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JP6622099B2 - Receiving apparatus and communication system - Google Patents

Receiving apparatus and communication system Download PDF

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JP6622099B2
JP6622099B2 JP2016018207A JP2016018207A JP6622099B2 JP 6622099 B2 JP6622099 B2 JP 6622099B2 JP 2016018207 A JP2016018207 A JP 2016018207A JP 2016018207 A JP2016018207 A JP 2016018207A JP 6622099 B2 JP6622099 B2 JP 6622099B2
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JP2017139572A (en
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アブデルモウラ ベッカリ
アブデルモウラ ベッカリ
西村　公佐
公佐 西村
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KDDI Corp
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Description

本発明は、２重化のため、光信号と無線信号の送受信を行う通信システムに関する。   The present invention relates to a communication system that transmits and receives an optical signal and a radio signal for duplexing.

例えば、光ファイバを敷設することなく通信を行うために無線通信又は光無線通信が使用される。無線通信とは、自由空間を介して無線信号の送受信を行う方式であり、光無線通信とは、自由空間を介して光信号の送受信を行う方式である。無線通信は降雨等の影響を受けやすい一方、光無線通信は霧や降雪の影響を受けやすい。このため、無線通信のための無線伝送路と、光無線通信のための光無線伝送路とを設けて伝送路の２重化を行う構成が特許文献１から３において提案されている。   For example, wireless communication or optical wireless communication is used to perform communication without installing an optical fiber. The wireless communication is a method for transmitting and receiving a radio signal through a free space, and the optical wireless communication is a method for transmitting and receiving an optical signal through a free space. While wireless communication is susceptible to rain and the like, optical wireless communication is susceptible to fog and snow. For this reason, Patent Documents 1 to 3 propose a configuration in which a wireless transmission path for wireless communication and an optical wireless transmission path for optical wireless communication are provided to duplicate the transmission path.

米国特許出願公開第２００４／０２０８５９１US Patent Application Publication No. 2004/0208591 米国特許出願公開第２００２／０１２２２３０US Patent Application Publication No. 2002/0122230 米国特許第８６８２１７１US Pat. No. 8,682,171

特許文献１から３が開示する光通信システムの概要を図１に示す。図１において、光送信装置１と送信装置２との間には光ファイバが敷設されており、送信装置２と受信装置３との間は、光無線伝送路４と無線伝送路５により二重化されている。光送信装置１は、連続光を送信データで変調した光変調信号を送信装置２に送信する。送信装置２は、光変調信号を復調した後、光無線伝送路４及び無線伝送路５での送信のために、光無線伝送路４及び無線伝送路５のそれぞれのための変調処理を行う。受信装置３は、光無線伝送路４から受信した光信号の復調処理を行い、かつ、無線伝送路５から受信した無線信号の復調処理を行う。そして、受信装置３は、例えば、光無線伝送路４及び無線伝送路５のいずれかからの復調信号を出力する。   An outline of an optical communication system disclosed in Patent Documents 1 to 3 is shown in FIG. In FIG. 1, an optical fiber is laid between the optical transmission device 1 and the transmission device 2, and the transmission device 2 and the reception device 3 are duplexed by the optical wireless transmission path 4 and the wireless transmission path 5. ing. The optical transmission device 1 transmits an optical modulation signal obtained by modulating continuous light with transmission data to the transmission device 2. The transmitter 2 demodulates the optical modulation signal, and then performs modulation processing for each of the optical wireless transmission path 4 and the wireless transmission path 5 for transmission on the optical wireless transmission path 4 and the wireless transmission path 5. The receiving device 3 demodulates the optical signal received from the optical wireless transmission path 4 and performs the demodulation process of the wireless signal received from the wireless transmission path 5. Then, for example, the receiving device 3 outputs a demodulated signal from either the optical wireless transmission path 4 or the wireless transmission path 5.

この様に、特許文献１から３が開示する光通信システムにおいては、送信装置２において、光送信装置１から受信する光信号の復調と、光無線伝送路４に送信するための変調と、無線伝送路５に送信するための変調が独立して行われる。同様に、受信装置３においては、光無線伝送路４から受信する光信号の復調と、無線伝送路５から受信する無線信号の復調が独立して行われる。   As described above, in the optical communication systems disclosed in Patent Documents 1 to 3, the transmitter 2 demodulates the optical signal received from the optical transmitter 1, the modulation for transmission to the optical wireless transmission path 4, and the wireless Modulation for transmission to the transmission line 5 is performed independently. Similarly, in the receiving device 3, demodulation of the optical signal received from the optical wireless transmission path 4 and demodulation of the wireless signal received from the wireless transmission path 5 are performed independently.

本発明は、光信号と無線信号とによる２重化を簡易な構成で行う受信装置及び通信システムを提供するものである。
The present invention is to provide a row cormorants receiving apparatus and communication system of the duplexed by the optical signal and a radio signal with a simple configuration.

本発明の一側面によると、無線伝送路と光伝送路から信号を受信する受信装置は、前記光伝送路から光変調信号と光トーン信号を含む光信号を受信する第１受信手段と、前記無線伝送路から無線信号を受信し、前記無線信号を電気信号に変換して第１電気変調信号を出力する第２受信手段と、前記光信号に含まれる前記光変調信号と前記光トーン信号とをまとめて光電変換し、前記光変調信号と前記光トーン信号との周波数差の周波数の第２電気変調信号を出力する出力手段と、前記第１電気変調信号又は前記第２電気変調信号を復調する復調手段と、を備え、前記第１電気変調信号の周波数及び変調方式は、それぞれ、前記第２電気変調信号の周波数及び変調方式と同じであることを特徴とする。
According to one aspect of the present invention, a receiving device that receives a signal from a wireless transmission path and an optical transmission path includes a first receiving unit that receives an optical signal including an optical modulation signal and an optical tone signal from the optical transmission path, and Second receiving means for receiving a radio signal from a radio transmission line, converting the radio signal into an electric signal and outputting a first electric modulation signal; the optical modulation signal and the optical tone signal included in the optical signal; Output means for outputting a second electric modulation signal having a frequency difference between the optical modulation signal and the optical tone signal, and demodulating the first electric modulation signal or the second electric modulation signal And a demodulating means for performing the first electric modulation signal, wherein the frequency and modulation method of the first electric modulation signal are the same as the frequency and modulation method of the second electric modulation signal, respectively .

本発明によると、光信号と無線信号とによる２重化を簡易な構成で行うことができる。   According to the present invention, duplexing by an optical signal and a radio signal can be performed with a simple configuration.

一実施形態による光通信システムの構成図。The block diagram of the optical communication system by one Embodiment. 一実施形態による送信装置の構成図。The block diagram of the transmitter by one Embodiment. 一実施形態による送信装置が受信する光信号を示す図。The figure which shows the optical signal which the transmitter by one Embodiment receives. 一実施形態による送信装置が送信する無線信号を示す図。The figure which shows the radio signal which the transmitter by one Embodiment transmits. 一実施形態による受信装置の構成図。The block diagram of the receiver by one Embodiment.

以下、本発明の例示的な実施形態について図面を参照して説明する。なお、以下の実施形態は例示であり、本発明を実施形態の内容に限定するものではない。また、以下の各図においては、実施形態の説明に必要ではない構成要素については図から省略する。   Hereinafter, exemplary embodiments of the present invention will be described with reference to the drawings. In addition, the following embodiment is an illustration and does not limit this invention to the content of embodiment. In the following drawings, components that are not necessary for the description of the embodiments are omitted from the drawings.

図１は、本実施形態の光通信システムの構成図である。光送信装置１と送信装置２との間には光ファイバが敷設されており、送信装置２と受信装置３との間は、光無線伝送路４と無線伝送路５により二重化されている。光送信装置１は、図３に示す様に、中心周波数ｆ０の光変調信号と、周波数ｆ０＋ｆ１の光トーン信号を含む光信号を送信装置２に送信する。なお、周波数ｆ１は無線周波数帯の周波数とする。本実施形態において、光トーン信号の周波数を光変調信号の中心周波数よりｆ１だけ高いものとするが、光トーン信号の周波数を光変調信号の中心周波数よりｆ１だけ低くすることもできる。 FIG. 1 is a configuration diagram of an optical communication system according to the present embodiment. An optical fiber is laid between the optical transmission device 1 and the transmission device 2, and the optical transmission line 4 and the wireless transmission line 5 are duplexed between the transmission device 2 and the reception device 3. As shown in FIG. 3, the optical transmission device 1 transmits an optical signal including an optical modulation signal having a center frequency f 0 and an optical tone signal having a frequency f 0 + f 1 to the transmission device 2. It should be noted that the frequency f 1 is the frequency of the radio frequency band. In the present embodiment, the frequency of the optical tone signal is higher by f 1 than the center frequency of the optical modulation signal, but the frequency of the optical tone signal can also be lower by f 1 than the center frequency of the optical modulation signal.

図２は、本実施形態による送信装置２の構成図である。光スプリッタ２０は、光送信装置１から図３に示す光信号を受信し、受信した光信号を２分岐し、光送信部２３と、光電変換部２１に出力する。光電変換部２１は、図３に示す光信号の光電変換を行う。光電変換により、光変調信号と光トーン信号の周波数差に応じた電気変調信号が得られる。つまり、図４に示す様に、中心周波数がｆ１の電気変調信号が得られる。なお、周波数ｆ１は、上述した様に無線周波数帯の周波数である。無線送信部２２は、中心周波数がｆ１の電気変調信号の増幅処理を行い、無線信号として無線伝送路５に送信する。また、光送信部２３は、図３に示す光信号の増幅処理等を行い、光無線信号として光無線伝送路４に送信する。 FIG. 2 is a configuration diagram of the transmission device 2 according to the present embodiment. The optical splitter 20 receives the optical signal shown in FIG. 3 from the optical transmitter 1, splits the received optical signal into two, and outputs the optical signal to the optical transmitter 23 and the photoelectric converter 21. The photoelectric conversion unit 21 performs photoelectric conversion of the optical signal shown in FIG. An electrical modulation signal corresponding to the frequency difference between the optical modulation signal and the optical tone signal is obtained by photoelectric conversion. That is, as shown in FIG. 4, an electric modulation signal having a center frequency f 1 is obtained. Note that the frequency f 1 is a frequency in the radio frequency band as described above. The wireless transmission unit 22 performs an amplification process on the electrical modulation signal having a center frequency f 1 and transmits the amplified signal to the wireless transmission path 5 as a wireless signal. Further, the optical transmitter 23 performs amplification processing of the optical signal shown in FIG. 3 and transmits the optical signal to the optical wireless transmission path 4 as an optical wireless signal.

図５は、本実施形態による受信装置３の構成図である。無線受信部３３は、無線伝送路５から無線信号を受信し、図４に示す電気変調信号を復調部３４に出力する。光受信部３１は、光無線伝送路４から図３に示す光信号を受信し光電変換部３２に出力する。光電変換部３２は、図３に示す光信号を光電変換し、図４に示す電気変調信号を復調部３４に出力する。復調部３４は、例えば、無線受信部３３から受信する電気変調信号と、光電変換部３２から受信する電気復調信号のいずれかを復調して出力する。   FIG. 5 is a configuration diagram of the receiving device 3 according to the present embodiment. The wireless reception unit 33 receives a wireless signal from the wireless transmission path 5 and outputs the electrical modulation signal shown in FIG. 4 to the demodulation unit 34. The optical receiver 31 receives the optical signal shown in FIG. 3 from the optical wireless transmission path 4 and outputs it to the photoelectric converter 32. The photoelectric conversion unit 32 photoelectrically converts the optical signal shown in FIG. 3 and outputs the electric modulation signal shown in FIG. 4 to the demodulation unit 34. For example, the demodulator 34 demodulates and outputs either the electrical modulation signal received from the wireless reception unit 33 or the electrical demodulation signal received from the photoelectric conversion unit 32.

以上、本実施形態の送信装置２は、光送信装置１から受信する光信号の復調や、光無線伝送路４や無線伝送路５に送信するための変調処理を行わない。また、本実施形態の受信装置２の復調部３４には、いずれの伝送路で伝送されたかに拘わらず、同じ電気変調信号が入力され、伝送路毎の独立した復調処理を必要としない。よって、光を使用した伝送路と無線を使用した伝送路との間で切り替えを行う光通信システムの構成を簡略化できる。なお、本実施形態においては、光無線伝送路４により説明を行ったが、光無線伝送路４は、通常の光ファイバを用いた光伝送路であっても良い。   As described above, the transmission device 2 according to the present embodiment does not perform demodulation of an optical signal received from the optical transmission device 1 or modulation processing for transmission to the optical wireless transmission path 4 or the wireless transmission path 5. In addition, the same electrical modulation signal is input to the demodulation unit 34 of the receiving device 2 of this embodiment regardless of which transmission path is used, and independent demodulation processing for each transmission path is not required. Therefore, it is possible to simplify the configuration of an optical communication system that switches between a transmission line using light and a transmission line using radio. In the present embodiment, the optical wireless transmission path 4 has been described. However, the optical wireless transmission path 4 may be an optical transmission path using a normal optical fiber.

また、本実施形態において、送信装置２は、常時、光無線伝送路４と無線伝送路５の両方を使用して信号を送信し、受信装置３は、光無線伝送路４と無線伝送路５から受信する信号の一方を選択して復調していた。しかしながら、送信装置２は、通常状態において、光無線伝送路４と無線伝送路５のいずれか一方のみを使用し、使用している伝送路が障害となったときのみ他方の伝送路を使用する構成であっても良い。また、受信装置３は、光無線伝送路４と無線伝送路５から受信する信号の両方をそれぞれ復調する構成であっても良い。   In the present embodiment, the transmission device 2 always transmits signals using both the optical wireless transmission path 4 and the wireless transmission path 5, and the receiving apparatus 3 transmits the optical wireless transmission path 4 and the wireless transmission path 5. One of the signals received from is selected and demodulated. However, the transmission device 2 uses only one of the optical wireless transmission path 4 and the wireless transmission path 5 in the normal state, and uses the other transmission path only when the transmission path being used becomes an obstacle. It may be a configuration. The receiving apparatus 3 may be configured to demodulate both signals received from the optical wireless transmission path 4 and the wireless transmission path 5.

２０：光スプリッタ、２１：光電変換部、２２：無線送信部、２３：光送信部   20: optical splitter, 21: photoelectric conversion unit, 22: wireless transmission unit, 23: optical transmission unit

Claims (3)

無線伝送路と光伝送路から信号を受信する受信装置であって、
前記光伝送路から光変調信号と光トーン信号を含む光信号を受信する第１受信手段と、
前記無線伝送路から無線信号を受信し、前記無線信号を電気信号に変換して第１電気変調信号を出力する第２受信手段と、
前記光信号に含まれる前記光変調信号と前記光トーン信号とをまとめて光電変換し、前記光変調信号と前記光トーン信号との周波数差の周波数の第２電気変調信号を出力する出力手段と、
前記第１電気変調信号又は前記第２電気変調信号を復調する復調手段と、
を備え、
前記第１電気変調信号の周波数及び変調方式は、それぞれ、前記第２電気変調信号の周波数及び変調方式と同じであることを特徴とする受信装置。 A receiving device for receiving signals from a wireless transmission line and an optical transmission line,
First receiving means for receiving an optical signal including an optical modulation signal and an optical tone signal from the optical transmission line;
Second receiving means for receiving a radio signal from the radio transmission path, converting the radio signal into an electric signal, and outputting a first electric modulation signal;
Output means for collectively photoelectrically converting the optical modulation signal and the optical tone signal included in the optical signal and outputting a second electric modulation signal having a frequency difference between the optical modulation signal and the optical tone signal; ,
Demodulation means for demodulating the first electrical modulation signal or the second electrical modulation signal;
Equipped with a,
The receiving apparatus according to claim 1, wherein a frequency and a modulation method of the first electric modulation signal are the same as a frequency and a modulation method of the second electric modulation signal, respectively . 前記光伝送路は、光無線伝送路であることを特徴とする請求項１に記載の受信装置。 The receiving apparatus according to claim 1 , wherein the optical transmission path is an optical wireless transmission path. 無線伝送路と光伝送路に信号を送信する送信装置と、
前記無線伝送路と前記光伝送路から信号を受信する受信装置と、
を含む通信システムであって、
前記送信装置は、
光変調信号と光トーン信号を含む光信号を受信する受信手段と、
前記光信号を第１光信号と第２光信号に分岐する分岐手段と、
前記第１光信号を前記光伝送路に送信する第１送信手段と、
前記第２光信号に含まれる前記光変調信号と前記光トーン信号とをまとめて光電変換し、前記光変調信号と前記光トーン信号との周波数差の周波数の第１電気変調信号を生成する生成手段と、
前記第１電気変調信号を無線信号に変換して前記無線伝送路に送信する第２送信手段と、
を備えており、
前記受信装置は、
前記光伝送路から前記第１光信号を受信する第１受信手段と、
前記無線伝送路から前記無線信号を受信し、前記無線信号を前記第１電気変調信号に変換する第２受信手段と、
前記第１光信号に含まれる前記光変調信号と前記光トーン信号とをまとめて光電変換し、前記光変調信号と前記光トーン信号との周波数差の周波数の第２電気変調信号を出力する出力手段と、
前記第１電気変調信号又は前記第２電気変調信号を復調する復調手段と、
を備え、
前記第１電気変調信号の周波数及び変調方式は、それぞれ、前記第２電気変調信号の周波数及び変調方式と同じであることを特徴とする通信システム。 A transmission device for transmitting signals to a wireless transmission line and an optical transmission line;
A receiver for receiving signals from the wireless transmission path and the optical transmission path;
A communication system comprising:
The transmitter is
Receiving means for receiving an optical signal including an optical modulation signal and an optical tone signal;
Branching means for branching the optical signal into a first optical signal and a second optical signal;
First transmission means for transmitting the first optical signal to the optical transmission line;
Generation of the first optical modulation signal having a frequency difference between the optical modulation signal and the optical tone signal by photoelectrically converting the optical modulation signal and the optical tone signal included in the second optical signal together Means,
Second transmission means for converting the first electrical modulation signal into a radio signal and transmitting the radio signal to the radio transmission path;
With
The receiving device is:
First receiving means for receiving the first optical signal from the optical transmission line;
Second receiving means for receiving the radio signal from the radio transmission path and converting the radio signal into the first electric modulation signal;
An output that collectively photoelectrically converts the optical modulation signal and the optical tone signal included in the first optical signal and outputs a second electrical modulation signal having a frequency difference between the optical modulation signal and the optical tone signal. Means,
Demodulation means for demodulating the first electrical modulation signal or the second electrical modulation signal;
Equipped with a,
The frequency and modulation method of the first electric modulation signal are the same as the frequency and modulation method of the second electric modulation signal, respectively .
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