CN110784264A - Long-distance network transmission system and transmission method for submarine observation network - Google Patents
Long-distance network transmission system and transmission method for submarine observation network Download PDFInfo
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- CN110784264A CN110784264A CN201911105248.3A CN201911105248A CN110784264A CN 110784264 A CN110784264 A CN 110784264A CN 201911105248 A CN201911105248 A CN 201911105248A CN 110784264 A CN110784264 A CN 110784264A
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Abstract
The invention particularly relates to a long-distance network transmission system and a long-distance network transmission method for a submarine observation network, and belongs to the technical field of submarine optical cable communication. The system comprises a first node module, a submarine optical cable and a second node module which are connected in sequence; the first node module comprises a first optical fiber mode converter, a first dense wavelength division multiplexer, a second dense wavelength division multiplexer, a first optical fiber amplifier, a first Raman amplifier, a second optical fiber amplifier and a first sparse wavelength division multiplexer; the second node module comprises a second optical fiber mode converter, a third dense wavelength division multiplexer, a fourth dense wavelength division multiplexer, a third optical fiber amplifier, a second Raman amplifier, a fourth optical fiber amplifier and a second sparse wavelength division multiplexer. The method utilizes the wavelength division multiplexing technology to synthesize a plurality of paths of optical signals with different wavelengths into one path of optical signal for amplification processing, performs wavelength division demultiplexing at a receiving end, restores data, realizes ultra-long distance transmission, completely transmits the signal in a transparent way, and ensures ten-gigabit transmission bandwidth.
Description
Technical Field
The invention particularly relates to a long-distance network transmission system and a long-distance network transmission method for a submarine observation network, and belongs to the technical field of submarine optical cable communication.
Background
At present, an optical cable system laid under water is used from a shore end to an underwater node in an undersea observation network system, because the undersea observation range is large, the distance of laying the optical cable is very long, generally speaking, the distance between the nodes is about 100-300KM, and according to the normal attenuation of an optical signal in the optical cable, the system usually needs to have a relay, that is, in the conventional undersea observation network system, the signal intensity is increased by using one or more relays along the length of the optical fiber system to compensate the attenuation in the optical fiber. Repeaters such as CN201510975241, published by beacon communications technologies, inc., generally use a device in the form of a hermetically sealed closed box containing an amplifier for increasing signal strength and an equalizer for correcting signal distortion. Such repeaters are typically spaced along the undersea optical fiber cable to enable the use of longer cables. However, these repeaters are not only expensive, but also require a power source that typically utilizes submarine cables to transmit power, thereby increasing the complexity of the fiber optic system. Meanwhile, the expensive repeater is limited in transmission bandwidth and cannot meet the network bandwidth requirement of more than ten million.
Disclosure of Invention
The invention aims to provide a long-distance network transmission system and a long-distance network transmission method for a submarine observation network, which can realize data interaction of ten-gigabit Ethernet signals through a single optical fiber, the transmission distance of any two adjacent submarine observation nodes is self-adaptive from 0 to 300KM, and the data interaction is realized through the single optical fiber.
In order to achieve the purpose, the invention adopts the following technical scheme:
a long-distance network transmission system for a submarine observation network comprises a first node module, a submarine optical cable and a second node module which are sequentially connected; the first node module comprises a first optical fiber mode converter, a first dense wavelength division multiplexer, a second dense wavelength division multiplexer, a first optical fiber amplifier, a first Raman amplifier, a second optical fiber amplifier and a first sparse wavelength division multiplexer; the output end of the first optical fiber mode converter is connected with the input end of the first dense wavelength division multiplexer; the output end of the first dense wavelength division multiplexer is connected with the input end of the first optical fiber amplifier; the output end of the first optical fiber amplifier is connected with the input end of the first sparse wavelength division multiplexer; the output end of the first sparse wavelength division multiplexer is connected with the input end of the first Raman amplifier; the output end of the first Raman amplifier is connected with the input end of the second optical fiber amplifier; the output end of the second optical fiber amplifier is connected with the input end of the second dense wavelength division multiplexer; the output end of the second dense wavelength division multiplexer is connected with the input end of the first optical fiber mode converter; the second node module comprises a second optical fiber mode converter, a third dense wavelength division multiplexer, a fourth dense wavelength division multiplexer, a third optical fiber amplifier, a second Raman amplifier, a fourth optical fiber amplifier and a second sparse wavelength division multiplexer; the output end of the second optical fiber mode converter is connected with the input end of the third dense wavelength division multiplexer; the output end of the third dense wavelength division multiplexer is connected with the input end of a third optical fiber amplifier; the output end of the third optical fiber amplifier is connected with the input end of the second sparse wavelength division multiplexer; the output end of the second sparse wavelength division multiplexer is connected with the input end of the second Raman amplifier; the output end of the second Raman amplifier is connected with the input end of the fourth optical fiber amplifier; the output end of the fourth optical fiber amplifier is connected with the input end of the fourth dense wavelength division multiplexer; the output end of the fourth dense wavelength division multiplexer is connected with the input end of the second optical fiber mode converter; the first sparse wavelength division multiplexer is connected with the second sparse wavelength division multiplexer through the submarine optical cable.
Further, as a preferred technical solution of the present invention, the first dense wavelength division multiplexer and the fourth dense wavelength division multiplexer both adopt 1550nm dense wavelength division multiplexers.
Further, as a preferred technical solution of the present invention, the second dense wavelength division multiplexer and the third dense wavelength division multiplexer both adopt 1530nm dense wavelength division multiplexers.
Further, as a preferred technical solution of the present invention, the first to fourth optical fiber amplifiers all use erbium-doped optical fiber amplifiers.
Further, as a preferable technical scheme of the present invention, the first sparse wavelength division multiplexer and the second sparse wavelength division multiplexer both adopt 1550nm/1530nm sparse wavelength division multiplexers.
Further, as a preferred technical solution of the present invention, the submarine optical cable has a length of 0 to 300 km.
The transmission method for the long-distance network transmission system of the submarine observation network comprises the following steps that 1, downlink multi-channel optical signals are input into a first optical fiber mode converter, and multi-channel dense optical signals with different wavelengths are output to a first dense wavelength division multiplexer through optical fiber mode conversion; step 2, the first dense wavelength division multiplexer synthesizes a plurality of dense optical signals with different wavelengths into one optical signal and outputs the synthesized optical signal to a first optical fiber amplifier; step 3, the first optical fiber amplifier amplifies the optical signal and outputs the amplified optical signal to the first sparse wavelength division multiplexer; step 4, the first sparse wavelength division multiplexer outputs the optical signals to the second sparse wavelength division multiplexer through the submarine optical cable after performing sparse wavelength division multiplexing on the optical signals; step 5, the second sparse wavelength division multiplexer outputs the optical signal to a second Raman amplifier for amplification, and the second Raman amplifier outputs the amplified optical signal to a fourth optical fiber amplifier; step 6, the fourth optical fiber amplifier amplifies the optical signal and outputs the amplified optical signal to a fourth dense wavelength division multiplexer; step 7, the fourth dense wavelength division multiplexer divides the optical signal into multiple dense optical signals with different wavelengths and outputs the multiple dense optical signals with different wavelengths to the second optical fiber mode converter; and 8, converting the multiple paths of dense optical signals with different wavelengths into multiple paths of optical signals by the second optical fiber mode converter for outputting.
Based on the transmission method for the submarine observation network long-distance network transmission system, uplink multipath optical signals are input into the second optical fiber mode converter, and the first optical fiber mode converter converts multipath intensive optical signals with different wavelengths into multipath optical signals for output by repeating the steps 1 to 8.
Based on the transmission method for the submarine observation network long-distance network transmission system, the optical wavelength selected by the uplink multi-path optical signal and the downlink multi-path optical signal is on the C waveband.
Compared with the prior art, the invention adopting the technical scheme has the following technical effects:
(1) a plurality of optical signals with different wavelengths are synthesized into one optical signal by using a wavelength division multiplexing technology to be amplified. The ultra-long distance transmission is realized, the wavelength division multiplexing is carried out at the receiving end, the data is restored, the signals are completely transmitted in a transparent mode in the whole processing process, the signal distortion is small, the degradation is small, and the ten-gigabit transmission bandwidth is guaranteed.
(2) The selected optical wavelength is concentrated in a C wave band, the loss of the C wave band per kilometer is minimum when the optical fiber is transmitted in an ultra-long distance, and uplink and downlink optical signals after DWDM and optical fiber amplification can be multiplexed to an optical fiber through a CWDM wavelength division multiplexer.
(3) The power of a single-node designed power supply of the submarine observation network reaches 10KW, the medium-voltage 400V and low-voltage output of each level are met, and the system can be completely supported to supply power, so that the submarine observation network optical cable does not need to be changed.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1, a long-distance network transmission system for a submarine observation network includes a node a module, a submarine optical cable, and a node B module, which are connected in sequence; the node A module comprises a first optical fiber mode converter, a first dense wavelength division multiplexer, a second dense wavelength division multiplexer, a first optical fiber amplifier, a first Raman amplifier, a second optical fiber amplifier and a first sparse wavelength division multiplexer; the output end of the first optical fiber mode converter is connected with the input end of the first dense wavelength division multiplexer; the output end of the first dense wavelength division multiplexer is connected with the input end of the first optical fiber amplifier; the output end of the first optical fiber amplifier is connected with the input end of the first sparse wavelength division multiplexer; the output end of the first sparse wavelength division multiplexer is connected with the input end of the first Raman amplifier; the output end of the first Raman amplifier is connected with the input end of the second optical fiber amplifier; the output end of the second optical fiber amplifier is connected with the input end of the second dense wavelength division multiplexer; the output end of the second dense wavelength division multiplexer is connected with the input end of the first optical fiber mode converter; the node B module comprises a second optical fiber mode converter, a third dense wavelength division multiplexer, a fourth dense wavelength division multiplexer, a third optical fiber amplifier, a second Raman amplifier, a fourth optical fiber amplifier and a second sparse wavelength division multiplexer; the output end of the second optical fiber mode converter is connected with the input end of the third dense wavelength division multiplexer; the output end of the third dense wavelength division multiplexer is connected with the input end of the third optical fiber amplifier; the output end of the third optical fiber amplifier is connected with the input end of the second sparse wavelength division multiplexer; the output end of the second sparse wavelength division multiplexer is connected with the input end of the second Raman amplifier; the output end of the second Raman amplifier is connected with the input end of the fourth optical fiber amplifier; the output end of the fourth optical fiber amplifier is connected with the input end of the fourth dense wavelength division multiplexer; the output end of the fourth dense wavelength division multiplexer is connected with the input end of the second optical fiber mode converter; the first sparse wavelength division multiplexer is connected with the second sparse wavelength division multiplexer through the submarine optical cable.
The first dense wavelength division multiplexer and the fourth dense wavelength division multiplexer are 1550nm dense wavelength division multiplexers. The second dense wavelength division multiplexer and the third dense wavelength division multiplexer are 1530nm dense wavelength division multiplexers. The first optical fiber amplifier to the fourth optical fiber amplifier all adopt erbium-doped optical fiber amplifiers. The first sparse wavelength division multiplexer and the second sparse wavelength division multiplexer are both 1550nm/1530nm sparse wavelength division multiplexers. The submarine optical cable has a length of 0 to 300 km.
The transmission method for the long-distance network transmission system of the submarine observation network comprises the following steps that 1, downlink multi-channel optical signals are input into a first optical fiber mode converter, and multi-channel dense optical signals with different wavelengths are output to a first dense wavelength division multiplexer through optical fiber mode conversion; step 2, the first dense wavelength division multiplexer synthesizes a plurality of dense optical signals with different wavelengths into one optical signal and outputs the synthesized optical signal to a first optical fiber amplifier; step 3, the first optical fiber amplifier amplifies the optical signal and outputs the amplified optical signal to the first sparse wavelength division multiplexer; step 4, the first sparse wavelength division multiplexer outputs the optical signals to the second sparse wavelength division multiplexer through the submarine optical cable after performing sparse wavelength division multiplexing on the optical signals; step 5, the second sparse wavelength division multiplexer outputs the optical signal to a second Raman amplifier for amplification, and the second Raman amplifier outputs the amplified optical signal to a fourth optical fiber amplifier; step 6, the fourth optical fiber amplifier amplifies the optical signal and outputs the amplified optical signal to a fourth dense wavelength division multiplexer; step 7, the fourth dense wavelength division multiplexer divides the optical signal into multiple dense optical signals with different wavelengths and outputs the multiple dense optical signals with different wavelengths to the second optical fiber mode converter; and 8, converting the multiple paths of dense optical signals with different wavelengths into multiple paths of optical signals by the second optical fiber mode converter for outputting.
The transmission method for the submarine observation network long-distance network transmission system is characterized in that uplink multipath optical signals are input into the second optical fiber mode converter, and the first optical fiber mode converter converts multipath intensive optical signals with different wavelengths into multipath optical signals for output by repeating the steps 1 to 8. The optical wavelength selected by the uplink multi-path optical signal and the downlink multi-path optical signal is on the C wave band.
When the node A works specifically, two wavelength division multiplexing technologies of sparse wavelength division multiplexing (CWDM) and Dense Wavelength Division Multiplexing (DWDM) are utilized in the node A module, an optical fiber amplification technology is combined, light signals are converted into optical signals with different wavelengths after being processed, then one path of optical signals are synthesized through the wavelength division multiplexer and are amplified, and ultra-long distance transmission of data is achieved. And after the optical signals are subjected to secondary amplification in the node B module, the optical signals with different wavelengths are recovered by wavelength division multiplexing, and the original data is recovered after time division multiplexing processing of the optical signals.
The externally input 4 paths of 2.5Gbps optical signals are converted into DWDM optical signals with different wavelengths through optical fiber mode conversion, and the total 4 paths of downlink (from a node A module to a node B module, and the wavelengths of C30, C32, C34 and C36 are selected) and 4 paths of uplink (from the node B module to the node A module, and the wavelengths of C54, C56, C58 and C60 are selected) are provided. In order to realize single-fiber bidirectional transmission of 8-path optical signals, wavelength division multiplexing and optical fiber amplification processing are required to be carried out on the optical signals, the loss of the 300km optical fiber is large, the attenuation requirement of the whole optical link cannot be met by one-stage amplification, and therefore two-stage optical amplification is required to be carried out at a receiving end. The unidirectionality of the optical fiber amplifier causes that the wavelength division multiplexer also needs to carry out two-stage multiplexing and is combined on one optical fiber, thereby realizing the long-distance single-fiber bidirectional transmission of all data.
The wavelength of 4 downlink optical signals selects DWDM optical wavelength near 1550nm, the optical power of the 4 downlink optical signals is amplified to 20dBm by a 1550nm/DWMD wavelength division multiplexer, the signals are multiplexed to an optical fiber by a CWDM wavelength division multiplexer (2dB attenuation), the signals are attenuated by 54dB after passing through a 300Km optical fiber (attenuation 0.18/Km) until the optical power of B is less than-36 dBm, in order to increase the reliability of the system and the dynamic range of the whole optical link, a Raman amplifier FRA and a prepositive erbium-doped optical fiber amplifier (pre-amplification PA) are used at a receiving end to enable the optical power entering the 1550nm/DWDM wavelength division multiplexer to be about-10 dBm, and then the optical power of the 4 optical signals with different wavelengths is enabled to be at-13 dBm by the 1550nm/DWDM wavelength division multiplexer, therefore, the optical power is ensured to be within the receiving sensitivity range of the node module and not to exceed the saturated optical power of the node module.
The 4 optical signals in the uplink are DWDM optical wavelengths near 1530nm, and the processing mode is the same as that of the optical signals in the downlink, and the description is omitted here. Because the use of the existing optical fiber amplifier is mainly concentrated on the C wave band, the loss per kilometer of the C wave band is minimum when the optical fiber amplifier is used for ultra-long distance transmission, all uplink and downlink optical signals adopt the wavelengths of 1550nm and 1530nm, and the uplink and downlink optical signals after DWDM and optical fiber amplification can be multiplexed to an optical fiber by a CWDM wavelength division multiplexer. In an ultra-long distance transmission system, the factors that affect the transmission distance include two aspects: power penalty and dispersion penalty. Because the speed of optical signals in the system does not exceed 2.5Gbps, the transmission distance does not exceed 300km, the dispersion influence is not great, and the dispersion band price can be not considered. The power loss cost of the system is mainly concerned in the design of the optical link, the transmitted optical power is 20dBm, the receiving sensitivity of a receiving end can reach-41 dBm, the allowable loss of the link is 61dB, 54dB is attenuated by 300Km optical fibers (attenuation is 0.18/Km), 2dB is attenuated by primary CWDM wavelength division multiplexing, 5dB optical link loss allowance is reserved in the system, and the normal communication of the whole system under the condition of 300Km can be ensured. The system uses the submarine observation network node power supply to supply power, and does not need to reform a submarine optical cable and add an optical repeater.
The above-mentioned embodiments, objects, technical solutions and advantages of the present invention are further described in detail, it should be understood that the above-mentioned embodiments are only illustrative of the present invention, and are not intended to limit the scope of the present invention, and any person skilled in the art should understand that equivalent changes and modifications made without departing from the concept and principle of the present invention should fall within the protection scope of the present invention.
Claims (9)
1. A long-distance network transmission system for a submarine observation network is characterized in that: the system comprises a first node module, a submarine optical cable and a second node module which are connected in sequence;
the first node module comprises a first optical fiber mode converter, a first dense wavelength division multiplexer, a second dense wavelength division multiplexer, a first optical fiber amplifier, a first Raman amplifier, a second optical fiber amplifier and a first sparse wavelength division multiplexer; the output end of the first optical fiber mode converter is connected with the input end of the first dense wavelength division multiplexer; the output end of the first dense wavelength division multiplexer is connected with the input end of the first optical fiber amplifier; the output end of the first optical fiber amplifier is connected with the input end of the first sparse wavelength division multiplexer; the output end of the first sparse wavelength division multiplexer is connected with the input end of the first Raman amplifier; the output end of the first Raman amplifier is connected with the input end of the second optical fiber amplifier; the output end of the second optical fiber amplifier is connected with the input end of the second dense wavelength division multiplexer; the output end of the second dense wavelength division multiplexer is connected with the input end of the first optical fiber mode converter;
the second node module comprises a second optical fiber mode converter, a third dense wavelength division multiplexer, a fourth dense wavelength division multiplexer, a third optical fiber amplifier, a second Raman amplifier, a fourth optical fiber amplifier and a second sparse wavelength division multiplexer; the output end of the second optical fiber mode converter is connected with the input end of the third dense wavelength division multiplexer; the output end of the third dense wavelength division multiplexer is connected with the input end of a third optical fiber amplifier; the output end of the third optical fiber amplifier is connected with the input end of the second sparse wavelength division multiplexer; the output end of the second sparse wavelength division multiplexer is connected with the input end of the second Raman amplifier; the output end of the second Raman amplifier is connected with the input end of the fourth optical fiber amplifier; the output end of the fourth optical fiber amplifier is connected with the input end of the fourth dense wavelength division multiplexer; the output end of the fourth dense wavelength division multiplexer is connected with the input end of the second optical fiber mode converter;
the first sparse wavelength division multiplexer is connected with the second sparse wavelength division multiplexer through the submarine optical cable.
2. The long-distance network transmission system for the undersea observation network according to claim 1, wherein: the first dense wavelength division multiplexer and the fourth dense wavelength division multiplexer are 1550nm dense wavelength division multiplexers.
3. The long-distance network transmission system for the undersea observation network according to claim 1, wherein: and the second dense wavelength division multiplexer and the third dense wavelength division multiplexer are respectively a 1530nm dense wavelength division multiplexer.
4. The long-distance network transmission system for the undersea observation network according to claim 1, wherein: and the first optical fiber amplifier to the fourth optical fiber amplifier adopt erbium-doped optical fiber amplifiers.
5. The long-distance network transmission system for the undersea observation network according to claim 1, wherein: the first sparse wavelength division multiplexer and the second sparse wavelength division multiplexer are both 1550nm/1530nm sparse wavelength division multiplexers.
6. The long-distance network transmission system for the undersea observation network according to claim 1, wherein: the submarine optical cable has a length of 0 to 300 kilometers.
7. The transmission method for the long-distance network transmission system of the undersea observation network according to claim 1, wherein: comprises the following steps of (a) carrying out,
step 1, inputting downlink multi-channel optical signals into a first optical fiber mode converter, and outputting multi-channel dense optical signals with different wavelengths to a first dense wavelength division multiplexer through optical fiber mode conversion;
step 2, the first dense wavelength division multiplexer synthesizes a plurality of dense optical signals with different wavelengths into one optical signal and outputs the synthesized optical signal to a first optical fiber amplifier;
step 3, the first optical fiber amplifier amplifies the optical signal and outputs the amplified optical signal to the first sparse wavelength division multiplexer;
step 4, the first sparse wavelength division multiplexer outputs the optical signals to the second sparse wavelength division multiplexer through the submarine optical cable after performing sparse wavelength division multiplexing on the optical signals;
step 5, the second sparse wavelength division multiplexer outputs the optical signal to a second Raman amplifier for amplification, and the second Raman amplifier outputs the amplified optical signal to a fourth optical fiber amplifier;
step 6, the fourth optical fiber amplifier amplifies the optical signal and outputs the amplified optical signal to a fourth dense wavelength division multiplexer;
step 7, the fourth dense wavelength division multiplexer divides the optical signal into multiple dense optical signals with different wavelengths and outputs the multiple dense optical signals with different wavelengths to the second optical fiber mode converter;
and 8, converting the multiple paths of dense optical signals with different wavelengths into multiple paths of optical signals by the second optical fiber mode converter for outputting.
8. The transmission method for the seafloor observatory network long-distance network transmission system of claim 7, wherein: and inputting the uplink multi-path optical signals into a second optical fiber mode converter, and converting the multi-path intensive optical signals with different wavelengths into multi-path optical signals by the first optical fiber mode converter through repeating the steps 1 to 8.
9. The transmission method for the seafloor observatory network long-distance network transmission system of claim 8, wherein: the optical wavelength selected by the uplink multi-path optical signal and the downlink multi-path optical signal is on the C wave band.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117439696A (en) * | 2023-12-19 | 2024-01-23 | 华海通信技术有限公司 | Optical path communication structure applied to submarine observation network communication equipment |
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| US20130094806A1 (en) * | 2011-10-12 | 2013-04-18 | Telefonaktiebolaget L M Ericsson (Publ) | Optical signal conversion method and apparatus |
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| CN117439696A (en) * | 2023-12-19 | 2024-01-23 | 华海通信技术有限公司 | Optical path communication structure applied to submarine observation network communication equipment |
| CN117439696B (en) * | 2023-12-19 | 2024-02-27 | 华海通信技术有限公司 | Optical path communication structure applied to submarine observation network communication equipment |
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