JP2003258373A5 - - Google Patents
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- JP2003258373A5 JP2003258373A5 JP2002056086A JP2002056086A JP2003258373A5 JP 2003258373 A5 JP2003258373 A5 JP 2003258373A5 JP 2002056086 A JP2002056086 A JP 2002056086A JP 2002056086 A JP2002056086 A JP 2002056086A JP 2003258373 A5 JP2003258373 A5 JP 2003258373A5
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Claims (13)
所定波長の光を出力する半導体レーザと、
入力される制御信号に応じて前記半導体レーザの波長を制御する波長制御部と、
周期性を有する周期信号を発生する周期信号源と、
前記周期信号と所定のバイアス値を重畳した電流信号で前記半導体レーザを駆動する電流源と、
前記周期信号の極性を反転させる極性反転部と、
前記極性反転部から出力された信号とデータとを多重する多重部と、
前記多重部から出力された信号により前記半導体レーザから出力される光を強度変調する強度変調部と、
前記強度変調部から出力される光信号を波長に応じた透過率で透過する光フィルタ手段と、
前記光フィルタ手段を透過した光信号を電気信号に変換する光電気変換部と、
前記光電気変換部より出力される電気信号から前記周期信号と同じ周期を有する信号を抽出し、当該抽出された前記周期信号と同じ周期を有する信号に基づき制御信号を前記波長制御部に送る制御信号検出部とを備える波長制御装置。A wavelength control device for controlling the wavelength of an optical signal,
A semiconductor laser that outputs light of a predetermined wavelength;
A wavelength control unit that controls the wavelength of the semiconductor laser in accordance with an input control signal;
A periodic signal source for generating a periodic signal having periodicity;
A current source that drives the semiconductor laser with a current signal in which the periodic signal and a predetermined bias value are superimposed;
A polarity inversion unit for inverting the polarity of the periodic signal;
A multiplexing unit that multiplexes the signal and data output from the polarity inversion unit;
An intensity modulating unit that modulates the intensity of light output from the semiconductor laser by a signal output from the multiplexing unit;
An optical filter means for transmitting an optical signal output from the intensity modulator with a transmittance according to the wavelength;
A photoelectric conversion unit that converts an optical signal transmitted through the optical filter means into an electrical signal;
The light extracting an electrical signal from the electrical signal output from the conversion unit having the same period as the periodic signal, based on the Evaluation Technical control signal into a signal having the same period as the periodic signal the extracted to the wavelength control unit A wavelength control device comprising a control signal detection unit to be sent.
前記フィルタ手段が、それぞれ所定の波長の光信号のみを透過する複数の入力端子と１つの出力端子とを有し、各前記入力端子より入力される、前記複数の強度変調部から出力された互いに波長の異なる光信号を波長多重して前記出力端子から出力する波長多重部であり、
前記複数の周期信号源が出力する周期信号の周波数は互いに異なり、
前記複数の制御信号検出部は、それぞれ対応する前記周期信号源から出力される周期信号と同じ周期を有する信号のみを抽出することを特徴とする、請求項２記載の波長制御装置。A plurality of sets each including the semiconductor laser, the wavelength control unit, the periodic signal source, the current source, the polarity inversion unit, the multiplexing unit, the intensity modulation unit, and the control signal detection unit. ,
The filter means has a plurality of input terminals and one output terminal each transmitting only an optical signal having a predetermined wavelength, and is output from the plurality of intensity modulators input from the input terminals. It is a wavelength multiplexing unit that wavelength-multiplexes optical signals having different wavelengths and outputs them from the output terminal,
The frequency of the periodic signal output from the plurality of periodic signal sources is different from each other,
The wavelength control device according to claim 2 , wherein the plurality of control signal detection units extract only signals having the same period as the periodic signal output from the corresponding periodic signal source.
前記周期信号と同じ周期を有する信号の振幅を検出する振幅検出部と、
前記周期信号と同じ周期を有する信号の位相を検出する位相検出部とを含み、
前記制御信号検出部は、前記振幅検出部によって検出された振幅と前記位相検出部によって検出された位相とを前記制御信号として出力し、
前記波長制御部は、前記位相に応じて前記半導体レーザの出力波長の制御方向を決定し、前記振幅が０となるように波長の制御量を決定することを特徴とする、請求項２記載の波長制御装置。The control signal detector is
An amplitude detector that detects the amplitude of a signal having the same period as the periodic signal;
A phase detector that detects the phase of a signal having the same period as the periodic signal,
The control signal detection unit outputs the amplitude detected by the amplitude detection unit and the phase detected by the phase detection unit as the control signal,
The wavelength control unit determines the control direction of the output wavelength of the semiconductor laser in accordance with the phase, and determines a control amount of the wavelength so that the amplitude becomes zero, as claimed in claim 2, wherein Wavelength control device.
前記多重部は、前記極性反転部から出力された信号およびデータに加えて前記パイロット信号を多重し、
前記制御信号検出部は、
前記光電気変換部から出力された電気信号から周期信号と同じ周期を有する信号を抽出する第１のバンドパスフィルタと、
前記電気信号からパイロット信号と同じ周期を有する信号を抽出する第２のバンドパスフィルタと、
前記第２のバンドパスフィルタから出力されたパイロット信号と同じ周期を有する信号を逓倍する周波数逓倍部と、
前記第１のバンドパスフィルタから出力された周期信号と同じ周期を有する信号と前記周波数逓倍部から出力されたパイロット信号と同じ周期を有する信号とを乗算する乗算部と、
前記乗算部から出力された信号の直流レベルを抽出し、制御信号として出力するローパスフィルタとを含み、
前記波長制御部は、前記ローパスフィルタから出力される直流レベルが０となるように前記半導体レーザの波長を制御することを特徴とする、請求項２記載の波長制御装置。A pilot signal source that divides the periodic signal output from the periodic signal source and outputs a pilot signal;
The multiplexing unit multiplexes the pilot signal in addition to the signal and data output from the polarity inversion unit,
The control signal detector is
A first band-pass filter for extracting a signal having the same period as the signal from the electric signal output from said photoelectric conversion unit,
A second bandpass filter for extracting a signal having the same period as the pilot signal from the electrical signal;
A frequency multiplier that multiplies a signal having the same period as the pilot signal output from the second bandpass filter;
A multiplying unit for multiplying the signal having the same period as the pilot signal output from the signal and the frequency multiplier having the same period as the periodic signal output from the first bandpass filter,
A low-pass filter that extracts a direct current level of the signal output from the multiplier and outputs it as a control signal;
The wavelength control device according to claim 2 , wherein the wavelength control unit controls the wavelength of the semiconductor laser so that a direct current level output from the low-pass filter becomes zero.
前記制御信号検出部で検出される前記周期信号と同じ周期を有する信号の振幅が所定値となるように前記半導体レーザの出力波長を制御することを特徴とする、請求項１記載の波長制御装置。The degree of modulation of the semiconductor laser and the intensity modulation unit so that the intensity modulation component due to the periodic signal and the intensity modulation component due to the output signal of the polarity inversion unit partially cancel each other in the output light of the intensity modulation unit Is set,
Wherein the amplitude of the signal having the same period as the periodic signal detected by said control signal detecting unit controls the output wavelength of the semiconductor laser to a predetermined value, the wavelength control apparatus according to claim 1, wherein .
所定の周期信号によって光信号の波長を変調し、
変調された光信号を光フィルタで抽出し、
抽出された光信号を光電気変換し、
光電気変換された信号から前記周期信号と同じ周期を有する信号を抽出し、
前記抽出された周期信号と同じ周期を有する信号の振幅及び位相が所定値となるように光信号の中心波長を制御する波長制御方法。A wavelength control method for controlling the wavelength of an optical signal,
Modulates the wavelength of the optical signal by a predetermined periodic signal,
The modulated optical signal is extracted with an optical filter,
Photoelectric conversion of the extracted optical signal,
Extracting a signal having the same period as the periodic signal from the photoelectrically converted signal ,
Wavelength control method in which the amplitude and phase of a signal having the same period as the extracted periodic signal to control the central wavelength of the optical signal to a predetermined value.
所定波長の光を出力する半導体レーザと、A semiconductor laser that outputs light of a predetermined wavelength;
入力される制御信号に応じて前記半導体レーザの波長を制御する波長制御部と、A wavelength control unit that controls the wavelength of the semiconductor laser in accordance with an input control signal;
周期性を有する周期信号を発生する周期信号源と、A periodic signal source for generating a periodic signal having periodicity;
前記周期信号と所定のバイアス値を重畳した電流信号で前記半導体レーザを駆動する電流源と、A current source that drives the semiconductor laser with a current signal in which the periodic signal and a predetermined bias value are superimposed;
前記周期信号の極性を反転させる極性反転部と、A polarity inversion unit for inverting the polarity of the periodic signal;
前記極性反転部から出力された信号とデータとを多重する多重部と、A multiplexing unit that multiplexes the signal and data output from the polarity inversion unit;
前記多重部から出力された信号により前記半導体レーザから出力される光を強度変調する強度変調部と、An intensity modulating unit that modulates the intensity of light output from the semiconductor laser by a signal output from the multiplexing unit;
前記強度変調部から出力された光信号を、該光信号とは波長の異なる他の光信号と合波する波長多重部と、A wavelength multiplexing unit that combines the optical signal output from the intensity modulation unit with another optical signal having a wavelength different from that of the optical signal;
前記波長多重部で合波された光信号を伝播させる光伝送路と、An optical transmission line for propagating the optical signal combined by the wavelength multiplexing unit;
前記光伝送路中を伝播した光信号の中から前記強度変調部から出力された光信号を分離する波長分離部と、A wavelength separation unit for separating the optical signal output from the intensity modulation unit from the optical signal propagated in the optical transmission path;
前記波長多重部または前記波長分離部の透過特性に応じて抽出された光信号を電気信号に変換する光電気変換部と、A photoelectric conversion unit that converts an optical signal extracted according to transmission characteristics of the wavelength multiplexing unit or the wavelength separation unit into an electrical signal;
前記光電気変換部より出力される電気信号から前記周期信号と同じ周期を有する信号を抽出し、当該抽出された前記周期信号と同じ周期を有する信号に基づき制御信号を前記波長制御部に送る制御信号検出部とを備える波長分割多重伝送システム。Control that extracts a signal having the same cycle as the periodic signal from the electrical signal output from the photoelectric conversion unit, and sends a control signal to the wavelength control unit based on the extracted signal having the same cycle as the periodic signal A wavelength division multiplexing transmission system comprising a signal detection unit.
所定波長の光を出力する半導体レーザと、A semiconductor laser that outputs light of a predetermined wavelength;
入力される制御信号に応じて前記半導体レーザの波長を制御する波長制御部と、A wavelength control unit that controls the wavelength of the semiconductor laser in accordance with an input control signal;
周期性を有する周期信号を発生する周期信号源と、A periodic signal source for generating a periodic signal having periodicity;
前記周期信号と所定のバイアス値を重畳した電流信号で前記半導体レーザを駆動する電流源と、A current source that drives the semiconductor laser with a current signal in which the periodic signal and a predetermined bias value are superimposed;
前記周期信号の極性を反転させる極性反転部と、A polarity inversion unit for inverting the polarity of the periodic signal;
前記極性反転部から出力された信号とデータとを多重する多重部と、A multiplexing unit that multiplexes the signal and data output from the polarity inversion unit;
前記多重部から出力された信号により前記半導体レーザから出力される光を強度変調する強度変調部と、An intensity modulation unit for intensity-modulating light output from the semiconductor laser by a signal output from the multiplexing unit;
前記強度変調部から出力された光信号を、該光信号とは波長の異なる他の光信号と合波する波長多重部とを備える光送信装置。An optical transmission device comprising: a wavelength multiplexing unit that multiplexes an optical signal output from the intensity modulation unit with another optical signal having a wavelength different from that of the optical signal.
所定波長の光を出力する半導体レーザと、A semiconductor laser that outputs light of a predetermined wavelength;
入力される制御信号に応じて前記半導体レーザの波長を制御する波長制御部と、A wavelength control unit that controls the wavelength of the semiconductor laser in accordance with an input control signal;
周期性を有する周期信号を発生する周期信号源と、A periodic signal source for generating a periodic signal having periodicity;
前記周期信号と所定のバイアス値を重畳した電流信号で前記半導体レーザを駆動する電流源と、A current source that drives the semiconductor laser with a current signal in which the periodic signal and a predetermined bias value are superimposed;
前記周期信号の極性を反転させる極性反転部と、A polarity inversion unit for inverting the polarity of the periodic signal;
前記極性反転部から出力された信号とデータとを多重する多重部と、A multiplexing unit that multiplexes the signal and data output from the polarity inversion unit;
前記多重部から出力された信号により前記半導体レーザから出力される光を強度変調する強度変調部と、An intensity modulating unit that modulates the intensity of light output from the semiconductor laser by a signal output from the multiplexing unit;
前記強度変調部から出力される光信号を波長に応じた透過率で透過する光フィルタ手段と、An optical filter means for transmitting an optical signal output from the intensity modulator with a transmittance according to the wavelength;
前記光フィルタ手段を透過した光信号を電気信号に変換する光電気変換部と、A photoelectric conversion unit that converts an optical signal transmitted through the optical filter means into an electrical signal;
前記光電気変換部より出力される電気信号から前記周期信号と同じ周期を有する信号を抽出し、当該抽出された前記周期信号と同じ周期を有する信号に基づき制御信号を前記波長制御部に送る制御信号検出部とをそれぞれ複数組備え、Control that extracts a signal having the same cycle as the periodic signal from the electrical signal output from the photoelectric conversion unit, and sends a control signal to the wavelength control unit based on the extracted signal having the same cycle as the periodic signal Provide multiple sets of signal detectors,
前記フィルタ手段が、それぞれ所定の波長の光信号のみを透過する複数の入力端子と１つの出力端子とを有し、各前記入力端子より入力される、前記複数の強度変調部から出力された互いに波長の異なる光信号を波長多重して前記出力端子から出力する波長多重部であり、The filter means has a plurality of input terminals and one output terminal each transmitting only an optical signal having a predetermined wavelength, and is output from the plurality of intensity modulation units input from the input terminals. A wavelength multiplexing unit that wavelength-multiplexes optical signals having different wavelengths and outputs them from the output terminal;
前記複数の周期信号源が出力する周期信号の周波数は互いに異なり、The frequency of the periodic signal output from the plurality of periodic signal sources is different from each other,
前記複数の制御信号検出部は、それぞれ対応する前記周期信号源から出力される周期信号と同じ周期を有する信号のみを抽出する光送信装置。The plurality of control signal detectors extract only signals having the same period as the periodic signal output from the corresponding periodic signal source.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002056086A JP4150193B2 (en) | 2002-03-01 | 2002-03-01 | Wavelength control apparatus and wavelength control method |
| US10/373,699 US6891995B2 (en) | 2002-03-01 | 2003-02-27 | Wavelength division multiplex transmission system |
| CN03110725.7A CN1450732A (en) | 2002-03-01 | 2003-02-28 | Wavelength division multiplex transmission system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002056086A JP4150193B2 (en) | 2002-03-01 | 2002-03-01 | Wavelength control apparatus and wavelength control method |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| JP2003258373A JP2003258373A (en) | 2003-09-12 |
| JP2003258373A5 true JP2003258373A5 (en) | 2005-08-25 |
| JP4150193B2 JP4150193B2 (en) | 2008-09-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2002056086A Expired - Fee Related JP4150193B2 (en) | 2002-03-01 | 2002-03-01 | Wavelength control apparatus and wavelength control method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP4150193B2 (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4652723B2 (en) * | 2004-06-01 | 2011-03-16 | 三菱電機株式会社 | Optical add / drop multiplexer, optical add / drop multiplexer, wavelength division multiplexing transmission system, and wavelength multiplexing transmission system control method |
| JP5030205B2 (en) * | 2005-12-01 | 2012-09-19 | 日本電信電話株式会社 | Wavelength stabilization apparatus and wavelength stabilization method |
| JP2007158251A (en) * | 2005-12-08 | 2007-06-21 | Nippon Telegr & Teleph Corp <Ntt> | Wavelength stabilization apparatus and wavelength stabilization method |
| JP2008288389A (en) * | 2007-05-17 | 2008-11-27 | Nippon Telegr & Teleph Corp <Ntt> | Wavelength stabilizing unit |
| US8718476B2 (en) * | 2008-02-27 | 2014-05-06 | Xtera Communications, Inc. | Tunable optical discriminator |
| SE534444C2 (en) * | 2008-10-28 | 2011-08-23 | Syntune Ab | Communication system comprising a tunable laser. |
| JP6499516B2 (en) * | 2015-06-02 | 2019-04-10 | 日本電信電話株式会社 | Optical transmission / reception system |
-
2002
- 2002-03-01 JP JP2002056086A patent/JP4150193B2/en not_active Expired - Fee Related
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