WO2022201778A1 - 利得等化装置及び利得等化方法 - Google Patents
利得等化装置及び利得等化方法 Download PDFInfo
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- WO2022201778A1 WO2022201778A1 PCT/JP2022/001398 JP2022001398W WO2022201778A1 WO 2022201778 A1 WO2022201778 A1 WO 2022201778A1 JP 2022001398 W JP2022001398 W JP 2022001398W WO 2022201778 A1 WO2022201778 A1 WO 2022201778A1
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- 238000010586 diagram Methods 0.000 description 7
- 230000005540 biological transmission Effects 0.000 description 5
- 238000004891 communication Methods 0.000 description 5
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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
- H04B10/293—Signal power control
- H04B10/294—Signal power control in a multiwavelength system, e.g. gain equalisation
- H04B10/2941—Signal power control in a multiwavelength system, e.g. gain equalisation using an equalising unit, e.g. a filter
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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
- H04B10/293—Signal power control
- H04B10/294—Signal power control in a multiwavelength system, e.g. gain equalisation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
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- the present invention relates to a gain equalization device and a gain equalization method. More particularly, it relates to a gain equalization device and a gain equalization method used in a submarine communication system.
- each signal level of a WDM (Wavelength Division Multiplexing) signal (hereinafter also referred to as an optical signal) must be within a certain range.
- the loss of the optical fiber itself will increase over time as the submarine cable deteriorates over time.
- optical loss increases throughout the submarine cable system.
- the input level to the optical amplifier used in the repeater is lower than expected, and the unevenness with respect to the wavelength of the WDM signal increases, and the slope also increases. As a result, there is a problem that the required transmission quality cannot be obtained.
- Non-Patent Document 1 there is a method of correcting unevenness and inclination with respect to the wavelength of the WDM signal using an optical filter device (gain equalizer). Also, there is a method of compensating for the tilt level, for example, using an equalizer described in Patent Document 1. In addition, if the optical loss in the submarine cable system is increasing even if the gain equalizer is used, there is a method of removing the gain equalizer from the seabed and replacing the optical filter or adding a new repeater. used. Another method is to lay a wavelength selective switch (WSS) on the seabed and change the profile of the WSS to adjust the level difference of the WDM signal.
- WSS wavelength selective switch
- an object of the present invention is to provide a gain equalization device and a gain equalization method capable of improving reliability, suppressing power consumption, and suppressing an increase in optical loss.
- a gain equalization device includes: a first path having a gain equalizer that corrects the slope of the input optical signal; a second path having a through fiber that directly transmits the input optical signal; an optical switch capable of switching between a first path having the gain equalizer and a second path having the through fiber; and a control unit that controls switching of the optical switch.
- a gain equalization method comprises: performing a gain equalization process for correcting the tilt of the input optical signal on the input optical signal and outputting the gain equalization process; This is a method of outputting the input optical signal as it is without performing gain equalization processing on the input optical signal in a predetermined case.
- the present invention it is possible to provide a gain equalization device and a gain equalization method capable of improving reliability, suppressing power consumption, and suppressing an increase in optical loss.
- FIG. 1 is a block diagram showing the configuration of a gain equalization device according to a first embodiment
- FIG. FIG. 11 is a block diagram showing the configuration of a gain equalization device according to a second embodiment
- FIG. FIG. 12 is a block diagram showing the configuration of a gain equalization system according to a third embodiment
- FIG. 3 is a block diagram showing the configuration of a control device for the gain equalization device according to the first to third embodiments;
- FIG. 1 is a block diagram showing the configuration of a gain equalization device 100 according to the first embodiment.
- a gain equalization apparatus 100 includes a first path 1 having a gain equalizer, a second path 2 having a through fiber, an optical switch 10a, an optical switch 10b, and a controller 20.
- FIG. 1 For ease of explanation, the optical switches 10a and 10b are collectively referred to as the optical switch 10 as well.
- the direction of the optical signal input to the gain equalization apparatus 100 is shown in FIG. 1 as the traveling direction.
- An optical signal is input to gain equalization device 100 via optical fiber 101 and output from gain equalization device 100 via optical fiber 102 .
- the gain equalization device 100 is a device used in a submarine communication system and is laid on the seabed. Specifically, the gain equalization device 100 is inserted in at least one of a plurality of repeaters that constitute the submarine cable system. That is, the gain equalization device 100 is a device that receives an optical signal from a repeater, corrects the tilt level of the input optical signal, and outputs the tilt-level-corrected optical signal to the next repeater. .
- a repeater is a device that is laid on the bottom of the sea and amplifies an optical signal.
- a first path 1 is a path with a gain equalizer that corrects the slope of the input optical signal.
- a gain equalizer is created by calculating the attenuation characteristics of a signal based on conditions such as the wavelength of the signal, the number and characteristics of optical amplifiers (repeaters), the length of the optical fiber, and the temperature of the seabed where the submarine cable is laid. be done.
- a gain equalizer is designed to suppress the level difference of WDM signals to a predetermined range.
- a known device can be used for the gain equalizer.
- the path between the optical switch 10a and the gain equalizer in the first path 1 and the path between the gain equalizer and the optical switch 10b can be configured using optical fibers.
- the input optical signal that has passed through the first path 1 is corrected for unevenness and tilt when passing through a gain equalizer.
- a second path 2 is a path having a through fiber that transmits the input optical signal as it is.
- a through fiber is a fiber with very little optical loss. That is, the input optical signal that has passed through the second path 2 is directly output to the optical fiber 102 via the optical switch 10b without being corrected for unevenness and inclination via the through fiber.
- the optical switch 10 is a switch capable of switching between a first path 1 having a gain equalizer and a second path 2 having a through fiber.
- An optical switch is a switch that can switch the path of an optical signal as it is without converting it into an electrical signal.
- the optical switch 10 a switches paths based on the control of the control unit 20 . For example, when a control signal for switching from the first path 1 to the second path 2 is transmitted from the control unit 20 , the optical switch 10 a switches the path from the first path 1 to the second path 2 . Similarly, when a control signal for switching from the second path 2 to the first path 1 is transmitted from the control unit 20, the optical switch 10a switches the path from the second path 2 to the first path 1. good too.
- the optical switch 10 may be initially connected to the first path 1 having a gain equalizer that corrects the slope of the input optical signal.
- the optical switch 10b switches paths so that the optical fiber 102 is connected to the path connected to the optical switch 10a. Specifically, when the optical switch 10a is outputting the input optical signal from the optical fiber 101 to the first path 1, the optical switch 10b is connected to the first path 1 and the first path 1 is output to optical fiber 102 . When the optical switch 10a switches from the first path 1 to the second path 2, the optical switch 10b similarly switches from the first path 1 to the second path 2.
- FIG. Switching of the optical switches 10 a and 10 b is controlled by the control unit 20 . Thereby, the gain equalization device 100 can output the optical signal input from the optical fiber 101 to the optical fiber 102 .
- switching of the route from the first route 1 to the second route 2 by the optical switch 10 was explained, but switching of the route from the second route 2 to the first route 1 is similar. can be done.
- the control unit 20 controls switching of the optical switch 10 .
- the control unit 20 may be connected to the optical switch 10 by wire or wirelessly.
- the control unit 20 transmits to the optical switch 10 a control signal for switching the path to which the optical switch 10 is connected.
- the functions of the control unit 20 are implemented by an information processing device such as a computer or microcomputer.
- the control unit 20 may be a control circuit.
- the control unit 20 may control switching of the optical switch based on a command from the land terminal station (trunk station). For example, the control unit 20 may receive a command (signal) from a land terminal by a receiving unit (not shown) and control switching of the optical switch 10 based on the received command. Note that the land terminal station may use a measuring instrument to measure the optical loss value of the submarine cable system.
- the gain equalization apparatus 100 receives a command from an external device such as a land terminal. route 1 to the second route 2. Thereby, gain equalization apparatus 100 can suppress an increase in optical loss. Further, gain equalization apparatus 100 may switch the path from second path 2 to first path 1 based on a command from an external device such as a land terminal station. For example, when the increase in optical loss in the submarine cable system is resolved, the gain equalization apparatus 100 switches from the second path 2 to the first path 1 and uses the first path 1. , correction of the tilt of the optical signal can be performed.
- the gain equalization device 100 may also include a measuring instrument (not shown) capable of measuring the optical loss value of the submarine cable system.
- the control unit 20 may automatically switch the optical switch 10 when the increase in optical loss measured by the measuring device is equal to or greater than a predetermined threshold.
- the control unit 20 may switch the route from the first route 1 to the second route 2, for example, when the increase in optical loss measured by the measuring device is equal to or greater than a predetermined threshold. Thereby, gain equalization apparatus 100 can suppress an increase in optical loss.
- the gain equalization apparatus 100 performs gain equalization processing for correcting the inclination of the input optical signal and outputs the input optical signal. do.
- an increase in optical loss in the submarine cable system can be suppressed.
- the predetermined case is, for example, a case where a command is received from the land terminal station to the effect that the gain equalization process is not executed. Specifically, this is the case when a command relating to switching of the optical switch (for example, a command relating to switching of the route from the first route 1 to the second route 2) is received from the land terminal station.
- the predetermined case may be a case where the input optical signal satisfies a predetermined condition, or may be a case where the increase in optical loss is equal to or greater than a predetermined threshold.
- the operation of the gain equalization device 100 will be described in detail below with reference to FIG.
- the uplink and downlink have the same structure, only the direction is different. To simplify the explanation, the downlink will be explained. Let the direction of the arrow of FIG. 1 be a downward direction.
- a WDM signal (optical signal) is transmitted in the downstream direction from a land terminal station.
- An optical signal is input from the optical fiber 101 to the gain equalization device 100 .
- the optical switch 10a determines whether the input optical signal passes through the first path 1 or the second path 2.
- FIG. The initial setting may be set to pass through the first path 1 with a gain equalizer that corrects the slope of the input optical signal.
- the control unit 20 receives a command from the land terminal station and controls switching of the optical switch 10 .
- the optical switch 10 a switches the route from the first route 1 to the second route 2 under the control of the control unit 20 .
- the optical switch 10b also switches the route from the first route 1 to the second route 2 in the same manner.
- the optical signal passes through the second path 2, is input to the optical switch 10b, and is output to the optical fiber 102.
- the gain equalization apparatus 100 switches the path to the second path 2 having the through fiber when the optical loss of the submarine cable system increases. An increase in optical loss can be suppressed.
- the optical loss of a gain equalizer is about 4 dB, but the loss of a through fiber is extremely small. Therefore, the gain equalization apparatus 100 can compensate for a loss increase of about 4 dB by switching from the first path 1 having the gain equalizer to the second path 2 having the through fiber. An increase in optical loss in a communication system can be suppressed.
- the gain equalization device 100 is composed only of the first path 1, the second path 2, the optical switch 10, and the control unit 20, it is composed of devices with sufficiently high reliability for submarine communication systems. It is possible. Therefore, in order to repair the gain equalization device 100, it is possible to reduce the cost of lifting it from the seabed and re-laying it. Moreover, since the gain equalization apparatus 100 can simplify the configuration of the optical circuit and the electric circuit, it is possible to reduce the size and power consumption of the gain equalization apparatus 100 .
- the gain equalization device 100 according to the present embodiment can improve reliability, suppress power consumption, and suppress an increase in optical loss.
- FIG. 2 is a block diagram showing the configuration of a gain equalization device 200 according to the second embodiment.
- the gain equalization device 200 includes a first path 1 having a gain equalizer, a second path 2 having a through fiber, a third path 3 having a gain equalizer, an optical switch 11a, an optical switch 11b, a control A unit 20 is provided.
- An optical fiber 101 and an optical fiber 102 are connected to the gain equalization device 200 .
- the optical switch 11a and the optical switch 11b are collectively called the optical switch 11.
- FIG. Configurations similar to those of the gain equalization apparatus 100 according to the first embodiment are denoted by similar reference numerals. Further, detailed descriptions of the same contents as in the first embodiment will be omitted as appropriate. Differences from the first embodiment will be mainly described below.
- a third path 3 is a path with a gain equalizer that corrects the tilt of the input optical signal.
- the gain equalizer of the third path 3 may be identical to the gain equalizer of the first path 1 .
- the gain equalizer 200 can similarly correct the tilt of the input optical signal by switching to the third path 3 even if the gain equalizer in the first path 1 fails.
- the gain equalizer of the third path 3 and the gain equalizer of the first path 1 may be different gain equalizers. That is, the gain equalizer of the third path 3 may be able to correct a different slope level than the gain equalizer of the first path 1 .
- the gain equalization apparatus 200 can perform necessary tilt level correction by switching paths.
- the gain equalizers of the first path 1 and the third path 3 are assumed to be the same.
- the optical switch 11 is an optical switch capable of switching between the first path 1, the second path 2, and the third path 3.
- the optical switch 11 switches paths based on the control of the control unit 20, as in the first embodiment.
- the gain equalizer 200 can switch paths from the first path 1 to the third path 3 when the optical loss of the submarine cable system is increasing.
- the gain equalization apparatus 200 for example, when the gain equalizer in the first path 1 fails or malfunctions and the optical signal of the optical signal in the first path 1 increases, the path By switching to the third path 3, it is possible to continuously correct the tilt of the optical signal while suppressing an increase in optical loss in the submarine cable system.
- the gain equalizer 200 can switch the path from the first path 1 to the second path 2 when the optical loss of the submarine cable system is increasing. Thereby, the gain equalization device 200 can suppress an increase in optical loss in the submarine cable system. Note that the gain equalization device 200 may switch the path from the third path 3 to the second path 2 when the optical loss of the submarine cable system is increasing.
- the gain equalization device 200 can suppress an increase in optical loss in the submarine cable system by switching between the first path 1, the second path 2, and the third path 3. .
- the operation of the gain equalization device 200 will be described using FIG.
- the uplink and downlink have the same structure, only the direction is different. To simplify the explanation, the downlink will be explained. Let the direction of the arrow of FIG. 2 be a downward direction. A WDM signal is transmitted from a land terminal station in the down direction.
- An optical signal is input from the optical fiber 101 to the gain equalization device 200 .
- the optical switch 11a determines whether the input optical signal passes through the first path 1, the second path 2, or the third path 3. .
- the optical switch 11 may be connected to the first path 1 or the third path 3 with a gain equalizer that corrects the slope of the input optical signal. It is assumed below that the first route 1 is selected as an initial setting.
- the control unit 20 receives a command from the land terminal station and controls switching of the optical switch 11 .
- the optical switch 11 a switches the route from the first route 1 to the second route 2 or the third route 3 under the control of the control unit 20 .
- the optical switch 11b also switches the route from the first route 1 to the second route 2 or the third route 3, like the optical switch 11a.
- the optical signal passes through the second path 2 or the third path 3 and is output to the optical fiber 102 via the optical switch 11b.
- the gain equalizer 200 is designed to allow the WDM signal to pass through the second path 2 having the through fiber when the optical fiber 101 deteriorates over time or is repaired, resulting in cable interruption and an increase in optical loss.
- the optical switch 11 may be switched to .
- the gain equalization device 200 for example, when the optical loss is increased by the gain equalizer in the first path 1, the optical switch 11 to pass through the second path 2 or the third path 3 can be switched. As described above, the gain equalization device 200 can suppress an increase in optical loss in the submarine cable system by switching between the first path 1, the second path 2, and the third path 3. .
- the gain equalization device 200 has a simple configuration of the first path 1, the second path 2, the third path 3, the optical switch 11, and the control section 20, and can be miniaturized. Further, the miniaturization eliminates the need for a complicated control mechanism, thereby reducing power consumption. In addition, since the gain equalization device 200 can be configured with a simple structure, the possibility of failure or malfunction is reduced, and reliability can be improved.
- a new path having a gain equalizer may be added to the gain equalization apparatus 200 .
- FIG. 3 is a block diagram showing the configuration of a gain equalization system 1000 according to the third embodiment.
- Gain equalization system 1000 includes gain equalizer 200 and gain equalizer 300 . Since the gain equalization device 200 has the same configuration as the gain equalization device 200 according to the second embodiment, the same reference numerals are given and detailed description thereof will be omitted as appropriate. Also, the following description will focus on differences from the second embodiment.
- Gain equalization device 100 may be used instead of gain equalization device 200 .
- the gain equalization device 300 is arranged at a land terminal station.
- Gain equalization device 300 is a gain equalization device comprising a fourth path 4 having a gain equalizer that corrects the slope of the input optical signal.
- the gain equalizer included in gain equalizer 300 may be the same as or different from the gain equalizer in first path 1 or third path 3 .
- the optical signal output from the optical fiber 102 is input to the gain equalization device 300 .
- the optical signal output from the optical fiber 102 may pass through a repeater or another gain equalization device before being input to the gain equalization device 300 .
- the gain equalizer in the fourth path 4 of the gain equalizer 300 reduces the slope of the optical signal output from the second path 2 of the gain equalizer 200 when the second path 2 of the gain equalizer 200 is used. correct.
- the gain equalization device 200 uses the second path 2
- the increase in optical loss is suppressed compared to the first path 1 and the third path 3, but the optical fiber 101 still There is optical loss in the optical signal input from the , and it may be necessary to correct the tilt level.
- the gain equalization device 300 By correcting the tilt of the optical signal output from the gain equalization device 200 by the gain equalization device 300, transmission quality can be ensured.
- gain equalization apparatus 300 may further include a path having a through fiber and an optical switch, similar to gain equalization apparatus 100 and gain equalization apparatus 200 . If the first path 1 or the third path 3 of the gain equalizer 200 is used, there is no need to correct for the tilt, so the gain equalizer 300 can reduce the input optical signal from the optical fiber 102 to may be output to a path having a through fiber.
- the gain equalization apparatus 200 laid on the seabed is provided with the fourth path 4 having the gain equalizer at the land terminal station. Therefore, even if the tilt of the optical signal is not corrected, the tilt of the optical signal can be corrected at the land terminal station. This makes it possible to ensure the transmission quality of optical signals in the submarine cable system.
- Gain equalization apparatus 100 , gain equalization apparatus 200 , and gain equalization device 300 shown in FIG. 4 have processor 111 and memory 112 .
- the processor 111 may be, for example, a microprocessor, an MPU (Micro Processing Unit), or a CPU (Central Processing Unit).
- Processor 111 may include multiple processors.
- Memory 112 is comprised of a combination of volatile and non-volatile memory. Memory 112 may include storage located remotely from processor 111 . In this case, processor 111 may access memory 112 via an input/output interface (not shown).
- control device in the above-described embodiments is configured by hardware or software, or both, and may be configured from one piece of hardware or software, or may be configured from multiple pieces of hardware or software.
- Each function of the control device in the above-described embodiments may be realized by a computer.
- a program for performing the operations in the embodiment may be stored in the memory 112 and each function may be realized by executing the program stored in the memory 112 by the processor 111 .
- Non-transitory computer readable media include various types of tangible storage media.
- Examples of non-transitory computer-readable media include magnetic recording media (e.g., flexible discs, magnetic tapes, hard disk drives), magneto-optical recording media (e.g., magneto-optical discs), CD-ROMs (Read Only Memory), CD-Rs, CD-R/W, semiconductor memory (eg, mask ROM, PROM (Programmable ROM), EPROM (Erasable PROM), flash ROM, RAM (random access memory)).
- the program may also be delivered to the computer by various types of transitory computer readable media. Examples of transitory computer-readable media include electrical signals, optical signals, and electromagnetic waves. Transitory computer-readable media can deliver the program to the computer via wired channels, such as wires and optical fibers, or wireless channels.
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Abstract
Description
他の方法としては波長選択スイッチデバイス(WSS;wavelength selective switch)を海底に敷設し、WSSのプロファイルを変更して、WDM信号のレベル差を調整する方法がある。
また、波長選択スイッチデバイスついては、波長選択スイッチデバイス自体の信頼性が十分でなく、機器内で波長選択スイッチを冗長する必要がある。そのため、波長選択スイッチを用いた利得等化装置は回路が複雑になり、大型で消費電力も大きいという問題点があった。
入力光信号の傾斜を補正する利得等化器を有する第1の経路と、
入力光信号をそのまま透過するスルーファイバを有する第2の経路と、
前記利得等化器を有する第1の経路と、前記スルーファイバを有する第2の経路と、を切り替え可能な光スイッチと、
前記光スイッチの切り替えを制御する制御部と、を備える。
入力光信号に対して、前記入力光信号の傾斜を補正する利得等化処理を実行して出力し、
所定の場合に、前記入力光信号に対する利得等化処理を実行せずにそのまま出力する方法である。
以下、図面を参照して本発明の実施の形態について説明する。ただし、本発明が以下の実施形態に限定される訳ではない。また、説明を明確にするため、以下の記載及び図面は、適宜、簡略化されている。
また、利得等化装置100は、陸上端局などの外部からのコマンドに基づいて、第2の経路2から第1の経路1へ経路を切り替えてもよい。利得等化装置100は、例えば、海底ケーブルシステムの光損失の増加が解消された場合には、第2の経路2から第1の経路1へ経路を切り替えて、第1の経路1を用いることで、光信号の傾斜の補正を行うことができる。
なお、所定の場合とは、例えば、陸上端局から利得等化処理を実行しない旨のコマンドを受信した場合である。具体的には、陸上端局からの光スイッチの切り替えに関するコマンド(例えば、第1の経路1から第2の経路2への経路の切り替えに関するコマンド)を受信した場合である。また、所定の場合とは入力光信号が所定の条件を充足する場合であってもよく、光損失の増加が所定の閾値以上である場合などであってもよい。
図2は、第2の実施形態に係る利得等化装置200の構成を示すブロック図である。利得等化装置200は、利得等化器を有する第1の経路1、スルーファイバを有する第2の経路2、利得等化器を有する第3の経路3、光スイッチ11a、光スイッチ11b、制御部20を備える。利得等化装置200には、光ファイバ101、光ファイバ102が接続されている。なお、光スイッチ11a、光スイッチ11bを合わせて、光スイッチ11とも呼ぶ。第1の実施形態に係る利得等化装置100と同様な構成については、同様の符号を付している。また、第1の実施形態と同様の内容については、適宜詳細な説明を省略する。以下では第1の実施形態との違いを中心に説明する。
また、第3の経路3の利得等化器と、第1の経路1の利得等化器とは、異なる利得等化器であってもよい。つまり、第3の経路3の利得等化器は、第1の経路1の利得等化器とは異なる傾斜レベルを補正可能であってもよい。これにより、利得等化装置200は、経路を切り替えることで、必要な傾斜レベルの補正を行うことができる。以下、説明を簡単にするため、第1の経路1及び第3の経路3の利得等化器は同一のものとして説明する。
なお、利得等化装置200は、海底ケーブルシステムの光損失が増加しているとき、第3の経路3から第2の経路2に経路を切り替えてもよい。
以上のように、利得等化装置200は、第1の経路1、第2の経路2、及び、第3の経路3を切り替えることで、海底ケーブルシステムの光損失の増加を抑制することができる。
図3は、第3の実施形態に係る利得等化システム1000の構成を示すブロック図である。利得等化システム1000は、利得等化装置200と、利得等化装置300とを備える。利得等化装置200は、第2の実施形態に係る利得等化装置200と構成が同様であるため、同様の符号を付し、適宜詳細な説明を省略する。また、以下では第2の実施形態との違いを中心に説明する。なお、利得等化装置200に代わって、利得等化装置100を用いてもよい。
利得等化装置300の第4の経路4における利得等化器は、利得等化装置200の第2の経路2が使用されている場合に、第2の経路2から出力された光信号の傾斜を補正する。
第2の経路 2
第3の経路 3
第4の経路 4
光スイッチ 10、10a、10b、11、11a、11b
制御部 20
利得等化装置 100、200、300
光ファイバ 101
光ファイバ 102
プロセッサ 111
メモリ 112
利得等化システム 1000
Claims (6)
- 入力光信号の傾斜を補正する利得等化器を有する第1の経路と、
入力光信号をそのまま透過するスルーファイバを有する第2の経路と、
前記利得等化器を有する第1の経路と、前記スルーファイバを有する第2の経路と、を切り替え可能な光スイッチと、
前記光スイッチの切り替えを制御する制御手段と、を備える、
利得等化装置。 - 入力光信号の傾斜を補正する利得等化器を有する第3の経路をさらに備え、
前記光スイッチは、前記第1の経路、前記第2の経路、及び、前記第3の経路を切り替え可能である、
請求項1に記載の利得等化装置。 - 前記制御手段は、陸上端局からのコマンドに基づき、前記光スイッチの切り替えを制御する、
請求項1または2に記載の利得等化装置。 - 海底に敷設される、
請求項1~3のいずれか1項に記載の利得等化装置。 - 入力光信号の傾斜を補正する利得等化器を有する第4の経路を、陸上端局に備え、
前記第4の経路における前記利得等化器は、前記第2の経路が使用されている場合に、前記第2の経路から出力された光信号の傾斜を補正する、
請求項1~4のいずれか1項に記載の利得等化装置。 - 入力光信号に対して、前記入力光信号の傾斜を補正する利得等化処理を実行して出力し、
所定の場合に、前記入力光信号に対する利得等化処理を実行せずにそのまま出力する、
利得等化方法。
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US18/283,106 US20240171282A1 (en) | 2021-03-24 | 2022-01-17 | Gain equalization apparatus and method for equalizing gain |
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Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH11224967A (ja) * | 1998-02-04 | 1999-08-17 | Fujitsu Ltd | 利得等化のための方法並びに該方法の実施に使用する装置及びシステム |
JP2001094534A (ja) * | 1999-09-20 | 2001-04-06 | Kdd Submarine Cable Systems Inc | 光送信装置 |
JP2008154123A (ja) * | 2006-12-20 | 2008-07-03 | Hitachi Communication Technologies Ltd | 分散補償器、光伝送システム及び光伝送方法 |
WO2019176894A1 (ja) * | 2018-03-16 | 2019-09-19 | 日本電気株式会社 | 可変イコライザ及び可変イコライザの制御方法 |
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Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH11224967A (ja) * | 1998-02-04 | 1999-08-17 | Fujitsu Ltd | 利得等化のための方法並びに該方法の実施に使用する装置及びシステム |
JP2001094534A (ja) * | 1999-09-20 | 2001-04-06 | Kdd Submarine Cable Systems Inc | 光送信装置 |
JP2008154123A (ja) * | 2006-12-20 | 2008-07-03 | Hitachi Communication Technologies Ltd | 分散補償器、光伝送システム及び光伝送方法 |
WO2019176894A1 (ja) * | 2018-03-16 | 2019-09-19 | 日本電気株式会社 | 可変イコライザ及び可変イコライザの制御方法 |
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