WO2023105658A1 - 双方向光増幅器、双方向光増幅装置及び双方向光増幅方法 - Google Patents

双方向光増幅器、双方向光増幅装置及び双方向光増幅方法 Download PDF

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WO2023105658A1
WO2023105658A1 PCT/JP2021/045036 JP2021045036W WO2023105658A1 WO 2023105658 A1 WO2023105658 A1 WO 2023105658A1 JP 2021045036 W JP2021045036 W JP 2021045036W WO 2023105658 A1 WO2023105658 A1 WO 2023105658A1
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optical
light
input
core
fifo
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English (en)
French (fr)
Japanese (ja)
Inventor
晃平 細川
恵一 松本
タヤンディエ ドゥ ガボリ エマニュエル ル
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NEC Corp
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NEC Corp
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Priority to JP2023565758A priority patent/JP7683736B2/ja
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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
    • H04B10/29—Repeaters
    • H04B10/291—Repeaters in which processing or amplification is carried out without conversion of the main signal from optical form
    • H04B10/297—Bidirectional amplification

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  • the present invention relates to a bidirectional optical amplifier and a bidirectional optical amplification method.
  • Each of the optical amplifiers described in Patent Documents 1 to 3 has a function of amplifying bidirectional optical signals by simultaneously operating two optical amplifiers.
  • two optical amplifiers are always operating. That is, even when bidirectional transmission is performed by temporally switching the transmission direction of the optical signal, the optical amplifier in the direction in which the optical signal is not transmitted is operating. Therefore, the bidirectional optical amplifiers described in Patent Documents 1 to 3 have a problem of large power consumption when bidirectional transmission is performed by temporally switching the transmission direction of the optical signal.
  • the present invention provides a technique for realizing a bidirectional optical amplifier that consumes less power and is capable of amplifying bidirectional light when performing bidirectional transmission by temporally switching the transmission direction of an optical signal. intended to
  • the bidirectional optical amplifier of the present invention is a first input/output port; a second input/output port; first optical amplification means for amplifying light in a first direction propagating along a first optical path connecting the first input/output port and the second input/output port; light in a second direction that propagates through a second optical path that connects the first input/output port and the second input/output port and is different from the first optical path a second optical amplification means for amplifying and arranged in parallel with the first optical amplification means; optical path configuration means for configuring at least one of the first optical path and the second optical path; pumping light supplying means for supplying pumping light to either the first optical amplifying means or the second optical amplifying means; Prepare.
  • the bidirectional optical amplification method of the present invention comprises: arranging the first optical amplification means and the second optical amplification means in parallel, amplifying light in a first direction propagating in a first optical path connecting a first input/output port and a second input/output port by the first optical amplification means; light in a second direction that propagates through a second optical path that connects the first input/output port and the second input/output port and is different from the first optical path , amplified by the second optical amplification means, configuring at least one of the first optical path and the second optical path; supplying pumping light to either the first optical amplification means or the second optical amplification means; Bi-directional optical amplification method.
  • the present invention provides a bidirectional optical amplifier that consumes less power and can amplify bidirectional light when performing bidirectional transmission by temporally switching the transmission direction of an optical signal.
  • FIG. 1 is a block diagram showing a configuration example of a bidirectional optical amplifier according to a first embodiment
  • FIG. FIG. 4 is a block diagram showing a first modification of the bidirectional optical amplifier of the first embodiment
  • FIG. FIG. 4 is a block diagram showing a second modification of the bidirectional optical amplifier of the first embodiment
  • FIG. FIG. 4 is a block diagram showing a configuration example of a bidirectional optical amplifier according to a second embodiment
  • FIG. 11 is a block diagram showing a modification of the bidirectional optical amplifier of the second embodiment
  • FIG. FIG. 11 is a block diagram showing a configuration example of a bidirectional optical amplifier according to a third embodiment
  • FIG. 11 is a block diagram showing a configuration example of a bidirectional optical amplifier according to a fourth embodiment
  • FIG. 11 is a block diagram showing a configuration example of a bidirectional optical amplifier according to a fifth embodiment;
  • FIG. 11 is a block diagram showing a configuration example of a bidirectional optical amplifier according to a sixth embodiment;
  • FIG. 11 is a block diagram showing a modified example of the bidirectional optical amplifier of the sixth embodiment;
  • FIG. 11 is a block diagram showing a configuration example of a bidirectional optical amplifier according to a seventh embodiment;
  • FIG. 14 is a block diagram showing a configuration example of a bidirectional optical amplifier included in the bidirectional optical amplifier of the seventh embodiment;
  • FIG. 20 is a block diagram showing a configuration example of a bidirectional optical amplifier according to an eighth embodiment;
  • FIG. 1 is a block diagram showing a configuration example of a bidirectional optical amplifier 100 according to the first embodiment of the present invention.
  • the bidirectional optical amplifier 100 includes input/output ports 101 and 102 , optical path configuration units 111 and 112 , optical amplifiers 121 and 122 , and a pumping light supply unit 131 .
  • the input/output ports 101 and 102 are input/output interfaces for light passing through the bidirectional optical amplifier 100 and external optical fibers.
  • the input/output ports 101 and 102 are connection points with single core fibers (SCF) by optical connectors or splicing, for example.
  • SCF single core fibers
  • the direction from the input/output port 101 to the input/output port 102 is described as the first direction
  • the direction from the input/output port 102 to the input/output port 101 is described as the second direction.
  • light that is input to the input/output port 101 and output from the input/output port 102 is "light in the first direction"
  • light traveling in the opposite direction to the light in the first direction is "light in the second direction”. It is light.
  • the optical path configuration units 111 and 112 configure at least one of the first optical path and the second optical path. That is, the optical path configuration units 111 and 112 connect the input/output ports 101 and 102 by at least one of a first optical path via the optical amplifier 121 and a second optical path via the optical amplifier 122 .
  • the optical amplifiers 121 and 122 are optical fiber amplifiers.
  • Optical amplifier 121 amplifies light in a first direction and optical amplifier 122 amplifies light in a second direction.
  • Optical amplifier 121 and optical amplifier 122 are arranged in parallel between input/output ports 101 and 102 . That is, the optical amplifier 121 amplifies the light in the first direction propagating along the first optical path.
  • the first optical path connects the input/output port 101 and the input/output port 102 .
  • the optical amplifier 122 is arranged in parallel with the optical amplifier 121 and amplifies light in a second direction propagating along a second optical path that is different from the first optical path.
  • the excitation light supply unit 131 includes an excitation light source including, for example, a 980 nm wavelength laser diode.
  • the pumping light supply unit 131 supplies pumping light to either the optical amplifier 121 or the optical amplifier 122 .
  • the pumping light supply unit 131 includes a first pumping light source that supplies pumping light to the optical amplifier 121 and a second pumping light source that supplies pumping light to the optical amplifier 122. Only the pumping light source connected to the optical amplifier to be operated is provided. may be operated.
  • the pumping light supply unit 131 includes one pumping light source and a 1 ⁇ 2 optical switch that switches the output destination of the pumping light output from the pumping light source to either the optical amplifier 121 or the optical amplifier 122, and is operated. The optical switch may be controlled so that pumping light is supplied only to the optical amplifier.
  • the pumping light supply unit 131 pumps the optical amplifier 121 or 122 so that the input light is amplified when the first light or the second light needs to be amplified in the bidirectional optical amplifier 100. provide light.
  • the pumping light supply unit 131 may supply the pumping light to the optical amplifier 121 during a predetermined period and the pumping light to the optical amplifier 122 during other periods.
  • the period is the period during which the first light is input to the bidirectional optical amplifier 100 .
  • the pumping light supply unit 131 may switch the optical amplifier that supplies the pumping light every predetermined time. In this case, the time is the time when the light input to the bidirectional optical amplifier 100 switches between the first light and the second light.
  • the period or the time to switch the optical amplifier supplying the pumping light may be held as data by the pumping light supply unit. Further, the excitation light supply unit 131 may set the period or time based on information that the excitation light supply unit 131 acquires from the outside.
  • a general configuration for supplying pumping light generated by a pumping light source to an optical fiber amplifier is well known, so detailed description thereof will be omitted.
  • the bidirectional optical amplifier 100 described above has the effect of reducing power consumption and enabling bidirectional light amplification when performing bidirectional transmission by temporally switching the transmission direction of an optical signal.
  • the reason for this is that the pumping light supply unit 131 supplies pumping light to either one of the optical amplifiers 121 and 122, so that the power of the pumping light to be supplied to optical amplifiers that do not require an amplification function can be reduced. is.
  • the bidirectional optical amplifier 100 of the first embodiment can also be described as follows. That is, the bidirectional optical amplifier (100) has a first input/output port (101), a second input/output port (102), a first optical amplification means (121), and a second optical amplification means. (122), optical path configuration means (111, 112), and excitation light supply means (131).
  • the reference numerals of FIG. 1 are described in parentheses.
  • the first optical amplifying means amplifies light propagating in the first direction in the first optical path.
  • the first optical path is an optical path connecting the first input/output port and the second input/output port.
  • the second optical amplification means amplifies the light in the second direction propagating on the second optical path, and is arranged in parallel with the first optical amplification means.
  • the second optical path is an optical path connecting the first input/output port and the second input/output port, and is an optical path different from the first optical path.
  • the optical path configuring means configures at least one of the first optical path and the second optical path.
  • the pumping light supply means supplies pumping light to either the first optical amplification means or the second optical amplification means.
  • the bidirectional optical amplifier 100 of the first embodiment consumes less power and can amplify bidirectional light when performing bidirectional transmission by temporally switching the transmission direction of an optical signal.
  • a bi-directional optical amplifier can be realized.
  • FIG. 2 is a block diagram showing a configuration example of the bidirectional optical amplifier 100A.
  • a bidirectional optical amplifier 100A is a first modification of the bidirectional optical amplifier 100.
  • FIG. 1 is a block diagram showing a configuration example of the bidirectional optical amplifier 100A.
  • the bidirectional optical amplifier 100A differs from the bidirectional optical amplifier 100 in that it includes optical attenuators 141 and 142 .
  • the optical attenuator 141 reduces the power of light in the first direction input to the optical amplifier 121 .
  • the optical attenuator 142 reduces the power of light in the second direction that is input to the optical amplifier 122 .
  • the pumping light supply unit 131 reduces the attenuation of the optical attenuation unit 141 when the pumping light is supplied to the optical amplifier 121, and reduces the attenuation of the optical attenuation unit 141 when the pumping light is not supplied to the optical amplifier 121.
  • the pumping light supply unit 131 reduces the attenuation of the light attenuation unit 142 when the pumping light is supplied to the optical amplifier 122, and reduces the attenuation of the light attenuation unit 142 when the pumping light is not supplied to the optical amplifier 122. Increase attenuation.
  • Such control can reduce the adverse effect on the optical amplifier 122 caused by the reflected light from the input side of the optical amplifier 121 entering the output side of the optical amplifier 122 via the optical path forming section 111 .
  • the adverse effect on the optical amplifier 121 due to the reflected light on the input side of the optical amplifier 122 entering the output side of the optical amplifier 121 via the optical path forming section 112 can be reduced.
  • variable optical attenuator or an optical shutter can be used as the optical attenuation units 141 and 142 .
  • the variable optical attenuator increases or decreases the attenuation of light input to the optical amplifiers 121 and 122 according to instructions from the pumping light supply section 131 .
  • the optical shutter connects or blocks the optical path on the input side of the optical amplifier 121 or 122 according to an instruction from the excitation light supply unit 131 .
  • Variable optical attenuators and optical shutters are one form of optical attenuation means. The power of the reflected light generated by these optical amplifiers can be reduced by increasing the amount of attenuation by the variable optical attenuator or by blocking the optical path by the optical shutter.
  • FIG. 3 is a block diagram showing a configuration example of the bidirectional optical amplifier 100B.
  • a bidirectional optical amplifier 100B is a second modification of the bidirectional optical amplifier 100.
  • FIG. 3 is a block diagram showing a configuration example of the bidirectional optical amplifier 100B.
  • a bidirectional optical amplifier 100B is a second modification of the bidirectional optical amplifier 100.
  • the bidirectional optical amplifier 100B differs from the bidirectional optical amplifier 100 in that it includes optical monitoring units 151 and 152 .
  • the light monitoring unit 151 monitors the light in the first direction and outputs information indicating the state of the light in the first direction to the excitation light supply unit 131 .
  • the light monitoring unit 152 monitors light in the second direction and outputs information indicating the state of the light in the second direction to the excitation light supply unit 131 .
  • the excitation light supply unit 131 acquires these pieces of information from the light monitoring units 151 and 152 . Based on the acquired information, the pumping light supply unit 131 determines to which of the optical amplifiers 121 and 122 the pumping light is supplied.
  • the optical monitoring units 151 and 152 are one form of optical monitoring means.
  • the light monitoring means outputs information indicating whether the light in the first direction and the light in the second direction are in a predetermined state to the excitation light supply means.
  • the light monitoring unit 151 outputs to the excitation light supply unit 131 information indicating whether light in the first direction exists.
  • the light monitoring unit 152 outputs to the excitation light supply unit 131 information indicating whether light in the second direction is present.
  • the excitation light supply unit 131 acquires these pieces of information from the light monitoring units 151 and 152 .
  • the pumping light supply unit 131 supplies the pumping light only to the optical amplifier 121 when only the light in the first direction exists, and supplies the pumping light only to the optical amplifier 122 when only the light in the second direction exists. to provide excitation light.
  • the bidirectional optical amplifier 100B having such a configuration, pumping light is supplied only to the optical amplifier in which light to be transmitted exists. Therefore, even if the times at which the light in the first direction and the light in the second direction are transmitted are unknown, the bidirectional optical amplifier 100B itself can transmit the light in the first direction and the light in the second direction. Presence can be detected. Further, the bidirectional optical amplifier 100B has the effect of being able to control the supply of pumping light to the optical amplifiers 121 and 122 so that the transmitted light is amplified.
  • the optical monitoring units 151 and 152 may include optical couplers and photoelectric conversion elements.
  • the optical coupler included in the optical monitoring unit 151 splits the light in the first direction input to the optical amplifier 121 and inputs it to the photoelectric conversion element.
  • the light monitoring unit 151 monitors whether the power of light in the first direction is equal to or greater than a predetermined threshold according to the output of the photoelectric conversion element, and outputs the monitoring result to the excitation light supply unit 131 .
  • the light monitoring section 152 monitors the power of light in the second direction and outputs the monitoring result to the pumping light supply section 131 .
  • the pumping light supply unit 131 supplies the pumping light to either the optical amplifier 121 or the optical amplifier 122 so that only the light in the direction in which the power first becomes equal to or greater than the threshold is amplified. Further, the excitation light supply unit 131 may stop supplying the excitation light when the power of the light in the direction in which the excitation light is supplied is less than a predetermined threshold value.
  • the operation of the excitation light supply section 131 is determined according to the requirements of the system in which these lights are transmitted.
  • the pumping light supply unit 131 may supply the pumping light only to an optical amplifier that amplifies the light in which predetermined information is detected first, out of the light in the first direction and the light in the second direction.
  • the pumping light supply unit 131 causes the optical amplifiers 121 and 122 to Neither need be supplied with excitation light.
  • the pumping light supply section 131 supplies the pumping light to neither of the optical amplifiers 121 and 122. .
  • the light monitoring units 151 and 152 may determine whether or not there is light in the first direction or light in the second direction based on information other than the power of light. For example, if the light in the first direction contains a predetermined preamble, the light monitoring unit 151 may determine that the first light is being transmitted.
  • a preamble is, for example, a change in the power of light in a first direction according to a specific pattern. Here, the specific pattern is added at or during transmission of the light in the first direction.
  • the light monitor 152 may similarly monitor the preamble of light in the second direction.
  • the configurations of the bidirectional optical amplifiers 100, 100A and 100B described above are not mutually exclusive.
  • a configuration of a bidirectional optical amplifier including both optical attenuation units 141 and 142 and optical monitoring units 151 and 152 is also acceptable.
  • the optical attenuation section 141 is arranged between the input side of the optical amplifier 121 and the optical monitoring section 151
  • the optical attenuation section 142 is arranged between the input side of the optical amplifier 122 and the optical monitoring section 152.
  • the light monitoring units 151 and 152 can monitor light in the first direction and light in the second direction regardless of the operating states of the light attenuation units 141 and 142 .
  • FIG. 4 is a block diagram showing a configuration example of a bidirectional optical amplifier 200 according to the second embodiment of the present invention.
  • the bidirectional optical amplifier 200 is constructed by using the optical circulators 113 and 114, respectively, for the optical path forming units 111 and 112 of the bidirectional optical amplifier 100 described in FIG.
  • the optical circulators 113 and 114 have ports 1 to 3, and connect only the directions from port 1 to port 2, from port 2 to port 3, and from port 3 to port 1 with low loss.
  • a first optical path through the optical amplifier 121 and a second optical path through the optical amplifier 122 are configured between the input/output port 101 and the input/output port 102. .
  • FIG. 5 is a block diagram showing a configuration example of the bidirectional optical amplifier 200A.
  • the bidirectional optical amplifier 200A replaces the optical circulator 113 and the optical circulator 114 of the bidirectional optical amplifier 100A described with reference to FIG. 4 with optical switches 115 and 116, respectively.
  • Optical switches 115 and 116 are 1 ⁇ 2 optical switches, and connect only between port 1 and port 2 or between port 1 and port 3 with low loss.
  • the excitation light supply section 131 controls the optical switches 115 and 116 so as to configure the first optical path or the second optical path. That is, by using the optical switches 115 and 116, either the first optical path passing through the optical amplifier 121 or the second optical path passing through the optical amplifier 122 can be connected to the input/output port 101 or the input/output port 102. configured between
  • the bidirectional optical amplifiers 200 and 200A having these configurations like the bidirectional optical amplifier 100, have low power consumption and low power consumption when performing bidirectional transmission by temporally switching the transmission direction of an optical signal. of light can be amplified.
  • the bidirectional optical amplifiers 200 and 200A may include the optical attenuation units 141 and 142 described with reference to FIG. 2, and may include the optical monitoring units 151 and 152 described with reference to FIG.
  • FIG. 6 is a block diagram showing a configuration example of a bidirectional optical amplifier 300 according to the third embodiment of the present invention.
  • the bidirectional optical amplifier 300 includes pumping light sources 161 and 162, optical multiplexers 163 and 164, FIFOs 171 and 172, and a 2-core EDF 170 compared to the bidirectional optical amplifier 100 of FIG.
  • Bidirectional optical amplifier 300 may also include optical filters 165 and 166 .
  • Optical filters 165 and 166 are optical filters that block ASE (Amplified Spontaneous Emission, amplified spontaneous emission) output from the 2-core EDF 170 in the first direction and the second direction, respectively.
  • a FIFO Fluorescence-In/Fan-Out
  • SCF Single Core Fiber
  • MCF Multi Core Fiber
  • the FIFO connects multiple SCF cores and one or more MCF cores for each core.
  • the FIFO 171 connects the SCF core connected to the optical multiplexer 163 and one end of one of the two cores of the 2-core EDF 170 .
  • the FIFO 171 also connects the core of the SCF connected to the optical filter 166 and the other end of the two cores of the 2-core EDF 170 .
  • the FIFO 172 connects the core of the SCF connected to the optical multiplexer 164 and the other end of one of the two cores of the 2-core EDF 170 .
  • the FIFO 172 also connects the core of the SCF connected to the optical filter 165 and the other end of the two cores of the 2-core EDF 170 .
  • the 2-core EDF 170 is an optical amplification medium composed of MCF including two cores (first core and second core) in one EDF (Erbium-Doped Fiber).
  • the excitation light source 161 is a light source that generates excitation light that excites the first core of the two-core EDF 170
  • the excitation light source 162 is a light source that generates excitation light that excites the second core of the two-core EDF 170 .
  • the excitation light sources 161 and 162 may each include a laser diode with a wavelength band of 980 nm. Pumping light sources 161 and 162 operate such that pumping light is supplied to either of the two cores of the two-core EDF.
  • the optical multiplexers 163 and 164 are wavelength multiplexing devices that multiplex the excitation light, the light in the first direction, and the light in the second direction, respectively.
  • Pumping light generated by the pumping light source 161 or 162 is combined with the first core and the second core of the two-core EDF 170 by the optical multiplexer 163 or 164, respectively.
  • the light in the first direction passes through the input/output port 101, the optical circulator 113, the optical multiplexer 163, the FIFO 171, the first core of the 2-core EDF 170, the FIFO 172, the optical filter 165, and the optical circulator 114. to proceed to the input/output port 102 .
  • the light in the second direction passes through the input/output port 102, the optical circulator 114, the optical multiplexer 164, the FIFO 172, the second core of the 2-core EDF 170, the FIFO 171, the optical filter 166, and the optical circulator 113 to the input/output port. Go to 101.
  • the optical multiplexers 163 and 164, FIFOs 171 and 172, and 2-core EDF 170 included in the bidirectional optical amplifier 300 function as the optical amplifiers 121 and 122 of the bidirectional optical amplifier 100 in FIG.
  • the pumping light sources 161 and 162 also have the function of the pumping light supply section 131 of the bidirectional optical amplifier 100 .
  • the procedure of the excitation light supply unit 131 described in the first embodiment can be applied to switch the supply destination of the excitation light by the excitation light sources 161 and 162 .
  • the pumping light sources 161 and 162 generate pumping light so that the pumping light is supplied to either the first core or the second core of the two-core EDF 170. . Therefore, the bidirectional optical amplifier 300 can amplify bidirectional light with low power consumption when bidirectional transmission is performed by temporally switching the transmission direction of an optical signal. Moreover, the bidirectional optical amplifier 300 uses a 2-core EDF, so that the EDFs of the optical amplifiers 121 and 122 of the bidirectional optical amplifier 100 can be configured with a single EDF. Therefore, the bidirectional optical amplifier 300 has the additional effect of being able to be made smaller than the bidirectional optical amplifier 100 .
  • FIG. 7 is a block diagram showing a configuration example of a bidirectional optical amplifier 400 according to the fourth embodiment of the invention.
  • the bidirectional optical amplifier 400 differs in that it includes a pumping light source 167 and an optical switch 168 instead of the pumping light sources 161 and 162 provided in the bidirectional optical amplifier 300 .
  • the excitation light source 167 is a light source that generates a single excitation light
  • the optical switch 168 outputs the excitation light generated by the excitation light source 167 to the optical multiplexer 163 or the optical multiplexer 164 .
  • the optical switch 168 switches the optical path so that the pumping light is output to the optical multiplexer 163 when the two-core EDF 170 amplifies the light in the first direction.
  • the optical switch 168 switches the optical path of the pumping light so that the pumping light is output to the optical multiplexer 164 when the two-core EDF 170 amplifies the light in the second direction.
  • the procedure described in the first embodiment can be applied to the procedure for determining switching of the optical path of the excitation light by the optical switch 168 .
  • the bidirectional optical amplifier 400 having such a configuration has the effect of reducing the number of pumping light sources in addition to the effect of the bidirectional optical amplifier 300.
  • FIG. 8 is a block diagram showing a configuration example of a bidirectional optical amplifier 500 according to the fifth embodiment of the present invention.
  • the bidirectional optical amplifier 500 is different in that it has a pumping light source 173 and an optical coupler 174 instead of the pumping light sources 161 and 162 and the optical multiplexers 163 and 164 provided in the bidirectional optical amplifier 300 .
  • the excitation light source 173 is a light source that generates a single excitation light.
  • the optical coupler 174 injects the excitation light generated by the excitation light source 167 into the cladding region of the two-core EDF 170 .
  • FIFOs 171 and 172, 2-core EDF 170 and optical coupler 174 function as optical amplifiers 121 and 122 of bi-directional optical amplifier 100 of FIG.
  • the pumping light source 173 also functions as the pumping light supply section 131 of the bidirectional optical amplifier 100 .
  • the bi-directional optical amplifier 500 only needs to supply the power of pumping light for light in the direction to be amplified to the cladding region of the two-core EDF 170 . Therefore, like the bidirectional optical amplifiers described in the first to fourth embodiments, the bidirectional optical amplifier 500 consumes less power when performing bidirectional transmission by temporally switching the transmission direction of an optical signal. It is small and bi-directional optical amplification is possible. Furthermore, the bidirectional optical amplifier 500 uses a technique called "cladding pumping," in which pumping light is injected into the cladding region. Since a relatively inexpensive multimode laser can be used as a pumping light source for cladding pumping, the cost of the bidirectional optical amplifier 500 can be reduced.
  • MCF transmission system a bidirectional optical amplifier applicable to an optical transmission system using MCF as an optical transmission line
  • MCF transmission system When performing long-distance transmission using MCF, crosstalk of optical signals may occur between adjacent cores. Crosstalk occurring between MCF cores is relatively large between cores in which optical signals propagate in the same direction. It is also known that crosstalk between cores in which optical signals propagate in opposite directions is smaller than crosstalk between cores in which optical signals propagate in the same direction.
  • the directions of optical signals are opposite to each other between adjacent cores and Directions of those optical signals may be reversed at each time. In this way, by reversing the transmission direction of the optical signal between adjacent cores in the MCF, bidirectional transmission can be realized while suppressing crosstalk.
  • the direction of an optical signal propagating through one core at a certain time is only one direction. Therefore, the optical fiber amplifier that amplifies the optical signal propagating through the core does not require the function of amplifying the optical signal in both directions at the same time, and has the function of amplifying only the direction of the optical signal propagating through the core at that time. All you have to do is
  • the bidirectional optical amplifiers illustrated in FIGS. 1-8 in the first to fifth embodiments can be applied to such an MCF transmission system.
  • FIG. 9 is a block diagram showing a configuration example of a bidirectional optical amplifier 600 according to the sixth embodiment of the present invention.
  • the bidirectional optical amplifier 600 comprises two bidirectional optical amplifiers 601 and 602 , MCFs 611 and 612 and FIFOs 613 and 614 .
  • Bidirectional optical amplifiers 601 and 602 are arranged in parallel between FIFOs 613 and 614 .
  • Both MCFs 611 and 612 are MCFs with two cores.
  • the light transmitted through each core of the MCF 611 is time-divisionally transmitted bidirectionally in opposite directions.
  • light transmitted through each core is time-divisionally transmitted bidirectionally in opposite directions.
  • FIFOs 613 and 614 are FIFOs capable of connecting two core MCFs and two SCFs.
  • FIFO 613 connects two cores (core 1 and core 2) of MCF 611 to one end of bi-directional optical amplifiers 601 and 602, respectively.
  • FIFO 614 connects the two cores (core 1 and core 2) of MCF 612 with respective SCFs at the other end of bi-directional optical amplifiers 601 and 602, respectively.
  • the bidirectional optical amplifiers 601 and 602 each have any configuration of the bidirectional optical amplifiers described in FIGS. Therefore, description of the configuration of the bidirectional optical amplifiers 601 and 602 is omitted.
  • the SCF side of the FIFO 613 is connected to the SCF input/output ports 101 of the bidirectional optical amplifiers 601 and 602, respectively, and the SCF side of the FIFO 614 is connected to the SCF input/output ports 102 of the bidirectional optical amplifiers 601 and 602, respectively. be done.
  • the bidirectional optical amplifiers 601 and 602 included in the bidirectional optical amplifier 600 have the respective effects of the bidirectional optical amplifiers described in the embodiments of FIGS. You can enjoy the effect of an optical amplifier. Furthermore, the bidirectional optical amplifier 600 can amplify light propagating through each core with low power consumption while suppressing crosstalk between cores in an MCF transmission system. The reason for this is that in each of the MCF 611 and MCF 612, the light transmitted through the two cores is time-divisionally transmitted bidirectionally in opposite directions, and pumping light is supplied to the optical amplifier only when the light is transmitted. Because it is done.
  • FIG. 10 is a block diagram showing a configuration example of a bidirectional optical amplifier 600A.
  • a bidirectional optical amplifier 600A is a modification of the bidirectional optical amplifier 600 described with reference to FIG.
  • the bidirectional optical amplifier 600 includes N bidirectional optical amplifiers 601-60N, MCFs 611A and 612A, and FIFOs 613A and 614A.
  • Bidirectional optical amplifiers 601-60N are arranged in parallel between FIFOs 613A and 614A.
  • N is an integer of 2 or more.
  • the bidirectional optical amplifier 600A is obtained by increasing the parallel number of the bidirectional optical amplifiers 601 and 602 included in the bidirectional optical amplifier 600 from 2 to N.
  • the MCFs 611A and 612A are both N-core MCFs having N cores
  • the FIFOs 613A and 614A are FIFOs capable of connecting the N-core MCFs and N SCFs.
  • FIFO 613A connects between the N cores (core 1-core N) of MCF 611A and respective SCFs at one end of bi-directional optical amplifiers 601-60N, respectively.
  • FIFOs 614A connect between the N cores (Core 1-Core N) of MCF 612A and respective SCFs at the other ends of bi-directional optical amplifiers 601-60N, respectively.
  • Each of the bidirectional optical amplifiers 601-60N has any configuration of the bidirectional optical amplifiers described in the first to fifth embodiments.
  • core 1 of MCF 611A is connected to core 1 of MCF 612A via bidirectional optical amplifier 601 .
  • Core 2-Core N of MCF 611A are similarly connected to Core 2-Core N of MCF 612A via bi-directional optical amplifiers 602-60N, respectively.
  • the bidirectional optical amplifier 600A having such a configuration can independently amplify light propagating through each core in an MCF transmission system using N-core MCFs.
  • the bidirectional optical amplifiers 601-60N included in the bidirectional optical amplifier 600A have the respective effects of the bidirectional optical amplifiers described in the first to fifth embodiments. Therefore, bidirectional optical amplifying device 600A can enjoy the effects of these optical amplifiers in the same way as bidirectional optical amplifying device 600 does.
  • FIG. 11 is a block diagram showing a configuration example of a bidirectional optical amplifier 700 according to the seventh embodiment of the present invention.
  • Bidirectional optical amplifier 700 comprises bidirectional optical amplifier 701 , MCFs 711 and 712 , and FIFOs 713 and 714 .
  • Bidirectional optical amplifier 701 is placed in parallel between FIFOs 713 and 714 .
  • Bi-directional optical amplifier 701 will be described later.
  • FIFOs 713 and 714 are FIFOs capable of connecting two core MCFs and two SCFs.
  • FIFO 713 connects two cores (core 1 and core 2) of MCF 711 to one end of bidirectional optical amplifier 701, respectively.
  • FIFO 714 connects the two cores (core 1 and core 2) of MCF 712 to the other end of bidirectional optical amplifier 701, respectively.
  • FIG. 12 is a block diagram showing a configuration example of the bidirectional optical amplifier 701.
  • FIG. Bi-directional optical amplifier 701 amplifies light propagating between core 1 of MCF 711 and core 1 of MCF 712 and light propagating between core 2 of MCF 711 and core 2 of MCF 712 .
  • Core 1 and core 2 of MCF 711 are connected to input/output ports 771 and 773 via FIFO 713, respectively.
  • Core 1 and core 2 of MCF 712 are connected to input/output ports 772 and 774 via FIFO 714, respectively.
  • Optical circulators 721 and 723 and FIFO 731 guide each of the two first directions of light traveling from FIFO 713 to FIFO 714 (i.e., light traveling from left to right in FIG. 12) to different cores of two-core EDF 761.
  • the optical coupler 743 injects the excitation light generated by the excitation light source 741 into the cladding region of the 2-core EDF 761 . This amplifies the light in the first direction.
  • the optical circulators 722 and 724 and the FIFO 732 are connected so that the two first-direction lights amplified by the respective cores of the two-core EDF 761 are output to the FIFO 714 .
  • Optical circulators 722 and 724 and FIFO 734 are connected to guide each of the two second direction lights traveling from FIFO 714 to FIFO 713 to respective cores of two-core EDF 762 .
  • An optical coupler 744 injects excitation light generated by an excitation light source 742 into the cladding region of the two-core EDF 762 . This amplifies the light in the second direction.
  • the optical circulators 721 and 723 and the FIFO 733 are connected so that the two lights in the second direction amplified by each core of the 2-core EDF 762 are output to the FIFO 713 .
  • Optical filters 751-754 are wavelength filters for removing ASE generated in the two-core EDFs 761 and 762, and are provided as required.
  • the input/output ports 771 and 773 have the function of the input/output port 101 of the bidirectional optical amplifier 100 of FIG.
  • Input/output ports 772 and 774 function as input/output ports 102 of bidirectional optical amplifier 100 .
  • FIFOs 731 - 734 , 2-core EDFs 761 and 762 , and optical couplers 743 and 744 function as optical amplifiers 121 and 122 of bidirectional optical amplifier 100 .
  • the pumping light sources 741 and 742 also function as the pumping light supply unit 131 of the bidirectional optical amplifier 100 . That is, the excitation light sources 741 and 742 supply excitation light to either one of the 2-core EDFs 761 and 762 . As a result, it is possible to reduce the power of the excitation light supplied to the two-core EDF in the direction in which light is not input.
  • the 2-core EDF 761 amplifies light in the first direction only
  • the 2-core EDF 762 amplifies light in the second direction only.
  • Pumping light is injected from the input side of the light to be amplified in the two-core EDFs 761 and 762 . That is, both the two-core EDFs 761 and 762 always amplify light by forward pumping.
  • the two-core EDF 170 illustrated in FIG. is backward excitation.
  • the 2-core EDFs 761 and 762 always amplify the light in the same direction, so there is an effect that the difference in the amplification characteristics of the EDFs is less likely to occur for each direction of the amplified light.
  • two-core EDFs 761 and 762 may also be used for backward pumping.
  • the lengths of the 2-core EDF 761 and 2-core EDF 762 are sufficiently short compared to the length of the transmission path of the MCF transmission system, so the influence of crosstalk in each of the 2-core EDF 761 and 2-core EDF 762 can be ignored.
  • the bi-directional optical amplifier 701 and the bi-directional optical amplifying apparatus 700 having the same have the effect that the two-core EDFs 761 and 762 amplify light in the same pumping direction, so that the difference in amplification characteristics for each light direction is less likely to occur. Play.
  • the bidirectional optical amplifier 500 it is also possible to reduce the cost of the bidirectional optical amplifier 701 and the bidirectional optical amplifier 700 by cladding pumping.
  • the bidirectional optical amplifier 700 propagates through each core in an MCF transmission system that performs bidirectional transmission by temporally switching the transmission direction of optical signals for each core. Light can be amplified with low power consumption while suppressing crosstalk.
  • the reason for this is that in each of the MCF 711 and MCF 712, the light transmitted through the two cores is time-divisionally transmitted bidirectionally in opposite directions, and pumping light is supplied to the optical amplifier only when the light is transmitted. Because it is done.
  • FIG. 13 is a block diagram showing a configuration example of a bidirectional optical amplifying device 800 according to the eighth embodiment of the present invention.
  • the bidirectional optical amplifier 800 has a function in which N bidirectional optical amplifiers 300 described in FIG. 6 are arranged in parallel.
  • N is an integer of 2 or more. That is, FIFO 831 connects core 1-core N of N-core MCF 811 with N SCFs of N optical circulators 841-84N, respectively.
  • FIFO 834 also connects core 1-core N of N-core MCF 812 with N SCFs of N optical circulators 851-85N, respectively.
  • the 2N-core EDF 820 is a multi-core fiber EDF with 2N cores.
  • the 2N-core EDF 820 has the same function as N 2-core EDFs 170 of the bidirectional optical amplifier 300 arranged in parallel.
  • FIFO 832 connects 2N cores connected by SCFs with optical circulators 841-84N to one end of each core of 2N core EDF 820.
  • FIG. FIFO 833 also connects the 2N cores connected to optical circulators 851-85N by SCFs with the other end of each core of 2N core EDF 820.
  • the core 1 of the N-core MCF 811 is connected to the core 1 of the N-core MCF 812 via the optical circulator 841 , the first core of the 2N-core EDF, and the optical circulator 851 .
  • the basic configuration and operation of a bidirectional optical amplifier using an optical circulator and a multi-core EDF are the same as those of the bidirectional optical amplifier 300, so a detailed description of the bidirectional optical amplifier 800 will be omitted.
  • N sets of configurations similar to the pump light source 161 and the optical multiplexer 163 of the bidirectional optical amplifier 300 are arranged between the optical circulators 841-84N and the FIFO 832 in the first direction. Be prepared.
  • N sets of configurations similar to the pumping light source 162 and the optical multiplexer 164 are provided between the optical circulators 851 to 85N and the FIFO 833 .
  • description of these excitation light sources and the optical multiplexer is omitted.
  • the bidirectional optical amplifier device 800 configured in this manner has a configuration in which N bidirectional optical amplifiers 300 are arranged in parallel. Therefore, the bidirectional optical amplifier 800 can enjoy the effects of the bidirectional optical amplifier 300 .
  • the bidirectional optical amplifier 800 can then connect to the N-core MCFs 811 and 812 and amplify light transmitted by the MCF transmission system using the N-core MCFs. Also, by using the 2N-core EDF 820, the size of the EDF can be reduced compared to a configuration in which N 2-core EDFs are arranged in parallel.
  • (Appendix 1) a first input/output port; a second input/output port; first optical amplification means for amplifying light in a first direction propagating along a first optical path connecting the first input/output port and the second input/output port; light in a second direction that propagates through a second optical path that connects the first input/output port and the second input/output port and is different from the first optical path a second optical amplification means for amplifying and arranged in parallel with the first optical amplification means; optical path configuration means for configuring at least one of the first optical path and the second optical path; pumping light supplying means for supplying pumping light to either the first optical amplifying means or the second optical amplifying means; A bi-directional optical amplifier.
  • the optical path configuring means is The light in the first direction input to the first input/output port is output to the first optical amplifying means, and the light in the second direction output from the second optical amplifying means is output.
  • a first optical circulator that outputs to the first input/output port;
  • the light in the second direction input to the second input/output port is output to the second optical amplifying means, and the light in the first direction output from the first optical amplifying means is output.
  • a second optical circulator that outputs to the second input/output port;
  • the optical path configuring means is outputting the light in the first direction input to the first input/output port to the first optical amplifying means, or the light in the second direction output from the second optical amplifying means; to the first input/output port; and outputting the light in the second direction input to the second input/output port to the second optical amplifying means, or the light in the first direction output from the first optical amplifying means to the second input/output port; and
  • Appendix 4 Any one of appendices 1 to 3, wherein the pumping light supply means supplies the pumping light generated by a single pumping light source to either one of the first optical amplification means and the second optical amplification means 2.
  • a bi-directional optical amplifier according to any one of claims 1 to 4, each comprising optical attenuation means for reducing the power of the light.
  • the excitation light supply means is supplying the pumping light only to the first optical amplifying means when only the light in the first direction is in the predetermined state; when only the light in the second direction is in the predetermined state, supplying the pumping light only to the second optical amplifying means;
  • a bidirectional optical amplifier according to any one of Appendices 1 to 5.
  • Appendix 7 a first FIFO; a second FIFO; a multi-core EDF comprising a first core and a second core; the first optical amplification means and the second optical amplification means respectively use the first core and the second core of the multi-core EDF as optical amplification media; one end and the other end of the multi-core EDF are connected to the optical path configuring means via the first FIFO and the second FIFO, respectively;
  • a bidirectional optical amplifier according to any one of Appendices 1 to 6.
  • Appendix 10 a third FIFO, a fourth FIFO, N bi-directional optical amplifiers according to any one of Appendices 1 to 8, N is an integer of 2 or more,
  • the N bidirectional optical amplifiers are arranged in parallel between one end of the third FIFO and one end of the fourth FIFO;
  • the other end of the third FIFO and the other end of the fourth FIFO are respectively connected to a first multicore fiber and a second multicore fiber, Bi-directional optical amplifier.
  • the first optical amplification means comprises a third FIFO, a fourth FIFO and a first two-core EDF
  • the second optical amplifying means comprises a fifth FIFO, a sixth FIFO and a second two-core EDF
  • one end and the other end of the first two-core EDF are connected to the third FIFO and the fourth FIFO, respectively
  • one end and the other end of the second two-core EDF are connected to the fifth FIFO and the sixth FIFO, respectively
  • the third and fourth FIFOs are arranged to form the first optical path
  • said fifth and sixth FIFOs arranged to form said second optical path
  • a bidirectional optical amplifier according to any one of Appendices 1 to 6.
  • the function of the excitation light supply unit 131 may be programmed.
  • the bidirectional optical amplifier of each embodiment may implement a part or all of the functions of the excitation light supply section 131 by executing a program by a computer.
  • Computers are, for example, logic devices, central processing units, and digital signal processing units.
  • the program may also be recorded on a computer-readable, fixed, non-temporary recording medium.
  • a recording medium is, for example, a flexible disk, a fixed magnetic disk, or a nonvolatile semiconductor memory.
  • the program may be distributed over a network.

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WO2025062579A1 (ja) * 2023-09-21 2025-03-27 日本電信電話株式会社 コア切替装置および光増幅システム

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JPH11112436A (ja) * 1997-09-30 1999-04-23 Nippon Telegr & Teleph Corp <Ntt> 双方向利得分割型光増幅器
JP2000209151A (ja) * 1999-01-18 2000-07-28 Furukawa Electric Co Ltd:The 光増幅中継装置及び複数心双方向光伝送システム
JP2001203644A (ja) * 2000-01-18 2001-07-27 Fujitsu Ltd 光増幅器および光増幅方法
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JPH08304860A (ja) * 1995-05-11 1996-11-22 Kokusai Denshin Denwa Co Ltd <Kdd> 光ファイバ増幅器
JPH11112436A (ja) * 1997-09-30 1999-04-23 Nippon Telegr & Teleph Corp <Ntt> 双方向利得分割型光増幅器
JP2000209151A (ja) * 1999-01-18 2000-07-28 Furukawa Electric Co Ltd:The 光増幅中継装置及び複数心双方向光伝送システム
JP2001203644A (ja) * 2000-01-18 2001-07-27 Fujitsu Ltd 光増幅器および光増幅方法
JP2021163814A (ja) * 2020-03-31 2021-10-11 古河電気工業株式会社 光ファイバ増幅器および光通信システム

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Publication number Priority date Publication date Assignee Title
WO2025062579A1 (ja) * 2023-09-21 2025-03-27 日本電信電話株式会社 コア切替装置および光増幅システム

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