CN112653518B - A relay-free transmission system and method for optical fiber hydrophone array - Google Patents
A relay-free transmission system and method for optical fiber hydrophone array Download PDFInfo
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- CN112653518B CN112653518B CN202011388487.7A CN202011388487A CN112653518B CN 112653518 B CN112653518 B CN 112653518B CN 202011388487 A CN202011388487 A CN 202011388487A CN 112653518 B CN112653518 B CN 112653518B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/29—Repeaters
- H04B10/291—Repeaters in which processing or amplification is carried out without conversion of the main signal from optical form
- H04B10/2912—Repeaters in which processing or amplification is carried out without conversion of the main signal from optical form characterised by the medium used for amplification or processing
- H04B10/2916—Repeaters in which processing or amplification is carried out without conversion of the main signal from optical form characterised by the medium used for amplification or processing using Raman or Brillouin amplifiers
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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
- H04B10/25—Arrangements specific to fibre transmission
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/44—Special adaptations for subaqueous use, e.g. for hydrophone
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Abstract
本发明提供了一种用于光纤水听器阵列的无中继传输系统及方法，所述无中继传输系统包括由传输光纤依次连接的光发射机、光放大组件、光纤水听器阵列、远程增益单元以及光接收机，所述光放大组件将所述光发射机发出的信号光进行放大后输送至所述光纤水听器阵列，所述光纤水听器阵列输出的信号光由所述远程增益单元进行放大后，输送至所述光放大组件，再由所述光放大组件放大后输送至所述光接收机。本发明的无中继传输系统及方法综合应用了掺杂介质光放大技术、光纤分布式拉曼放大技术和远程光泵浦放大技术，有效保证光纤水听器阵列对微弱信号的探测能力，大幅延长岸基固定式光纤声呐系统中密集复用光纤水听器阵列的无中继传输距离。
The present invention provides a relayless transmission system and method for a fiber optic hydrophone array, wherein the relayless transmission system comprises an optical transmitter, an optical amplifier component, a fiber optic hydrophone array, a remote gain unit, and an optical receiver connected in sequence by transmission optical fibers, wherein the optical amplifier component amplifies the signal light emitted by the optical transmitter and transmits it to the fiber optic hydrophone array, and the signal light output by the fiber optic hydrophone array is amplified by the remote gain unit and transmitted to the optical amplifier component, and then amplified by the optical amplifier component and transmitted to the optical receiver. The relayless transmission system and method of the present invention comprehensively apply doped medium optical amplification technology, fiber distributed Raman amplification technology, and remote optical pumping amplification technology, effectively ensuring the detection capability of the fiber optic hydrophone array for weak signals, and greatly extending the relayless transmission distance of the densely multiplexed fiber optic hydrophone array in the shore-based fixed fiber optic sonar system.
Description
Technical Field
The invention relates to the technical field of underwater detection, in particular to a relay-free transmission system and a relay-free transmission method for an optical fiber hydrophone array.
Background
The acoustic wave is the only energy radiation form capable of being remotely transmitted under water, the optical fiber hydrophone is a novel sensor for detecting, positioning and identifying an underwater target by utilizing the acoustic wave, and the optical fiber hydrophone is an underwater radar in modern military. The submarine shore-based fixed optical fiber sonar system is one of the main application forms of the optical fiber hydrophone array, and is the most advanced ocean passive detection system at present. In recent years, with the continuous improvement of the ship target noise reduction technology and the continuous improvement of the requirements on the detection distance and the detection precision of a sonar system, the scale of the seabed shore-based fixed optical fiber sonar system is continuously expanded, the number of primitives is increased to thousands or even tens of thousands, and the transmission distance is gradually expanded to hundreds or even thousands of kilometers.
The unrepeatered transmission is one of the main application forms of the long-distance transmission of the seabed shore-based fixed optical fiber sonar system, and provides a solution for offshore seabed detection. The optical fiber hydrophone array usually adopts a time division, wavelength division and space division mixed multiplexing array mode, but as a shore-based fixed optical fiber sonar system is developed towards a large-scale and long-distance direction, the array adopts a time division and wavelength division mixed multiplexing mode, and the optical fiber hydrophone array with 64 primitives, 128 primitives and even 256 primitives is multiplexed by a single fiber pair, so that the optical fiber pair number is greatly reduced, and the complexity and the cost of the system are reduced.
However, the inherent loss of the optical fiber hydrophone array of large-scale dense multiplexing is large, taking the optical fiber hydrophone array of single fiber pair multiplexing 64 cells as an example, the inherent loss is generally larger than 20dB, and the larger the number of single fiber pair multiplexing cells is, the larger the inherent loss of the optical fiber hydrophone array is. When the optical fiber transmission distance of the submarine shore-based fixed optical fiber sonar system exceeds hundred kilometers, the optical power loss of the whole transmission system is larger than 60dB.
Conventionally, unrepeatered transmission systems based on centralized active erbium-doped fiber amplifiers or distributed fiber raman amplifiers have failed to achieve unrepeatered transmission demands of over hundred kilometers offshore from densely multiplexed fiber optic hydrophone arrays. In order to ensure the detectability of the optical fiber hydrophone array to weak signals, the analog optical signals transmitted remotely must be effectively amplified. Therefore, a no-relay transmission system is needed, which not only can realize effective amplification of the analog optical signals of the densely-multiplexed optical fiber hydrophone array, but also can break through the limitation of the traditional optical amplification method on the no-relay transmission distance.
Disclosure of Invention
The present invention is directed to solving the problems described above. It is an object of the present invention to provide a relay-less transmission system and method that solves any one of the above problems. Specifically, the invention provides a submarine shore-based fixed optical fiber sonar unrepeatered transmission system and unrepeatered transmission method capable of satisfying more than hundred kilometers offshore.
According to one aspect of the invention, the invention provides a relay-free transmission system for an optical fiber hydrophone array, which comprises an optical transmitter, an optical amplification assembly, an optical fiber hydrophone array, a remote gain unit and an optical receiver which are sequentially connected by transmission optical fibers, wherein the remote gain unit and the optical fiber hydrophone array are positioned at a wet end, and the optical transmitter, the optical receiver and the optical amplification assembly are positioned at a dry end;
The optical amplification assembly comprises a control unit, an optical power amplifier, an optical pre-amplifier and an associated pump unit, wherein the optical power amplifier is connected with an output end optical fiber of the optical transmitter and is connected with the optical fiber hydrophone array through a transmission optical fiber for improving the optical power of incoming fibers, the optical pre-amplifier is connected with the remote gain unit through the transmission optical fiber and is connected with an input end optical fiber of the optical receiver for improving the sensitivity of the optical receiver, the associated pump unit is optically connected with a transmission optical fiber between the remote gain unit and the optical pre-amplifier, and the control unit is in signal connection with the optical power amplifier, the optical pre-amplifier and the associated pump unit and is used for configuring the gain and/or output power of the optical power amplifier, the optical pre-amplifier and the associated pump unit;
The along-the-road pumping unit comprises a along-the-road Cheng Bengpu module, the along-the-road Cheng Bengpu module is used for providing remote pumping light which can reach the remote gain unit, and the remote gain unit amplifies signal light by utilizing the remote pumping light from the along-the-road Cheng Bengpu module.
The along-the-way pumping unit further comprises a along-the-way Raman pumping module and a along-the-way combiner, wherein the along-the-way Raman pumping module outputs Raman pumping light, and is used for carrying out homodromous distributed Raman amplification on the remote pumping light output by the along-the-way Cheng Bengpu module and carrying out reverse distributed Raman amplification on the signal light output by the remote gain unit, and the along-the-way combiner is used for combining and outputting the remote pumping light output by the along-the-way Cheng Bengpu module and the Raman pumping light output by the along-the-way Raman pumping module.
The optical amplifying assembly further comprises a forward Raman pump unit, wherein the forward Raman pump unit is in optical coupling connection with a transmission optical fiber between the optical power amplifier and the optical fiber hydrophone array and is used for carrying out homodromous distributed Raman amplification on signal light output by the optical power amplifier, and the control unit is further used for configuring output power of the forward Raman pump unit.
The optical amplifying assembly further comprises at least one bypass pump unit, each bypass pump unit is connected with the remote gain unit through a transmission optical fiber, and the control unit is further used for configuring the output power of the bypass pump unit.
The bypass pump unit comprises a bypass remote pump module for providing additional remote pump light that reaches the remote gain unit, which further amplifies the signal light with the additional remote pump light from the bypass remote pump module.
The bypass pump unit further comprises a bypass Raman pump module and a bypass combiner, wherein the bypass Raman pump module outputs Raman pump light and is used for carrying out homodromous distributed Raman amplification on the extra remote pump light output by the bypass remote pump module, and the bypass combiner is used for combining and outputting the extra remote pump light output by the bypass remote pump module and the Raman pump light output by the bypass Raman pump module.
The transmission optical fiber adopted by the unrepeatered transmission system is a single-mode optical fiber.
The following Lu Laman pumping module comprises one or more of a first-order Raman pumping laser source group, a second-order Raman pumping laser source group and a third-order Raman pumping laser source group.
The forward Raman pumping unit comprises one or more of a first-order Raman pumping laser source group, a second-order Raman pumping laser source group and a third-order Raman pumping laser source group.
The bypass Raman pump module comprises one or more of a first-order Raman pump laser source group, a second-order Raman pump laser source group and a third-order Raman pump laser source group.
The optical power amplifier is a erbium-doped optical fiber amplifier or a erbium-doped waveguide optical amplifier, and the optical pre-amplifier is a erbium-doped optical fiber amplifier or a erbium-doped waveguide optical amplifier.
The remote gain unit is a doped gain medium unit, and the gain medium in the remote gain unit is an erbium-doped optical fiber or an erbium-doped waveguide device.
According to another aspect of the present invention, there is also provided a no-relay transmission method implemented by the no-relay transmission system as described above.
The unrepeatered transmission system and method comprehensively apply the doping medium optical amplification technology, the optical fiber distributed Raman amplification technology and the remote optical pumping amplification technology, utilize the doping medium optical amplifier as an optical power amplifier and an optical preamplifier to respectively improve the optical power of signal light entering fiber and the sensitivity of an optical receiver, apply the optical fiber distributed Raman amplification technology to carry out distributed Raman amplification on signal light and remote pumping light in a transmission optical fiber, and simultaneously apply a gain medium of a remote gain unit in a transmission link to carry out remote passive amplification on the signal light, thereby effectively ensuring the detection capability of an optical fiber hydrophone array on weak signals and greatly prolonging the unrepeatered transmission distance of a densely multiplexing optical fiber hydrophone array in a shore-based fixed optical fiber sonar system.
Other characteristic features and advantages of the invention will become apparent from the following description of exemplary embodiments, which is to be read with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention. In the drawings, like reference numerals are used to identify like elements. The drawings, which are included in the description, illustrate some, but not all embodiments of the invention. Other figures can be derived from these figures by one of ordinary skill in the art without undue effort.
Fig. 1 schematically illustrates the structure of an embodiment of a trunking-free transmission system of the present invention;
Fig. 2 shows an exemplary schematic diagram of a construction of the pump-along unit;
Fig. 3 schematically illustrates a configuration of a second embodiment of the unrepeatered transmission system of the present invention;
fig. 4 exemplarily shows a schematic structural diagram of a third embodiment of the unrepeatered transmission system of the present invention;
fig. 5 exemplarily shows a structural schematic diagram of a fourth embodiment of the unrepeatered transmission system of the present invention;
fig. 6 exemplarily shows a structural schematic diagram of a fifth embodiment of the unrepeatered transmission system of the present invention;
Fig. 7 shows an exemplary schematic diagram of a bypass pump unit;
fig. 8 exemplarily shows a structural schematic diagram of a sixth embodiment of the unrepeatered transmission system of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application. It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be arbitrarily combined with each other.
In order to realize the relay-free transmission requirement of the optical fiber hydrophone array exceeding hundred kilometers, the invention provides a relay-free transmission system for the optical fiber hydrophone array, which comprehensively applies an optical fiber distributed Raman amplification technology, a doped medium optical amplification technology and a remote optical pumping amplification technology, utilizes a doped medium optical amplifier as an optical power amplifier and an optical preamplifier to respectively improve the optical power of signal light entering fiber and the sensitivity of an optical receiver, applies the optical fiber distributed Raman amplification technology to perform distributed Raman amplification on the signal light and the remote pumping light in a transmission optical fiber, and simultaneously applies a gain medium of a remote gain unit in a transmission link to perform remote passive amplification on the signal light.
The unrepeatered transmission system and method for an optical fiber hydrophone array according to the present invention will be described in detail with reference to the accompanying drawings.
Fig. 1 shows a schematic structural diagram of a unrepeatered transmission system for an optical fiber hydrophone array according to the invention, which unrepeatered transmission system comprises, as shown in fig. 1, an optical transmitter 1, an optical amplifying assembly 2, an optical fiber hydrophone array 3, a remote gain unit 4 and an optical receiver 5, which are connected in sequence by transmission fibers, wherein the remote gain unit 4 and the optical fiber hydrophone array 3 are located at the wet end and the optical transmitter 1, the optical receiver 5 and the optical amplifying assembly 2 are located at the dry end. After the signal light emitted by the optical transmitter 1 is amplified by the optical amplifying assembly 2, the signal light sequentially passes through the transmission optical fiber 10a in front of the optical fiber hydrophone array 3, the transmission optical fiber 10b between the optical fiber hydrophone array 3 and the remote gain unit 4, the signal light reaching the remote gain unit 4 is amplified again, then enters the transmission optical fiber 10c, enters the optical amplifying assembly 2 through the transmission optical fiber 10c for further amplification, and finally enters the optical receiver 5 for receiving.
The remote gain unit 4 is a doped gain medium unit, and its core component is a doped gain medium device, so that the signal light can be amplified under the action of the remote pump light. The gain medium doped in the remote gain unit 4 is a passive medium, and may be a section of erbium doped fiber, or may be a erbium doped waveguide or other doped gain medium. The remote gain unit 4 is also a passive module, and is not powered, and can be installed in a submarine cable closure or an array cable closure.
In the embodiment shown in fig. 1, the optical amplifying assembly 2 comprises a control unit 21, an optical power amplifier 22, an optical preamplifier 23 and a following pump unit 24, wherein the optical power amplifier 22 is connected with an output end optical fiber of the optical transmitter 1 and is connected with the optical fiber hydrophone array 3 through a transmission optical fiber 10a, the optical preamplifier 23 is connected with a remote gain unit 4 through a transmission optical fiber 10c and is connected with an input end optical fiber of the optical receiver 5, the following pump unit 24 is optically connected with the transmission optical fiber 10c between the remote gain unit 4 and the optical preamplifier 23, namely, the remote pump light emitted by the following pump unit 24 is coupled into the transmission optical fiber 10c through a wavelength division multiplexing device, and the control unit 21 is in signal connection with the optical power amplifier 22, the optical preamplifier 23 and the following pump unit 24 and is used for configuring parameters such as gain and/or output power of the optical power amplifier 22, the optical preamplifier 23 and the following pump unit 24.
The optical power amplifier 22 is used to increase the optical power of the incoming fiber, and the optical pre-amplifier 23 is used to increase the sensitivity of the optical receiver 5. In the present invention, the optical power amplifier 22 may be a conventional erbium-doped optical fiber amplifier, a erbium-doped waveguide optical amplifier or other types of doped medium optical amplifiers, and the optical pre-amplifier 23 may be a conventional erbium-doped optical fiber amplifier, a erbium-doped waveguide optical amplifier or other types of doped medium optical amplifiers.
The along-the-road pumping unit 24 comprises a along-the-road Cheng Bengpu module 241, the along-the-road Cheng Bengpu module 241 being configured to provide remote pump light that reaches the remote gain unit 4, the remote gain unit 4 being configured to amplify the optical signal with the remote pump light from the along-the-road remote gain module 24. Specifically, the remote-along-path Cheng Bengpu module 241 is configured to provide remote pump light, which is transmitted in a direction opposite to that of the signal light in the transmission optical fiber 10c, to the remote gain unit 4, and the remote gain unit 4 amplifies the signal light by using the interaction of its gain medium with the remote pump light and the signal light.
Since the optical power of the signal light in 1550nm band is increased by the optical amplifier and the inherent attenuation per unit distance in the standard single mode fiber is lower, the signal light in 1550nm band is mostly used in long distance signal transmission. For example, for erbium-doped gain media, the signal light in 1550nm band is amplified, and the pump light is generally in 980nm or 1480nm band, because the transmission loss of the pump light in 1480nm band in the transmission fiber is relatively smaller, and therefore, the wavelength of the pump laser source group of the along-the-path Cheng Bengpu module 241 is generally selected to be 1480nm band.
In operation, signal light emitted by the optical transmitter 1 is amplified by the optical power amplifier 22, sequentially passes through the transmission optical fiber 10a, the optical fiber hydrophone array 3 and the transmission optical fiber 10b, reaches the remote gain unit 4 to be amplified again, then enters the transmission optical fiber 10c, is transmitted to the optical preamplifier 23 through the transmission optical fiber 10c to be amplified further, and finally enters the optical receiver 5 to be received. The traditional long-distance unrepeatered transmission system is mainly limited by optical power and optical signal to noise ratio, so that the expected transmission distance is difficult to reach, the optical power can be well solved through an optical amplifier, and the optical signal to noise ratio is difficult to meet the expected requirement. The invention adopts a remote optical pumping amplification technology to ensure that the signal is amplified under the condition of higher signal optical power, reduce the degradation of the remote transmission on the optical signal to noise ratio and greatly prolong the unrepeatered transmission distance of the optical fiber hydrophone array in the shore-based fixed optical fiber sonar system.
Fig. 2 shows a schematic structural diagram of a specific embodiment of the along-path pump unit 24 in the present invention, where the along-path pump unit 24 includes a along-path remote Cheng Bengpu module 241, and further includes a along-path raman pump module 242 and a along-path combiner 243.
As shown in fig. 1 and 2, the remote Cheng Bengpu module 241 is configured to provide remote pump light that can reach the remote gain module 4, where the remote pump light is transmitted in a direction opposite to the signal light in the transmission optical fiber 10c, and reaches the remote gain module 4, and amplify the signal light by using interaction between the gain medium and the remote pump light and the signal light. The along-path raman pump module 242 is configured to provide raman pump light, which is transmitted in the same direction as the remote pump light output by the along-path Cheng Bengpu module 241 in the transmission fiber 10c, that is, the transmission direction of the raman pump light in the transmission fiber 10c is opposite to the transmission direction of the signal light output by the remote gain module 4. The raman pump light emitted by the along-the-path raman pump module 242 is applied to the homodromous distributed raman amplification of the remote pump light output by the along-the-path Cheng Bengpu module 241, and the inverse distributed raman amplification of the signal light output by the remote gain unit 4. The along-path combiner 243 is configured to combine and output the remote pump light output by the along-path remote Cheng Bengpu module 241 and the raman pump light output by the along-path raman pump module 242.
Illustratively, the along-path raman pump module 242 includes one or more of a first order raman pump laser source group, a second order raman pump laser source group, and a third order raman pump laser source group, and may include, for example, only the first order raman pump laser source group, or may include a first order raman pump laser source group and a second order raman pump laser source group, or may include a first order raman pump laser source group, a second order raman pump laser source group, and a third order raman pump laser source group. The wavelength of the first-order Raman pump laser source group is 14xxnm, the wavelength of the second-order Raman pump laser source group is 13xxnm, and the wavelength of the third-order Raman pump laser source group is 12xxnm.
For the optical fiber distributed Raman amplification, the gain spectrum is a continuous spectrum, the peak gain wavelength is about 100nm longer than the provided Raman pump wavelength, the gain bandwidth is about 300nm, the distributed Raman amplification is carried out on the remote pump light with 1480nm wave band and the signal light with 1550nm wave band, the Raman pump light wavelength is selected to be 14xxnm, which is a first-order Raman pump laser source group, the second-order Raman pump laser source group wavelength is selected to be 13xxnm, the distributed Raman amplification is carried out on the first-order Raman pump laser source group 14xxnm Raman pump light, the third-order Raman pump laser source group wavelength is selected to be 12xxnm, and the distributed Raman amplification is carried out on the second-order Raman pump laser source group 13xxnm Raman pump light.
Fig. 3 shows a schematic structural diagram of a second embodiment of the unrepeatered transmission system of the invention, in which the optical amplification assembly 2 further comprises a forward raman pumping unit 25, in comparison to the embodiment shown in fig. 1. Accordingly, the structure of the along-path pumping unit 24 shown in fig. 2 may be integrated with the unrepeatered transmission system shown in fig. 3, that is, the forward raman pumping unit 25 may be additionally arranged in the unrepeatered transmission system in which the along-path pumping unit 24 includes the along-path Cheng Bengpu module 241, the along-path raman pumping module 242 and the along-path combiner 243.
Specifically, the forward raman pump unit 25 is optically coupled to the transmission fiber 10a between the optical power amplifier 22 and the optical fiber hydrophone array 3, that is, raman pump light emitted by the forward raman pump unit 25 is coupled into the transmission fiber 10a through a wavelength division multiplexing device, so as to perform homodromous distributed raman amplification on signal light output by the optical power amplifier 22. The forward raman pump unit 25 is located at the dry end with the control unit 21, the optical power amplifier 22, the optical pre-amplifier 23 and the along-the-path pump unit 24, and the forward raman pump unit 25 is also connected with the control unit 21 by signals, and the control unit 21 configures parameters such as output power of the pump laser source group of the forward raman pump unit 25.
Illustratively, the forward raman pumping unit 25 includes one or more of a first order raman pump laser source group, a second order raman pump laser source group, and a third order raman pump laser source group, for example, may include only the first order raman pump laser source group, may include a first order raman pump laser source group and a second order raman pump laser source group, and may include a first order raman pump laser source group, a second order raman pump laser source group, and a third order raman pump laser source group. The wavelength of the first-order Raman pump laser source group is 14xxnm, the wavelength of the second-order Raman pump laser source group is 13xxnm, and the wavelength of the third-order Raman pump laser source group is 12xxnm. In an alternative embodiment, forward Raman pump unit 25 comprises a first order Raman pump laser source group, emitting Raman pump light in the wavelength band of 14 xxnm.
Specifically, the raman pump light emitted by the forward raman pump unit 25 is coupled into the transmission fiber 10a between the optical power amplifier 22 and the fiber hydrophone array 3, and is transmitted in the same direction as the signal light, and the signal light interacts with the 14xxnm raman pump light in the transmission fiber 10a, so that distributed raman amplification occurs. By adopting the technical scheme of the embodiment, the output power of the optical power amplifier 22 can be reduced, namely, the optical power of the incoming fiber can be reduced. The size of the optical power of the incoming fiber is closely related to the nonlinear effect of the optical fiber, so that the optical power of the incoming fiber is reduced, the influence of the nonlinear effect of the optical fiber on the signal light can be effectively reduced, the quality of the signal light is improved, and the support is provided for the distance for transmitting the signal light further.
In the unrepeatered transmission system of the present invention, the optical amplifying assembly 2 may further comprise at least one bypass pump unit 26 in signal connection with the control unit 21, fig. 4 shows a schematic structural diagram of a third embodiment of the unrepeatered transmission system of the present invention, fig. 5 shows a schematic structural diagram of a fourth embodiment of the unrepeatered transmission system, and fig. 6 shows a schematic structural diagram of a fifth embodiment of the unrepeatered transmission system. In the embodiment shown in fig. 4, two bypass pump units 26 are provided on the basis of the structure of the unrepeatered transmission system in the embodiment shown in fig. 1, whereas in the embodiment shown in fig. 5, one bypass pump unit 26 is provided on the basis of the embodiment shown in fig. 3, and in the embodiment shown in fig. 6, the unrepeatered transmission system formed by adding two bypass pump units 26 to the optical amplifying module 2 in the embodiment shown in fig. 3 is provided.
As shown in fig. 4-6, each bypass pump unit 26 is located at the dry end and is connected to the remote gain unit 4 via the transmission fiber 10d, i.e. a parallel relationship between the plurality of bypass pump units 26. Correspondingly, the control unit 21 is further configured to configure parameters such as output power of the pump laser source group of the bypass pump unit 26.
In an alternative embodiment, the bypass pump unit 26 comprises a bypass remote pump module 261, the bypass remote pump module 261 being adapted to provide additional remote pump light, e.g. of the 1480nm band, which reaches the remote gain unit 4, the remote gain unit 4 further amplifying the signal light with the additional remote pump light from the bypass remote pump module 261. The additional remote pump light provided by the bypass remote pump module 261 is used to increase the gain of the signal light in the remote gain unit 4 and provide support for transmitting the signal light over longer distances.
Fig. 7 shows a schematic diagram of a specific embodiment of the bypass pump unit 26, in which the bypass pump unit 26 comprises a bypass remote pump module 261, a bypass raman pump module 262 and a bypass combiner 263. The bypass raman pump module 262 outputs raman pump light, and is configured to perform homodromous distributed raman amplification on the additional remote pump light output by the bypass remote pump module 261 in the transmission optical fiber 10d, so as to further improve the remote pump light power reaching the 1480nm band of the remote gain unit 4, and the bypass combiner 263 is configured to combine and output the additional remote pump light output by the bypass remote pump module 261 with the raman pump light output by the bypass raman pump module 262.
Illustratively, the bypass raman pump module 262 includes one or more of a first order raman pump laser source group, a second order raman pump laser source group, and a third order raman pump laser source group, and may include, for example, only the first order raman pump laser source group, or may include a first order raman pump laser source group and a second order raman pump laser source group, or may include a first order raman pump laser source group, a second order raman pump laser source group, and a third order raman pump laser source group. The wavelength of the first-order Raman pump laser source group is 14xxnm, the wavelength of the second-order Raman pump laser source group is 13xxnm, and the wavelength of the third-order Raman pump laser source group is 12xxnm. Referring back to the embodiment shown in fig. 4 and 6, if the bypass pump unit 26 in this embodiment adopts the structure shown in fig. 7, the pump light power reaching the 1480nm band of the remote gain unit 4 can be further increased, that is, the gain of the signal light in the remote gain unit 4 can be further increased, the signal light power level can be increased, and the transmission distance of the signal light can be further prolonged.
Fig. 8 shows a schematic structural diagram of a sixth embodiment of the unrepeatered transmission system according to the present invention, in which the optical amplification assembly 2 comprises a random access pump unit 24, a forward raman pump unit 25, and a bypass pump unit 26. At this time, the along-path pump unit 24 may include a along-path remote Cheng Bengpu module 241, a along-path raman pump module 242, and a along-path combiner 243 as shown, or may include only the along-path remote Cheng Bengpu module 241, and the bypass pump unit 26 may include a bypass remote pump module 261, a bypass raman pump module 262, and a bypass combiner 263, or may include only the bypass remote pump module 261.
It should be noted that the transmission optical fiber used in the unrepeatered transmission system of the present invention is a single mode optical fiber, and for example, may be a g.652 or g.654 single mode optical fiber.
Illustratively, if the length of the transmission fiber 10a between the optical power amplifier 22 and the optical fiber hydrophone array 3 is L1, the length of the transmission fiber 10b between the optical fiber hydrophone array 3 and the remote gain unit 4 is L2, the length of the transmission fiber 10c between the remote gain unit 4 and the optical preamplifier 23 is L3, and the length of the transmission fiber 10d between each bypass pump unit 26 and the remote gain unit 4 is L4, the following relationship is satisfied:
L1=l2 +L3, the number of the components is 3, and L2.gtoreq.0, L4=L3.
The invention also provides a relay-free transmission method for the optical fiber hydrophone array, which is realized by the relay-free transmission system. In the unrepeatered transmission method, the optical fiber distributed Raman amplification technology, the doped medium optical amplification technology and the remote pump light amplification technology are comprehensively applied, and the method specifically comprises the following steps of:
The optical power amplifier 22 amplifies the power of the signal light emitted from the optical transmitter 1 and then enters the transmission optical fiber 10a for transmission;
The forward Raman pump unit 25 outputs Raman pump light into the transmission optical fiber 10a, and carries out homodromous distributed Raman amplification on the signal light in the transmission optical fiber 10a, and the signal light after the homodromous distributed Raman amplification is transmitted to the remote gain unit 4 through the optical fiber hydrophone array 3;
The remote gain unit 4 amplifies the signal light by utilizing the interaction of the gain medium and the remote pump light emitted by the associated pump unit 24 or the remote pump light emitted by the associated pump unit 24 and at least one bypass pump unit 26 and the signal light output by the optical fiber hydrophone array 3, wherein the transmission direction of the remote pump light is opposite to that of the signal light;
the raman pump light emitted by the along-the-road raman pump module 242 in the along-the-road pump unit 24 performs homodromous distributed raman amplification on the remote pump light emitted by the along-the-road Cheng Bengpu module 241 in the transmission optical fiber 10c, and performs inverse distributed raman amplification on the signal light output by the remote gain unit 4;
if bypass pump modules 26 are provided, the bypass raman pump module 262 in each bypass pump module 26 performs homodromous distributed raman amplification on the additional remote pump light emitted by the bypass remote pump module 261 in the respective transmission optical fiber 10 d;
the optical pre-amplifier 23 prevents the signal light sent from the transmission optical fiber 10c from being large again and then sends the signal light into the optical receiver 5.
The above description may be implemented alone or in various combinations and these modifications are within the scope of the present invention.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one.," does not exclude the presence of additional identical elements in a process, method, article, or apparatus that comprises the element.
Finally, it should be noted that the above-mentioned embodiments are only for illustrating the technical solution of the present invention, and are not limiting. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that modifications may be made to the technical solutions described in the foregoing embodiments or equivalents may be substituted for some of the technical features thereof, and that such modifications or substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention in essence of the corresponding technical solutions.
Claims (11)
1. The relay-free transmission system for the optical fiber hydrophone array is characterized by comprising an optical transmitter (1), an optical amplification assembly (2), an optical fiber hydrophone array (3), a remote gain unit (4) and an optical receiver (5) which are sequentially connected by transmission optical fibers, wherein the remote gain unit (4) and the optical fiber hydrophone array (3) are positioned at a wet end, the optical transmitter (1), the optical receiver (5) and the optical amplification assembly (2) are positioned at a dry end, the optical amplification assembly (2) amplifies signal light emitted by the optical transmitter (1) and then transmits the amplified signal light to the optical fiber hydrophone array (3), and the signal light output by the optical fiber array (3) is amplified by the remote gain unit (4) and then transmitted to the optical amplification assembly (2) and then amplified by the optical amplification assembly (2) and then transmitted to the optical receiver (5);
the optical amplification assembly (2) comprises a control unit (21), an optical power amplifier (22), an optical preamplifier (23) and a channel-associated pumping unit (24), wherein the optical power amplifier (22) is in optical coupling connection with an output end optical fiber of the optical transmitter (1) and is connected with the optical fiber hydrophone array (3) through a transmission optical fiber so as to improve the optical power of incoming fibers, the optical preamplifier (23) is connected with the remote gain unit (4) through the transmission optical fiber and is in optical coupling connection with an input end optical fiber of the optical receiver (5) so as to improve the sensitivity of the optical receiver (5), the channel-associated pumping unit (24) is in optical coupling connection with the transmission optical fiber between the remote gain unit (4) and the optical preamplifier (23), and the control unit (21) is in signal coupling connection with the optical power amplifier (22), the optical preamplifier (23) and the channel-associated pumping unit (24) so as to configure the optical power amplifier (22), the optical preamplifier (23), the channel-associated pumping unit (24) and/or the gain of the optical amplifier (23);
the along-the-way pump unit (24) comprises a along-the-way remote Cheng Bengpu module (241), the along-the-way remote Cheng Bengpu module (241) is used for providing remote pump light reaching the remote gain unit (4), and the remote gain unit (4) amplifies signal light by using the remote pump light from the along-the-way remote Cheng Bengpu module (241);
The channel-associated pumping unit (24) further comprises a channel-associated Raman pumping module (242) and a channel-associated combiner (243), wherein the channel-associated Raman pumping module (242) outputs Raman pump light, is used for carrying out homodromous distributed Raman amplification on remote pump light output by the channel-associated remote Cheng Bengpu module (241) and carrying out reverse distributed Raman amplification on signal light output by the remote gain unit (4), and the channel-associated combiner (243) is used for combining and outputting remote pump light output by the channel-associated remote Cheng Bengpu module (241) and Raman pump light output by the channel-associated Raman pumping module (242);
the optical power amplifier (22) is a erbium-doped optical fiber amplifier or a erbium-doped waveguide optical amplifier, and the optical pre-amplifier (23) is a erbium-doped optical fiber amplifier or a erbium-doped waveguide optical amplifier.
2. The trunkless transmission system of claim 1 wherein the optical amplifying assembly (2) further comprises a forward raman pump unit (25), the forward raman pump unit (25) being optically coupled to the transmission fiber between the optical power amplifier (22) and the fiber hydrophone array (3) for homodromously distributed raman amplification of the signal light output by the optical power amplifier (22);
the control unit (21) is further configured to configure the output power of the forward raman pump unit (25).
3. The trunkless transmission system of claim 1 wherein the optical amplifying assembly (2) further comprises at least one bypass pump unit (26), each bypass pump unit (26) being connected to the remote gain unit (4) by a transmission fiber, the control unit (21) being further adapted to configure the output power of the bypass pump unit (26).
4. A trunkless transmission system according to claim 3, wherein the bypass pump unit (26) comprises a bypass remote pump module (261), the bypass remote pump module (261) being arranged to provide additional remote pump light which reaches the remote gain unit (4), the remote gain unit (4) amplifying the signal light with the additional remote pump light from the bypass remote pump module (261).
5. The unrepeatered transmission system of claim 4, wherein the bypass pump unit (26) further comprises a bypass raman pump module (262) and a bypass combiner (263), wherein the bypass raman pump module (262) outputs raman pump light for homodromous distributed raman amplification of additional remote pump light output by the bypass remote pump module (261), and wherein the bypass combiner (263) is configured to combine and output the additional remote pump light output by the bypass remote pump module (261) with raman pump light output by the bypass raman pump module (262).
6. The unrepeatered transmission system of claim 1, wherein the transmission fiber employed in the unrepeatered transmission system is a single mode fiber.
7. The unrepeatered transmission system of claim 1, wherein the random raman pump module (242) comprises one or more of a first order raman pump laser source group, a second order raman pump laser source group, a third order raman pump laser source group.
8. The unrepeatered transmission system of claim 2, wherein the forward raman pumping unit (25) comprises one or more of a first order raman pump laser source group, a second order raman pump laser source group, a third order raman pump laser source group.
9. The unrepeatered transmission system of claim 5, wherein the bypass raman pump module (262) comprises one or more of a first order raman pump laser source bank, a second order raman pump laser source bank, and a third order raman pump laser source bank.
10. The trunkless transmission system of claim 1 wherein the remote gain unit (4) is a doped gain medium unit, the gain medium in the remote gain unit (4) being an erbium doped fiber or a erbium doped waveguide device.
11. A no-relay transmission method, characterized in that the no-relay transmission method is implemented by the no-relay transmission system according to any of claims 1-10.
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