CN112217562B - Underwater monitoring optical transmission system - Google Patents
Underwater monitoring optical transmission system Download PDFInfo
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- CN112217562B CN112217562B CN202010946500.XA CN202010946500A CN112217562B CN 112217562 B CN112217562 B CN 112217562B CN 202010946500 A CN202010946500 A CN 202010946500A CN 112217562 B CN112217562 B CN 112217562B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
- H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
- H04B10/079—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using measurements of the data signal
- H04B10/0797—Monitoring line amplifier or line repeater equipment
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/564—Power control
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/80—Optical aspects relating to the use of optical transmission for specific applications, not provided for in groups H04B10/03 - H04B10/70, e.g. optical power feeding or optical transmission through water
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0221—Power control, e.g. to keep the total optical power constant
Abstract
The invention discloses an underwater monitoring optical transmission system, which comprises: the device comprises a transmitting end, a receiving end and a transmission link for connecting the transmitting end and the receiving end; the transmission link comprises a first link and a second link; the first link is used for transmitting a first optical signal sent by the transmitting end to the underwater detection unit through a first amplification unit, a first transmission unit, a composite remote gain unit and a second transmission unit which are connected in sequence; the second link is used for transmitting the second optical signal to the receiving end through a third transmission unit, a composite remote gain unit, a fourth transmission unit and a second amplification unit which are connected in sequence; the composite remote gain unit is commonly used by the first link and the second link, and is used for increasing the optical power of the second optical signal based on the first pump light provided by the first amplifying unit and the second pump light provided by the second amplifying unit, so that the transmission distance between the composite remote gain unit and the receiving end can be increased.
Description
Technical Field
The invention relates to the technical field of optical communication, in particular to an underwater monitoring optical transmission system.
Background
With the continuous development of world economy, the maintenance of ocean interests is paid more and more attention and attention by various countries, wherein the underwater sound monitoring and transmitting system based on coastline distribution can accurately monitor the change of the surrounding environment in real time and is widely used for monitoring the seabed and rivers. Because the underwater sound monitoring and transmitting system takes the optical signal in the optical communication technology as the transmission signal, the length of the transmission distance of the transmission signal determines the farthest monitoring coverage range of the underwater sound monitoring and transmitting system, so that the improvement of the transmission distance of the optical signal in the underwater sound monitoring and transmitting system has very important practical significance for expanding the monitoring coverage range. The underwater acoustic monitoring transmission system belongs to a non-relay ultra-long distance optical communication system, and the current underwater acoustic monitoring transmission system based on long distance communication is shown in figure 1, the underwater sound monitoring and transmitting system adopts a remote pump amplification technology to greatly improve the transmission distance of optical signals in the underwater sound monitoring and transmitting system, on the premise that the communication quality is not deteriorated, the farther a Remote Gain Unit (RGU) is placed from the receiving end, the farther the transmission distance of the supportable optical signal will be, but since the RGU requires a pump light power of at least 7 Megawatts (MW) to operate, and due to the nonlinear effects of the fiber, the power of the pump light initially entering the fiber cannot be too high, this results in the restriction of the farthest placement of the RGU in the line, which is unlikely to be far from the receiving end, and greatly limits the communication distance of the underwater acoustic monitoring transmission system.
Disclosure of Invention
In view of the above, the present invention provides an underwater monitoring optical transmission system, which can solve the problem that the position of a remote gain unit in an existing underwater monitoring optical transmission system is not far enough from a receiving end.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
the embodiment of the invention provides an underwater monitoring optical transmission system, which comprises: the device comprises a transmitting end, a receiving end and a transmission link for connecting the transmitting end and the receiving end; the transmission link comprises a first link and a second link; wherein the content of the first and second substances,
the first link is used for transmitting a first optical signal sent by the transmitting end to the underwater detection unit through a first amplification unit, a first transmission unit, a composite remote gain unit and a second transmission unit which are connected in sequence;
the second link is used for transmitting a second optical signal to the receiving end through a third transmission unit, the composite remote gain unit, a fourth transmission unit and a second amplification unit which are connected in sequence;
wherein the composite remote gain unit is commonly used by the first link and the second link, and is configured to increase optical power of the second optical signal based on the first pump light provided by the first amplification unit and the second pump light provided by the second amplification unit, so that a transmission distance between the composite remote gain unit and the receiving end can be increased; the second optical signal is obtained by the underwater detection unit based on the detected outside signal and the received first optical signal; the external signal is a specific signal for indicating the type of the underwater object.
In the above aspect, the complex remote gain unit includes: a first wavelength division multiplexer, a first wavelength division multiplexing isolator, a second wavelength division multiplexer, a second wavelength division multiplexing isolator and an erbium-doped fiber, wherein,
the first wavelength division multiplexer is configured to receive the first pump light and the first optical signal transmitted by the first transmission unit, transmit the first optical signal to the underwater detection unit through a second transmission unit, and transmit the first pump light to the first wavelength division multiplexing isolator;
the first wavelength division multiplexing isolator is used for receiving the first pump light and transmitting the first pump light to the erbium-doped fiber;
a second wavelength division multiplexing isolator for receiving the second pump light transmitted through the fourth transmission unit and transmitting the second pump light to the second wavelength division multiplexer;
the second wavelength division multiplexer is used for receiving the second pumping light and transmitting the second pumping light to the erbium-doped fiber;
the erbium-doped fiber is configured to receive the second optical signal, the first pump light, and the second pump light, and increase optical power of the second optical signal based on the first pump light and the second pump light, so that a transmission distance between the composite remote gain unit and the receiving end can be increased;
the second optical signal is transmitted to the erbium-doped fiber through the third transmission unit and the first wavelength division multiplexing isolator in sequence; and transmitting the second optical signal with increased power to the receiving end sequentially through a second wavelength division multiplexer, the second wavelength division multiplexing isolator and the fourth transmission unit.
In the above aspect, the complex remote gain unit includes: a first wavelength division multiplexer, a first wavelength division multiplexing isolator, a second wavelength division multiplexer, a second wavelength division multiplexing isolator and an erbium-doped fiber, wherein,
the first wavelength division multiplexer is configured to receive the first pump light and the first optical signal transmitted by the first transmission unit, transmit the first optical signal to the underwater detection unit by a second transmission unit, and transmit the first pump light to the second wavelength division multiplexer;
the second wavelength division multiplexer is used for receiving the first pumping light and transmitting the first pumping light to the erbium-doped fiber;
the second wavelength division multiplexing isolator is used for receiving the second pump light transmitted by the fourth transmission unit and transmitting the second pump light to the first wavelength division multiplexing isolator;
the first wavelength division multiplexing isolator is used for receiving the second pump light and transmitting the second pump light to the erbium-doped fiber;
the erbium-doped fiber is configured to receive the second optical signal, the first pump light, and the second pump light, and increase optical power of the second optical signal based on the first pump light and the second pump light, so that a transmission distance between the composite remote gain unit and the receiving end can be increased;
the second optical signal is transmitted to the erbium-doped fiber through the third transmission unit and the first wavelength division multiplexing isolator in sequence; and transmitting the second optical signal with increased power to the receiving end sequentially through a second wavelength division multiplexer, the second wavelength division multiplexing isolator and the fourth transmission unit.
In the above aspect, the complex remote gain unit includes: a first wavelength division multiplexer, a second wavelength division multiplexer, a third wavelength division multiplexing isolator and an erbium-doped fiber, wherein,
the first wavelength division multiplexer is configured to receive the first pump light and the first optical signal transmitted by the first transmission unit, transmit the first optical signal to the underwater detection unit through a second transmission unit, and transmit the first pump light to the third wavelength division multiplexer;
the third wavelength division multiplexer is used for receiving the first pumping light and transmitting the first pumping light to the second wavelength division multiplexer;
the second wavelength division multiplexer is used for receiving the first pumping light and transmitting the first pumping light to the erbium-doped fiber;
the third wavelength division multiplexing isolator is configured to receive the second pump light transmitted by the fourth transmission unit and transmit the second pump light to the second wavelength division multiplexer;
the second wavelength division multiplexer is used for receiving the second pumping light and transmitting the second pumping light to the erbium-doped fiber;
the erbium-doped fiber is configured to receive the second optical signal, the first pump light, and the second pump light, and increase optical power of the second optical signal based on the first pump light and the second pump light, so that a transmission distance between the composite remote gain unit and the receiving end can be increased;
wherein the second optical signal is transmitted to the erbium-doped fiber through the third transmission unit; and transmitting the second optical signal with increased power to the receiving end sequentially through a second wavelength division multiplexer, the third wavelength division multiplexing isolator and the fourth transmission unit.
In the above solution, the complex remote gain unit further comprises: and the optical isolator is used for receiving the second optical signal transmitted by the third transmission unit and ensuring that the second optical signal is transmitted to the erbium-doped optical fiber in a single direction.
In the above aspect, the complex remote gain unit includes: a first wavelength division multiplexer, a second wavelength division multiplexer, a first wavelength division multiplexing isolator, a second wavelength division multiplexing isolator and an erbium-doped fiber, wherein,
the first wavelength division multiplexer is configured to receive the first pump light and the first optical signal transmitted by the first transmission unit, transmit the first optical signal to the underwater detection unit by a second transmission unit, and transmit the first pump light to the second wavelength division multiplexer;
the second wavelength division multiplexing isolator is configured to receive the second pump light transmitted by the fourth transmission unit and transmit the second pump light to the second wavelength division multiplexer;
the second wavelength division multiplexer is configured to receive the first pump light and the second pump light, and transmit the first pump light and the second pump light to the first wavelength division multiplexing isolator;
the first wavelength division multiplexing isolator is used for receiving the first pump light and the second pump light and transmitting the first pump light and the second pump light to the erbium-doped fiber;
the erbium-doped fiber is used for the second optical signal, the first pump light and the second pump light, and the optical power of the second optical signal is increased based on the first pump light and the second pump light, so that the transmission distance between the composite remote gain unit and the receiving end can be increased;
the second optical signal is transmitted to the erbium-doped fiber through the third transmission unit and the first wavelength division multiplexing isolator in sequence; and the second optical signal with increased power is transmitted to the receiving end sequentially through the second wavelength division multiplexing isolator and the fourth transmission unit.
In the above solution, the complex remote gain unit further comprises: and the reflector is positioned between the second wavelength division multiplexing isolator and the erbium-doped fiber and is used for reflecting the pump light which penetrates through the second wavelength division multiplexing isolator.
In the above scheme, the lengths of the first transmission unit and the fourth transmission unit are equal; and the lengths of the first transmission unit and the fourth transmission unit satisfy:
wherein, PDIs the power, P, of the pump light generated in the first amplification unit in the first chainUThe power of the pump light generated in the second amplification unit in the second link; Δ is the transmission loss of the pump light relative to the optical signal; alpha is alphaDThe total loss of the optical signal is the total loss of the optical signal during the transmission of the first transmission unit and the second transmission unit in the first link; alpha is alphaUThe total loss of the optical signal during transmission in the third transmission unit and the fourth transmission unit in the second link is obtained; l is the length of the first transmission unit or the fourth transmission unit.
In the above scheme, the first amplifying unit includes a first sub-amplifier and a second sub-amplifier; the second amplifying unit comprises a third sub-amplifier and a fourth sub-amplifier;
wherein the first sub-amplifier and the fourth sub-amplifier are erbium-doped fiber amplifiers; the second sub-amplifier and the third sub-amplifier are Raman amplifiers.
In the above scheme, the length range of the erbium-doped fiber is as follows: 16 m-25 m, the gain spectrum range is as follows: 1530nm to 1570 nm.
The embodiment of the invention provides an underwater monitoring optical transmission system, which comprises: the device comprises a transmitting end, a receiving end and a transmission link for connecting the transmitting end and the receiving end; the transmission link comprises a first link and a second link; the first link is used for transmitting a first optical signal sent by the transmitting end to the underwater detection unit through a first amplification unit, a first transmission unit, a composite remote gain unit and a second transmission unit which are connected in sequence; the second link is used for transmitting a second optical signal to the receiving end through a third transmission unit, the composite remote gain unit, a fourth transmission unit and a second amplification unit which are connected in sequence; wherein the composite remote gain unit is commonly used by the first link and the second link, and is configured to increase optical power of the second optical signal based on the first pump light provided by the first amplification unit and the second pump light provided by the second amplification unit, so that a transmission distance between the composite remote gain unit and the receiving end can be increased; the second optical signal is obtained by the underwater detection unit based on the detected outside signal and the received first optical signal; the external signal is a specific signal for indicating the type of the underwater object. In the underwater monitoring optical transmission system, the composite remote gain unit used by the first link and the second link can increase the optical power of the second optical signal through the pump light on the two links, so that the distance which can be transmitted by the second optical signal is increased, and thus, the transmission distance between the composite remote gain unit and the receiving end can be increased, the communication distance of the underwater monitoring optical transmission system is greatly prolonged, and the monitoring range of the underwater monitoring system is widened.
Drawings
Fig. 1 is a schematic structural diagram of a conventional underwater acoustic monitoring transmission system;
fig. 2 is a first schematic structural diagram of an underwater monitoring optical transmission system provided in an embodiment of the present invention;
fig. 3 is a schematic structural diagram ii of an underwater monitoring optical transmission system according to an embodiment of the present invention;
fig. 4 is a first schematic structural diagram of a composite remote gain unit in an underwater monitoring optical transmission system according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a composite remote gain unit in the underwater monitoring optical transmission system according to the embodiment of the present invention;
fig. 6 is a schematic structural diagram three of a composite remote gain unit in the underwater monitoring optical transmission system according to the embodiment of the present invention;
fig. 7 is a schematic structural diagram of a composite remote gain unit in the underwater monitoring optical transmission system according to the embodiment of the present invention.
Wherein, TX is a transmitting end; RX is the receiving end; 1 and 7 are power amplifying units; 2. 4, 6 are transmission optical fibers; 3 is an underwater sound detector; 5 is a remote gain unit;
201-first link; 202-a second link; 203-a first amplification unit; 2031 — a first sub-amplifier; 2032 — a second sub-amplifier 2032; 204-a first transmission unit; 205-complex remote gain unit; 205 a-a first input port; 205 b-a first output port; 205 c-a second input port; 205 d-a second output port; 206-a second transmission unit; 207-underwater detection unit; 208-a third transmission unit; 209-a fourth transmission unit; 2010-a second amplification unit; 20101-a third sub-amplifier; 20102-a fourth sub-amplifier; 2051-first wavelength division multiplexer; 2051-1 is the common terminal of the first wavelength division multiplexer; 2051-2 is the transmission end of the first wavelength division multiplexer; 2051-3 is a reflection end of the first wavelength division multiplexer; 2052-first wavelength division multiplexing isolator; 2052-1 is the common port of the first wavelength division multiplexing isolator; 2052-2 is the reflection end of the first wavelength division multiplexing isolator; 2052-3 is the transmission end of the first wavelength division multiplexing isolator; 2053-second wavelength division multiplexing isolator; 2053-1 is the common terminal of the second wavelength division multiplexing isolator; 2053-2 is the transmission end of the second wavelength division multiplexing isolator; 2053-3 is the reflection end of the second wavelength division multiplexing isolator; 2054-a second wavelength division multiplexer; 2054-1 is the transmission end of the second wavelength division multiplexer; 2054-2 is the common terminal of the second wavelength division multiplexer; 2054-3 is a reflection end of the second wavelength division multiplexer; 2055-erbium doped fiber; 2056-a third wavelength division multiplexer; 2056-1 is the common terminal of the third wavelength division multiplexer; 2056-2 is a reflection end of the third wavelength division multiplexer; 2056-3 is the transmission end of the third wavelength division multiplexer; 2057-a third wavelength division multiplexing isolator; 2057-1 is the common terminal of the third wdm isolator; 2057-2 is the transmission end of the third wdm isolator; 2057-3 is the reflection end of the third wdm isolator; 2058-isolators; 2059-mirror.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the following describes specific technical solutions of the present invention in further detail with reference to the accompanying drawings in the embodiments of the present invention. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Fig. 2 is a first schematic structural diagram of an underwater monitoring optical transmission system according to an embodiment of the present invention. As shown in fig. 2, the system 20 includes: the device comprises a transmitting end, a receiving end and a transmission link for connecting the transmitting end and the receiving end; the transmission link comprises a first link 201 and a second link 202; wherein the content of the first and second substances,
the first link 201 is configured to transmit a first optical signal sent by the transmitting end to an underwater detection unit 207 through a first amplification unit 203, a first transmission unit 204, a composite remote gain unit 205, and a second transmission unit 206, which are connected in sequence;
the second link 202 is configured to transmit a second optical signal to the receiving end through a third transmission unit 208, the composite remote gain unit 205, a fourth transmission unit 209, and a second amplification unit 2010, which are connected in sequence;
wherein the composite remote gain unit 205 is commonly used by the first link 201 and the second link 202, and is configured to increase the optical power of the second optical signal based on the first pump light provided by the first amplification unit 203 and the second pump light provided by the second amplification unit 2010, so as to enable the transmission distance between the composite remote gain unit 205 and the receiving end to be increased; the second optical signal is obtained by the underwater detection unit 207 based on the detected outside signal and the received first optical signal; the external signal is a specific signal for indicating the type of the underwater object.
It should be noted that, in the underwater monitoring optical transmission system, the transmission process of the optical signal includes a transmission process in the first link and a transmission process in the second link, which may specifically be as follows:
transmission process in the first link: the transmitting end sends out a first optical signal, the first optical signal enters a first transmission unit for transmission for a distance after being amplified in power by the first amplification unit, enters the composite remote gain unit 205 for continuous transmission, and then is transmitted to the underwater detection unit 207 through a second transmission unit; it should be noted that the first optical signal is amplified by the pump light generated in the first amplifying unit, and it should be understood that a part of the pump light generated by the first amplifying unit is used for amplifying the first optical signal, and another part of the pump light is the aforementioned first pump light, and may also be residual pump light, that is, a part of the pump light generated by the first amplifying unit is used for amplifying the first optical signal, and another part of the residual pump light (the first pump light) passes through the first transmitting unit, enters the composite remote gain unit 205, and amplifies the power of the subsequent second optical signal in the composite remote gain unit 205;
the underwater detection unit 207 superimposes the detected external signal on the transmitted first optical signal to form a second optical signal, the second optical signal enters the composite remote gain unit 205 through the third transmission unit, the composite remote gain unit 205 increases the power of the second optical signal based on the first pump light and the second pump light, and then the second optical signal with increased power is transmitted to the receiving end sequentially through the fourth transmission unit and the second amplification unit. Since the power of the second optical signal is increased in the subsequent transmission process, the transmission distance of the second optical signal is increased, in this case, the distance between the composite remote gain unit 205 and the receiving end may be larger, and it can be said that the length of the fourth transmission unit 209 here may be longer, that is: the composite remote gain unit 205 can be placed at a position farther from the receiving end, so as to extend the communication distance of the underwater monitoring optical transmission system and widen the monitoring range of the underwater monitoring system.
It should be noted that the aforementioned first link 201 may also be referred to as a downlink, and is used for transmitting the first optical signal sent by the transmitting end 201 to the underwater detection unit 207. The second link 202 may also be referred to as an uplink for transmitting the second optical signal to the receiving end; the underwater detection unit 207 may be an array of fiber optic hydrophones, which are used to monitor external signals underwater. The external signal is a specific signal used for indicating the type of the underwater object; the specific signal may be an acoustic signal.
As an alternative embodiment, as shown in fig. 3, the first amplifying unit 203 may include a first sub-amplifier 2031 and a second sub-amplifier 2032; the second amplification unit 2010 may include a third sub-amplifier 20101 and a fourth sub-amplifier 20102; the first sub-amplifier 2031 and the fourth sub-amplifier 20102 are erbium-doped fiber amplifiers; the second sub-amplifier 2032 and the third sub-amplifier 20101 are raman amplifiers.
Here, when the first sub-amplifier 2031 and the fourth sub-amplifier 20102 are erbium-doped fiber amplifiers, the wavelength range of operation of the erbium-doped fiber amplifier may be: 1528 nanometers (nm) to 1562 nm; when the second sub-amplifier 2032 and the third sub-amplifier 20101 are raman amplifiers, the wavelength range of the pump light generated by the raman amplifiers may be: 1465nm to 1480nm, wherein the second sub-amplifier 2032 and the third sub-amplifier 20101 may further be remote pumping units, and in this case, the wavelength range of the pump light generated by the remote pumping units is also: 1465 nm-1480 nm. Further, the saturated output power of the first sub-amplifier 2031 may be 23 milliwatt decibels (dBm); the switching gains of the second sub-amplifier 2032 and the third sub-amplifier 20101 may be 10-20 decibels (dB); the noise figure of the fourth sub-amplifier 20102 may be 4dB to 5 dB. The complex remote gain unit 205 is connected to the first transmission unit via a first input port (205a), to the second transmission unit via a first output port (205b), to the third transmission unit via a second input port (205c) and to the fourth transmission unit via a second output port (205d), respectively.
In practical application, the transmitting end and the receiving end of the underwater monitoring optical transmission system may be disposed on the same device, or disposed on different devices, where the transmitting end and the receiving end are disposed on the same device as shown in fig. 1 to 3.
In the case where the first transmission unit and the fourth transmission unit are in the same device, the lengths of the first transmission unit and the fourth transmission unit may be equal; and the lengths of the first transmission unit and the fourth transmission unit satisfy the following relational expression:
wherein, PDIs the power, P, of the pump light generated in the first amplification unit in the first chainUThe power of the pump light generated in the second amplification unit in the second link; Δ is the transmission loss of the pump light in the optical fiber relative to the optical signal; alpha is alphaDThe total loss of the optical signal is the total loss of the optical signal during the transmission of the first transmission unit and the second transmission unit in the first link; alpha is alphaUThe total loss of the optical signal during transmission in the third transmission unit and the fourth transmission unit in the second link is obtained; l is the length of the first transmission unit or the fourth transmission unit.
Here, Δ may be generally taken to be 0.023 dB; alpha is alphaDAnd alphaUFor the cable loss, the value can be referred to a data sheet (datasheet) of the cable. It is to be noted that the above formula is adopted to obtainThe length L of the first transmission unit or the fourth transmission unit is such that the performance of the complex remote gain unit is optimal, so that at this length the distance of the system transmission can be made the farthest.
In practical applications, the composite remote gain unit may be one of a bidirectional pump gain unit, a forward pump gain unit, and a backward pump gain unit.
It should be noted that the bidirectional pump gain unit may refer to a pump gain unit that includes two pump lights entering the erbium-doped fiber from two different directions; the forward pumping gain unit can be a pumping gain unit which comprises an optical signal and pumping light which enter the erbium-doped fiber in the same direction; backward pump gain cells may refer to pump gain cells that contain optical signals and pump light entering an erbium doped fiber from two different directions.
As an alternative to the bi-directional pump gain unit, as shown in fig. 4, the complex remote gain unit 205 may include: a first wavelength division multiplexer 2051, a first wavelength division multiplexing isolator 2052, a second wavelength division multiplexer 2054, a second wavelength division multiplexing isolator 2053, and an erbium doped fiber 2055, wherein,
the first wavelength division multiplexer is configured to receive the first pump light and the first optical signal transmitted by the first transmission unit, transmit the first optical signal to the underwater detection unit through a second transmission unit, and transmit the first pump light to the first wavelength division multiplexing isolator;
the first wavelength division multiplexing isolator is used for receiving the first pump light and transmitting the first pump light to the erbium-doped fiber;
a second wavelength division multiplexing isolator for receiving the second pump light transmitted through the fourth transmission unit and transmitting the second pump light to the second wavelength division multiplexer;
the second wavelength division multiplexer is used for receiving the second pumping light and transmitting the second pumping light to the erbium-doped fiber;
the erbium-doped fiber is configured to receive the second optical signal, the first pump light, and the second pump light, and increase optical power of the second optical signal based on the first pump light and the second pump light, so that a transmission distance between the composite remote gain unit and the receiving end can be increased;
the second optical signal is transmitted to the erbium-doped fiber through the third transmission unit and the first wavelength division multiplexing isolator in sequence; and transmitting the second optical signal with increased power to the receiving end sequentially through a second wavelength division multiplexer, the second wavelength division multiplexing isolator and the fourth transmission unit.
It should be noted that the first wavelength division multiplexer 2051 includes a common terminal 2051-1, a transmitting terminal 2051-2, and a reflecting terminal 2051-3; the first wavelength division multiplexing isolator 2052 comprises a common port 2052-1, a reflective port 2052-2 and a transmissive port 2052-3; the second wavelength division multiplexer 2054 comprises a transmitting end 2054-1, a common end 2054-2 and a reflecting end 2054-3; the second wavelength division multiplexing isolator 2053 includes a common port 2053-1, a transmissive port 2053-2, and a reflective port 2053-3.
Thus, when the composite remote gain unit with the structure is adopted in the underwater monitoring optical transmission system, the transmission process of the first optical signal, the first pump light, the second pump light and the second optical signal in the composite remote gain unit is as follows:
the transmission path of the first optical signal is: enters the common end 2051-1 of the first wavelength division multiplexer 2051 from the first transmission unit, and then continues to pass through the transmission end 2051-2 of the first wavelength division multiplexer 2051 and is transmitted to the underwater detection unit through the second transmission unit;
the transmission path of the first pump light is: enters the common end 2051-1 of the first wavelength division multiplexer 2051 from the first transmission unit, then enters the reflecting end 2052-2 of the first wavelength division multiplexing isolator 2052 through the reflecting end 2051-3 of the first wavelength division multiplexer 2051, and then enters the erbium-doped fiber 2055 through the common end 2052-1 of the first wavelength division multiplexing isolator 2052;
the transmission path of the second optical signal is: a second optical signal generated by the underwater detection unit enters a transmission end 2052-3 of the first wavelength division multiplexing isolator 2052 through a third transmission unit, and then enters the erbium-doped fiber 2055 through a common end 2052-1 of the first wavelength division multiplexing isolator 2052, in the erbium-doped fiber 2055, the optical power of the second optical signal is increased based on the first pump light and the second pump light, and the second optical signal with increased power is transmitted to the receiving end sequentially through a second wavelength division multiplexer 2054, the second wavelength division multiplexing isolator 2053 and the fourth transmission unit;
the transmission path of the second pump light is: enters the common end 2053-1 of the second wavelength division multiplexing isolator 2053 from the fourth transmission unit, then enters the reflection end 2054-3 of the second wavelength division multiplexing isolator 2054 through the reflection end 2054-3 of the second wavelength division multiplexing isolator 2053, and then enters the erbium-doped fiber 2055 through the common end 2054-2 of the second wavelength division multiplexing isolator 2054.
Thus, according to the transmission paths of the first optical signal, the first pump light, the second optical signal and the second pump light, it can be known that the second optical signal and the first pump light enter the erbium-doped fiber in the same direction, and forward amplification is realized; the second optical signal and the second pump light reversely enter the erbium-doped optical fiber, so that backward amplification is realized, the composite remote gain unit can be placed at a position farther from the receiving end, and further transmission distance and monitoring range under water can be realized.
As another alternative to a bi-directional pump gain unit, as shown in fig. 5, the complex remote gain unit 205 may include: a first wavelength division multiplexer 2051, a first wavelength division multiplexing isolator 2052, a second wavelength division multiplexer 2054, a second wavelength division multiplexing isolator 2053, and an erbium doped fiber 2055, wherein,
the first wavelength division multiplexer is configured to receive the first pump light and the first optical signal transmitted by the first transmission unit, transmit the first optical signal to the underwater detection unit by a second transmission unit, and transmit the first pump light to the second wavelength division multiplexer;
the second wavelength division multiplexer is used for receiving the first pumping light and transmitting the first pumping light to the erbium-doped fiber;
the second wavelength division multiplexing isolator is used for receiving the second pump light transmitted by the fourth transmission unit and transmitting the second pump light to the first wavelength division multiplexing isolator;
the first wavelength division multiplexing isolator is used for receiving the second pump light and transmitting the second pump light to the erbium-doped fiber;
the erbium-doped fiber is configured to receive the second optical signal, the first pump light, and the second pump light, and increase optical power of the second optical signal based on the first pump light and the second pump light, so that a transmission distance between the composite remote gain unit and the receiving end can be increased;
the second optical signal is transmitted to the erbium-doped fiber through the third transmission unit and the first wavelength division multiplexing isolator in sequence; and transmitting the second optical signal with increased power to the receiving end sequentially through a second wavelength division multiplexer, the second wavelength division multiplexing isolator and the fourth transmission unit.
It should be noted that, when the composite remote gain unit 205 in fig. 5 is used in the underwater monitoring optical transmission system, the composite remote gain unit 205 in fig. 4 is different from the transmission path of the first pump light and the second pump light only, and the rest is the same.
Specifically, the transmission paths of the first pump light and the second pump light in the composite remote gain unit 205 in fig. 5 are respectively: the first pump light enters the common end 2051-1 of the first wavelength division multiplexer 2051 from the first transmission unit, then enters the reflection end 2054-3 of the second wavelength division multiplexer 2054 through the reflection end 2051-3 of the first wavelength division multiplexer 2051, and enters the erbium-doped fiber 2055 through the common end 2054-2 of the second wavelength division multiplexer 2054; the second pump light enters the common port 2053-1 of the second wavelength division multiplexing isolator 2053 from the fourth transmission unit, then enters the reflection port 2052-2 of the first wavelength division multiplexing isolator 2052 through the reflection port 2053-3 of the second wavelength division multiplexing isolator 2053, and then enters the erbium-doped fiber 2055 through the common port 2052-1 of the first wavelength division multiplexing isolator 2052.
Thus, according to the transmission paths of the first optical signal, the first pump light, the second optical signal and the second pump light, the second optical signal and the first pump light reversely enter the erbium-doped fiber, and backward amplification is realized; the second optical signal and the second pump light enter the erbium-doped optical fiber in the same direction, so that forward amplification is realized, the composite remote gain unit can be placed at a position farther from the receiving end, and further transmission distance and monitoring range under water can be realized.
As an alternative to the forward pump gain unit, as shown in fig. 6, the complex remote gain unit 205 may include: a first wavelength division multiplexer 2051, a second wavelength division multiplexer 2054, a third wavelength division multiplexer 2056, a third wavelength division multiplexer isolator 2057, and an erbium doped fiber 2055, wherein,
the first wavelength division multiplexer is configured to receive the first pump light and the first optical signal transmitted by the first transmission unit, transmit the first optical signal to the underwater detection unit through a second transmission unit, and transmit the first pump light to the third wavelength division multiplexer;
the third wavelength division multiplexer is used for receiving the first pumping light and transmitting the first pumping light to the second wavelength division multiplexer;
the second wavelength division multiplexer is used for receiving the first pumping light and transmitting the first pumping light to the erbium-doped fiber;
the third wavelength division multiplexing isolator is configured to receive the second pump light transmitted by the fourth transmission unit and transmit the second pump light to the second wavelength division multiplexer;
the second wavelength division multiplexer is used for receiving the second pumping light and transmitting the second pumping light to the erbium-doped fiber;
the erbium-doped fiber is configured to receive the second optical signal, the first pump light, and the second pump light, and increase optical power of the second optical signal based on the first pump light and the second pump light, so that a transmission distance between the composite remote gain unit and the receiving end can be increased;
wherein the second optical signal is transmitted to the erbium-doped fiber through the third transmission unit; and transmitting the second optical signal with increased power to the receiving end sequentially through a second wavelength division multiplexer, the third wavelength division multiplexing isolator and the fourth transmission unit.
It should be noted that the third wavelength division multiplexer 2056 includes a common terminal 2056-1, a reflection terminal 2056-2, and a transmission terminal 2056-3; the third wavelength division multiplexing isolator 2057 includes a common port 2057-1, a transmissive port 2057-2, and a reflective port 2057-3.
Thus, when the composite remote gain unit shown in fig. 6 is used in the underwater monitoring optical transmission system, the transmission process of the first optical signal, the first pump light, the second pump light, and the second optical signal in the composite remote gain unit is specifically as follows:
the transmission path of the first optical signal is: enters the common end 2051-1 of the first wavelength division multiplexer 2051 from the first transmission unit, and then continues to pass through the transmission end 2051-2 of the first wavelength division multiplexer 2051 and is transmitted to the underwater detection unit through the second transmission unit;
the transmission path of the first pump light is: enters the common end 2051-1 of the first wavelength division multiplexer 2051 from the first transmission unit, then enters the transmission end 2056-3 of the third wavelength division multiplexer 2056 through the reflection end 2051-3 of the first wavelength division multiplexer 2051, then enters the reflection end 2054-3 of the second wavelength division multiplexer 2054 through the common end 2056-1 of the third wavelength division multiplexer 2056, and enters the erbium-doped fiber 2055 through the common end 2054-2 of the second wavelength division multiplexer 2054;
the transmission path of the second optical signal is: a second optical signal generated by the underwater detection unit enters an erbium-doped fiber 2055 through a third transmission unit, in the erbium-doped fiber 2055, the optical power of the second optical signal is increased based on the first pump light and the second pump light, and the second optical signal with increased power is transmitted to the receiving end sequentially through a second wavelength division multiplexer 2054, a third wavelength division multiplexing isolator 2057 and a fourth transmission unit;
the transmission path of the second pump light is: enters the common end 2057-1 of the third wavelength division multiplexing isolator 2057 from the fourth transmission unit, then enters the reflection end 2056-2 of the third wavelength division multiplexing isolator 2056 through the reflection end 2057-3 of the third wavelength division multiplexing isolator 2057, then enters the reflection end 2054-3 of the second wavelength division multiplexing isolator 2054 through the common end 2056-1 of the third wavelength division multiplexing isolator 2056, and enters the erbium-doped fiber 2055 through the common end 2054-2 of the second wavelength division multiplexing isolator 2054.
Therefore, according to the transmission paths of the first optical signal, the first pump light, the second optical signal and the second pump light, the second optical signal, the first pump light and the second pump light reversely enter the erbium-doped fiber, backward amplification is achieved, the composite remote gain unit can be placed at a position farther from a receiving end, and therefore farther transmission distance and monitoring range under water can be achieved.
In some embodiments, the complex remote gain unit 205 further comprises: and an optical isolator 2058, configured to receive the second optical signal transmitted through the third transmission unit, and ensure that the second optical signal is transmitted to the erbium-doped fiber in a single direction.
At this time, the transmission path of the second optical signal is: the second optical signal generated by the underwater detection unit enters the erbium-doped fiber 2055 through the third transmission unit and the optical isolator 2058.
It should be noted that the optical isolator is used to improve the performance of the complex remote gain unit, and may affect whether the performance of the complex remote gain unit can be optimized, and ultimately, the transmission distance of the system.
As an alternative backward pumping gain unit, as shown in fig. 7, the complex remote gain unit 205 may include: a first wavelength division multiplexer 2051, a second wavelength division multiplexer 2054, a first wavelength division multiplexing isolator 2052, a second wavelength division multiplexing isolator 2053, and an erbium doped fiber 2055, wherein,
the first wavelength division multiplexer is configured to receive the first pump light and the first optical signal transmitted by the first transmission unit, transmit the first optical signal to the underwater detection unit by a second transmission unit, and transmit the first pump light to the second wavelength division multiplexer;
the second wavelength division multiplexing isolator is configured to receive the second pump light transmitted by the fourth transmission unit and transmit the second pump light to the second wavelength division multiplexer;
the second wavelength division multiplexer is configured to receive the first pump light and the second pump light, and transmit the first pump light and the second pump light to the first wavelength division multiplexing isolator;
the first wavelength division multiplexing isolator is used for receiving the first pump light and the second pump light and transmitting the first pump light and the second pump light to the erbium-doped fiber;
the erbium-doped fiber is used for the second optical signal, the first pump light and the second pump light, and the optical power of the second optical signal is increased based on the first pump light and the second pump light, so that the transmission distance between the composite remote gain unit and the receiving end can be increased;
the second optical signal is transmitted to the erbium-doped fiber through the third transmission unit and the first wavelength division multiplexing isolator in sequence; and the second optical signal with increased power is transmitted to the receiving end sequentially through the second wavelength division multiplexing isolator and the fourth transmission unit.
It should be noted that, when the composite remote gain unit with the above structure is adopted in the underwater monitoring optical transmission system, the transmission process of the first optical signal, the first pump light, the second pump light, and the second optical signal in the composite remote gain unit is specifically as follows:
the transmission path of the first optical signal is: enters the common end 2051-1 of the first wavelength division multiplexer 2051 from the first transmission unit, and then continues to pass through the transmission end 2051-2 of the first wavelength division multiplexer 2051 and is transmitted to the underwater detection unit through the second transmission unit;
the transmission path of the first pump light is: enters a common end 2051-1 of a first wavelength division multiplexer 2051 from a first transmission unit, then enters a transmission end 2054-1 of a second wavelength division multiplexer 2054 through a reflection end 2051-3 of the first wavelength division multiplexer 2051, enters a reflection end 2052-2 of a first wavelength division multiplexing isolator 2052 through a common end 2054-2 of the second wavelength division multiplexer 2054, and then enters an erbium-doped fiber 2055 through a common end 2052-1 of the first wavelength division multiplexing isolator 2052;
the transmission path of the second optical signal is: a second optical signal generated by the underwater detection unit enters a reflection end 2052-3 of a first wavelength division multiplexing isolator 2052 through a third transmission unit, and then enters an erbium-doped fiber 2055 through a common end 2052-1 of the first wavelength division multiplexing isolator 2052, in the erbium-doped fiber 2055, the optical power of the second optical signal is increased based on the first pump light and the second pump light, and the second optical signal with increased power is transmitted to the receiving end sequentially through the second wavelength division multiplexing isolator 2053 and the fourth transmission unit;
the transmission path of the second pump light is: enters the common end 2053-1 of the second wavelength division multiplexing isolator 2053 from the fourth transmission unit, then enters the reflection end 2054-3 of the second wavelength division multiplexing isolator 2054 through the reflection end 2053-3 of the second wavelength division multiplexing isolator 2053, enters the transmission end 2052-2 of the first wavelength division multiplexing isolator 2052 through the common end 2054-2 of the second wavelength division multiplexing isolator 2054, and then enters the erbium-doped fiber 2055 through the common end 2052-1 of the first wavelength division multiplexing isolator 2052.
Therefore, according to the transmission paths of the first optical signal, the first pump light, the second optical signal and the second pump light, it can be known that the second optical signal enters the erbium-doped fiber in the same direction as the first pump light and the second pump light, so that forward amplification is realized, the composite remote gain unit can be placed at a position farther from a receiving end, and further transmission distance and monitoring range under water can be realized.
In some embodiments, the complex remote gain unit 205 may further comprise: and a reflecting mirror 2059, which is located between the second wavelength division multiplexing isolator and the erbium-doped fiber, and is configured to reflect the pump light that has passed through the second wavelength division multiplexing isolator.
In this case, the transmission path of the second optical signal after power increase is: and then transmitted to the receiving end through the reflector 2059, the second wavelength division multiplexing isolator 2053, and the fourth transmission unit in sequence.
Note that the mirror 2059 is used here to reflect the pump light transmitted through the second wavelength division multiplexing isolator to ensure the power of the second pump light entering the erbium-doped fiber 2055.
In the composite remote gain unit 205 of the foregoing several configurations, the length of the erbium-doped fiber 2055 can range from: 16 meters (m) to 25m, the gain spectrum range being: 1530nm to 1570 nm. The first wavelength division multiplexer 2051 and the first wavelength division multiplexing isolator 2052 are low insertion loss passive devices, and the insertion loss of pump light is less than 0.5 dB. It should be noted that other wavelength division multiplexers and wavelength division multiplexing isolators are also low insertion loss passive devices. But its insertion loss is generally 0.8dB, unlike the first wavelength division multiplexer 2051 and the first wavelength division multiplexing isolator 2052.
In the underwater monitoring optical transmission system provided by the embodiment of the invention, the composite remote gain unit used by the first link and the second link can increase the optical power of the second optical signal through the pump light on the two links, so that the transmission distance of the second optical signal is increased, the transmission distance between the composite remote gain unit and the receiving end can be increased, the communication distance of the underwater monitoring optical transmission system is greatly prolonged, and the monitoring range of the underwater monitoring system is widened.
The above-described embodiments are merely preferred embodiments of the present invention, and are not intended to limit the scope of the present invention, and those skilled in the art can modify or change the above-described embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (9)
1. An underwater monitoring optical transmission system, the system comprising: the device comprises a transmitting end, a receiving end and a transmission link for connecting the transmitting end and the receiving end; the transmission link comprises a first link and a second link; wherein the content of the first and second substances,
the first link is used for transmitting a first optical signal sent by the transmitting end to the underwater detection unit through a first amplification unit, a first transmission unit, a composite remote gain unit and a second transmission unit which are connected in sequence;
the second link is used for transmitting a second optical signal to the receiving end through a third transmission unit, the composite remote gain unit, a fourth transmission unit and a second amplification unit which are connected in sequence;
wherein the composite remote gain unit is commonly used by the first link and the second link, and is configured to increase optical power of the second optical signal based on the first pump light provided by the first amplification unit and the second pump light provided by the second amplification unit, so that a transmission distance between the composite remote gain unit and the receiving end can be increased; the second optical signal is obtained by the underwater detection unit based on the detected outside signal and the received first optical signal; the external signal is a specific signal used for indicating the type of the underwater object;
wherein the first amplification unit includes a first sub-amplifier and a second sub-amplifier; the second amplifying unit comprises a third sub-amplifier and a fourth sub-amplifier;
wherein the first sub-amplifier and the fourth sub-amplifier are erbium-doped fiber amplifiers; the second sub-amplifier and the third sub-amplifier are Raman amplifiers.
2. The system of claim 1, wherein the complex remote gain unit comprises:
a first wavelength division multiplexer, a first wavelength division multiplexing isolator, a second wavelength division multiplexer, a second wavelength division multiplexing isolator and an erbium-doped fiber, wherein,
the first wavelength division multiplexer is configured to receive the first pump light and the first optical signal transmitted by the first transmission unit, transmit the first optical signal to the underwater detection unit through a second transmission unit, and transmit the first pump light to the first wavelength division multiplexing isolator;
the first wavelength division multiplexing isolator is used for receiving the first pump light and transmitting the first pump light to the erbium-doped fiber;
a second wavelength division multiplexing isolator for receiving the second pump light transmitted through the fourth transmission unit and transmitting the second pump light to the second wavelength division multiplexer;
the second wavelength division multiplexer is used for receiving the second pumping light and transmitting the second pumping light to the erbium-doped fiber;
the erbium-doped fiber is configured to receive the second optical signal, the first pump light, and the second pump light, and increase optical power of the second optical signal based on the first pump light and the second pump light, so that a transmission distance between the composite remote gain unit and the receiving end can be increased;
the second optical signal is transmitted to the erbium-doped fiber through the third transmission unit and the first wavelength division multiplexing isolator in sequence; and transmitting the second optical signal with increased power to the receiving end sequentially through a second wavelength division multiplexer, the second wavelength division multiplexing isolator and the fourth transmission unit.
3. The system of claim 1, wherein the complex remote gain unit comprises: a first wavelength division multiplexer, a first wavelength division multiplexing isolator, a second wavelength division multiplexer, a second wavelength division multiplexing isolator and an erbium-doped fiber, wherein,
the first wavelength division multiplexer is configured to receive the first pump light and the first optical signal transmitted by the first transmission unit, transmit the first optical signal to the underwater detection unit by a second transmission unit, and transmit the first pump light to the second wavelength division multiplexer;
the second wavelength division multiplexer is used for receiving the first pumping light and transmitting the first pumping light to the erbium-doped fiber;
the second wavelength division multiplexing isolator is used for receiving the second pump light transmitted by the fourth transmission unit and transmitting the second pump light to the first wavelength division multiplexing isolator;
the first wavelength division multiplexing isolator is used for receiving the second pump light and transmitting the second pump light to the erbium-doped fiber;
the erbium-doped fiber is configured to receive the second optical signal, the first pump light, and the second pump light, and increase optical power of the second optical signal based on the first pump light and the second pump light, so that a transmission distance between the composite remote gain unit and the receiving end can be increased;
the second optical signal is transmitted to the erbium-doped fiber through the third transmission unit and the first wavelength division multiplexing isolator in sequence; and transmitting the second optical signal with increased power to the receiving end sequentially through a second wavelength division multiplexer, the second wavelength division multiplexing isolator and the fourth transmission unit.
4. The system of claim 1, wherein the complex remote gain unit comprises: a first wavelength division multiplexer, a second wavelength division multiplexer, a third wavelength division multiplexing isolator and an erbium-doped fiber, wherein,
the first wavelength division multiplexer is configured to receive the first pump light and the first optical signal transmitted by the first transmission unit, transmit the first optical signal to the underwater detection unit through a second transmission unit, and transmit the first pump light to the third wavelength division multiplexer;
the third wavelength division multiplexer is used for receiving the first pumping light and transmitting the first pumping light to the second wavelength division multiplexer;
the second wavelength division multiplexer is used for receiving the first pumping light and transmitting the first pumping light to the erbium-doped fiber;
the third wavelength division multiplexing isolator is configured to receive the second pump light transmitted by the fourth transmission unit and transmit the second pump light to the second wavelength division multiplexer;
the second wavelength division multiplexer is used for receiving the second pumping light and transmitting the second pumping light to the erbium-doped fiber;
the erbium-doped fiber is configured to receive the second optical signal, the first pump light, and the second pump light, and increase optical power of the second optical signal based on the first pump light and the second pump light, so that a transmission distance between the composite remote gain unit and the receiving end can be increased;
wherein the second optical signal is transmitted to the erbium-doped fiber through the third transmission unit; and transmitting the second optical signal with increased power to the receiving end sequentially through a second wavelength division multiplexer, the third wavelength division multiplexing isolator and the fourth transmission unit.
5. The system of claim 4, wherein the complex remote gain unit further comprises: and the optical isolator is used for receiving the second optical signal transmitted by the third transmission unit and ensuring that the second optical signal is transmitted to the erbium-doped optical fiber in a single direction.
6. The system of claim 1, wherein the complex remote gain unit comprises: a first wavelength division multiplexer, a second wavelength division multiplexer, a first wavelength division multiplexing isolator, a second wavelength division multiplexing isolator and an erbium-doped fiber, wherein,
the first wavelength division multiplexer is configured to receive the first pump light and the first optical signal transmitted by the first transmission unit, transmit the first optical signal to the underwater detection unit by a second transmission unit, and transmit the first pump light to the second wavelength division multiplexer;
the second wavelength division multiplexing isolator is configured to receive the second pump light transmitted by the fourth transmission unit and transmit the second pump light to the second wavelength division multiplexer;
the second wavelength division multiplexer is configured to receive the first pump light and the second pump light, and transmit the first pump light and the second pump light to the first wavelength division multiplexing isolator;
the first wavelength division multiplexing isolator is used for receiving the first pump light and the second pump light and transmitting the first pump light and the second pump light to the erbium-doped fiber;
the erbium-doped fiber is used for the second optical signal, the first pump light and the second pump light, and the optical power of the second optical signal is increased based on the first pump light and the second pump light, so that the transmission distance between the composite remote gain unit and the receiving end can be increased;
the second optical signal is transmitted to the erbium-doped fiber through the third transmission unit and the first wavelength division multiplexing isolator in sequence; and the second optical signal with increased power is transmitted to the receiving end sequentially through the second wavelength division multiplexing isolator and the fourth transmission unit.
7. The system of claim 6, wherein the complex remote gain unit further comprises: and the reflector is positioned between the second wavelength division multiplexing isolator and the erbium-doped fiber and is used for reflecting the pump light which penetrates through the second wavelength division multiplexing isolator.
8. The system of claim 1, wherein the first transmission unit and the fourth transmission unit are equal in length; and the lengths of the first transmission unit and the fourth transmission unit satisfy:
wherein, PDIs the power, P, of the pump light generated in the first amplification unit in the first chainUThe power of the pump light generated in the second amplification unit in the second link; Δ is the transmission loss of the pump light relative to the optical signal; alpha is alphaDThe total loss of the optical signal is the total loss of the optical signal during the transmission of the first transmission unit and the second transmission unit in the first link; alpha is alphaUThe total loss of the optical signal during transmission in the third transmission unit and the fourth transmission unit in the second link is obtained; l is the length of the first transmission unit or the fourth transmission unit.
9. The system of any one of claims 2 to 7, wherein the erbium doped fiber has a length in the range of: 16 m-25 m, the gain spectrum range is as follows: 1530nm to 1570 nm.
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