JP7792893B2 - Optical receiving device - Google Patents
Optical receiving deviceInfo
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Description
本開示は、光通信システムの光受信装置に関する。 This disclosure relates to an optical receiving device for an optical communication system.
光伝送路には光ファイバ同士を接続するための複数の接続点が存在する。光ファイバ同士は、光コネクタや、融着により接続される。この接続点において、光送信装置から光受信装置に送信される変調光の一部は、光送信装置に向けて反射される。光送信装置に向けて反射された変調光の一部は、さらに、別の接続点において光受信装置に向けて反射され得る。光送信装置は、送信した変調光とは逆向きに伝搬される光を阻止するアイソレータ等を有するため、反射した変調光が光送信装置に到達しても問題はない。一方、光受信装置は、光伝送路において反射することなく光受信装置に到達した変調光（以下、直接光と表記する）と、光伝送路において偶数回だけ反射して光受信装置に到達した変調光（以下、反射光と表記する）と、を含む受信光を受光する。直接光と反射光の伝搬遅延は異なるため、反射光は直接光の干渉光となり、直接光の復調に影響を与える。 Optical transmission paths have multiple connection points for connecting optical fibers. Optical fibers are connected using optical connectors or fusion splices. At these connection points, a portion of the modulated light transmitted from the optical transmitter to the optical receiver is reflected toward the optical transmitter. The portion of the modulated light reflected toward the optical transmitter may then be reflected toward the optical receiver at another connection point. Because the optical transmitter includes an isolator or other device that blocks light propagating in the opposite direction to the transmitted modulated light, there is no problem if the reflected modulated light reaches the optical transmitter. Meanwhile, the optical receiver receives received light that includes modulated light that reaches the optical receiver without being reflected along the optical transmission path (hereinafter referred to as "direct light") and modulated light that reaches the optical receiver after reflecting an even number of times along the optical transmission path (hereinafter referred to as "reflected light"). Because the propagation delays of direct light and reflected light are different, the reflected light acts as interference light for the direct light, affecting the demodulation of the direct light.
特許文献１及び非特許文献１は、干渉光の影響を抑えるためにディザリングを行う構成を開示している。具体的には、非特許文献１は、ディザリング専用の位相変調器を使用する構成を開示している。また、特許文献１は、情報を搬送する信号とディザリング用の信号の両方の信号で光源を駆動して変調光を生成する構成を開示している。 Patent Document 1 and Non-Patent Document 1 disclose configurations that use dithering to suppress the effects of interference light. Specifically, Non-Patent Document 1 discloses a configuration that uses a phase modulator dedicated to dithering. Patent Document 1 also discloses a configuration that generates modulated light by driving a light source with both a signal carrying information and a signal for dithering.
しかしながら、ディザリングを使用することなく、より簡易な方法で反射光の影響を抑えることが求められる。 However, there is a need for a simpler method to reduce the effects of reflected light without using dithering.
本開示は、簡易な方法で反射光の影響を抑える技術を提供するものである。 This disclosure provides a simple technique for reducing the effects of reflected light.
本発明の一態様によると、光送信装置が情報を搬送する電気信号でキャリア光を強度変調することにより生成して光伝送路に送信した変調光であって、前記キャリア光に対応するキャリア成分と、前記電気信号に対応する側波帯成分と、を含む前記変調光を、前記光伝送路から受信光として受信する光受信装置は、前記受信光に含まれる前記キャリア成分を抑圧した第１光を出力するする出力手段と、ローカル光を生成する光源と、前記ローカル光と前記第１光を合波して第２光を出力する合波手段と、前記第２光の光電変換を行う光電変換手段と、を備えている。 According to one aspect of the present invention, an optical receiving device receives modulated light from an optical transmission line as received light. The modulated light is generated by an optical transmitting device by intensity-modulating carrier light with an electrical signal carrying information and transmitted to the optical transmission line. The modulated light includes a carrier component corresponding to the carrier light and a sideband component corresponding to the electrical signal. The optical receiving device includes: an output means for outputting first light in which the carrier component included in the received light is suppressed; a light source for generating local light; a multiplexing means for multiplexing the local light and the first light and outputting second light; and a photoelectric conversion means for performing photoelectric conversion on the second light.
本開示によると、簡易な方法で反射光の影響を抑えることができる。 This disclosure provides a simple method for reducing the effects of reflected light.
以下、添付図面を参照して実施形態を詳しく説明する。なお、以下の実施形態は特許請求の範囲に係る発明を限定するものではなく、また実施形態で説明されている特徴の組み合わせの全てが発明に必須のものとは限らない。実施形態で説明されている複数の特徴のうちの二つ以上の特徴が任意に組み合わされてもよい。また、同一若しくは同様の構成には同一の参照番号を付し、重複した説明は省略する。 The following embodiments are described in detail with reference to the accompanying drawings. Note that the following embodiments do not limit the scope of the claimed invention, and not all combinations of features described in the embodiments are necessarily essential to the invention. Two or more of the features described in the embodiments may be combined in any desired manner. Furthermore, the same reference numbers are used for identical or similar components, and duplicate descriptions will be omitted.
＜第一実施形態＞
図１は、本実施形態による光通信システムの構成図である。光送信装置１と光受信装置２とは、光伝送路３を介して接続される。光伝送路３は、複数の接続点（反射点）を有する。光送信装置１は、情報を搬送する電気信号（以下、情報信号）でキャリア光を強度変調して変調光を生成し、変調光を光受信装置２に送信する。光受信装置２は、変調光を復調して情報信号を生成するために、光伝送路３を介して受信する受信光の直接検波を行う。つまり、光受信装置２は、情報信号を生成するために受信光の光電変換を行って電気信号を出力する。
First Embodiment
1 is a configuration diagram of an optical communication system according to this embodiment. An optical transmitter 1 and an optical receiver 2 are connected via an optical transmission path 3. The optical transmission path 3 has multiple connection points (reflection points). The optical transmitter 1 generates modulated light by intensity-modulating carrier light with an electrical signal carrying information (hereinafter referred to as an information signal), and transmits the modulated light to the optical receiver 2. The optical receiver 2 performs direct detection of the received light received via the optical transmission path 3 to demodulate the modulated light and generate an information signal. That is, the optical receiver 2 performs photoelectric conversion of the received light to generate the information signal, and outputs an electrical signal.
図２は、光送信装置１が生成して光伝送路３に出力する変調光の周波数成分を示している。以下では、キャリア光の周波数をｆｃとし、情報信号の中心周波数をｆｄとする。図２おいて、参照符号９０は、キャリア光に対応するキャリア成分であり、参照符号９１は、情報信号に対応する下側波帯成分であり、参照符号９２は、情報信号に対応する上側波帯成分である。 Figure 2 shows the frequency components of modulated light generated by optical transmitter 1 and output to optical transmission path 3. Below, the frequency of the carrier light is denoted as fc, and the center frequency of the information signal is denoted as fd. In Figure 2, reference numeral 90 denotes the carrier component corresponding to the carrier light, reference numeral 91 denotes the lower sideband component corresponding to the information signal, and reference numeral 92 denotes the upper sideband component corresponding to the information signal.
光伝送路３に複数の反射点が存在する場合、光受信装置２が受信する受信光は、光伝送路３において反射することなく光受信装置２に到達した変調光である直接光と、偶数個の反射点での反射後に光受信装置２に到達した変調光である反射光と、を合成したものとなる。なお、受信光に含まれる反射光は１つではなく、反射位置の異なる複数の反射光が含まれ得る。例えば、光伝送路３に第１反射点～第３反射点の３つの反射点が存在する場合、受信光は、第１反射点及び第２反射点で反射した第１反射光と、第１反射点及び第３反射点で反射した第２反射光と、第２反射点及び第３反射点で反射した第３反射光の３つの反射光と、を含み得る。なお、第１反射光～第３反射光それぞれの伝搬遅延は異なり得る。さらに、光伝送路３に４つの反射点が存在する場合、受信光は、４つの反射点で反射した反射光も含み得る。 When multiple reflection points exist on the optical transmission path 3, the received light received by the optical receiving device 2 is a combination of direct light, which is modulated light that reaches the optical receiving device 2 without being reflected on the optical transmission path 3, and reflected light, which is modulated light that reaches the optical receiving device 2 after being reflected at an even number of reflection points. The received light may contain more than one reflected light, but may contain multiple reflected lights reflected at different positions. For example, when three reflection points, first to third reflection points, exist on the optical transmission path 3, the received light may contain three reflected lights: first reflected light reflected at the first and second reflection points, second reflected light reflected at the first and third reflection points, and third reflected light reflected at the second and third reflection points. The propagation delays of the first to third reflected lights may differ. Furthermore, when four reflection points exist on the optical transmission path 3, the received light may also contain reflected light reflected at all four reflection points.
したがって、光受信装置２における受信光の直接検波により出力される電気信号には、それぞれが伝搬遅延の異なる変調光の各成分間のビートに対応する信号が含まれる。情報信号は、直接光に含まれるキャリア成分９０と直接光に含まれる側波帯成分とのビートに対応する信号であり、それ以外の成分間のビートに対応する信号は、情報信号に対する雑音成分（又は干渉成分）となる。ここで、通常、変調光に含まれるキャリア成分９０のレベルは、下側波帯成分９１及び上側波帯成分９２のレベルより大きいため、支配的な雑音成分は、１つ以上の反射光それぞれに含まれるキャリア成分９０が関与するビートに対応する成分となる。 Therefore, the electrical signal output by direct detection of the received light in the optical receiving device 2 includes signals corresponding to the beats between the components of the modulated light, each of which has a different propagation delay. The information signal is a signal corresponding to the beats between the carrier component 90 contained in the direct light and the sideband components contained in the direct light, while signals corresponding to the beats between other components are noise components (or interference components) relative to the information signal. Here, since the level of the carrier component 90 contained in the modulated light is typically greater than the levels of the lower sideband component 91 and the upper sideband component 92, the dominant noise components are components corresponding to the beats involving the carrier component 90 contained in each of one or more reflected lights.
このため、本実施形態において、光受信装置２は、受信光に含まれるキャリア成分を除去し、光受信装置において生成したキャリア光であるローカル光の成分と、受信光に含まれる下側波帯成分９１及び上側波帯成分９２とを含む光の光電変換を行うことで雑音成分を抑圧する。 For this reason, in this embodiment, the optical receiving device 2 removes the carrier component contained in the received light and suppresses the noise component by performing photoelectric conversion of light containing the local light component, which is the carrier light generated in the optical receiving device, and the lower sideband component 91 and upper sideband component 92 contained in the received light.
図３は、本実施形態による光受信装置２の構成図である。フィルタ部２１には、光伝送路３からの受信光が入力される。図４（Ａ）は、受信光の周波数成分を示している。受信光は、キャリア成分８０と、下側波帯成分８１と、上側波帯成分８２と、を含む。なお、キャリア成分８０は、直接光に含まれるキャリア成分９０と、１つ以上の反射光に含まれるキャリア成分９０と、を合波したものに対応する。同様に、下側波帯成分８１は、直接光に含まれる下側波帯成分９１と、１つ以上の反射光に含まれる下側波帯成分９１と、を合波したものに対応し、上側波帯成分８２は、直接光に含まれる上側波帯成分９２と、１つ以上の反射光に含まれる上側波帯成分９２と、を合波したものに対応する。 Figure 3 is a configuration diagram of an optical receiving device 2 according to this embodiment. Received light from the optical transmission path 3 is input to the filter section 21. Figure 4 (A) shows the frequency components of the received light. The received light includes a carrier component 80, a lower sideband component 81, and an upper sideband component 82. Note that the carrier component 80 corresponds to the combination of a carrier component 90 contained in the direct light and a carrier component 90 contained in one or more reflected lights. Similarly, the lower sideband component 81 corresponds to the combination of a lower sideband component 91 contained in the direct light and a lower sideband component 91 contained in one or more reflected lights, and the upper sideband component 82 corresponds to the combination of an upper sideband component 92 contained in the direct light and an upper sideband component 92 contained in one or more reflected lights.
フィルタ部２１は、帯域阻止フィルタであり、受信光に含まれるキャリア成分８０を抑圧し、下側波帯成分８１と、上側波帯成分８２と、を含む光を出力する。図４（Ｂ）は、フィルタ部２１が出力する光の周波数成分を示している。フィルタ部２１が出力する光は、加算部２３に入力される。なお、オプションの偏波制御部２４が設けられている場合、フィルタ部２１が出力する光は、偏波制御部２４を介して加算部２３に入力される。オプションの偏波制御部２４は、フィルタ部２１が出力する光の偏波を調整する。 The filter unit 21 is a band-elimination filter that suppresses the carrier component 80 contained in the received light and outputs light containing a lower sideband component 81 and an upper sideband component 82. Figure 4(B) shows the frequency components of the light output by the filter unit 21. The light output by the filter unit 21 is input to the adder unit 23. If the optional polarization control unit 24 is provided, the light output by the filter unit 21 is input to the adder unit 23 via the polarization control unit 24. The optional polarization control unit 24 adjusts the polarization of the light output by the filter unit 21.
一方、光源２２は、周波数ｆｃのローカル光を生成する。周波数ｆｃのローカル光は加算部２３に入力される。なお、オプションの偏波制御部２５が設けられている場合は、周波数ｆｃのローカル光は、偏波制御部２５を介して加算部２３に入力される。オプションの偏波制御部２５は、ローカル光の偏波を調整する。 Meanwhile, the light source 22 generates local light of frequency fc. The local light of frequency fc is input to the adder 23. If the optional polarization control unit 25 is provided, the local light of frequency fc is input to the adder 23 via the polarization control unit 25. The optional polarization control unit 25 adjusts the polarization of the local light.
加算部２３は、フィルタ部２１が出力する光と、ローカル光と、を合波する。図４（Ｃ）は、加算部２３が出力する光の周波数成分を示している。図４（Ｃ）において、参照符号７０は、ローカル光に対応するキャリア成分７０である。光電変換部２６は、図４（Ｃ）に示す光の光電変換を行って電気信号を出力する。 The adder 23 combines the light output by the filter 21 with the local light. Figure 4(C) shows the frequency components of the light output by the adder 23. In Figure 4(C), reference numeral 70 denotes a carrier component 70 corresponding to the local light. The photoelectric converter 26 performs photoelectric conversion on the light shown in Figure 4(C) and outputs an electrical signal.
なお、オプションの偏波制御部２４及び２５は、加算部２３に入力されるローカル光と、フィルタ部２１からの光の偏波面を一致させるために設けられる。加算部２３に入力されるローカル光と、フィルタ部２１からの光の偏波面を一致させることで、光電変換部２３が出力する、キャリア成分７０と、下側波帯成分８１／上側波帯成分８２とのビートに対応する信号のレベルが低くなることを防ぐことができる。なお、偏波面を一致させる様に制御する場合であっても、偏波制御部２４及び２５の内の１つのみを設ける構成とすることができる。 The optional polarization control units 24 and 25 are provided to align the polarization plane of the local light input to the adder 23 with that of the light from the filter unit 21. By aligning the polarization plane of the local light input to the adder 23 with that of the light from the filter unit 21, it is possible to prevent a decrease in the level of the signal output by the photoelectric conversion unit 23, which corresponds to the beat between the carrier component 70 and the lower sideband component 81/upper sideband component 82. Even when controlling to align the polarization planes, it is possible to configure the system with only one of the polarization control units 24 and 25.
以上、光受信装置２において、１つ以上の反射光を含む受信光のキャリア成分８０を抑圧し、ローカル光と、受信光に含まれる下側波帯成分８１及び上側波帯成分８２と、を含む光の直接検波を行う。この構成により、キャリア成分８０に含まれる１つ以上の反射光のキャリア成分９０により生じる雑音成分を抑圧することができる。 As described above, the optical receiving device 2 suppresses the carrier component 80 of the received light, which includes one or more reflected light beams, and performs direct detection of light, which includes the local light and the lower sideband component 81 and upper sideband component 82, contained in the received light. This configuration makes it possible to suppress noise components caused by the carrier component 90 of one or more reflected light beams contained in the carrier component 80.
なお、本実施形態では、フィルタ部２１においてキャリア成分８０のみを抑圧していたが、さらに、下側波帯成分８１及び上側波帯成分８２の内のいずれか１つを抑圧する構成であっても良い。この場合、フィルタ部２１は、帯域阻止フィルタではなく、低域通過フィルタ又は高域通過フィルタになる。さらに、本実施形態において、光送信装置１が光伝送路３に出力する変調光は、キャリア成分９０に加えて、両方の側波帯成分、つまり、下側波帯成分９１及び上側波帯成分９２を含むものであった。しかしながら、変調光は、下側波帯成分９１及び上側波帯成分９２の内のいずれか１つと、キャリア成分９０と、を含むものであっても良い。 In this embodiment, the filter unit 21 suppresses only the carrier component 80. However, it may also be configured to suppress either the lower sideband component 81 or the upper sideband component 82. In this case, the filter unit 21 is a low-pass filter or a high-pass filter, rather than a band-stop filter. Furthermore, in this embodiment, the modulated light output from the optical transmitter 1 to the optical transmission path 3 includes both sideband components, i.e., the lower sideband component 91 and the upper sideband component 92, in addition to the carrier component 90. However, the modulated light may also include either the lower sideband component 91 or the upper sideband component 92, and the carrier component 90.
＜第二実施形態＞
続いて、第二実施形態について第一実施形態との相違点を中心に説明する。第一実施形態において、光源２２は、光送信装置１が生成するキャリア光と同じ周波数ｆｃのローカル光を生成していた。フィルタ部２１を帯域阻止フィルタとし、下側波帯成分８１及び上側波帯成分８２を含む光を加算部２３に出力する場合、光源２２が生成するローカル光の周波数は、光送信装置１が生成するキャリア光と同じ周波数ｆｃとする必要がある。しかしながら、第一実施形態で述べた、下側波帯成分８１及び上側波帯成分８２の内のいずれか１つを加算部２３に出力する場合、光源２２が生成するローカル光の周波数については任意に設定し得る。
Second Embodiment
Next, the second embodiment will be described, focusing on the differences from the first embodiment. In the first embodiment, the light source 22 generated local light having the same frequency fc as the carrier light generated by the optical transmitting device 1. When the filter unit 21 is a band-stop filter and light including a lower sideband component 81 and an upper sideband component 82 is output to the adder unit 23, the frequency of the local light generated by the light source 22 must be the same frequency fc as the carrier light generated by the optical transmitting device 1. However, when outputting either the lower sideband component 81 or the upper sideband component 82 to the adder unit 23 as described in the first embodiment, the frequency of the local light generated by the light source 22 can be set arbitrarily.
例えば、図５（Ａ）は、図４（Ａ）と同じであり、受信光の周波数成分を示している。そして、図５（Ｂ）に示す様に、フィルタ部２１を高域通過フィルタとし、上側波帯成分８２を加算部２３に出力する場合、光源２２が生成するローカル光の周波数を周波数ｆｃとは異なる周波数ｆｌとすることができる。したがって、光電変換部２６は、図５（Ｃ）に示す周波数成分を有する光の光電変換を行う。この場合、キャリア成分７１と、上側波帯成分８２とのビートにより生じる信号の中心周波数は周波数ｆｌと周波数（ｆｃ＋ｆｄ）との差に対応し、周波数ｆｌにより電気信号の中心周波数を制御することができる。例えば、電気信号の中心周波数を無線周波数帯の信号にすることで、レディオ・オーバ・ファイバ（ＲｏＦ）システムとすることができる。なお、本実施形態では、フィルタ部２１において、キャリア成分８０に加えて、２つの側波帯成分の内の１つを抑圧するものとしたが、光送信装置１が、２つの側波帯成分の内の１つを抑圧して送信する構成であっても良い。 For example, Figure 5(A) is the same as Figure 4(A) and shows the frequency components of the received light. As shown in Figure 5(B), when the filter unit 21 is a high-pass filter and the upper sideband component 82 is output to the adder unit 23, the frequency of the local light generated by the light source 22 can be set to frequency f1, which is different from frequency fc. Therefore, the photoelectric conversion unit 26 performs photoelectric conversion of light having the frequency components shown in Figure 5(C). In this case, the center frequency of the signal generated by the beat between the carrier component 71 and the upper sideband component 82 corresponds to the difference between frequency f1 and frequency (fc + fd), and the center frequency of the electrical signal can be controlled by frequency f1. For example, by setting the center frequency of the electrical signal to a radio frequency band signal, a radio-over-fiber (RoF) system can be realized. In this embodiment, the filter section 21 suppresses one of the two sideband components in addition to the carrier component 80, but the optical transmitting device 1 may also be configured to suppress one of the two sideband components before transmitting.
＜第三実施形態＞
続いて、第三実施形態について第一実施形態との相違点を中心に説明する。第一実施形態において、光源２２は、ローカル光を光送信装置１が生成するキャリア光とは無関係に生成していた。本実施形態において、光源２２は、光送信装置１からのキャリア光の注入同期によりローカル光を生成する。
Third Embodiment
Next, the third embodiment will be described, focusing on the differences from the first embodiment. In the first embodiment, the light source 22 generated the local light independently of the carrier light generated by the optical transmitter 1. In this embodiment, the light source 22 generates the local light by injection locking the carrier light from the optical transmitter 1.
図６は、本実施形態による光受信装置２の構成図である。なお、図６では、図３に示す構成と同様の構成要素には同じ参照符号を付与し、その説明については基本的に省略する。分離部２７は、受信光に含まれる成分の分離を行い、キャリア成分８０に対応する光を光源２２に出力し、側波帯成分に対応する光を加算部２３（オプションの偏波制御部２４が設けられている場合には偏波制御部２４）に出力する。なお、加算部２３に出力する光に含まれる側波帯成分は、第一実施形態で説明した様に、下側波帯成分８１と上側波帯成分８２の両方であっても、いずれか一方のみであっても良い。 Figure 6 is a configuration diagram of an optical receiving device 2 according to this embodiment. Note that in Figure 6, components similar to those in the configuration shown in Figure 3 are assigned the same reference numerals, and their description will generally be omitted. The separator 27 separates the components contained in the received light, outputs light corresponding to the carrier component 80 to the light source 22, and outputs light corresponding to the sideband components to the adder 23 (or the polarization controller 24 if the optional polarization controller 24 is provided). Note that, as described in the first embodiment, the sideband components contained in the light output to the adder 23 may be both the lower sideband component 81 and the upper sideband component 82, or only one of them.
光源２２は、注入同期光源であり、キャリア成分８０を含む光にロックして周波数ｆｃのローカル光を生成する。この様に、光源２２が生成するローカル光をキャリア成分８０に基づき生成することで、ローカル光の周波数が側波帯成分の周波数に対して変動することによる雑音成分を抑えることができる。なお、キャリア成分８０は、直接光のキャリア成分９０と、１つ以上の反射光のキャリア成分９０と、を含むものであるが注入同期には影響がない。 Light source 22 is an injection-locked light source that locks to light containing carrier component 80 to generate local light of frequency fc. In this way, by generating the local light generated by light source 22 based on carrier component 80, noise components caused by fluctuations in the frequency of the local light relative to the frequency of the sideband components can be suppressed. Note that carrier component 80 includes carrier component 90 of the direct light and carrier components 90 of one or more reflected lights, but this does not affect injection locking.
以上の構成により、簡易な方法で反射光の影響を抑えることができる。したがって、国連が主導する持続可能な開発目標（ＳＤＧｓ）の目標９「レジリエントなインフラを整備し、持続可能な産業化を推進するとともに、イノベーションの拡大を図る」に貢献することが可能となる。 The above configuration provides a simple method for reducing the effects of reflected light. This will contribute to achieving Goal 9 of the United Nations' Sustainable Development Goals (SDGs), which states, "Build resilient infrastructure, promote sustainable industrialization and foster innovation."
発明は上記の実施形態に制限されるものではなく、発明の要旨の範囲内で、種々の変形・変更が可能である。 The invention is not limited to the above-described embodiments, and various modifications and variations are possible within the scope of the invention.
２１：フィルタ部、２２：光源、２３：加算部、２６：光電変換部 21: Filter section, 22: Light source, 23: Adder section, 26: Photoelectric conversion section
Claims (10)
前記受信光に含まれる前記キャリア成分を抑圧した第１光を出力するする出力手段と、
ローカル光を生成する光源と、
前記ローカル光と前記第１光を合波して第２光を出力する合波手段と、
前記第２光の光電変換を行う光電変換手段と、
を備えている光受信装置。 An optical receiving device receives modulated light from an optical transmission line as received light, the modulated light being generated by an optical transmitting device by intensity-modulating a carrier light with an electrical signal carrying information and transmitted to an optical transmission line, the modulated light including a carrier component corresponding to the carrier light and a sideband component corresponding to the electrical signal,
an output unit for outputting a first light in which the carrier component contained in the received light is suppressed;
a light source that generates local light;
a multiplexing unit that multiplexes the local light and the first light and outputs a second light;
a photoelectric conversion means for performing photoelectric conversion of the second light;
An optical receiving device comprising:
前記光源は、前記第３光を入力として注入同期を行う光源である、請求項２に記載の光受信装置。 the output means is a separation means that separates the first light from the third light containing the carrier component,
3. The optical receiving device according to claim 2, wherein the light source is a light source that performs injection locking using the third light as an input.
前記出力手段が出力する前記第１光は、前記側波帯成分を含む、請求項２に記載の光受信装置。 the sideband component included in the modulated light is only one of an upper sideband component and a lower sideband component,
3. The optical receiving device according to claim 2, wherein the first light output by the output means includes the sideband component.
前記出力手段が出力する前記第１光は、前記上側波帯成分及び前記下側波帯成分を含む、請求項２に記載の光受信装置。 the sideband components included in the modulated light are an upper sideband component and a lower sideband component,
3. The optical receiving device according to claim 2, wherein the first light output by the output means includes the upper sideband component and the lower sideband component.
前記出力手段が出力する前記第１光は、前記上側波帯成分及び前記下側波帯成分の内の一方のみを含む、請求項２に記載の光受信装置。 the sideband components included in the modulated light are an upper sideband component and a lower sideband component,
3. The optical receiving device according to claim 2, wherein the first light output by the output means includes only one of the upper sideband component and the lower sideband component.
前記出力手段が出力する前記第１光は、前記側波帯成分を含み、
前記ローカル光の周波数は、前記キャリア光の周波数とは異なる、請求項１に記載の光受信装置。 the sideband component included in the modulated light is one of an upper sideband component and a lower sideband component,
the first light output by the output means includes the sideband component,
2. The optical receiving device according to claim 1, wherein the frequency of the local light is different from the frequency of the carrier light.
前記出力手段が出力する前記第１光は、前記上側波帯成分及び前記下側波帯成分の内の一方のみを含み、
前記ローカル光の周波数は、前記キャリア光の周波数とは異なる、請求項１に記載の光受信装置。 the sideband components included in the modulated light are an upper sideband component and a lower sideband component,
the first light output by the output means includes only one of the upper sideband component and the lower sideband component,
2. The optical receiving device according to claim 1, wherein the frequency of the local light is different from the frequency of the carrier light.
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