WO2022085075A1 - Système de transport de lumière, procédé d'amplification de lumière et programme informatique - Google Patents

Système de transport de lumière, procédé d'amplification de lumière et programme informatique Download PDF

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WO2022085075A1
WO2022085075A1 PCT/JP2020/039400 JP2020039400W WO2022085075A1 WO 2022085075 A1 WO2022085075 A1 WO 2022085075A1 JP 2020039400 W JP2020039400 W JP 2020039400W WO 2022085075 A1 WO2022085075 A1 WO 2022085075A1
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optical
signal
phase
light
amplification
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PCT/JP2020/039400
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English (en)
Japanese (ja)
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暁 川合
新平 清水
孝行 小林
拓志 風間
毅伺 梅木
裕 宮本
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日本電信電話株式会社
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Priority to JP2022556858A priority Critical patent/JPWO2022085075A1/ja
Priority to PCT/JP2020/039400 priority patent/WO2022085075A1/fr
Publication of WO2022085075A1 publication Critical patent/WO2022085075A1/fr

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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
    • 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
    • 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

Definitions

  • the present invention relates to an optical transmission system, an optical amplification method and a computer program.
  • the main cause of noise in a transmission system using an optical amplifier is noise derived from naturally emitted light (ASE: Amplified Spontaneous Emission) generated by the optical amplifier.
  • the reduction of noise contributes to the increase of OSNR of the system and the increase of communication capacity.
  • EDFA Erbium Doped Fiber Amplifier
  • PIA phase insensitive amplifier
  • PSA Phase Sensitive Amplifier
  • PPA Phase Sensitive Amplifier
  • OPA is an amplifier that performs optical amplification using a non-linear optical effect, and uses a highly non-linear fiber, which is a third-order nonlinear medium, or periodic polarization inversion lithium niobate (PPLN: Periodically), which is a second-order nonlinear medium.
  • PPLN periodic polarization inversion lithium niobate
  • the one using poled lithium niobate) has been realized so far.
  • phase-coupled light of input light called idler light is generated at the time of amplification. When this idler light is generated at the same frequency as the original input light, the above phase-sensitive amplification operation is realized.
  • the channel to be amplified is arranged at the degenerate frequency of the PSA.
  • the degenerate PSA idler light is generated by the interaction between the optical signal and the excitation light in the non-linear medium, and the amplification action is obtained by superimposing the optical signal and the generated idler light.
  • the input light is arranged at the fundamental frequency of the amplification medium (the center frequency of the phase matching condition of the nonlinear optical effect), and the idler light is generated at the same frequency in the amplification medium.
  • the degenerate PSA also has the following problems.
  • ND-PSA Non-Degenerate Phase Sensitive Amplification
  • the optical signal is arranged at a frequency different from the fundamental frequency of the amplification medium.
  • the ND-PSA has a configuration in which an optical signal is arranged at a frequency shifted from the degenerate frequency of the PSA in order to amplify a wavelength division multiplexing signal or a high multivalued signal.
  • an optical signal and an idler light having a complex amplitude coupled to the optical signal are generated at a frequency symmetric with respect to the degenerate frequency, and the transmission fiber is co-propagated. Then, a phase-sensitive amplification operation is obtained by the interaction between three light waves having different frequencies of the optical signal, the frequency of the idler light, and the frequency of the excitation light in the non-linear medium.
  • the idler light is converted into an optical signal frequency by a nonlinear optical effect, and phase-sensitive amplification is realized when the phases of the optical signal and the idler light are aligned. Therefore, in order to realize ND-PSA, it is necessary that the relative phase relationships of the three lights of the optical signal, the idler light, and the excitation light are appropriately synchronized. Since the optical signal and the idler light need to have noise components that are uncorrelated with each other, the idler light needs to be generated on the transmitting side and co-propagated with the optical signal.
  • a method called an optical phase-locked loop (PLL) or a method called injection synchronization is used.
  • PLL optical phase-locked loop
  • injection synchronization is used.
  • the generation of idler light a method of incorporating an OPA different from PSA into the transmission system to optically generate idler light is common.
  • an object of the present invention is to provide a technique capable of realizing non-degenerate phase-sensitive amplification with a simpler configuration.
  • One aspect of the present invention is a signal generation unit that generates a baseband signal used for modulation of the laser light by using a light source that outputs a single laser light, a digital signal to be transmitted, and the signal generation unit.
  • An optical modulator that modulates the laser light using the baseband signal generated by the above to generate an optical signal having a conjugate phase correlation centered on the fundamental frequency of the phase-sensitive amplifier and capable of phase-sensitive amplification.
  • An optical transmission system including an optical amplification unit that performs phase-sensitive amplification by a non-linear optical effect on the optical signal.
  • the digital signal to be transmitted is used to generate a baseband signal used for modulating the laser beam output from a light source that outputs a single laser beam, and the generated baseband is generated.
  • the laser beam is modulated using a signal to generate an optical signal having a conjugate phase correlation centered on the fundamental frequency of the phase-sensitive amplifier and capable of phase-sensitive amplification, and a nonlinear optical effect on the optical signal.
  • This is an optical amplification method for performing phase-sensitive amplification by.
  • One aspect of the present invention is a signal generation step of using a digital signal to be transmitted to generate a baseband signal used for modulation of the laser light output from a light source that outputs a single laser light, and the signal.
  • Light that modulates the laser beam with the baseband signal generated in the generation step to generate an optical signal that has a conjugate phase correlation around the fundamental frequency of the phase sensitive amplifier and is phase sensitive and amplifyable.
  • It is a computer program for causing a computer to execute a modulation step and an optical amplification step of performing phase-sensitive amplification by a nonlinear optical effect on the optical signal.
  • FIG. 1 is a system configuration diagram of the optical transmission system 100 according to the first embodiment.
  • the optical transmission system 100 includes an optical transmitter 10, an optical receiver 20, and an optical amplifier 30.
  • the optical transmitter 10 and the optical receiver 20 communicate with each other via the transmission line 40.
  • the transmission line 40 is a transmission line for transmitting an optical signal transmitted and received between the optical transmitter 10 and the optical receiver 20.
  • the transmission line 40 is, for example, an optical fiber.
  • An optical amplifier 30 is provided on the transmission line 40 between the optical transmitter 10 and the optical receiver 20.
  • the optical transmitter 10 generates a multi-carrier optical signal having a spectrum having a frequency arrangement symmetrical with respect to the frequency of the light source and a phase conjugate relationship.
  • the optical receiver 20 receives an optical signal transmitted from the optical transmitter 10 and amplified by the optical amplifier 30.
  • the optical amplifier 30 amplifies the optical signal transmitted from the optical transmitter 10.
  • the optical amplifier 30 is a phase-sensitive amplifier that performs phase-sensitive amplification by a nonlinear optical effect.
  • the optical amplifier 30 is, for example, a PSA. Further, the optical amplifier 30 has a function of compensating for wavelength dispersion.
  • the optical transmitter 10 includes a light source 11, a signal generation unit 12, an optical modulation unit 13, and a transmission unit 14.
  • the light source 11 continuously outputs a single laser beam.
  • a single laser beam means a laser beam having one wavelength.
  • the laser light output by the light source 11 will be referred to as continuous light.
  • the signal generation unit 12 generates a baseband signal used for modulation of continuous light output from the light source 11 by using a digital signal to be transmitted (hereinafter referred to as “transmission data”).
  • the signal generation unit 12 is composed of a multiplication unit 121 and an addition unit 122.
  • the multiplication unit 121 multiplies the transmission data with a complex number (exp (j ⁇ t)).
  • the addition unit 122 adds the multiplication result of the multiplication unit 121 and the complex conjugate of the multiplication result.
  • the signal generation unit 12 generates a baseband signal by performing such processing.
  • the optical modulation unit 13 modulates the continuous light output from the light source 11 using the baseband signal generated by the signal generation unit 12, has a coupled phase correlation centered on the basic frequency of the optical amplifier 30, and has a coupled phase correlation. , Generates an optical signal that can be phase-sensitive and amplified.
  • the optical modulation unit 13 is a modulator that performs amplitude modulation.
  • the transmission unit 14 transmits the optical signal generated by the optical modulation unit 13 to the transmission line 40.
  • FIG. 2 is a sequence diagram showing a processing flow of the optical transmission system 100 according to the first embodiment.
  • the process shown in FIG. 2 is executed by inputting transmission data to the optical transmitter 10.
  • the signal generation unit 12 generates a baseband signal using the input transmission data (step S101).
  • step S101 a specific method for generating a baseband signal by the signal generation unit 12 will be described.
  • the signal generation unit 12 generates a baseband signal necessary for simultaneously generating an optical signal and idler light by using a light source 11 that outputs a single continuous light and an optical modulator 12. Therefore, in the first embodiment, a method called subcarrier multiplexing is used for simultaneous generation of an optical signal and idler light (see, for example, Reference 1).
  • the signal generation unit 12 generates a signal of an arbitrary modulation format based on the transmission bit string in the input transmission data. Let this be x (t), and then the signal generation unit 12 generates a baseband signal s (t) by performing an operation based on the following equation (1) for a frequency ⁇ that is more than half of the symbol rate. Note that * in Eq. (1) represents the complex conjugate. (Reference 1: GP Agrawal, “Fiber-optic communication systems”, Vol. 222. John Wiley & Sons, 2012.)
  • the signal generation unit 12 inputs the generated baseband signal s (t) to the optical modulation unit 13.
  • the optical modulation unit 13 modulates the continuous light of the frequency ⁇ c output from the light source 11 with the input baseband signal s (t) (step S102). As a result, the optical modulation unit 13 generates a modulation signal.
  • the frequency ⁇ c is assumed to be equal to the fundamental frequency of the amplification medium (optical amplifier 30). Assuming that the time-varying phase fluctuation of continuous light is ⁇ (t), the electric field of the modulated signal is expressed by the following equation (2).
  • the modulated signal is a multi-carrier optical signal that shares a phase fluctuation and has a spectrum having a frequency arrangement symmetric with respect to the frequency of the light source 11 and a phase conjugate relationship.
  • the modulated signal is a signal in which an optical signal and idler light are subcarrier-multiplexed.
  • the optical modulation unit 13 outputs the generated modulation signal to the transmission line 40 via the transmission unit 14 (step S103).
  • the modulated signal output to the transmission line 40 is input to the optical amplifier 30.
  • the optical amplifier 30 amplifies the input modulated signal (step S104). For example, the optical amplifier 30 amplifies the modulated signal by the input modulated signal and the excitation light. The optical amplifier 30 outputs the amplified optical signal to the optical receiver 20 (step S105). The optical receiver 20 receives the modulated signal output from the optical amplifier 30 (step S105).
  • the modulation component has no imaginary component. Therefore, even if the original signal is a complex number such as a QAM signal, it can be realized by using a single amplitude modulator instead of the IQ modulator.
  • the signal generation unit 12 can also be realized by an analog circuit.
  • FIG. 3 is a schematic diagram of a demonstration experiment of the method in the first embodiment.
  • FIG. 4 is a diagram showing the results of a demonstration experiment of the method in the first embodiment.
  • the transmitter 200 shown in FIG. 3 corresponds to the optical transmitter 10 of FIG. 1
  • the PSA 400 corresponds to the optical amplifier 30 of FIG.
  • the fundamental frequency is 193 THz.
  • PPLN was used as the amplification medium of PSA400.
  • the optical signal and the excitation light were subjected to carrier recovery using the sum frequency generation described in Reference 2, and phase-locked using the optical PLL. (Reference 2: Y. Okamura, et al. “Optical pump phase locking to a carrier wave extracted from phase-conjugated twin waves for phase-sensitive optical amplifier repeaters”, Optics express 24.23 (2016))
  • a QAM signal in which an optical signal and idler light were subcarrier-multiplexed was generated, noise was added by attenuation, and then the signal was input to the PSA400.
  • a Nyquist filter was applied to the signal, the modulation speed was 10 Gbaud, and the frequency shift amount was 5.5 GHz.
  • the signal component was extracted and demodulated using a bandpass filter on the digital signal processing.
  • FIG. 5A shows the results of a demonstration experiment when PSA is used as an optical amplifier.
  • constellations obtained from 16QAM, 32QAM, and PS-256QAM signals are shown in order from the left.
  • FIG. 5A With reference to the constellation shown in FIG. 5A, it can be seen that amplification operations with less distortion are realized for each of the 16QAM, 32QAM, and PS-256QAM signals.
  • FIG. 5 (B) shows an example in which a similar experiment was performed by replacing PSA with EDFA for comparison with FIG. 5 (A).
  • the same subcarrier multiplex signal is used as the modulation method, and on the receiving side, only the signal component is extracted by a bandpass filter and demodulated.
  • the SNR was 4.6 dB higher on average when PSA was used in all modulation formats than when EDFA was used.
  • there is a wavelength diversity gain of 3 dB by using two waves of optical signal and idler light in principle but further SNR improvement effect can be confirmed, and it is shown that phase sensitive amplification operation is performed. Has been done.
  • the modulation of one laser beam has a phase relationship coupled to the optical signal and the optical signal without using an additional optical system. It can generate idler light. Therefore, it becomes possible to realize a non-degenerate phase-sensitive amplification operation with a simpler configuration of the optical transmitter 10.
  • PSA was used as the optical amplifier 30.
  • carrier recovery of the optical signal is performed by generating a sum frequency as used in the first embodiment, or a carrier component is transmitted as pilot light from the transmitting side as shown in Reference 3.
  • the method can be mentioned. Therefore, in the second embodiment, a configuration using light injection synchronization will be described.
  • FIG. 5 is a system configuration diagram of the optical transmission system 100a according to the second embodiment.
  • the optical transmission system 100a includes an optical transmitter 10a, an optical receiver 20, an optical amplifier 30, a demultiplexer 50, a circulator 60, a slave laser 61, and a combiner 70.
  • the optical amplifier 30, the duplexer 50, the circulator 60, the slave laser 61 and the combiner 70 may be configured as one PSA module.
  • the optical transmitter 10a generates a multi-carrier modulated signal having a spectrum having a frequency arrangement symmetrical with respect to the frequency of the light source and a phase conjugate relationship. At this time, the optical transmitter 10a generates an optical signal having a guard band in the vicinity of the DC component in the frequency domain, and the generated optical signal is provided with pilot light for phase synchronization of the excitation light of the optical amplifier 30 in the vicinity of the DC component.
  • the demultiplexer 50 demultiplexes the pilot light from the optical signal and the idler light in the modulated signal transmitted from the optical transmitter 10a.
  • the demultiplexer 50 outputs a signal obtained by removing the pilot light from the modulated signal (a signal of the demultiplexed optical signal and the idler light) to the first path to which the duplexer 70 is connected, and the demultiplexing pilot. Light is output to the second path to which the circulator 60 is connected.
  • the circulator 60 is a component having a plurality of ports.
  • the example shown in FIG. 5 shows an example in which the circulator 60 has three ports (first port to third port).
  • the first port of the circulator 60 is connected to the demultiplexer 50, the second port is connected to the slave laser 61, and the third port is directly or indirectly connected to the combiner 70.
  • the pilot light demultiplexed by the demultiplexer 50 is input to the first port, and the laser light output from the slave laser 61 is input to the second port.
  • the circulator 60 outputs the pilot light input from the first port to the slave laser 61.
  • the circulator 60 outputs the laser beam input from the second port to the combiner 70.
  • the third port of the circulator 60 and the combiner 70 may be directly connected by a transmission line or may be connected via a ⁇ 2 medium such as a PPLN waveguide.
  • the slave laser 61 outputs a laser beam having a high OSNR fundamental frequency in injection synchronization using pilot light input via the circulator 60.
  • the combiner 70 combines the optical signal input via the first path and the optical signal output from the slave laser 61.
  • the optical signal output from the slave laser 61 is input to the combiner 70 directly or via the ⁇ 2 medium.
  • the optical signal of the fundamental frequency becomes the desired excitation light as it is.
  • desired excitation light can be generated by generating light having a frequency twice the fundamental frequency by using the nonlinear optical effect.
  • FIG. 6 is a diagram showing a specific example of the first configuration of the optical transmitter 10a in the second embodiment
  • FIG. 7 shows a specific example of the second configuration of the optical transmitter 10a in the second embodiment. It is a figure.
  • each configuration will be described.
  • the optical transmitter 10a includes a light source 11, a signal generation unit 12a, an optical modulation unit 13, a transmitter unit 14, a demultiplexer 15, and a combiner 16.
  • the same components as those of the optical transmitter 10 in the first embodiment are designated by the same reference numerals, and the description thereof will be omitted.
  • the signal generation unit 12a generates a multi-carrier optical signal having a spectrum provided with a guard band by sufficiently increasing the frequency ⁇ .
  • the signal generation unit 12a outputs the generated optical signal to the optical modulation unit 13.
  • the demultiplexer 15 is provided between the light source 11 and the optical modulation unit 13, and demultiplexes the continuous light output from the light source 11.
  • the demultiplexer 15 outputs the demultiplexed continuous light to the first path to which the optical modulation unit 13 is connected and the second path to which the duplexer 16 is connected, respectively.
  • the pilot light is output to the combiner 16.
  • the combiner 16 is provided between the optical modulation unit 13 and the transmission unit 14, and combines the modulation signal output from the optical modulation unit 13 with the optical signal branched by the demultiplexer 15. As a result, the optical transmitter 10a can combine the pilot light with the modulated signal.
  • the optical transmitter 10a includes a light source 11, a signal generation unit 12, an optical modulation unit 13a, and a transmission unit 14.
  • the same components as those of the optical transmitter 10 in the first embodiment are designated by the same reference numerals, and the description thereof will be omitted.
  • the optical modulation unit 13a modulates the continuous light output from the light source 11 using the baseband signal generated by the signal generation unit 12, has a coupled phase correlation centered on the basic frequency of the optical amplifier 30, and has a coupled phase correlation. , Generates an optical signal that can be phase-sensitive and amplified.
  • the carrier frequency component remains due to the imperfections of the optical modulation section 13a.
  • the carrier frequency component remaining due to the imperfections of the optical modulation unit 13a is used as the pilot light.
  • the internal light is modulated by applying various voltages to the crystals in the modulator, and the bias voltage (modulation) applied at this time is applied. If the default voltage applied when not done) deviates from the ideal value, carrier frequency will occur.
  • the carrier frequency component thus generated is used as pilot light.
  • Pilot light is prone to unwanted non-linear effects, such as induced Brillouin scattering, in transmission lines or fiber amplifiers when its spectrum is narrow. Therefore, especially when high power is required, the non-linear effect is suppressed by widening the spectrum by some kind of random modulation (for example, high-frequency phase modulation is performed by demultiplexing the pilot light and incident on the phase modulator). Is also possible.
  • the technique of Reference 4 below may be used as a method of suppressing the non-linear effect by widening the spectrum. (Reference 4: Z. Tong, et al. “Towards ultrasensitive optical links enabled by low-noise phase-sensitive amplifiers.” Nature photonics, 5 (7), 430 (2011))
  • optical transmission system 100a in the second embodiment configured as described above, it is possible to support a method using pilot light. Therefore, it becomes possible to improve convenience.
  • the optical signal and the idler light are subcarrier-multiplexed in the baseband signal, it is possible to perform dispersion prediction by digital signal processing over both bands. Therefore, in the third embodiment, a configuration for predicting the wavelength dispersion generated by transmission at the time of optical modulation on the transmitting side will be described.
  • the optical transmission system 100 in the third embodiment is the same as that in the first embodiment except that the optical transmitter 10b is provided in place of the optical transmitter 10.
  • FIG. 8 is a diagram showing the configuration of the optical transmitter 10b according to the third embodiment.
  • the optical transmitter 10b includes a light source 11, a signal generation unit 12b, an optical modulation unit 13b, and a transmission unit 14.
  • the optical transmitter 10b is different from the optical transmitter 10 in that it includes a signal generation unit 12b and an optical modulation unit 13b in place of the signal generation unit 12 and the optical modulation unit 13.
  • the optical transmitter 10b is the same as the optical transmitter 10 in other configurations. Therefore, the description of the entire optical transmitter 10b will be omitted, and the No. generation unit 12b and the optical modulation unit 13b will be described.
  • the signal generation unit 12b uses the transmission data to generate a baseband signal used for modulating the continuous light output from the light source 11.
  • the signal generation unit 12b includes a multiplication unit 121, an addition unit 122, and a dispersion imparting unit 123.
  • the dispersion imparting unit 123 imparts the wavelength dispersion obtained by inverting the sign of the wavelength dispersion generated in the transmission line 40 between the transmission unit 14 and the optical amplifier 30 to the baseband signal generated by the multiplication unit 121 and the addition unit 122. do. In this way, the dispersion imparting unit 123 can generate an optical signal with a phase change that cancels the wavelength dispersion of the transmission path 40 between the transmission unit 14 and the optical amplifier 30.
  • an IQ modulator is required because an imaginary number component remains due to dispersion preequalization.
  • the optical modulation unit 13b included in the optical transmitter 10b is an IQ modulator, and performs modulation by inputting an optical signal of the I component and an optical signal of the Q component calculated from the dispersion imparting unit.
  • the multiplication unit 121 and the addition unit 122 generate a baseband signal in which the optical signal and the idler light are subcarrier-multiplexed.
  • the dispersion imparting unit 123 applies the wavelength dispersion obtained by inverting the sign of the wavelength dispersion generated in the transmission line to the baseband signal. Gives wavelength dispersion.
  • Examples of the method for calculating the wavelength dispersion include an overlap cut method. A specific method of the overlap cut method is described in Reference 5 below. (Reference 5: R. Kudo, T. Kobayashi, K. Ishihara, Y. Takatori, A. Sano, and Y. Miyamoto, “Coherent Optical Single Carrier Transmission Using Overlap Frequency Domain Equalization for Long-Haul Optical Systems,” Journal of Lightwave Technology, 27, 16, 3721 (2009).)
  • the optical modulation unit 13b modulates the continuous light output from the light source 11 with the baseband signal.
  • the wavelength dispersion imparted by the optical transmitter 10b is offset by the wavelength dispersion associated with the transmission. This eliminates the wavelength dispersion at the amplification point and enables ideal PSA operation without the use of optical dispersion compensation.
  • the optical transmitters 10, 10a, 10b may be configured to include an optical amplifier 30.
  • the optical transmitters 10 and 10b may include an optical amplifier 30 after the transmission unit 14 and may be configured as an optical amplifier.
  • the optical transmitter 10a may include a PSA module after the transmission unit 14 and may be configured as an optical amplifier.
  • optical transmitters 10, 10a, 10b in the above-described embodiment may be realized by a computer.
  • the program for realizing this function may be recorded on a computer-readable recording medium, and the program recorded on the recording medium may be read by a computer system and executed.
  • the term "computer system” as used herein includes hardware such as an OS and peripheral devices.
  • the "computer-readable recording medium” refers to a portable medium such as a flexible disk, a magneto-optical disk, a ROM, or a CD-ROM, and a storage device such as a hard disk built in a computer system.
  • a "computer-readable recording medium” is a communication line for transmitting a program via a network such as the Internet or a communication line such as a telephone line, and dynamically holds the program for a short period of time. It may also include a program that holds a program for a certain period of time, such as a volatile memory inside a computer system that is a server or a client in that case. Further, the above program may be for realizing a part of the above-mentioned functions, and may be further realized for realizing the above-mentioned functions in combination with a program already recorded in the computer system. It may be realized by using a programmable logic device such as FPGA (Field Programmable Gate Array).
  • FPGA Field Programmable Gate Array
  • the present invention can be applied to a technique for performing phase-sensitive amplification.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
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Abstract

Système de transport de lumière comprenant : une source de lumière qui émet une seule lumière laser ; une unité de génération de signal qui génère, à l'aide d'un signal numérique à transmettre, un signal de bande de base à utiliser pour moduler la lumière laser ; une unité de modulation de lumière qui module la lumière laser au moyen du signal de bande de base généré par l'unité de génération de signal, générant ainsi un signal optique ayant une corrélation de phase qui est conjuguée à la fréquence fondamentale d'un amplificateur sensible à la phase qui est centré, ledit signal optique pouvant être soumis à une amplification sensible à la phase ; et une unité d'amplification de lumière qui met en œuvre une amplification sensible à la phase à l'aide d'un effet optique non linéaire par rapport au signal optique.
PCT/JP2020/039400 2020-10-20 2020-10-20 Système de transport de lumière, procédé d'amplification de lumière et programme informatique WO2022085075A1 (fr)

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JP2019004253A (ja) * 2017-06-13 2019-01-10 日本電信電話株式会社 光増幅装置およびそれを用いた光伝送システム

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Publication number Priority date Publication date Assignee Title
JP2019004253A (ja) * 2017-06-13 2019-01-10 日本電信電話株式会社 光増幅装置およびそれを用いた光伝送システム

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* Cited by examiner, † Cited by third party
Title
OKAMURA YASUHIRO; KONDO KOTARO; SEKI SHINGO; OHMICHI YUYA; KOGA MASAFUMI; TAKADA ATSUSHI: "Frequency nondegenerate optical parametric phase-sensitive amplifier repeater by using recovered pump carrier generated from phase-conjugated twin waves", 2016 OPTICAL FIBER COMMUNICATIONS CONFERENCE AND EXHIBITION (OFC), OSA, 20 March 2016 (2016-03-20), pages 1 - 3, XP032942461 *

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