WO2014020804A1 - 偏波多重光送信機及び動作制御方法 - Google Patents
偏波多重光送信機及び動作制御方法 Download PDFInfo
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- WO2014020804A1 WO2014020804A1 PCT/JP2013/002937 JP2013002937W WO2014020804A1 WO 2014020804 A1 WO2014020804 A1 WO 2014020804A1 JP 2013002937 W JP2013002937 W JP 2013002937W WO 2014020804 A1 WO2014020804 A1 WO 2014020804A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/06—Polarisation multiplex systems
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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
- H04B10/25—Arrangements specific to fibre transmission
- H04B10/2507—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion
- H04B10/2543—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion due to fibre non-linearities, e.g. Kerr effect
- H04B10/255—Self-phase modulation [SPM]
-
- 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
- H04B10/2507—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion
- H04B10/2543—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion due to fibre non-linearities, e.g. Kerr effect
- H04B10/2557—Cross-phase modulation [XPM]
-
- 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
- H04B10/501—Structural aspects
- H04B10/503—Laser transmitters
- H04B10/505—Laser transmitters using external modulation
- H04B10/5053—Laser transmitters using external modulation using a parallel, i.e. shunt, combination of modulators
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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
- H04B10/532—Polarisation modulation
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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
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/04—Mode multiplex systems
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/18—Phase-modulated carrier systems, i.e. using phase-shift keying
- H04L27/20—Modulator circuits; Transmitter circuits
- H04L27/2096—Arrangements for directly or externally modulating an optical carrier
Definitions
- the present invention relates to a polarization multiplexed optical transmitter and an operation control method, and more particularly to a polarization multiplexed optical transmitter that synthesizes and transmits two optical signals having the same wavelength in a polarization state orthogonal to each other.
- the transmission capacity per fiber can be doubled by using a polarization multiplexing method that transmits signals using light that is orthogonally polarized. Recently, it has become possible to efficiently separate polarization multiplexed signals by introducing digital signal processing technology into the receiver of an optical transceiver, and polarization multiplexing has been widely used. .
- a polarization multiplexed signal is affected by a non-linear effect (cross-polarization cross-phase modulation: inter-polarization XPM) from orthogonal polarization signals.
- inter-polarization XPM cross-polarization cross-phase modulation
- polarization multiplexed signals at the same wavelength not only propagate through the optical fiber at the same speed, but also produce similar waveform changes when subjected to chromatic dispersion, so the effects of inter-polarization XPM accumulate.
- signal quality is greatly degraded depending on the transmission distance. Therefore, in order to transmit a polarization multiplexed signal with a good transmission quality over a long distance, a technique for compensating and mitigating waveform distortion generated during transmission is important.
- Patent Document 1 in a transmitter of an optical signal transmission system using a polarization multiplexing system, an asymmetric chirp is added to two optical signals (polarized wave components), thereby phase-separating the two optical signals. It describes that after modulation, they are combined in a polarization state orthogonal to each other to generate a polarization multiplexed signal.
- Patent Document 1 can alleviate the influence of XPM between polarized waves, so that the signal quality can be improved.
- XPM self-phase modulation
- chromatic dispersion which is one of the nonlinear optical effects in an optical fiber. It is also important.
- An object of the present invention is to provide a polarization multiplexed optical transmitter and an operation control method capable of solving the above-described problems and further improving signal quality.
- a polarization multiplexed optical transmitter includes a frequency dividing unit that divides a clock signal having a baud rate frequency, a phase modulation unit that phase-modulates an optical signal using the divided clock signal, and the phase A branching means for branching the modulated optical signal into two; a delaying means for delaying one of the two branched optical signals with respect to the other to generate optical signals whose phases are inverted; and the generated optical signal And polarization multiplexing means for generating a polarization multiplexed signal by combining the signals in the orthogonal polarization state.
- a polarization multiplexing optical transmitter divides a clock signal having a baud rate frequency and phase-modulates two optical signals having the same wavelength by using the divided clock signal. And phase modulation and delay means for delaying one optical signal with respect to the other to generate optical signals whose phases are inverted with each other, and combining the generated optical signals with polarization states orthogonal to each other and polarization multiplexing Polarization multiplexing means for generating a signal.
- An operation control method is an operation control method for a polarization multiplexed optical transmitter, wherein a frequency dividing step of dividing a clock signal having a baud rate frequency and an optical signal using the divided clock signal are provided.
- a polarization multiplexing step for combining the generated optical signals in polarization states orthogonal to each other to generate a polarization multiplexed signal.
- An operation control method is an operation control method for a polarization multiplexed optical transmitter, wherein a frequency dividing step of dividing a clock signal having a frequency of a baud rate and a wavelength using the divided clock signal are performed. Phase modulation and delay step for phase-modulating the same two optical signals and delaying one optical signal with respect to the other to generate inverted optical signals, and the generated optical signals orthogonal to each other And a polarization multiplexing step for generating a polarization multiplexed signal by combining in a polarization state.
- FIG. 2 is a diagram for explaining a modulation state transition in a generation process of a polarization multiplexed optical signal in the configuration of FIG. 1.
- FIG. 2 is a diagram for explaining a modulation state transition in a generation process of a polarization multiplexed optical signal in the configuration of FIG. 1.
- FIG. 2 is a diagram for explaining a modulation state transition in a generation process of a polarization multiplexed optical signal in the configuration of FIG. 1.
- FIG. 1 It is a figure which shows the structure of the polarization multiplexing optical transmitter by the 2nd Embodiment of this invention. It is a figure for demonstrating the transition of a modulation state in the production
- FIG. 1 is a diagram showing the configuration of a polarization multiplexed optical transmitter according to the first embodiment of the present invention.
- the polarization multiplexed optical transmitter according to the first embodiment of the present invention includes a laser diode (LD) 1 as a signal source, and a frequency dividing circuit 21 for halving the frequency of the clock signal 9.
- the phase modulator 8 that performs phase modulation using the clock signal divided by the frequency dividing circuit 21, the optical coupler 2 for branching the optical signal, and one of the lights branched by the optical coupler 2 are delayed.
- a delay circuit 10 PSK (Phase Shift Keying) modulators 3 and 4 for performing data modulation on the light branched by the optical coupler 2, and a polarization beam combiner 5 for multiplexing the light after PSK modulation in an orthogonal polarization state Including.
- the light output from the LD 1 is phase-modulated by the optical phase modulator 8 driven by the clock signal divided by the frequency dividing circuit 21.
- the frequency of the clock signal 9 is the same as that of the data modulation (Baud rate), and the clock signal 9 is frequency-divided by 1/2 by the frequency divider circuit 21 and output to the optical phase modulator 8.
- the phase-modulated light is branched into two by the optical coupler 2, and data modulation is performed on one of them using the data signal 6 by the PSK modulator 3.
- the other light is delayed by the delay circuit 10 for one Baud rate period (one period of the clock signal 9), and then data modulation is performed by the PSK modulator 4 using the data signal 7. .
- the delay circuit 10 gives a delay is to invert the phases of the two phase-modulated lights that are the outputs of the optical coupler 2. Therefore, the delay amount of the delay circuit 10 is set to one cycle of Baud rate (one cycle of the clock signal 9).
- the output lights of the PSK modulators 3 and 4 are polarization multiplexed into orthogonal polarization states by the polarization beam combiner 5 to generate a polarization multiplexed optical modulation signal.
- the X-polarized and Y-polarized optical signals are PSK modulated signals that have undergone different data modulations corresponding to the data signals 6 and 7, respectively. However, as shown in the state E of FIG. 4 and FIG. When the phase change curves of the light are compared, the phase curves are inverted between the X polarization and the Y polarization.
- FIG. 5 is a diagram showing an example of the optical output of the polarization multiplexed optical transmitter of FIG.
- phase modulation with different polarities is superimposed between the X polarization and the Y polarization (the polarity here is the phase modulation waveform (phase curve) on the top). Meaning that it is convex or convex downward), that is, the polarity is inverted between the X polarization and the Y polarization.
- the polarity of the phase is further inverted between adjacent bits in the same polarization (the unevenness is alternated for each bit). To appear).
- this polarization multiplexed signal undergoes different waveform changes (dispersion or compression) when subjected to chromatic dispersion in the transmission line fiber. ).
- the signal (bit) on which phase modulation of one polarity is superimposed receives the dispersion of the time waveform (spreads the time waveform), whereas the signal of the other polarity In the signal (bit) on which the phase modulation is superimposed, the time waveform is compressed (pulse compression).
- FIG. 6 is a diagram showing a configuration of a polarization multiplexing optical transmitter according to the second embodiment of the present invention, and the same parts as those in FIG. 1 are denoted by the same reference numerals.
- the polarization multiplexed optical transmitter according to the second embodiment of the present invention does not include the frequency dividing circuit 21 of FIG. 1, and is phase-modulated by the optical phase modulator 8 at the same frequency as the Baud rate.
- the delay amount of the delay circuit 10 is a half period of Baud rate (a half period of the clock signal 9).
- the X-polarized and Y-polarized optical signals are PSK modulated signals subjected to different data modulations corresponding to the data signals 6 and 7, respectively. However, as shown in the state E of FIG. 8 and FIG. When the phase change curves of the light are compared, the phase curves are inverted between the X polarization and the Y polarization.
- FIG. 9 is a diagram showing an example of the optical output of the polarization multiplexed optical transmitter of FIG.
- phase modulation with different polarities is superimposed between the X polarization and the Y polarization, that is, the polarity is inverted between the X polarization and the Y polarization.
- the phase polarity is inverted between adjacent bits in the same polarization as shown in FIG. As shown in FIG. 9, the state of unevenness appearing alternately on each other does not occur.
- FIG. 10 is a diagram showing a configuration of a polarization multiplexed optical transmitter according to the third embodiment of the present invention, and the same parts as those in FIG. 1 are denoted by the same reference numerals.
- the polarization multiplexed optical transmitter according to the third embodiment of the present invention changes the arrangement of the delay circuit with respect to the configuration of FIG. In this configuration, the delay circuit 11 is arranged.
- the delay amount of the delay circuit 11 is one cycle of Baud rate (one cycle of the clock signal 9). It goes without saying that the third embodiment of the present invention having such a configuration can also achieve the same effects as those of the first embodiment of the present invention.
- FIG. 11 is a diagram showing a configuration of a polarization multiplexed optical transmitter according to the fourth embodiment of the present invention, and the same parts as those in FIG. 1 are denoted by the same reference numerals.
- the polarization multiplexed optical transmitter according to the fourth embodiment of the present invention has a configuration in which the arrangement of the phase modulator is changed from the configuration of FIG.
- the clock signal 9 is frequency-divided into half the frequency by the frequency divider circuit 21
- the clock signal is branched into two by the clock distributor 14 and supplied to the phase modulators 12 and 13 arranged at the subsequent stage of the optical coupler 2.
- a delay circuit 15 is arranged between the clock distributor 14 and the phase modulator 13, and the delay amount of the delay circuit 15 is one cycle of Baud rate (one cycle of the clock signal 9).
- the phase modulator 12 performs phase modulation on the input light using the clock signal from the clock distributor 14, and the phase modulator 13 converts the input light using the clock signal delayed by the delay circuit 15. In contrast, phase modulation is performed.
- the fourth embodiment of the present invention having such a configuration can achieve the same effects as those of the first embodiment of the present invention.
- the PSK modulators 3 and 4 may be disposed between the optical coupler 2 and the phase modulators 12 and 13.
- FIG. 12 is a diagram showing a configuration of a polarization multiplexed optical transmitter according to the fifth embodiment of the present invention, and the same parts as those in FIG. 11 are denoted by the same reference numerals.
- the polarization multiplexed optical transmitter according to the fifth embodiment of the present invention changes the arrangement of the delay circuit with respect to the configuration of FIG. 11, and includes the phase modulator 13 and the PSK modulator 4.
- the delay circuit 10 is arranged between them.
- the delay amount of the delay circuit 10 is one cycle of Baud rate (one cycle of the clock signal 9). It goes without saying that the fifth embodiment of the present invention having such a configuration can also achieve the same effects as those of the first embodiment of the present invention.
- FIG. 13 is a diagram showing a configuration of a polarization multiplexed optical transmitter according to the sixth embodiment of the present invention, and the same parts as those in FIG. 11 are denoted by the same reference numerals.
- the polarization multiplexed optical transmitter according to the sixth embodiment of the present invention changes the arrangement of the delay circuit with respect to the configuration of FIG. In this configuration, the delay circuit 11 is arranged.
- the delay amount of the delay circuit 11 is one cycle of Baud rate (one cycle of the clock signal 9). It is needless to say that the sixth embodiment of the present invention having such a configuration can achieve the same effects as those of the first embodiment of the present invention.
- FIG. 14 is a diagram showing a configuration of a polarization multiplexed optical transmitter according to the seventh embodiment of the present invention, and the same parts as those in FIG. 1 are denoted by the same reference numerals.
- the polarization multiplexed optical transmitter according to the seventh embodiment of the present invention has a configuration in which amplitude modulation (AM modulation) by a clock signal 9 is further added to the configuration of FIG.
- a clock distributor 14 and AM modulators 16 and 17 are added.
- the clock distributor 14 supplies the clock signal 9 to the frequency dividing circuit 21 and the AM modulators 16 and 17.
- the AM modulator 16 performs amplitude modulation on the input light using the clock signal from the clock distributor 14, and the AM modulator 17 outputs the input light delayed by the delay circuit 10 from the clock distributor 14. Amplitude modulation is performed using the clock signal. It is needless to say that the seventh embodiment of the present invention having such a configuration can achieve the same effects as those of the first embodiment of the present invention.
- AM modulators 16 and 17 may be arranged between the PSK modulators 3 and 4 and the polarization beam combiner 5.
- FIG. 15 is a diagram showing a configuration of a polarization multiplexed optical transmitter according to the eighth embodiment of the present invention, and the same parts as those in FIG. 11 are denoted by the same reference numerals.
- the polarization multiplexed optical transmitter according to the eighth embodiment of the present invention has a configuration in which an AM modulator 18 is added between the LD 1 and the optical coupler 2 with respect to the configuration of FIG. is there.
- the phase modulators 12 and 13 are arranged between the PSK modulators 3 and 4 and the polarization beam combiner 5, but the optical coupler 2 and the PSK modulator are the same as in FIG. Of course, it may be arranged between 3 and 4.
- the clock distributor 22 supplies the clock signal 9 to the frequency divider circuit 21 and the AM modulator 18.
- the AM modulator 18 performs amplitude modulation on the input light using the clock signal 9 from the clock distributor 22. It goes without saying that the eighth embodiment of the present invention having such a configuration can achieve the same effects as those of the first embodiment of the present invention.
- FIG. 16 is a diagram showing a configuration of a polarization multiplexed optical transmitter according to the ninth embodiment of the present invention, and the same parts as those in FIG. 15 are denoted by the same reference numerals.
- the polarization multiplexed optical transmitter according to the ninth embodiment of the present invention changes the arrangement of the delay circuit with respect to the configuration of FIG. 15, and the PSK modulator 4, the phase modulator 13, In this configuration, the delay circuit 10 is arranged between the two. It is needless to say that the ninth embodiment of the present invention having such a configuration can achieve the same effects as those of the first embodiment of the present invention.
Abstract
Description
2 光カプラ
3,4 PSK変調器
5 偏波ビームコンバイナ
6,7 データ信号
8,12,13 位相変調器
9 クロック信号
10,11,15 遅延回路
14,22 クロック分配器
16,17,18 AM変調器
21 分周回路
Claims (10)
- ボーレートの周波数を有するクロック信号を分周する分周手段と、
前記分周されたクロック信号を用いて光信号を位相変調する位相変調手段と、
前記位相変調された光信号を2分岐する分岐手段と、
前記2分岐された光信号の一方を他方に対して遅延させて互いに位相が反転した光信号を生成する遅延手段と、
前記生成された光信号を互いに直交する偏波状態で合成して偏波多重信号を生成する偏波多重手段とを含む偏波多重光送信機。 - 前記分周手段は、前記ボーレートの周波数を有するクロック信号を1/2分周し、
前記遅延手段は、前記ボーレートの周波数を有するクロック信号の1周期分だけ前記一方の光信号を前記他方に対して遅延させる請求項1記載の偏波多重光送信機。 - ボーレートの周波数を有するクロック信号を分周する分周手段と、
前記分周されたクロック信号を用いて波長が同一の2つの光信号をそれぞれ位相変調すると共に一方の光信号を他方に対して遅延させて互いに位相が反転した光信号を生成する位相変調及び遅延手段と、
前記生成された光信号を互いに直交する偏波状態で合成して偏波多重信号を生成する偏波多重手段とを含む偏波多重光送信機。 - 前記位相変調及び遅延手段は、前記分周されたクロック信号を2分岐する分岐手段と、前記2分岐されたクロック信号の一方を他方に対して遅延させる遅延手段とを含み、前記一方のクロック信号を用いて前記一方の光信号を位相変調し、前記他方のクロック信号を用いて前記他方の光信号を位相変調することにより、前記互いに位相が反転した光信号を生成する請求項3記載の偏波多重光送信機。
- 前記分周手段は、前記ボーレートの周波数を有するクロック信号を1/2分周し、
前記位相変調及び遅延手段は、前記ボーレートの周波数を有するクロック信号の1周期分だけ前記一方の光信号を前記他方に対して遅延させる請求項3または4記載の偏波多重光送信機。 - ボーレートの周波数を有するクロック信号を分周する分周ステップと、
前記分周されたクロック信号を用いて光信号を位相変調する位相変調ステップと、
前記位相変調された光信号を2分岐する分岐ステップと、
前記2分岐された光信号の一方を他方に対して遅延させて互いに位相が反転した光信号を生成する遅延ステップと、
前記生成された光信号を互いに直交する偏波状態で合成して偏波多重信号を生成する偏波多重ステップとを含む偏波多重光送信機の動作制御方法。 - 前記分周ステップは、前記ボーレートの周波数を有するクロック信号を1/2分周し、
前記遅延ステップは、前記ボーレートの周波数を有するクロック信号の1周期分だけ前記一方の光信号を前記他方に対して遅延させる請求項6記載の動作制御方法。 - ボーレートの周波数を有するクロック信号を分周する分周ステップと、
前記分周されたクロック信号を用いて波長が同一の2つの光信号をそれぞれ位相変調すると共に一方の光信号を他方に対して遅延させて互いに位相が反転した光信号を生成する位相変調及び遅延ステップと、
前記生成された光信号を互いに直交する偏波状態で合成して偏波多重信号を生成する偏波多重ステップとを含む偏波多重光送信機の動作制御方法。 - 前記位相変調及び遅延ステップは、前記分周されたクロック信号を2分岐する分岐ステップと、前記2分岐されたクロック信号の一方を他方に対して遅延させる遅延ステップとを含み、前記一方のクロック信号を用いて前記一方の光信号を位相変調し、前記他方のクロック信号を用いて前記他方の光信号を位相変調することにより、前記互いに位相が反転した光信号を生成する請求項8記載の動作制御方法。
- 前記分周ステップは、前記ボーレートの周波数を有するクロック信号を1/2分周し、
前記位相変調及び遅延ステップは、前記ボーレートの周波数を有するクロック信号の1周期分だけ前記一方の光信号を前記他方に対して遅延させる請求項8または9記載の動作制御方法。
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US14/418,286 US9419744B2 (en) | 2012-08-01 | 2013-05-07 | Polarization multiplexing optical transmitter and operation control method |
EP13825957.7A EP2882118B1 (en) | 2012-08-01 | 2013-05-07 | Polarization multiplexing optical transmitter and method for controlling operation |
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JP7099045B2 (ja) | 2018-05-18 | 2022-07-12 | 富士通株式会社 | 波長変換装置、伝送装置、及び伝送システム |
JP7306652B2 (ja) | 2019-10-04 | 2023-07-11 | Kddi株式会社 | 光送信装置及び光通信システム |
Also Published As
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EP2882118B1 (en) | 2019-08-07 |
US9419744B2 (en) | 2016-08-16 |
US20150229433A1 (en) | 2015-08-13 |
EP2882118A4 (en) | 2016-04-13 |
EP2882118A1 (en) | 2015-06-10 |
CN104509004B (zh) | 2017-08-08 |
CN104509004A (zh) | 2015-04-08 |
JP5850159B2 (ja) | 2016-02-03 |
JPWO2014020804A1 (ja) | 2016-07-21 |
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