JP3527607B2 - Optical control signal transmission device - Google Patents
Optical control signal transmission deviceInfo
- Publication number
- JP3527607B2 JP3527607B2 JP02909897A JP2909897A JP3527607B2 JP 3527607 B2 JP3527607 B2 JP 3527607B2 JP 02909897 A JP02909897 A JP 02909897A JP 2909897 A JP2909897 A JP 2909897A JP 3527607 B2 JP3527607 B2 JP 3527607B2
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- Japan
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- signal
- light
- wavelength
- control signal
- optical
- Prior art date
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Description
【０００１】[0001]
【発明の属する技術分野】本発明は、伝送するデータ信
号（本願明細書では「主信号」という。）とともに、伝
送系を監視または制御するための制御信号を伝送する光
制御信号伝送装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical control signal transmission device that transmits a control signal for monitoring or controlling a transmission system together with a data signal to be transmitted (hereinafter referred to as "main signal").
【０００２】[0002]
【従来の技術】光伝送システムでは、主信号とともに、
例えば主信号の行き先に関する情報や、各伝送装置の動
作状態を監視するためのモニタ信号などが制御信号とし
て伝送される。ただし、制御信号として伝送される情報
量は主信号に比べて十分に少ないので、その伝送速度は
主信号に比べて十分に低くてよい。2. Description of the Related Art In an optical transmission system, along with a main signal,
For example, information about the destination of the main signal and a monitor signal for monitoring the operating state of each transmission device are transmitted as control signals. However, since the amount of information transmitted as the control signal is sufficiently smaller than that of the main signal, its transmission speed may be sufficiently lower than that of the main signal.
【０００３】制御信号を伝送する第１の方法は、時間多
重により主信号列の中に制御信号列を折り込む方法であ
る。しかし、この方法は、伝送系の途中のノードで制御
信号だけを読み出したいときでも、主信号とともにすべ
ての信号を復調してその中から制御信号列を取り出す必
要があり、効率的ではない。制御信号を伝送する第２の
方法は、サブキャリア多重を用いる方法である。主信号
は所定のスペクトル拡がりをもっている。このスペクト
ル帯域外の周波数をキャリア周波数として制御信号で強
度変調して送出すると、受信側でフィルタを用いて制御
信号のキャリア周波数成分だけを抽出すれば、制御信号
のみを取り出すことができる。このとき、主信号成分に
ついては復調する必要がないので、時間多重による方法
に比べて簡単な構成で制御信号を得ることができる。The first method of transmitting the control signal is to fold the control signal sequence into the main signal sequence by time division multiplexing. However, this method is not efficient because it is necessary to demodulate all the signals together with the main signal and take out the control signal sequence from them even when it is desired to read only the control signals at a node in the middle of the transmission system. The second method for transmitting the control signal is a method using subcarrier multiplexing. The main signal has a predetermined spectral spread. When the frequency outside the spectrum band is used as the carrier frequency and intensity-modulated with the control signal and transmitted, only the carrier frequency component of the control signal can be extracted by using a filter on the receiving side to extract only the control signal. At this time, since it is not necessary to demodulate the main signal component, it is possible to obtain the control signal with a simpler structure than the method of time multiplexing.
【０００４】[0004]
【発明が解決しようとする課題】ところで、主信号は一
般に、低周波数から高周波数まで（例えば、ビットレー
ト周波数の 1／10000 からビットレート周波数まで）の
広い帯域を占有している。したがって、サブキャリア多
重を用いる方法において、制御信号を伝送するキャリア
周波数は、主信号スペクトルの帯域よりも高周波数また
は低周波数とする必要がある。ここで、高周波数側に設
定する場合には、高速で応答する受信装置が不可欠とな
る。一方、低周波数側に設定すると、波長多重伝送の場
合に光ファイバ増幅器の混変調の影響が出てくる。光フ
ァイバ増幅器は、低周波数で強度変調された信号光が入
力されると、入力信号光に応じて利得が変動する性質が
ある。By the way, the main signal generally occupies a wide band from a low frequency to a high frequency (for example, 1/10000 of the bit rate frequency to the bit rate frequency). Therefore, in the method using subcarrier multiplexing, the carrier frequency for transmitting the control signal needs to be higher or lower than the band of the main signal spectrum. Here, when setting to the high frequency side, a receiving device that responds at high speed is indispensable. On the other hand, if it is set to the low frequency side, the influence of the intermodulation of the optical fiber amplifier comes out in the case of wavelength division multiplexing transmission. The optical fiber amplifier has a property that the gain changes according to the input signal light when the signal light intensity-modulated at a low frequency is input.
【０００５】本発明は、波長多重伝送系において、制御
信号のキャリア周波数を主信号帯域の低周波数側に設定
しても、光ファイバ増幅器の混変調の影響を受けること
なく、各信号光に制御信号と主信号を多重して伝送する
ことができる光制御信号伝送装置を提供することを目的
とする。According to the present invention, even if the carrier frequency of the control signal is set to the low frequency side of the main signal band in the wavelength division multiplexing transmission system, each signal light is controlled without being affected by the cross modulation of the optical fiber amplifier. An object of the present invention is to provide an optical control signal transmission device capable of multiplexing and transmitting a signal and a main signal.
【０００６】[0006]
【課題を解決するための手段】本発明の光制御信号伝送
装置は、主信号によって光強度を変調し、かつ制御信号
によって光周波数を変調した各波長の信号光を波長多重
して送信する送信手段と、各波長の信号光の周波数偏移
を同時に検出し、その中から所定の制御信号を取り出す
受信手段とにより構成される。ここで、制御信号のキャ
リア周波数は、主信号の帯域外であり、かつ波長多重さ
れる信号光ごとに異なる値に設定される。これにより、
各波長の信号光ごとに、主信号と制御信号は信号光の強
度変調成分と周波数変調成分にそれぞれ変換して伝送す
ることができる。The optical control signal transmission device of the present invention is a transmission device for wavelength-multiplexing and transmitting signal light of each wavelength whose optical intensity is modulated by a main signal and whose optical frequency is modulated by a control signal. And a receiving means for simultaneously detecting the frequency shift of the signal light of each wavelength and extracting a predetermined control signal from the means. Here, the carrier frequency of the control signal is set to a value outside the band of the main signal and different for each signal light to be wavelength-multiplexed. This allows
For each signal light of each wavelength, the main signal and the control signal can be converted into an intensity modulation component and a frequency modulation component of the signal light and transmitted.
【０００７】[0007]
【発明の実施の形態】図１は、本発明の光制御信号伝送
装置の送信手段の実施形態を示す。図において、半導体
レーザと光強度変調器を接続して構成される送信手段が
各波長対応に複数組設けられる。各送信手段の半導体レ
ーザ１１−１〜１１−ｎは、発振閾値以上の一定バイア
ス電流および制御信号に応じた微小変調電流が印加され
る。ここで、各半導体レーザ１１−１〜１１−ｎは、互
いに異なる発振波長λ1 〜λn が設定され、それぞれ対
応する制御信号１〜ｎによりその光周波数が変調され
る。光強度変調器１２−１〜１２−ｎは、各周波数変調
光を入力し、その光強度をそれぞれ対応する主信号によ
り変調して出力する。なお、各制御信号のキャリア周波
数は、主信号スペクトルより低周波数であり、かつ半導
体レーザごとに異なる値ν1 〜νn に設定される。1 shows an embodiment of transmitting means of an optical control signal transmitting apparatus according to the present invention. In the figure, a plurality of sets of transmitting means configured by connecting a semiconductor laser and a light intensity modulator are provided for each wavelength. The semiconductor lasers 11-1 to 11-n of each transmitting means are applied with a constant bias current equal to or higher than an oscillation threshold and a minute modulation current according to a control signal. Here, the semiconductor lasers 11-1 to 11-n are set different oscillation wavelengths lambda 1 to [lambda] n to one another, the optical frequency is modulated by the corresponding control signals 1 to n. The light intensity modulators 12-1 to 12-n input each frequency-modulated light, modulate the light intensity by the corresponding main signal, and output it. The carrier frequency of each control signal is lower than the main signal spectrum and is set to different values ν 1 to ν n for each semiconductor laser.
【０００８】半導体レーザ１１−１〜１１−ｎは、印加
電流が変調されていると、それに応じて発振周波数およ
び光強度が変調される性質があるが、変調電流幅が小さ
いときには周波数変調が主となる。この性質を利用し、
半導体レーザ１１−１〜１１−ｎからそれぞれ制御信号
１〜ｎにより周波数変調された信号光（ＦＭ(ν1) 〜Ｆ
Ｍ(νn) ）を出力する。光強度変調器１２−１〜１２−
ｎはこの周波数変調光ＦＭを入力し、その光強度を主信
号により変調して出力する。これにより、光強度変調器
１２−１〜１２−ｎからは、主信号により光強度が変調
され、制御信号により光周波数が変調された信号光（Ｆ
Ｍ＋ＩＭ）が出力される。When the applied current is modulated, the semiconductor lasers 11-1 to 11-n have the property that the oscillation frequency and the light intensity are modulated accordingly. However, when the modulation current width is small, frequency modulation is the main. Becomes Taking advantage of this property,
Signal lights (FM (ν 1 ) to F that are frequency-modulated by the control signals 1 to n from the semiconductor lasers 11-1 to 11-n, respectively.
Output M (ν n )). Light intensity modulators 12-1 to 12-
n inputs the frequency-modulated light FM, modulates the light intensity of the frequency-modulated light FM with the main signal, and outputs the modulated signal. Thereby, from the light intensity modulators 12-1 to 12-n, the signal light (F) whose light intensity is modulated by the main signal and whose optical frequency is modulated by the control signal
M + IM) is output.
【０００９】各送信手段から出力される信号光ＦＭ＋Ｉ
Ｍは、合波器１３で合波されて送信される。なお、全チ
ャネルに共通する制御信号は、いずれか１つの信号光に
多重して伝送するようにしてもよい。図２は、本発明の
光制御信号伝送装置の受信手段の第１の実施形態を示
す。なお、受信手段は、光伝送システムの中継ノードま
たは受信装置に設けられるが、ここでは制御信号の抽出
にかかわる部分のみについて示す。Signal light FM + I output from each transmitting means
M is multiplexed by the multiplexer 13 and transmitted. The control signal common to all the channels may be multiplexed with any one of the signal lights and transmitted. FIG. 2 shows a first embodiment of the receiving means of the optical control signal transmission device of the present invention. Although the receiving means is provided in the relay node or the receiving device of the optical transmission system, only the part related to the extraction of the control signal is shown here.
【００１０】図において、受信手段は、光分岐器２１
と、光フィルタ２３と、光検出器２４と、電気フィルタ
２６とにより構成される。光分岐器２１は、伝送されて
きた波長多重信号光（λ1 〜λn ）の一部を分岐し、光
フィルタ２３に送出する。光フィルタ２３は、各信号光
の周波数偏移を同時に検出する透過特性を有し、透過光
を光検出器２４に送出する。このような透過特性を有す
る光フィルタの例としては、ファブリペローフィルタや
マッハツェンダフィルタなどの周期光フィルタがある。
これらの周期光フィルタの透過特性は周期的であるの
で、透過周期と各信号光の波長間隔が一致していれば、
各信号光の周波数偏移を同時に検出することができる。In the figure, the receiving means is an optical splitter 21.
, An optical filter 23, a photodetector 24, and an electric filter 26. The optical branching device 21 branches a part of the transmitted wavelength multiplexed signal light (λ 1 to λ n ) and sends it to the optical filter 23. The optical filter 23 has a transmission characteristic of simultaneously detecting the frequency shift of each signal light, and sends the transmitted light to the photodetector 24. Examples of optical filters having such transmission characteristics include periodic optical filters such as Fabry-Perot filters and Mach-Zehnder filters.
Since the transmission characteristics of these periodic optical filters are periodic, if the transmission period and the wavelength interval of each signal light match,
The frequency shift of each signal light can be detected at the same time.
【００１１】光フィルタ２３の出力光強度は、光フィル
タ２３への入力光強度Ｐin-1〜Ｐin -nおよび光周波数ν
1 〜νn に依存し、The output light intensity of the optical filter 23 is the input light intensity P in-1 to P in -n to the optical filter 23 and the optical frequency ν.
Depends on 1 to ν n ,
【００１２】[0012]
【数１】 [Equation 1]
【００１３】と表すことができる。ここで、Ｔ(ν)は光
フィルタ２３の透過率である。また、Ｔ(ν)は、各信号
光の周波数偏移を一括して光強度に変換できるような特
性に設定する。この表記を用いると、光検出器２４の出
力信号は、It can be expressed as Here, T (ν) is the transmittance of the optical filter 23. Further, T (ν) is set to a characteristic such that the frequency deviation of each signal light can be collectively converted into the light intensity. Using this notation, the output signal of the photodetector 24 is
【００１４】[0014]
【数２】 [Equation 2]
【００１５】と表すことができる（ｋは比例定数）。こ
の式において、Ｐin-iは各主信号に応じて変調されてお
り、Ｔ(νi) は各制御信号に応じて変調されている。す
なわち、光検出器２４の出力信号には、各主信号成分お
よび各制御信号成分が含まれている。ここで、各主信号
スペクトルは同一周波数帯に重なっており、各制御信号
スペクトルは主信号スペクトルより低周波数側で、かつ
各チャネルごとに異なる周波数に位置している。そこ
で、光検出器２４の出力段に備えられた電気フィルタ２
６は、光検出器２４の出力信号の中から所望の制御信号
のキャリア周波数成分のみを透過させる。これにより、
波長多重信号光の中から所望の制御信号のみを得ること
ができる。It can be expressed as follows (k is a proportional constant). In this equation, P in-i is modulated according to each main signal, and T (ν i ) is modulated according to each control signal. That is, the output signal of the photodetector 24 contains each main signal component and each control signal component. Here, each main signal spectrum overlaps with the same frequency band, and each control signal spectrum is located on the lower frequency side than the main signal spectrum and at a different frequency for each channel. Therefore, the electric filter 2 provided at the output stage of the photodetector 24
6 transmits only the carrier frequency component of the desired control signal from the output signal of the photodetector 24. This allows
Only a desired control signal can be obtained from the wavelength division multiplexed signal light.
【００１６】ところで、本発明装置と従来装置との違い
は、制御信号が光周波数変調方式によって伝送されてい
る点にある。従来装置では、強度変調方式によって主信
号と制御信号が伝送されていたので、光ファイバ増幅器
の混変調の影響があった。一方、本発明装置では、主信
号が強度変調方式によって伝送され、制御信号が光周波
数変調方式によって伝送されるので、光強度は制御信号
の周波数成分で変調されていない。そのため、光ファイ
バ増幅器の混変調の影響を受けることなく、制御信号を
伝送することができる。By the way, the difference between the device of the present invention and the conventional device is that the control signal is transmitted by the optical frequency modulation method. In the conventional apparatus, since the main signal and the control signal are transmitted by the intensity modulation method, there is an influence of the cross modulation of the optical fiber amplifier. On the other hand, in the device of the present invention, since the main signal is transmitted by the intensity modulation method and the control signal is transmitted by the optical frequency modulation method, the light intensity is not modulated by the frequency component of the control signal. Therefore, the control signal can be transmitted without being affected by the cross modulation of the optical fiber amplifier.
【００１７】なお、以上の説明では、光強度の変動は主
信号の変調によるもののみとしたが、実際には伝送系の
揺らぎなどの他の要因により光強度が変動し、その変動
周波数が制御信号のキャリア周波数帯に重なると、制御
信号の抽出動作に影響が現れる。これを避けるために
は、図３に示すように、光分岐器２２を介して光フィル
タ２３への入力信号光を分岐して第２の光検出器２５に
入力し、その出力信号を第２の電気フィルタ２７で所望
の制御信号のキャリア周波数成分を抜き出す。そして、
割算回路２８で、電気フィルタ２６の出力信号を電気フ
ィルタ２７の出力信号で割算すれば、制御信号のキャリ
ア周波数帯に重なった光強度変動による影響を除去する
ことができるので、光周波数変調成分のみを抽出するこ
とができる。In the above description, the fluctuation of the light intensity is only due to the modulation of the main signal, but in reality, the light intensity fluctuates due to other factors such as fluctuation of the transmission system, and the fluctuation frequency is controlled. When it overlaps with the carrier frequency band of the signal, the operation of extracting the control signal is affected. In order to avoid this, as shown in FIG. 3, the input signal light to the optical filter 23 is branched via the optical branching device 22 and input to the second photodetector 25, and its output signal is output to the second optical detector 25. The electric filter 27 extracts the carrier frequency component of the desired control signal. And
When the output signal of the electric filter 26 is divided by the output signal of the electric filter 27 in the division circuit 28, the carrier of the control signal is obtained.
(A) Eliminate the effects of light intensity fluctuations that overlap the frequency band
Therefore, it is possible to extract only the optical frequency modulation component.
You can
【００１８】[0018]
【発明の効果】以上説明したように、本発明の光制御信
号伝送装置は、波長多重伝送系において、光ファイバ増
幅器の混変調の影響を受けることなく、各波長の信号光
ごとに主信号および制御信号を多重して伝送することが
できる。As described above, the optical control signal transmission device of the present invention, in the wavelength division multiplex transmission system, is not affected by the intermodulation of the optical fiber amplifier, and the main signal and The control signal can be multiplexed and transmitted.
【図１】本発明の光制御信号伝送装置の送信手段の実施
形態を示すブロック図。FIG. 1 is a block diagram showing an embodiment of transmission means of an optical control signal transmission device of the present invention.
【図２】本発明の光制御信号伝送装置の受信手段の第１
の実施形態を示すブロック図。FIG. 2 is the first of the receiving means of the optical control signal transmission device of the present invention.
3 is a block diagram showing an embodiment of FIG.
【図３】本発明の光制御信号伝送装置の受信手段の第２
の実施形態を示すブロック図。FIG. 3 is a second of the receiving means of the optical control signal transmission device of the present invention.
3 is a block diagram showing an embodiment of FIG.
１１ 半導体レーザ １２ 光強度変調器 １３ 合波器 ２１，２２ 光分岐器 ２３ 光フィルタ ２４，２５ 光検出器 ２６，２７ 電気フィルタ ２８ 割算回路 11 Semiconductor laser 12 Light intensity modulator 13 multiplexer 21,22 Optical splitter 23 Optical filter 24,25 photo detector 26,27 Electric filter 28 division circuit
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ Ｈ０４Ｂ 10/152 Ｈ０４Ｊ 14/02 (58)調査した分野(Int.Cl.7，ＤＢ名) H04J 14/00 H04B 10/04 H04B 10/06 H04B 10/08 H04B 10/142 H04B 10/152 H04J 14/02 ─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. 7 identification code FI H04B 10/152 H04J 14/02 (58) Fields investigated (Int.Cl. 7 , DB name) H04J 14/00 H04B 10/04 H04B 10/06 H04B 10/08 H04B 10/142 H04B 10/152 H04J 14/02
Claims (4)
御信号によって光周波数を変調した各波長の信号光を波
長多重して送信する送信手段と、 前記各波長の信号光の周波数偏移を同時に検出し、その
中から所定の制御信号を取り出す受信手段とを備え、 前記制御信号のキャリア周波数は、前記主信号の帯域外
であり、かつ波長多重される信号光ごとに異なる値に設
定され、前記送信手段は、 発振閾値以上の一定バイアス電流および制御信号に応じ
た微小変調電流が印加され、発振光の光周波数を変調し
て出力する半導体レーザと、 前記半導体レーザの出力光を入力し、その光強度を主信
号により変調して出力する光強度変調器とを備えた こと
を特徴とする光制御信号伝送装置。1. Transmitting means for wavelength-multiplexing and transmitting signal light of each wavelength, the optical intensity of which is modulated by a main signal and the optical frequency of which is modulated by a control signal, and a frequency shift of the signal light of each wavelength. The carrier frequency of the control signal is outside the band of the main signal, and is set to a different value for each wavelength multiplexed signal light. , The transmitting means is responsive to a constant bias current above the oscillation threshold and a control signal.
Is applied to modulate the optical frequency of the oscillated light.
A semiconductor laser for outputting Te, receiving the output light of said semiconductor laser, Shushin the light intensity
Light control signal transmission device is characterized in that a light intensity modulator for modulating and outputting the item.
御信号によって光周波数を変調した各波長の信号光を波
長多重して送信する送信手段と、 前記各波長の信号光の周波数偏移を同時に検出し、その
中から所定の制御信号を取り出す受信手段とを備え、 前記制御信号のキャリア周波数は、前記主信号の帯域外
であり、かつ波長多重される信号光ごとに異なる値に設
定され、前記受信手段は、 波長多重された各波長の信号光を入力し、各波長の信号
光の周波数偏移を光強度として同時に検出する透過特性
を有する光フィルタと、 前記光フィルタの出力光を入力し、その光強度を検出す
る光検出器と、 前記光検出器の出力信号から所定の制御信号のキャリア
周波数成分を抽出する電気フィルタとを備えた構成であ
る ことを特徴とする光制御信号伝送装置。2. Transmitting means for wavelength-multiplexing and transmitting signal light of each wavelength whose optical intensity is modulated by a main signal and whose optical frequency is modulated by a control signal, and frequency shift of the signal light of each wavelength. The carrier frequency of the control signal is outside the band of the main signal, and is set to a different value for each wavelength multiplexed signal light. The receiving means inputs the wavelength-multiplexed signal light of each wavelength and outputs the signal of each wavelength.
Transmission characteristics that simultaneously detect the frequency shift of light as light intensity
And an output light from the optical filter are input and the light intensity thereof is detected.
And a carrier of a predetermined control signal from the output signal of the photodetector
A configuration including an electric filter for extracting frequency components.
Optical control signal transmission apparatus characterized by that.
御信号によって光周波数を変調した各波長の信号光を波
長多重して送信する送信手段と、 前記各波長の信号光の周波数偏移を同時に検出し、その
中から所定の制御信号を取り出す受信手段とを備え、 前記制御信号のキャリア周波数は、前記主信号の帯域外
であり、かつ波長多重される信号光ごとに異なる値に設
定され、前記受信手段は、 波長多重された各波長の信号光を２分岐する分岐手段
と、 前記分岐手段で分岐された一方の波長多重信号光を入力
し、各波長の信号光の周波数偏移を光強度として同時に
検出する透過特性を有する光フィルタと、 前記光フィルタの出力光を入力し、その光強度を検出す
る第１の光検出器と、 前記第１の光検出器の出力信号から所定の制御信号のキ
ャリア周波数成分を抽出する第１の電気フィルタと、 前記分岐手段で分岐された他方の波長多重信号光を入力
し、その光強度を検出する第２の光検出器と、 前記第２の光検出器の出力信号から前記所定の制御信号
のキャリア周波数成分を抽出する第２の電気フィルタ
と、 前記第１の電気フィルタの出力信号を前記第２の電気フ
ィルタの出力信号で割算して前記信号光に重畳された制
御信号を出力する割算回路とを備えた構成である ことを
特徴とする光制御信号伝送装置。3. Transmitting means for wavelength-multiplexing and transmitting the signal light of each wavelength whose optical intensity is modulated by a main signal and whose optical frequency is modulated by a control signal, and frequency shift of the signal light of each wavelength. The carrier frequency of the control signal is outside the band of the main signal, and is set to a different value for each wavelength multiplexed signal light. The receiving means is a branching means for branching the wavelength-multiplexed signal light of each wavelength into two.
And input one of the wavelength division multiplexed signal lights branched by the branching means
At the same time as the frequency shift of the signal light of each wavelength as the light intensity.
An optical filter having a transmission characteristic to be detected and the output light of the optical filter are input and the light intensity thereof is detected.
A first photodetector and a key of a predetermined control signal from the output signal of the first photodetector.
A first electric filter for extracting a carrier frequency component and the other wavelength-multiplexed signal light branched by the branching means are input.
And a second photodetector for detecting the light intensity, and the predetermined control signal based on the output signal of the second photodetector.
Second electric filter for extracting carrier frequency components of
And the output signal of the first electrical filter from the second electrical filter.
The output signal of the filter is divided by the control signal superimposed on the signal light.
An optical control signal transmission device , comprising: a division circuit that outputs a control signal.
た微小変調電流が印加され、発振光の光周波数を変調し
て出力する半導体レーザと、 前記半導体レーザの出力光を入力し、その光強度を主信
号により変調して出力する光強度変調器とを備えたこと
を特徴とする請求項２または請求項３に記載の光制御信
号伝送装置。4. A semiconductor laser that applies a constant bias current equal to or more than an oscillation threshold and a minute modulation current according to a control signal to the transmission means to modulate and output an optical frequency of oscillation light, and output light of the semiconductor laser. The optical control signal transmission device according to claim 2 or 3 , further comprising: a light intensity modulator that inputs the light intensity, modulates the light intensity by a main signal, and outputs the light intensity modulator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP02909897A JP3527607B2 (en) | 1997-02-13 | 1997-02-13 | Optical control signal transmission device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP02909897A JP3527607B2 (en) | 1997-02-13 | 1997-02-13 | Optical control signal transmission device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH10229384A JPH10229384A (en) | 1998-08-25 |
| JP3527607B2 true JP3527607B2 (en) | 2004-05-17 |
Family
ID=12266884
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP02909897A Expired - Fee Related JP3527607B2 (en) | 1997-02-13 | 1997-02-13 | Optical control signal transmission device |
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| Country | Link |
|---|---|
| JP (1) | JP3527607B2 (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6574016B1 (en) * | 1998-11-25 | 2003-06-03 | Nortel Networks Limited | Method and apparatus for ancillary data in a wavelength division multiplexed system |
| JP4543210B2 (en) * | 2004-05-20 | 2010-09-15 | 三菱電機株式会社 | Submarine observation device and submarine observation system |
| JP5206866B2 (en) * | 2009-03-30 | 2013-06-12 | 富士通株式会社 | Optical transmission system and optical transmission method |
| JP5811631B2 (en) | 2011-06-27 | 2015-11-11 | 富士通株式会社 | Superposition signal detection circuit and optical node device |
| JP5962455B2 (en) * | 2012-11-21 | 2016-08-03 | 富士通株式会社 | Optical transmission device, node device, optical transmission method, and optical transmission system |
| JP6079276B2 (en) | 2013-02-01 | 2017-02-15 | 富士通株式会社 | Signal detection circuit and optical transmission device |
| JP6175330B2 (en) * | 2013-09-18 | 2017-08-02 | 日本電信電話株式会社 | Optical transmitter, optical receiver, signal superimposing device, signal superimposing system, and signal superimposing method |
| CN106130652A (en) * | 2015-11-04 | 2016-11-16 | 威盛电子股份有限公司 | Optical transmitter and transmission method |
| WO2021214996A1 (en) * | 2020-04-24 | 2021-10-28 | 日本電信電話株式会社 | Transmission system, transmission method, and communication system |
| JP7343821B2 (en) | 2020-05-01 | 2023-09-13 | 日本電信電話株式会社 | Optical communication system and optical signal processing method |
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1997
- 1997-02-13 JP JP02909897A patent/JP3527607B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH10229384A (en) | 1998-08-25 |
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