[go: up one dir, main page]

WO2003013032A1 - Regeneration de signal optique - Google Patents

Regeneration de signal optique Download PDF

Info

Publication number
WO2003013032A1
WO2003013032A1 PCT/AU2002/001018 AU0201018W WO03013032A1 WO 2003013032 A1 WO2003013032 A1 WO 2003013032A1 AU 0201018 W AU0201018 W AU 0201018W WO 03013032 A1 WO03013032 A1 WO 03013032A1
Authority
WO
WIPO (PCT)
Prior art keywords
pulses
signal
pump
waveguide
optical signal
Prior art date
Application number
PCT/AU2002/001018
Other languages
English (en)
Inventor
Gregory Raymond Collecutt
Peter David Drummond
Original Assignee
The University Of Queensland
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 The University Of Queensland filed Critical The University Of Queensland
Publication of WO2003013032A1 publication Critical patent/WO2003013032A1/fr

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
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/35—Non-linear optics
    • G02F1/353—Frequency conversion, i.e. wherein a light beam is generated with frequency components different from those of the incident light beams
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/35—Non-linear optics
    • G02F1/39—Non-linear optics for parametric generation or amplification of light, infrared or ultraviolet waves

Definitions

  • This invention relates to optical signal processing, particularly (but not solely) for use in telecommunications applications.
  • the invention is directed to a method and apparatus for ail-optically regenerating an optical binary data stream within a single mode waveguide, so that the optical pulses of the data stream are re-amplified, re-timed, re-shaped and re-tuned.
  • the common method of transmitting data within an optical fibre is to convert it into binary form and send it through the fibre as a sequence of pulses of laser light. That is, a binary "1" is usually represented by the presence of a pulse, while a binary "0” is usually represented by the absence of a pulse.
  • the pulses (or absence of pulses) are spaced at predetermined intervals.
  • the rate at which the pulses appear is known as the bit rate.
  • Such pulsing of laser light can be thought of as an amplitude modulation of some base carrier frequency, ⁇ .
  • This amplitude modulation causes the signal to be comprised of many frequency components spread over the range ⁇ b , where 2 ⁇ b may be considered to be the bandwidth of the signal.
  • the bandwidth of the signal is inversely proportional to duration of the pulses. Transmitting data at a faster bit rate necessitates the use of shorter pulses, and so the bandwidth of the signal becomes proportional to the data rate.
  • data rate and signal bandwidth are commonly used interchangeably.
  • each pulse of light on an individual basis, exhibits the following properties:
  • Half duration time or half-width which typically is defined as the time period for which the intensity of the pulse is greater than half of its maximum intensity.
  • fibre-laser it is already known to use a fibre-laser to amplify signals propagating in an optical fibre, solely by optical means ("ail-optically").
  • known fibre-lasers have two significant limitations. First, they have restricted bandwidth, and are therefore not suitable for re-amplifying signals with a high bandwidth (which are commonly referred to as broadband signals).
  • the fibre-lasers add an additional random error to the centre frequency, ⁇ c , of the signal pulses. This is a problem because of a technical property of the fibre known as dispersion, or sometimes group velocity dispersion, as explained below.
  • phase velocity The velocity with which the wave crests of the carrier wave travel is called the phase velocity, and is given by ⁇
  • the group velocity the velocity with which the modulation (i.e. the envelope of the wave packet) of the waves travels.
  • Group velocity dispersion is the rate at which the group velocity changes with frequency. Its most common definition is
  • the effect of group velocity dispersion is to cause the different frequency components within a single pulse to travel at different speeds, the net result being that after some propagation the pulse becomes chirped.
  • This is a term used to describe a pulse where higher frequency components end up at one end of the pulse, and lower frequency components at the other, causing the duration of the pulse to increase, and the pulse shape to "slump".
  • This effect can be negated over short distances either by using (near) zero dispersion fibre, or pre- or post-chirping the pulses with the opposite amount of chirp to that which they receive in the fibre.
  • pulses with different centre frequencies travel at different speeds. This in turn means that after amplification by known optical amplifiers, and some distance of further propagation, the time centres, t c , of the pulses exhibit a random deviation, or jitter, known as Gordon-Haus jitter.
  • the pulses exhibit perturbations in all four of the above mentioned characteristics, namely: energy, timing, frequency, and duration. These perturbations must be corrected before the signal becomes too degraded or scrambled to permit the binary data to be recovered.
  • Re-shaping primarily means correcting for the slump in pulse shape caused by dispersion, which can be considered as being correction of perturbations in pulse duration.
  • the invention provides a method of ail-optically regenerating an optical signal comprising a series of pulses of light of a nominal carrier frequency, the method including the steps of: providing a source of periodic pump pulses of light having a predetermined centre frequency, combining the optical signal with the pump pulses so that the pulses of the optical signal are concurrent with corresponding ones of the pump pulses, and propagating the combined signals through an optical waveguide so that the signals interact in a spatially dependent manner, wherein the pump pulses selectively amplify frequency components of the signal pulses that travel at the same speed as the pump pulses
  • the invention provides apparatus for Apparatus for all-optically regenerating an optical signal comprising a series of pulses of light of a nominal carrier frequency, the apparatus including: a source of periodic pump pulses of light having a predetermined centre frequency, a coupler for combining the optical signal pulses with the pump pulses so that the pulses of the optical signal are concurrent with corresponding ones of the pump pulses, and an optical waveguide connected to the output of the coupler such that, in use, the combined signals from the coupler propagate through the waveguide and interact in a spatially dependent manner, and wherein the pump pulses selectively amplify frequency components of the signal pulses that travel at the same speed as the pump pulses.
  • the source of periodic pump pulses is a mode locked pump laser that generates a uniform stream of pulses having a bit rate which is derived from the optical signal, e.g. by averaging.
  • Such "timing recovery” ensures that, over a long term average, the pump pulses remain synchronised with the signal data stream (whose interval period may suffer longer term drift).
  • the pump pulses have the same pulse duration (when non-chirped) as the nominal signal pulses (i.e. before degradation).
  • the pump pulses may or may not be of the same carrier frequency as the signal pulses, and are of significantly higher energy than the signal pulses.
  • the pump laser light is distinguishable from the signal pulse light by having a different carrier frequency and/or being orthogonally polarised to the signal light.
  • the signal pulses are combined with the pump pulses in a 3dB optical coupler, or similar device, so that the pulses are concurrent or otherwise aligned within the same physical space.
  • the waveguide is typically a length of single mode optical waveguide that exhibits an interaction mechanism, so that energy may transfer from the pump pulses to the signal pulses in regions where they are spatially coexistent. Examples of such interaction mechanisms include type I and type II ⁇ ⁇ 2) nonlinearity, four wave mixing using the self or cross (3) nonlinearity, and Raman interaction.
  • the waveguide exhibits sufficient dispersion at the signal carrier frequency so that the length of the waveguide represents of order 1 dispersion length for the signal pulses.
  • the waveguide is constructed so that: (i) the pump signal centre frequency and the signal pulse carrier frequency have sufficiently identical phase velocity so that the relative phase between them does not shift by more than about — within the length of
  • phase matching the waveguide
  • the pump pulse centre frequency has the same group velocity as that of the signal pulse carrier frequency to which the optical signal is being regenerated (known as group velocity matching).
  • the energy of the pump pulses is sufficient high to ensure that amplification of a nominal signal pulse reaches saturation, i.e. its maximum value.
  • the amplified signal pulses are isolated from the combined signals, e.g. by filtering.
  • Low level noise may suitably be removed from the filtered amplified signal, e.g. by using a saturable absorber. This enables such regeneration to be used repeatedly without substantial degradation of the signal to noise ratio.
  • the dispersion of the waveguide at the pump pulse centre frequency may be tailored so that the length of the waveguide also represents of order 1 dispersion length for the pump pulses.
  • the pump pulses may also be chirped so that, in the absence of a signal pulse, they are fully focused, i.e. they focus (or "waist") at some predetermined distance within the waveguide. This enables a greater range of timing error in the input signal to be regenerated.
  • this invention is able to extend significantly the band with of optical signals which can be amplified, as the interaction mechanism represents the primary limiting factor with regard to amplification band with.
  • Fig. 1 is a schematic block diagram of an optical signal re-generator according to one embodiment of the invention
  • Fig. 2 is a diagram illustrating the relative timing and strengths of the signal and pump fields at point A in Fig. 1 ;
  • Fig. 3 is a diagram illustrating the relative timing and strengths of the signal and pump fields at point B in Fig. 1.
  • this embodiment may operate in a polarisation sensitive, and a polarisation insensitive mode of operation. Further, it can be used to amplify either all of the signals in the fibre together, or (in a parallel, multiplexed configuration) just those signals occupying a specified window or frequency band. In the latter configuration, several substantially identical regenerators are normally used, and if each wavelength band was driven originally from the same clock then these parallel regenerators may be synchronised via the same timing recovery mechanism.
  • FIG. 1 A schematic diagram of a signal regenerator 10 according to a preference embodiment of the invention is shown in Fig. 1.
  • An optical waveguide such as an optical fibre, serves as an input signal line 1 containing the optical signal pulses to be regenerated.
  • the input pulses are plane polarised with a known polarisation, which is that of the signal mode of the waveguide.
  • the input signal has a nominal carrier frequency of ⁇ s .
  • the signal regenerator 10 also includes a pump laser source 2.
  • the pump laser produces periodic pulses of coherent, near monochromatic, plane polarised laser light at frequency ⁇ p .
  • the polarisation matches that of the pump mode of the ⁇ ⁇ 2) waveguide 5 (described below), and are output from the pump laser 2 to a fibre coupler 4 via an optical fibre or other suitable waveguide.
  • the input signal pulses are fed by the input signal line 1 to the fibre coupler 4 also.
  • the pump laser 2 is adjustable to vary the energy of the pump pulses.
  • the pump laser pulses should have an approximately Gaussian temporal profile of similar duration (non-chirped) to the nominal input signal pulse duration.
  • the pump pulses are also produced with the same pulse interval period or bit rate as the input signal, and they are synchronised, on average, with the input signal pulses so that a pump pulse and a correctly timing signal pulse are concurrent once the two are mixed at the fibre coupler 4 (as described below).
  • the quality of the output timing is directly related to the quality of the pump pulse timing.
  • the pump output pulses may be chirped so that (in the absence of a signal pulse) they focus or waist by the end of propagation through the ⁇ ⁇ 2) waveguide 5. This is further explained below. Although the performance of the signal regenerator 10 may be improved through the use of such chirped pump pulses, this is not essential.
  • the pump laser 2 may be constructed from any number of component lasers, providing the final output pulses are as stated above.
  • the fibre coupler 4 is preferably a 3dB or similar coupler which mixes the output pulses of the pump laser 2 with the incoming optical signals in input signal line 1.
  • the fibre coupler is a common device used in the telecommunications industry, and need not be described in detail in this application.
  • the superposed signals at the output A of the fibre coupler 4 are shown in Fig. 2 (in computer simulated form) in which the field power of the signals is shown as a function of time.
  • the time coordinate is normalised to units of input pulse width, while the power coordinate is expressed in arbitrary units.
  • the signal is a binary signal, with ones represented by pulses, while zeros are represented by the absence of a pulse.
  • the energy and time centres of the signal pulses have been varied slightly to simulate data in need of regeneration. Note also that the signal intensity has been enlarged by a factor of 1000 so that it can be easily seen alongside the pump pulses on a linear scale].
  • the input signal pulses overlap with pump pulses.
  • the signal regenerator also includes means for maintaining the synchronisation between the pump pulses and the input signal pulses. If this invention were being built into an integrated photonics circuit, such synchronisation may be derived from a central oscillator. However, in a communication network, the synchronisation would normally be derived independently at each regeneration station.
  • a synchronisation feedback mechanism 3 is connected between the output of the fibre coupler 4 and the pump laser 2, and is used to adjust the pulse repetition rate of the pump laser 2 so that, on average, the output pulses from the pump laser 2 are synchronised with the signal pulses in the input signal line 1.
  • Such synchronisation feedback mechanisms are known in the art, and need not be described in detail in this application.
  • the signal regenerator includes a ⁇ 2) nonlinear single mode waveguide 5 as a fundamental component thereof.
  • the waveguide 5 may be a graded refractive index channel written within a large amount of bulk crystal.
  • a suitable material for type II interaction is lithium niobate (LiNbO 3 ) carefully grown as a single crystal, or else grown as a periodically poled crystal (often referred to as PPLN, or Periodically Poled Lithium Niobate).
  • PPLN periodically poled crystal
  • Lithium Niobate Periodically Poled Lithium Niobate
  • the dispersion of the waveguide material at the pump laser wavelength should preferably be equal to, or less than, the dispersion at the signal wavelength. If it is of similar magnitude then "chirping" of the pump pulses may be advantageous as chirped pump pulses are broader in duration to begin with, and then bunch up or focus as they propagate in the waveguide. This enables a greater range of timing error in the signal pulses to be corrected for. On the other hand, if the dispersion at the pump frequency is significantly less than the dispersion at the signal frequency, there will be little advantage in using chirped pump pulses since little focusing effect may be obtained. These dispersions are either both normal, or both anomalous. (In other words ⁇ 2 (k P ) and ⁇ 2 (k s ) are of the same sign).
  • the length of the waveguide 5 ought to be such that the signal pulses undergo of order 1 dispersion length within the waveguide, or mathematically ⁇ 2 (k s )L
  • the pump pulse energy is adjusted so that a nominal signal pulse causes the maximum possible conversion of energy from pump field to signal and idler fields (saturation).
  • the output from the waveguide 5, at point B in Fig. 1, is shown in Fig. 3. It is to be noted that the pump pulses have been depleted where they coincide with signal pulses, and the signal pulses have been regenerated in terms of both energy and timing. This regeneration process also corrects variations in signal centre frequency and pulse width. Smaller signal pulses undergo proportionally more amplification than larger signal pulses.
  • the signal pulses are amplified by energy conversion from the pump field mode, and since the energy in the pump mode is localised in space and travelling with a known group velocity, the amplification process is strongest for frequency components of the signal pulse that travel in step with the pump pulse.
  • the pump pulses which are spatially superposed with the signal pulses and travel therewith selectively amplify the frequency components of the signal pulses that travel at the same speed on the pump pulses. Hence the signal pulses are "re-tuned" to the frequency that has the same group velocity as the pump frequency.
  • the group velocity of the pump pulses must be matched to that of the nominal signal pulse. Mathematically this may be expressed as
  • the output of the waveguide 5 is preferably passed through a colour and polarisation filter 6 to isolate the regenerated signal.
  • a colour and polarisation filter 6 Such filters are commonly used in the telecommunications industry, and need not be described in detail in this application.
  • a saturable absorber 7 is preferably connected to the output of the filter 6 to remove inter-pulse noise from the regenerated signal and thus improve the signal to noise ratio.
  • the saturable absorber 7 has a nonlinear response such that (unwanted) small signals are highly attenuated while the (desired) larger signals are only slightly attenuated. These are known in the art and need not be described in detail.
  • the regenerated signals After passing through the saturable absorber 7, the regenerated signals which have been re-amplified, re-timed, re-shaped and re-tuned, pass into an output signal line 8 to continue propagation in the communications network (not shown).
  • the output signals may be combined with other regenerated signals of a different frequency band if a multiplexed configuration has been used.
  • the connecting optical fibres or other suitable waveguides used within the signal regenerator 10 should preferably be polarisation preserving.
  • the above described signal regenerator device performs very well in computer simulations using non-chirped pump pulses, with the dispersion in the waveguide 5 at the pump wavelength being equal to that at the signal wavelength, and the phase matching being exact.
  • Signal pulse timing and centre frequency at output were primarily only related to their same parameters at input; signal pulse timing errors of up to +o.25t ⁇ were reduced by a factor of 4, and centre frequency errors of up to five times the bit data rate were reduced by a factor of 2.
  • the signal pulse energy and width at output were primarily sensitive only to fluctuations in input signal pulse energy and timing. For fluctuations in input signal pulse energy of ⁇ 3dB , and timing error of ⁇ o.25t A , the fluctuations in output signal pulse energy were about ⁇ dB , and the fluctuations in output signal pulse width were about +0.1t A ⁇
  • the signal regenerator of this invention can correct timing and frequency errors or deviations over a wider range. Preliminary investigations indicate that the input ranges of both timing and frequency errors may be doubled without adversely affecting the output signal pulse energy and width.
  • the polarisation rotation plate and associated electronics can be eliminated by passing the input signal directly into the same polarisation splitter as before, but this time the two outputs are then used as the inputs for two copies of the parametric signal regenerator 10. The two outputs are then recombined by using a polarisation splitter in reverse.
  • this dual regenerator approach one possible disadvantage of this dual regenerator approach is that the total output power now becomes sensitive to the signal polarisation, with possibly about a 2-3dB variation over the range of possible input polarisation angles.
  • the parametric signal regenerator of this invention has the advantage that it enables optical signals to be regenerated over a much greater bandwidth than hitherto possible.
  • a known erbium-doped fibre laser can be used to re-amplify optical signals and has a frequency bandwidth of the order of 1THz, i.e. the maximum signal data rate which this device can successfully re-amplify is around 1THz.
  • the other signal parameters such as timing, width, and tuning, are regenerated electronically.
  • the bandwidth limit for electronic processing is of the order of 10GHz, there is a need for wavelength division multiplexing.
  • the duplication inherent in multiplex circuits adds to the cost of signal regeneration, and also increases transmission times.
  • the parametric signal regenerator of this invention utilises an optical non-linear effect which operates on a femtosecond time scale, and thus its bandwidth is ultimately limited only by the transmission window of the fibre, i.e. around 100THz.
  • the optical signal regenerator of this invention can provide a bandwidth improvement of the order of 100 times greater than current signal regeneration systems.
  • the illustrated components can be implemented physically in any suitable manner, but most preferably in all solid-state configurations using planar integrated optics.
  • type I ⁇ ⁇ 2 type I ⁇ ⁇ 2
  • the signal and idler field modes have the same polarisation, but different (i.e. non-degenerate) frequencies.
  • the same phase matching and group velocity matching requirements must still be met.
  • any parametric three wave mixing or four wave mixing process may be used instead of type I or type II ⁇ ⁇ 2) interactions.
  • Examples include four wave mixing using the self or cross ⁇ ⁇ 3) nonlinearity, or Raman interactions leading to three or four wave mixing.
  • the input can be split into two or more wavelength channels to allow separate amplification of different wavelengths. This may be necessary if design parameters (such as dispersion, group velocity and phase mismatch) require amplification of different parts of the input spectrum with separate regenerators.
  • design parameters such as dispersion, group velocity and phase mismatch
  • a very practical modification of the signal generator 10 is to include photonic crystal technology into the waveguide 5 in order to more precisely engineer the group velocity and dispersion characteristics of the waveguide.

Landscapes

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

Abstract

La présente invention concerne la régénération tout optique d'un signal optique par la mise en oeuvre d'une interaction paramétrique non-dégénérée dans un guide d'onde unidimensionnel (5). Le signal optique (1) comporte une série d'impulsions lumineuses qui ont été dégradées. Les impulsions du signal sont combinées(4) par des impulsions de pompage de lumière (2) d'une énergie, d'une fréquence centrale et d'une durée prédéterminées. Les impulsions de pompage présentent un débit binaire dérivé du signal optique par moyennage. Le impulsions du signal optique se superposent aux impulsions de pompage et sont propagées à travers le guide d'onde (5) où elles interagissent en dépendance spatiale. Les impulsions de pompage amplifient de manière sélective les composantes de fréquence des impulsions du signal qui se déplacent à la même vitesse que les impulsions de pompage. Les impulsions de signal amplifiées sont ensuite isolées par filtrage (6). Le signal optique régénéré (8) subit non seulement une amplification, une temporisation et une conformation renouvelées, mais également un accord renouvelé.
PCT/AU2002/001018 2001-07-31 2002-07-31 Regeneration de signal optique WO2003013032A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AUPR6737A AUPR673701A0 (en) 2001-07-31 2001-07-31 Optical signal regeneration
AUPR6737 2001-07-31

Publications (1)

Publication Number Publication Date
WO2003013032A1 true WO2003013032A1 (fr) 2003-02-13

Family

ID=3830693

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/AU2002/001018 WO2003013032A1 (fr) 2001-07-31 2002-07-31 Regeneration de signal optique

Country Status (2)

Country Link
AU (1) AUPR673701A0 (fr)
WO (1) WO2003013032A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015162416A1 (fr) * 2014-04-23 2015-10-29 Aston University Procédé de régénération de signal tout-optique

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5754325A (en) * 1995-03-31 1998-05-19 Nec Corporation Optical regenerating circuit
US5798852A (en) * 1995-06-13 1998-08-25 France Telecom All-optical device for regenerating an optical signal modulated in an RZ format
EP0901245A1 (fr) * 1997-08-27 1999-03-10 Interuniversitair Micro-Elektronica Centrum Vzw Circuit optique de décision et son utilisation
US6141129A (en) * 1997-12-18 2000-10-31 Lucent Technologies Inc. Method and apparatus for all-optical data regeneration
US20020080453A1 (en) * 2000-12-22 2002-06-27 Juerg Leuthold 3R optical signal regeneration
US20020079486A1 (en) * 2000-10-06 2002-06-27 Jithamithra Sarathy Bit-rate and format insensitive all-optical circuit for reshaping, regeneration and retiming of optical pulse streams

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5754325A (en) * 1995-03-31 1998-05-19 Nec Corporation Optical regenerating circuit
US5798852A (en) * 1995-06-13 1998-08-25 France Telecom All-optical device for regenerating an optical signal modulated in an RZ format
EP0901245A1 (fr) * 1997-08-27 1999-03-10 Interuniversitair Micro-Elektronica Centrum Vzw Circuit optique de décision et son utilisation
US6141129A (en) * 1997-12-18 2000-10-31 Lucent Technologies Inc. Method and apparatus for all-optical data regeneration
US20020079486A1 (en) * 2000-10-06 2002-06-27 Jithamithra Sarathy Bit-rate and format insensitive all-optical circuit for reshaping, regeneration and retiming of optical pulse streams
US20020080453A1 (en) * 2000-12-22 2002-06-27 Juerg Leuthold 3R optical signal regeneration

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
COLLECUTT G.R. ET AL.: "Parametric signal regeneration", OPTICS COMMUNICATIONS, vol. 198, 2001, pages 439 - 445 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015162416A1 (fr) * 2014-04-23 2015-10-29 Aston University Procédé de régénération de signal tout-optique

Also Published As

Publication number Publication date
AUPR673701A0 (en) 2001-08-23

Similar Documents

Publication Publication Date Title
AU639177B2 (en) Polarization multiplexing with solitons
EP1378789B1 (fr) Procédé et dispositif pour la génération d'un signal optique à spectre élargi
US5625479A (en) Soliton optical communication system and optical transmitter and optical receiver therefor
CA2190970C (fr) Traitement optique de paquets
KR101052957B1 (ko) 광 스위치 및 광 스위치를 이용한 광 파형 모니터 장치
US5757529A (en) In-line regenerating apparatus for regenerating a soliton-conveyed signal by synchronously modulating the solitons by means of a non-linear optical loop mirror
EP2426553A1 (fr) Dispositif de traitement de signaux optiques
US6229633B1 (en) Optical sampling by modulating a pulse train
WO2003104886A1 (fr) Systeme et procede de regeneration optique par multiplexage optique
US6337755B1 (en) Polarization independent all-optical regenerators
US5760948A (en) Method of regenerating a soliton signal using an all optical doubler
US6148122A (en) High speed lithium niobate polarization independent modulators
JP4495415B2 (ja) Ｏｔｄｍ伝送方法及び装置
Alic et al. Two-pump parametric optical delays
US6842565B2 (en) Optical modulation/multiplexing circuit
WO2003013032A1 (fr) Regeneration de signal optique
JPH1172757A (ja) 光パルス多重装置
Bergman et al. Advances in multichannel multiGbytes/s bit-parallel WDM single fiber link
JP4712991B2 (ja) 強度変調とクロストカー効果による位相変調とによる同期光再生器
JP4840827B2 (ja) 光非線形効果を利用した双方向伝播型光信号再生器および光信号再生方法
JPH06265945A (ja) 光中継装置
EP0849622A2 (fr) Echantillonage tout optique par modulation d'un train d'impulsions
US20200403712A1 (en) Optical mitigation of inter-channel crosstalk for wdm channels
JP3697512B2 (ja) 光分散等化方法及び光分散等化器
AU4103899A (en) Regenerator for in-line regeneration of an optical soliton signal by synchronous modulation of the solitons and transmission system including it

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): AE AG AL AM AT AU AZ BA BB BG BR BY BZ CA CH CN CO CR CU CZ DE DK DM DZ EC EE ES FI GB GD GE GH GM HR HU ID IL IN IS JP KE KG KP KR KZ LC LK LR LS LT LU LV MA MD MG MK MN MW MX MZ NO NZ OM PH PL PT RO RU SD SE SG SI SK SL TJ TM TN TR TT TZ UA UG US UZ VN YU ZA ZM ZW

Kind code of ref document: A1

Designated state(s): AE AG AL AM AT AU AZ BA BB BG BY BZ CA CH CN CO CR CU CZ DE DM DZ EC EE ES FI GB GD GE GH HR HU ID IL IN IS JP KE KG KP KR LC LK LR LS LT LU LV MA MD MG MN MW MX MZ NO NZ OM PH PL PT RU SD SE SG SI SK SL TJ TM TN TR TZ UA UG US UZ VN YU ZA ZM

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): GH GM KE LS MW MZ SD SL SZ TZ UG ZM ZW AM AZ BY KG KZ MD RU TJ TM AT BE BG CH CY CZ DE DK EE ES FI FR GB GR IE IT LU MC NL PT SE SK TR BF BJ CF CG CI CM GA GN GQ GW ML MR NE SN TD TG

Kind code of ref document: A1

Designated state(s): GH GM KE LS MW MZ SD SL SZ UG ZM ZW AM AZ BY KG KZ RU TJ TM AT BE BG CH CY CZ DK EE ES FI FR GB GR IE IT LU MC PT SE SK TR BF BJ CF CG CI GA GN GQ GW ML MR NE SN TD TG

121 Ep: the epo has been informed by wipo that ep was designated in this application
REG Reference to national code

Ref country code: DE

Ref legal event code: 8642

122 Ep: pct application non-entry in european phase
NENP Non-entry into the national phase

Ref country code: JP

WWW Wipo information: withdrawn in national office

Country of ref document: JP