CN114448498A - Relay-free submarine optical cable disturbance monitoring system based on remote pump amplifier - Google Patents
Relay-free submarine optical cable disturbance monitoring system based on remote pump amplifier Download PDFInfo
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- CN114448498A CN114448498A CN202210090377.5A CN202210090377A CN114448498A CN 114448498 A CN114448498 A CN 114448498A CN 202210090377 A CN202210090377 A CN 202210090377A CN 114448498 A CN114448498 A CN 114448498A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
- H04B10/071—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using a reflected signal, e.g. using optical time domain reflectometers [OTDR]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
- H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
- H04B10/079—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using measurements of the data signal
- H04B10/0795—Performance monitoring; Measurement of transmission parameters
- H04B10/07955—Monitoring or measuring power
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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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B13/00—Transmission systems characterised by the medium used for transmission, not provided for in groups H04B3/00 - H04B11/00
- H04B13/02—Transmission systems in which the medium consists of the earth or a large mass of water thereon, e.g. earth telegraphy
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0201—Add-and-drop multiplexing
- H04J14/0202—Arrangements therefor
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0278—WDM optical network architectures
- H04J14/0283—WDM ring architectures
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- Physics & Mathematics (AREA)
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- Optical Communication System (AREA)
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Abstract
The invention discloses a non-relay submarine optical cable disturbance monitoring system based on a cross-remote pump amplifier, which comprises shore-based equipment and an underwater remote pump amplifier, wherein the shore-based equipment is provided with a remote pump light source, a detection light source and an optical fiber interferometer which are interconnected, the optical fiber interferometer is sequentially connected with a sampling module and a demodulation module, an optical fiber reflector is arranged in the optical fiber interferometer, and the underwater remote pump amplifier is provided with a 1 multiplied by 2 coupler and a first optical circulator, a first wavelength division multiplexer WDM1, a first erbium-doped optical fiber EDF1, a second optical circulator, a second wavelength division multiplexer WDM2 and a second erbium-doped optical fiber EDF2 which are sequentially connected to form a closed loop. The system has the functions of monitoring the disturbance and the breakage of the optical cable in real time and positioning the breakpoint, is convenient to network and can realize the disturbance monitoring of the long-span unrepeatered submarine optical cable.
Description
Technical Field
The invention relates to a distributed optical fiber sensing technology, in particular to a submarine cable physical safety monitoring system for prolonging the disturbance monitoring distance of a non-relay submarine optical cable, and specifically relates to a non-relay submarine optical cable disturbance monitoring system based on a remote pump amplifier.
Background
Submarine optical cables are communication transmission cables laid on the seabed and are important components of the internet and other underwater optical networks. However, the submarine optical cable is also easily damaged, such as earthquake, damage of ship anchors and fishing nets, even artificial damage, and the like, so that equipment capable of monitoring the health and safety of the submarine optical cable in real time is needed to perform early warning and positioning on the damage behavior of the submarine optical cable. The optical cable disturbance monitoring technology used on land only supports a monitoring range of about 100km at most by single-end detection, the double-end detection can only reach 200km, and a non-relay submarine optical cable is usually more than 300km, so the optical cable disturbance monitoring technology used on land cannot meet the requirement of the ultra-long span monitoring range of the non-relay submarine optical cable, and an optical fiber link of the non-relay submarine optical cable adopts a far pump amplifier with unidirectional amplification, so that backward Rayleigh scattering signals cannot pass back across the far pump amplifier, which is one of factors limiting the disturbance monitoring distance limitation of the submarine optical cable.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a non-relay submarine optical cable disturbance monitoring system based on a trans-remote pump amplifier. The system has the functions of monitoring the disturbance and the breakage of the optical cable in real time and positioning the breakpoint, is convenient to network and can realize the disturbance monitoring of the long-span unrepeatered submarine optical cable.
The technical scheme for realizing the purpose of the invention is as follows:
a non-relay submarine optical cable disturbance monitoring system based on a remote pump amplifier comprises shore-based equipment and an underwater remote pump amplifier, wherein the shore-based equipment is provided with a remote pump light source, a detection light source and an optical fiber interferometer, the detection light source and the optical fiber interferometer are interconnected, the optical fiber interferometer is sequentially connected with a sampling module and a demodulation module, and an optical fiber reflector is arranged inside the optical fiber interferometer; the underwater remote pump amplifier is provided with a 1 × 2 coupler, a first optical circulator, a first Wavelength Division Multiplexer (WDM) 1, a first Erbium-Doped Fiber (EDF) 1, a second optical circulator, a second Wavelength Division multiplexer (WDM 2) and a second Erbium-Doped Fiber (EDF) 2 which are sequentially connected to form a closed loop, 2 ports of the first optical circulator are connected with an optical Fiber interferometer through a first section of transmission Fiber, the first Wavelength Division multiplexer (WDM 1) and the second Wavelength Division multiplexer (WDM 2) are respectively connected with the 1 × 2 coupler, the 1 × 2 coupler is connected with a remote pump light source in shore-based equipment through a remote pump transmission Fiber, wherein the remote pump light source, the 1 × 2 coupler, the first Wavelength Division multiplexer (WDM 1) and the first downlink Erbium-Doped Fiber (1) form a remote pump amplification unit, the remote pump light source, the 1 × 2 coupler, the second Wavelength Division multiplexer (2) and the second downlink Erbium-Doped Fiber (1) form an uplink remote pump amplification unit, the 2 ports of the second optical circulator are output ports and connected with a second section of transmission optical fiber, the first section of transmission optical fiber and the second section of transmission optical fiber are any same optical fiber in the unrepeatered submarine optical cable but can not be the same optical fiber with the far pump transmission optical fiber, and the first section of transmission optical fiber and the second section of transmission optical fiber are used for detecting the disturbance monitoring of long-distance transmission of optical signals.
The first optical circulator and the second optical circulator are respectively provided with three ports, wherein an optical signal entering from the port 1 is output from the port 2, an optical signal entering from the port 2 is output from the port 3, and the first optical circulator and the second optical circulator are used for a bidirectional transmission system to realize the sequential transmission of the optical signals along the specified ports.
The maximum value of the sum of the lengths of the first section of transmission optical fiber and the second section of transmission optical fiber is 200km, and the requirement of monitoring the disturbance single end of the submarine optical cable within 200km can be met.
The far pump transmission optical fiber is any one optical fiber in the unrepeatered submarine optical cable.
The operation method of the system comprises the following steps:
the detection light source generates detection light signals and injects the detection light signals into the optical fiber interferometer, the measurement arm port of the optical fiber interferometer sequentially outputs the detection light signals to the first section of transmission optical fiber, the detection light signals enter the downlink remote pump amplification unit of the optical circulator-based remote pump amplifier through the first optical circulator 2 port, the downlink remote pump amplification unit amplifies the power of the detection light signals, the detection light signals enter the second optical circulator 1 port, the detection light signals are output from the second optical circulator 2 port and enter the second section of transmission optical fiber, backward Rayleigh scattering signals generated by the second section of transmission optical fiber enter the second optical circulator 2 port and are output from the second optical circulator 3 port and enter the first optical circulator 1 port, the backward Rayleigh scattering signals are output from the first optical circulator 2 port and are transmitted back to the first section of transmission optical fiber, the backward Rayleigh scattering signals of the first section of transmission optical fiber and the backward Rayleigh scattering signals of the second section of transmission optical fiber are returned to the measurement arm port of the optical fiber interferometer, coherent signals output by an optical fiber interferometer enter a demodulation module through a sampling module, or a detection optical signal enters a first section of transmission optical fiber through a first optical circulator 2 port, is output from a first optical circulator 3 port, enters a downlink far pump amplification unit, the downlink far pump amplification unit performs power amplification on the detection optical signal, enters a second optical circulator 1 port, is output from a second optical circulator 2 port, enters a second section of transmission optical fiber, backward Rayleigh scattering signals generated by the second section of transmission optical fiber enter the second optical circulator 2 port, are output from the second optical circulator 3 port, enter an uplink far pump amplification unit, the uplink far pump amplification unit performs power amplification on the detection optical signal, enters the first optical circulator 1 port, is output from the first optical circulator 2 port, and is transmitted back to the first section of transmission optical fiber.
The remote pump light source in the shore-based equipment is connected with the remote pump amplifier through the remote pump transmission optical fiber to provide pumping energy for the remote pump amplifier, namely, the pumping light required by the remote pump amplifier is injected into a Wavelength Division Multiplexer (WDM) through a 1 multiplied by 2 coupler (or two paths of remote pump transmission optical fibers).
The system has the functions of monitoring the disturbance and the breakage of the optical cable in real time and positioning the breakpoint, is convenient to network and can realize the disturbance monitoring of the long-span unrepeatered submarine optical cable.
Drawings
Fig. 1 is a schematic structural diagram of the embodiment.
Detailed Description
The invention will be further elucidated with reference to the drawings and examples, without however being limited thereto.
Example (b):
referring to fig. 1, a non-relay submarine optical cable disturbance monitoring system based on a remote pump amplifier comprises shore-based equipment and an underwater remote pump amplifier, wherein the shore-based equipment is provided with a remote pump light source, a detection light source and an optical fiber interferometer which are interconnected, the optical fiber interferometer is sequentially connected with a sampling module and a demodulation module, and an optical fiber reflector is arranged inside the optical fiber interferometer; the underwater remote pump amplifier is provided with a 1 multiplied by 2 coupler, a first optical circulator, a first Wavelength Division Multiplexer (WDM) 1, a first Erbium-Doped Fiber (EDF) 1, a second optical circulator, a second WDM2 and a second Erbium-Doped Fiber (EDF) 2 which are sequentially connected to form a closed loop, wherein a 2 port of the first optical circulator is connected with an optical Fiber interferometer through a first section of transmission Fiber, the first WDM1 and the second WDM2 are respectively connected with the 1 multiplied by 2 coupler, the 1 multiplied by 2 coupler is connected with a remote pump light source in shore-based equipment through a remote pump transmission Fiber, wherein the remote pump light source, the 1 multiplied by 2 coupler, the first WDM1 and the first Erbium-Doped Fiber (EDF) 1 form a downlink remote pump amplification unit, the remote pump light source, the 1 multiplied by 2 coupler, the second WDM2 and the second EDF2 form an uplink remote pump amplification unit, the second section of the uplink remote pump light source is connected with the second section of the second WDM2 transmission Fiber, the first section of transmission optical fiber and the second section of transmission optical fiber are any same optical fiber in the unrepeatered submarine optical cable but can not be the same optical fiber with the far pump transmission optical fiber, and the first section of transmission optical fiber and the second section of transmission optical fiber are used for detecting the disturbance monitoring of the long-distance transmission of optical signals.
The first optical circulator and the second optical circulator are respectively provided with three ports, wherein an optical signal entering from the port 1 is output from the port 2, an optical signal entering from the port 2 is output from the port 3, and the first optical circulator and the second optical circulator are used for a bidirectional transmission system to realize the sequential transmission of the optical signals along the specified ports.
The maximum value of the sum of the lengths of the first section of transmission optical fiber and the second section of transmission optical fiber is 200km, and the requirement of monitoring the disturbance single end of the submarine optical cable within 200km can be met.
The far pump transmission optical fiber is any one optical fiber in the unrepeatered submarine optical cable.
The operation method of the system comprises the following steps:
the detection light source generates detection light signals and injects the detection light signals into the optical fiber interferometer, the measurement arm port of the optical fiber interferometer sequentially outputs the detection light signals to the first section of transmission optical fiber, the detection light signals enter the downlink remote pump amplification unit of the optical circulator-based remote pump amplifier through the first optical circulator 2 port, the downlink remote pump amplification unit amplifies the power of the detection light signals, the detection light signals enter the second optical circulator 1 port, the detection light signals are output from the second optical circulator 2 port and enter the second section of transmission optical fiber, backward Rayleigh scattering signals generated by the second section of transmission optical fiber enter the second optical circulator 2 port and are output from the second optical circulator 3 port and enter the first optical circulator 1 port, the backward Rayleigh scattering signals are output from the first optical circulator 2 port and are transmitted back to the first section of transmission optical fiber, the backward Rayleigh scattering signals of the first section of transmission optical fiber and the backward Rayleigh scattering signals of the second section of transmission optical fiber are returned to the measurement arm port of the optical fiber interferometer, coherent signals output by an optical fiber interferometer enter a demodulation module through a sampling module, or a detection optical signal enters a first section of transmission optical fiber through a first optical circulator 2 port, is output from a first optical circulator 3 port, enters a downlink far pump amplification unit, the downlink far pump amplification unit performs power amplification on the detection optical signal, enters a second optical circulator 1 port, is output from a second optical circulator 2 port, enters a second section of transmission optical fiber, backward Rayleigh scattering signals generated by the second section of transmission optical fiber enter the second optical circulator 2 port, are output from the second optical circulator 3 port, enter an uplink far pump amplification unit, the uplink far pump amplification unit performs power amplification on the detection optical signal, enters the first optical circulator 1 port, is output from the first optical circulator 2 port, and is transmitted back to the first section of transmission optical fiber.
The remote pump light source in the shore-based equipment is connected with the remote pump amplifier through the remote pump transmission optical fiber to provide pumping energy for the remote pump amplifier.
In this example, the remote pump light source is a 1480nm pump laser, the detection light source is a 1550nm narrow linewidth laser with linewidth of 100Hz, and the sampling module is a dual-channel data acquisition card with sampling rate of 1 GHz/s.
The unrepeatered undersea optical fiber cable disturbance monitoring system in this example can be placed at both ends of the undersea optical fiber cable so that the monitoring distance can reach 400 Km.
The pump light required by the far pump amplifier in this example is injected into a Wavelength Division Multiplexer (WDM) via a 1 x 2 coupler (or two-way far pump transmission fiber).
Claims (4)
1. A non-relay submarine optical cable disturbance monitoring system based on a remote pump amplifier is characterized by comprising shore-based equipment and an underwater remote pump amplifier, wherein the shore-based equipment is provided with a remote pump light source, a detection light source and an optical fiber interferometer which are interconnected, the optical fiber interferometer is sequentially connected with a sampling module and a demodulation module, and an optical fiber reflector is arranged inside the optical fiber interferometer; the underwater remote pump amplifier is provided with a 1 × 2 coupler, a first optical circulator, a first wavelength division multiplexer WDM1, a first erbium-doped fiber EDF1, a second optical circulator, a second wavelength division multiplexer WDM2 and a second erbium-doped fiber EDF2 which are sequentially connected to form a closed loop, wherein a 2 port of the first optical circulator is connected with an optical fiber interferometer through a first section of transmission fiber, the first wavelength division multiplexer WDM1 and the second wavelength division multiplexer WDM2 are respectively connected with the 1 × 2 coupler, the 1 × 2 coupler is connected with a remote pump light source in shore-based equipment through a remote pump transmission fiber, wherein the remote pump light source, the 1 × 2 coupler, the first wavelength division multiplexer WDM1 and the first erbium-doped fiber EDF1 form a downlink remote pump amplification unit, the remote pump light source, the 1 × 2 coupler, the second wavelength division multiplexer WDM2 and the second erbium-doped fiber EDF2 form an uplink remote pump amplification unit, and a 2 output port of the second optical circulator is connected with a second section of transmission fiber, the first section of transmission optical fiber and the second section of transmission optical fiber are any same optical fiber in the unrepeatered submarine optical cable but can not be the same optical fiber with the far pump transmission optical fiber, and the first section of transmission optical fiber and the second section of transmission optical fiber are used for detecting the disturbance monitoring of the long-distance transmission of optical signals.
2. The unrepeatered submarine optical cable disturbance monitoring system according to claim 1, wherein the first and second optical circulators each have three ports, and wherein a 1-port incoming optical signal is output by 2 ports and a 2-port incoming optical signal is output by 3 ports.
3. The unrepeatered submarine optical cable disturbance monitoring system according to claim 1, wherein the maximum value of the sum of the lengths of the first section of transmission fiber and the second section of transmission fiber is 200km, which can meet the single-ended disturbance monitoring requirement of the submarine optical cable within 200 km.
4. The transremote pump amplifier based unrepeatered undersea optical fiber cable disturbance monitoring system of claim 1, wherein the remote pump transmission fiber is any one of the unrepeatered undersea optical fiber cables.
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| CN202210090377.5A CN114448498A (en) | 2022-01-26 | 2022-01-26 | Relay-free submarine optical cable disturbance monitoring system based on remote pump amplifier |
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| CN213602175U (en) * | 2020-12-08 | 2021-07-02 | 湖北工业大学 | Low-noise low-gain clamped bidirectional erbium-doped optical fiber amplifier |
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2022
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