CN112600619B - 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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- CN112600619B CN112600619B CN202011393034.3A CN202011393034A CN112600619B CN 112600619 B CN112600619 B CN 112600619B CN 202011393034 A CN202011393034 A CN 202011393034A CN 112600619 B CN112600619 B CN 112600619B
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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 enters the transmission optical fiber for distributed Raman amplification after being amplified by the remote gain unit and then is transmitted to the optical receiver after being amplified by the optical amplification component. The invention comprehensively applies the doped medium optical amplification technology, the optical fiber distributed Raman amplification technology and the remote optical pumping amplification technology, ensures the detection capability of the optical fiber hydrophone array on weak signals, and greatly prolongs 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 with the development of a shore-based fixed optical fiber sonar system towards a large scale and a long distance, the array mostly adopts a multiplexing mode of multi-wavelength division, less time division and less space division, the duty ratio of an optical transmitter output optical pulse or an optical pulse pair is improved by reducing the time division, the peak power of the optical pulse or the optical pulse pair is reduced under the same average optical power, and the nonlinear effect of the optical fiber is reduced while the fiber-in optical power is improved; by reducing space division, the use of amplifiers is reduced, and the complexity and cost of the system are reduced.
Taking a single space division multiplexing 128-element optical fiber hydrophone array as an example, two multiplexing modes of 16 wavelength division multiplied by 8 time division and 8 wavelength division multiplied by 16 time division are mainly adopted, the inherent loss is about 25dB, but the maximum single wave input fiber power supported by the former is nearly 3dB greater than that supported by the latter, and the system performance is better. As fiber optic hydrophone arrays grow in size, adding wavelength division rather than time and space division is a more preferred option. However, increasing the wavelength division means that the optical bandwidth of the system is increased, and taking the 1.6nm wavelength channel interval as an example, the optical bandwidth of 16 wavelength division reaches 24nm, and the gain flatness of the amplifier in the optical bandwidth of the system is difficult to control, which affects the consistency of the system performance.
As the number of single space division multiplexing elements increases, the inherent loss of the fiber optic hydrophone array itself increases. 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 65 dB.
Traditionally, unrepeatered transmission systems based on centralized active erbium-doped fiber amplifiers or distributed fiber raman amplifiers have failed to fulfill the large bandwidth 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 on weak signals, large-bandwidth analog optical signals transmitted over long distances must be effectively amplified. Therefore, a relay-less transmission system is needed, which not only can realize effective balanced amplification of the large-bandwidth analog optical signal 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 large-bandwidth unrepeatered transmission system and method of a submarine shore-based optical fiber sonar which can meet the requirement of being more than one hundred kilometers offshore.
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 enters a transmission optical fiber for distributed Raman amplification after being amplified by the remote gain unit, and then is transmitted to the optical receiver after being amplified by the optical amplification component;
the optical amplification assembly comprises a control unit, an optical power amplifier, an optical preamplifier, a backward Raman pumping unit and at least one bypass remote 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 fiber-in optical power; 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 backward Raman pumping unit is optically coupled with a transmission optical fiber between the remote gain unit and the optical preamplifier; each bypass remote pumping unit is connected with the remote gain unit through a transmission optical fiber; the control unit is in signal connection with the optical power amplifier, the optical preamplifier, the backward Raman pumping unit and the bypass remote pumping unit and is used for configuring the gain and/or the output power of the optical power amplifier, the optical preamplifier, the backward Raman pumping unit and the bypass remote pumping unit;
the backward Raman pump unit outputs Raman pump light for performing reverse distributed Raman amplification on the signal light output by the remote gain unit;
the bypass remote pump unit is configured to provide remote pump light that is accessible to the remote gain unit, and the remote gain unit amplifies the signal light with the remote pump light from the bypass remote pump unit.
The optical amplification assembly further comprises at least one bypass Raman pumping unit, the bypass Raman pumping unit is optically coupled with the transmission fiber between the bypass remote pumping unit and the remote gain unit, and the bypass Raman pumping units and the bypass remote pumping units are arranged in one-to-one correspondence; the bypass Raman pumping unit outputs Raman pumping light which is used for carrying out equidirectional distributed Raman amplification on the remote pumping light output by the bypass remote pumping unit.
The bypass 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 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 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 backward 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 transmission optical fiber adopted by the unrepeatered transmission system is a single mode optical fiber.
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 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 to 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 pumping light in a transmission fiber, simultaneously apply a gain medium of a remote gain module in a transmission link to perform remote passive amplification on the signal light, and only one optical amplification effect exists in any node or any section of the transmission fiber in the system, thereby avoiding the cross influence of multiple optical amplification effects, facilitating the realization of effective balanced amplification of large-bandwidth analog optical signals, ensuring the detection capability of an optical fiber hydrophone array on weak signals, and greatly prolonging the unrepeatered transmission of an intensive multiplexing optical fiber hydrophone array in a shore-based fixed optical fiber sonar system Distance.
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. To a person skilled in the art, without inventive effort, other figures can be derived from these figures.
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 structural diagram of a second embodiment of the unrepeatered transmission system of the present invention;
fig. 3 schematically shows a structural diagram of a third embodiment of the unrepeatered transmission system of the present invention;
fig. 4 schematically shows a structural diagram of a fourth embodiment of the unrepeatered transmission system of the present invention;
fig. 5 exemplarily shows a schematic structural diagram of a fifth 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 non-relay transmission requirement of an optical fiber hydrophone array exceeding hundreds of kilometers, the invention provides a non-relay transmission system for the optical fiber hydrophone array, which comprehensively applies a high-order optical fiber distributed Raman amplification technology, a doped medium optical amplification technology and a remote optical pumping amplification technology, utilizes the 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 pump light in a transmission optical fiber, simultaneously applies a gain medium of a remote gain module in a transmission link to carry out remote passive amplification on the signal light, and any node or any section of the transmission optical fiber in the system only has one optical amplification effect, thereby fundamentally avoiding the cross influence of various optical amplification effects, and the comprehensive application of the three technologies ensures that the optical signal to noise ratio of the system is degraded to the minimum, the method breaks through the limitation of the traditional optical amplification method on the unrepeatered transmission distance, ensures the consistency of the system performance in a large bandwidth, and realizes the large-bandwidth unrepeatered transmission vision of the submarine shore-based optical fiber sonar system exceeding hundred kilometers.
The unrepeatered transmission system and method for a fiber optic hydrophone array provided by the invention are described in detail below 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 distributed raman amplification is carried out in the transmission optical fiber 10c, and then the signal light enters the optical amplification component 2 for further amplification 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, which 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, does not need to be powered and can be installed in a sea cable closure or an array cable closure in general.
In the embodiment shown in fig. 1, the optical amplification assembly 2 comprises a control unit 21, an optical power amplifier 22, an optical preamplifier 23, a backward raman pumping unit 24 and at least one bypass remote pumping unit 25, the optical power amplifier 22 is connected with the output end of the optical transmitter 1 by optical fibers and is connected with the fiber hydrophone array 3 by a transmission fiber 10a for increasing the fiber-incoming optical power; the optical preamplifier 23 is connected with the remote gain unit 4 through the transmission optical fiber 10c, and is connected with the input end optical fiber of the optical receiver 5, and is used for improving the sensitivity of the optical receiver 5; the backward raman 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 raman pumping light emitted from the backward raman pumping unit 24 is coupled into the transmission fiber 10c through a wavelength division multiplexing device; each bypass remote pumping unit 25 is connected to the remote gain unit 4 by a transmission fiber 10 d; the control unit 21 is in signal connection with the optical power amplifier 22, the optical preamplifier 23, the backward raman pumping unit 24 and the bypass remote pumping unit 25, and is configured to configure parameters such as gain and/or output power of the optical power amplifier 22, the optical preamplifier 23, the backward raman pumping unit 24 and the bypass remote pumping unit 25.
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 backward raman pump unit 24 is configured to provide raman pump light for performing inverse distributed raman amplification on the signal light output from the remote gain unit 4. Specifically, the raman pump light output to the raman pump unit 24 for applying the inverse distributed raman amplification to the signal light output from the remote gain block 4 is transmitted in the transmission fiber 10c in the direction opposite to the transmission direction of the signal light output from the remote gain block 4.
Illustratively, backward raman pump unit 24 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 may be included, 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.
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.
The bypass remote pump unit 25 is used to provide remote pump light, for example, remote pump light in the 1480nm band, which can reach the remote gain unit 4, and the remote gain unit 4 amplifies the signal light using the remote pump light from the bypass remote pump unit 25. In particular, bypass remote pump unit 25 is used to provide remote pump light that reaches remote gain unit 4 through transmission fiber 10d, and remote gain unit 4 amplifies signal light by virtue of the interaction of its gain medium with the remote pump light and the signal light.
In the unrepeatered transmission system of the present invention, the optical amplification module 2 may further include at least one bypass raman pumping unit 26 in signal connection with the control unit 21, fig. 2 shows a schematic structural diagram of a second embodiment of the unrepeatered transmission system of the present invention, and fig. 3 shows a schematic structural diagram of a third embodiment of the unrepeatered transmission system of the present invention. Referring collectively to fig. 2 and 3, bypass raman pump units 26 are optically coupled to the transmission fiber between bypass remote pump units 25 and remote gain unit 4, and bypass raman pump units 26 are arranged in one-to-one correspondence with bypass remote pump units 25, i.e., the number of bypass raman pump units 26 corresponds to the number of bypass remote pump units 25.
The bypass raman pumping unit 26 outputs raman pump light for use in the co-directional distributed raman amplification of the remote pump light output by the bypass remote pumping unit 25. Specifically, the bypass raman pumping unit 26 outputs raman pumping light, and performs distributed raman amplification on the remote pumping light output by the bypass remote pumping unit 25 in the transmission fiber 10d in the same direction, so as to increase the power of the remote pumping light in the 1480nm band reaching the remote gain unit 4, thereby increasing the gain of the signal light in the remote gain unit 4, increasing the power level of the signal light, and further extending the transmission distance of the signal light.
Illustratively, the bypass raman pumping unit 26 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, may include only the first-order raman pumping laser source set, may include the first-order raman pumping laser source set and the second-order raman pumping laser source set, and may include 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. 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.
Fig. 4 shows a schematic structural diagram of a fourth 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 27. Correspondingly, the structure of the unrepeatered transmission system shown in fig. 3 may be integrated with the unrepeatered transmission system shown in fig. 4, that is, in the unrepeatered transmission system including the bypass raman pumping unit 26, the forward raman pumping unit 27 is further added, that is, the unrepeatered transmission system of the fifth embodiment shown in fig. 5 is obtained.
As shown in fig. 4 and fig. 5, the forward raman pumping unit 27 is coupled to the transmission fiber light 10a between the optical power amplifier 22 and the fiber hydrophone array 3, that is, the raman pumping light emitted from the forward raman pumping unit 27 is coupled into the transmission fiber 10a through a wavelength division multiplexing device, and is used for performing equidirectional distributed raman amplification on the signal light output from the optical power amplifier 22. The forward raman pumping unit 27, the control unit 21, the optical power amplifier 22, the optical preamplifier 23, the backward raman pumping unit 24, and the bypass remote pumping unit 25 are all located at the trunk end, and the forward raman pumping unit 27 is also in signal connection with the control unit 21, and the control unit 21 configures parameters such as output power of the pumping laser source group of the forward raman pumping unit 27.
Illustratively, the forward raman pump unit 27 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 27 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 27 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.
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.
Exemplarily, 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;
when the forward raman pumping unit 27 is provided, the forward raman pumping unit 27 outputs raman pumping 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 bypass remote pump unit 25 and the signal light output by the optical fiber hydrophone array 3;
the raman pump light emitted from the backward raman pump unit 24 performs backward distributed raman amplification on the signal light output from the remote gain unit 4 in the transmission fiber 10 c;
when the bypass raman pumping unit 26 is provided, the bypass raman pumping unit 26 performs the equidirectional distributed raman amplification on the remote pumping light emitted by the bypass remote pumping unit 25 in the corresponding 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 (9)
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), the signal light output by the optical fiber hydrophone array (3) is amplified by the remote gain unit (4), enters a transmission optical fiber for distributed Raman amplification, is amplified by the optical amplification component (2) and then is transmitted to the optical receiver (5);
the optical amplification component (2) comprises a control unit (21), an optical power amplifier (22), an optical preamplifier (23), a backward Raman pumping unit (24) and at least one bypass remote pumping unit (25), 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-in 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); said backward Raman pump unit (24) is optically coupled to a transmission fiber between said remote gain unit (4) and said optical preamplifier (23); each of said by-pass remote pumping units (25) being connected to said remote gain unit (4) by a transmission fiber; the control unit (21) is in signal connection with the optical power amplifier (22), the optical preamplifier (23), the backward Raman pumping unit (24) and the bypass remote pumping unit (25) and is used for configuring the gain and/or the output power of the optical power amplifier (22), the optical preamplifier (23), the backward Raman pumping unit (24) and the bypass remote pumping unit (25);
the backward Raman pump unit (24) outputs Raman pump light for performing backward distributed Raman amplification on the signal light output by the remote gain unit (4);
the bypass remote pump unit (25) is used for providing remote pump light which can reach the remote gain unit (4), and the remote gain unit (4) amplifies signal light by using the remote pump light from the bypass remote pump unit (25);
the optical amplification assembly (2) further comprises at least one bypass raman pumping unit (26), the bypass raman pumping unit (26) is optically coupled to the transmission fiber between the bypass remote pumping unit (25) and the remote gain unit (4), and the bypass raman pumping units (26) and the bypass remote pumping units (25) are arranged in a one-to-one correspondence;
the bypass Raman pumping unit (26) outputs Raman pumping light, and the Raman pumping light is used for carrying out equidirectional distributed Raman amplification on the remote pumping light output by the bypass remote pumping unit (25);
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 the bypass raman pump unit (26) and the remote gain unit (4) is L4, the following relationships are satisfied:
l1= L2+ L3, and L2 is more than or equal to 0; l4= L3;
the optical amplification component (2) is located at the same dry end as the optical transmitter (1) and the optical receiver (5), and the control unit (21) is arranged between the optical power amplifier (22) and the optical preamplifier (23);
the bypass Raman pumping unit (26) comprises one or more of a second-order Raman pumping laser source set and a third-order Raman pumping laser source set;
the optical amplification assembly (2) further comprises a forward Raman pumping unit (27), wherein the forward Raman pumping unit (27) is optically coupled with a transmission fiber between the optical power amplifier (22) and the fiber hydrophone array (3) and is used for carrying out equidirectional distributed Raman amplification on 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 (27);
the forward Raman pumping unit (27) comprises one or more of a second-order Raman pumping laser source set and a third-order Raman pumping laser source set;
the backward Raman pumping unit (24) comprises one or more of a second-order Raman pumping laser source set and a third-order Raman pumping laser source set.
2. The unrepeatered transmission system of claim 1, wherein the bypass raman pump unit (26) comprises a first order raman pump laser source bank.
3. The unrepeatered transmission system of claim 1, wherein the optical amplification assembly (2) further comprises a forward raman pump unit (27), the forward raman pump unit (27) 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 (27).
4. The unrepeatered transmission system of claim 3, wherein the forward Raman pump unit (27) comprises a first order Raman pump laser source bank.
5. The unrepeatered transmission system of claim 1, wherein the backward raman pump unit (24) comprises a first order raman pump laser source bank.
6. The unrepeatered transmission system of claim 1 wherein the transmission fiber employed by the unrepeatered transmission system is a single mode fiber.
7. 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.
8. 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.
9. A method for unrepeatered transmission, wherein the method is implemented by the unrepeatered transmission system of any one of claims 1-8.
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| 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 |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001237776A (en) * | 2000-02-21 | 2001-08-31 | Kddi Corp | Light amplification relay transmission system and light transmission system using the same |
| CN1749838A (en) * | 2004-09-15 | 2006-03-22 | 华为技术有限公司 | Light transmission system and light amplifying method used therein |
| CN102223183A (en) * | 2011-08-05 | 2011-10-19 | 中国电子科技集团公司第三十四研究所 | Non-relay optical fiber transmission system and method |
| CN104319611A (en) * | 2014-11-19 | 2015-01-28 | 天津光电通信技术有限公司 | Low-noise remote pump EDFA |
| CN105262540A (en) * | 2015-07-24 | 2016-01-20 | 国家电网公司 | Multi-wavelength single span transmission method and system |
| CN106911394A (en) * | 2017-04-10 | 2017-06-30 | 中国电子科技集团公司第三十四研究所 | A kind of faint light remote-pumped amplifier based on double 1480nm lasers |
| CN106961305A (en) * | 2017-04-17 | 2017-07-18 | 中国电子科技集团公司第三十四研究所 | A kind of no-repeater optical fiber transmission system for bypassing positive Raman amplifiction |
| CN107294604A (en) * | 2017-05-26 | 2017-10-24 | 烽火通信科技股份有限公司 | A kind of single span long-distance WDM circuit optical fiber Transmission system |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6700696B2 (en) * | 2000-08-09 | 2004-03-02 | Jds Uniphase Corporation | High order fiber Raman amplifiers |
-
2020
- 2020-12-02 CN CN202011393034.3A patent/CN112600619B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001237776A (en) * | 2000-02-21 | 2001-08-31 | Kddi Corp | Light amplification relay transmission system and light transmission system using the same |
| CN1749838A (en) * | 2004-09-15 | 2006-03-22 | 华为技术有限公司 | Light transmission system and light amplifying method used therein |
| CN102223183A (en) * | 2011-08-05 | 2011-10-19 | 中国电子科技集团公司第三十四研究所 | Non-relay optical fiber transmission system and method |
| CN104319611A (en) * | 2014-11-19 | 2015-01-28 | 天津光电通信技术有限公司 | Low-noise remote pump EDFA |
| CN105262540A (en) * | 2015-07-24 | 2016-01-20 | 国家电网公司 | Multi-wavelength single span transmission method and system |
| CN106911394A (en) * | 2017-04-10 | 2017-06-30 | 中国电子科技集团公司第三十四研究所 | A kind of faint light remote-pumped amplifier based on double 1480nm lasers |
| CN106961305A (en) * | 2017-04-17 | 2017-07-18 | 中国电子科技集团公司第三十四研究所 | A kind of no-repeater optical fiber transmission system for bypassing positive Raman amplifiction |
| CN107294604A (en) * | 2017-05-26 | 2017-10-24 | 烽火通信科技股份有限公司 | A kind of single span long-distance WDM circuit optical fiber Transmission system |
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