JP2018033065A - Broadband hybrid community reception system and optical receiver (v-onu) - Google Patents

Broadband hybrid community reception system and optical receiver (v-onu) Download PDF

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JP2018033065A
JP2018033065A JP2016165367A JP2016165367A JP2018033065A JP 2018033065 A JP2018033065 A JP 2018033065A JP 2016165367 A JP2016165367 A JP 2016165367A JP 2016165367 A JP2016165367 A JP 2016165367A JP 2018033065 A JP2018033065 A JP 2018033065A
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JP6706176B2 (en
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将和 西村
Showa Nishimura
将和 西村
松井　隆司
Takashi Matsui
隆司 松井
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DX Antenna Co Ltd
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Abstract

PROBLEM TO BE SOLVED: To provide a broadband hybrid community reception system that can receive a leftward circular polarization signal, has few restrictions on system construction, and is low in difficulty in laying construction.SOLUTION: A broadband hybrid community reception system includes: a first transmission path for transmitting a signal in a frequency band including at least one of an FM band, a UHF band, and a CATV band as an electric signal; an E/O converter 2 for converting from the electric signal into an optical signal regarding a leftward circular polarization signal; a second transmission path for transmitting the optical signal output from the E/O converter 2; an O/E converter 44 for converting the optical signal transmitted by the second transmission path to an electric signal; and a mixer 45 for mixing the electric signal transmitted by the first transmission path with the electric signal output from the O/E converter 44.SELECTED DRAWING: Figure 1

Description

本発明は、広帯域ハイブリッド共同受信システム及び広帯域ハイブリッド共同受信システムのために用いられる光受信機に関する。   The present invention relates to a broadband hybrid joint reception system and an optical receiver used for the broadband hybrid joint reception system.

共同受信システムはビルやマンション等の棟内に敷設される。従来の共同受信システムの一構成例を図６に示す。図６に示す共同受信システムは、混合器１０１と、双方向増幅器１０２と、分配器１０３と、を備える構成である。   The joint reception system is laid in buildings such as buildings and condominiums. An example of the configuration of a conventional joint reception system is shown in FIG. The joint reception system illustrated in FIG. 6 includes a mixer 101, a bidirectional amplifier 102, and a distributor 103.

混合器１０１は、ＢＳ右旋放送及びＣＳ右旋放送を受信する衛星放送アンテナ２０１から出力される信号と、地上放送を受信する地上放送アンテナ２０２から出力される信号又はＣＡＴＶサービスの下り信号と、を混合する。   The mixer 101 includes a signal output from the satellite broadcasting antenna 201 that receives BS right-handed broadcasting and CS right-handed broadcasting, a signal output from the terrestrial broadcasting antenna 202 that receives terrestrial broadcasting, or a downlink signal of a CATV service, Mix.

双方向増幅器１０２は、混合器１０１から出力される電気信号を増幅して分配器１０３に出力する。   The bidirectional amplifier 102 amplifies the electric signal output from the mixer 101 and outputs it to the distributor 103.

分配器１０３は、双方向増幅器１０２から出力される電気信号を分配する。分配器１０３と各住戸との間には、各住戸の配置や住戸数に応じて双方向増幅器や分配器が適宜配置される。   The distributor 103 distributes the electrical signal output from the bidirectional amplifier 102. Between the distributor 103 and each dwelling unit, a bidirectional amplifier and a distributor are appropriately arranged according to the arrangement of each dwelling unit and the number of dwelling units.

また、各住戸に設置され得るパーソナルコンピュータ等の通信機器から出力されるＣＡＴＶサービスの上り信号が、分配器１０３、双方向増幅器１０２、及び混合器１０１を経由してＣＡＴＶ網に伝送される。つまり、図６に示す共同受信システムではＣＡＴＶ網を利用した通信も可能である。   Further, an upstream signal of the CATV service output from a communication device such as a personal computer that can be installed in each dwelling unit is transmitted to the CATV network via the distributor 103, the bidirectional amplifier 102, and the mixer 101. That is, in the joint reception system shown in FIG. 6, communication using the CATV network is also possible.

なお、混合器１０１及び双方向増幅器１０２の代わりに、ＢＳ右旋放送及びＣＳ右旋放送を受信する衛星放送アンテナ２０１から出力される信号を入力する第１の入力端子と、地上放送を受信する地上放送アンテナ２０２から出力される信号又はＣＡＴＶサービスの下り信号を入力する第２の入力端子と、第１及び第２の入力端子に入力された信号を混合して得られる電気信号を出力する出力端子と、を備える双方向増幅器を用いてもよい。   Instead of the mixer 101 and the bi-directional amplifier 102, a first input terminal for inputting a signal output from the satellite broadcast antenna 201 that receives BS right-handed broadcasting and CS right-handed broadcasting, and terrestrial broadcasting are received. An output that outputs an electric signal obtained by mixing a second input terminal that inputs a signal output from the terrestrial broadcasting antenna 202 or a downlink signal of the CATV service, and a signal input to the first and second input terminals. And a bidirectional amplifier including a terminal.

特開２０１１-１０３７０１号公報JP 2011-103701 A

図６に示す共同受信システムは、少なくとも大規模なビルやマンション等の棟内に敷設されるシステムに関して、２０１８年から実用放送が予定されている４Ｋ或いは８Ｋの衛星放送であるＢＳ左旋放送及びＣＳ左旋放送を受信できないという問題を有している。つまり、ＢＳ右旋放送及びＣＳ右旋放送を受信する衛星放送アンテナ２０１を、ＢＳ右旋放送、ＣＳ右旋放送、ＢＳ左旋放送、及びＣＳ左旋放送を受信する衛星放送アンテナに単純に取り換えるだけでは済まない。ＢＳ左旋放送及びＣＳ左旋放送の伝送周波数帯域（２２２４〜２６４３ＭＨｚ及び２７４８〜３２２４ＭＨｚ）が高く、ＢＳ左旋放送及びＣＳ左旋放送の伝送周波数帯域の電気信号の伝送可能距離が短いため、双方向増幅器の段数を増やす必要に迫られる可能性が高くなる。しかしながら、双方向増幅器の段数を増やすと、信号の歪が大きくなってしまうため、双方向増幅器の段数は一般的に３段以内である。このような制約が存在するため、図６に示す共同受信システムは、例えば住戸数が多い場合にＢＳ左旋放送及びＣＳ左旋放送を受信できない。また、例えば住戸数が少なくて図６に示す共同受信システムでＢＳ左旋放送及びＣＳ左旋放送を利用できる場合であっても、図６に示す共同受信システムが既設の設備であれば、ＢＳ左旋放送及びＣＳ左旋放送を受信可能とするために双方向増幅器を追加する大掛かりな改修工事が必要となる。   The joint reception system shown in FIG. 6 is a 4K or 8K satellite broadcast, which is a 4K or 8K satellite broadcast scheduled for practical use from 2018, at least for a system laid in a building such as a large-scale building or condominium. It has a problem that it cannot receive a left-handed broadcast. That is, simply replacing the satellite broadcasting antenna 201 that receives BS right-handed broadcasting and CS right-handed broadcasting with a satellite broadcasting antenna that receives BS right-handed broadcasting, CS right-handed broadcasting, BS left-handed broadcasting, and CS left-handed broadcasting. I'm sorry. The transmission frequency bands (2224 to 2643 MHz and 2748 to 3224 MHz) of BS left-handed broadcasting and CS left-handed broadcasting are high, and the transmission distance of electrical signals in the transmission frequency band of BS left-handed broadcasting and CS left-handed broadcasting is short. There is a high possibility that it will be necessary to increase. However, if the number of stages of the bidirectional amplifier is increased, the distortion of the signal increases. Therefore, the number of stages of the bidirectional amplifier is generally within 3 stages. Because of such restrictions, the joint reception system shown in FIG. 6 cannot receive BS left-handed broadcasting and CS left-handed broadcasting when the number of dwelling units is large, for example. For example, even if the number of dwelling units is small and BS left-handed broadcasting and CS left-handed broadcasting can be used in the joint receiving system shown in FIG. 6, if the joint receiving system shown in FIG. In addition, a large-scale renovation work is required to add a bidirectional amplifier in order to be able to receive CS left-handed broadcasting.

一方、ＢＳ左旋放送及びＣＳ左旋放送の伝送周波数帯域による制約を受けない従来の共同受信システムも存在する（例えば特許文献１参照）。ＢＳ左旋放送及びＣＳ左旋放送の伝送周波数帯域による制約を受けない従来の共同受信システムの一構成例を図７に示す。図７に示す共同受信システムは、混合器３０１と、Ｅ／Ｏ変換器３０２と、光増幅器３０３と、分配器３０４と、を備える構成である。   On the other hand, there is a conventional joint reception system that is not limited by the transmission frequency band of BS left-handed broadcasting and CS left-handed broadcasting (see, for example, Patent Document 1). FIG. 7 shows a configuration example of a conventional joint reception system that is not limited by the transmission frequency band of BS left-handed broadcasting and CS left-handed broadcasting. The collective reception system illustrated in FIG. 7 includes a mixer 301, an E / O converter 302, an optical amplifier 303, and a distributor 304.

混合器３０１は、ＢＳ右旋放送及びＣＳ右旋放送を受信する衛星放送アンテナ２０１から出力される信号と、地上放送を受信する地上放送アンテナ２０２から出力される信号又はＣＡＴＶサービスの下り信号と、を混合する。   The mixer 301 includes a signal output from the satellite broadcasting antenna 201 that receives BS right-handed broadcasting and CS right-handed broadcasting, a signal output from the terrestrial broadcasting antenna 202 that receives terrestrial broadcasting, or a downlink signal of a CATV service, Mix.

Ｅ／Ｏ変換器３０２は、混合器３０１から出力される電気信号を光信号に変換して光増幅器３０３に出力する。   The E / O converter 302 converts the electrical signal output from the mixer 301 into an optical signal and outputs the optical signal to the optical amplifier 303.

光増幅器３０３は、Ｅ／Ｏ変換器３０２から出力される光信号を増幅して分配器３０４に出力する。   The optical amplifier 303 amplifies the optical signal output from the E / O converter 302 and outputs the amplified signal to the distributor 304.

分配器３０４は、光増幅器３０３から出力される光信号を分配する。分配器３０４と各住戸との間には、各住戸の配置や住戸数に応じて分配器が適宜配置される。そして、各住戸にはＶ−ＯＮＵ（Video-Optical Network Unit）が設置される。   The distributor 304 distributes the optical signal output from the optical amplifier 303. A distributor is appropriately disposed between the distributor 304 and each dwelling unit according to the arrangement of each dwelling unit and the number of dwelling units. A V-ONU (Video-Optical Network Unit) is installed in each dwelling unit.

光信号の伝送においては伝送周波数帯域が高くなっても伝送可能距離が短くならないので、図７に示す共同受信システムでは、ＢＳ右旋放送及びＣＳ右旋放送を受信する衛星放送アンテナ２０１を、ＢＳ右旋放送、ＣＳ右旋放送、ＢＳ左旋放送、及びＣＳ左旋放送を受信する衛星放送アンテナに単純に取り換えることによって、ＢＳ左旋放送及びＣＳ左旋放送の受信が可能になる。   In the transmission of optical signals, the transmission distance is not shortened even if the transmission frequency band is increased. Therefore, in the joint reception system shown in FIG. 7, the satellite broadcast antenna 201 that receives BS right-handed broadcasting and CS right-handed broadcasting By simply replacing the satellite broadcasting antenna that receives right-handed broadcasting, CS right-handed broadcasting, BS left-handed broadcasting, and CS left-handed broadcasting, it is possible to receive BS left-handed broadcasting and CS left-handed broadcasting.

しかしながら、図７に示す共同受信システムでは、各住戸に設置され得るパーソナルコンピュータ等の通信機器からＣＡＴＶサービスの上り信号を出力して、分配器３０４、光増幅器３０３、Ｅ／Ｏ変換器３０２、及び混合器３０１を経由してＣＡＴＶ網に伝送することができない。つまり、図７に示す共同受信システムは、通信サービスのために別の設備を構築しなければ、ＣＡＴＶ網を利用した通信が不可能なシステムである。   However, in the joint reception system shown in FIG. 7, the CATV service uplink signal is output from a communication device such as a personal computer that can be installed in each dwelling unit, and the distributor 304, the optical amplifier 303, the E / O converter 302, and It cannot be transmitted to the CATV network via the mixer 301. That is, the joint reception system shown in FIG. 7 is a system in which communication using the CATV network is impossible unless another facility is constructed for the communication service.

また、図７に示す共同受信システムは、各住戸まで光ファイバーが敷設される所謂ＦＴＴＨ（Fiber To The Home）方式のシステムであり、同軸ケーブルの敷設で済む図６に示す共同受信システムと比較して敷設工事の難易度が高いシステムである。   The joint reception system shown in FIG. 7 is a so-called FTTH (Fiber To The Home) system in which an optical fiber is laid to each dwelling unit. Compared with the joint reception system shown in FIG. This system has a high level of difficulty in laying work.

本発明は、上記の状況に鑑み、左旋円偏波の信号を受信することが可能であってシステム構築の制約が少なく敷設工事の難易度が低い広帯域ハイブリッド共同受信システム及び当該広帯域ハイブリッド共同受信システムのために用いられる光受信機を提供することを目的とする。   In view of the above situation, the present invention provides a broadband hybrid joint reception system that can receive a left-handed circularly polarized signal, has few system construction restrictions, and has a low difficulty in laying work, and the broadband hybrid joint reception system An object of the present invention is to provide an optical receiver used for the above-mentioned purpose.

上記目的を達成するために本発明に係る広帯域ハイブリッド共同受信システムは、ＦＭ帯域、ＵＨＦ帯域、及びＣＡＴＶ帯域の少なくとも一つを含む周波数帯域の信号を電気信号で伝送する第１の伝送経路と、左旋円偏波の信号を電気信号から光信号に変換するＥ／Ｏ変換器と、前記Ｅ／Ｏ変換器から出力される光信号を伝送する第２の伝送経路と、前記第２の伝送経路によって伝送された光信号を電気信号に変換するＯ／Ｅ変換器と、前記第１の伝送経路によって伝送された電気信号と前記Ｏ／Ｅ変換器から出力される電気信号とを混合する混合器と、を備える構成（第１の構成）とする。   In order to achieve the above object, a broadband hybrid joint reception system according to the present invention includes a first transmission path for transmitting a signal in a frequency band including at least one of an FM band, a UHF band, and a CATV band as an electrical signal; An E / O converter that converts a left-hand circularly polarized signal from an electric signal to an optical signal, a second transmission path that transmits an optical signal output from the E / O converter, and the second transmission path An O / E converter that converts the optical signal transmitted by the first signal into an electric signal, and a mixer that mixes the electric signal transmitted through the first transmission path and the electric signal output from the O / E converter. And a configuration (first configuration).

また、上記第１の構成の広帯域ハイブリッド共同受信システムにおいて、前記第１の伝送経路が双方向増幅器を含んでいる構成（第２の構成）であってもよい。   In the broadband hybrid joint reception system having the first configuration, the first transmission path may include a bidirectional amplifier (second configuration).

また、上記第１または第２の構成の広帯域ハイブリッド共同受信システムにおいて、前記第１の伝送経路が右旋円偏波の信号も伝送し、前記第２の伝送経路が右旋円偏波の信号も伝送し、前記混合器が、前記第１の伝送経路によって伝送された電気信号に含まれる右旋円偏波の信号を除去してから電気信号の混合を行う構成（第３の構成）であってもよい。   In the broadband hybrid joint reception system having the first or second configuration, the first transmission path also transmits a right-hand circularly polarized signal, and the second transmission path has a right-hand circularly polarized signal. And the mixer mixes the electric signal after removing the right-handed circularly polarized signal contained in the electric signal transmitted through the first transmission path (third configuration). There may be.

また、上記第１〜第３いずれかの構成の広帯域ハイブリッド共同受信システムにおいて、前記第１の伝送経路が右旋円偏波の信号も伝送し、前記第２の伝送経路が右旋円偏波の信号も伝送し、前記混合器が、前記第２の伝送経路によって伝送された電気信号に含まれる右旋円偏波の信号を除去してから電気信号の混合を行う構成（第４の構成）であってもよい。   In the broadband hybrid joint reception system having any one of the first to third configurations, the first transmission path also transmits a right-handed circularly polarized signal, and the second transmission path is a right-handed circularly polarized wave. The signal is also transmitted, and the mixer mixes the electric signal after removing the right-handed circularly polarized signal contained in the electric signal transmitted through the second transmission path (fourth configuration). ).

上記目的を達成するために本発明に係る光受信機は、ＦＭ帯域、ＵＨＦ帯域、及びＣＡＴＶ帯域の少なくとも一つを含む周波数帯域の信号を電気信号で伝送する第１の伝送経路に接続される第１の端子と、左旋円偏波の信号を光信号で伝送する第２の伝送経路に接続される第２の端子と、前記第２の伝送経路によって伝送され前記第２の端子に入力された光信号を電気信号に変換するＯ／Ｅ変換器と、前記第１の伝送経路によって伝送され前記第１の端子に入力された電気信号と前記Ｏ／Ｅ変換器から出力される電気信号とを混合する混合器と、を備える構成（第５の構成）とする。   To achieve the above object, an optical receiver according to the present invention is connected to a first transmission path for transmitting a signal in a frequency band including at least one of an FM band, a UHF band, and a CATV band as an electric signal. A first terminal, a second terminal connected to a second transmission path for transmitting a left-handed circularly polarized signal as an optical signal, and a signal transmitted through the second transmission path and input to the second terminal. An O / E converter that converts the obtained optical signal into an electrical signal, an electrical signal transmitted through the first transmission path and input to the first terminal, and an electrical signal output from the O / E converter And a mixer (5th configuration).

また、上記第５の構成の光受信機は、前記第１の端子と前記混合器との間に双方向増幅器を備える構成（第６の構成）であってもよい。   The optical receiver having the fifth configuration may have a configuration (sixth configuration) including a bidirectional amplifier between the first terminal and the mixer.

本発明によると、左旋円偏波の信号を受信することが可能であってシステム構築の制約が少なく敷設工事の難易度が低い広帯域ハイブリッド共同受信システム及び当該広帯域ハイブリッド共同受信システムのために用いられる光受信機を実現することができる。   According to the present invention, a broadband hybrid joint reception system that can receive a left-handed circularly polarized signal, has few system construction restrictions, and has a low difficulty in laying work, and the broadband hybrid joint reception system are used. An optical receiver can be realized.

本発明の第１実施形態に係る広帯域ハイブリッド共同受信システムの構成を示す図である。It is a figure which shows the structure of the wideband hybrid joint reception system which concerns on 1st Embodiment of this invention. 図１に示す広帯域ハイブリッド共同受信システムの具体例を示す図である。It is a figure which shows the specific example of the wideband hybrid joint reception system shown in FIG. 図１に示す広帯域ハイブリッド共同受信システムの他の具体例を示す図である。It is a figure which shows the other specific example of the broadband hybrid joint reception system shown in FIG. 図１に示す広帯域ハイブリッド共同受信システムの更に他の具体例を示す図である。It is a figure which shows the other specific example of the broadband hybrid joint reception system shown in FIG. 本発明の第２実施形態に係る広帯域ハイブリッド共同受信システムの構成を示す図である。It is a figure which shows the structure of the wideband hybrid joint reception system which concerns on 2nd Embodiment of this invention. 従来の共同受信システムの一構成例を示す図である。It is a figure which shows the example of 1 structure of the conventional joint reception system. 従来の共同受信システムの他の構成例を示す図である。It is a figure which shows the other structural example of the conventional joint reception system.

本発明の実施形態について図面を参照して以下に説明する。   Embodiments of the present invention will be described below with reference to the drawings.

＜第１実施形態＞
本発明の第１実施形態に係る広帯域ハイブリッド共同受信システムの構成を図１に示す。図１に示す広帯域ハイブリッド共同受信システムは、双方向増幅器１と、Ｅ／Ｏ変換器２と、光増幅器３と、光受信機であるＶ−ＯＮＵ４と、分配器５と、を備える構成である。 <First Embodiment>
FIG. 1 shows the configuration of the broadband hybrid joint reception system according to the first embodiment of the present invention. The broadband hybrid joint reception system shown in FIG. 1 includes a bidirectional amplifier 1, an E / O converter 2, an optical amplifier 3, a V-ONU 4 that is an optical receiver, and a distributor 5. .

地上放送を受信する地上放送アンテナＡＮＴ１から出力される信号（７６ＭＨｚ以上９５ＭＨｚ以下のＦＭ帯域及び４７０ＭＨｚ以上７１０ＭＨｚ以下のＵＨＦ帯域の信号）又はＣＡＴＶサービスの下り信号（７０ＭＨｚ以上７７０ＭＨｚ以下の周波数帯域の信号）は、同軸ケーブルによってＶ−ＯＮＵ４の第１の端子４１に伝送される。そして、地上放送アンテナＡＮＴ１から出力される信号又はＣＡＴＶサービスの下り信号をＶ−ＯＮＵ４の第１の端子４１に伝送する伝送経路上には、双方向増幅器１が設置されている。双方向増幅器１は、地上放送アンテナＡＮＴ１から出力される信号又はＣＡＴＶサービスの下り信号を増幅する。   Signals output from the terrestrial broadcast antenna ANT1 that receives terrestrial broadcasts (FM band signals from 76 MHz to 95 MHz and UHF bands signals from 470 MHz to 710 MHz) or CATV service downlink signals (signals in the frequency band from 70 MHz to 770 MHz) Is transmitted to the first terminal 41 of the V-ONU 4 by a coaxial cable. The bidirectional amplifier 1 is installed on the transmission path for transmitting the signal output from the terrestrial broadcast antenna ANT1 or the downlink signal of the CATV service to the first terminal 41 of the V-ONU 4. The bidirectional amplifier 1 amplifies the signal output from the terrestrial broadcast antenna ANT1 or the downlink signal of the CATV service.

一方、ＢＳ左旋放送及びＣＳ左旋放送を受信する衛星放送アンテナＡＮＴ２から出力される左旋円偏波の信号（２２２４ＭＨｚ以上２６４３ＭＨｚ以下及び２７４８ＭＨｚ以上３２２４ＭＨｚ以下の周波数帯域の信号）は、Ｅ／Ｏ変換器２によって電気信号から光信号に変換される。Ｅ／Ｏ変換器２から出力される光信号は光ファイバーによってＶ−ＯＮＵ４の第２の端子４２に伝送される。そして、衛星放送アンテナＡＮＴ２から出力される信号をＶ−ＯＮＵ３の第２の端子４２に伝送する伝送経路上には、光増幅器３が設置されている。光増幅器３は、Ｅ／Ｏ変換器２から出力される光信号を増幅する。   On the other hand, a left-hand circularly polarized signal (a signal in a frequency band of 2224 MHz to 2643 MHz and 2748 MHz to 3224 MHz) output from the satellite broadcasting antenna ANT2 that receives BS left-handed broadcasting and CS left-handed broadcasting is an E / O converter 2. Is converted from an electrical signal to an optical signal. The optical signal output from the E / O converter 2 is transmitted to the second terminal 42 of the V-ONU 4 by an optical fiber. The optical amplifier 3 is installed on the transmission path for transmitting the signal output from the satellite broadcast antenna ANT2 to the second terminal 42 of the V-ONU 3. The optical amplifier 3 amplifies the optical signal output from the E / O converter 2.

Ｖ−ＯＮＵ４は、第１の端子４１と、第２の端子４２と、双方向増幅器４３と、Ｏ／Ｅ変換器４４と、混合器４５と、第３の端子４６と、を備えている。   The V-ONU 4 includes a first terminal 41, a second terminal 42, a bidirectional amplifier 43, an O / E converter 44, a mixer 45, and a third terminal 46.

第１の端子４１に入力された信号は双方向増幅器４３によって増幅される。第２の端子４２に入力された信号はＯ／Ｅ変換器４４によって光信号から電気信号に変換される。混合器４５は、双方向増幅器４３から出力される信号と、Ｏ／Ｅ変換器４４から出力される信号とを混合する。第３の端子４６は、混合器４５から出力される混合信号を出力する。第３の端子４６から出力される混合信号は、７６ＭＨｚ以上９５ＭＨｚ以下のＦＭ帯域及び４７０ＭＨｚ以上７１０ＭＨｚ以下のＵＨＦ帯域の信号又は７０ＭＨｚ以上７７０ＭＨｚ以下の周波数帯域の信号と、２２２４ＭＨｚ以上２６４３ＭＨｚ以下及び２７４８ＭＨｚ以上３２２４ＭＨｚ以下の周波数帯域の信号とが混合された電気信号である。   The signal input to the first terminal 41 is amplified by the bidirectional amplifier 43. The signal input to the second terminal 42 is converted from an optical signal to an electrical signal by the O / E converter 44. The mixer 45 mixes the signal output from the bidirectional amplifier 43 and the signal output from the O / E converter 44. The third terminal 46 outputs the mixed signal output from the mixer 45. The mixed signal output from the third terminal 46 includes an FM band of 76 MHz to 95 MHz and a UHF band signal of 470 MHz to 710 MHz, or a signal of a frequency band of 70 MHz to 770 MHz, 2224 MHz to 2643 MHz, and 2748 MHz to 3224 MHz. It is an electric signal mixed with signals in the following frequency bands.

分配器５は、Ｖ−ＯＮＵ４の第３の端子４６から出力される電気信号を分配する。双方向増幅器１と各住戸との間には、各住戸の配置や住戸数に応じて双方向増幅器１’や分配器５’が適宜配置される。Ｖ−ＯＮＵ４は、Ｖ−ＯＮＵ４の第３の端子４６から出力される電気信号に含まれる２２２４ＭＨｚ以上２６４３ＭＨｚ以下及び２７４８ＭＨｚ以上３２２４ＭＨｚ以下の周波数帯域の信号の減衰量並びにＢＳ左旋放送及びＣＳ左旋放送の受信を希望する住戸を考慮して双方向増幅器１と各住戸との間の適切な場所に配置すればよい。例えば図１に示す広帯域ハイブリッド共同受信システムにおいて双方向増幅器１’を１つ設けた場合、図２〜図４に示す各例のようなＶ−ＯＮＵ４の設置場所が考えられる。   The distributor 5 distributes the electrical signal output from the third terminal 46 of the V-ONU 4. Between the bidirectional amplifier 1 and each dwelling unit, a bidirectional amplifier 1 ′ and a distributor 5 ′ are appropriately arranged according to the arrangement of each dwelling unit and the number of dwelling units. The V-ONU 4 receives the attenuation of signals in the frequency bands of 2224 MHz to 2643 MHz and 2748 MHz to 3224 MHz included in the electrical signal output from the third terminal 46 of the V-ONU 4 and the BS left-handed broadcasting and CS left-handed broadcasting. In consideration of the dwelling unit that desires, it may be arranged at an appropriate location between the bidirectional amplifier 1 and each dwelling unit. For example, when one bi-directional amplifier 1 ′ is provided in the broadband hybrid joint reception system shown in FIG. 1, installation locations of the V-ONUs 4 as in the examples shown in FIGS. 2 to 4 can be considered.

また、各住戸に設置され得るパーソナルコンピュータ等の通信機器から出力されるＣＡＴＶサービスの上り信号が、分配器５、Ｖ−ＯＮＵ４、及び双方向増幅器１を経由してＣＡＴＶ網に伝送される。つまり、図１に示す広帯域ハイブリッド共同受信システムではＣＡＴＶ網を利用した通信も可能である。   Further, an upstream signal of the CATV service output from a communication device such as a personal computer that can be installed in each dwelling unit is transmitted to the CATV network via the distributor 5, the V-ONU 4, and the bidirectional amplifier 1. That is, the broadband hybrid joint reception system shown in FIG. 1 can also communicate using the CATV network.

図１に示す広帯域ハイブリッド共同受信システムは、２２２４ＭＨｚ以上の伝送周波数帯域の信号を途中まで光信号の形態で伝送し、その後電気信号に変換して７７０ＭＨｚ以下の伝送周波数帯域の電気信号と混合しているため、２２２４ＭＨｚ以上の伝送周波数帯域の放送を受信することが可能である。また、２２２４ＭＨｚ以上の伝送周波数帯域の信号を途中まで光信号の形態で伝送するため、２２２４ＭＨｚ以上の伝送周波数帯域の電気信号の減衰を補うために双方向増幅器を余分に増やさずに済む。これにより、システム構築の制約が少なくなり、例えば住戸数が多い場合でも容易に対応することができる。さらに、７７０ＭＨｚ以下の伝送周波数帯域の電気信号を伝送するための伝送経路には同軸ケーブルが使用でき、光ファイバーを用いる経路を２２２４ＭＨｚ以上の伝送周波数帯域の光信号を伝送するための伝送経路に止めているため、敷設工事の難易度が低い。特に、図６に示す共同受信システムが既に構築されている場合、図６に示す共同受信システムの同軸ケーブル網を、図１に示す広帯域ハイブリッド共同受信システムにおける７７０ＭＨｚ以下の伝送周波数帯域の電気信号を伝送するための伝送経路として利用することができるので、Ｅ／Ｏ変換器２と、光増幅器３と、Ｖ−ＯＮＵ４と、光ファイバーを用いる経路との追加のみで、図６に示す共同受信システムを図１に示す広帯域ハイブリッド共同受信システムに改修することができる。   The broadband hybrid joint reception system shown in FIG. 1 transmits a signal in the transmission frequency band of 2224 MHz or more in the form of an optical signal, then converts it to an electric signal and mixes it with an electric signal in the transmission frequency band of 770 MHz or less. Therefore, it is possible to receive a broadcast in a transmission frequency band of 2224 MHz or higher. Further, since a signal in the transmission frequency band of 2224 MHz or higher is transmitted halfway in the form of an optical signal, it is not necessary to increase the number of bidirectional amplifiers to compensate for the attenuation of the electrical signal in the transmission frequency band of 2224 MHz or higher. Thereby, restrictions on system construction are reduced, and for example, even when the number of dwelling units is large, it can be easily handled. Furthermore, a coaxial cable can be used as a transmission path for transmitting an electrical signal in a transmission frequency band of 770 MHz or less, and a path using an optical fiber is limited to a transmission path for transmitting an optical signal in a transmission frequency band of 2224 MHz or more. Therefore, the difficulty of laying work is low. In particular, when the joint reception system shown in FIG. 6 has already been constructed, the coaxial cable network of the joint reception system shown in FIG. 6 is used to transmit electrical signals in the transmission frequency band of 770 MHz or less in the broadband hybrid joint reception system shown in FIG. Since it can be used as a transmission path for transmission, only the addition of the E / O converter 2, the optical amplifier 3, the V-ONU 4, and the path using the optical fiber enables the joint reception system shown in FIG. The broadband hybrid joint reception system shown in FIG. 1 can be modified.

＜第２実施形態＞
本発明の第２実施形態に係る広帯域ハイブリッド共同受信システムの構成を図５に示す。図５に示す広帯域ハイブリッド共同受信システムは、Ｅ／Ｏ変換器２と、光増幅器３と、光受信機であるＶ−ＯＮＵ４と、双方向増幅器６と、分配器７と、を備える構成である。 Second Embodiment
FIG. 5 shows the configuration of a broadband hybrid joint reception system according to the second embodiment of the present invention. The broadband hybrid joint reception system shown in FIG. 5 includes an E / O converter 2, an optical amplifier 3, a V-ONU 4 that is an optical receiver, a bidirectional amplifier 6, and a distributor 7. .

地上放送を受信する地上放送アンテナＡＮＴ１から出力される信号（７６ＭＨｚ以上９５ＭＨｚ以下のＦＭ帯域及び４７０ＭＨｚ以上７１０ＭＨｚ以下のＵＨＦ帯域の信号）又はＣＡＴＶサービスの下り信号（７０ＭＨｚ以上７７０ＭＨｚ以下の周波数帯域の信号）は、双方向増幅器６に入力される。   Signals output from the terrestrial broadcast antenna ANT1 that receives terrestrial broadcasts (FM band signals from 76 MHz to 95 MHz and UHF bands signals from 470 MHz to 710 MHz) or CATV service downlink signals (signals in the frequency band from 70 MHz to 770 MHz) Is input to the bidirectional amplifier 6.

さらに、ＢＳ右旋放送及びＣＳ右旋放送を受信する衛星放送アンテナＡＮＴ３から出力される右旋円偏波の信号（１０３２ＭＨｚ以上１４８９ＭＨｚ以下及び１５９５ＭＨｚ以上２０７１ＭＨｚ以下の周波数帯域の信号）も、双方向増幅器６に入力される。   Further, a right-hand circularly polarized signal (a signal in a frequency band of 1032 MHz to 1489 MHz and 1595 MHz to 2071 MHz) output from a satellite broadcasting antenna ANT3 that receives BS right-handed broadcasting and CS right-handed broadcasting is also a bidirectional amplifier. 6 is input.

双方向増幅器６は、地上放送アンテナＡＮＴ１から出力される信号又はＣＡＴＶサービスの下り信号と、衛星放送アンテナＡＮＴ３から出力される信号とを混合して得られる信号を増幅する。   The bidirectional amplifier 6 amplifies a signal obtained by mixing the signal output from the terrestrial broadcast antenna ANT1 or the downlink signal of the CATV service and the signal output from the satellite broadcast antenna ANT3.

双方向増幅器６の出力信号は同軸ケーブルによって分配器７に伝送される。分配器７の第４の出力端子は同軸ケーブルを介してＶ−ＯＮＵ４の第１の端子４１に接続される。一方、分配器７の第１〜第３の出力端子はＶ−ＯＮＵ４に接続されない。このため、分配器７の第１〜第３の出力端子の下流（図５中のi〜iii）に配置される受信装置では、地上放送、ＢＳ右旋放送、及びＣＳ右旋放送の受信が可能になる。   The output signal of the bidirectional amplifier 6 is transmitted to the distributor 7 through a coaxial cable. The fourth output terminal of the distributor 7 is connected to the first terminal 41 of the V-ONU 4 via a coaxial cable. On the other hand, the first to third output terminals of the distributor 7 are not connected to the V-ONU 4. For this reason, in the receiving device disposed downstream of the first to third output terminals (i to iii in FIG. 5) of the distributor 7, reception of terrestrial broadcasting, BS right-handed broadcasting, and CS right-handed broadcasting is performed. It becomes possible.

ＢＳ右旋放送、ＣＳ右旋放送、ＢＳ左旋放送、及びＣＳ左旋放送を受信する衛星放送アンテナＡＮＴ４から出力される信号（１０３２ＭＨｚ以上１４８９ＭＨｚ以下、１５９５ＭＨｚ以上２０７１ＭＨｚ以下、２２２４ＭＨｚ以上２６４３ＭＨｚ以下、及び２７４８ＭＨｚ以上３２２４ＭＨｚ以下の周波数帯域の信号）は、Ｅ／Ｏ変換器２によって電気信号から光信号に変換される。Ｅ／Ｏ変換器２から出力される光信号は光ファイバーによってＶ−ＯＮＵ４の第２の端子４２に伝送される。そして、衛星放送アンテナＡＮＴ４から出力される信号をＶ−ＯＮＵ４の第２の端子４２に伝送する伝送経路上には、光増幅器３が設置されている。光増幅器３は、Ｅ／Ｏ変換器２から出力される光信号を増幅する。   Signals output from satellite broadcasting antenna ANT4 that receives BS right-handed broadcasting, CS right-handed broadcasting, BS left-handed broadcasting, and CS left-handed broadcasting (1032 MHz to 1489 MHz, 1595 MHz to 2071 MHz, 2224 MHz to 2643 MHz, and 2748 MHz to 3224 MHz A signal in the following frequency band) is converted from an electric signal to an optical signal by the E / O converter 2. The optical signal output from the E / O converter 2 is transmitted to the second terminal 42 of the V-ONU 4 by an optical fiber. The optical amplifier 3 is installed on the transmission path for transmitting the signal output from the satellite broadcast antenna ANT4 to the second terminal 42 of the V-ONU 4. The optical amplifier 3 amplifies the optical signal output from the E / O converter 2.

Ｖ−ＯＮＵ４は、第１の端子４１と、第２の端子４２と、双方向増幅器４３と、Ｏ／Ｅ変換器４４と、混合器４５と、第３の端子４６と、を備えている。混合器４５は、ローパスフィルタ部４５１と、ハイパスフィルタ部４５２と、混合部４５３とによって構成されている。   The V-ONU 4 includes a first terminal 41, a second terminal 42, a bidirectional amplifier 43, an O / E converter 44, a mixer 45, and a third terminal 46. The mixer 45 includes a low pass filter unit 451, a high pass filter unit 452, and a mixing unit 453.

第１の端子４１に入力された信号は双方向増幅器４３によって増幅される。ローパスフィルタ部４５１は、双方向増幅器４３から出力される信号に含まれる１０３２ＭＨｚ以上１４８９ＭＨｚ以下及び１５９５ＭＨｚ以上２０７１ＭＨｚ以下の周波数帯域の信号を除去する。   The signal input to the first terminal 41 is amplified by the bidirectional amplifier 43. The low-pass filter unit 451 removes signals in frequency bands of 1032 MHz to 1489 MHz and 1595 MHz to 2071 MHz included in the signal output from the bidirectional amplifier 43.

第２の端子４２に入力された信号はＯ／Ｅ変換器４４によって光信号から電気信号に変換される。ハイパスフィルタ部４５２は、Ｏ／Ｅ変換器４４から出力される信号に含まれる１０３２ＭＨｚ以上１４８９ＭＨｚ以下及び１５９５ＭＨｚ以上２０７１ＭＨｚ以下の周波数帯域の信号を除去する。混合部４５３は、ローパスフィルタ部４５１から出力される信号と、ハイパスフィルタ部４５２から出力される信号とを混合する。第３の端子４６は、混合部４５３から出力される混合信号を出力する。第３の端子４６から出力される混合信号は、７６ＭＨｚ以上９５ＭＨｚ以下のＦＭ帯域及び４７０ＭＨｚ以上７１０ＭＨｚ以下のＵＨＦ帯域の信号又は７０ＭＨｚ以上７７０ＭＨｚ以下の周波数帯域の信号と、２２２４ＭＨｚ以上２６４３ＭＨｚ以下及び２７４８ＭＨｚ以上３２２４ＭＨｚ以下の周波数帯域の信号とが混合された電気信号である。このため、Ｖ−ＯＮＵ４の第３の端子４６の下流（図５中のiv）に配置される受信装置では、地上放送、ＢＳ左旋放送、及びＣＳ左旋放送の受信が可能になる。   The signal input to the second terminal 42 is converted from an optical signal to an electrical signal by the O / E converter 44. The high-pass filter unit 452 removes signals in the frequency bands of 1032 MHz to 1489 MHz and 1595 MHz to 2071 MHz included in the signal output from the O / E converter 44. The mixing unit 453 mixes the signal output from the low pass filter unit 451 and the signal output from the high pass filter unit 452. The third terminal 46 outputs the mixed signal output from the mixing unit 453. The mixed signal output from the third terminal 46 includes an FM band of 76 MHz to 95 MHz and a UHF band signal of 470 MHz to 710 MHz, or a signal of a frequency band of 70 MHz to 770 MHz, 2224 MHz to 2643 MHz, and 2748 MHz to 3224 MHz. It is an electric signal mixed with signals in the following frequency bands. For this reason, the receiving device disposed downstream of the third terminal 46 of the V-ONU 4 (iv in FIG. 5) can receive terrestrial broadcasting, BS left-handed broadcasting, and CS left-handed broadcasting.

双方向増幅器６と各住戸との間には、各住戸の配置や住戸数に応じて双方向増幅器や分配器が適宜配置される。Ｖ−ＯＮＵ４は、Ｖ−ＯＮＵ４の第３の端子４６から出力される電気信号に含まれる２２２４ＭＨｚ以上２６４３ＭＨｚ以下及び２７４８ＭＨｚ以上３２２４ＭＨｚ以下の周波数帯域の信号の減衰量並びにＢＳ左旋放送及びＣＳ左旋放送の受信を希望する住戸を考慮して双方向増幅器６と各住戸との間の適切な場所に配置すればよい。   Between the bidirectional amplifier 6 and each dwelling unit, a bidirectional amplifier and a distributor are appropriately arranged according to the arrangement of each dwelling unit and the number of dwelling units. The V-ONU 4 receives the attenuation of signals in the frequency bands of 2224 MHz to 2643 MHz and 2748 MHz to 3224 MHz included in the electrical signal output from the third terminal 46 of the V-ONU 4 and the BS left-handed broadcasting and CS left-handed broadcasting. In consideration of the dwelling unit that desires, it may be arranged at an appropriate location between the bidirectional amplifier 6 and each dwelling unit.

また、各住戸に設置され得るパーソナルコンピュータ等の通信機器から出力されるＣＡＴＶサービスの上り信号が、Ｖ−ＯＮＵ４、分配器７、及び双方向増幅器６を経由してＣＡＴＶ網に伝送される。つまり、図５に示す広帯域ハイブリッド共同受信システムではＣＡＴＶ網を利用した通信も可能である。   Further, an upstream signal of CATV service output from a communication device such as a personal computer that can be installed in each dwelling unit is transmitted to the CATV network via the V-ONU 4, the distributor 7, and the bidirectional amplifier 6. That is, in the broadband hybrid joint reception system shown in FIG. 5, communication using the CATV network is possible.

図５に示す広帯域ハイブリッド共同受信システムは、２２２４ＭＨｚ以上の伝送周波数帯域の信号を途中まで光信号の形態で伝送し、その後電気信号に変換して７７０ＭＨｚ以下の伝送周波数帯域の電気信号と混合しているため、２２２４ＭＨｚ以上の伝送周波数帯域の放送を受信することが可能である。また、２２２４ＭＨｚ以上の伝送周波数帯域の信号を途中まで光信号の形態で伝送するため、２２２４ＭＨｚ以上の伝送周波数帯域の電気信号の減衰を補うために双方向増幅器を余分に増やさずに済む。これにより、システム構築の制約が少なくなり、例えば住戸数が多い場合でも容易に対応することができる。さらに、７７０ＭＨｚ以下の伝送周波数帯域の電気信号を伝送するための伝送経路には同軸ケーブルが使用でき、光ファイバーを用いる経路を２２２４ＭＨｚ以上の伝送周波数帯域の光信号を伝送するための伝送経路に止めているため、敷設工事の難易度が低い。特に、図６に示す共同受信システムが既に構築されている場合、図６に示す共同受信システムの同軸ケーブル網を、図５に示す広帯域ハイブリッド共同受信システムにおける７７０ＭＨｚ以下の伝送周波数帯域の電気信号を伝送するための伝送経路として利用することができるので、Ｅ／Ｏ変換器２と、光増幅器３と、Ｖ−ＯＮＵ４と、光ファイバーを用いる経路との追加のみで、図６に示す共同受信システムを図５に示す広帯域ハイブリッド共同受信システムに改修することができる。   The broadband hybrid joint reception system shown in FIG. 5 transmits a signal in the transmission frequency band of 2224 MHz or higher in the form of an optical signal, then converts it to an electric signal and mixes it with an electric signal in the transmission frequency band of 770 MHz or lower. Therefore, it is possible to receive a broadcast in a transmission frequency band of 2224 MHz or higher. Further, since a signal in the transmission frequency band of 2224 MHz or higher is transmitted halfway in the form of an optical signal, it is not necessary to increase the number of bidirectional amplifiers to compensate for the attenuation of the electrical signal in the transmission frequency band of 2224 MHz or higher. Thereby, restrictions on system construction are reduced, and for example, even when the number of dwelling units is large, it can be easily handled. Furthermore, a coaxial cable can be used as a transmission path for transmitting an electrical signal in a transmission frequency band of 770 MHz or less, and a path using an optical fiber is limited to a transmission path for transmitting an optical signal in a transmission frequency band of 2224 MHz or more. Therefore, the difficulty of laying work is low. In particular, when the joint reception system shown in FIG. 6 has already been constructed, the coaxial cable network of the joint reception system shown in FIG. 6 is used as an electrical signal in the transmission frequency band of 770 MHz or less in the broadband hybrid joint reception system shown in FIG. Since it can be used as a transmission path for transmission, only the addition of the E / O converter 2, the optical amplifier 3, the V-ONU 4, and the path using the optical fiber enables the joint reception system shown in FIG. The broadband hybrid joint reception system shown in FIG. 5 can be modified.

さらに図５に示す広帯域ハイブリッド共同受信システムは、Ｖ−ＯＮＵ４の第３の端子４６の下流（図５中のiv）において、ＢＳ左旋放送及びＣＳ左旋放送の信号レベルが不要に高くなることを防止することができる。なお、Ｖ−ＯＮＵ４の第３の端子４６の下流（図５中のiv）に配置される受信装置においても、ＢＳ右旋放送及びＣＳ右旋放送の受信を可能にするために、ローパスフィルタ部４５１及びハイパスフィルタ部４５２のいずれか一方を設けない構成にしてもよい。   Further, the broadband hybrid joint reception system shown in FIG. 5 prevents the signal level of BS left-handed broadcasting and CS left-handed broadcasting from becoming unnecessarily high downstream of the third terminal 46 of V-ONU 4 (iv in FIG. 5). can do. Note that the low-pass filter unit is also provided in the receiving device disposed downstream of the third terminal 46 of the V-ONU 4 (iv in FIG. 5) in order to enable reception of BS right-handed broadcasting and CS right-handed broadcasting. One of the 451 and the high-pass filter unit 452 may be omitted.

＜その他＞
本明細書中に開示されている種々の技術的特徴は、上記実施形態のほか、その技術的創作の主旨を逸脱しない範囲で種々の変更を加えることが可能である。例えば上述した実施形態では、Ｖ−ＯＮＵ４が双方向増幅器４３を備える構成であったが、Ｖ−ＯＮＵが双方向増幅器を備えない構成であってもよい。また、Ｖ−ＯＮＵ４を構成する部品である双方向増幅器４３、Ｏ／Ｅ変換器４４、及び混合器４５を、Ｖ−ＯＮＵ４のように１つの筐体に収納するのではなく、別々の機器にして配置してもよい。 <Others>
Various technical features disclosed in the present specification can be variously modified within the scope of the technical creation in addition to the above-described embodiment. For example, in the above-described embodiment, the V-ONU 4 is configured to include the bidirectional amplifier 43, but the V-ONU may be configured not to include the bidirectional amplifier. In addition, the bidirectional amplifier 43, the O / E converter 44, and the mixer 45, which are components constituting the V-ONU 4, are not housed in a single housing as in the V-ONU 4, but are separated from each other. May be arranged.

１、６ 双方向増幅器
２ Ｅ／Ｏ変換器
３ 光増幅器
４ Ｖ−ＯＮＵ
４１ 第１の端子
４２ 第２の端子
４３ 双方向増幅器
４４ Ｏ／Ｅ変換器
４５ 混合器
４５１ ローパスフィルタ部
４５２ ハイパスフィルタ部
４５３ 混合部
４６ 第３の端子
５、７ 分配器
ＡＮＴ１ 地上放送アンテナ
ＡＮＴ２〜ＡＮＴ４ 衛星放送アンテナ 1, 6 Bidirectional amplifier 2 E / O converter 3 Optical amplifier 4 V-ONU
41 1st terminal 42 2nd terminal 43 Bidirectional amplifier 44 O / E converter 45 Mixer 451 Low pass filter unit 452 High pass filter unit 453 Mixing unit 46 3rd terminal 5, 7 Divider ANT1 Terrestrial broadcast antenna ANT2 ANT4 satellite broadcasting antenna

Claims (6)

ＦＭ帯域、ＵＨＦ帯域、及びＣＡＴＶ帯域の少なくとも一つを含む周波数帯域の信号を電気信号で伝送する第１の伝送経路と、
左旋円偏波の信号を電気信号から光信号に変換するＥ／Ｏ変換器と、
前記Ｅ／Ｏ変換器から出力される光信号を伝送する第２の伝送経路と、
前記第２の伝送経路によって伝送された光信号を電気信号に変換するＯ／Ｅ変換器と、
前記第１の伝送経路によって伝送された電気信号と前記Ｏ／Ｅ変換器から出力される電気信号とを混合する混合器と、を備えることを特徴する広帯域ハイブリッド共同受信システム。 A first transmission path for transmitting a signal in a frequency band including at least one of an FM band, a UHF band, and a CATV band by an electric signal;
An E / O converter that converts a left-handed circularly polarized signal from an electrical signal to an optical signal;
A second transmission path for transmitting an optical signal output from the E / O converter;
An O / E converter that converts an optical signal transmitted through the second transmission path into an electrical signal;
A wideband hybrid joint reception system comprising: a mixer that mixes an electric signal transmitted through the first transmission path and an electric signal output from the O / E converter. 前記第１の伝送経路が双方向増幅器を含んでいる請求項１に記載の広帯域ハイブリッド共同受信システム。   The wideband hybrid joint reception system according to claim 1, wherein the first transmission path includes a bidirectional amplifier. 前記第１の伝送経路が右旋円偏波の信号も伝送し、
前記第２の伝送経路が右旋円偏波の信号も伝送し、
前記混合器が、前記第１の伝送経路によって伝送された電気信号に含まれる右旋円偏波の信号を除去してから電気信号の混合を行う請求項１または請求項２に記載の広帯域ハイブリッド共同受信システム。 The first transmission path also transmits a right-hand circularly polarized signal,
The second transmission path also transmits a right-hand circularly polarized signal,
3. The broadband hybrid according to claim 1, wherein the mixer performs mixing of the electric signal after removing a right-handed circularly polarized wave signal included in the electric signal transmitted through the first transmission path. 4. Joint reception system. 前記第１の伝送経路が右旋円偏波の信号も伝送し、
前記第２の伝送経路が右旋円偏波の信号も伝送し、
前記混合器が、前記第２の伝送経路によって伝送された電気信号に含まれる右旋円偏波の信号を除去してから電気信号の混合を行う請求項１〜３のいずれか一項に記載の広帯域ハイブリッド共同受信システム。 The first transmission path also transmits a right-hand circularly polarized signal,
The second transmission path also transmits a right-hand circularly polarized signal,
The said mixer performs the mixing of an electrical signal, after removing the signal of the right-handed circularly polarized wave contained in the electrical signal transmitted by the said 2nd transmission path. Broadband hybrid joint reception system. ＦＭ帯域、ＵＨＦ帯域、及びＣＡＴＶ帯域の少なくとも一つを含む周波数帯域の信号を電気信号で伝送する第１の伝送経路に接続される第１の端子と、
左旋円偏波の信号を光信号で伝送する第２の伝送経路に接続される第２の端子と、
前記第２の伝送経路によって伝送され前記第２の端子に入力された光信号を電気信号に変換するＯ／Ｅ変換器と、
前記第１の伝送経路によって伝送され前記第１の端子に入力された電気信号と前記Ｏ／Ｅ変換器から出力される電気信号とを混合する混合器と、を備えることを特徴とする光受信機。 A first terminal connected to a first transmission path for transmitting a signal in a frequency band including at least one of an FM band, a UHF band, and a CATV band by an electrical signal;
A second terminal connected to a second transmission path for transmitting a left-handed circularly polarized signal as an optical signal;
An O / E converter that converts an optical signal transmitted through the second transmission path and input to the second terminal into an electrical signal;
An optical receiver comprising: a mixer that mixes an electric signal transmitted through the first transmission path and input to the first terminal, and an electric signal output from the O / E converter. Machine. 前記第１の端子と前記混合器との間に双方向増幅器を備える請求項５に記載の光受信機。   The optical receiver according to claim 5, further comprising a bidirectional amplifier between the first terminal and the mixer.
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