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EP1378076A2 - Regenerateur 3r a conversion de longueur d'onde - Google Patents

Regenerateur 3r a conversion de longueur d'onde

Info

Publication number
EP1378076A2
EP1378076A2 EP02729867A EP02729867A EP1378076A2 EP 1378076 A2 EP1378076 A2 EP 1378076A2 EP 02729867 A EP02729867 A EP 02729867A EP 02729867 A EP02729867 A EP 02729867A EP 1378076 A2 EP1378076 A2 EP 1378076A2
Authority
EP
European Patent Office
Prior art keywords
decision maker
wavelength
regenerator according
linear
regenerator
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.)
Withdrawn
Application number
EP02729867A
Other languages
German (de)
English (en)
Inventor
Bernd Sartorius
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fraunhofer Gesellschaft zur Foerderung der Angewandten Forschung eV
Original Assignee
Fraunhofer Gesellschaft zur Foerderung der Angewandten Forschung eV
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Fraunhofer Gesellschaft zur Foerderung der Angewandten Forschung eV filed Critical Fraunhofer Gesellschaft zur Foerderung der Angewandten Forschung eV
Publication of EP1378076A2 publication Critical patent/EP1378076A2/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/29—Repeaters
    • H04B10/291—Repeaters in which processing or amplification is carried out without conversion of the main signal from optical form
    • H04B10/299—Signal waveform processing, e.g. reshaping or retiming
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L7/00—Arrangements for synchronising receiver with transmitter
    • H04L7/0075—Arrangements for synchronising receiver with transmitter with photonic or optical means
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S5/00—Semiconductor lasers
    • H01S5/005—Optical components external to the laser cavity, specially adapted therefor, e.g. for homogenisation or merging of the beams or for manipulating laser pulses, e.g. pulse shaping
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S5/00—Semiconductor lasers
    • H01S5/06—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium
    • H01S5/062—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium by varying the potential of the electrodes
    • H01S5/0625—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium by varying the potential of the electrodes in multi-section lasers
    • H01S5/06253—Pulse modulation
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S5/00—Semiconductor lasers
    • H01S5/50—Amplifier structures not provided for in groups H01S5/02 - H01S5/30
    • H01S5/5054—Amplifier structures not provided for in groups H01S5/02 - H01S5/30 in which the wavelength is transformed by non-linear properties of the active medium, e.g. four wave mixing

Definitions

  • the invention relates to a 3R regenerator with wavelength conversion, comprising means for clock regeneration, a non-linear decision maker and means for generating and / or adjusting the output wavelength.
  • Optical 3R regeneration (re-amplification / amplitude of the signal; re-shaping / form of the signal; re-timing / temporal position of the signal) is a key function for transparent optical data networks.
  • the important functional blocks are the clock regeneration, which generates a stream of light pulses, which is synchronized to the data signal, and the decision element, which has an almost digital switching function to distinguish noise and signal pulses.
  • Another important parameter for current WDM (wavelength division multiplexing) systems is the output wavelength of the regenerated signal. This must fit exactly into the standardized wavelength grid and should be freely selectable within it.
  • the standard structure of an optical 3R regenerator uses a nonlinear optical switch as a decision element, which is controlled by the data signal and either blocks or allows the clock pulses to pass or pass depending on the "0" or "1" bit (see, for example, ECOC 2000, Kunststoff, invited paper We 9.4.1, Conf. Dig. We pp. 293-296).
  • Re-timing and re-shaping is achieved in that the switching window is longer in time than the clock pulses.
  • the pulse shape and temporal jitter in the data signal are not transferred to the pulse shape and timing of the output signal and timing is only influenced by the clock pulses.
  • the wavelength of the output signal is also determined by the clock pulses. For each wavelength in the grid, a special clock regenerator, which is a complex component, must be manufactured or an additional wavelength conversion must be added to the 3R regenerator.
  • 3R regenerators digitally switching lasers are used as decision-making elements, such as in ELECTRONIC LETTERS 28 th September 1989 Vol. 25 No. 20 pp. 1332-1333 and SPIE Vol. 2954, pp. 30-41.
  • a decision-making laser which is also a complicated component, defines the output wavelength of the 3R regenerator.
  • a suitable decision maker has to be made for each wavelength or an additional wavelength conversion has to be added.
  • Interferometers with only one semiconductor amplifier for example the generally known structures “UNI” and “SLALOM”, are particularly easy to implement and operate stably.
  • the overall most favorable structure shows the asymmetrical "delayed interference" interferometer, as described in OFC 2000, Postdeadline Paper PD17-1 to -17-3.
  • the semiconductor amplifier is not located inside the interferometer here, but in front of it. amplifier and asymmetric interferometer networks can therefore be easily made from different materials and optimized separately. Only for the semiconductor amplifier is polarization independence important.
  • this type of interferometer has the disadvantage that the controlled signal must always be a constant signal. Therefore, the conventional 3R regenerator can be used with the Decision makers as switches for the clock pulses do not have this favorable interferometric structure.
  • Th F7-1 / 93 to Th F7-3 / 93 describes a 3R regenerator with wavelength conversion, which in two separate function blocks realizes a 3R regeneration and a wavelength conversion to a DFB laser.
  • the arrangement described for the 3R regenerator has means for clock regeneration and a non-linear decision-maker and as a means for generating and / or setting a desired wavelength, a further non-linear functional element and a DFB laser. Because of the need for a second function block for the wavelength conversion, the solution described is technically complex and expensive.
  • the object of the invention is now to provide a 3R regenerator with adjustable output wavelength, i.e. Both the 3R regeneration and an adjustable wavelength conversion should be possible with one component.
  • the 3R regenerator should be able to be implemented with components that are technically less complex than in the prior art.
  • the means for generating and / or adjusting the output wavelength is an additional laser which is constantly operated with the means for the clock regeneration and for the decision maker and is connected to the decision maker and its light With the desired wavelength, it radiates that a delay line is arranged between the means for the clock regeneration and the decision maker, via which a pulse of the data signal via the optical delay line is delayed by about half a bit in the time gap between two pulses of the clock signal is, the pulses of the data and clock signal and the radiated constant signal to avoid interference have different wavelength or polarization or beam direction, and a means for adjusting the power of the data and clock pulses is arranged in front of the decision maker, via which these powers are adjusted so that both the effect on the non-linear decision maker is approximately the same as that of the decision maker is safely switchable.
  • the solution according to the invention with which both a 3R regeneration and a wavelength conversion can be implemented, only requires a constantly operated external laser of the new target wavelength in addition to the clock regenerator and the non-linear switch as a decision maker. These relatively simple lasers are manufactured in large numbers in the required wavelength pattern and are available at low cost. The wavelength-tunable lasers that are now available can also be used for the solution according to the invention. With these, the 3R regenerator according to the invention can then be adjusted to any desired
  • Output wavelength can be set.
  • such a combination of the timing of the data and clock pulses is realized in the decider element that the data pulses are delayed by about half a bit in the time gap between two clock pulses and are thus radiated into the decision element (alternating clock-data control).
  • Data and clock signals differ in wavelength or polarization or beam direction in the decision element so that interference is avoided and only the power of the data and clock pulses is combined (added).
  • the power of these pulses is realized by means of the power setting means so that their effect on the decision element is approximately the same, ie effects by different wavelengths or polarization or beam direction are largely compensated for by a suitable power setting.
  • the additional, constantly operated laser is a laser with a fixed wavelength or a laser which can be tuned in its wavelength and is monolithically integrated with the decision maker.
  • the nonlinear decision maker is a semiconductor amplifier, for example a semiconductor amplifier whose band gap is shifted so that it is largely transparent in the region of the controlled signal, or a saturable absorber or an electroabsorption waveguide or a nonlinear fiber or a nonlinear crystal ,
  • the non-linear decision maker with an interferometer which is operated, for example, asymmetrically delayed or operated differentially.
  • the output signal is inverted with respect to the logic. It is therefore provided in another embodiment that a two-stage arrangement is provided for resetting the inverted signals.
  • the invention is described in more detail in the following embodiment with reference to drawings.
  • FIG. 1 shows schematically the structure of a 3R regenerator according to the invention with adjustable wavelength
  • Fig. 2 the pulse course of the signals before and after the decision maker.
  • the data signal DS is fed into the means for the clock regeneration 1, as shown in FIG. 1.
  • a delay line 3 is arranged between this 1 and the decision maker 2.
  • Also in front of the decision maker 2 is a means for setting the power 4 of the data DS and clock signals TS.
  • the decision maker 2 is connected to a constantly operated laser 5.
  • the data signal DS has "one" bits
  • an alternating activation by data DS and clock signal TS of the decision-maker 2 is realized by means of the delay line 3 mentioned, as can be seen from FIG. 2.
  • the means for power setting 4 of the data DS and clock signals TS then guarantees that an almost constant power level is set, thus the decision maker 2 is kept constantly in a defined state, small power fluctuations due to data degradation are intercepted by the threshold value function of the decision maker 2.
  • the decision maker 2 switches over to the other state.
  • re-timing and the shape of the switching function (re-shaping) only depend on the timing and shape of the adjacent clock pulses as well as the transmission form of the decision-maker 2 and are - up to certain limits - not affected by degradations (time jitter, amplitude fluctuations) of the data signal arrangement according to the invention realizes the re-timing and re-shaping function required for the 3R regeneration.
  • the transmission of the combined data clock signal DTS to this new wavelength, with which the output signal AS leaves the arrangement according to the invention.
  • the decision maker can be formed from very different elements with a non-linear function, i.e. not only components with a switch function can be used for the pulses.
  • any arrangement of a non-linear wavelength conversion can be expanded to a constant signal with the aid of the arrangement according to the invention to form a 3R regenerator with an adjustable output wavelength.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Electromagnetism (AREA)
  • Optics & Photonics (AREA)
  • Optical Communication System (AREA)
  • Semiconductor Lasers (AREA)
  • Lasers (AREA)

Abstract

L'objectif de cette invention est de réaliser à la fois une régénération 3R et une conversion de longueur d'onde ajustable avec un seul composant. Le régénérateur 3R doit être conçu à l'aide de composants techniquement moins complexes que ceux de la technique actuelle. Selon cette invention, dans un régénérateur 3R à conversion de longueur d'onde comprenant un moyen pour la régénération d'horloge, un discriminateur non linéaire et un moyen conçu pour produire et/ou ajuster la longueur d'onde de sortie, ce moyen de production et/ou réglage de la longueur d'onde de sortie est un laser fonctionnant de façon constante en plus du moyen de régénération d'horloge et du discriminateur, lequel laser est relié au discriminateur qui est pénétré par la lumière du laser selon la longueur d'onde désirée. Un circuit de retard est placé entre le moyen de régénération d'horloge et le discriminateur. Une impulsion du signal de données, retardée par le circuit de retard optique d'environ un demi bit, est appliquée dans l'intervalle temporel entre deux impulsions du signal d'horloge. Afin d'éviter des interférences, les impulsions du signal de données et du signal d'horloge ainsi que le rayonnement laser émis présentent une longueur d'onde ou une polarisation ou une direction de faisceau différentes. En outre, un moyen servant à régler la puissance des impulsions de données et d'horloge est agencé en amont du discriminateur et utilisé pour régler ces puissances, de façon à obtenir un effet presque identique sur le discriminateur non linéaire et à permettre une commutation en toute sécurité de ce discriminateur.
EP02729867A 2001-04-10 2002-04-04 Regenerateur 3r a conversion de longueur d'onde Withdrawn EP1378076A2 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10118958 2001-04-10
DE10118958A DE10118958B4 (de) 2001-04-10 2001-04-10 Optischer 3R Regenerator mit Wellenlängenumsetzung
PCT/DE2002/001340 WO2002084900A2 (fr) 2001-04-10 2002-04-04 Regenerateur 3r a conversion de longueur d'onde

Publications (1)

Publication Number Publication Date
EP1378076A2 true EP1378076A2 (fr) 2004-01-07

Family

ID=7681822

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02729867A Withdrawn EP1378076A2 (fr) 2001-04-10 2002-04-04 Regenerateur 3r a conversion de longueur d'onde

Country Status (6)

Country Link
US (1) US20040131364A1 (fr)
EP (1) EP1378076A2 (fr)
JP (1) JP2004530361A (fr)
CA (1) CA2443612A1 (fr)
DE (1) DE10118958B4 (fr)
WO (1) WO2002084900A2 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10344319A1 (de) * 2003-09-19 2005-04-28 Fraunhofer Ges Forschung Wellenlängen-erhaltender optischer Signalregenerator
US7590358B2 (en) * 2005-02-28 2009-09-15 Vladimir Grigoryan Optical regenerative amplifier for binary phase shift-keying signals

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2658956B2 (ja) * 1995-03-24 1997-09-30 日本電気株式会社 光識別再生回路
DE19606321A1 (de) * 1996-02-09 1997-08-14 Hertz Inst Heinrich Schaltungsanordnung zur Erzeugung von regenerierten optischen Taktpulsfolgen
JP3976788B2 (ja) * 1996-03-29 2007-09-19 フラウンホーファー‐ゲゼルシャフト ツル フェルデルング デル アンゲヴァンテン フォルシュング エー ファウ Ｑスイッチ半導体レーザ
JP2964984B2 (ja) * 1997-04-03 1999-10-18 日本電気株式会社 光スイッチ装置
JP3882979B2 (ja) * 1999-10-15 2007-02-21 富士通株式会社 波形整形のための装置及びシステム
JP2001183714A (ja) * 1999-12-27 2001-07-06 Kddi Corp 光波形整形装置
JP4454763B2 (ja) * 2000-03-03 2010-04-21 富士通株式会社 信号光を波形整形するための方法、装置及びシステム
JP4689008B2 (ja) * 2000-07-04 2011-05-25 富士通株式会社 信号光を波形整形するための方法及び装置
US6437905B1 (en) * 2000-07-07 2002-08-20 Lucent Technologies Inc. Optical wavelength converter
CA2636572C (fr) * 2000-10-06 2010-08-17 Alphion Corporation Methode de remise en forme, regeneration et recalage des signaux de donnees optiques, et semiconducteur applicable
US6931212B2 (en) * 2000-12-22 2005-08-16 Lucent Technologies Inc. 3R optical signal regeneration
US6563627B2 (en) * 2001-04-06 2003-05-13 Sung-Joo Ben Yoo Wavelength converter with modulated absorber

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO02084900A2 *

Also Published As

Publication number Publication date
JP2004530361A (ja) 2004-09-30
CA2443612A1 (fr) 2002-10-24
WO2002084900A2 (fr) 2002-10-24
WO2002084900A3 (fr) 2003-01-30
DE10118958B4 (de) 2006-11-09
US20040131364A1 (en) 2004-07-08
DE10118958A1 (de) 2002-11-07

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