Submarine device, submarine cable system, and control method and control program for submarine device

Abstract

Provided are a submarine device (10) that can be operated stably, a submarine cable system (1), a method for controlling the submarine device (10), and a non-transitory computer-readable medium. The submarine device (10) is disposed on the seabed and is provided with a laser element (111) that generates an optical signal for use in responding to a remote control signal received via a cable (CB) from a land device (90) disposed on land, and a temperature adjustment unit (120) that adjusts the temperature of the laser element (111).

Description

[Technical Field]

[0001] The present disclosure relates to a submarine device, a submarine cable system, a method for controlling a submarine device, and a non-transitory computer-readable medium. [Background technology]

[0002] Patent Document 1 describes a method of supplying power from a constant current supply device to submarine devices that make up a submarine cable system. The constant current supply device in Patent Document 1 uses a constant current supply method that supplies power to the submarine devices by controlling the drive current flowing through n sets of drive elements.

[0003] Patent Document 2 describes that power is supplied from a driving voltage generating means to submarine devices that make up a submarine cable system. The driving voltage generating means in Patent Document 2 generates a voltage in response to a current flowing through a group of n Zener diodes.

[0004] Patent Document 3 describes that power is supplied from a power switching unit to submarine devices that make up a submarine cable system. The power switching unit in Patent Document 3 switches the power supply to a temporary power supply unit that is temporarily energized during use in order to prevent the occurrence of failures. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] International Publication No. 2017 / 033437 [Patent Document 2] International Publication No. 2017 / 159648 [Patent Document 3] International Publication No. 2021 / 124789 Summary of the Invention [Problem to be solved by the invention]

[0006] A submarine cable system includes land-based equipment and submarine equipment laid on the seabed, and can have a total length of more than 10,000 km. Because it is difficult to transmit a constant voltage from the power supply equipment in the land-based equipment to the submarine equipment, submarine cable systems use a power supply method that supplies current (called the system current) through a power cable. Inside the submarine equipment, typically a submarine repeater, a power supply circuit is installed that obtains a constant voltage from the system current. The power supply circuit includes, for example, a Zener diode. The power supply circuit obtains the constant voltage by utilizing the breakdown voltage caused by the Zener effect when a voltage is applied between the cathode and anode of the Zener diode. The product of this constant voltage and the system current corresponds to the power consumption within the submarine equipment. Therefore, the power supply circuit is configured with n Zener diodes connected in cascade, depending on the power consumption.

[0007] Recently, submarine cable systems have been required to be equipped with remote control and response functions using optical signals from terminal equipment at land-based equipment to submarine equipment. Therefore, a light source is required on the submarine equipment side, and for example, a laser module may be used in the submarine equipment. Laser modules are susceptible to wear and tear due to temperature changes and long-term continuous use, which may lead to failure. When used in submarine equipment that is required to operate for 25 years, there is a risk of failure. Therefore, it is desirable to ensure stable operation of submarine equipment, including laser modules, for a long period of time.

[0008] In view of the above-mentioned problems, an object of the present disclosure is to provide a submarine device, a submarine cable system, a control method for a submarine device, and a non-transitory computer-readable medium that can operate stably. [Means for solving the problem]

[0009] An undersea device according to one aspect of the present disclosure is located on the seabed and comprises a laser element that generates an optical signal used to respond to a remote control signal received via a cable from an onshore device located on land, and a temperature adjustment means for adjusting the temperature of the laser element.

[0010] A submarine cable system according to one embodiment of the present disclosure comprises a land device located on land, a submarine device located on the seabed, and a cable connecting the land device and the submarine device, wherein the submarine device has a laser element that generates an optical signal used when responding to a remote control signal received from the land device via the cable, and a temperature adjustment means that adjusts the temperature of the laser element.

[0011] A method for controlling an undersea device according to one aspect of the present disclosure includes a laser element for generating an optical signal used in responding to a remote control signal received via a cable from an onshore device located on land, and a temperature adjustment means for adjusting the temperature of the laser element, the method comprising: a temperature adjustment step for causing the temperature adjustment means to adjust the temperature of the laser element of an undersea device; and an optical signal generation step for causing the laser element to generate the optical signal.

[0012] A non-transitory computer-readable medium according to one aspect of the present disclosure stores a control program for an undersea device that causes a computer to execute the following steps of: a temperature adjustment step of causing the temperature adjustment means to adjust the temperature of the laser element of the undersea device, the temperature adjustment means adjusting the temperature of the laser element, and an optical signal generation step of causing the laser element to generate the optical signal, the control program comprising: a laser element that generates an optical signal used in responding to a remote control signal received via a cable from an onshore device located on land; and a temperature adjustment means that adjusts the temperature of the laser element. [Effects of the Invention]

[0013] The present disclosure makes it possible to provide a submarine device, a submarine cable system, a control method for a submarine device, and a non-transitory computer-readable medium that can operate stably. [Brief explanation of the drawings]

[0014] [Figure 1] 1 is a configuration diagram illustrating a submarine cable system according to a first embodiment. [Figure 2] 1 is a block diagram illustrating an example of an undersea device according to a first embodiment. [Figure 3]3 is a flowchart illustrating a control method for the submarine device according to the first embodiment. FIG. [Figure 4] FIG. 10 is a circuit diagram illustrating an example of an undersea device according to a second embodiment. [Figure 5] FIG. 10 is a flowchart illustrating a control method for a submarine device according to a second embodiment. [Figure 6] FIG. 10 is a circuit diagram illustrating an example of an undersea device according to a third embodiment. [Figure 7] FIG. 10 is a flowchart illustrating a control method for an undersea device according to a third embodiment. [Figure 8] FIG. 10 is a circuit diagram illustrating an example of an undersea device according to a fourth embodiment. [Figure 9] FIG. 10 is a flowchart illustrating a control method for an undersea device according to a fourth embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0015] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. In each drawing, the same or corresponding elements are designated by the same reference numerals, and for clarity of explanation, duplicate explanations will be omitted as necessary.

[0016] (Embodiment 1) A submarine cable system and submarine devices according to embodiment 1 will be described. Fig. 1 is a configuration diagram illustrating a submarine cable system according to embodiment 1. As shown in Fig. 1, the submarine cable system 1 comprises a land device 90, a submarine device 10, and a cable CB. Below, the configurations of the <land device>, <cable>, and <submarine device> will be described, followed by a <method for controlling the submarine device>.

[0017] <Land-based equipment> The land equipment 90 is equipment located on land. The land equipment 90 is connected to the submarine equipment 10 by a cable CB. The land equipment 90 may be connected to another land equipment 90 by a cable CB. The land equipment 90 includes, for example, a power supply equipment and a land terminal equipment. Note that the land equipment 90 may include equipment other than a power supply equipment and a land terminal equipment, as long as it is equipment located on land.

[0018] <Cable> Cable CB connects land units 90 to submarine units 10, between land units 90, and between submarine units 10. Cable CB may be located on land or under the sea. Cable CB carries optical signals including remote control signals. Cable CB may also carry system current to power submarine units 10.

[0019] <Undersea equipment> The submarine device 10 is a device located on the seabed. The submarine device 10 is connected to a land device 90 via a cable CB. The submarine device 10 may be connected to another submarine device 10 via a cable CB. The submarine device 10 includes, for example, a submarine repeater. Note that the submarine device 10 may include devices other than a submarine repeater as long as they are devices located on the seabed.

[0020] FIG. 2 is a block diagram illustrating an example of an undersea device according to the first embodiment. As shown in FIG. 2, the undersea device 10 includes a laser module 110 and a temperature adjustment unit 120. The laser module 110 and the temperature adjustment unit 120 function as a laser light emitting means and a temperature adjustment means. The laser module 110 includes a laser element 111. The laser element 111 functions as an optical signal generating means. The laser element 111 generates an optical signal used when responding to a remote control signal received from an onshore device 90 via a cable CB. The laser element 111 is, for example, a laser diode. In this case, the laser element 111 emits light when a current flows in the forward direction. Note that the laser element 111 is not limited to a laser diode as long as it generates an optical signal.

[0021] The wavelength of the laser light generated by the laser element 111 changes depending on the temperature of the laser element 111. The wavelength of the laser light can be set to a predetermined wavelength by setting the laser element 111 to a predetermined temperature. The temperature adjustment unit 120 adjusts the temperature of the laser element 111.

[0022] <Submarine device control method> Fig. 3 is a flowchart illustrating a control method for the submarine device 10 according to embodiment 1. As shown in Fig. 3, the control method for the submarine device 10 includes a temperature adjustment step (step S11) and an optical signal generation step (step S12).

[0023] First, as shown in step S11, in a temperature adjustment step, the temperature of the laser element 111 is adjusted by the temperature adjustment unit 120. Next, as shown in step S12, in an optical signal generation step, an optical signal is generated by the laser element 111. The optical signal is to be used when responding to a remote control signal.

[0024] According to this embodiment, the temperature of the laser element 111 can be adjusted, so that an optical signal can be generated using laser light having a desired wavelength. This improves the communication status of the optical signal. Furthermore, temperature adjustment by the temperature adjustment unit 120 can suppress temperature changes in the laser element 111. This suppresses wear on the laser element 111, allowing the submarine cable system 1 and the submarine unit 10 to operate stably for a long period of time.

[0025] (Embodiment 2) Next, a submarine device according to a second embodiment will be described. FIG. 4 is a circuit diagram illustrating the submarine device according to the second embodiment. As shown in FIG. 4, the submarine device 20 of this embodiment includes a laser module 110, a temperature adjustment unit 120, a constant voltage generation unit 130, a remote control reception unit 140, and a switch SW1. The laser module 110, the temperature adjustment unit 120, the constant voltage generation unit 130, the remote control reception unit 140, and the switch SW1 function as a laser light emission means, a temperature adjustment means, a constant voltage generation means, a remote control reception means, and a switch means, respectively. The laser module 110, the temperature adjustment unit 120, and the remote control reception unit 140 are connected in parallel with the constant voltage generation unit 130. Below, the configurations of the <laser module>, <temperature adjustment unit>, <constant voltage generation unit>, and <remote control reception unit> will be described first, followed by a <method for controlling the submarine device>.

[0026] <Laser module> The laser module 110 has a laser element 111, a cooling / heating unit 112, and a temperature measuring unit 113. The laser element 111, the cooling / heating unit 112, and the temperature measuring unit 113 function as an optical signal generating means, a cooling / heating means, and a temperature measuring means, respectively.

[0027] The laser element 111 has an anode 111a and a cathode 111b. The laser element 111 is connected to the constant voltage generator 130 via a switch SW1 so that a constant voltage is applied. Specifically, the anode 111a of the laser element 111 is connected to the cathode 130a of the constant voltage generator 130 via the switch SW1. The cathode 111b of the laser element 111 is connected to the anode 130b of the constant voltage generator 130.

[0028] The cooling / heating unit 112 cools and heats the laser element 111 under the control of the temperature adjustment unit 120. For example, the cooling / heating unit 112 controls the laser element 111 depending on the value of the current flowing from the temperature adjustment unit 120. 111to a predetermined set temperature. The temperature measuring unit 113 measures the temperature of the laser element 111. The temperature measuring unit 113 is, for example, a thermistor. In this case, the temperature measuring unit 113 measures the temperature of the laser element 111 from the resistance value of the thermistor. Note that the temperature measuring unit 113 is not limited to a thermistor as long as it can measure the temperature of the laser element 111. The temperature measuring unit 113 outputs the measured temperature of the laser element 111 to the temperature adjusting unit 120.

[0029] <Temperature adjustment section> When adjusting the temperature of laser element 111, temperature adjustment unit 120 controls cooling / heating unit 112 so that the temperature of laser element 111 measured by temperature measurement unit 113 becomes a predetermined set temperature. For example, temperature adjustment unit 120 refers to the resistance value of a thermistor and applies a current to cooling / heating unit 112 so that the temperature of laser element 111 becomes the predetermined set temperature. The predetermined set temperature is a temperature at which laser element 111 generates laser light of a predetermined wavelength.

[0030] The temperature adjustment unit 120 has one terminal 120a and the other terminal 120b. The anode 111a is connected to the one terminal 120a. The cathode 111b is connected to the other terminal 120b. The temperature adjustment unit 120 is connected to the constant voltage generation unit 130 via a switch SW1 so that a constant voltage is applied. Specifically, the one terminal 120a of the temperature adjustment unit 120 is connected to the cathode 130a of the constant voltage generation unit 130 via the switch SW1. The other terminal 120b of the temperature adjustment unit 120 is connected to the anode 130b of the constant voltage generation unit 130.

[0031] <Constant voltage generation section> The constant voltage generating unit 130 generates a constant voltage. The constant voltage generating unit 130 generates the constant voltage, for example, by a constant current power supply method. That is, the land device 90 includes a power feeding device, and the cable CB includes a power feeding cable. The constant voltage generating unit 130 generates the constant voltage by a constant current power supply method that uses a system current fed from the power feeding device via the power feeding cable.

[0032] The constant voltage generating unit 130 includes, for example, multiple (n) Zener diodes ZD1, ZD2, ..., ZDn arranged in cascade. The multiple Zener diodes are referred to as Zener diodes ZD. The constant voltage generating unit 130 including the Zener diode ZD has a cathode 130a and an anode 130b. A system current from the onshore power supply device flows into the cathode 130a of the Zener diode ZD. The constant voltage generating unit 130 obtains a constant voltage by utilizing a breakdown voltage due to the Zener effect when a voltage is applied between the cathode 130a and anode 130b of the Zener diode ZD. The product of the obtained constant voltage and the system current corresponds to the power consumption within the submarine device 20. Therefore, n Zener diodes are cascaded depending on the power consumption. Note that the constant voltage generating unit 130 is not limited to including the Zener diode ZD as long as it can generate a constant voltage.

[0033] <Remote control receiver> The remote control receiving unit 140 receives a remote control signal transmitted from the land device 90 via the cable CB. The remote control receiving unit 140 converts the received optical signal, which is the remote control signal, into an electrical signal and then decodes it into a control command for the internal operation of the submarine device 20. For example, the remote control receiving unit 140 switches the switch SW1 that applies a power supply voltage to the laser element 111.

[0034] The remote control receiving unit 140 has one terminal 140a and the other terminal 140b. The remote control receiving unit 140 is connected to the constant voltage generating unit 130 so that a constant voltage is applied. Specifically, the one terminal 140a of the remote control receiving unit 140 is connected to the cathode 130a of the constant voltage generating unit 130. The other terminal 140b of the remote control receiving unit 140 is connected to the anode 130b of the constant voltage generating unit 130.

[0035] The remote control receiving unit 140 controls the on and off of the switch SW1. The switch SW1 connects and disconnects the cathode 130a and one terminal 140a to and from the anode 111a and one terminal 120a. For example, when the switch SW1 is on, it connects the cathode 130a and one terminal 140a to and from the anode 111a and one terminal 120a. When the switch SW1 is off, it disconnects the cathode 130a and one terminal 140a from and from the anode 111a and one terminal 120a.

[0036] The remote control receiving unit 140 receives a remote control signal transmitted from a land device 90 such as a terminal station to the submarine device 20. When responding to the remote control signal, the remote control receiving unit 140 turns on the switch SW1 to activate the laser element 111 and the temperature adjusting unit 120. This allows the laser element 111 to be adjusted to a predetermined set temperature, thereby generating a laser light optical signal having a predetermined wavelength.

[0037] On the other hand, except when responding to a remote control signal, remote control receiver 140 turns off switch SW1 to stop laser element 111 and temperature adjuster 120. This makes it possible to suppress wear and tear on laser element 111.

[0038] The subsea device 20 may include an information processing unit (not shown) having information processing functions including a computer. The information processing unit has a control unit, a communication unit, and a storage unit (not shown). The control unit, the communication unit, and the storage unit function as a control means, a communication means, and a storage means, respectively.

[0039] The control unit includes a processor such as a CPU (Central Processing Unit), MPU (Micro Processing Unit), ECU (Electronic Control Unit), FPGA (Field-Programmable Gate Array), or ASIC (Application Specific Integrated Circuit). The control unit functions as a calculation device that performs control processing, calculation processing, and the like. The control unit also controls the operation of each component, such as the communication unit, memory unit, laser module 110, temperature adjustment unit 120, constant voltage generation unit 130, and remote control receiving unit 140.

[0040] Each component of the subsea device 20 can be realized, for example, by executing a program under the control of a control unit. More specifically, each component can be realized by the control unit executing a program stored in a storage unit. Alternatively, each component may be realized by recording the necessary program on any non-volatile recording medium and installing it as needed. Furthermore, each component is not limited to being realized by software using a program, but may also be realized by any combination of hardware, firmware, and software.

[0041] The communication unit performs communication necessary for the information processing unit to perform information processing. The storage unit is, for example, a ROM (Read Only Memory) or a RAM (Random Access Memory). The storage unit has a function for storing control programs and calculation programs executed by the control unit. The storage unit also has a function for temporarily storing processing data, etc.

[0042] <Submarine device control method> Next, a control method for the submarine device 20 in this embodiment will be described. Fig. 5 is a flow chart illustrating an example of a control method for the submarine device 20 according to embodiment 2. As shown in Fig. 5, the control method for the submarine device 20 in this embodiment includes a start-up step (step S21), a temperature adjustment step (step S22), an optical signal generation step (step S23), and a stop step (step S24).

[0043] First, as shown in step S21, in a startup step, the laser element 111 and the temperature adjustment unit 120 are started up. Specifically, when the remote control receiving unit 140 responds to a remote control signal, the switch SW1 is turned on to start up the laser element 111 and the temperature adjustment unit 120.

[0044] Next, as shown in step S22, in a temperature adjustment step, the temperature of laser element 111 is adjusted by temperature adjustment unit 120. Next, as shown in step S23, in an optical signal generation step, laser element 111 is caused to generate an optical signal.

[0045] Next, as shown in step S24, in a stopping step, switch SW1 is turned off to stop laser element 111 and temperature adjustment unit 120 unless remote control receiver 140 responds to a remote control signal.

[0046] According to this embodiment, the operation of the laser element 111 and the temperature adjustment unit 120 is stopped except when the remote control receiving unit 140 responds to a remote control signal. This makes it possible to suppress the progression of wear-related deterioration. This allows the submarine cable system 1 and the submarine device 20 to operate stably for a long period of time. Other configurations and effects are included in the description of embodiment 1.

[0047] (Embodiment 3) Next, a description will be given of an undersea device according to a third embodiment. The undersea device 20 in the second embodiment stops the operation of the laser element 111 and the temperature adjustment unit 120 in order to suppress the progress of deterioration due to wear, except when responding to a remote control signal. However, Laser element 111 When the laser module 110 is stopped, the current consumed by the laser module 110 may flow into the constant voltage generating unit 130 that generates the constant voltage. In this case, the constant voltage generating unit 130 may generate excessive heat, which may adversely affect the long-term reliability of the constant voltage generating unit 130, such as the Zener diode ZD. This may lead to a breakdown of the submarine device 20. Therefore, the submarine device of this embodiment is provided with a pseudo power load unit.

[0048] Figure 6 is a circuit diagram illustrating a submarine device according to embodiment 3. As shown in Figure 6, the submarine device 30 of this embodiment further includes a pseudo power load unit 150 and a switch SW2. The pseudo power load unit 150 and the switch SW2 function as pseudo power load means and switch means, respectively. Below, the <pseudo power load unit> will be explained, followed by a <method of controlling the submarine device>.

[0049] <Pseudo power load section> The pseudo power supply load unit 150 is a load that consumes power. For example, the pseudo power supply load unit 150 consumes power substantially equal to that of the laser element 111. The pseudo power supply load unit 150 has one terminal 150a and the other terminal 150b. The pseudo power supply load unit 150 is connected to the constant voltage generating unit 130 via a switch SW2 so that a constant voltage is applied. Specifically, the one terminal 150a of the pseudo power supply load unit 150 is connected to the one terminal 140a and the cathode 130a via the switch SW2. The other terminal 150b of the pseudo power supply load unit 150 is connected to the other terminal 140b and the anode 130b.

[0050] The switch SW2 is controlled by the remote control receiving unit 140. The remote control receiving unit 140 controls the ON and OFF states of the switch SW2. The switch SW2 connects and disconnects one terminal 150a from one terminal 140a and the cathode 130a. For example, when the switch SW2 is ON, the one terminal 150a is connected to one terminal 140a and the cathode 130a. When the switch SW2 is OFF, the one terminal 150a is disconnected from one terminal 140a and the cathode 130a.

[0051] When responding to a remote control signal from a land terminal device, the remote control receiving unit 140 turns on the switch SW1 to activate the laser element 111 and the temperature adjusting unit 120. At the same time, it turns off the switch SW2 to disconnect the pseudo power supply load unit 150 from the constant voltage generating unit 130. This makes it possible to adjust the laser element 111 to a predetermined set temperature and to suppress sudden changes in the current and voltage in the constant voltage generating unit 130.

[0052] On the other hand, except when responding to a remote control signal from a land terminal device, the remote control receiving unit 140 turns on switch SW2 to connect the pseudo power supply load unit 150 to the constant voltage generating unit 130. At the same time, it turns off switch SW1 to stop the laser element 111 and the temperature adjusting unit 120. This makes it possible to suppress wear on the laser element 111, and also to prevent the current consumption of the laser module 110 from flowing into the constant voltage generating unit 130, thereby suppressing excessive heat generation by the constant voltage generating unit 130.

[0053] <Submarine device control method> Next, a control method for the submarine unit 30 according to this embodiment will be described. Fig. 7 is a flow chart illustrating a control method for the submarine unit 30 according to embodiment 3. As shown in Fig. 7, the control method for the submarine unit 30 according to this embodiment includes a start-up step (step S31), a pseudo-power load disconnection step (step S32), a temperature adjustment step (step S33), an optical signal generation step (step S34), a pseudo-power load connection step (step S35), and a stop step (step S36).

[0054] First, as shown in step S31, in a startup step, the laser element 111 and the temperature adjustment unit 120 are started up. Specifically, when the remote control receiving unit 140 responds to a remote control signal, the switch SW1 is turned on to start up the laser element 111 and the temperature adjustment unit 120.

[0055] Next, as shown in step S32, in a pseudo power load disconnection step, the pseudo power load unit 150 is disconnected from the constant voltage generation unit 130. Specifically, when the remote control receiving unit 140 responds to the remote control signal, the switch SW2 is turned off to disconnect the pseudo power load unit 150 from the constant voltage generation unit 130. Note that the order of steps S31 and S32 is not limited to this, and they may be performed at the same timing.

[0056] Next, as shown in step S33, in a temperature adjustment step, the temperature of laser element 111 is adjusted by temperature adjustment unit 120. Next, as shown in step S34, in an optical signal generation step, laser element 111 is caused to generate an optical signal.

[0057] Next, as shown in step S35, in a pseudo power supply load connection step, the pseudo power supply load unit 150 is connected to the constant voltage generation unit 130. Specifically, except when the remote control receiving unit 140 responds to a remote control signal, the switch SW2 is turned on to connect the pseudo power supply load unit 150 to the constant voltage generation unit 130.

[0058] Next, as shown in step S36, in a stop step, unless the remote control receiving unit 140 responds to a remote control signal, the switch SW1 is turned off to stop the laser element 111 and the temperature adjusting unit 120. Note that the order of steps S35 and S36 is not limited to this, and they may be performed at the same time. In this manner, the submarine device 30 is controlled.

[0059] According to this embodiment, the remote control receiving unit 140 connects the pseudo power supply load unit 150 to the constant voltage generating unit 130 except when responding to a remote control signal. Laser element 111 When the laser module 110 is stopped, the current consumption of the laser module 110 is prevented from flowing into the constant voltage generating unit 130. This makes it possible to prevent excessive heat generation in the constant voltage generating unit 130, and to operate the submarine cable system 1 and the submarine device 30 stably for a long period of time. Other configurations and effects are included in the description of the first and second embodiments.

[0060] (Embodiment 4) Next, a submarine device according to a fourth embodiment will be described. In a submarine cable system 1, the wavelength of an optical signal used for remote control from onshore is predetermined. When responding to a remote control signal, the submarine device 30 is required to generate an optical signal of the predetermined wavelength. The laser module 110 obtains the desired wavelength by adjusting the temperature of the laser element 111 using a temperature adjustment unit 120.

[0061] When power supply is switched from the pseudo power load unit 150 to the laser module 110 in response to a remote control signal, there may be a large difference in temperature between the set temperature of the laser element 111 at which the desired wavelength is obtained and the temperature of the laser element 111 at the time of switching. In this case, an excessive current close to the system current may flow in order to eliminate this temperature difference. This makes it difficult for the constant voltage generating unit 130 including the Zener diode ZD to secure the current necessary to maintain a constant voltage, which may cause the submarine device 30 to shut down.

[0062] Therefore, in this embodiment, the temperature adjusting unit 120 is constantly energized as a pseudo power supply load of a constant current supply type, thereby keeping the temperature of the laser element 111 constant.

[0063] FIG. 8 illustrates an undersea device according to the fourth embodiment. Circuit Diagram 8, the submarine unit 40 of this embodiment includes a laser module 110, a temperature adjustment unit 220, a constant voltage generation unit 130, a remote control receiving unit 140, and a switch SW3. The laser module 110, the temperature adjustment unit 220, the constant voltage generation unit 130, the remote control receiving unit 140, and the switch SW3 function as a laser light emitting means, a temperature adjustment means, a constant voltage generation means, a remote control receiving means, and a switch means, respectively. The submarine unit 40 of this embodiment does not include a pseudo power load unit 150.

[0064] The laser element 111 is connected to the constant voltage generator 130 via the switch SW3 so that a constant voltage is applied. Specifically, the anode 111a of the laser element 111 is connected to the cathode 130a of the constant voltage generator 130 via the switch SW3. The cathode 111b of the laser element 111 is connected to the anode 130b of the constant voltage generator 130.

[0065] The temperature adjustment unit 220 functions as a pseudo power supply load. Specifically, the temperature adjustment unit 220 is configured as a load that consumes power. For example, the temperature adjustment unit 220 may be configured to consume substantially the same amount of power as the laser element 111. The temperature adjustment unit 220 has one terminal 220a and the other terminal 220b. The temperature adjustment unit 220 is connected to the constant voltage generation unit 130 so that a constant voltage is applied. Specifically, the one terminal 220a of the temperature adjustment unit 220 is connected to the cathode 130a of the constant voltage generation unit 130. The other terminal 220b of the temperature adjustment unit 220 is connected to the anode 130b of the constant voltage generation unit 130. In this way, the temperature adjustment unit 220 of this embodiment is not connected to the constant voltage generation unit 130 via a switch that connects and disconnects the temperature adjustment unit 220. The temperature adjustment unit 220 is connected to the constant voltage generation unit 130 so that a constant voltage is always applied. That is, the temperature adjusting unit 220 is constantly energized as a pseudo power supply load of a constant current supply type.

[0066] One terminal 140a of the remote control receiving unit 140 is connected to the cathode 130a of the constant voltage generating unit 130 and one terminal 220a of the temperature adjusting unit 220. The other terminal 140b of the remote control receiving unit 140 is connected to the anode 130b of the constant voltage generating unit 130 and the other terminal 220b of the temperature adjusting unit 220.

[0067] The remote control receiver 140 controls the on and off of the switch SW3. The switch SW3 connects and disconnects the cathode 130a, one terminal 140a, one terminal 220a, and the anode 111a. For example, when the switch SW3 is on, the cathode 130a, one terminal 140a, one terminal 220a, and the anode 111a are connected. When the switch SW3 is off, the cathode 130a, one terminal 140a, one terminal 220a, and the anode 111a are disconnected.

[0068] The remote control receiver 140 receives a remote control signal transmitted from a land device 90, such as a terminal station, to the submarine device 40. When responding to the remote control signal, the remote control receiver 140 turns on the switch SW3 to activate the laser element 111. In this embodiment, a power supply voltage is always applied to the temperature adjuster 220. Therefore, the temperature adjuster 220 controls the temperature of the laser element 111 by passing a current through the cooling / heating unit 122 so that the laser element 111 can generate an optical signal of a predetermined wavelength. This allows the laser element 111 to be adjusted to a predetermined set temperature upon activation. Therefore, there is no significant temperature difference between the actual temperature of the laser element 111 and the predetermined set temperature, and the temperature adjuster 220 does not perform abrupt cooling / heating control. This prevents abrupt current fluctuations and abrupt changes in the system current distribution. This allows the constant voltage generated by the constant voltage generator 130, such as a Zener diode ZD, to be maintained. The laser element 111 can also generate an optical signal of laser light having a predetermined wavelength.

[0069] On the other hand, except when responding to a remote control signal, remote control receiver 140 turns off switch SW3 to stop laser element 111. This can reduce wear and tear on laser element 111. Other configurations are as described in the above-mentioned embodiments 1 to 3.

[0070] <Submarine device control method> Next, a control method for the submarine device 40 according to this embodiment will be described. FIG. 9 is a flow chart illustrating a control method for the submarine device 40 according to the fourth embodiment. As shown in FIG. 9, the control method for the submarine device 40 according to this embodiment includes a temperature adjustment step (step S41), a startup step (step S42), and an optical signal generation step (step S43). S43 ) and stop step (step S44 ) is provided.

[0071] First, as shown in step S41, in a temperature adjustment step, the temperature of laser element 111 is adjusted by temperature adjustment unit 120. Next, as shown in step S42, in a startup step, laser element 111 is started. Specifically, when remote control receiving unit 140 responds to a remote control signal, switch SW3 is turned on to start laser element 111.

[0072] Next, as shown in step S43, in an optical signal generation step, an optical signal is generated by the laser element 111. The optical signal is to be used when responding to a remote control signal received via cable CB from the land device 90 located on land.

[0073] Next, as shown in step S44, in a stopping step, switch SW3 is turned off to stop laser element 111 unless remote control receiver 140 responds to a remote control signal.

[0074] According to this embodiment, the temperature adjustment unit 220, the cooling / heating unit 112, and the temperature measurement unit 113 that control the temperature of the laser element 111 are used as dummy loads of the power supply load, thereby eliminating the temperature difference between the temperature of the laser element 111 and the set temperature. Therefore, it is possible to suppress a sudden fluctuation in current supply to the cooling / heating unit 112 of the temperature adjustment unit 220 that occurs when current is applied to the laser element 111. Therefore, in a constant current power supply system represented by the submarine cable system 1, it is possible to suppress a sudden current fluctuation that occurs when power is applied to the laser module 110 in an attempt to eliminate the temperature difference between the temperature of the laser element 111 and the set temperature, and it is possible to maintain the constant voltage obtained by the constant voltage generation unit 130, such as a Zener diode.

[0075] Furthermore, the laser module 110 starts up in a state where there is no temperature difference between the temperature of the laser element 111 and the set temperature. This allows the temperature feedback control by the temperature adjustment unit 220 to quickly converge, thereby shortening the settling time of the laser element 111 at startup.

[0076] Furthermore, the laser element 111 is stopped unless the remote control receiver 140 responds to a remote control signal. This makes it possible to suppress the progression of wear deterioration. Other configurations and effects are included in the descriptions of the first to third embodiments.

[0077] The present disclosure is not limited to the above-described embodiments, and can be modified as appropriate without departing from the spirit of the present disclosure. For example, the configurations of the first to fourth embodiments can be combined.

[0078] Also within the scope of the technical concept of the embodiments is a control program for a subsea device that can be loaded into a computer and executes the above-described control method for a subsea device. The control program for a subsea device may be stored on a non-transitory computer-readable medium or a tangible storage medium. By way of example and not limitation, computer-readable medium or tangible storage medium includes random-access memory (RAM), read-only memory (ROM), flash memory, solid-state drive (SSD) or other memory technology, CD-ROM, digital versatile disc (DVD), Blu-ray (registered trademark) disc or other optical disk storage, magnetic cassette, magnetic tape, magnetic disk storage or other magnetic storage device. The control program for a subsea device may be transmitted on a transitory computer-readable medium or a communication medium. By way of example and not limitation, the transitory computer-readable medium or communication medium includes electrical, optical, acoustic, or other forms of propagated signals.

[0079] Some or all of the above-described embodiments can be described as, but are not limited to, the following supplementary notes.

[0080] (Appendix 1) a laser element for generating an optical signal for use in responding to remote control signals received over a cable from land-based equipment; a temperature adjusting means for adjusting the temperature of the laser element; Equipped with Subsea equipment placed on the seabed. (Appendix 2) a constant voltage generating means for generating a constant voltage; remote control receiving means for receiving the remote control signal; a laser module including the laser element, a cooling / heating means for cooling and heating the laser element, and a temperature measuring means for measuring the temperature of the laser element; Furthermore, the temperature adjusting means is connected to the constant voltage generating means via a first switch so that the constant voltage is applied, and controls the cooling / heating means so that the temperature measured by the temperature measuring means becomes a predetermined temperature; the laser element is connected to the constant voltage generating means via the first switch so that the constant voltage is applied to the laser element; When responding to the remote control signal, the remote control receiving means turns on the first switch to activate the laser element and the temperature adjusting means, and when not responding to the remote control signal, turns off the first switch to stop the laser element and the temperature adjusting means. 1. The subsea device described in Appendix 1. (Appendix 3) a pseudo power supply load means that is connected to the constant voltage generating means via a second switch so that the constant voltage is applied thereto, and that consumes power; Furthermore, When responding to the remote control signal, the remote control receiving means turns off the second switch to disconnect the pseudo power supply load means from the constant voltage generating means, and when not responding to the remote control signal, turns on the second switch to connect the pseudo power supply load means to the constant voltage generating means. 1. The subsea device described in Appendix 2. (Appendix 4) a constant voltage generating means for generating a constant voltage; remote control receiving means for receiving the remote control signal; a laser module including the laser element, a cooling / heating means for cooling and heating the laser element, and a temperature measuring means for measuring the temperature of the laser element; Furthermore, the laser element is connected to the constant voltage generating means via a third switch so that the constant voltage is applied to the laser element; the temperature adjusting means, as a pseudo power supply load means consuming power, is connected to the constant voltage generating means so that the constant voltage is always applied, and controls the cooling / heating means so that the temperature measured by the temperature measuring means becomes a predetermined temperature; When responding to the remote control signal, the remote control receiving means turns on the third switch to activate the laser element, and when not responding to the remote control signal, turns off the third switch to stop the laser element. 1. The subsea device described in Appendix 1. (Appendix 5) the constant voltage generating means includes a plurality of Zener diodes; 5. The submarine device according to any one of appendices 2 to 4. (Appendix 6) the land-based device includes a power supply device; the cables include power supply cables; the constant voltage generating means generates the constant voltage by a constant current power supply method using a current supplied from the power supply device via the power supply cable. 6. The submarine device according to any one of appendices 2 to 5. (Appendix 7) the wavelength of the laser light generated by the laser element varies depending on the temperature of the laser element; 7. The submarine device according to any one of appendices 1 to 6. (Appendix 8) a land-based device located on land; a subsea device disposed on the seabed; a cable connecting the land device and the submarine device; Equipped with The submarine device a laser element for generating an optical signal for use in responding to remote control signals received over the cable from the land-based device; a temperature adjusting means for adjusting the temperature of the laser element; A submarine cable system having: (Appendix 9) The submarine device a constant voltage generating means for generating a constant voltage; remote control receiving means for receiving the remote control signal; a laser module including the laser element, a cooling / heating means for cooling and heating the laser element, and a temperature measuring means for measuring the temperature of the laser element; Furthermore, the temperature adjusting means is connected to the constant voltage generating means via a first switch so that the constant voltage is applied, and controls the cooling / heating means so that the temperature measured by the temperature measuring means becomes a predetermined temperature; the laser element is connected to the constant voltage generating means via the first switch so that the constant voltage is applied to the laser element; When responding to the remote control signal, the remote control receiving means turns on the first switch to activate the laser element and the temperature adjusting means, and when not responding to the remote control signal, turns off the first switch to stop the laser element and the temperature adjusting means. 10. A submarine cable system as described in Appendix 8. (Appendix 10) The submarine device a pseudo power supply load means that is connected to the constant voltage generating means via a second switch so that the constant voltage is applied thereto, and that consumes power; Furthermore, When responding to the remote control signal, the remote control receiving means turns off the second switch to disconnect the pseudo power supply load means from the constant voltage generating means, and when not responding to the remote control signal, turns on the second switch to connect the pseudo power supply load means to the constant voltage generating means. 10. A submarine cable system as described in Appendix 9. (Appendix 11) The submarine device a constant voltage generating means for generating a constant voltage; remote control receiving means for receiving the remote control signal; a laser module including the laser element, a cooling / heating means for cooling and heating the laser element, and a temperature measuring means for measuring the temperature of the laser element; Furthermore, the laser element is connected to the constant voltage generating means via a third switch so that the constant voltage is applied to the laser element; the temperature adjusting means, as a pseudo power supply load means consuming power, is connected to the constant voltage generating means so that the constant voltage is always applied, and controls the cooling / heating means so that the temperature measured by the temperature measuring means becomes a predetermined temperature; When responding to the remote control signal, the remote control receiving means turns on the third switch to activate the laser element, and when not responding to the remote control signal, turns off the third switch to stop the laser element. 10. A submarine cable system as described in Appendix 8. (Appendix 12) the constant voltage generating means includes a plurality of Zener diodes; 12. A submarine cable system according to any one of Supplementary Notes 9 to 11. (Appendix 13) the land-based device includes a power supply device; the cables include power supply cables; the constant voltage generating means generates the constant voltage by a constant current power supply method using a current supplied from the power supply device via the power supply cable. A submarine cable system according to any one of Supplementary Notes 9 to 12. (Appendix 14) the wavelength of the laser light generated by the laser element varies depending on the temperature of the laser element; A submarine cable system according to any one of Supplementary Notes 8 to 13. (Appendix 15) a temperature adjustment step of adjusting the temperature of the laser element of the submarine device, the submarine device comprising: a laser element for generating an optical signal used in responding to a remote control signal received via a cable from a land device located on land; and a temperature adjustment means for adjusting the temperature of the laser element; an optical signal generating step of causing the laser element to generate the optical signal; A method for controlling a submarine device comprising: (Appendix 16) a constant voltage generating means for generating a constant voltage; remote control receiving means for receiving the remote control signal; a laser module including the laser element, a cooling / heating means for cooling and heating the laser element, and a temperature measuring means for measuring the temperature of the laser element; Furthermore, the temperature adjusting means is connected to the constant voltage generating means via a first switch so that the constant voltage is applied, and controls the cooling / heating means so that the temperature measured by the temperature measuring means becomes a predetermined temperature; The laser element is connected to the constant voltage generating means via the first switch so that the constant voltage is applied, a start-up step of turning on the first switch to start up the laser element and the temperature adjusting means when the remote control receiving means responds to the remote control signal; a stopping step of turning off the first switch to stop the laser element and the temperature adjusting means except when the remote control receiving means responds to the remote control signal; 16. The method of controlling a submarine device according to claim 15, further comprising: (Appendix 17) a pseudo power supply load means that is connected to the constant voltage generating means via a second switch so that the constant voltage is applied thereto, and that consumes power; The method for controlling the submarine device further comprises: a pseudo power supply load disconnecting step of turning off the second switch to disconnect the pseudo power supply load means from the constant voltage generating means when the remote control receiving means responds to the remote control signal; a pseudo power supply load connecting step of turning on the second switch and connecting the pseudo power supply load means to the constant voltage generating means except when the remote control receiving means responds to the remote control signal; 17. The method of controlling a submarine device according to claim 16, further comprising: (Appendix 18) a constant voltage generating means for generating a constant voltage; remote control receiving means for receiving the remote control signal; a laser module including the laser element, a cooling / heating means for cooling and heating the laser element, and a temperature measuring means for measuring the temperature of the laser element; Furthermore, the laser element is connected to the constant voltage generating means via a third switch so that the constant voltage is applied to the laser element; The temperature adjustment means is connected to the constant voltage generation means as a pseudo power load means that consumes power so that the constant voltage is always applied, and the method for controlling the cooling / heating means controls the temperature measured by the temperature measuring means to become a predetermined temperature, a laser element starting step of turning on the third switch to start the laser element when the remote control receiving means responds to the remote control signal; a laser element stopping step of turning off the third switch to stop the laser element except when the remote control receiving means responds to the remote control signal; 16. A method for controlling a submarine device according to claim 15, comprising: (Appendix 19) the constant voltage generating means includes a plurality of Zener diodes; A method for controlling a submarine device according to any one of Supplementary Notes 16 to 18. (Appendix 20) the land-based device includes a power supply device; the cables include power supply cables; the constant voltage generating means generates a constant voltage by a constant current power supply method using a current supplied from the power supply device via the power supply cable. A method for controlling a submarine device according to any one of Supplementary Notes 16 to 19. (Appendix 21) the wavelength of the laser light generated by the laser element varies depending on the temperature of the laser element; A method for controlling a submarine device according to any one of Supplementary Notes 15 to 20. (Appendix 22) a temperature adjustment step of adjusting the temperature of the laser element of the submarine device, the submarine device comprising: a laser element for generating an optical signal used in responding to a remote control signal received via a cable from a land device located on land; and a temperature adjustment means for adjusting the temperature of the laser element; an optical signal generating step of causing the laser element to generate the optical signal; A non-transitory computer-readable medium storing a control program for an undersea device that causes a computer to execute the above. (Appendix 23) a constant voltage generating means for generating a constant voltage; remote control receiving means for receiving the remote control signal; a laser module including the laser element, a cooling / heating means for cooling and heating the laser element, and a temperature measuring means for measuring the temperature of the laser element; Furthermore, the temperature adjusting means is connected to the constant voltage generating means via a first switch so that the constant voltage is applied, and controls the cooling / heating means so that the temperature measured by the temperature measuring means becomes a predetermined temperature; The laser element is connected to the constant voltage generating means via the first switch so that the constant voltage is applied. A control program for the submarine device, a start-up step of turning on the first switch to start up the laser element and the temperature adjusting means when the remote control receiving means responds to the remote control signal; a stopping step of turning off the first switch to stop the laser element and the temperature adjusting means except when the remote control receiving means responds to the remote control signal; A non-transitory computer-readable medium having stored thereon a control program for a submarine device according to claim 22, which causes a computer to execute the program. (Appendix 24) a pseudo power supply load means that is connected to the constant voltage generating means via a second switch so that the constant voltage is applied thereto, and that consumes power; A control program for the submarine device further comprising: a pseudo power supply load disconnecting step of turning off the second switch to disconnect the pseudo power supply load means from the constant voltage generating means when the remote control receiving means responds to the remote control signal; a pseudo power supply load connecting step of turning on the second switch and connecting the pseudo power supply load means to the constant voltage generating means except when the remote control receiving means responds to the remote control signal; A non-transitory computer-readable medium having stored thereon a control program for a submarine device according to claim 23, which further causes a computer to execute the program. (Appendix 25) a constant voltage generating means for generating a constant voltage; remote control receiving means for receiving the remote control signal; a laser module including the laser element, a cooling / heating means for cooling and heating the laser element, and a temperature measuring means for measuring the temperature of the laser element; Furthermore, the laser element is connected to the constant voltage generating means via a third switch so that the constant voltage is applied to the laser element; the temperature adjustment means is a pseudo power supply load means that consumes power, and is connected to the constant voltage generation means so that the constant voltage is always applied, and the submarine device control program controls the heating and cooling means so that the temperature measured by the temperature measurement means becomes a predetermined temperature, a laser element starting step of turning on the third switch to start the laser element when the remote control receiving means responds to the remote control signal; a laser element stopping step of turning off the third switch to stop the laser element except when the remote control receiving means responds to the remote control signal; A non-transitory computer-readable medium having stored thereon a control program for a submarine device according to claim 22, which causes a computer to execute the program. (Appendix 26) the constant voltage generating means includes a plurality of Zener diodes; A non-transitory computer-readable medium storing a control program for an undersea device according to any one of appendices 23 to 25. (Appendix 27) the land-based device includes a power supply device; the cables include power supply cables; the constant voltage generating means generates a constant voltage by a constant current power supply method using a current supplied from the power supply device via the power supply cable. A non-transitory computer-readable medium storing a control program for an undersea device according to any one of appendices 23 to 26. (Appendix 28) the wavelength of the laser light generated by the laser element varies depending on the temperature of the laser element; A non-transitory computer-readable medium storing a control program for an undersea device according to any one of Supplementary Notes 22 to 27. [Explanation of symbols]

[0081] 1 Submarine cable system 10, 20, 30, 40 submarine equipment 90 Land Equipment 110 Laser Module 111 Laser element 111a anode 111b cathode 112 Cooling and heating section 113 Temperature measuring unit 120 Temperature adjustment section 120a, 120b terminals 130 Constant voltage generation unit 130a cathode 130b Anode 140 Remote control receiver 140a, 140b terminals 150 Pseudo power load section 150a, 150b terminals 220 Temperature adjustment section 220a, 220b terminals CB cable SW1, SW2, SW3 switches

Claims

1. a laser element for generating an optical signal for use in responding to remote control signals received over a cable from land-based equipment; a temperature adjusting means for adjusting the temperature of the laser element; Equipped with A subsea device disposed on the seabed, comprising: a constant voltage generating means for generating a constant voltage; remote control receiving means for receiving the remote control signal; a laser module including the laser element, a cooling / heating means for cooling and heating the laser element, and a temperature measuring means for measuring the temperature of the laser element; Furthermore, the temperature adjusting means is connected to the constant voltage generating means via a first switch so that the constant voltage is applied, and controls the cooling / heating means so that the temperature measured by the temperature measuring means becomes a predetermined temperature; the laser element is connected to the constant voltage generating means via the first switch so that the constant voltage is applied to the laser element; When responding to the remote control signal, the remote control receiving means turns on the first switch to activate the laser element and the temperature adjusting means, and when not responding to the remote control signal, turns off the first switch to stop the laser element and the temperature adjusting means. Undersea equipment.

2. a pseudo power supply load means that is connected to the constant voltage generating means via a second switch so that the constant voltage is applied to the pseudo power supply load means and consumes power; Furthermore, When responding to the remote control signal, the remote control receiving means turns off the second switch to disconnect the pseudo power supply load means from the constant voltage generating means, and when not responding to the remote control signal, turns on the second switch to connect the pseudo power supply load means to the constant voltage generating means.

10. The subsea device of claim 1.

3. a laser element for generating an optical signal for use in responding to remote control signals received over a cable from land-based equipment; a temperature adjusting means for adjusting the temperature of the laser element; Equipped with A subsea device disposed on the seabed, comprising: a constant voltage generating means for generating a constant voltage; remote control receiving means for receiving the remote control signal; a laser module including the laser element, a cooling / heating means for cooling and heating the laser element, and a temperature measuring means for measuring the temperature of the laser element; Furthermore, the laser element is connected to the constant voltage generating means via a third switch so that the constant voltage is applied to the laser element; the temperature adjusting means, as a pseudo power supply load means consuming power, is connected to the constant voltage generating means so that the constant voltage is always applied, and controls the cooling / heating means so that the temperature measured by the temperature measuring means becomes a predetermined temperature; the remote control receiving means turns on the third switch to activate the laser element when responding to the remote control signal, and turns off the third switch to stop the laser element when not responding to the remote control signal; Undersea equipment.

4. the constant voltage generating means includes a plurality of Zener diodes; The submarine device according to any one of claims 1 to 3.

5. the land-based device includes a power supply device; the cables include power supply cables; the constant voltage generating means generates the constant voltage by a constant current power supply method using a current supplied from the power supply device via the power supply cable. The submarine device according to any one of claims 1 to 3.

6. the wavelength of the laser light generated by the laser element varies depending on the temperature of the laser element; The submarine device according to any one of claims 1 to 3.

7. a land-based device located on land; a subsea device disposed on the seabed; a cable connecting the land device and the submarine device; Equipped with The submarine device a laser element for generating an optical signal for use in responding to remote control signals received over the cable from the land-based device; a temperature adjusting means for adjusting the temperature of the laser element; a constant voltage generating means for generating a constant voltage; remote control receiving means for receiving the remote control signal; a laser module including the laser element, a cooling / heating means for cooling and heating the laser element, and a temperature measuring means for measuring the temperature of the laser element; and the temperature adjusting means is connected to the constant voltage generating means via a first switch so that the constant voltage is applied, and controls the cooling / heating means so that the temperature measured by the temperature measuring means becomes a predetermined temperature; the laser element is connected to the constant voltage generating means via the first switch so that the constant voltage is applied to the laser element; When responding to the remote control signal, the remote control receiving means turns on the first switch to activate the laser element and the temperature adjusting means, and when not responding to the remote control signal, turns off the first switch to stop the laser element and the temperature adjusting means. Submarine cable system.

8. a land-based device located on land; a subsea device disposed on the seabed; a cable connecting the land device and the submarine device; Equipped with The submarine device a laser element for generating an optical signal for use in responding to remote control signals received over the cable from the land-based device; a temperature adjusting means for adjusting the temperature of the laser element; a constant voltage generating means for generating a constant voltage; remote control receiving means for receiving the remote control signal; a laser module including the laser element, a cooling / heating means for cooling and heating the laser element, and a temperature measuring means for measuring the temperature of the laser element; and the laser element is connected to the constant voltage generating means via a third switch so that the constant voltage is applied to the laser element; the temperature adjusting means, as a pseudo power supply load means consuming power, is connected to the constant voltage generating means so that the constant voltage is always applied, and controls the cooling / heating means so that the temperature measured by the temperature measuring means becomes a predetermined temperature; the remote control receiving means turns on the third switch to activate the laser element when responding to the remote control signal, and turns off the third switch to stop the laser element when not responding to the remote control signal; Submarine cable system.

9. a temperature adjustment step of adjusting the temperature of the laser element of the submarine device, the submarine device comprising: a laser element for generating an optical signal used in responding to a remote control signal received via a cable from a land device located on land; and a temperature adjustment means for adjusting the temperature of the laser element; an optical signal generating step of causing the laser element to generate the optical signal; A method for controlling a submarine device comprising: The submarine device a constant voltage generating means for generating a constant voltage; remote control receiving means for receiving the remote control signal; a laser module including the laser element, a cooling / heating means for cooling and heating the laser element, and a temperature measuring means for measuring the temperature of the laser element; Furthermore, the temperature adjusting means is connected to the constant voltage generating means via a first switch so that the constant voltage is applied, and controls the cooling / heating means so that the temperature measured by the temperature measuring means becomes a predetermined temperature; a control method for an undersea device, wherein the laser element is connected to the constant voltage generating means via the first switch so that the constant voltage is applied, a start-up step of turning on the first switch to start up the laser element and the temperature adjusting means when the remote control receiving means responds to the remote control signal; a stopping step of turning off the first switch to stop the laser element and the temperature adjusting means except when the remote control receiving means responds to the remote control signal; The method for controlling a submarine device further comprises:

10. a temperature adjustment step of adjusting the temperature of the laser element of the submarine device, the submarine device comprising: a laser element for generating an optical signal used in responding to a remote control signal received via a cable from a land device located on land; and a temperature adjustment means for adjusting the temperature of the laser element; an optical signal generating step of causing the laser element to generate the optical signal; A control program for a submarine device that causes a computer to execute the following: The submarine device a constant voltage generating means for generating a constant voltage; remote control receiving means for receiving the remote control signal; a laser module including the laser element, a cooling / heating means for cooling and heating the laser element, and a temperature measuring means for measuring the temperature of the laser element; Furthermore, the temperature adjusting means is connected to the constant voltage generating means via a first switch so that the constant voltage is applied, and controls the cooling / heating means so that the temperature measured by the temperature measuring means becomes a predetermined temperature; The laser element is connected to the constant voltage generating means via the first switch so that the constant voltage is applied. A control program for the submarine device is a start-up step of turning on the first switch to start up the laser element and the temperature adjusting means when the remote control receiving means responds to the remote control signal; a stopping step of turning off the first switch to stop the laser element and the temperature adjusting means except when the remote control receiving means responds to the remote control signal; A control program for the undersea equipment that causes the computer to execute the above.

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