals and their frequency mixing wave of a filtering means for filtering the predetermined one radio frequency component is a radio signal optical transmission system comprising a transmitting means for wirelessly transmitting a 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・ DETAILED DESCRIPTION OF THE INVENTION The present invention, since the like take measures, by optical coupler, a first electrical-optical converting means second electric-
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。 Since sending in advance the transmitting end station optical signal which is sent from each of the light conversion means is coupled by optical coupling means to the transmission line to the transmission device, the optical interface requires only one transmitter device side device 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。 EXAMPLES Hereinafter, an embodiment of the present invention per drawings. 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・ Figure 1 is a block diagram showing the overall configuration of a radio signal optical transmission system of the present embodiment, the light-in Figure 2 Figure 1
電気変換回路の構成を示す回路図である。 Is a circuit diagram showing the configuration of an electric converter circuit. 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。 In the figure, A 'is transmitting end, B' is transmitting device (antenna), c is the optical fiber transmission line, d, e is an optical fiber.

【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 [0014] 1 ', 2' electro-optical conversion circuit including a laser diode module, 9 'antenna radiating element, 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 0 optical coupler, 11 an optical-electrical conversion circuit including an avalanche photodiode modules, 11a avalanche photodiode modules, 11b are loaded, 11c
はバイアス電源、11dはバイアス回路である。 The bias power supply, 11d denotes a bias circuit. なお、 It should be noted that,
前記従来例と同一素子には同一符号を付した。 Wherein the same reference numerals in the conventional example and the same element.

【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。 [0015] Since the specifications of the present embodiment exhibits such a specific embodiment, description will now be given of an operation of the embodiment DRAWINGS FIG. 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 The laser diode module 1 'sends a light signal Lb which is intensity-modulated by the intermediate frequency signal Sb to the optical fiber d, laser diode module 2' carrier signal 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。 The intensity-modulated optical signal La in a sent to the optical fiber e. 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。 In the optical coupler 10 combines the optical signals La inputted from the optical signal Lb and the optical fiber e input from the optical fiber d, is transmitted 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、 [0016] Thus through the optical fiber transmission line c,
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。 Optical signal Lb and the intermediate frequency signal Sa in intensity modulated optical signal La which is intensity-modulated at a carrier signal Sa is transmitted as a mixed signal Lc, is output to the avalanche photodiode module 11a of the light-electricity 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。 [0017] avalanche photodiode module 11a is a constant voltage V from a bias power source 11c through the bias circuit 11d is supplied, the voltage drop i × R caused by the load 11b (i: photocurrent, R: resistance value ) so the effective voltage V-i × R is applied. 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、 Where i is is a value proportional to the input light intensity of the mixed signals Lc,
図1の場合は搬送波信号Saと中間周波信号Sbを含む。 In the case of FIG. 1 including a carrier signal Sa and an intermediate frequency signal Sb. ここでアバランシェフォトダイオードモジュール1 Here avalanche photodiode module 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。 1a, the photocurrent enhancement factor at the applied bias voltage is changed.

【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 [0018] Thus, the optical and electrical characteristics of the avalanche photodiode module 11a of which the constant voltage is supplied from the bias power supply 11c becomes nonlinear, other frequencies of the second wave of the carrier signal Sa and an intermediate frequency signal Sb as an electric signal fo generated as a result of mixing
+f1,fo−f1,等の信号成分の混合信号Scを出力する。 + F1, fo-f1, and outputs the mixed signal Sc of the signal components and the like. 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′ Desired radio frequency signal Sd Thus, filtering by the band-pass filter 20, transmitting antenna radiator 9 '
より電波として放射することができる。 It can be more radiated as radio waves.

【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、 [0019] In the present invention, it is used an avalanche photodiode as a light-electricity conversion element,
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。 Not limited thereto, (such as a photodiode) other optoelectronic conversion device having a non-linearity of varying optical and electrical characteristics by small change of the bias voltage may be used. また、 Also,
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, the optical fiber d is at the transmitting end station, are used to e, other optical line may be used for example an optical waveguide, etc. it is not limited thereto.

【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。 As is evident from the foregoing description, according to the present invention, the frequency of these signals by the transmission device (antenna) side transmitted using an optical fiber transmission link separately a carrier signal and the intermediate frequency signal from the transmitting terminal station mixing to generate a radio frequency signal, these three from was necessary two optical-electrical converter and one of the frequency mixer in the transmitting apparatus side by a single light-electric converter in the prior art performs the same function as the element, it is possible to simultaneously conventional optical interface to 1 from was 2. 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。 This will simplify the electrical circuits and optical fiber interface of the transmitter side, exhibits an equal excellent effect that the sender apparatus can be smaller and lighter than conventional.

【図面の簡単な説明】 BRIEF DESCRIPTION OF THE DRAWINGS

【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。 1 is a diagram showing a configuration of a radio signal optical transmission system of an embodiment of the present invention.

【図2】同上、光・電気変換回路の構成図である。 [Figure 2] Id is a block diagram of an optical-electrical conversion circuit.

【図3】従来の無線信号用光伝送システムの構成図である。 3 is a block diagram of a conventional radio signal optical transmission system.

【符号の説明】 DESCRIPTION OF SYMBOLS

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 '... transmitting end station B, B' ... transmitting device (antenna) a, b, c ... optical fiber transmission line d, e ... optical fiber 1, 1 ', 2,2' ... electro-optical converter 3 ... intermediate frequency band modulator 4 ... carrier signal source 5, 6, 11 ... light-electricity conversion circuit 7 ... frequency mixer 8 ... band-pass filter 9 ... transmission antenna radiator 9 '... transmitting antenna elements 10 ... optical coupling vessel 11a ... avalanche photodiode module 11b ... load 11c ... bias power supply 11d ... bias circuit So, So ', Sa ... carrier signal S1, S1', Sb ... intermediate frequency signal S2, Sc, Lc ... mixed signal S3, Sd ... radio frequency signal Lo, La ... light intensity-modulated optical signal L1, Lb ... intermediate frequency optical signal

Claims (2)

    【特許請求の範囲】 [The claims]
  1. 【請求項1】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 And 1. A transmitting terminal station, a radio signal transmitting device provided apart from the transmitting terminal station by a predetermined distance, from the radio signal optical transmission line connecting a transmission device and which like the transmitting end station of a configured wireless communication system, the transmitting end station, the carrier signal outputting means, first electrical-to be output to the first optical transmission line by modulating the light intensity in the carrier signal from the carrier wave output unit a light converting member, and the intermediate frequency signal output means including an information signal, the intermediate frequency signal to modulate the light intensity at the intermediate frequency signal from the output means the second electric-optical conversion means for outputting the second optical transmission line When the first and second optical transmission system for a radio signal, comprising the optical coupling means for the optical signal combined for output to the wireless signal optical transmission line from the optical transmission line
  2. 【請求項2】無線信号送信装置は、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、 2. A radio signal transmission apparatus, the optical intensity modulated signal having a non-linear optical-electrical conversion characteristic optical and electrical characteristics are changed is transmitted via a radio signal optical transmission line by the bias voltage a light-electricity conversion means for converting into an electric signal,
    当該光・電気変換手段より出力される前記搬送波信号、 It said carrier signal output from the optical-electrical conversion means,
    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 Features and filtering means for filtering the intermediate frequency signal and one radio-frequency components to a predetermined one of these frequencies mixed wave, that the radio frequency signal filtered by the filtering means and a transmitting means for wireless transmission radio signal optical transmission system according to claim 1,
JP4053699A 1992-03-12 1992-03-12 Optical transmission system for radio signal Pending JPH05260018A (en)

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

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Application Number Priority Date Filing Date Title
JP4053699A JPH05260018A (en) 1992-03-12 1992-03-12 Optical transmission system for radio signal

Publications (1)

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JPH05260018A true JPH05260018A (en) 1993-10-08

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JP4053699A Pending JPH05260018A (en) 1992-03-12 1992-03-12 Optical transmission system for radio signal

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