CN112653518A - Unrepeatered transmission system and method for optical fiber hydrophone array - Google Patents
Unrepeatered transmission system and method for optical fiber hydrophone array Download PDFInfo
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- CN112653518A CN112653518A CN202011388487.7A CN202011388487A CN112653518A CN 112653518 A CN112653518 A CN 112653518A CN 202011388487 A CN202011388487 A CN 202011388487A CN 112653518 A CN112653518 A CN 112653518A
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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
The invention provides a non-relay transmission system and a method for an optical fiber hydrophone array, wherein the non-relay transmission system comprises an optical transmitter, an optical amplification component, the optical fiber hydrophone array, a remote gain unit and an optical receiver which are sequentially connected through a transmission optical fiber, the optical amplification component amplifies signal light emitted by the optical transmitter and then transmits the amplified signal light to the optical fiber hydrophone array, and the signal light output by the optical fiber hydrophone array is amplified by the remote gain unit, then transmitted to the optical amplification component, amplified by the optical amplification component and then transmitted to the optical receiver. The unrepeatered transmission system and the unrepeatered transmission method comprehensively apply a doped medium optical amplification technology, an optical fiber distributed Raman amplification technology and a remote optical pumping amplification technology, effectively ensure the detection capability of the optical fiber hydrophone array on weak signals, and greatly prolong the unrepeatered transmission distance of the dense multiplexing optical fiber hydrophone array in the shore-based fixed optical fiber sonar system.
Description
Technical Field
The invention relates to the technical field of underwater detection, in particular to a system and a method for unrepeatered transmission of an optical fiber hydrophone array.
Background
The acoustic wave is the only energy radiation form capable of performing long-distance propagation underwater, and the optical fiber hydrophone is a novel sensor for detecting, positioning and identifying underwater targets by using the acoustic wave, and is an underwater radar in modern military. The seabed shore-based fixed optical fiber sonar system is one of the main application forms of an 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 fiber sonar system is continuously enlarged, the number of elements is increased to thousands or even tens of thousands, and the transmission distance is gradually extended to hundreds or even thousands of kilometers.
The non-relay transmission is one of the main application forms of the long-distance transmission of the seabed shore-based fixed fiber sonar system, and provides a solution for offshore seabed detection. The optical fiber hydrophone array usually adopts a group array mode of time division, wavelength division and space division hybrid multiplexing, but as a bank-based fixed optical fiber sonar system develops towards a large scale and a long distance, the array mostly adopts the time division and wavelength division hybrid multiplexing mode, and by multiplexing 64-element, 128-element and even 256-element optical fiber hydrophone arrays through single fiber pairs, the fiber pair number of optical cables is greatly reduced, and the complexity and the cost of the system are reduced.
However, the inherent loss of the large-scale densely multiplexed fiber optic hydrophone array is large, the inherent loss of the fiber optic hydrophone array for multiplexing 64 elements in a single fiber pair is generally greater than 20dB, and the inherent loss of the fiber optic hydrophone array is greater as the number of the elements in the single fiber pair is greater. When the optical fiber transmission distance of the seabed shore-based fixed optical fiber sonar system exceeds one hundred kilometers, the optical power loss of the whole transmission system is larger than 60 dB.
Traditionally, unrepeatered transmission systems based on centralized active erbium-doped fiber amplifiers or distributed fiber raman amplifiers have failed to fulfill the unrepeatered transmission requirements of dense multiplexed fiber optic hydrophone arrays over a hundred kilometers offshore. In general, to ensure the detection capability of the fiber hydrophone array for weak signals, analog optical signals transmitted over a long distance must be effectively amplified. Therefore, a relay-less transmission system is needed, which not only can realize the effective amplification of the analog optical signals of the dense multiplexing optical fiber hydrophone array, but also can break through the limitation of the traditional optical amplification method on the relay-less 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 system and method for unrepeatered transmission that addresses any of the above problems. Specifically, the invention provides a submarine shore-based fixed optical fiber sonar unrepeatered transmission system and a unrepeatered transmission method which can meet the requirement that offshore distance exceeds hundreds of kilometers.
According to an aspect of the present invention, there is provided a unrepeatered transmission system for a fiber optic hydrophone array, the unrepeatered transmission system comprising an optical transmitter, an optical amplification component, a fiber optic hydrophone array, a remote gain unit, and an optical receiver connected in sequence by a transmission fiber, the remote gain unit and the fiber optic hydrophone array being located at a wet end, the optical transmitter, the optical receiver, and the optical amplification component being located at a dry end; the optical amplification component amplifies the signal light emitted by the optical transmitter and then transmits the signal light to the optical fiber hydrophone array, and the signal light output by the optical fiber hydrophone array is amplified by the remote gain unit, then transmitted to the optical amplification component, amplified by the optical amplification component and then transmitted to the optical receiver;
the optical amplification assembly comprises a control unit, an optical power amplifier, an optical preamplifier and a channel following pumping 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 and used for improving the optical power of fiber entering; the optical preamplifier is connected with the remote gain unit through a transmission optical fiber and is connected with an input end optical fiber of the optical receiver, and the optical preamplifier is used for improving the sensitivity of the optical receiver; the channel associated pumping unit is optically coupled with a transmission optical fiber between the remote gain unit and the optical preamplifier; the control unit is in signal connection with the optical power amplifier, the optical preamplifier and the channel associated pumping unit and is used for configuring the gain and/or the output power of the optical power amplifier, the optical preamplifier and the channel associated pumping unit;
the channel associated pumping unit comprises a channel associated remote pumping module, the channel associated remote pumping module is used for providing remote pumping light which can reach the remote gain unit, and the remote gain unit amplifies the signal light by using the remote pumping light from the channel associated remote pumping module.
The channel associated pumping unit also comprises a channel associated Raman pumping module and a channel associated wave combiner, wherein the channel associated Raman pumping module outputs Raman pumping light, is used for carrying out equidirectional distributed Raman amplification on the remote pumping light output by the channel associated remote pumping module and carrying out reverse distributed Raman amplification on the signal light output by the remote gain unit; the channel-associated combiner is used for combining and outputting the remote pumping light output by the channel-associated remote pumping module and the Raman pumping light output by the channel-associated Raman pumping module.
The optical amplification component further comprises a forward Raman pumping unit, wherein the forward Raman pumping 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 equidirectional distributed Raman amplification on signal light output by the optical power amplifier; the control unit is further configured to configure the output power of the forward raman pumping unit.
The optical amplification assembly further comprises at least one bypass pumping unit, each bypass pumping unit is connected with the remote gain unit through a transmission fiber, and the control unit is further used for configuring the output power of the bypass pumping unit.
Wherein the bypass pumping unit comprises a bypass remote pumping module for providing additional remote pumping light that is accessible to the remote gain unit, the remote gain unit further amplifying the signal light with the additional remote pumping light from the bypass remote pumping module.
The bypass pumping unit further comprises a bypass Raman pumping module and a bypass combiner, wherein the bypass Raman pumping module outputs Raman pumping light for carrying out homodromous distributed Raman amplification on additional remote pumping light output by the bypass remote pumping module; the bypass combiner is used for combining and outputting the additional remote pumping light output by the bypass remote pumping module and the Raman pumping light output by the bypass Raman pumping module.
The transmission optical fiber adopted by the unrepeatered transmission system is a single mode optical fiber.
The channel-associated Raman 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 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 optical power amplifier is an erbium-doped fiber amplifier or an erbium-doped waveguide optical amplifier, and the optical preamplifier is an erbium-doped fiber amplifier or an erbium-doped waveguide optical amplifier.
The remote gain unit is a doped gain medium unit, and a 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, the present invention also provides a relay-less transmission method, which is implemented by the relay-less transmission system as described above.
The unrepeatered transmission system and the unrepeatered transmission method comprehensively apply a doped medium optical amplification technology, an optical fiber distributed Raman amplification technology and a remote optical pumping amplification technology, utilize the doped medium optical amplifier as an optical power amplifier and an optical preamplifier, respectively improve the optical power of signal light entering a fiber and the sensitivity of an optical receiver, apply the optical fiber distributed Raman amplification technology to perform distributed Raman amplification on the signal light and the remote pumping light in a transmission fiber, simultaneously apply a gain medium of a remote gain unit in a transmission link to perform remote passive amplification on the signal light, effectively ensure the detection capability of an optical fiber hydrophone array on weak signals, and greatly prolong the unrepeatered transmission distance of the dense 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 in connection with the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of the 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 indicate like elements. The drawings in the following description are directed to some, but not all embodiments of the invention. For a person skilled in the art, other figures can be derived from these figures without inventive effort.
Fig. 1 schematically shows a schematic structural diagram of an embodiment of the unrepeatered transmission system of the present invention;
fig. 2 schematically shows a schematic configuration of an associated pumping unit;
fig. 3 schematically shows a structural diagram of a second embodiment of the unrepeatered transmission system of the present invention;
fig. 4 schematically shows a structural diagram of a third embodiment of the unrepeatered transmission system of the present invention;
fig. 5 schematically shows a configuration of a fourth embodiment of the unrepeatered transmission system of the present invention;
fig. 6 schematically shows a schematic configuration of a fifth embodiment of the unrepeatered transmission system of the present invention;
FIG. 7 schematically illustrates a structure of a bypass pumping unit;
fig. 8 exemplarily shows a schematic structural diagram of a sixth embodiment of the unrepeatered transmission system of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.
In order to meet the requirement of unrepeatered transmission of an optical fiber hydrophone array over hundreds of kilometers, the invention provides a unrepeatered 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 fiber-in optical power of signal light and the sensitivity of an optical receiver, applies the optical fiber distributed Raman amplification technology to carry out distributed Raman amplification on the signal light and the remote pumping light in a transmission optical fiber, meanwhile, the remote gain unit is used for remotely and passively amplifying the signal light by using a gain medium in the transmission link, the comprehensive application of the three technologies enables the optical signal-to-noise ratio degradation of the system to be minimum, breaks through the limitation of the traditional optical amplification method on the unrepeatered transmission distance, and meets the requirement of the submarine shore-based fixed optical fiber sonar system on the unrepeatered transmission over hundreds of kilometers.
The unrepeatered transmission system and method for a fiber optic 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 an unrepeatered transmission system for a fiber optic hydrophone array according to the present invention, as shown in fig. 1, the unrepeatered transmission system includes an optical transmitter 1, an optical amplification component 2, a fiber optic hydrophone array 3, a remote gain unit 4, and an optical receiver 5, which are sequentially connected by a transmission fiber, wherein the remote gain unit 4 and the fiber optic hydrophone array 3 are located at a wet end, and the optical transmitter 1, the optical receiver 5, and the optical amplification component 2 are located at a dry end. After being amplified by the optical amplification component 2, the signal light emitted by the optical transmitter 1 sequentially passes through the transmission optical fiber 10a in front of the optical fiber hydrophone array 3, the optical fiber hydrophone array 3 and 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 amplification component 2 for further amplification through the transmission optical fiber 10c, and finally enters the optical receiver 5 for reception.
The remote gain unit 4 is a doped gain medium unit, and its core component is a doped gain medium device, which can amplify the signal light 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 an erbium-doped waveguide or other doped gain medium. The remote gain unit 4 is also a passive module, requiring no power supply, and is typically installed in a marine cable closure or an array cable closure.
In the embodiment shown in fig. 1, the optical amplification assembly 2 includes a control unit 21, an optical power amplifier 22, an optical preamplifier 23 and a follower pump unit 24, the optical power amplifier 22 is connected with the output end of the optical transmitter 1 by an optical fiber, and is connected with the optical fiber hydrophone array 3 by a transmission optical fiber 10 a; the optical preamplifier 23 is connected to the remote gain unit 4 via the transmission fiber 10c and to the input fiber of the optical receiver 5; the channel associated pumping unit 24 is optically coupled with the transmission fiber 10c between the remote gain unit 4 and the optical preamplifier 23, that is, the remote pumping light emitted by the channel associated pumping unit 24 is coupled into the transmission fiber 10c through a wavelength division multiplexing device; the control unit 21 is in signal connection with the optical power amplifier 22, the optical preamplifier 23 and the channel associated pump unit 24, and is configured to configure parameters such as gain and/or output power of the optical power amplifier 22, the optical preamplifier 23 and the channel associated pump unit 24.
The optical power amplifier 22 is used to increase the fiber-incoming optical power, and the optical preamplifier 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 fiber amplifier, or an erbium-doped waveguide optical amplifier or other type of doped medium optical amplifier; accordingly, the optical preamplifier 23 may be a conventional erbium-doped fiber amplifier, an erbium-doped waveguide amplifier, or other type of doped medium optical amplifier.
The associated pumping unit 24 includes an associated remote pumping module 241, the associated remote pumping module 241 is configured to provide remote pumping light to the remote gain unit 4, and the remote gain unit 4 amplifies the optical signal by using the remote pumping light from the associated remote gain module 24. Specifically, the on-path remote pump module 241 is configured to provide remote pump light, which is transmitted in the transmission fiber 10c in the opposite direction to the signal light and reaches the remote gain unit 4, and the remote gain unit 4 amplifies the signal light by using the interaction of the gain medium of the remote gain unit with the remote pump light and the signal light.
Since 1550nm band signal light can be amplified by optical amplifiers to increase optical power and the inherent attenuation per unit distance in standard single mode optical fiber is lower, 1550nm band signal light is often used in long distance signal transmission. For example, for the erbium-doped gain medium, to amplify the signal light in 1550nm band, the pump light is typically 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 set of the associated remote pump module 241 is typically selected to be in 1480nm band.
When the optical fiber amplifier works, signal light emitted by the optical transmitter 1 is amplified by the optical power amplifier 22, then 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, is amplified again, and then enters the transmission optical fiber 10 c; the signal is transmitted to the optical preamplifier 23 via the transmission fiber 10c, is further amplified, 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 achieve, the optical power can be well solved through an optical amplifier, and the optical signal-to-noise ratio is difficult to meet the expectation. The invention adopts the remote optical pumping amplification technology to ensure that the amplification is obtained under the condition of higher signal light power, reduces the degradation of remote transmission to the optical signal-to-noise ratio and greatly prolongs 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 pumping unit 24 in the present invention, and in this embodiment, the along-path pumping unit 24 includes a along-path remote pumping module 241, a along-path raman pumping module 242, and a along-path combiner 243.
As shown in fig. 1 and fig. 2, the associated remote pump module 241 is configured to provide remote pump light that can reach the remote gain module 4, the remote pump light is transmitted in the transmission fiber 10c in a direction opposite to the signal light, and reaches the remote gain module 4, and the signal light is amplified by using the interaction between the gain medium and the remote pump light and the signal light. The associated raman pump module 242 is configured to provide raman pump light that is transmitted in the transmission fiber 10c in the same direction as the remote pump light output by the associated remote pump module 241, i.e., the raman pump light is transmitted in the transmission fiber 10c in the opposite direction to the signal light output by the remote gain module 4. The raman pump light emitted from the associated raman pump module 242 is applied to perform the equidirectional distributed raman amplification on the remote pump light output from the associated remote pump module 241, and perform the inverse distributed raman amplification on the signal light output from the remote gain unit 4. The channel-associated combiner 243 is configured to combine the remote pump light output by the channel-associated remote pump module 241 with the raman pump light output by the channel-associated raman pump module 242 and output the combined light.
Illustratively, the on-channel raman pump module 242 includes one or more of a first-order raman pump laser source set, a second-order raman pump laser source set, and a third-order raman pump laser source set, for example, only the first-order raman pump laser source set, the first-order raman pump laser source set and the second-order raman pump laser source set, and the first-order raman pump laser source set, the second-order raman pump laser source set, and the third-order raman pump laser source set may be included. 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 12 xxnm.
For optical fiber distributed Raman amplification, a gain spectrum is a continuous spectrum, a peak gain wavelength is about 100nm longer than a provided Raman pumping wavelength, a gain bandwidth is about 300nm, distributed Raman amplification is carried out on remote pumping light in a 1480nm band and signal light in a 1550nm band, the wavelength of the Raman pumping light is 14xxnm, and the Raman pumping light is a first-order Raman pumping laser source group; the wavelength of the second-order Raman pump laser source group is 13xxnm, and distributed Raman amplification is carried out on the first-order Raman pump laser source group 14xxnm Raman pump light; the wavelength of the third-order Raman pump laser source group is 12xxnm, and distributed Raman amplification is carried out on the 13xxnm Raman pump light of the second-order Raman pump laser source group.
Fig. 3 shows a schematic structural diagram of a second embodiment of the unrepeatered transmission system of the present invention, and compared with the embodiment shown in fig. 1, in this embodiment, the optical amplification module 2 further includes a forward raman pumping unit 25. Correspondingly, the structure of the associated 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 associated pumping unit 24 includes the associated remote pumping module 241, the associated raman pumping module 242, and the associated combiner 243.
Specifically, the forward raman pumping unit 25 is optically coupled to the transmission fiber 10a between the optical power amplifier 22 and the fiber hydrophone array 3, that is, the raman pumping light emitted by the forward raman pumping unit 25 is coupled into the transmission fiber 10a through a wavelength division multiplexing device, and is used for performing the same-direction distributed raman amplification on the signal light output by the optical power amplifier 22. The forward raman pumping unit 25, the control unit 21, the optical power amplifier 22, the optical preamplifier 23, and the channel associated pumping unit 24 are all located at the trunk end, and the forward raman pumping unit 25 is also in signal connection with the control unit 21, and the control unit 21 configures parameters such as the output power of the pumping laser source group of the forward raman pumping unit 25.
Illustratively, the forward raman pump unit 25 includes one or more of a first-order raman pump laser source set, a second-order raman pump laser source set, and a third-order raman pump laser source set, for example, the first-order raman pump laser source set may be included only, the first-order raman pump laser source set and the second-order raman pump laser source set may be included, and the first-order raman pump laser source set, the second-order raman pump laser source set, and the third-order raman pump laser source set may be included. 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 12 xxnm. In an alternative embodiment, the forward raman pump unit 25 comprises a first order raman pump laser source bank emitting raman pump light in the 14xxnm band.
Specifically, the raman pump light emitted from 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 fiber-in optical power can be reduced. The size of the fiber-entering optical power is closely related to the nonlinear effect of the optical fiber, so that the fiber-entering optical power 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 transmitting the signal light for a longer distance.
In the unrepeatered transmission system of the present invention, the optical amplification module 2 may further include at least one bypass pumping 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 pumping units 26 are provided on the basis of the unrepeatered transmission system structure of the embodiment shown in fig. 1; the embodiment shown in fig. 5 is based on the embodiment shown in fig. 3, and a bypass pump unit 26 is provided; the embodiment shown in fig. 6 is an unrepeatered transmission system formed by adding two bypass pump units 26 to the optical amplification module 2 of the embodiment shown in fig. 3.
4-6, each bypass pumping unit 26 is located at the dry end and is connected to the remote gain unit 4 through the transmission fiber 10d, i.e. a plurality of bypass pumping units 26 are connected in parallel. Correspondingly, the control unit 21 is also used to configure parameters such as the output power of the pump laser source group bypassing the pumping unit 26.
In an alternative embodiment, bypass pump unit 26 includes a bypass remote pump module 261, bypass remote pump module 261 being configured to provide additional remote pump light, e.g., in the 1480nm band, that is accessible to remote gain unit 4, and remote gain unit 4 further amplifies the signal light with the additional remote pump light from bypass remote pump module 261. The additional remote pump light provided by remote pump module 261 is bypassed to increase the gain of the signal light in remote gain unit 4, providing support for transmitting the signal light over greater distances.
Fig. 7 shows a schematic diagram of a specific embodiment of the bypass pump unit 26, in this embodiment, the bypass pump unit 26 includes a bypass remote pump module 261, a bypass raman pump module 262 and a bypass combiner 263. The bypass raman pumping module 262 outputs raman pumping light, which is used to perform equidirectional distributed raman amplification on the additional remote pumping light output by the bypass remote pumping module 261 in the transmission fiber 10d, so as to further increase the remote pumping light power of 1480nm band reaching the remote gain unit 4; the bypass combiner 263 is configured to combine and output the additional remote pump light output by the bypass remote pump module 261 and the raman pump light output by the bypass raman pump module 262.
Illustratively, the bypass raman pumping module 262 includes one or more of a first-order raman pumping laser source set, a second-order raman pumping laser source set, and a third-order raman pumping laser source set, for example, only the first-order raman pumping laser source set, the first-order raman pumping laser source set and the second-order raman pumping laser source set, the first-order raman pumping laser source set, the second-order raman pumping laser source set, and the third-order raman pumping laser source set may be included. 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 12 xxnm. Referring back to the embodiment shown in fig. 4 and 6, if the bypass pumping unit 26 in this embodiment adopts the structure shown in fig. 7, the power of the pump light in the 1480nm band reaching the remote gain unit 4 can be further increased, that is, the gain of the signal light in the remote gain unit 4 is further increased, the power level of the signal light is increased, and the transmission distance of the signal light is further extended.
Fig. 8 shows a schematic structural diagram of a sixth specific embodiment of the unrepeatered transmission system of the present invention, in this embodiment, the optical amplification assembly 2 of the unrepeatered transmission system includes a follower pump unit 24, a forward raman pump unit 25, and a bypass pump unit 26. At this time, the associated pumping unit 24 may include the associated remote pumping module 241, the associated raman pumping module 242, and the associated combiner 243 as shown in the figure, or may include only the associated remote pumping module 241; the bypass pumping unit 26 may include a bypass remote pumping module 261, a bypass raman pumping module 262 and a bypass combiner 263, or may include only the bypass remote pumping module 261.
It should be noted that the transmission fiber used in the unrepeatered transmission system of the present invention is a single mode fiber, and for example, may be a g.652 or g.654 single mode fiber.
Illustratively, if the length of the transmission fiber 10a between the optical power amplifier 22 and the fiber hydrophone array 3 is L1, the length of the transmission fiber 10b between the 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 pumping unit 26 and the remote gain unit 4 is L4, the following relationships are satisfied:
l1 is L2+ L3, and L2 is more than or equal to 0; l4 ═ L3.
The invention also provides a non-relay transmission method for the optical fiber hydrophone array, which is realized by the non-relay transmission system. In the unrepeatered transmission method, an optical fiber distributed Raman amplification technology, a doped medium optical amplification technology and a remote pump optical amplification technology are comprehensively applied, and the method specifically comprises the following steps:
the optical power amplifier 22 amplifies the power of the signal light emitted by the optical transmitter 1, and then transmits the signal light through the transmission optical fiber 10 a;
the forward raman pump unit 25 outputs raman pump light into the transmission fiber 10a, and performs homodromous distributed raman amplification on the signal light in the transmission fiber 10 a; the signal light after the homodromous distributed Raman amplification is transmitted to a remote gain unit 4 through an optical fiber hydrophone array 3;
the remote gain unit 4 amplifies the signal light by utilizing the interaction between the gain medium of the remote gain unit and the remote pump light emitted by the channel-associated pump unit 24 or the remote pump light emitted by the channel-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 the transmission direction of the signal light;
the raman pump light emitted by the associated raman pump module 242 in the associated pump unit 24 performs the equidirectional distributed raman amplification on the remote pump light emitted by the associated remote pump module 241 in the transmission fiber 10c, and performs the reverse distributed raman amplification on the signal light output by the remote gain unit 4;
if the bypass pumping modules 26 are provided, the bypass raman pumping module 262 in each bypass pumping module 26 performs the same-direction distributed raman amplification on the additional remote pumping light emitted by the bypass remote pumping module 261 in the respective transmission fiber 10 d;
the optical preamplifier 23 performs a preventive amplification again on the signal light transmitted from the transmission fiber 10c, and then transmits the signal light to the optical receiver 5.
The above-described aspects may be implemented individually or in various combinations, and such variations 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 an …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Finally, it should be noted that: the above examples are only for illustrating the technical solutions of the present invention, and are not limited thereto. Although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (13)
1. An unrepeatered transmission system for a fiber optic hydrophone array, the unrepeatered transmission system comprising an optical transmitter (1), an optical amplification component (2), a fiber optic hydrophone array (3), a remote gain unit (4) and an optical receiver (5) connected in sequence by a transmission fiber, the remote gain unit (4) and the fiber optic hydrophone array (3) being located at a wet end, the optical transmitter (1), the optical receiver (5) and the optical amplification component (2) being located at a dry end; the optical amplification component (2) amplifies the signal light emitted by the optical transmitter (1) and transmits the signal light to the optical fiber hydrophone array (3), and the signal light output by the optical fiber hydrophone array (3) is amplified by the remote gain unit (4), transmitted to the optical amplification component (2), amplified by the optical amplification component (2) and 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 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 for improving the fiber-incoming optical power; the optical preamplifier (23) is connected with the remote gain unit (4) through a transmission optical fiber and is connected with an input end optical fiber of the optical receiver (5) for improving the sensitivity of the optical receiver (5); the channel associated pumping unit (24) is optically coupled to a transmission fiber between the remote gain unit (4) and the optical preamplifier (23); the control unit (21) is in signal connection with the optical power amplifier (22), the optical preamplifier (23) and the channel associated pumping unit (24) and is used for configuring the gain and/or the output power of the optical power amplifier (22), the optical preamplifier (23) and the channel associated pumping unit (24);
the on-path pumping unit (24) comprises an on-path remote pumping module (241), the on-path remote pumping module (241) is used for providing remote pumping light which can reach the remote gain unit (4), and the remote gain unit (4) amplifies signal light by using the remote pumping light from the on-path remote pumping module (241).
2. The unrepeatered transmission system of claim 1, wherein the associated pumping unit (24) further comprises an associated raman pumping module (242) and an associated combiner (243), the associated raman pumping module (242) outputting raman pumping light for in-phase distributed raman amplification of the remote pumping light output by the associated remote pumping module (241) and for inverse distributed raman amplification of the signal light output by the remote gain unit (4); the channel-associated combiner (243) is used for combining and outputting the remote pumping light output by the channel-associated remote pumping module (241) and the Raman pumping light output by the channel-associated Raman pumping module (242).
3. The unrepeatered transmission system of claim 1, wherein the optical amplification 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 co-directional distributed raman amplification of the signal light output by the optical power amplifier (22);
the control unit (21) is further configured for configuring the output power of the forward Raman pump unit (25).
4. The unrepeatered transmission system according to claim 1, wherein the optical amplification 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) further being configured for configuring the output power of the bypass pump unit (26).
5. The unrepeatered transmission system of claim 4, wherein the bypass pump unit (26) comprises a bypass remote pump module (261), the bypass remote pump module (261) being configured to provide additional remote pump light that is accessible to the remote gain unit (4), the remote gain unit (4) amplifying signal light with the additional remote pump light from the bypass remote pump module (261).
6. The unrepeatered transmission system of claim 5, 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 codirectionally distributed Raman amplification of additional remote pump light output by the bypass remote pump module (261); the bypass combiner (263) is used for combining and outputting the additional remote pumping light output by the bypass remote pumping module (261) and the Raman pumping light output by the bypass Raman pumping module (262).
7. The unrepeatered transmission system of claim 1 wherein the transmission fiber employed by the unrepeatered transmission system is a single mode fiber.
8. The unrepeatered transmission system of claim 2, wherein the channel-associated raman pump module (242) 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.
9. The unrepeatered transmission system of claim 3, wherein the forward Raman pump unit (25) comprises one or more of a first order Raman pumped laser source bank, a second order Raman pumped laser source bank, and a third order Raman pumped laser source bank.
10. The unrepeatered transmission system of claim 6 wherein the bypass Raman pump module (262) comprises one or more of a first order Raman pumped laser source bank, a second order Raman pumped laser source bank, and a third order Raman pumped laser source bank.
11. The unrepeatered transmission system of claim 1, wherein the optical power amplifier (22) is an erbium-doped fiber amplifier or an erbium-doped waveguide optical amplifier and the optical pre-amplifier (23) is an erbium-doped fiber amplifier or an erbium-doped waveguide optical amplifier.
12. The unrepeatered transmission system of claim 1, wherein the remote gain unit (4) is a doped gain medium unit and the gain medium in the remote gain unit (4) is an erbium doped fiber or a erbium doped waveguide device.
13. A method for unrepeatered transmission, wherein the method is implemented by the unrepeatered transmission system of any one of claims 1-12.
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| CN202011388487.7A CN112653518A (en) | 2020-12-02 | 2020-12-02 | Unrepeatered transmission system and method for optical fiber hydrophone array |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115987399A (en) * | 2023-03-20 | 2023-04-18 | 北京神州普惠科技股份有限公司 | Optical fiber hydrophone transmission system and optical signal transmission method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115987399A (en) * | 2023-03-20 | 2023-04-18 | 北京神州普惠科技股份有限公司 | Optical fiber hydrophone transmission system and optical signal transmission method |
| CN115987399B (en) * | 2023-03-20 | 2023-08-11 | 北京神州普惠科技股份有限公司 | Optical fiber hydrophone transmission system and optical signal transmission method |
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