FR3058385A1 - SUBMARINE RADIOCOMMUNICATION SYSTEM, SUBMARINE RADIOCOMMUNICATION BUOY, AND SUBMARINE RADIO COMMUNICATION METHODS - Google Patents

Abstract

The submarine radio communication system comprises at least one radio communication device (6) on board a submarine, at least one radio antenna (8) carried by a buoy (10), and a radio transmission system. fiber arrangement (12) configured for transmitting, via a fiber optic link (14) connecting the buoy (10) to the submarine (2), radio signals between the radio antenna (8) and the radio apparatus radiocommunication (6).

Description

© Publication no .: 3,058,385 (to be used only for reproduction orders)

©) National registration number: 16 60847 ® FRENCH REPUBLIC

NATIONAL INSTITUTE OF INDUSTRIAL PROPERTY

COURBEVOIE

©) Int Cl ⁸ : B 63 G 8/38 (2017.01), H 04 B 10/2575, 13/02

A1 PATENT APPLICATION

©) Date of filing: 09.11.16. (30) Priority: ©) Applicant (s): ALSEAMAR Simplified joint stock company - FR. (72) Inventor (s): JACQUELIN YVON. ©) Date of availability of the request: 11.05.18 Bulletin 18/19. ©) List of documents cited in the preliminary search report: See the end of this booklet (© References to other related national documents: ©) Holder (s): ALSEAMAR Simplified joint-stock company. ©) Extension request (s): ©) Agent (s): LAVOIX.

SUBMARINE RADIOCOMMUNICATION SYSTEM, SUBMARINE RADIOCOMMUNICATION BUOY AND SUBMARINE RADIOCOMMUNICATION METHODS.

FR 3 058 385 - A1

The submarine radiocommunication system comprises at least one radiocommunication device (6) on board a submarine, at least one radio antenna (8) carried by a buoy (10), and a radio transmission system. over-fiber (12) configured for the transmission, via a fiber optic link (14) connecting the buoy (10) to the submarine (2), of radio signals between the radio antenna (8) and the radiocommunication (6).

Submarine radiocommunication system, submarine radiocommunication buoy and submarine radiocommunication methods

The present invention relates to the field of submarine radiocommunication systems.

It is possible to equip a submarine with a radiocommunication system comprising a radio antenna fixed on a releasable radiocommunication buoy connected to the submarine by a data transmission link. Such a radiocommunication system allows the submarine to transmit and / or receive radiocommunication signals while remaining underwater.

W02007 / 088258A1 discloses a radiocommunication system comprising a releasable buoy having a UHF (Ultra High Frequency) reception antenna and an associated UHF receiver, a satellite antenna for receiving signals from satellites of a satellite navigation system and a receiver associated radio navigation system, and a signal shaping module for transmitting data signals to the submarine via a data transmission link.

However, such a radiocommunication system proves to be expensive to use, in particular when the radiocommunication buoy is for single use, the buoy being abandoned once the radiocommunications are finished, or when the submarine has to descend to deep diving.

One of the aims of the invention is to propose a radiocommunication system which is inexpensive and easy to use.

To this end, the invention provides a submarine radiocommunication system, comprising at least one radiocommunication device on board a submarine, at least one radio antenna carried by a buoy, and a radio transmission system. over-fiber configured for the transmission, via a fiber optic link connecting the buoy to the submarine, of radio signals between the radio antenna and the radiocommunication device.

The radiocommunication system may include one or more of the following optional characteristics, taken individually or in any technically possible combination:

the radio-to-fiber transmission system comprises an electrooptical converter carried by the buoy and configured to convert a radio signal received by the radio antenna into a corresponding optical signal and / or to convert an optical signal into a corresponding radio signal and transmit it to the radio antenna for radiation;

- the radio-to-fiber transmission system includes an electrooptical converter located on board the submarine and optically coupled to the electrooptical buoy converter via the fiber optic link, and electrically coupled to the radiocommunication device, the electro- submarine optics being configured to perform the reverse conversion of each conversion performed by the electrooptical converter of the buoy;

- the radiocommunication device is chosen from the following group: a VHF transmitter / receiver, a UHF transmitter / receiver, a satellite radionavigation receiver, a terminal of a cellular telecommunications network or a terminal of a telecommunications network by satellite; and

the radiocommunication system comprises at least two separate radiocommunication devices on board the submarine, each radiocommunication device being connected to the radio antenna by means of the radio-on-fiber transmission system for reception and / or the emission of radio signals.

The invention also relates to a submarine equipped with a radiocommunication system as defined above.

The invention also relates to a radiocommunication buoy for a submarine, carrying at least one radio antenna and an electro-optical converter configured to convert a radio signal received by the radio antenna into a corresponding optical signal and / or to convert a signal. optical signal into a corresponding radio signal and transmit it to the radio antenna for radiation.

The invention also relates to a submarine comprising at least one radiocommunication device configured for receiving and / or transmitting radioelectric signals, and an electro-optical converter located on board the submarine and configured to convert a radioelectric signal. transmitted by the radiocommunication device into a corresponding optical signal and / or to convert a received optical signal into a corresponding radio signal and send it to the radiocommunication device.

The invention also further relates to a radiocommunication method for a submarine equipped with a radiocommunication system comprising at least one radiocommunication device located on board the submarine and a radio antenna carried by a buoy, the radiocommunication method comprising the capture of a radio signal using the radio antenna, the conversion of the received radio signal into a corresponding optical signal using an electro-optical converter carried by the buoy, the transmission of the optical signal from the buoy in the submarine via a fiber optic link connecting the buoy to the submarine, the conversion of the optical signal into an electrical signal using an electro-optical converter located on board the submarine to reconstruct the radio signal, and sending the reconstructed radio signal to the radio apparatus.

The invention also relates to a radiocommunication method for a submarine equipped with a radiocommunication system comprising at least one radiocommunication device located on board the submarine and a radio antenna carried by a buoy, the radiocommunication method comprising transmitting of a radio signal by the radiocommunication device, the conversion of the radio signal transmitted into an optical signal using an electro-optical converter on board the submarine, the transmission of the optical signal from the submarine to the buoy via a fiber optic link connecting the submarine to the buoy, converting the optical signal into an electrical signal using an electro-optical converter carried by the buoy to reconstruct the radio signal, and sending of the reconstituted radio signal to the radio antenna for its radiation.

The invention and its advantages will be better understood on reading the description which follows, given solely by way of nonlimiting example, and made with reference to the appended drawings, in which:

- Figure 1 is a schematic view of an entire submarine equipped with a radio communication system;

- Figure 2 is a more detailed schematic view of the radiocommunication system.

The submarine 2 in Figure 1 is equipped with a radio communication system 4 configured for the transmission and / or reception of radio signals when the submarine 2 is diving.

The radiocommunication system 4 comprises at least one radiocommunication device 6 located on board the submarine 2, a radio antenna 8 carried by a buoy 10, and a radio-on-fiber transmission system 12 configured for transmission, via a fiber optic link 14, of radio signals between the radio antenna 8 and the radiocommunication device 6.

The radiocommunication device 6 is configured to transmit and / or receive radio signals. The radiocommunication device 6 is transmitter, receiver or transmitter / receiver.

The radiocommunication device 6 is for example a VHF transmitter / receiver ("Very High Frequency >>), a UHF transmitter / receiver (" Ultra High Frequency >>), a radio navigation satellite receiver, terminal equipment of a cellular telecommunications network or terminal equipment of a satellite telecommunications network.

The radio antenna 8 is configured to radiate a radio signal and / or to receive a radio signal.

A radio signal propagates freely by radiation in the form of an electromagnetic wave or in a guided manner in an electrical conductor in the form of an electric signal.

A radio signal propagating in the form of an electromagnetic wave is transformed into a corresponding electric signal when it is picked up by the radio antenna 8.

A radio signal propagating in the form of an electric signal is transformed into an electromagnetic wave which propagates freely when it is radiated by the radio antenna 8

A radio signal picked up by the radio antenna 8 is in the form of an electric signal. A radio signal emitted by the radiocommunication device 6 is in the form of an electric signal.

The radiocommunication device 6 and the radio antenna 8 are provided for exchanging a radio signal with each other in the form of an electrical signal.

Buoy 10 is located at a distance from the submarine. The buoy 10 is connected to the submarine by the fiber optic link 14 for the transmission of optical signals between the buoy 10 and the submarine 2.

The buoy 10 is preferably dropable. It is configured to be carried by the submarine 2, for example in a hold of the submarine 2, and dropped by the submarine 2 when it is desired to carry out radio communications.

The buoy 10 is preferably for single use. It is intended to be abandoned by the submarine once the transmission and / or reception of radio signals has been completed.

The buoy 10 has buoyancy to keep the radio antenna 8 emerged out of the water. The buoy 10 is configured to float on the surface, a part of the body of the buoy 10 and the radio antenna 8 emerging from the water, or to float below the surface, the body of the buoy 10 remaining below the surface and the radio antenna 8 emerging from the water.

The buoy 10 is supplied with electricity from the submarine 2 by means of an electrical connection added to the fiber optic link 14 and / or by an electric accumulator carried by the buoy 10.

The radio-to-fiber transmission system 12 comprises an electro-optical converter 16 carried by the buoy 10 and an electro-optical converter 18 located on board the submarine 2, the electro-optical converters 16, 18 being optically coupled by the link fiber optic 14 so as to exchange optical signals between them.

Each electro-optical converter 16, 18 is configured to convert an electrical signal to a corresponding optical signal and / or to convert an optical signal to a corresponding electrical signal.

Each optical signal generated by an electro-optical converter 16, 18 is transmitted to the other via the fiber optic link 14.

The radio-on-fiber transmission system 12 is configured for the transmission of a radio signal received by the radio antenna 8 to the radiocommunication device 6 via the fiber optic link 14 and / or for the transmission of a radio signal emitted by the radiocommunication apparatus 6 towards the radio antenna 8 via the fiber optic link 14, with a view to its radiation.

The radio-on-fiber transmission system 12 is here configured for the transmission of a radio signal picked up by the radio antenna 8 of the buoy 10 to a radiocommunication device 6 of the submarine 2.

To do this, the electro-optical converter 16 of the buoy 8 is configured to convert a radio signal received by the radio antenna 8 into a corresponding optical signal, and the electro-optical converter 18 of the submarine is configured to convert the optical signal into an electrical signal so as to reconstitute the radio signal from the optical signal.

In the example illustrated, the electro-optical converter 16 of the buoy 10 comprises an electrical / optical conversion stage 20 for the conversion of a radio signal received by the radio antenna 8 into a corresponding optical signal, and the sending of the optical signal via the fiber optic link 14.

The electrical / optical conversion stage 20 comprises an optical transmitter 22 configured to convert an electrical signal into a corresponding optical signal. The optical transmitter 22 comprises for example a light-emitting diode, in particular a laser diode.

The optical transmitter 22 is electrically connected to the radio antenna 8 to receive as input the radio signal picked up by the radio antenna 8, and optically coupled to the electro-optical converter 18 of the submarine 2 via the fiber optic link 14 .

Furthermore, the electro-optical converter 18 of the submarine 2 comprises an optical / electrical conversion stage 24 for the reconstruction of a radio signal from an optical signal transmitted by the electro-optical converter 16 of the buoy 10 via fiber optic link 14.

The optical / electrical conversion stage 24 includes an optical receiver 26 configured to convert an optical signal into a corresponding electrical signal. The optical receiver 26 comprises for example a photodiode, in particular a PIN ("Positive Intrinsic Negative") diode, comprising a non-doped zone, called intrinsic, interposed between a P doped zone and a N doped zone.

The optical receiver 26 is optically coupled to the electro-optical converter 16 of the buoy 10 via the optical fiber link 14 to receive an optical signal sent by the electro-optical converter 16 of the buoy 10, and electrically connected to the radiocommunication 6 to send it the radio signal reconstructed from the received optical signal.

The optical receiver 26 of the electro-optical converter 18 of the submarine 2 is more precisely optically coupled to the optical transmitter 22 of the electro-optical converter 16 of the buoy 10 via the fiber optic link 14.

The electrical / optical conversion stage 20 of the electro-optical converter 16 of the buoy 10 optionally includes an electronic input amplifier 28 disposed between the radio antenna 8 and the optical transmitter 24, to amplify the radio signal between the radio antenna 8 and the optical transmitter 22. The electronic input amplifier 28 is for example a low noise amplifier (or LNA for "Low Noise Amplifier").

The optical / electrical conversion stage 24 of the electro-optical converter 18 of the submarine 2 optionally includes an electronic output amplifier 30 disposed downstream of the optical receiver 26 so as to amplify the electrical signal generated by the optical receiver 26.

The radio-on-fiber transmission system 12 is here also configured for the transmission of a radio signal transmitted by the radiocommunication device 6 to the radio antenna 8 with a view to its radiation.

To do this, the electro-optical converter 18 of the submarine 2 is configured to convert a radioelectric signal emitted by the radiocommunication device 6 into a corresponding optical signal and send it to the electro-optical converter 16 of the buoy 10 via the optical link 14, the electro-optical converter 16 of the buoy 10 being configured to reconstruct the radio signal from the optical signal.

In the example illustrated, the electro-optical converter 18 of the submarine 2 and the electro-optical converter 16 of the buoy 10 respectively comprise an electrical / optical conversion stage 32 and an optical / electrical conversion stage 34 for the transmission a radio signal emitted by the radiocommunication device 6 to the radio antenna 8.

The electrical / optical conversion stage 32 of the electro-optical converter 18 of the submarine 2 is for example similar to that of the electro-optical converter 16 of the buoy 10 described above.

The electrical / optical conversion stage 32 here comprises an optical transmitter 36, for example a light-emitting diode, electrically coupled to the radiocommunication device 6 and optically to the electro-optical converter 16 of the buoy 10 via the optical link 14.

The electrical / optical conversion stage 32 optionally includes an electronic amplifier 38 upstream of the optical transmitter 36, for example an LNA amplifier.

The optical / electrical conversion stage 34 of the electro-optical converter 16 of the buoy 10 is for example similar to that of the electro-optical converter 18 of the submarine 2 described above.

The optical / electrical conversion stage 34 here comprises an optical receiver 40 optically coupled to the electro-optical submarine converter 16 via the fiber optic link 14 and electrically to the radio antenna 8.

The optical / electrical conversion stage 34 optionally includes an electronic output amplifier 42 downstream of the optical receiver 40 to amplify the electrical radio signal reconstituted from the optical signal before its application as an input to the radio antenna 8.

In operation, for the reception of a radio signal, the radiocommunication system 4 implements a radiocommunication method comprising:

- the capture of a radio signal by the radio antenna 8;

the conversion of the radio signal received by the radio antenna 8 into an optical signal corresponding to the aid of the electro-optical converter 16 of the buoy 10, more specifically by means of the electrical / optical conversion stage 20;

- Transmission of the optical signal from the buoy 10 to the submarine 2 via the fiber optic link 14 connecting the buoy 10 to the submarine 2;

the conversion of the optical signal into an electrical signal using the electro-optical converter 18 of the submarine 2 to reconstruct the radio signal, more precisely using the optical / electrical conversion stage 24; and

- the sending of the radio signal at the input of the radiocommunication device 6.

In operation, for the transmission of a radio signal, the radiocommunication system 4 implements a radiocommunication method comprising:

- the emission of a radio signal by the radiocommunication device 6;

the conversion of the radio signal emitted by the radiocommunication device 6 into an optical signal using the electro-optical converter 18 of the submarine 2, more precisely using the electrical / optical conversion stage 34 ;

- transmission of the optical signal from the submarine 2 to the buoy 10 via the fiber optic link 14;

the conversion of the optical signal into an electrical signal using the electro-optical converter 16 of the buoy 10 to reconstruct the radio signal, more precisely using the optical / electrical conversion stage 36; and

- transmission of the radio signal to the radio antenna 8 for transmission.

The radio-on-fiber transmission system 12 is here bidirectional, since it allows a transmission of a radio signal from the radio antenna 8 to the radiocommunication device 6 (reception) and the transmission of a radio signal from the radiocommunication device 6 to the radio antenna 8 (transmission).

In variants, the radio-on-fiber transmission system 12 is monodirectional. It is then configured only for one of the reception and emission of radio signals. In this case, the electrooptical converters 16, 18 can be unidirectional.

In a variant, the radio-on-fiber transmission system 12 is configured only for the reception of radio signals. In this case, the electro-optical converter 16 of the buoy 10 can be devoid of optical / electrical conversion stage and / or the electro-optical submarine converter can be devoid of electrical / optical conversion stage.

In another variant, the radio-on-fiber transmission system 12 is configured only for the transmission of radioelectric signals. In this case, the electro-optical converter 16 of the buoy 10 can be devoid of electrical / optical conversion stage and / or the electro-optical converter 18 of submarine 2 can be devoid of optical / electrical conversion stage .

In all cases, at least one, and preferably each, of the electro-optical converter 16 of the buoy 10 and the electro-optical converter 18 of the submarine 2 is configured to perform the reverse conversion of each conversion carried out by the other.

The radio signal is transmitted between the electro-optical converter 16 of the buoy 10 and the electro-optical converter 18 of the submarine 2 in the form of an optical signal, before being reconstituted in the form of an electric signal .

In one embodiment, the optical signal is formed by an optical carrier modulated by the radio signal. Modulation is for example amplitude modulation, phase modulation or frequency modulation.

In the example illustrated, the electrical / optical conversion is carried out by means of a light-emitting diode used as an optical transmitter and at the input of which the radio signal is applied. This is a so-called "direct" conversion. The optical carrier, generated by the light-emitting diode, is amplitude modulated by the radio signal.

Alternatively, the radio signal is converted to an electrical signal at an intermediate frequency which is used to modulate the optical carrier. This type of radio-to-fiber transmission is also called intermediate frequency fiber transmission (or IFoF for "Intermediate Frequency over Fiber" in English).

In the illustrated embodiment, the radio antenna 8 carried by the buoy 10 is used for the reception and transmission of radio signals.

The electro-optical converter 16 of the buoy 10 here comprises a mode selector 44 making it possible to electrically connect the radio antenna 8 selectively to the input of the electrical / optical conversion stage 22 or to the output of the conversion stage optical / electrical conversion 34.

In a variant, the buoy 10 comprises a radio antenna 8 for receiving to receive the radio signals and a radio antenna 8 for transmitting the radio signals, which are separate.

In this case, the receiving radio antenna 8 is for example electrically connected to the input of the electrical / optical conversion stage 22, and the transmitting radio antenna 8 is connected to the output of the conversion stage optical / electrical conversion 34.

In one embodiment, and as illustrated in FIGS. 1 and 2, the radiocommunication system 4 comprises several radiocommunication devices 6 on board the submarine, sharing the radio-on-fiber transmission system 12 for the transmission of signals between each radiocommunication device 6 and the buoy 10. The submarine 2 here comprises three radiocommunication devices 6.

Each radiocommunication device 6 is for example chosen from the following group: a VHF transmitter / receiver, a UHF transmitter / receiver, a satellite radionavigation receiver, terminal equipment of a cellular telecommunications network or terminal equipment of a network satellite communications.

When the submarine 2 comprises several radiocommunication devices 6, advantageously, the submarine 2 comprises at least two different radiocommunication devices 6.

The radiocommunication system 4 comprises an apparatus selector 46 configured to selectively connect one radiocommunication apparatus 6 at a time to the radio-on-fiber transmission system 12.

Optionally, the device selector 46 is configured to adapt the power of the radio signals received or transmitted as a function of the radiocommunication device 6 which is connected to the radio-on-fiber transmission system 12.

As an option, the electro-optical converter 18 of the submarine 2 includes a mode selector 48 configured to selectively connect the electrical / optical stage 32 or the optical / electrical stage 24 to the radiocommunication device 6 as appropriate. receive or transmit a radio signal.

Advantageously, and as in the example illustrated, the submarine 2 comprises several radiocommunication devices 6 sharing the same radio antenna 8 for transmitting and / or receiving radiocommunication signals. In this case, preferably, the radio antenna 8 is a broadband radio antenna 8. The radio antenna 8 covers one or more octaves. The radio antenna 8 covers for example the frequency range from 100 to 400 MHz and / or the frequency range 400 MHz to 1 GHz, or more depending on its design. This makes it possible to use different radio communication devices 6 using different frequency bands, while sharing the same radio antenna 8.

As a variant or as an option, the buoy 10 comprises several radio antennas 8 configured to operate in different frequency ranges, the radiocommunication system 4 comprising an antenna selector making it possible to connect the electro-optical converter 16 of the buoy 10 selectively to the 'one of the radio antennas 8, depending on the radiocommunication device 6 receiving or transmitting a radio signal.

In one embodiment, the radio-on-fiber transmission system 12 is configured for the transmission of optical signals from the buoy 10 to the submarine 2 and from the submarine to the buoy 10 via the same fiber or fibers ( s) optics.

In a variant, the optical fiber link 14 may comprise one or more first optical fibers dedicated to the transmission of signals from the electrooptical converter 16 of the buoy 10 to the electro-optical converter 18 of the submarine 2, and one or more second optical fibers dedicated to the transmission of optical signals from the submarine electro-optical converter 16 to the buoy optical electro3058385 converter 18, the first optical fibers being distinct from the second optical fibers.

The radiocommunication system 4 using a radio-fiber transmission system 12 between a buoy 10 carrying a radio antenna 8 and a radiocommunication device 6 on board the submarine 2 is transparent to the radiocommunication device 6.

In particular, encrypted or unencrypted radio signals can be transmitted through the radio-over-fiber system 12 in the same manner. The radiocommunication system can therefore equally comprise radiocommunication apparatuses 6 transmitting and / or receiving encrypted or unencrypted radioelectric signals. It is therefore not necessary for the buoy 10 to carry a device for encryption and / or decryption of radioelectric signals. This is all the more advantageous when the buoy 10 is for single use and abandoned after use, since it can then be recovered by third parties.

The radiocommunication device 6 can receive and / or transmit a radio signal as if it were connected directly to a radio antenna 8. It is compatible with radiocommunication devices 6 of different types, and can be used simultaneously for several types of radiocommunication device 6. It can be easily adapted on a submarine 2 already equipped with radiocommunication devices 6, without any particular adaptation.

In addition, the buoy 10 carries simple and inexpensive electronics, which is essentially limited to the electro-optical converter 16 of the buoy 10 carrying out a conversion between an electrical signal and a corresponding optical signal, without processing the radio signal to extract therefrom. data. In particular, buoy 10 does not carry a radio receiver, radio transmitter or processing unit for signal shaping. Thus, this reduces the cost of buoy 10.

The buoy 10 equipped with the radio antenna 8 and the electrooptical converter 16 of the buoy 10, on the one hand, and the submarine equipped with the electrooptical converter 18 of the submarine 2, on the other hand, can be supplied separately .

Claims (10)

1. -Submarine radiocommunication system, comprising at least one radiocommunication device (6) on board a submarine, at least one radio antenna (8) carried by a buoy (10), and a system of radio-surfibre transmission (12) configured for the transmission, via a fiber optic link (14) connecting the buoy (10) to the submarine (2), of radio signals between the radio antenna (8) and the device radio communication (6). 2. - Radiocommunication system according to claim 1, in which the radio-on-fiber transmission system (12) comprises an electro-optical converter (16) carried by the buoy (10), and configured to convert a radio signal received by the radio antenna (8) into a corresponding optical signal and / or to convert an optical signal into a corresponding radio signal and transmit it to the radio antenna (8) for radiation. 3. - Radiocommunication system according to claim 2, in which the radio-on-fiber transmission system (12) comprises an electro-optical converter (18) located on board the submarine (2), optically coupled to the electro converter - buoy optics (16) via the fiber optic link (14) and electrically coupled to the radiocommunication device ^), the electro-optical submarine converter (18) being configured to perform the reverse conversion of each conversion produced by the electro-optical converter (16) of the buoy (10). 4. - Radiocommunication system according to any one of the preceding claims, in which the radiocommunication device (6) is chosen from the following group: a VHF transmitter / receiver, a UHF transmitter / receiver, a satellite radionavigation receiver , a terminal of a cellular telecommunications network or a terminal of a satellite telecommunications network. 5. - Radiocommunication system according to any one of the preceding claims, comprising at least two separate radiocommunication devices (6) on board the submarine (2), each radiocommunication device being connected to the radio antenna (8) via the radio-on-fiber transmission system (12) for receiving and / or transmitting radioelectric signals. 6. - Submarine (2) equipped with a radio communication system according to any one of the preceding claims. 7. - Buoy (10) for radio communication for submarines (2), carrying at least one radio antenna (8) and an electro-optical converter (16) configured to convert a radio signal picked up by the radio antenna (8 ) into a corresponding optical signal and / or to convert an optical signal into a corresponding radio signal and transmit it to the radio antenna (8) for radiation. 8. - Submarine (2) comprising at least one radiocommunication device (6) configured for the reception and / or the emission of radioelectric signals, and an electro-optical converter (18) located on board the submarine ( 2) and configured to convert a radio signal transmitted by the radiocommunication device (6) into a corresponding optical signal and / or to convert a received optical signal into a corresponding radio signal and send it to the radiocommunication device (6 ). 9. - Radiocommunication method for submarine (2) equipped with a radiocommunication system (4) comprising at least one radiocommunication device (6) located on board the submarine (2) and a radio antenna (8) carried by a buoy (10), the radiocommunication method comprising: - capturing a radio signal using the radio antenna (8); - the conversion of the radio signal received into an optical signal corresponding to the aid of an electro-optical converter (16) carried by the buoy (10); - transmission of the optical signal from the buoy (10) to the submarine (2) via a fiber optic link (14) connecting the buoy (10) to the submarine (2); - converting the optical signal into an electrical signal using an electro-optical converter (18) located on board the submarine (2) to reconstruct the radio signal; and - sending the reconstituted radio signal to the radiocommunication device (6). 10. - Radiocommunication method for submarine (2) equipped with a radiocommunication system (4) comprising at least one radiocommunication device (6) located on board the submarine (2) and a radio antenna (8) carried by a buoy (10), the radiocommunication method comprising: - the emission of a radio signal by the radiocommunication device (6); - converting the radio signal emitted into an optical signal using an electro-optical converter (18) located on board the submarine (2); - transmission of the optical signal from the submarine (2) to the buoy (10) via a fiber optic link (14) connecting the submarine (2) to the buoy (10); - converting the optical signal into an electrical signal using an electro-optical converter (16) carried by the buoy (10) to reconstruct the radio signal; and - sending the reconstituted radio signal to the radio antenna (8) for its radiation. 1/2 2/2 ΓΜ ΓΜ CM CM