JPH06334612A - Intermediate repeater system - Google Patents
Intermediate repeater systemInfo
- Publication number
- JPH06334612A JPH06334612A JP5120108A JP12010893A JPH06334612A JP H06334612 A JPH06334612 A JP H06334612A JP 5120108 A JP5120108 A JP 5120108A JP 12010893 A JP12010893 A JP 12010893A JP H06334612 A JPH06334612 A JP H06334612A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- output
- optical signal
- sub
- intermediate repeater
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、光ファイバ通信の中間
中継装置に利用する。本発明は主信号に重畳される副情
報信号のＳ／Ｎ改善に関する。本発明は、再生中継機能
（３Ｒ機能、Ｒｅｓｈａｐｉｎｇ（等化増幅），Ｒｅｔ
ｉｍｉｎｇ（タイミング），Ｒｅｇｅｎｅｒａｔｉｏｎ
（識別再生））を有する中間中継装置に利用するに適す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used as an intermediate repeater for optical fiber communication. The present invention relates to S / N improvement of a sub information signal superimposed on a main signal. The present invention has a regenerative repeating function (3R function, Reshaping (equalization amplification), Ret).
iming (timing), Regeneration
It is suitable for use in an intermediate relay device having (identification reproduction)).
【０００２】[0002]
【従来の技術】図４は従来例の中間中継装置の主信号お
よび副情報信号の信号スペクトラムを示す図である。2. Description of the Related Art FIG. 4 is a diagram showing a signal spectrum of a main signal and a sub information signal of a conventional intermediate repeater.
【０００３】従来、光ファイバ通信システムの中間中継
装置は、打合せ用電話、監視信号および制御信号などの
副情報を伝送するのに、主信号に重畳して伝送する場合
がある（特開昭５６−３１２４９号公報、特開昭６０−
２３５５６２号公報）。主信号に重畳する方法の一つと
して、あらかじめ周波数変調（ＦＭ、frequency modula
tion）または周波数シフトキーイング（ＦＳＫ、freque
ncy shift keying）された副情報信号を主信号に重畳す
る方法がある。Conventionally, an intermediate repeater of an optical fiber communication system transmits sub information such as a telephone for meetings, a supervisory signal and a control signal, but sometimes superimposes it on a main signal (JP-A-56). -31249, JP-A-60-
No. 235562). As one of the methods of superimposing on the main signal, frequency modulation (FM, frequency
or frequency shift keying (FSK, freque)
There is a method of superimposing the ncy shift keying) sub information signal on the main signal.
【０００４】一般に伝送路に送出される光信号は、５Ｂ
６Ｂ符号などでＢＳＩ（bit sequence independance ）
化することにより「１」連続または「０」連続を抑制し
タイミング成分を確保している。このため５Ｂ６Ｂ符号
などでＢＳＩ化された信号ｆ0 の信号スぺクトラムは図
４（ａ）に示す斜線部分のようになり低周波数領域に信
号スペクトラムは存在しない。ここに着目し、ＦＭ変調
またはＦＳＫ変調された副情報信号のキャリア周波数ｆ
SVを図４（ａ）に示す領域に設定し、主信号に重畳すれ
ば副情報信号をＳ／Ｎを良好にして伝送することができ
る。Generally, the optical signal sent to the transmission line is 5B.
BSI (bit sequence independence) such as 6B code
As a result, the "1" or "0" continuity is suppressed and the timing component is secured. Therefore, the signal spectrum of the signal f 0 converted into BSI by the 5B6B code or the like is as shown by the hatched portion in FIG. 4A, and there is no signal spectrum in the low frequency region. Paying attention to this, the carrier frequency f of the FM- or FSK-modulated sub-information signal
By setting the SV in the area shown in FIG. 4A and superimposing it on the main signal, the sub information signal can be transmitted with a good S / N.
【０００５】[0005]
【発明が解決しようとする課題】しかし、このような従
来例の中間中継装置では、伝送路の損失などにより主信
号の符号誤り率が増大すると主信号は５Ｂ６Ｂ符号則か
ら次第に外れ、ランダムパタンに近づいてくる。このた
めに、主信号ｆ0 の信号スペクトラムは図４（ｂ）に示
す斜線部分のようになり副情報信号のキャリア周波数ｆ
SVが存在する低周波数領域にもスペクトラムが延び、副
情報信号のキャリア周波数ｆSVのＳ／Ｎが劣化する欠点
があつた。However, in such an intermediate relay device of the conventional example, when the code error rate of the main signal increases due to the loss of the transmission line or the like, the main signal gradually deviates from the 5B6B coding rule and becomes a random pattern. it's coming. For this reason, the signal spectrum of the main signal f 0 becomes like the hatched portion shown in FIG. 4B, and the carrier frequency f of the sub information signal is
There is a drawback that the spectrum extends to the low frequency region where SV exists and the S / N of the carrier frequency f SV of the sub information signal deteriorates.
【０００６】本発明は前記の欠点を解決するもので、主
信号の品質が劣化している環境においても副情報信号を
誤りなく伝送することができる副情報信号重畳方式を提
供することを目的とする。The present invention solves the above-mentioned drawbacks, and an object of the present invention is to provide a sub information signal superimposing system capable of transmitting a sub information signal without error even in an environment where the quality of the main signal is deteriorated. To do.
【０００７】[0007]
【課題を解決するための手段】本発明は、主信号により
変調された光信号を入力し電気信号に変換する光信号電
気信号変換器およびこの光信号電気信号変換器の出力を
光信号に変換する電気信号光信号変換器を含む中間中継
器と、周波数変調された副情報信号を前記主信号に重畳
する手段を備えた中間中継装置において、前記光信号電
気信号変換器の出力の単位時間当たりの符号則誤りを検
出する検出器と、この検出器の出力に応じて前記副情報
信号に振幅変調を施す振幅変調器とを備えたことを特徴
とする。また、本発明は、前記検出器の検出出力を基準
値と比較する比較器を備え、前記振幅変調器はこの比較
器の出力に応じて二値振幅変調を施す手段を含むことが
できる。SUMMARY OF THE INVENTION The present invention provides an optical signal / electrical signal converter for inputting an optical signal modulated by a main signal and converting it into an electric signal, and an output of this optical signal / electrical signal converter to an optical signal. An intermediate repeater including an electric signal / optical signal converter and a means for superposing a frequency-modulated sub-information signal on the main signal, wherein the output of the optical signal / electrical signal converter per unit time The detector for detecting the coding rule error and the amplitude modulator for amplitude-modulating the sub-information signal according to the output of the detector. Further, the present invention may include a comparator that compares the detection output of the detector with a reference value, and the amplitude modulator may include means for performing binary amplitude modulation according to the output of the comparator.
【０００８】さらに、本発明は、前記中間中継器は、伝
送路の特性により歪んだ受信波形を識別に適した波形に
整形増幅する等化増幅手段と、この等化増幅手段の出力
からタイミング・パルスを抽出するタイミング手段と、
このタイミング・パルスにより受信パルス符号系列の識
別を行う識別再生手段とを含むことができる。Further, according to the present invention, the intermediate repeater has an equalizing / amplifying means for shaping and amplifying a received waveform distorted due to the characteristics of the transmission line into a waveform suitable for identification, and a timing / output from the output of the equalizing / amplifying means. Timing means for extracting pulses,
Identification reproduction means for identifying the received pulse code sequence by the timing pulse can be included.
【０００９】[0009]
【作用】光信号電気信号変換器の出力の単位時間当たり
の符号則誤りを検出し、この検出出力と基準値とを比較
する。この比較結果に応じて副情報信号に振幅変調を施
す。これにより伝送路の損失などで主信号の符号誤り率
が増大したときには副情報信号の変調度を大きくしてＳ
／Ｎの劣化を防ぐので、主信号の品質が劣化している環
境においても副情報信号を誤りなく伝送することができ
る。The coding rule error per unit time of the output of the optical signal / electric signal converter is detected, and the detected output is compared with the reference value. Amplitude modulation is applied to the sub information signal according to the comparison result. As a result, when the bit error rate of the main signal increases due to the loss of the transmission line, the modulation degree of the sub information signal is increased and S
Since / N is prevented from being deteriorated, the sub information signal can be transmitted without error even in an environment in which the quality of the main signal is deteriorated.
【００１０】[0010]
【実施例】本発明の実施例について図面を参照して説明
する。Embodiments of the present invention will be described with reference to the drawings.
【００１１】図１は本発明一実施例中間中継装置のブロ
ック構成図である。図１において、中間中継装置は、主
信号により変調された光信号を入力し電気信号に変換す
る光信号電気信号変換器１１および光信号電気信号変換
器１１の出力を光信号に変換する電気信号光信号変換器
１２を含む中間中継器１０と、ＦＭ変調またはＦＳＫ変
調された副情報信号を前記主信号に重畳する手段を備え
る。FIG. 1 is a block diagram of an intermediate relay device according to an embodiment of the present invention. In FIG. 1, the intermediate repeater device receives an optical signal modulated by a main signal and converts the optical signal into an electrical signal, and an electrical signal converting an output of the optical signal to an electrical signal converter 11 into an optical signal. An intermediate repeater 10 including an optical signal converter 12 and means for superimposing an FM-modulated or FSK-modulated sub-information signal on the main signal are provided.
【００１２】ここで本発明の特徴とするところは、光信
号電気信号変換器１１の出力の単位時間当たりの符号則
誤りを検出する検出器として符号則誤り検出器１と、符
号則誤り検出器１の出力に応じて前記副情報信号に振幅
変調を施す振幅変調器３とを備えたことにある。The feature of the present invention is that the code rule error detector 1 and the code rule error detector are detectors for detecting the code rule error per unit time of the output of the optical signal electrical signal converter 11. The amplitude modulator 3 which performs amplitude modulation on the sub-information signal in accordance with the output of 1 is provided.
【００１３】また、符号則誤り検出器１の検出出力を基
準値として基準電圧と比較する比較器２を備え、振幅変
調器３は比較器２の出力に応じて二値振幅変調を施す手
段を含む。Further, a comparator 2 for comparing the detection output of the code rule error detector 1 with a reference voltage as a reference value is provided, and the amplitude modulator 3 is a means for performing binary amplitude modulation according to the output of the comparator 2. Including.
【００１４】このような構成の中間中継装置の動作につ
いて説明する。The operation of the intermediate relay device having such a configuration will be described.
【００１５】図２は本発明の中間中継装置の主信号およ
び副情報信号の信号スペクトラムを示す図である。本実
施例はあらかじめＦＭ変調またはＦＳＫ変調された打合
せ用電話、監視信号および制御信号などの副情報信号ｆ
svを主信号ｆ0 の振幅変調により重畳して伝送する方法
において、伝送路の損失の増大などにより主信号ｆ0の
符号誤り率が増大した場合でも副情報信号ｆsvの信号対
雑音比を良好に確保する方法である。FIG. 2 is a diagram showing the signal spectra of the main signal and the sub information signal of the intermediate repeater of the present invention. In this embodiment, a sub-information signal f such as a telephone for meeting, a monitor signal and a control signal, which has been FM-modulated or FSK-modulated in advance,
The sv A method for transmitting superimposed by the amplitude modulation of the main signal f 0, the signal-to-noise ratio of the sub information signal f sv even if a code error rate of the main signal f 0 due increase in loss of the transmission path is increased This is a good way to secure it.
【００１６】図１および図２において、光信号電気信号
変換器１１と電気信号光信号変換器１２とから構成され
た中間中継器１０の光信号電気信号変換器１１により電
気信号に変換された主信号ｆ0 を符号則誤り検出器１に
入力する。1 and 2, the main signal converted into an electric signal by the optical signal / electrical signal converter 11 of the intermediate repeater 10 composed of the optical signal / electrical signal converter 11 and the electric signal / optical signal converter 12. The signal f 0 is input to the code rule error detector 1.
【００１７】符号則誤り検出器１は主信号ｆ0 の符号則
誤りを計測し、単位時間当たりの符号則誤りの数に比例
した電圧を出力する。比較器２は、符号則誤り検出器１
の出力電圧と基準電圧とを比較し符号則誤り検出器１の
出力電圧が基準電圧より大きくなると、すなわち単位時
間あたりの符号則誤りの数が一定値を超えると、一定の
電圧を出力する。振幅変調器３は、あらかじめＦＭ変調
またはＦＳＫ変調された打合せ用電話、監視信号および
制御信号などの副情報信号ｆsvを主信号ｆ0 に重畳し副
情報信号を伝送する。このとき、光信号電気信号変換器
１１により電気信号に変換された主信号ｆ0 の単位時間
当たりの符号則誤りの数が一定値を超えているならば、
比較器２の出力を受けて副情報信号ｆsvの振幅を大きく
し、すなわち、主信号ｆ0 に重畳する際の変調度を大き
くすることにより、図２に示すように副情報信号ｆsvの
Ｓ／Ｎの劣化を防ぐことができる。The code rule error detector 1 measures the code rule error of the main signal f 0 and outputs a voltage proportional to the number of code rule errors per unit time. The comparator 2 is the code rule error detector 1
When the output voltage of the code rule error detector 1 becomes larger than the reference voltage, that is, when the number of code rule errors per unit time exceeds a certain value, a constant voltage is output. The amplitude modulator 3 superimposes a sub information signal f sv such as a telephone for meetings, a monitor signal and a control signal, which have been FM-modulated or FSK-modulated in advance, on the main signal f 0 and transmits the sub-information signal. At this time, if the number of coding rule errors per unit time of the main signal f 0 converted into an electric signal by the optical signal electric signal converter 11 exceeds a certain value,
By receiving the output of the comparator 2 and increasing the amplitude of the sub-information signal f sv , that is, increasing the modulation factor when superimposing it on the main signal f 0 , the sub-information signal f sv of the sub-information signal f sv is increased as shown in FIG. It is possible to prevent deterioration of S / N.
【００１８】したがって、主信号の品質が劣化している
環境においても副情報信号ｆsvをエラーフリーで伝送す
ることができる。Therefore, the sub information signal f sv can be transmitted error-free even in an environment where the quality of the main signal is deteriorated.
【００１９】このことは中間中継器１０の上流側の伝送
路でなんらかの障害がおきても、少なくとも副情報信号
ｆsvは下流側に伝送することができることを意味し、シ
ステムの運用上非常に有効である。This means that at least the sub information signal f sv can be transmitted to the downstream side even if some trouble occurs in the transmission line on the upstream side of the intermediate repeater 10, which is very effective in the operation of the system. Is.
【００２０】図３は本発明他の実施例中間中継装置のブ
ロック構成である。図３において、この中間中継器は再
生中継回路を有し、２０は等化増幅手段、２１は等化増
幅部、２２はＡＧＣ部 、３０はタイミング手段、３１
はタイミング抽出部、３２はタイミング波発生部、４０
は識別再生手段、４１は識別部および４２は再生増幅部
を示す。この実施例では識別再生手段４０から出力され
た電気信号に変換され再生された主信号ｆ0 を符号則誤
り検出器に入力する。以下の動作は図１に示す場合と同
様である。FIG. 3 is a block diagram of an intermediate relay device according to another embodiment of the present invention. In FIG. 3, this intermediate repeater has a regenerative repeater circuit, 20 is an equalization amplification means, 21 is an equalization amplification section, 22 is an AGC section, 30 is a timing means, 31
Is a timing extraction unit, 32 is a timing wave generation unit, 40
Is an identification reproduction unit, 41 is an identification unit, and 42 is a reproduction amplification unit. In this embodiment, the main signal f 0 converted into the electric signal output from the identification / reproduction means 40 and reproduced is input to the code rule error detector. The subsequent operation is the same as that shown in FIG.
【００２１】[0021]
【発明の効果】以上説明したように、本発明は、副情報
信号の信号対雑音比の劣化を防止することができ、主信
号の品質が劣化している環境においても副情報信号を誤
りなく伝送することができる優れた効果がある。As described above, according to the present invention, it is possible to prevent the deterioration of the signal-to-noise ratio of the sub information signal, and the sub information signal can be transmitted without error even in the environment where the quality of the main signal is deteriorated. There is an excellent effect that can be transmitted.
【図１】本発明一実施例中間中継装置のブロック構成
図。FIG. 1 is a block configuration diagram of an intermediate relay device according to an embodiment of the present invention.
【図２】本発明の中間中継装置の主信号および副情報信
号の信号スペクトラムを示す図。FIG. 2 is a diagram showing signal spectra of a main signal and a sub information signal of the intermediate relay device of the present invention.
【図３】本発明他の実施例中間中継装置のブロック構成
図。FIG. 3 is a block configuration diagram of an intermediate relay device according to another embodiment of the present invention.
【図４】従来例の中間中継装置の主信号および副情報信
号の信号スペクトラムを示す図。FIG. 4 is a diagram showing signal spectra of a main signal and a sub information signal of an intermediate relay device of a conventional example.
１ 符号誤り検出器 ２ 比較器 ３ 振幅変調器 １０、１０Ａ 中間中継器 １１ 光信号電気信号変換器 １２ 電気信号光信号変換器 ２０ 等化増幅手段 ２１ 等化増幅部 ２２ ＡＧＣ部 ３０ タイミング手段 ３１ タイミング抽出部 ３２ タイミング波発生部 ４０ 識別再生手段 ４１ 識別部 ４２ 再生増幅部 ｆ0 主信号 ｆSV 副情報信号DESCRIPTION OF SYMBOLS 1 code error detector 2 comparator 3 amplitude modulator 10, 10A intermediate repeater 11 optical signal electrical signal converter 12 electrical signal optical signal converter 20 equalization amplification means 21 equalization amplification section 22 AGC section 30 timing means 31 timing Extraction unit 32 Timing wave generation unit 40 Discrimination reproduction means 41 Discrimination unit 42 Reproduction amplification unit f 0 Main signal f SV Sub information signal
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.5 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｈ０４Ｊ 14/06 Ｈ０４Ｌ 7/027 7741−5Ｋ Ｈ０４Ｌ 7/02 Ａ ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 5 Identification code Office reference number FI Technical display location H04J 14/06 H04L 7/027 7741-5K H04L 7/02 A
Claims (3)
電気信号に変換する光信号電気信号変換器およびこの光
信号電気信号変換器の出力を光信号に変換する電気信号
光信号変換器を含む中間中継器と、周波数変調された副
情報信号を前記主信号に重畳する手段を備えた中間中継
装置において、 前記光信号電気信号変換器の出力の単位時間当たりの符
号則誤りを検出する検出器と、この検出器の出力に応じ
て前記副情報信号に振幅変調を施す振幅変調器とを備え
たことを特徴とする中間中継装置。1. An optical signal / electrical signal converter for inputting an optical signal modulated by a main signal and converting it into an electric signal, and an electric signal / optical signal converter for converting the output of the optical signal / electrical signal converter into an optical signal. In an intermediate repeater equipped with an intermediate repeater including, and means for superimposing a frequency-modulated sub-information signal on the main signal, detection for detecting a coding rule error per unit time of the output of the optical signal electrical signal converter And an amplitude modulator for amplitude-modulating the sub information signal according to the output of the detector.
る比較器を備え、前記振幅変調器はこの比較器の出力に
応じて二値振幅変調を施す手段を含む請求項１記載の中
間中継装置。2. The intermediate according to claim 1, further comprising a comparator for comparing a detection output of the detector with a reference value, and the amplitude modulator includes means for performing binary amplitude modulation according to the output of the comparator. Relay device.
歪んだ受信波形を識別に適した波形に整形増幅する等化
増幅手段と、この等化増幅手段の出力からタイミング・
パルスを抽出するタイミング手段と、このタイミング・
パルスにより受信パルス符号系列の識別を行う識別再生
手段とを含む請求項１記載の中間中継装置。3. The intermediate repeater comprises an equalization amplification means for shaping and amplifying a reception waveform distorted due to the characteristics of the transmission line into a waveform suitable for discrimination, and a timing output from the output of the equalization amplification means.
Timing means to extract the pulse and this timing
The intermediate repeater according to claim 1, further comprising identification and reproduction means for identifying a received pulse code sequence by a pulse.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5120108A JP2531086B2 (en) | 1993-05-21 | 1993-05-21 | Intermediate repeater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5120108A JP2531086B2 (en) | 1993-05-21 | 1993-05-21 | Intermediate repeater |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06334612A true JPH06334612A (en) | 1994-12-02 |
| JP2531086B2 JP2531086B2 (en) | 1996-09-04 |
Family
ID=14778137
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5120108A Expired - Lifetime JP2531086B2 (en) | 1993-05-21 | 1993-05-21 | Intermediate repeater |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2531086B2 (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02262743A (en) * | 1989-04-03 | 1990-10-25 | Nec Corp | Optical repeater |
-
1993
- 1993-05-21 JP JP5120108A patent/JP2531086B2/en not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02262743A (en) * | 1989-04-03 | 1990-10-25 | Nec Corp | Optical repeater |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2531086B2 (en) | 1996-09-04 |
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