JP2006352244A - Optical receiver for joint reception system - Google Patents

Optical receiver for joint reception system Download PDF

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JP2006352244A
JP2006352244A JP2005172411A JP2005172411A JP2006352244A JP 2006352244 A JP2006352244 A JP 2006352244A JP 2005172411 A JP2005172411 A JP 2005172411A JP 2005172411 A JP2005172411 A JP 2005172411A JP 2006352244 A JP2006352244 A JP 2006352244A
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optical
amplifier
reception system
input side
joint reception
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JP4616085B2 (en
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Tomoaki Matsushita
智昭 松下
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DX Antenna Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To alter a joint reception system such that an optical signal can be received without altering an existing joint reception system significantly. <P>SOLUTION: A joint reception system 1 transmits an electric signal which can be received by a television receiver to a plurality of terminals, respectively. The joint reception system 1 includes, on the input side thereof, an amplifier 2 for amplifying the electric signal. The amplifier 2 is arranged to receive the electric signal on the input side thereof and to output a DC current from the input side. An optical signal modulated with the electric signal is transmitted to an optical receiver 26 through an optical fiber 30. The optical receiver 26 converts the optical signal into the electric signal through an optoelectronic converter 34 and transmits the electric signal to the input side of the amplifier 2 through a coaxial cable 24. The optical receiver 26 further comprises a DC power supply 38 for operating the optoelectronic converter 34, based on a DC current transmitted from the input side of the amplifier 2 through the coaxial cable 24. The optical receiver 26 is arranged in the vicinity of the amplifier 2. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、共同受信システムにおいて、伝送された光信号を電気信号に変換する光受信機に関する。   The present invention relates to an optical receiver that converts a transmitted optical signal into an electrical signal in a joint reception system.

共同受信システムでは、光伝送路を伝送された光信号を電気信号に変換して、共同受信システムの各端末に伝送することが行われている。そのため、共同受信システムでは、例えば特許文献１に示されているような光受信機が使用されている。   In a joint reception system, an optical signal transmitted through an optical transmission path is converted into an electric signal and transmitted to each terminal of the joint reception system. For this reason, in the joint reception system, for example, an optical receiver as shown in Patent Document 1 is used.

特許文献１の光受信機では、光伝送路を伝送された光信号を光−電気変換器によって電気信号に変換する。この電気信号は、増幅器によって増幅され、レベル調整回路によってチルト特性の調整及び利得調整が行われ、その後に別の増幅器によって増幅が行われて、同軸ケーブルを介して各端末に向けて伝送される。この光受信機は、共同受信システムの入力側に設置される。   In the optical receiver of Patent Document 1, an optical signal transmitted through an optical transmission line is converted into an electrical signal by an optical-electrical converter. This electric signal is amplified by an amplifier, the tilt characteristic is adjusted and the gain is adjusted by a level adjustment circuit, and then amplified by another amplifier and transmitted to each terminal via a coaxial cable. . This optical receiver is installed on the input side of the joint reception system.

特開２０００−２９５５９０号公報JP 2000-295590 A

上記の光受信機では、光信号から電気信号への変換が行われた後、その電気信号の増幅が行われている。ところで、電気信号を伝送するように構成されている既存の共同受信システムにおいて、その入力信号が電気信号から光信号に変更されることがある。この場合、既存の共同受信システムの入力側にある増幅器を、上述したような光受信機に変更する必要がある。この変更は、既存の増幅器を取り外し、新たに光受信機に取り替える工事が必要であり、コストの増大を招く。   In the above optical receiver, after conversion from an optical signal to an electrical signal, the electrical signal is amplified. Incidentally, in an existing joint reception system configured to transmit an electric signal, the input signal may be changed from an electric signal to an optical signal. In this case, it is necessary to change the amplifier on the input side of the existing joint reception system to the optical receiver as described above. This change requires a work for removing an existing amplifier and replacing it with an optical receiver, resulting in an increase in cost.

本発明は、既存の共同受信システムに大幅な変更を加えることなく、光信号を受信することができるように共同受信システムを変更することが可能な光受信機を提供することを目的とする。   An object of the present invention is to provide an optical receiver capable of changing a joint reception system so that an optical signal can be received without significantly changing the existing joint reception system.

本発明の一態様の光受信機は、共同受信システムに使用される。この共同受信システムは、テレビジョン受信機において受信可能な電気信号を、複数の端末それぞれに伝送する。この共同受信システムは、入力側に前記電気信号を増幅する増幅器を備えている。この増幅器は、その入力側に前記電気信号が供給されると共に、前記入力側から直流電流を出力可能に構成されている。この増幅器自身が直流電流の供給手段を備えることもあるし、外部に設けられた直流電流供給手段からの直流電流を、増幅器の入力側から出力するものであることもある。光受信機は、光−電気変換手段を有し、これには、前記電気信号で変調された光信号が光伝送線路を介して伝送される。光−電気変換手段は、前記光信号を前記電気信号に変換して、前記増幅器の入力側に電気伝送線路を介して供給する。直流電源手段が、前記電気伝送線路を介して前記増幅器の入力側から伝送された直流電流に基づいて前記変換手段を作動させる。前記光−電気変換手段及び前記直流電源手段が、前記増幅器の近傍に配置されている。   The optical receiver of one embodiment of the present invention is used in a joint reception system. This joint reception system transmits an electric signal receivable by a television receiver to each of a plurality of terminals. This collective reception system includes an amplifier that amplifies the electric signal on the input side. The amplifier is configured such that the electric signal is supplied to the input side and a direct current can be output from the input side. The amplifier itself may be provided with a direct current supply means, or it may output a direct current from an external direct current supply means provided from the input side of the amplifier. The optical receiver has an optical-electrical conversion means, to which an optical signal modulated with the electrical signal is transmitted via an optical transmission line. The photoelectric conversion means converts the optical signal into the electrical signal, and supplies it to the input side of the amplifier via an electrical transmission line. DC power supply means actuates the conversion means based on a DC current transmitted from the input side of the amplifier via the electric transmission line. The photoelectric conversion means and the DC power supply means are arranged in the vicinity of the amplifier.

このように構成された光受信機では、光−電気変換手段によって光信号を電気信号に変換して、共同受信システムの入力側にある増幅器に供給している。従って、既存の共同受信システムの構成を変更する必要がない。しかも、この光受信機を作動させるための直流電流は、共同受信システムの入力側の増幅器から電気信号伝送線路を介して供給されるので、光−電気変換手段を作動させるための電源を別個に設ける必要はない。共同受信システムの入力側の増幅器は、例えば衛星放送や衛星通信受信用のアンテナが備えるコンバータの動作用に、当該増幅器の入力側から直流電流を送出するように構成されていることが多いので、共同受信システムの入力側の増幅器には、変更を加える必要がない。   In the optical receiver configured as described above, an optical signal is converted into an electric signal by an optical-electric conversion means and supplied to an amplifier on the input side of the joint reception system. Therefore, it is not necessary to change the configuration of the existing joint reception system. In addition, since the direct current for operating the optical receiver is supplied from the amplifier on the input side of the common reception system via the electric signal transmission line, a power source for operating the optical-electric conversion means is separately provided. There is no need to provide it. The amplifier on the input side of the joint reception system is often configured to send a direct current from the input side of the amplifier, for example, for the operation of the converter provided in the antenna for satellite broadcasting or satellite communication reception. There is no need to change the amplifier on the input side of the joint reception system.

上記の光受信機では、前記光−電気変換手段と、前記直流電源手段とを、１つの筐体に収容することができる。１つの筐体に直流電源手段と光−電気変換手段とを収めることにより、この光受信機の設置も容易になる。この筐体は、前記共同受信システムの入力側の増幅器の筐体と同じ高さ及び奥行き寸法を持つものとすることが望ましい。このようにサイズを揃えると、前記増幅器と前記光受信機とを並べて配置した場合、美観を損なうことがないし、設置も容易に行える。   In the above optical receiver, the photoelectric conversion means and the DC power supply means can be accommodated in a single casing. By installing the DC power supply means and the optical-electrical conversion means in one casing, the installation of the optical receiver can be facilitated. This casing preferably has the same height and depth dimensions as the amplifier casing on the input side of the joint reception system. If the sizes are made uniform in this way, when the amplifier and the optical receiver are arranged side by side, the aesthetic appearance is not impaired and the installation can be performed easily.

以上のように、本発明による光受信機を使用すれば、既存の共同受信システムに大幅な変更を加えることなく、光信号を受信することができるように共同受信システムを変更することが可能になる。   As described above, when the optical receiver according to the present invention is used, it is possible to change the joint reception system so that the optical signal can be received without significantly changing the existing joint reception system. Become.

本発明の一実施形態の光受信機は、図１に示すような共同受信システム１において使用される。この共同受信システム１は、例えばマンション等の１つの棟内に敷設されたもので、その入力側に増幅器２を有している。この増幅器２の出力側が分配手段、例えば４分配器４に接続されている。この４分配器４の４つの分配端子には、電気伝送線路、例えば同軸ケーブルからなる幹線６ａ、６ｂ、６ｃ、６ｄが接続されている。これら幹線６ａ乃至６ｄ中には、それぞれ分岐手段、例えば２分岐器８が設けられている。これら２分岐器８には、端末、例えばテレビジョン受信機（図示せず）が接続される。各幹線６ａ、６ｂ、６ｃ、６ｄの中途には、それぞれ中継用増幅器１０がそれぞれ設けられている。なお、共同受信システム１の構成は、図１に示すもの以外にも多種のものがあり、例えば双方向の共同受信システムもある。   An optical receiver according to an embodiment of the present invention is used in a joint reception system 1 as shown in FIG. This joint reception system 1 is laid in one building such as an apartment, and has an amplifier 2 on the input side thereof. The output side of the amplifier 2 is connected to distribution means, for example, a four distributor 4. The four distribution terminals of the four distributor 4 are connected to trunk lines 6a, 6b, 6c, 6d made of electrical transmission lines, for example, coaxial cables. Each of the trunk lines 6a to 6d is provided with a branching unit, for example, a two-branch unit 8. A terminal, for example, a television receiver (not shown) is connected to these two branching devices 8. Relay amplifiers 10 are respectively provided in the middle of the trunk lines 6a, 6b, 6c, and 6d. Note that there are various configurations of the joint reception system 1 other than those shown in FIG. 1, for example, there is a bidirectional joint reception system.

この共同受信システム１の入力側の増幅器２は、図２に示すように、入力端子１２に供給された電気信号、例えばテレビジョン受信機で受信可能な高周波信号を増幅する増幅段１４を有している。実際には、高周波信号は、ＵＨＦ帯のアナログテレビジョン放送信号、ＶＨＦ帯のアナログテレビジョン放送信号、ＶＨＦ帯の地上デジタルテレビジョン放送信号、ＧＨｚ帯の衛星放送中間周波信号等の種々のものがあり、ＵＨＦ帯のアナログテレビジョン放送信号、ＶＨＦ帯のアナログテレビジョン放送信号、ＶＨＦ帯の地上デジタルテレビジョン放送信号用の増幅段と、ＧＨｚ帯の衛星放送中間周波信号用の増幅段とが設けられ、これらはそれぞれ複数段にわたり、縦続接続されている。また、これら複数段の増幅段の前または間には周波数特性を調整するためのイコライザやチルト特性調整回路、利得調整回路等が設けられているが、図２では、これらを省略し、１台の増幅段１４のみを示している。なお、増幅器２には、上記複数段の増幅段及び上記調整回路等で増幅調整された電気信号を出力する出力端子２１が設けられている。   As shown in FIG. 2, the amplifier 2 on the input side of the joint reception system 1 has an amplification stage 14 for amplifying an electric signal supplied to the input terminal 12, for example, a high-frequency signal receivable by a television receiver. ing. Actually, various high frequency signals include UHF band analog television broadcast signals, VHF band analog television broadcast signals, VHF band terrestrial digital television broadcast signals, GHz band satellite broadcast intermediate frequency signals, and the like. Amplification stages for UHF band analog television broadcast signals, VHF band analog television broadcast signals, VHF band terrestrial digital television broadcast signals, and GHz band satellite broadcast intermediate frequency signals are provided. These are connected in cascade over a plurality of stages. Further, an equalizer for adjusting the frequency characteristics, a tilt characteristic adjusting circuit, a gain adjusting circuit, and the like are provided before or between the plurality of amplification stages, but these are omitted in FIG. Only the amplification stage 14 is shown. The amplifier 2 is provided with an output terminal 21 for outputting an electric signal amplified and adjusted by the plurality of amplification stages and the adjustment circuit.

この増幅器２には、衛星放送受信用アンテナや衛星通信受信用アンテナに付属するコンバータを駆動するための直流電流供給手段、例えば直流電源１６が設けられている。この直流電源１６からの直流電流は、高周波阻止コイル１８を介して入力端子１２に供給されている。また、入力端子１２と増幅段１４との間には、直流阻止コンデンサ２０が設けられている。なお、この増幅器２は、図３に示すような箱型の筐体２２に収容されている。   The amplifier 2 is provided with a direct current supply means, for example, a direct current power supply 16 for driving a converter attached to the satellite broadcast receiving antenna or the satellite communication receiving antenna. The direct current from the direct current power source 16 is supplied to the input terminal 12 via the high frequency blocking coil 18. A DC blocking capacitor 20 is provided between the input terminal 12 and the amplification stage 14. The amplifier 2 is housed in a box-shaped housing 22 as shown in FIG.

この増幅器２の入力端子１２に、電気伝送線路、例えば同軸ケーブル２４を介して光受信機２６の出力端子２８が接続されている。光受信機２６は、図１に示すように、光伝送線路、例えば光ファイバ３０を介してヘッドエンド３２から伝送された光信号を受ける。なお、ヘッドエンド３２は、図１に示す共同受信システム１以外の共同受信システムに光信号を伝送するように、光ファイバ３０の他にも光ファイバ３０ａ、３０ｂ・・・等を有している。光ファイバ３０からの光信号は、テレビジョン受信機で受信可能な高周波信号で変調されており、図２に示すように、光−電気変換器３４において高周波信号に変換される。この高周波信号は、出力端子２８から同軸ケーブル２４を介して増幅器２に供給される。従って、光受信機２６を設置することによって、既存の共同受信システム１にはなんら変更を加えることなく、光ファイバーによって光信号が伝送されてくる場合に対応することができる。   An output terminal 28 of an optical receiver 26 is connected to the input terminal 12 of the amplifier 2 via an electric transmission line, for example, a coaxial cable 24. As shown in FIG. 1, the optical receiver 26 receives an optical signal transmitted from a head end 32 via an optical transmission line, for example, an optical fiber 30. The head end 32 includes optical fibers 30a, 30b, etc. in addition to the optical fiber 30 so as to transmit an optical signal to a joint reception system other than the joint reception system 1 shown in FIG. . The optical signal from the optical fiber 30 is modulated by a high-frequency signal that can be received by a television receiver, and is converted into a high-frequency signal by an opto-electric converter 34 as shown in FIG. This high frequency signal is supplied from the output terminal 28 to the amplifier 2 via the coaxial cable 24. Therefore, by installing the optical receiver 26, it is possible to cope with a case where an optical signal is transmitted by an optical fiber without any change to the existing joint reception system 1.

この光−電気変換器３４を作動させるために直流電流が必要である。この直流電流は、増幅器２が備える直流電源１６から供給される。すなわち、上述したように直流電源１６からの直流電流は、入力端子１２から同軸ケーブル２４に供給可能である。同軸ケーブル２４が接続される光受信機２６の出力端子２８には、高周波阻止コイル３６を介して直流電源３８が接続されている。従って、増幅器２からの直流電流は、出力端子２８から高周波阻止コイル３６を介して直流電源３８に供給される。直流電源３８は、増幅器２からの直流電流を光−電気変換器３４に供給し、これを動作させる。直流電源３８は、供給された直流電流に基づいて発生させる直流電圧の値を光−電気変換器３４に対応した電圧に変換する。なお、直流電流が、光−電気変換器３４の出力側に回り込むことを防止するために、光−電気変換器３４の出力側と出力端子２８との間には直流阻止コンデンサ４０が接続されている。   In order to operate this photoelectric converter 34, a direct current is required. This direct current is supplied from a direct current power supply 16 provided in the amplifier 2. That is, as described above, the DC current from the DC power supply 16 can be supplied from the input terminal 12 to the coaxial cable 24. A DC power supply 38 is connected to the output terminal 28 of the optical receiver 26 to which the coaxial cable 24 is connected via a high frequency blocking coil 36. Accordingly, the direct current from the amplifier 2 is supplied from the output terminal 28 to the direct current power supply 38 via the high frequency blocking coil 36. The direct current power source 38 supplies the direct current from the amplifier 2 to the photoelectric converter 34 and operates it. The DC power supply 38 converts the value of the DC voltage generated based on the supplied DC current into a voltage corresponding to the photoelectric converter 34. A DC blocking capacitor 40 is connected between the output side of the optical-electrical converter 34 and the output terminal 28 in order to prevent a direct current from flowing to the output side of the optical-electrical converter 34. Yes.

この光−電気変換器３４と直流電源３８とは、図３に示すように、１つの筐体４２内に収容されている。この筐体４２は、増幅器２の筐体２２と同じ高さ寸法及び奥行き寸法を持つもので、その幅寸法が筐体２２よりも短く、扁平に構成されている。従って、この光受信機２６を、増幅器２と並べて配置するような場合でも、スイッチ等の操作具が配置される正面パネルをほぼ同じ位置に配置することができ、調整等の作業も容易に行える。また、美観上も好ましい。   The photoelectric converter 34 and the DC power source 38 are accommodated in one housing 42 as shown in FIG. The casing 42 has the same height and depth dimensions as the casing 22 of the amplifier 2, and the width dimension thereof is shorter than that of the casing 22 and is configured to be flat. Therefore, even when the optical receiver 26 is arranged side by side with the amplifier 2, the front panel on which the operation tool such as a switch is arranged can be arranged at substantially the same position, and the work such as adjustment can be easily performed. . In addition, it is also aesthetically preferable.

なお、光受信機２６では、説明の簡略化のため、光−電気変換器３４と直流電源３８とを備えるものとしたが、図４に示す光受信機２６ａのように、光−電気変換器３４からの出力である高周波信号を増幅段４４によって増幅した後、レベル調整器４６によってレベル調整した後、出力端子２８に直流阻止コンデンサ４０を介して供給することもできる。この場合、増幅段４４の作動用の直流電流も直流電源３８から供給される。   The optical receiver 26 is provided with the optical-electrical converter 34 and the DC power supply 38 for the sake of simplicity of explanation. However, like the optical receiver 26a shown in FIG. 4, the optical-electrical converter 26 is provided. It is also possible to amplify the high frequency signal output from 34 by the amplification stage 44, adjust the level by the level adjuster 46, and then supply the output terminal 28 via the DC blocking capacitor 40. In this case, a direct current for operating the amplification stage 44 is also supplied from the direct current power supply 38.

本発明の１実施形態の光受信機が設置される共同受信システムのブロック図である。It is a block diagram of the joint reception system in which the optical receiver of one Embodiment of this invention is installed. 本発明の１実施形態の光受信機と図１の共同受信システムの入力側に設けた増幅器との接続を示すブロック図である。It is a block diagram which shows the connection of the optical receiver of one Embodiment of this invention, and the amplifier provided in the input side of the joint reception system of FIG. 図２の光受信機と入力側増幅器との配置状態を示す斜視図である。FIG. 3 is a perspective view showing an arrangement state of the optical receiver and the input side amplifier of FIG. 2. 本発明の１実施形態の光受信機の変形例を示すブロック図である。It is a block diagram which shows the modification of the optical receiver of one Embodiment of this invention.

符号の説明Explanation of symbols

１ 共同受信システム
２ 入力側の増幅器
２６ 光受信機
３４ 光−電気変換器（光−電気変換手段）
３８ 直流電源（直流電源手段） DESCRIPTION OF SYMBOLS 1 Joint reception system 2 Input side amplifier 26 Optical receiver 34 Optical-electrical converter (optical-electrical conversion means)
38 DC power supply (DC power supply means)

Claims (2)

テレビジョン受信機において受信可能な電気信号を、複数の端末それぞれに伝送し、入力側に前記電気信号を増幅する増幅器を備え、この増幅器は、その入力側に前記電気信号が供給されると共に、前記入力側から直流電流を出力可能に構成された共同受信システムにおいて、
前記電気信号で変調された光信号が光伝送線路を介して伝送され、前記光信号を前記電気信号に変換して、前記増幅器の入力側に電気伝送線路を介して供給する光−電気変換手段と、
前記電気伝送線路を介して前記増幅器の入力側から伝送された直流電流に基づいて前記変換手段を作動させる直流電源手段とを、
具備し、前記変換手段及び前記直流電源手段が、前記増幅器の近傍に配置されている共同受信システム用光受信機。 An electric signal receivable in a television receiver is transmitted to each of a plurality of terminals, and an amplifier for amplifying the electric signal is provided on an input side, and the amplifier is supplied with the electric signal on the input side, In the joint reception system configured to be able to output a direct current from the input side,
Optical-electrical conversion means for transmitting an optical signal modulated with the electrical signal through an optical transmission line, converting the optical signal into the electrical signal, and supplying the converted signal to the input side of the amplifier via the electrical transmission line When,
DC power source means for operating the conversion means based on a DC current transmitted from the input side of the amplifier via the electric transmission line,
An optical receiver for a joint reception system comprising: the conversion means and the DC power supply means arranged in the vicinity of the amplifier. 請求項１記載の共同受信システム用光受信機において、前記光−電気変換手段と、前記直流電源手段とが、１つの筐体に収容されている共同受信システム用光受信機。

2. The optical receiver for a joint reception system according to claim 1, wherein the photoelectric conversion means and the DC power supply means are accommodated in one casing.

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Cited By (1)

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Publication number Priority date Publication date Assignee Title
JP2012033996A (en) * 2010-07-28 2012-02-16 Hochiki Corp Photoelectric conversion plug

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JPH1132317A (en) * 1997-07-14 1999-02-02 Dx Antenna Co Ltd Amplifier for common reception installation
JP2000295590A (en) * 1999-04-09 2000-10-20 Miharu Tsushin Kk Hfc system for cavt system
JP2003224835A (en) * 2002-01-31 2003-08-08 Hitachi Kokusai Electric Inc Trunk line amplifier for catv
JP2004289798A (en) * 2003-03-05 2004-10-14 Maspro Denkoh Corp Bidirectional catv system and branching apparatus
JP2004336185A (en) * 2003-05-01 2004-11-25 Dx Antenna Co Ltd Joint reception system

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JPH1132317A (en) * 1997-07-14 1999-02-02 Dx Antenna Co Ltd Amplifier for common reception installation
JP2000295590A (en) * 1999-04-09 2000-10-20 Miharu Tsushin Kk Hfc system for cavt system
JP2003224835A (en) * 2002-01-31 2003-08-08 Hitachi Kokusai Electric Inc Trunk line amplifier for catv
JP2004289798A (en) * 2003-03-05 2004-10-14 Maspro Denkoh Corp Bidirectional catv system and branching apparatus
JP2004336185A (en) * 2003-05-01 2004-11-25 Dx Antenna Co Ltd Joint reception system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012033996A (en) * 2010-07-28 2012-02-16 Hochiki Corp Photoelectric conversion plug

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