WO2017145901A1 - Système de communication optique, dispositif de transmission optique et dispositif de réception optique - Google Patents

Système de communication optique, dispositif de transmission optique et dispositif de réception optique Download PDF

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Publication number
WO2017145901A1
WO2017145901A1 PCT/JP2017/005622 JP2017005622W WO2017145901A1 WO 2017145901 A1 WO2017145901 A1 WO 2017145901A1 JP 2017005622 W JP2017005622 W JP 2017005622W WO 2017145901 A1 WO2017145901 A1 WO 2017145901A1
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Prior art keywords
optical
mode
wavelength
optical signal
signal
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PCT/JP2017/005622
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English (en)
Japanese (ja)
Inventor
多賀　秀徳
大樹 相馬
雄太 若山
五十嵐　浩司
釣谷　剛宏
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Kddi株式会社
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Priority claimed from JP2016034708A external-priority patent/JP6725995B2/ja
Priority claimed from JP2016034709A external-priority patent/JP6725996B2/ja
Application filed by Kddi株式会社 filed Critical Kddi株式会社
Publication of WO2017145901A1 publication Critical patent/WO2017145901A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/04—Mode multiplex systems

Definitions

  • the present invention relates to an optical communication technology, and more particularly to an optical communication system, an optical transmission device, and an optical reception device to which both mode multiplexing technology and wavelength multiplexing technology are applied.
  • Mode multiplexing technology which is one of space division multiplexing
  • a multimode fiber that has multiple modes of optical signals that can propagate through one core of the optical fiber is used as a transmission line.
  • Patent Document 1 discloses a technique for generating a plurality of optical signals of different modes and transmitting a multiplexed signal through one core of a multimode fiber.
  • An optical communication system using the mode multiplexing technique as described above is generally configured by connecting a transmission side device (optical transmission device) and a reception side device (optical reception device) by a multimode fiber.
  • An optical transmitter includes an optical transmitter, a converter that converts a mode of an optical signal generated by the optical transmitter from a basic mode to a higher-order mode, and a mode multiplexer that multiplexes a plurality of modes to generate a mode multiplexed signal.
  • Consists of The optical receiver includes a mode separator that separates the received mode multiplexed signal into optical signals of individual modes, a mode converter that converts the mode of each separated optical signal to a basic mode, and an optical receiver. Is done.
  • Non-Patent Document 1 shows a configuration and experimental results in which both wavelength multiplexing technology and mode multiplexing technology are employed in a laboratory environment. However, Non-Patent Document 1 merely shows an example in which basically the same information is multiplexed and transmitted, and no practical configuration example of the optical transmission device and the optical transmission device is shown.
  • the present invention has been made in view of the above-described problems. It is an object of the present invention to provide a technique for realizing an optical communication system that transmits an optical signal by using a wavelength multiplexing technique and a mode multiplexing technique together.
  • the present invention can be realized as, for example, an optical communication system, an optical transmitter, and an optical receiver.
  • An optical communication system is an optical communication system including an optical transmission device and an optical reception device that receives an optical signal transmitted from the optical transmission device, and the optical transmission device includes: First and second wavelength multiplexers that generate wavelength-multiplexed signals by multiplexing a plurality of fundamental mode optical signals that are independently modulated and have different wavelengths, and the second wavelength A mode converter for converting a wavelength multiplexed signal generated by a multiplexer from the fundamental mode to a higher order mode; a wavelength multiplexed signal of the fundamental mode generated by the first wavelength multiplexer; and the higher order mode.
  • a mode multiplexer that generates an optical signal to be transmitted to the optical receiver by multiplexing the wavelength-multiplexed signal of the optical receiver, and the optical receiver receives the optical signal received from the optical transmitter ,That A wavelength separator that separates into a plurality of optical signals of different wavelengths, and a plurality of receiving units that correspond to different wavelengths and that receive optical signals of the corresponding wavelengths from the wavelength separators, respectively, Each receiving unit separates the input optical signal into the fundamental mode optical signal and the higher order mode optical signal, and the higher order mode light output from the mode separator.
  • a mode converter that converts the signal from the higher-order mode to the fundamental mode, the fundamental mode optical signal output from the mode separator, and the fundamental mode output from the mode converter. An optical signal reception process is performed.
  • An optical transmission device is an optical transmission device that transmits an optical signal to an optical reception device, and each of a plurality of fundamental mode optical signals that are independently modulated and have different wavelengths.
  • the first and second wavelength multiplexers that generate wavelength multiplexed signals by multiplexing, and the mode that converts the wavelength multiplexed signals generated by the second wavelength multiplexer from the basic mode to the higher order mode
  • An optical receiving apparatus is an optical receiving apparatus that receives an optical signal transmitted from an optical transmitting apparatus, and the optical signal received from the optical transmitting apparatus is converted into a plurality of light beams having different wavelengths.
  • a wavelength separator that separates signals, and a plurality of receiving units that correspond to different wavelengths and that receive optical signals of corresponding wavelengths from the wavelength separators, respectively, and each receiving unit includes the input
  • a mode separator that separates the optical signal generated into a fundamental mode optical signal and a higher-order mode optical signal, and the higher-order mode optical signal output from the mode separator from the higher-order mode.
  • An optical communication system is an optical communication system including an optical transmission device and an optical reception device that receives an optical signal transmitted from the optical transmission device, and the optical transmission device. Includes first and second wavelength multiplexers that generate wavelength multiplexed signals by multiplexing a plurality of fundamental mode optical signals that are independently modulated and have different wavelengths, and A mode converter that converts the wavelength multiplexed signal generated by the wavelength multiplexer from the fundamental mode to a higher order mode, the wavelength multiplexed signal of the fundamental mode generated by the first wavelength multiplexer, A mode multiplexer that generates an optical signal to be transmitted to the optical receiver by multiplexing the wavelength-division multiplexed signal of the next mode, and the optical receiver receives the optical signal received from the optical transmitter Signal A mode separator that separates the fundamental mode optical signal and the higher-order mode optical signal, and the higher-order mode optical signal output from the mode separator is converted from the higher-order mode to the fundamental mode.
  • a mode converter a first wavelength separator that separates the fundamental mode optical signal output from the mode separator into a plurality of optical signals each having a different wavelength, and the output from the mode converter.
  • a second wavelength separator that separates the optical signal of the fundamental mode into a plurality of optical signals of different wavelengths, and corresponds to different wavelengths, and is output from the first and second wavelength separators; And a plurality of receiving units that perform reception processing of optical signals of corresponding wavelengths.
  • An optical communication system is an optical communication system including an optical transmission device and an optical reception device that receives an optical signal transmitted from the optical transmission device, and the optical transmission device.
  • a plurality of generation units for generating mode multiplexed signals each having a different wavelength, wherein each generation unit is independently modulated, and the first and second fundamental modes having a single wavelength Of the optical signals, a mode converter that converts the second optical signal from the fundamental mode to a higher-order mode; the first optical signal in the fundamental mode; and the second optical signal in the higher-order mode.
  • a plurality of mode multiplexing signals each having a different wavelength output from the plurality of generation units, and a mode multiplexer that generates a mode multiplexed signal by multiplexing.
  • a wavelength multiplexer that generates an optical signal to be transmitted to the optical receiver by multiplexing, and the optical receiver converts the optical signal received from the optical transmitter to the optical signal in the basic mode.
  • a mode separator that separates the signal into a higher-order mode optical signal, and a mode converter that converts the higher-order mode optical signal output from the mode separator from the higher-order mode to the fundamental mode;
  • a first wavelength separator that separates the fundamental mode optical signal output from the mode separator into a plurality of optical signals having different wavelengths, and the fundamental mode optical signal output from the mode converter.
  • a second wavelength separator that separates the light into a plurality of optical signals having different wavelengths, and light of the corresponding wavelengths that correspond to different wavelengths and are output from the first and second wavelength separators, respectively.
  • Reception of signal A plurality of receiving units for performing processing, characterized in that it comprises a.
  • An optical transmission apparatus is an optical transmission apparatus that transmits an optical signal to an optical reception apparatus, and is a plurality of generation units that generate mode-multiplexed signals having different wavelengths, respectively.
  • Each generation unit is independently modulated and converts the second optical signal from the fundamental mode to the higher order mode among the first and second optical signals of the fundamental mode having a single wavelength.
  • a mode converter that generates a mode multiplexed signal by multiplexing the first optical signal in the fundamental mode and the second optical signal in the higher order mode, and A plurality of generation units, and a wavelength multiplexer that generates an optical signal to be transmitted to the optical receiver by multiplexing a plurality of mode multiplexed signals output from the plurality of generation units, each having a different wavelength. Characterized in that it comprises a.
  • An optical receiving apparatus is an optical receiving apparatus that receives an optical signal transmitted from an optical transmitting apparatus, and the optical signal received from the optical transmitting apparatus is converted into an optical signal in a basic mode.
  • a mode separator that separates the high-order mode optical signal, and a mode converter that converts the high-order mode optical signal output from the mode separator from the high-order mode to the fundamental mode;
  • a first wavelength separator that separates the fundamental mode optical signal output from the mode separator into a plurality of optical signals of different wavelengths, and the fundamental mode optical signal output from the mode converter,
  • a second wavelength separator that separates a plurality of optical signals having different wavelengths, and a second wavelength separator that corresponds to a different wavelength, and that is output from the first and second wavelength separators, Perform receive processing Characterized in that it comprises a plurality of receiving units, the.
  • An optical communication system is an optical communication system including an optical transmission device and an optical reception device that receives an optical signal transmitted from the optical transmission device, and the optical transmission device.
  • a plurality of generation units for generating mode multiplexed signals each having a different wavelength, wherein each generation unit is independently modulated, and the first and second fundamental modes having a single wavelength Of the optical signals, a mode converter that converts the second optical signal from the fundamental mode to a higher-order mode; the first optical signal in the fundamental mode; and the second optical signal in the higher-order mode.
  • a plurality of mode multiplexing signals each having a different wavelength output from the plurality of generation units, and a mode multiplexer that generates a mode multiplexed signal by multiplexing.
  • a wavelength multiplexer that generates an optical signal to be transmitted to the optical receiving device by multiplexing, and the optical receiving device converts the optical signal received from the optical transmitting device into a plurality of different wavelengths.
  • a wavelength separator that separates the optical signal, and a plurality of receiving units that correspond to different wavelengths, and each receives an optical signal of a corresponding wavelength from the wavelength separator, each receiving unit,
  • a mode separator that separates the input optical signal into the optical signal of the fundamental mode and the optical signal of the higher-order mode, and the optical signal of the higher-order mode that is output from the mode separator.
  • a mode converter for converting from the next mode to the fundamental mode, the fundamental mode optical signal output from the mode separator, and the fundamental mode optical signal output from the mode converter. And performing reception processing.
  • optical communication system that transmits optical signals by using both wavelength multiplexing technology and mode multiplexing technology.
  • FIG. 1 is a block diagram showing a configuration of an optical communication system.
  • 1 is a block diagram showing a configuration of an optical transmission device 10.
  • FIG. FIG. 2 is a block diagram showing a configuration of an optical receiving device 30.
  • FIG. 3 is a diagram illustrating an example of an actual device configuration of the optical transmission device 10.
  • FIG. 3 is an explanatory diagram of an example of upgrade of the optical transmission device 10.
  • FIG. 3 is an explanatory diagram of an example of upgrade of the optical transmission device 10.
  • FIG. 1 is a block diagram showing a configuration of an optical transmission device 10.
  • FIG. FIG. 2 is a block diagram showing a configuration of an optical receiving device 30.
  • FIG. 3 is a diagram illustrating an example of an actual device configuration of an optical receiving device 30.
  • FIG. 3 is an explanatory diagram of an example of upgrade of the optical transmission device 10. Explanatory drawing of the example of the upgrade of the optical receiver 30.
  • FIG. Explanatory drawing of the example of the upgrade of the optical receiver 30.
  • FIG. Explanatory drawing of the example of the upgrade of the optical receiver 30.
  • FIG. 1 is a block diagram illustrating the configuration of the optical communication system according to the first embodiment.
  • the optical communication system includes an optical transmission device 10 and an optical reception device 30 that can communicate with the optical transmission device 10 via an optical transmission path 50.
  • the optical transmission line 50 between the optical transmitter 10 and the optical receiver 30 includes a multimode optical fiber 51 and a multimode optical amplifier 52 for relay amplification of optical signals.
  • the optical transmission device 10 generates a plurality of optical signals in the basic mode (LP01 mode), performs wavelength multiplexing of these, and further performs mode multiplexing to generate an optical signal to be transmitted to the optical reception device.
  • the optical receiver 30 performs wavelength separation of the optical signal received from the optical transmitter 10 and further performs mode separation to separate the multiplexed signal into a plurality of optical signals in the basic mode. Performs optical signal reception processing.
  • a configuration example of an optical communication system in which the optical transmission device 10 performs mode multiplexing after performing wavelength multiplexing, and the optical receiving device 30 performs mode separation after performing wavelength separation. Indicates.
  • the optical transmitter 10 includes a wavelength multiplexer 15 (15a, 15b, 15c,%), A mode converter 16 (16b, 16c,%), A mode multiplexer 17, and a generation unit 20 (20-1, 20-1). 20-2, 20-3, ).
  • a maximum number of generation units 20 equal to the number of wavelengths that can be multiplexed by the wavelength multiplexer 15 are provided.
  • the maximum number of wavelength multiplexers 15 equal to the number of modes that can be multiplexed by the mode multiplexer 17 is provided.
  • the number of mode converters 16 equal to the number of wavelength multiplexers 15 (15b, 15c,...) Corresponding to higher order modes (for example, LP11a mode, LP11b mode, LP02 mode, etc.) is provided.
  • the plurality of generation units 20 correspond to different wavelengths ⁇ ( ⁇ 1 , ⁇ 2 , ⁇ 3 ,...) And generate optical signals having corresponding wavelengths.
  • the generation units 20-1, 20-2, and 20-3 generate optical signals having wavelengths ⁇ 1 , ⁇ 2 , and ⁇ 3 , respectively.
  • the generation unit 20-1 will be mainly described.
  • the other generation units 20 may be configured in the same manner as the generation unit 20-1, except that the wavelength ⁇ of the light generated by the light source 11 is different. Is possible.
  • the generation unit 20-1 includes a single light source 11, an optical branch circuit 12, an optical modulator 13 (13a, 13b,%), And an optical amplifier 14 (14a, 14b,).
  • the light source 11 generates and outputs fundamental mode light having a wavelength ⁇ 1 .
  • the plurality of optical modulators 13 correspond to different modes, respectively, and modulate the light output from the light source 11 independently (that is, modulate with different input signals), so that the optical signal of the basic mode is obtained. Are generated respectively.
  • the optical modulator 13a corresponds to the basic mode (LP01 mode)
  • the optical modulator 13b corresponds to the higher-order mode (LP11a mode).
  • each optical modulator 13 an optical amplifier 14 for adjusting the power of the optical signal generated by each optical modulator 13 is provided.
  • the set of the optical modulator 13 and the optical amplifier 14 corresponding to the same one mode functions as an optical transmitter (FIG. 4) corresponding to the one mode.
  • an optical attenuator may be used, or both an optical amplifier and an optical attenuator may be used.
  • the generation unit 20-1 it is also possible to provide light sources individually for a plurality of optical transmitters corresponding to different modes. However, it may be technically difficult to maintain the wavelength of light output from all of these light sources at the same wavelength. For this reason, in the present embodiment, the light output from the single light source 11 is branched by the optical branch circuit 12, and the branched (divided) light is modulated by each of the optical modulators 13. A common light source 11 is used in the vessel 13.
  • the plurality of wavelength multiplexers 15 correspond to different modes.
  • the wavelength multiplexer 15a corresponds to the fundamental mode
  • the wavelength multiplexer 15b corresponds to the higher order mode (LP11a mode)
  • the wavelength multiplexer 15c corresponds to the higher order mode (LP11b mode).
  • the wavelength multiplexer 15a is an example of a first wavelength multiplexer
  • Other than the wavelength multiplexer 15a are examples of a second wavelength multiplexer. .
  • Each wavelength multiplexer 15 has a fundamental mode having different wavelengths ⁇ ( ⁇ 1 , ⁇ 2 , ⁇ 3 ,...) Generated by the optical modulator 13 corresponding to the same mode as the wavelength multiplexer.
  • a plurality of optical signals are input from the plurality of generation units 20.
  • a plurality of fundamental mode optical signals having different wavelengths ⁇ generated by the optical modulator 13 a corresponding to the fundamental mode are input from the plurality of generation units 20 to the wavelength multiplexer 15 a.
  • a plurality of fundamental mode optical signals having different wavelengths ⁇ generated by the optical modulator 13b corresponding to the higher order mode (LP11b mode) are input from the plurality of generation units 20 to the wavelength multiplexer 15b. .
  • Each wavelength multiplexer 15 generates a wavelength multiplexed signal by multiplexing a plurality of fundamental mode optical signals that are independently modulated and have different wavelengths. In this way, the plurality of wavelength multiplexers 15 respectively generate and output fundamental mode wavelength multiplexed signals.
  • the wavelength multiplexed signal output from the wavelength multiplexer 15 a corresponding to the basic mode is input to the mode multiplexer 17.
  • the wavelength multiplexed signals output from the wavelength multiplexers 15 (15b, 15c,%) Corresponding to the higher-order modes are respectively input to the mode converters 16 (16b, 16c,).
  • the mode converter 16 converts the wavelength multiplexed signal of the fundamental mode generated by the wavelength multiplexer 15 from the fundamental mode to a higher order mode, and outputs the converted wavelength multiplexed signal to the mode multiplexer 17.
  • the mode converter 16b converts the fundamental mode wavelength multiplexed signal from the fundamental mode to a higher-order mode (LP11a mode), and the mode converter 16c converts the fundamental mode wavelength multiplexed signal from the fundamental mode to the higher mode. Conversion to the next mode (LP11b mode).
  • the mode multiplexer 17 receives the wavelength multiplexed signal of the fundamental mode generated by the wavelength multiplexer 15a and the wavelength multiplexed signal of the higher order mode output from the mode converter 16 (16b, 16c, etc Is done.
  • the mode multiplexer 17 generates an optical signal to be transmitted to the optical receiver 30 by multiplexing the input wavelength multiplexed signals (mode multiplexing). Since the mode converter 16 and the mode multiplexer 17 are wavelength-multiplexed signals, devices having as little wavelength dependence as possible are employed for them.
  • the optical modulator 13, the optical amplifier 14, and the wavelength multiplexer 15 need only support the fundamental mode, and there is an advantage that the mode dependency of those optical devices does not become a problem. is there.
  • the number of mode converters 16 and mode multiplexers 17 which are devices required for mode multiplexing is small, the introduction cost of the apparatus can be made relatively low.
  • FIG. 4 is a diagram illustrating an example of an actual device configuration of the optical transmission device 10 to cope with such a problem.
  • the optical transmission device 10 includes an optical transmitter rack in which a plurality of optical transmitters are mounted, and a multiplexer rack in which the wavelength multiplexer 15, the mode converter 16, and the mode multiplexer 17 are mounted.
  • the optical transmitters corresponding to all modes are mounted adjacent to the same stage in units of wavelengths (that is, for each generation unit 20), and the common light source 11 is mounted in the vicinity thereof. Is done.
  • the wavelength multiplexer 15, the mode converter 16, and the mode multiplexer 17 are mounted on a multiplexer rack that is a rack independent of these optical transmitters.
  • the optical transmitter rack and the multiplexer rack are optically connected so as to realize the connection relationship between the optical transmitter (the optical modulator 13 and the optical amplifier 14) and the wavelength multiplexer 15. Connected by fiber. In this way, the actual device configuration of the optical transmission device 10 can be realized.
  • the mode converter 16 and the mode multiplexer 17 are separated from each other. However, it is also possible to adopt a configuration in which these are integrated.
  • the optical receiver 30 includes a wavelength separator 31 and a receiving unit 40 (40-1, 40-2, 40-3,).
  • Each receiving unit 40 includes a mode separator 32, a mode converter 33 (33b, 33c,...), An optical hybrid circuit 34, a light receiving element 35, a sampling processing unit 36, a MIMO processing unit 37, a carrier estimation unit 38, and A code reproduction unit 39 is included.
  • the receiving units 40 are provided in the maximum number equal to the number of wavelengths separable by the wavelength separator 31, that is, the mode separator 32 is equal to the maximum number of wavelengths separable by the wavelength separator 31. There are as many as there are.
  • the optical hybrid circuit 34 and each device subsequent thereto are provided in a number equal to the number of modes separable by the mode separator 32 at maximum. However, for the light receiving element 35, two light receiving elements corresponding to the I channel and the Q channel are provided for each mode. Also, only one MIMO processing unit 37 is provided for each receiving unit because processing is performed across all modes. Further, the number of mode converters 33 equal to the number of optical hybrid circuits 34 corresponding to higher-order modes (for example, LP11a mode, LP11b mode, LP02 mode, etc.) is provided.
  • the wavelength separator 31 receives a plurality of optical signals received from the optical transmitter 10 via the optical transmission line 50 and has a plurality of different single wavelengths ⁇ ( ⁇ 1 , ⁇ 2 , ⁇ 3 , etc Separate into optical signals.
  • the plurality of receiving units 40 correspond to different wavelengths ⁇ , and optical signals having corresponding wavelengths are respectively input from the wavelength separator 31.
  • optical signals having wavelengths ⁇ 1 , ⁇ 2 , and ⁇ 3 are input to the receiving units 40-1, 40-2, and 40-3, respectively. Since the wavelength separator 31 is processed with a mode multiplexed signal, a device having mode dependence as small as possible is employed for the wavelength separator 31.
  • the receiving unit 40-1 will be mainly described, but the other receiving units 40 are configured in the same manner as the receiving unit 40-1, except that the wavelength of light generated by the local light source 41 is different. Is possible.
  • the mode separator 32 converts the optical signal having the wavelength ⁇ 1 input from the wavelength separator 31 into an optical signal in a fundamental mode and an optical signal in a higher order mode (LP11a mode, LP11b mode, etc.). To output.
  • the optical signal in the basic mode is input to the optical hybrid circuit 34 corresponding to the basic mode.
  • Each optical signal corresponding to the higher order mode is input to the corresponding mode converter 33 (33b, 33c,).
  • the mode converter 33 converts the higher-order mode optical signal output from the mode separator 32 from the higher-order mode to the basic mode and outputs the converted signal.
  • the mode converter 33b converts a high-order mode (LP11a mode) optical signal into a basic mode
  • the mode converter 33c converts a high-order mode (LP11b mode) optical signal into a basic mode.
  • the optical signal output from each mode converter 33 is input to an optical hybrid circuit 34 connected to the mode converter 33 (corresponding to a higher-order mode).
  • the plurality of optical hybrid circuits 34 and their subsequent devices perform reception processing of the fundamental mode optical signal output from the mode separator 32 and the fundamental mode optical signal output from each mode converter 33.
  • the optical hybrid circuit 34 performs coherent detection (coherent reception) of the optical signal by mixing the input optical signal and local light.
  • each receiving unit 40 is provided with a single local light source 41.
  • the light output from the single local light source 41 is branched by the optical branch circuit 42, and the branched (divided) light is used in each optical hybrid circuit 34, whereby a plurality of optical hybrids are used.
  • a common local light source 41 is used in the circuit 34.
  • the optical signal output from the optical hybrid circuit 34 and obtained by coherent detection is converted into an electric signal by the light receiving element 35.
  • the electrical signal is converted from an analog signal to a digital signal by the sampling processing unit 36.
  • a plurality of electrical signals (digital signals) corresponding to the same wavelength and corresponding to different modes are input from the plurality of sampling processing units 36 corresponding to the different modes to the MIMO processing unit 37, respectively.
  • the MIMO processing unit 37 performs MIMO signal processing on a plurality of input digital signals to suppress crosstalk noise between modes, and obtains a signal corresponding to each mode obtained as a result, as a carrier signal. It outputs to the estimation part 38. Thereafter, carrier estimation processing is performed by the carrier estimation unit 38, and the transmission digital code is reproduced by the code reproduction unit 39. Thereafter, error correction processing or the like may be performed as necessary.
  • a temporal skew between a plurality of signals input to the MIMO processing unit 37 becomes a problem.
  • all of the optical devices used until the optical signal is converted into an electrical signal after the mode separation by the mode separator 32 can be arranged in close proximity.
  • the mode separator 32 and the mode converter 33 only need to support a single wavelength, and the design and manufacture of these optical devices can be facilitated. There is an advantage that the wavelength dependence of the optical device does not become a problem.
  • the mode separator 32 and the mode converter 33 are separated from each other. However, it is also possible to adopt a configuration in which these are integrated.
  • the mode converter 33 (33b, 33c,...) Does not exist.
  • each optical signal corresponding to the higher order mode output from the mode separator 32 is input to the corresponding optical hybrid circuit 34.
  • the mode does not match between the input optical signal and the light output from the local light source 41.
  • the signal-to-noise ratio (S / N) of the optical signal output from the optical hybrid circuit 34 may be reduced.
  • the decrease in S / N can be compensated for by increasing the power of the local light source 41.
  • the optical transmission apparatus 10 performs mode multiplexing after performing wavelength multiplexing, and the optical receiving apparatus 30 performs mode separation after performing wavelength separation.
  • a system can be realized.
  • Example 2 When performing an upgrade that gradually increases the transmission capacity of the optical communication system as in the first embodiment, it is assumed that necessary devices are added in units of wavelengths or modes. In the present embodiment, a configuration example that enables such an upgrade for each of the optical transmission device 10 and the optical reception device 30 will be described. In the following, the present embodiment will be described focusing on the differences from the first embodiment.
  • the optical transmission device 10 is mounted in a rack configuration as shown in FIG.
  • the optical transmission device 10 includes a wavelength multiplexer 15, a wavelength multiplexer 15, and a mode multiplexer 17 corresponding to the added higher-order mode in order to enable addition of a higher-order mode to be transmitted.
  • a mode converter 16 provided therebetween can be added.
  • the optical transmitter 10 is configured such that an optical transmitter (the optical modulator 13 and the optical amplifier 14) corresponding to the added higher-order mode can be added to each generation unit 20.
  • each generation unit 20 of the optical transmitter 10 is configured such that the optical transmitter to be added can be connected to the light source 11 via the optical branch circuit 12.
  • An optical connector for connection may be provided in advance at a location where the wavelength multiplexer 15, the mode converter 16 and the optical transmitter are connected (added) in the optical transmitter 10.
  • the number of generation units 20 equal to the number of wavelengths multiplexed by the wavelength multiplexer 15 may be provided in advance, or the number of generation units 20 is increased sequentially as the number of multiplexed wavelengths increases. May be.
  • the upgrade of the optical transmission device 10 can be performed in stages according to the following procedure.
  • the initial stage of introduction of the optical transmitter 10 as shown in FIG. 5, only the number of required wavelengths of optical transmitters corresponding to mode 1 (basic mode) are mounted on the optical transmitter rack.
  • a wavelength multiplexer 15 a corresponding to mode 1 (basic mode) and a final mode multiplexer 17 that transmits an optical signal to the optical transmission line 50 are mounted on the multiplexer rack.
  • an optical device corresponding to mode 2 (for example, LP11a mode), which is a higher-order mode, is newly mounted in the optical transmitter rack and the multiplexer rack.
  • mode 2 for example, LP11a mode
  • optical transmitters corresponding to mode 2 are newly installed in the optical transmitter rack by the number of necessary wavelengths.
  • a wavelength multiplexer 15b corresponding to mode 2 and a mode converter 16b corresponding to the wavelength multiplexer 15b are newly mounted on the multiplexer rack.
  • each receiving unit 40 shown in FIG. 3 corresponds to one wavelength, and corresponds to a processing block necessary for receiving all modes of optical signals multiplexed on the one wavelength. To do. Therefore, in order to realize the upgrade of the optical receiver 30 in units of one wavelength, the optical unit and the electric circuit are added to the optical receiver 30 using the reception unit 40 shown in FIG. Good.
  • the optical receiving device 30 includes an optical hybrid circuit 34 corresponding to the added higher-order mode and the optical hybrid circuit 34 and the mode corresponding to the added higher-order mode in order to enable addition of a higher-order mode to be received.
  • a mode converter 33 provided between the separator 32 can be added to each receiving unit 40.
  • each receiving unit 40 is configured so that the optical hybrid circuit 34 to be added can be connected to the local light source 41 via the optical branch circuit 42. ing.
  • each receiving unit 40 includes a mode separator 32, a local light source 41, an optical branching circuit 42, a light receiving element 35, and all electric circuits (sampling processing unit 36, MIMO processing unit 37, carrier estimation unit 38, and A code reproduction unit 39) is provided in advance.
  • the upgrade of the optical receiver 30 in one mode unit is realized by adding an optical device to the optical receiver 30 using the mode converter 33 and the optical hybrid circuit 34 as an expansion unit. it can.
  • An optical connector for connection may be provided in advance at a location where the mode converter 33 and the optical hybrid circuit 34 are connected (added) in the optical receiver 30.
  • the upgrade of the optical receiver 30 can be easily realized as an additional package.
  • a new receiving unit 40 may be added as described above, or the number of wavelengths separated by the wavelength separator 31 The number of receiving units 40 equal to may be provided in advance.
  • each of the optical transmission device 10 and the optical reception device 30 can be upgraded step by step in one mode and one wavelength unit, and the equipment required for the initial introduction can be saved, and the initial introduction cost can be reduced. Reduction is possible.
  • the optical transmission device 10 generates a plurality of optical signals in the basic mode (LP01 mode), performs mode multiplexing of these signals, and further performs wavelength multiplexing, thereby providing an optical reception device.
  • An optical signal to be transmitted to is generated.
  • the optical reception device 30 performs mode separation of the optical signal received from the optical transmission device 10 and further performs wavelength separation to separate the multiplexed signal into a plurality of optical signals in the basic mode, Performs optical signal reception processing.
  • an example configuration of an optical communication system in which the optical transmission device 10 performs wavelength multiplexing after performing mode multiplexing and the optical receiving device 30 performs wavelength separation after performing mode separation. Indicates.
  • the optical transmitter 10 includes a wavelength multiplexer 17 and a generation unit 20 (20-1, 20-2, 20-3,).
  • Each generation unit 20 includes a single light source 11, an optical branch circuit 12, an optical modulator 13 (13a, 13b,%), An optical amplifier 14 (14a, 14b,%), And a mode converter 15 (15b). , 15c,...) And the mode multiplexer 16.
  • the generation units 20 are provided in the maximum number equal to the number of wavelengths that can be multiplexed by the wavelength multiplexer 17, that is, the mode multiplexer 16 has the maximum number of wavelengths that can be multiplexed by the wavelength multiplexer 17.
  • a number equal to is provided.
  • each generation unit 20 as many optical modulators 13 and optical amplifiers 14 as the number of modes that can be multiplexed by the mode multiplexer 16 are provided.
  • the number of mode converters 15 is provided in a number equal to the number of optical modulators 13 and optical amplifiers 14 corresponding to higher-order modes (for example, LP11a mode, LP11b mode, LP02 mode, etc.).
  • the plurality of generation units 20 correspond to different single wavelengths ⁇ ( ⁇ 1 , ⁇ 2 , ⁇ 3 ,...), And generate optical signals each having a corresponding wavelength.
  • the generation units 20-1, 20-2, and 20-3 generate optical signals having wavelengths ⁇ 1 , ⁇ 2 , and ⁇ 3 , respectively.
  • the generation unit 20-1 will be mainly described.
  • the other generation units 20 may be configured in the same manner as the generation unit 20-1, except that the wavelength ⁇ of the light generated by the light source 11 is different. Is possible.
  • the generation unit 20-1 includes a single light source 11, an optical branch circuit 12, an optical modulator 13 (13a, 13b,%), An optical amplifier 14 (14a, 14b,%), And a mode converter 15 ( 15b, 15c,%) And a mode multiplexer 16.
  • the light source 11 generates and outputs fundamental mode light having a wavelength ⁇ 1 .
  • the plurality of optical modulators 13 correspond to different modes, respectively, and modulate the light output from the light source 11 independently (that is, modulate with different input signals), so that the optical signal of the basic mode is obtained. Are generated respectively.
  • the optical modulator 13a corresponds to the fundamental mode (LP01 mode)
  • the optical modulator 13b corresponds to the higher order mode (LP11a mode)
  • the optical modulator 13c corresponds to the higher order mode (LP11b mode).
  • each optical modulator 13 an optical amplifier 14 for adjusting the power of the optical signal generated by each optical modulator 13 is provided.
  • the set of the optical modulator 13 and the optical amplifier 14 corresponding to the same one mode functions as an optical transmitter (FIG. 10) corresponding to the one mode.
  • an optical attenuator may be used, or both an optical amplifier and an optical attenuator may be used.
  • the generation unit 20-1 it is also possible to provide light sources individually for a plurality of optical transmitters corresponding to different modes. However, it may be technically difficult to maintain the wavelength of light output from all of these light sources at the same wavelength. For this reason, in the present embodiment, the light output from the single light source 11 is branched by the optical branch circuit 12, and the branched (divided) light is modulated by each of the optical modulators 13. A common light source 11 is used in the vessel 13.
  • the fundamental mode optical signal (first optical signal) generated by the optical modulator 13 a corresponding to the fundamental mode and passed through the optical amplifier 14 a is input to the mode multiplexer 16. Further, the fundamental mode optical signal (second light) generated by the optical modulator 13 (13b, 13c,%) Corresponding to the higher-order mode and passed through the optical amplifier 14 (14b, 14c,). Signal) is input to the mode converter 15 (15b, 15c,).
  • the mode converter 15 converts the input optical signal having a single wavelength ⁇ 1 from the fundamental mode to a higher-order mode, and outputs the converted optical signal to the mode multiplexer 16.
  • the mode converter 15b converts the input optical signal from the basic mode to the higher order mode (LP11a mode)
  • the mode converter 15c converts the input optical signal from the basic mode to the higher order mode (LP11b). Mode).
  • the mode multiplexer 16 includes a fundamental mode optical signal having a single wavelength ⁇ 1 that has passed through the optical amplifier 14a and a single output from the mode converter 15 (15b, 15c,). A higher-order mode optical signal having wavelength ⁇ 1 is input.
  • the mode multiplexer 16 multiplexes the input optical signals (mode multiplexing) to generate a mode multiplexed signal having a single wavelength ⁇ 1 and outputs the mode multiplexed signal to the wavelength multiplexer 17.
  • wavelength multiplexer 17 To the wavelength multiplexer 17, mode multiplexed signals having different wavelengths ⁇ ( ⁇ 1 , ⁇ 2 , ⁇ 3 ,...) Output from the plurality of generation units 20 are input in parallel.
  • the wavelength multiplexer 17 generates an optical signal to be transmitted to the optical receiver 30 by multiplexing (wavelength multiplexing) the plurality of input mode multiplexed signals. Since the wavelength multiplexer 17 is processed with a mode multiplexed signal, a device having mode dependency as small as possible is employed for the wavelength multiplexer 17.
  • the mode converter 15 and the mode multiplexer 16 need only support a single wavelength.
  • the mode converter and the mode multiplexer have wavelength dependency, it may be technically difficult to cover a wide wavelength band.
  • the mode converter and the mode multiplexer need only support one specific wavelength, and there is an advantage that the design and manufacture can be facilitated.
  • the mode converter 15 and the mode multiplexer 16 are separated from each other.
  • the optical receiver 30 includes a mode separator 32, a mode converter 33 (33b, 33c,%), A wavelength separator 31 (31a, 31b, 31c,...), And a receiving unit 40 (40-1,. 40-2, 40-3, ).
  • Each receiving unit 40 includes an optical hybrid circuit 34, a light receiving element 35, a sampling processing unit 36, a MIMO processing unit 37, a carrier estimation unit 38, and a code reproduction unit 39.
  • the maximum number of wavelength separators 31 equal to the number of modes that can be separated by the mode separator 32 is provided.
  • mode converters 33 as the number of wavelength separators 31 (31b, 31c,...)
  • higher-order modes for example, LP11a mode, LP11b mode, LP02 mode, etc.
  • the receiving units 40 are provided in a number equal to the number of wavelengths that can be separated by the wavelength separator 31 at the maximum, that is, the optical hybrid circuit 34 and each of the subsequent devices are arranged at a maximum in the mode separator 32.
  • the number of separable modes are provided for the light receiving element 35, two light receiving elements corresponding to the I channel and the Q channel are provided for each mode.
  • only one MIMO processing unit 37 is provided for each receiving unit because processing is performed across all modes.
  • the mode separator 32 separates the optical signal received from the optical transmission device 10 via the optical transmission line 50 into an optical signal in a basic mode and an optical signal in a higher order mode (LP11a mode, LP11b mode, etc.). Output.
  • the fundamental mode optical signal is input to the wavelength separator 31a corresponding to the fundamental mode.
  • Each optical signal corresponding to the higher order mode is input to the corresponding mode converter 33 (33b, 33c,).
  • the mode converter 33 converts the higher-order mode optical signal output from the mode separator 32 from the higher-order mode to the basic mode and outputs the converted signal.
  • the mode converter 33b converts a high-order mode (LP11a mode) optical signal into a basic mode
  • the mode converter 33c converts a high-order mode (LP11b mode) optical signal into a basic mode.
  • the optical signal output from each mode converter 33 is input to a wavelength separator 31 (31b, 31c,...) Connected to the mode converter 33 (corresponding to a higher-order mode). Since the mode separator 32 and the mode converter 33 are wavelength multiplexed signals, devices having as little wavelength dependence as possible are employed for them.
  • the wavelength separator 31a corresponding to the fundamental mode has a plurality of fundamental mode optical signals output from the mode separator 32, each having a different single wavelength ⁇ ( ⁇ 1 , ⁇ 2 , ⁇ 3 , so Is separated into optical signals. Further, each wavelength separator 31 (31b, 31c,%) Corresponding to the higher order mode differs from the fundamental mode optical signal output from the mode converter 33 (33b, 33c, etc. The optical signals are separated into a plurality of optical signals having a single wavelength ⁇ ( ⁇ 1 , ⁇ 2 , ⁇ 3 ,).
  • the wavelength separator 31a is an example of a first wavelength separator, and the wavelength separators 31 (31b, 31c,...) Other than the wavelength separator 31a are examples of a second wavelength separator. .
  • the plurality of receiving units 40 correspond to different wavelengths ⁇ ( ⁇ 1 , ⁇ 2 , ⁇ 3 ,...), And optical signals having corresponding wavelengths are input from the wavelength separator 31.
  • optical signals having wavelengths ⁇ 1 , ⁇ 2 , and ⁇ 3 are input to the receiving units 40-1, 40-2, and 40-3, respectively.
  • Each receiving unit 40 performs a receiving process of an optical signal having a corresponding wavelength ⁇ output from the wavelength separator 31.
  • the receiving unit 40-1 will be mainly described, but the other receiving units 40 are configured in the same manner as the receiving unit 40-1, except that the wavelength of light generated by the local light source 41 is different. Is possible.
  • the fundamental mode optical signal having a single wavelength ⁇ 1 inputted from the wavelength separator 31a corresponding to the fundamental mode is inputted to the optical hybrid circuit 34 corresponding to the fundamental mode.
  • an optical hybrid circuit corresponding to a higher-order mode is inputted to a fundamental mode optical signal having a single wavelength ⁇ 1 input from a wavelength separator 31 (31b, 31c,%) Corresponding to the higher-order mode. 34 respectively.
  • the plurality of optical hybrid circuits 34 and their subsequent devices perform reception processing of the input basic mode optical signals.
  • the optical hybrid circuit 34 performs coherent detection (coherent reception) of the optical signal by mixing the input optical signal and local light.
  • each receiving unit 40 is provided with a single local light source 41.
  • the light output from the single local light source 41 is branched by the optical branch circuit 42, and the branched (divided) light is used in each optical hybrid circuit 34, whereby a plurality of optical hybrids are used.
  • a common local light source 41 is used in the circuit 34.
  • the optical signal output from the optical hybrid circuit 34 and obtained by coherent detection is converted into an electric signal by the light receiving element 35.
  • the electrical signal is converted from an analog signal to a digital signal by the sampling processing unit 36.
  • a plurality of electrical signals (digital signals) corresponding to the same wavelength and corresponding to different modes are input from the plurality of sampling processing units 36 corresponding to the different modes to the MIMO processing unit 37, respectively.
  • the MIMO processing unit 37 performs MIMO signal processing on a plurality of input digital signals to suppress crosstalk noise between modes, and obtains a signal corresponding to each mode obtained as a result, as a carrier signal. It outputs to the estimation part 38. Thereafter, carrier estimation processing is performed by the carrier estimation unit 38, and the transmission digital code is reproduced by the code reproduction unit 39. Thereafter, error correction processing or the like may be performed as necessary.
  • the optical devices in the wavelength separator 31 and the receiving unit 40 need only support the fundamental mode, and there is an advantage that the mode dependency of these optical devices does not become a problem. .
  • the number of mode separators 32 and mode converters 33, which are devices required for mode separation, is small, the introduction cost of the apparatus can be made relatively low.
  • FIG. 10 is a diagram illustrating an example of an actual device configuration of the optical receiving device 30 for coping with such a problem.
  • the optical receiver 30 includes a separator rack in which the wavelength separator 31, the mode converter 33, and the mode separator 32 are mounted, and an optical receiver rack in which a plurality of optical receivers are mounted.
  • optical receivers corresponding to all modes are mounted adjacent to the same stage in units of wavelengths (that is, for each receiving unit 40), and a common local light source 41 is provided near them. Is implemented. Further, the wavelength separator 31, the mode converter 33, and the mode separator 32 are mounted on a separator rack that is a rack independent of these optical receivers. Further, as shown in FIG. 9, the optical receiver rack and the separator rack are provided so as to realize the connection relationship between the optical receiver (the optical hybrid circuit 34, the light receiving element 35, and the subsequent electric circuit) and the wavelength separator 31. Are connected by an optical fiber. In this way, the actual device configuration of the optical receiver 30 can be realized. In the present embodiment, as shown in FIGS. 9 and 10, the mode converter 33 and the mode separator 32 are separated from each other. However, it is also possible to adopt a configuration in which these are integrated.
  • the optical transmission device 10 performs wavelength multiplexing after performing mode multiplexing, and the optical receiving device 30 performs wavelength separation after performing mode separation.
  • a system can be realized.
  • Example 4 When performing an upgrade that gradually increases the transmission capacity of the optical communication system as in the third embodiment, it is assumed that necessary devices are added in units of wavelengths or modes. In the present embodiment, a configuration example that enables such an upgrade for each of the optical transmission device 10 and the optical reception device 30 will be described. In the following, the present embodiment will be described focusing on differences from the third embodiment.
  • each generating unit 20 shown in FIG. 8 corresponds to one wavelength, and corresponds to a processing block necessary for generating an optical signal having the one wavelength. Therefore, in order to realize the upgrade of the optical transmission device 10 in units of one wavelength, the optical device may be added to the optical transmission device 10 using the generation unit 20 shown in FIG. 8 as an expansion unit.
  • the optical transmission apparatus 10 includes an optical modulator 13 corresponding to the added higher-order mode and mode multiplexing with the optical modulator 13 in order to enable addition of a higher-order mode to be transmitted.
  • An optical amplifier 14 and a mode converter 15 provided between the generator 16 and the generator 16 can be added to each generation unit 20.
  • each generating unit 20 is configured to be able to connect the optical modulator 13 to be added to the light source 11 via the optical branch circuit 12. .
  • each generation unit 20 is provided with a light source 11, an optical branch circuit 12, and a mode multiplexer 16 in advance.
  • the upgrade of the optical transmission apparatus 10 in one mode unit is performed by adding an optical device to the optical transmission apparatus 10 using the optical modulator 13, the optical amplifier 14, and the mode converter 15 as an expansion unit. It can be realized by doing.
  • An optical connector for connection may be provided in advance at a location where the optical modulator 13, the optical amplifier 14, and the mode converter 15 are connected (added) in the optical transmission device 10.
  • the upgrade of the optical transmission device 10 can be easily realized as a package extension.
  • a new generation unit 20 may be added as described above, or the number of wavelengths multiplexed by the wavelength multiplexer 17.
  • the number of generation units 20 equal to may be provided in advance.
  • the optical receiver 30 is mounted in a rack configuration as shown in FIG.
  • the optical receiver 30 includes a wavelength separator 31, a wavelength separator 31, and a mode separator 32, corresponding to the added higher-order mode, in order to enable addition of a higher-order mode to be received.
  • a mode converter 33 provided therebetween can be added.
  • the optical receiver 30 is configured such that an optical receiver (optical hybrid circuit 34, light receiving element 35, and subsequent electrical circuit) corresponding to the added higher-order mode can be added to each receiving unit 40. Further, in order to make it possible to add such an optical receiver, each receiving unit 40 of the optical receiver 30 can connect the optical receiver to be added to the local light source 41 via the optical branch circuit 42.
  • An optical connector for connection may be provided in advance at a location where the wavelength separator 31, the mode converter 33, and the optical receiver in the optical receiver 30 are connected (added). Note that the number of reception units 40 equal to the number of wavelengths separated by the wavelength separator 31 may be provided in advance, or the number of reception units 40 is increased sequentially as the number of wavelengths to be separated increases. May be.
  • the upgrade of the optical receiver 30 can be performed in stages according to the following procedure.
  • the optical receivers corresponding to the mode 1 (basic mode) are mounted on the optical receiver rack by the required number of wavelengths.
  • the separator rack is mounted with a wavelength separator 31a corresponding to mode 1 (basic mode) and a mode separator 32 that first receives an optical signal from the optical transmission line 50.
  • the MIMO processing unit 37 which is a part of the optical receiver, is an electric circuit that performs signal processing between modes in each receiving unit 40, and is not shown in FIG. It may be incorporated.
  • an optical device corresponding to mode 2 (for example, LP11a mode), which is a higher-order mode, is newly mounted in the optical receiver rack and the separator rack.
  • mode 2 for example, LP11a mode
  • optical receivers corresponding to mode 2 are newly mounted in the optical receiver rack by the number of necessary wavelengths.
  • a wavelength separator 31b corresponding to mode 2 and a mode converter 33b corresponding thereto are newly mounted on the separator rack.
  • each of the optical transmission device 10 and the optical reception device 30 can be upgraded step by step in one mode and one wavelength unit, and the equipment required for the initial introduction can be saved, and the initial introduction cost can be reduced. Reduction is possible.
  • Example 5 In the first and second embodiments, the configuration example in which mode separation is performed after the optical receiver 30 performs wavelength separation is described. However, as in the third and fourth embodiments, the optical receiver 30 performs mode separation. It is also possible to apply a configuration for performing wavelength separation later to an optical communication system. That is, the configuration shown in FIG. 8 can be adopted as the configuration of the optical receiver 30 in the optical communication systems of the first and second embodiments.
  • Example 6 In the third and fourth embodiments, a configuration example in which wavelength separation is performed after the optical receiver 30 performs mode separation has been described. However, a configuration in which mode separation is performed after the optical receiver 30 performs wavelength separation is described as optical communication. It can also be applied to the system. That is, the configuration shown in FIG. 3 can be adopted as the configuration of the optical receiver 30 in the optical communication systems of the third and fourth embodiments.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Optical Communication System (AREA)

Abstract

L'invention concerne un système de communication optique qui est configuré, dans lequel un dispositif de transmission optique exécute un multiplexage de longueurs d'onde et exécute ensuite un multiplexage de mode, et un dispositif de réception optique exécute une séparation de longueurs d'onde et exécute ultérieurement une séparation de mode. Le dispositif de transmission optique génère une pluralité de signaux optiques d'un mode de base (mode LP01), exécute un multiplexage de longueurs d'onde sur les signaux optiques, et exécute en outre un multiplexage de mode sur les signaux optiques, et génère ainsi un signal optique devant être transmis au dispositif de réception optique. Le dispositif de réception optique exécute une séparation de longueurs d'onde sur le signal optique reçu depuis le dispositif de transmission optique, et exécute en outre une séparation de mode sur le signal optique, et sépare ainsi le signal multiplexé en une pluralité de signaux optiques du mode de base, et exécute un traitement de réception des signaux optiques séparés.
PCT/JP2017/005622 2016-02-25 2017-02-16 Système de communication optique, dispositif de transmission optique et dispositif de réception optique WO2017145901A1 (fr)

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JP2016034708A JP6725995B2 (ja) 2016-02-25 2016-02-25 光通信システム
JP2016034709A JP6725996B2 (ja) 2016-02-25 2016-02-25 光通信システム及び光受信装置
JP2016-034708 2016-02-25
JP2016-034709 2016-02-25

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