JP4731598B2 - Optical receiver - Google Patents
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- JP4731598B2 JP4731598B2 JP2008308977A JP2008308977A JP4731598B2 JP 4731598 B2 JP4731598 B2 JP 4731598B2 JP 2008308977 A JP2008308977 A JP 2008308977A JP 2008308977 A JP2008308977 A JP 2008308977A JP 4731598 B2 JP4731598 B2 JP 4731598B2
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Description
本発明は例えばＣＡＴＶシステムに使用するのに適する光受信装置に関する。 The present invention relates to an optical receiver suitable for use in, for example, a CATV system.
近年、ＣＡＴＶシステムには光伝送システムが多用されている。光伝送システムの受信側では受信した光信号をフォトダイオードで光／電気変換してＲＦ信号を取り出している。この種の光受信装置として下記特許文献のようなものがある。 In recent years, optical transmission systems are frequently used for CATV systems. On the receiving side of the optical transmission system, the received optical signal is optically / electrically converted by a photodiode to extract an RF signal. As this type of optical receiving apparatus, there is one as described in the following patent document.
特許文献では受信した光信号をフォトダイオードで光／電気変換してＲＦ信号を取り出している。 In the patent document, the received optical signal is photoelectrically / electrically converted by a photodiode to extract an RF signal.
特許文献では商用電源が停電するとＲＦ信号が出力されず、無給電時にＲＦ信号を出力するためにはフォトダイオードのアノード端子とカソード端子を高周波トランスや抵抗、コイルを介して接地しなければならない。また、フォトダイオードを給電状態と無給電状態に切り換えるためには給電ラインに切換スイッチ（例えば、特許文献１図６のリレー）を必要とするためコスト高になる。また、切換スイッチは給電ラインへの接続ではあるが、切換スイッチを実装すると、ＢＳ／ＣＳ帯域まで対応した光受信器の場合は高周波特性に悪影響を与える虞がある。 In the patent document, when a commercial power supply fails, an RF signal is not output, and in order to output an RF signal when no power is supplied, the anode terminal and the cathode terminal of the photodiode must be grounded via a high-frequency transformer, a resistor, and a coil. Further, in order to switch the photodiode between the power supply state and the non-power supply state, a changeover switch (for example, the relay shown in FIG. 6 of Patent Document 1) is required in the power supply line, resulting in high cost. Although the changeover switch is connected to the power supply line, if the changeover switch is mounted, there is a possibility that the high frequency characteristics may be adversely affected in the case of an optical receiver that supports up to the BS / CS band.
本発明は商用電源の停電時でも電池などのバックアップ用電源を持たずに、受信した光信号を電気信号に変換してＲＦ信号を出力可能とした光受信装置に関するものである。 The present invention relates to an optical receiver capable of converting a received optical signal into an electrical signal and outputting an RF signal without having a backup power source such as a battery even during a power failure of a commercial power source.
本発明の光受信装置は、請求項１記載のように、光信号を電気信号に変換してＲＦ信号を取り出す光受信装置において、前記光信号を光／電気変換するフォトダイオードと、前記光受信装置への給電時に、前記フォトダイオードに逆電圧を印加するバイアス電源と、前記フォトダイオードのカソード側に設けられた給電時出力伝送路と、前記フォトダイオードのアノード側に設けられた無給電時出力伝送路と、前記給電時出力伝送路に設けられたデプレッション型ＦＥＴが使用された高周波増幅器と、を備え、前記フォトダイオードは、カソード側がチョークコイルを介してバイアス電源と接続され、アノード側が抵抗を介して接地され、前記高周波増幅器で使用されたデプレッション型ＦＥＴは、前記ゲート端子がコンデンサを介して前記フォトダイオードのカソード側に接続され、ドレイン端子がチョークコイルを介して前記バイアス電源と接続され、ソース端子が接地され、前記光受信装置への給電時には、前記フォトダイオードが光信号を電気信号に変換してＲＦ信号が取り出され、前記ＲＦ信号が前記デプレッション型ＦＥＴのゲート端子に入力され、当該デプレッション型ＦＥＴで増幅されて前記給電時出力伝送路の出力側に伝送され、前記光受信装置への無給電時には、前記デプレッション型ＦＥＴのドレイン−ソース端子間が接地されることにより、前記フォトダイオードのカソード側が前記デプレッション型ＦＥＴを介して接地されて、光信号がフォトダイオードにより電気信号に変換されてＲＦ信号が取り出され、当該ＲＦ信号がフォトダイオードのアノード側から前記無給電時出力伝送路に出力されるものである。 According to another aspect of the present invention, there is provided an optical receiver that converts an optical signal into an electrical signal and extracts an RF signal, and a photodiode that performs optical / electrical conversion of the optical signal, and the optical receiver. A bias power supply that applies a reverse voltage to the photodiode when power is supplied to the device, an output transmission path that is provided on the cathode side of the photodiode, and an unpowered output that is provided on the anode side of the photodiode A high-frequency amplifier using a depletion type FET provided in the power transmission output transmission line, and the photodiode has a cathode side connected to a bias power source via a choke coil, and an anode side having a resistance. The depletion type FET used in the high frequency amplifier is grounded through the gate terminal via the capacitor. Connected to the cathode side of the photodiode, the drain terminal is connected to the bias power supply via a choke coil, the source terminal is grounded, and when supplying power to the optical receiver, the photodiode converts the optical signal into an electrical signal. The RF signal is extracted, and the RF signal is input to the gate terminal of the depletion type FET, amplified by the depletion type FET, transmitted to the output side of the power transmission output transmission path, and transmitted to the optical receiver. At the time of power feeding, the drain-source terminal of the depletion type FET is grounded, so that the cathode side of the photodiode is grounded via the depletion type FET, and the optical signal is converted into an electric signal by the photodiode and RF. The signal is extracted and the RF signal is the anode of the photodiode It is intended to be output to the passive time of output transmission line from.
本発明の光受信装置は、請求項１記載の光受信装置において、無給電時出力伝送路に告知端末装置を備えて、無給電時出力伝送路に出力されるＲＦ信号中の告知放送を前記告知端末装置で受信できるものとすることができる。 The optical receiver according to the present invention is the optical receiver according to claim 1 , further comprising a notification terminal device in the output transmission path when no power is supplied, and the notification broadcast in the RF signal output to the output transmission path when no power is supplied. It can be received by the notification terminal device .
本発明は次のような効果がある。
（１）給電時には、光信号が光／電気変換されて得られたＲＦ信号がデバイスで増幅されて給電時出力端子に出力されるので、ＲＦ信号を確実に受信することができる。
（２）無給電時（商用電源停電時）には、ＲＦ信号が給電時出力端子からは出力されず、無給電時出力端子から出力されるので、無給電時であってもＲＦ信号が確実に出力され、告知放送も受信される。
The present invention has the following effects.
(1) At the time of power supply, the RF signal obtained by optical / electrical conversion of the optical signal is amplified by the device and output to the output terminal at the time of power supply, so that the RF signal can be reliably received.
(2) When there is no power supply (commercial power failure), the RF signal is not output from the power supply output terminal, but is output from the power supply output terminal. And notification broadcasts are also received.
本発明は次のような効果がある。
（１）商用電源の給電時には給電時出力端子からＲＦ信号を取り出し、商用電源の無給電時にはバックアップ用電源を搭載しなくとも無給電時出力端子からＲＦ信号を取り出すことができる。
（２）無給電時出力端子に告知端末装置が接続されている場合は、商用電源停電時でも告知放送を受信することができる。
The present invention has the following effects.
(1) An RF signal can be extracted from the output terminal during power supply when the commercial power is supplied, and an RF signal can be extracted from the output terminal when no commercial power is supplied without a backup power supply.
(2) When the notification terminal device is connected to the output terminal when no power is supplied, the notification broadcast can be received even when the commercial power supply is interrupted.
（実施形態）
本発明では、図に示す光／電気変換素子Ｄ２１のカソード側に給電時出力伝送路１が、アノード側に無給電時出力伝送路２が設けられ、給電時出力伝送路１に無給電時に導通状態になってドレインからソースに電流が流れるデバイスＩＣ２１が接続され、光信号が給電時に前記光／電気変換素子Ｄ２１で光／電気変換されるとＲＦ信号が前記デバイスＩＣ２１で増幅されて給電時出力端子ＣＮ２１に出力され、無給電時には前記ＲＦ信号が前記デバイスＩＣ２１で接地されて給電時出力端子ＣＮ２１からは出力されず、無給電時出力端子ＣＮ３２から出力されるようにしてある。
(Embodiment)
In the present invention, a power supply output transmission line 1 is provided on the cathode side of the photoelectric conversion element D21 shown in the figure, and a non-power supply
図１はデプレッション型ＦＥＴの回路図である。デプレッション型ＦＥＴ（以下単に「ＦＥＴ」という。）はゲート端子１１の電圧が微小でもドレイン電流が流れるため、無給電状態でもドレイン端子１２に電圧Ｖｄｄが発生すればＦＥＴはＯＮ状態となりソース端子１３へと電流が流れる構造になっている。
FIG. 1 is a circuit diagram of a depletion type FET. In a depletion type FET (hereinafter simply referred to as “FET”), a drain current flows even if the voltage at the
図２は本発明の光受信装置の一例であり、デバイスＩＣ２１に図１に示すデプレッション型ＦＥＴが使用された高周波増幅器（以下「高周波増幅器」という。）の場合である。図２ではフォトダイオード（ＰＤ）Ｄ２１のカソード端子がチョークコイルＬ２１を介して電源Ｖｃｃに接続され、前記高周波増幅器ＩＣ２１が前記電源ＶｃｃにチョークコイルＬ２２を介して接続されている。
FIG. 2 shows an example of the optical receiver of the present invention, which is a case of a high frequency amplifier (hereinafter referred to as “high frequency amplifier”) in which the depletion type FET shown in FIG. The cathode terminal of FIG. 2, the photodiode (PD) D21 are connected to the power supply Vcc via a choke coil L21, the high-frequency amplifier IC21 is connected through a
図２において、商用電源が供給されているときにフォトダイオードＤ２１に逆バイアスＶｃｃ（通常、商用電源をＤＣ電圧に変換して使用される）を印加すると抵抗Ｒ２１を介して電流が流れ、光信号が電気信号に変換されてＲＦ信号が出力される。そのＲＦ信号は高周波増幅器ＩＣ２１により増幅されて給電時出力端子ＣＮ２１より出力される。 In FIG. 2, when a reverse bias Vcc (usually used by converting the commercial power source into a DC voltage) is applied to the photodiode D21 when the commercial power source is supplied, a current flows through the resistor R21, and an optical signal is generated. Is converted into an electrical signal and an RF signal is output. The RF signal is amplified by the high frequency amplifier IC21 and output from the power supply output terminal CN21.
商用電源の停電時（無給電時）には図３のようにバイアス電源Ｖｃｃが０Ｖとなる。このときもフォトダイオードＤ２１は受信した光信号の光強度に応じた電圧を発生する。ＦＥＴは無給電時であても図５のように導通状態になってドレインからソースに電流が流れるため、フォトダイオードＤ２１から発生した電圧はチョークコイルＬ２１、Ｌ２２を介してＦＥＴで構成される高周波増幅器ＩＣ２１を通り、電流が流れる。これにより、フォトダイオードＤ２１は光信号を電気信号に変換し、ＲＦ信号を出力し、それが無給電時出力端子ＣＮ３２から出力される。この場合、図４のように出力端子ＣＮ３２に例えば告知端末装置を接続しておけば、商用電源停電時でも緊急告知を受信することができる。なお、告知端末装置はバックアップ電源を備えている。 At the time of a power failure of the commercial power supply (when no power is supplied), the bias power supply Vcc becomes 0V as shown in FIG. Also at this time, the photodiode D21 generates a voltage corresponding to the light intensity of the received optical signal. Since the FET is in a conducting state as shown in FIG. 5 even when no power is supplied, and a current flows from the drain to the source, the voltage generated from the photodiode D21 is a high-frequency amplifier composed of the FET via the choke coils L21 and L22. A current flows through the IC 21. As a result, the photodiode D21 converts the optical signal into an electrical signal and outputs an RF signal, which is output from the non-powered output terminal CN32. In this case, if, for example, a notification terminal device is connected to the output terminal CN32 as shown in FIG. 4, an emergency notification can be received even during a commercial power failure. The notice terminal device has a backup power source.
図２〜図４では、給電時出力端子ＣＮ２１にテレビ受像機ＴＶ、セットトップボックスＳＴＢとテレビ受像機ＴＶを接続し、無給電時出力端子ＣＮ３２に告知端末装置を接続してあるが、必要であれば、無給電時出力端子ＣＮ３２にもテレビ受像機（ＴＶ）、セットトップボックス（ＳＴＢ）とテレビ受像機（ＴＶ）を接続することもできる。コンデンサＣ２１、Ｃ２２、Ｃ２３はＤＣカット用コンデンサである。 2 to 4, the TV receiver TV, the set top box STB and the TV receiver TV are connected to the power supply output terminal CN21, and the notification terminal device is connected to the non-power supply output terminal CN32. If present, the television receiver (TV), the set top box (STB), and the television receiver (TV) can be connected to the output terminal CN32 when no power is supplied. Capacitors C21, C22, and C23 are DC cut capacitors.
本願発明の光受信装置は、ＣＡＴＶシステムのみならず、他の光伝送システムの光伝送装置にも利用可能である。 The optical receiver of the present invention can be used not only for CATV systems but also for optical transmission devices of other optical transmission systems.
１ 給電時出力伝送路
２ 無給電時出力伝送路
１１ デプレッション型ＦＥＴのゲート端子
１２ デプレッション型ＦＥＴのドレイン端子
１３ ソース端子
ＩＣ２１ デバイス（デプレッション型ＦＥＴを使用した高周波増幅器）
Ｄ２１ フォトダイオード
Ｌ２１ チョークコイル
Ｌ２２ チョークコイル
Ｃ２１ コンデンサ
Ｃ２２ コンデンサ
Ｃ２３ コンデンサ
Ｒ２１ 抵抗
ＣＮ２１ 給電時出力端子
ＣＮ３２ 無給電時出力端子
Ｖｄｄ バイアス電圧
Ｖｃｃ バイアス電圧
ＴＶ テレビ受像機
ＳＴＢ セットトップボックス
DESCRIPTION OF SYMBOLS 1 Output transmission path at the time of feeding 2 Output transmission path at the time of no feeding 11 Gate terminal of depletion type FET 12 Drain terminal of depletion type FET 13 Source terminal IC21 Device (high frequency amplifier using depletion type FET)
D21 Photodiode L21 Choke coil L22 Choke coil C21 Capacitor C22 Capacitor C23 Capacitor R21 Resistor CN21 Power supply output terminal CN32 Power supply output terminal Vdd Bias voltage Vcc Bias voltage TV TV receiver STB Set top box
Claims (2)
前記光信号を光／電気変換するフォトダイオードと、
前記光受信装置への給電時に、前記フォトダイオードに逆電圧を印加するバイアス電源と、
前記フォトダイオードのカソード側に設けられた給電時出力伝送路と、
前記フォトダイオードのアノード側に設けられた無給電時出力伝送路と、
前記給電時出力伝送路に設けられたデプレッション型ＦＥＴが使用された高周波増幅器と、
を備え、
前記フォトダイオードは、カソード側がチョークコイルを介してバイアス電源と接続され、アノード側が抵抗を介して接地され、
前記高周波増幅器で使用されたデプレッション型ＦＥＴは、前記ゲート端子がコンデンサを介して前記フォトダイオードのカソード側に接続され、ドレイン端子がチョークコイルを介して前記バイアス電源と接続され、ソース端子が接地され、
前記光受信装置への給電時には、前記フォトダイオードが光信号を電気信号に変換してＲＦ信号が取り出され、前記ＲＦ信号が前記デプレッション型ＦＥＴのゲート端子に入力され、当該デプレッション型ＦＥＴで増幅されて前記給電時出力伝送路の出力側に伝送され、
前記光受信装置への無給電時には、前記デプレッション型ＦＥＴのドレイン−ソース端子間が接地されることにより、前記フォトダイオードのカソード側が前記デプレッション型ＦＥＴを介して接地されて、光信号がフォトダイオードにより電気信号に変換されてＲＦ信号が取り出され、当該ＲＦ信号がフォトダイオードのアノード側から前記無給電時出力伝送路に出力される、
ことを特徴とする光受信装置。 In an optical receiver that extracts an RF signal by converting an optical signal into an electrical signal,
A photodiode for optical / electrical conversion of the optical signal;
A bias power source for applying a reverse voltage to the photodiode when power is supplied to the optical receiver;
An output transmission path during power feeding provided on the cathode side of the photodiode;
Non-powered output transmission path provided on the anode side of the photodiode;
A high-frequency amplifier using a depletion type FET provided in the output transmission path at the time of feeding;
With
The photodiode has a cathode side connected to a bias power source via a choke coil, and an anode side grounded via a resistor.
In the depletion type FET used in the high frequency amplifier, the gate terminal is connected to the cathode side of the photodiode via a capacitor, the drain terminal is connected to the bias power source via a choke coil, and the source terminal is grounded. ,
When power is supplied to the optical receiver, the photodiode converts an optical signal into an electrical signal and an RF signal is extracted. The RF signal is input to the gate terminal of the depletion type FET and amplified by the depletion type FET. Transmitted to the output side of the power transmission output transmission path,
When no power is supplied to the optical receiver, the drain-source terminal of the depletion type FET is grounded, so that the cathode side of the photodiode is grounded via the depletion type FET, and the optical signal is transmitted by the photodiode. An RF signal is taken out by being converted into an electrical signal, and the RF signal is output from the anode side of the photodiode to the non-powered output transmission path.
An optical receiver characterized by that.
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| JP5654781B2 (en) * | 2010-06-18 | 2015-01-14 | ホーチキ株式会社 | Optical receiver system |
| JP2012033996A (en) * | 2010-07-28 | 2012-02-16 | Hochiki Corp | Photoelectric conversion plug |
| JP5743695B2 (en) * | 2011-05-02 | 2015-07-01 | ホーチキ株式会社 | booster |
| JP6285391B2 (en) * | 2015-04-30 | 2018-02-28 | 古河電気工業株式会社 | Optical receiver |
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| JP2007158669A (en) * | 2005-12-05 | 2007-06-21 | Dx Antenna Co Ltd | Optical terminal unit and optical subscriber terminal equipment |
| JP2008306693A (en) * | 2007-05-09 | 2008-12-18 | Hochiki Corp | Photoelectric conversion device |
| JP2009033405A (en) * | 2007-07-26 | 2009-02-12 | Hochiki Corp | Photoelectric conversion device |
| JP2010068195A (en) * | 2008-09-10 | 2010-03-25 | Hochiki Corp | Photoelectric conversion device |
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|---|---|---|---|---|
| JP2007158669A (en) * | 2005-12-05 | 2007-06-21 | Dx Antenna Co Ltd | Optical terminal unit and optical subscriber terminal equipment |
| JP2008306693A (en) * | 2007-05-09 | 2008-12-18 | Hochiki Corp | Photoelectric conversion device |
| JP2009033405A (en) * | 2007-07-26 | 2009-02-12 | Hochiki Corp | Photoelectric conversion device |
| JP2010068195A (en) * | 2008-09-10 | 2010-03-25 | Hochiki Corp | Photoelectric conversion device |
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