WO2011039442A1 - Modulateur avec marquage de polarisation - Google Patents
Modulateur avec marquage de polarisation Download PDFInfo
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- WO2011039442A1 WO2011039442A1 PCT/FR2010/051914 FR2010051914W WO2011039442A1 WO 2011039442 A1 WO2011039442 A1 WO 2011039442A1 FR 2010051914 W FR2010051914 W FR 2010051914W WO 2011039442 A1 WO2011039442 A1 WO 2011039442A1
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- signal
- optical
- electrical signal
- phase
- modulator
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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
- H04B10/60—Receivers
- H04B10/61—Coherent receivers
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- 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
- H04B10/50—Transmitters
- H04B10/516—Details of coding or modulation
- H04B10/548—Phase or frequency modulation
- H04B10/556—Digital modulation, e.g. differential phase shift keying [DPSK] or frequency shift keying [FSK]
- H04B10/5561—Digital phase modulation
-
- 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
- H04B10/60—Receivers
-
- 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
- H04B10/60—Receivers
- H04B10/61—Coherent receivers
- H04B10/616—Details of the electronic signal processing in coherent optical receivers
- H04B10/6166—Polarisation demultiplexing, tracking or alignment of orthogonal polarisation components
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/002—Coherencemultiplexing
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/06—Polarisation multiplex systems
-
- 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
- H04B10/25—Arrangements specific to fibre transmission
- H04B10/2575—Radio-over-fibre, e.g. radio frequency signal modulated onto an optical carrier
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B2201/00—Indexing scheme relating to details of transmission systems not covered by a single group of H04B3/00 - H04B13/00
- H04B2201/69—Orthogonal indexing scheme relating to spread spectrum techniques in general
- H04B2201/707—Orthogonal indexing scheme relating to spread spectrum techniques in general relating to direct sequence modulation
- H04B2201/70727—Orthogonal indexing scheme relating to spread spectrum techniques in general relating to direct sequence modulation using fast Fourier transform
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B2210/00—Indexing scheme relating to optical transmission systems
- H04B2210/07—Monitoring an optical transmission system using a supervisory signal
- H04B2210/074—Monitoring an optical transmission system using a supervisory signal using a superposed, over-modulated signal
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B2210/00—Indexing scheme relating to optical transmission systems
- H04B2210/07—Monitoring an optical transmission system using a supervisory signal
- H04B2210/075—Monitoring an optical transmission system using a supervisory signal using a pilot tone
Definitions
- the invention relates to an optical communications system at one end of which polarization multiplexed optical signals are transmitted to carry data. More particularly, certain embodiments of the invention relate to systems in which data is coded by phase modulation and which uses coherent detection.
- the invention can be applied when the optical medium consists of a fiber bond, although other optical propagation media can be considered. It can also be used in single-wavelength transmission networks or multi-wavelength networks, such as Wavelength Division Multiplexing (WDM) networks.
- WDM Wavelength Division Multiplexing
- Coherent optical detection chains are known for detecting polarized multiplexed signals after their propagation in an optical medium.
- a coherent receiver is described in "Digital filters for coherent optical receivers" by Seb. J Savory (Optics Express, January 21, 2008, Vol 1, No. 2, pages 804 to 817).
- the receiver comprises an optical stage followed by an electronic stage.
- the optical stage receives the multiplexed signal in polarization after it has passed through an optical medium, often birefringent, for example an optical fiber.
- the optical stage comprises in particular an optical polarization splitter and a mixer for mixing polarization components of the received signal with the corresponding polarization components of a local oscillator signal; this optical stage of the receiver is sometimes called 90 ° optical hybrid in English.
- Four analog electrical signals are obtained at the output of the optical stage and delivered to the electronic stage of the coherent receiver.
- the coherent receiver delivers two electrical signals E, and E 2 which carry the data initially carried by the two optical signals and 0 2 polarized multiplexed and injected into the optical medium.
- a difficulty of the coherent detection is knowing how to associate without inversion the two detected electrical signals E 1 and E 2 to the two optical signals injected into the optical link, and 0 2 .
- the invention provides an optical signal modulator having a first modulator input port for receiving a first optical signal having a first optical polarization state at a wavelength, and a second modulator input port. for receiving a second optical signal having a second optical polarization state at said wavelength, said first optical polarization state being substantially orthogonal to said second optical polarization state, a first data modulator for phase modulating said first optical signal with a first data signal thereby providing a third optical signal at said wavelength, a second data modulator for phase modulating said second optical signal with a second data signal thereby providing a fourth optical signal at said wavelength, and a combiner for producing a fifth optical signal at said wavelength on a combiner output port of said combiner, said fifth optical signal being a combination of said third optical signal received on a first combiner input port of said combiner and said fourth optical signal received on a second combiner input port of said combiner, characterized in that it comprises a source of phase overmodulation for producing a phase overmodulation signal for over-modulating the
- the modulator further comprises a phase overmodulator inserted between said first modulator input port and said first combiner input port or between said second modulator input port and said second combiner input port.
- the modulator is such that said source of phase overmodulation is connected to at least one port of said first data modulator or said second data modulator or phase overdrive.
- the modulator further comprises a polarization splitter adapted to receive a sixth optical signal at said wavelength and to produce said first optical signal and said second optical signal from said sixth optical signal.
- a polarization splitter adapted to receive a sixth optical signal at said wavelength and to produce said first optical signal and said second optical signal from said sixth optical signal.
- the modulator is such that said first polarization state and second polarization state are substantially rectilinear optical polarization states.
- the modulator is such that said first data modulator and said second data modulator are capable of producing QPSK modulations.
- the modulator is such that at least one of said first data modulator, second data modulator and phase overdrive is a LiNb0 3 type modulator.
- the invention also provides a method for generating an optical signal comprising the steps of:
- phase overmodulation to one of said first optical signal, second optical signal, third optical signal and fourth optical signal, said phase overmodulation having a modulation frequency substantially lower than the modulation frequency of said first data signal and second data signal.
- the method is such that said third optical signal and said fourth optical signal are QPSK type signals.
- said third optical signal and said fourth optical signal are QPSK type signals.
- other phase modulation formats are possible, for example BPSK.
- the invention also provides a coherent receiver capable of receiving a PM-QPSK optical signal comprising
- a polarization separation stage adapted to produce a first electrical signal and a second electrical signal representing respectively a first polarization component and a second polarization component of said PM-QPSK signal
- first carrier recovery stage for receiving said first electrical signal
- second carrier recovery stage for receiving said second electrical signal
- phase analyzer capable of extracting a first phase spectrum information from said first electrical signal and a second phase spectrum information from said second electrical signal, and comparing said first phase spectrum information and said second spectrum information; phase.
- the coherent receiver is such that said phase analyzer comprises a first computer for calculating a Fourier transform of said first electrical signal and a second computer for calculating a Fourier transform of said second electrical signal.
- the coherent receiver comprises an optical stage and an electronic stage,
- said optical stage being able to produce from said PM-QPSK type optical signal a third electrical signal, a fourth electrical signal, a fifth electrical signal and a sixth electrical signal,
- said electronic stage (1 1 7) having a resynchronization and normalization stage capable of producing by resynchronization and normalization of said third electrical signal, fourth electrical signal, fifth electrical signal and sixth electrical sign, respectively seventh electrical sign, eighth electrical signal, ninth electrical signal and tenth electrical signal,
- a first stage of reconstruction of a complex signal which can produce by an operation of combination of said seventh electric signal and eighth electric signal an eleventh electric signal
- the coherent receiver is such that said polarization demultiplexer uses a constant-modulus algorithm algorithm.
- Figure 1 is a schematic representation of a coherent optical communication system using polarization multiplexing, and in which embodiments of the invention may be implemented.
- FIG. 2 represents a modulator with polarization marking according to one embodiment of the invention.
- FIG. 3 represents certain elements of the electronic stage of a coherent receiver, according to one possible embodiment of the invention.
- FIG. 4 represents phase signals obtained by numerical simulation and illustrating the benefit of the feasible polarization marking according to one embodiment of the invention.
- FIG. 1 diagrammatically shows an optical communication system using polarization multiplexing.
- a constant-power optical source 110 transmits an optical signal 102 at a wavelength.
- the polarization separator 103 separates the optical signal 102 into two optical signals 104 and 105 on the same wavelength.
- the signals 104 and 105 have substantially perpendicular polarizations.
- the two optical signals 104 and 105 are received on two input ports of the polarization marking modulator 106 which outputs at its output a signal 107 at the same wavelength.
- the signal 1 07 consists of the superposition of two substantially perpendicular polarization signals, each of these two signals carrying data or bit streams. The mode of obtaining the optical signal 107 from the optical signals 104 and 105 will be described more precisely in the following with reference to FIG. 2.
- the optical signal 107 is injected into an optical propagation medium 11. 0, for example on an optical fiber.
- An optical signal 1 1 1 at the same wavelength is obtained at the output of the optical medium 1 1 0.
- the optical signal 1 1 1 could possibly be carried by another wavelength than the signal 1 07 if the optical medium 1 1 0 comprises means for converting the wavelength. Because of the propagation in the medium 1 1 0 which may have a variable birefringence over time, the optical signal 1 1 1 has a state of polarization which is not generally identical to that of the signal 1 07.
- the signal 1 1 1 is received at the input of a coherent optical receiver consisting of an optical stage 1 1 2 and an electronic stage 1 1 7.
- the optical stage 1 1 2 delivers four analog electrical signals 1 1 3, 1 14, 1 1 5 and 1 1 6 to the electronic stage 1 1 7 whose function is to transform these four analog signals into two digital signals 1 1 8 and 1 1 9.
- the coherent optical receiver consisting of stages 1 1 2 and 1 1 7 is designed so that the digital electrical signals 1 1 8 and 1 1 9 faithfully represent the data, or bit streams, carried by the two optical signals of perpendicular optical polarizations forming the multiplexed signal 1 07.
- the optical medium 1 1 0 can be more precisely, without this example given by way of illustration can be considered as a limitation of the invention, a fiber optic link point to point consisting of different optical elements connected to each other and not shown: these elements may be for example lengths of fibers between which are inserted optical signal amplification modules, chromatic dispersion compensation modules and other elements.
- these elements may be for example lengths of fibers between which are inserted optical signal amplification modules, chromatic dispersion compensation modules and other elements.
- the nature and the number of elements constituting the optical medium 1 1 0 are not limited.
- the optical medium 1 1 0 might not implement an optical fiber, for example in the case of optical propagation unguided in the air, such as that used. for example for fiber-free optical communications access or in birefringent optical media analysis experiments, and other applications.
- FIG. 2 diagrammatically shows at FIG. 1 a modulator with polarization marking according to one possible embodiment of the invention.
- the modulator 106 consists of the digits 201 and 202 of two modulators for data coding in QPSK (Quadrature Pase-Shift Keying) format.
- the modulators 201 and 202 receive the optical signals 104 and 105 of substantially perpendicular optical polarizations.
- the modulators 201 and 202 make it possible to phase modulate the optical signals 104 and 105 respectively, thus delivering two optical signals modulated in the QPSK format, at the numbers 21 7 and 21 8.
- the signals 21 7 and 21 8 carry data or flows binaries.
- the Modulator 1 06 also includes an optional phase overmodulator at the number 203, for over-modulating the optical signal 21 7 and transforming it into an optical signal 21 9.
- the role of the over-modulator 203 will be explained in the following.
- the signals 21 9 (or the signal 21 7 in the absence of the over-modulator 203, since this modulator is optional, as indicated above) and the signal 21 8 are combined by a polarization combiner prism at the number 220 to provide the signal 1 07 consists of the superposition of the two signals 21 9 (or 21 7 in the absence of over-modulator 203) and 21 8.
- the modulator 201 comprises two Mach-Zehnder interferometers 204 and 205. It consists of a 1: 2 input coupler at the number 1 1 to receive the optical signal 104 and a 2: 1 output coupler at the digit 1 2 to deliver the optical signal 21 7, these two couplers being connected by two arms.
- the upper arm in FIG. 2 comprises a Mach-Zehnder interference at the number 204.
- the lower arm of the modulator 201 carries another Mach-Zehnder interferometer at the number 205 in series with a phase shifter of ⁇ / 2 at the number 206.
- FIG. 21 1 shows an electrode for receiving a data signal 13 for modulating the phase of an optical signal passing through the modulator 204 in steps of ⁇ .
- FIG. 21 shows an electrode for receiving a data signal. 14 to modulate the phase of an optical signal passing through the modulator 204 in steps of ⁇ .
- FIG. 21 represents an electrode for receiving a signal for phase shifting the optical signal transmitted by the modulator 205 by ⁇ / 2.
- the signal 21 7 is obtained by combining a first optical signal obtained at the output of the modulator 204 and a second optical signal obtained at the output of the phase shifter 206, this combination being achieved by the 2: 1 coupler at the number 1 2, in output of the modulator 201.
- the modulator 201 thus produced constitutes itself a Mach-Zehnder interferometer.
- the modulator 202 is constituted in the same way.
- the Mach-Zehnder interferometers 204, 206, 207 and 208 could alternatively use each several electrodes, for example one on each of the two arms forming each of these interferometers, to apply modulation signals. according to a push-pull montage in English.
- the modulators 204, 205, 207 and 208 as well as the phase shifters 206 and 209 could each use a number of electrodes different from that shown in FIG. 2, on which only one electrode has been indicated for each of them, for the sake of brevity.
- the signal 21 7 is therefore a signal in QPSK format whose optical polarization is substantially close to that of the signal 104, a difference between these polarization states may come from the birefringence of the modulator 201.
- the signal 21 8 is a signal in QPSK format whose optical polarization is substantially close to that of the signal 105, a difference between these polarization states can come from the birefringence of the modulator 202.
- the polarization combiner prism 220 delivers the optical signal consisting of the superposition of two optical signals, on two substantially perpendicular polarizations (as are the polarizations of the signals 1 04 and 1 05), each of the signals carrying data coded in QPSK format.
- the signal 107 is therefore a signal in PM-QPSK format for Polarization Multiplexed Quadrature Pase-Shift Keying in English.
- the signal 1 1 1 transmitted by the optical medium 1 1 0 can also be described as a PM-QPSK signal.
- a low frequency signal source 221 applies an overmodulation signal to the electrode 21 0 of the modulator 203.
- an overmodulation of the phase may be present on the signal 21 9.
- One of the two polarization components constituting the signal 1 07, more precisely the signal 21 9, is therefore a signal in QPSK format, presenting moreover an overmodulation of the phase, induced by the modulator 203.
- An electrode of the over-modulator 203 for displaying a modulation signal to obtain the optical signal 219 by over-modulation of the phase of the signal 21 is shown at 211.
- the over-modulator 203 is optional.
- the over-modulator 203 could alternatively comprise several electrodes and not the only electrode 21 0.
- the over-modulator 203 could also be inserted at different locations of the modulator 106, according to arrangements not shown. It could thus be placed between the separator 1 03 and the modulator 201. It could alternatively be placed on the upper arm of the Mach-Zehnder interferometer constituting the modulator 201, upstream or downstream of the modulator 204. It could also be placed on the lower arm of the Mach-Zehnder interferometer constituting the modulator 201, for example in upstream of the modulator 205, or downstream of the phase shifter 21 3 or between these two elements.
- the over-modulator 203 is absent, so as to reduce the cost of producing the modulator 1 06.
- the over-modulation signal delivered by the source 221 may for example be applied to one of the electrodes of the modulator 204.
- the over-modulation signal may more generally be applied to at least one of the electrodes of an element of the upper arm of the modulator 206.
- a marking of the polarization by over-modulation of the phase may be present on the signal 1 1 7 by applying the over-modulation signal delivered by the over-modulation source 221 to at least one of the electrodes of the modulator 204 or of the modulator 205 or of the phase-shifter 206.
- the polarization marking by an over-modulation of the phase may be present on the signal 21 8 by applying the over-modulation signal delivered by the over-modulation source 221 to at least one of the electrodes of the modulators 207 or 20 8 or the phase-shifter 209.
- One of the signals constituting the signal 107 that is to say, the signal 21 7 or the signal 21 8, is a QPSK-format signal, furthermore having an over-modulation of the phase for marking the polarization.
- This over-modulation can advantageously be an over-modulation whose modulation frequency is substantially lower than the frequency of modulation of data in QPSK format.
- the over-modulation of the phase of one of the two polarization components of the transmitted optical signal will make it possible to distinguish during the demultiplexing of the signals and the obtaining of the signals.
- 1 1 8 and 1 1 9 ( Figure 1) which of these two signals corresponds to the QPSK format data carried by the signals 21 7 and 21 8.
- a frequency overmodulation significantly lower than the data modulation frequency format QPSK must be understood as a frequency that is easy to separate by electrical filtering means at the level of the electrical stage 1 1 7 ( Figure 1).
- FIG. 3 diagrammatically shows the electronic stage of a coherent receiver making it possible to decode the signal 107 from the reception of the signal 11 (FIG. 1).
- the electronic stage shown in FIG. 3 certain elements are already known and as for example described in "Digital filters for coherent optical receivers" by Seb. J Savory (Optics Express, January 21, 2008, Vol 1, No. 2, pages 804 to 817).
- a 301 resynchronization and normalization stage transforms the analog electrical signals to the numbers 1 1 3, 1 14, 1 1 5 and 1 1 6 provided by the optical stage 1 1 2 (FIG. 1) into four resynchronized digital signals and 306, 303, 304 and 305.
- a stage 306 for the reconstruction of a complex signal makes it possible to obtain the electrical signal 308 by a combination of the signals 302 and 303.
- a stage 307 for the reconstruction of a signal a complex signal makes it possible to obtain the electrical signal 309 by a combination of the signals 304 and 305.
- An electronic compensation stage for the chromatic dispersion at the digit 31 0 makes it possible to obtain an electric signal 31 2 from the signal 308. Even an electronic stage of compensation of the chromatic dispersion at the number 31 1 makes it possible to obtain an electric signal 31 3 from the signal 309.
- a carrier recovery stage 31 8 delivers an electrical signal 320 from the signal 31 5 and a carrier recovery stage 319 delivers an electrical signal 320 from the signal 31 5.
- Two decision stages 322 and 323 (in English, "symbol estimation”) deliver from the signals 320 and 321 respectively the electrical signals 1 1 8 and 1 1 9.
- One of the two electrical signals 1 1 8 and 1 1 9 carries the data applied by the modulator 201 ( Figure 2) on a first polarization component of the transmitted signal, namely the data of the signals 1 3 and 1 4. To find out which one is looking for which one bears the trace of the phase overmodulation.
- FIG. 3 further discloses a phase analyzer 324 capable of extracting and comparing phase information of the signal 31 present at the carrier recovery stage 318 and phase information of the signal 31 6 present at the 9.
- a phase analyzer 324 capable of extracting and comparing phase information of the signal 31 present at the carrier recovery stage 318 and phase information of the signal 31 6 present at the 9.
- the marking by over-modulation of the phase of one of the two polarization components constituting the signal 107 is detectable at the level of the stage.
- carrier recovery 31 8 or 31 9 corresponding to that two polarization components of the signal 1 07 ( Figure 2) which carries the phase overmodulation.
- FIG. 4-b shows, from numerical simulations (arbitrary units), phase information contained in that of the signals 31 5 and 31 6 corresponds to the polarization component of the signal 107 bearing the marking by over-modulation of the signal. phase.
- FIG. 4a shows phase information contained in that of the signals 31 5 and 31 6 which corresponds to the polarization component of the signal 107 which does not bear the marking by over-modulation of the phase. If a digital Fourier transform is applied to the information provided in FIGS. 4-a and 4-b, the phase spectra at FIGS. 21 and 22 in FIGS. 4-c and 4-d are respectively obtained. The spectrum of Figure 4-d clearly shows in the low frequencies a signal that differentiates it from the spectrum of Figure 4-c.
- This signal corresponds to the overmodulation at a frequency substantially lower than the frequency of the QPSK data, as indicated above.
- This signal for marking the phase makes it possible to know which of the signals 320 and 321 (FIG. 3) and consequently of the signals 111 and 115 (FIGS. 1 and 3) correspond to the data or bit streams carried by the signal.
- optics 21 7 Figure 2).
- the spectrum which does not show the low frequency over-modulation allows to identify, among the signals 1 1 8 and 1 1 9, that which corresponds to the data carried by the optical signal 21 8.
- FIG. 324 represents a phase analyzer whose function is to calculate and compare the phase information present in the set 31 consisting of the carrier recovery stages. 31 8 and 31 9. This comparison is made between Fourier transforms of the phase information present in these two stages, or by other types of digital manipulation of the signals 31 5 and 31 6.
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- Optical Communication System (AREA)
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Abstract
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Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020137022844A KR20130102660A (ko) | 2009-09-30 | 2010-09-15 | 코히런트 수신기 |
CN2010800438196A CN102577185A (zh) | 2009-09-30 | 2010-09-15 | 具有偏振标记的调制器 |
JP2012531472A JP5583222B2 (ja) | 2009-09-30 | 2010-09-15 | 偏光のマーキングを用いる変調器 |
KR1020127010704A KR101392793B1 (ko) | 2009-09-30 | 2010-09-15 | 편광의 마킹을 갖는 변조기 |
US13/496,669 US9219548B2 (en) | 2009-09-30 | 2010-09-15 | Modulator with marking of polarization |
EP10770561A EP2484031A1 (fr) | 2009-09-30 | 2010-09-15 | Modulateur avec marquage de polarisation |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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FR0956793A FR2950746B1 (fr) | 2009-09-30 | 2009-09-30 | Modulateur avec marquage de polarisation |
FR0956793 | 2009-09-30 |
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WO2011039442A1 true WO2011039442A1 (fr) | 2011-04-07 |
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PCT/FR2010/051914 WO2011039442A1 (fr) | 2009-09-30 | 2010-09-15 | Modulateur avec marquage de polarisation |
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US (1) | US9219548B2 (fr) |
EP (1) | EP2484031A1 (fr) |
JP (1) | JP5583222B2 (fr) |
KR (2) | KR101392793B1 (fr) |
CN (1) | CN102577185A (fr) |
FR (1) | FR2950746B1 (fr) |
WO (1) | WO2011039442A1 (fr) |
Families Citing this family (4)
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JP5877727B2 (ja) * | 2012-02-14 | 2016-03-08 | 日本オクラロ株式会社 | 半導体光変調素子及び光モジュール |
JP6058135B2 (ja) * | 2012-08-09 | 2017-01-11 | ゼットティーイー(ユーエスエー)インコーポレーテッド | コヒーレントデュオバイナリ整形pm−qpsk信号処理方法及び装置 |
US20190113683A1 (en) * | 2016-03-31 | 2019-04-18 | Sumitomo Osaka Cement Co., Ltd | Optical modulation device |
US20210119710A1 (en) * | 2020-06-19 | 2021-04-22 | Meer Nazmus Sakib | Optical coherent receiver on a chip |
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JP5365319B2 (ja) * | 2009-04-10 | 2013-12-11 | 富士通株式会社 | 光伝送システム |
JP5407595B2 (ja) * | 2009-06-30 | 2014-02-05 | 富士通株式会社 | 信号処理回路、光受信装置、検出装置および波形歪補償方法 |
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2009
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2010
- 2010-09-15 JP JP2012531472A patent/JP5583222B2/ja not_active Expired - Fee Related
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- 2010-09-15 US US13/496,669 patent/US9219548B2/en not_active Expired - Fee Related
- 2010-09-15 WO PCT/FR2010/051914 patent/WO2011039442A1/fr active Application Filing
- 2010-09-15 KR KR1020137022844A patent/KR20130102660A/ko not_active Application Discontinuation
- 2010-09-15 CN CN2010800438196A patent/CN102577185A/zh active Pending
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Also Published As
Publication number | Publication date |
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CN102577185A (zh) | 2012-07-11 |
KR20130102660A (ko) | 2013-09-17 |
JP5583222B2 (ja) | 2014-09-03 |
KR20120073296A (ko) | 2012-07-04 |
JP2013506864A (ja) | 2013-02-28 |
US20120189307A1 (en) | 2012-07-26 |
EP2484031A1 (fr) | 2012-08-08 |
US9219548B2 (en) | 2015-12-22 |
FR2950746B1 (fr) | 2013-09-06 |
KR101392793B1 (ko) | 2014-05-09 |
FR2950746A1 (fr) | 2011-04-01 |
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