CN111200462A - Multi-core single-mode optical fiber signal transmission device based on shared pumping - Google Patents
Multi-core single-mode optical fiber signal transmission device based on shared pumping Download PDFInfo
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- CN111200462A CN111200462A CN202010016774.9A CN202010016774A CN111200462A CN 111200462 A CN111200462 A CN 111200462A CN 202010016774 A CN202010016774 A CN 202010016774A CN 111200462 A CN111200462 A CN 111200462A
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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
- H04B10/2581—Multimode transmission
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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
Abstract
The invention provides a multi-core single-mode optical fiber signal transmission device based on a shared pump, which comprises a multi-core transmission module and a pump module. The multi-core transmission module consists of a light stopper, a fan-in unit, a multi-core optical fiber and a fan-out unit, wherein multiple paths of input signals are injected into the multi-core transmission module in the forward direction and transmitted opposite to pump light injected in the reverse direction, and the signal transmission loss is compensated through a Raman amplification effect; the pumping module comprises a first pumping laser, a second pumping laser and a polarization beam combiner, and forms circular polarization Raman pumping light in a 14XXnm wave band, so that the polarization dependence effect in the Raman amplification process is reduced. Compared with the existing single-core single-mode transmission system, the multi-channel single-mode parallel transmission system simultaneously provides multi-channel single-mode parallel transmission capability in a single optical fiber, greatly improves the system transmission capacity of the single optical fiber, simultaneously provides Raman amplification gain for multi-channel transmission signals through a shared pumping technology, improves the pumping use efficiency and reduces the complexity of the transmission system.
Description
Technical Field
The invention relates to the field of optical fiber communication networks, in particular to a multi-core single-mode optical fiber signal transmission device based on a shared pump.
Background
With the great rise of high-bandwidth applications such as high-definition video, large-scale online games, network live broadcast and the like, a single-mode optical fiber communication network approaches the limit of system capacity. At present, the main methods for improving the system rate are methods of high-spectrum-efficiency modulation format, unprotected interval wavelength division multiplexing, polarization multiplexing and the like, and such schemes can fully utilize bandwidth resources of the existing optical fiber channel to the maximum extent, but still only carry out optimization aiming at a single-mode communication system. In order to break through the communication limit of the system capacity in a single optical fiber, a space division multiplexing parallel signal transmission mode becomes a research hotspot. Currently, there are two main types of space division multiplexing transmission methods: few-mode fiber transmission and multi-core fiber transmission. The former simultaneously supports the common transmission of a plurality of mode signals in a single fiber core, and can improve the system speed by times, but the scheme introduces extremely strong intermode noise interference, the strong coupling relation among the modes greatly degrades the communication quality, a complex digital signal processing technology (DSP) is needed to realize signal demodulation, and the receiving difficulty is increased. The single optical fiber is provided with a plurality of single-mode fiber cores, and the aim of parallel transmission of multiple signals is fulfilled under the support of fan-in/fan-out equipment. Because enough isolation distance is kept between the single-mode fiber cores, crosstalk between the cores is avoided, and a space division multiplexing communication mode can be supported without adopting an additional DSP demodulation algorithm, so that the system has a strong system application prospect. Providing power compensation for a multi-core single-mode communication system is a core requirement for supporting long-distance transmission of the multi-core single-mode communication system, and currently, a single-core independent amplification mode is mainly adopted for compensating transmission loss. Although the method has the technical advantage that a single core is flexible and controllable, the quantity of required pump laser is greatly increased along with the increase of the quantity of the fiber core, so that the size and the energy consumption of the communication relay node are increased, and the system transmission and maintenance are not facilitated.
Disclosure of Invention
Aiming at the defects in the prior art, the multi-core single-mode optical fiber signal transmission device based on the shared pumping breaks through the problem that the capacity of the traditional single-mode communication system is limited, simultaneously provides a Raman amplification function for multi-core single-mode transmission signals by utilizing the shared pumping technology, solves the problems of large volume and high system energy consumption of an independent pumping scheme, and improves the pumping efficiency.
In order to achieve the above purpose, the invention adopts the technical scheme that:
the scheme provides a multi-core single-mode optical fiber signal transmission device based on a shared pump, which comprises a multi-core transmission module and a pump module coupled with the multi-core transmission module;
the multi-core transmission module is used for receiving multi-channel input signals injected in the forward direction, transmitting the multi-channel signals and pump light injected in the reverse direction in the opposite direction, and compensating transmission loss of the signals through a Raman amplification effect to obtain multi-channel output signals, wherein the power of the multi-channel output signals subjected to power compensation and obtained at the output end of the multi-core transmission module is consistent with the power of the input signals;
the pumping module is used for providing high-power continuous pumping light for the reverse Raman amplification.
Furthermore, the multi-core transmission module comprises a fan-in unit, a multi-core fiber coupled with the fan-in unit, a fan-out unit connected with the multi-core fiber, and a light stopper connected with the fan-in unit, wherein the fan-out unit is coupled with the pumping module.
Furthermore, the fan-in unit is used for receiving multiple input signals and coupling the received signals into the multi-core optical fiber;
the multi-core optical fiber is used for carrying out Raman amplification effect processing on the received multi-channel signals, compensating signal transmission loss in the transmission process of the multi-channel signals and the reversely injected pump light in the opposite direction, and carrying out long-distance optical transmission on the multi-channel signals subjected to loss compensation to the fan-out unit;
the fan-out unit is used for separating each path of signals in optical fiber transmission to obtain output signals and providing input ends for injecting reverse pump light, and the number of the output paths is matched with that of the input signals;
the light stopper is used for absorbing residual energy of the backward transmission pump light.
Furthermore, the input end of the fan-in unit is a single mode fiber, and the output end of the fan-in unit is connected with the multi-core fiber.
Still further, the number of channels of the single-mode fiber is N +1, where:
the N paths are used for receiving multiple paths of input signals and are matched with the number of the input signals;
the remaining 1 channel is used for coupling out the backward pump light.
Still further, the multicore fiber includes N single-mode cores and a multimode core, wherein:
the number N of the single-mode fiber cores is matched with the number of paths of input signals, the single-mode fiber cores are uniformly distributed around the multi-mode fiber cores in an annular mode, and the multi-mode fiber cores are located in the center of the multi-core optical fiber.
Still further, the pump module includes a polarization beam combiner coupled with the fan-out unit, and a first pump laser and a second pump laser respectively coupled with the polarization beam combiner.
Still further, the first pump laser and the second pump laser are both used for providing continuous pump light with the same wavelength and located in a 14XXnm wave band;
the polarization beam combiner is used for coupling the pump light generated by the first pump laser and the second pump laser together to form high-power pump light with circular polarization characteristics, so that high-power continuous pump light is provided for reverse Raman amplification, and uniform power gain is provided for signal light in different polarization states.
The invention has the beneficial effects that:
(1) although various multiplexing techniques can be used in a conventional single-mode fiber communication system to increase the system transmission rate to a certain extent, the conventional single-mode fiber communication system cannot provide a higher system rate. The existing multi-core single-mode transmission system adopts an independent pumping amplification mode to compensate transmission loss, has high system complexity and signal processing energy consumption, and does not accord with the development trend of low-energy-consumption optical networks. The invention provides a novel multi-core single-mode optical fiber transmission device sharing a pump, which can not only improve the system speed of a single optical fiber in multiples, but also improve the pumping efficiency through a pumping sharing technology and reduce the signal processing cost;
(2) the invention combines the Raman amplification technology and the multi-core optical fiber transmission system, and provides a novel optical transmission mode in the space division multiplexing network, compared with the traditional independent pumping power compensation technology, the novel technology simultaneously provides an amplification function for multi-channel parallel transmission signals by using single pumping light, thereby greatly reducing the energy consumption of the system; in addition, a multimode fiber core is provided at the central position of the multi-core fiber, and is used for low insertion loss and high stimulated Brillouin threshold injection of high-power continuous pumping light. Therefore, the multi-core single-mode optical fiber signal transmission device provided by the invention has the technical advantages of high system communication rate and low signal processing cost, and provides a system transmission solution for a future high-capacity high-speed optical transmission network.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Fig. 2 is a schematic cross-sectional view of a multi-core optical fiber of the present invention.
Fig. 3 is a schematic diagram comparing signal power distribution in the transmission apparatus of the present invention with that in the conventional transmission apparatus.
Fig. 4 is a diagram illustrating comparison between signal transmission quality in the present invention and that in a conventional apparatus.
Detailed Description
The following description of the embodiments of the present invention is provided to facilitate the understanding of the present invention by those skilled in the art, but it should be understood that the present invention is not limited to the scope of the embodiments, and it will be apparent to those skilled in the art that various changes may be made without departing from the spirit and scope of the invention as defined and defined in the appended claims, and all matters produced by the invention using the inventive concept are protected.
Examples
The invention provides a multi-core single-mode optical fiber signal transmission device based on a shared pump, as shown in fig. 1, a multi-core transmission module is used for receiving multi-channel input signals injected in a forward direction, transmitting the multi-channel signals and pump light injected in a reverse direction in a directional manner, and compensating transmission loss of the signals through a Raman amplification effect to obtain multi-channel output signals, wherein the power of the multi-channel output signals subjected to power compensation and obtained at the output end of the multi-core transmission module is consistent with the power of the input signals; the pumping module is used for providing high-power continuous pumping light for the reverse Raman amplification.
In this embodiment, multiple input signals are respectively injected into the multi-core transmission module in the forward direction, and long-distance optical transmission is performed in the multi-core fiber, and the optical power attenuation caused by transmission loss is compensated by the raman amplification effect of the single pump light injected by the backward coupling. The continuous and high-power pump light with the wave band of 14XXnm generated by the pump module has circular polarization characteristics, can provide Raman gain for signal light with different polarization states, and reduces the polarization dependence effect in the amplification process. And obtaining a plurality of paths of output signals subjected to power compensation at the output end of the multi-core transmission module, wherein the power of the output signals is consistent with that of the input signals.
In this embodiment, the multi-core transmission module includes four parts, namely, a light stopper, a fan-in unit, a multi-core fiber, and a fan-out unit. The multi-channel input signals are coupled into the multi-core optical fiber through the fan-in unit, the input end of the fan-in unit is a single-mode optical fiber, the number of channels of the fan-in unit is N +1, wherein the N channels correspond to the number of input signal channels, the more channels are used for coupling and outputting reverse pump light, and the characteristics of the output end optical fiber of the fan-in unit are the same as those of the multi-core optical fiber. The multi-core optical fiber comprises N +1 fiber cores, wherein the number N of the single-mode fiber cores is consistent with the number of input signal paths, and the single-mode fiber cores are uniformly distributed around the single multi-mode fiber core according to the annular distribution characteristic; the multimode fiber core is positioned at the central position of the multi-core fiber and provides transmission characteristics of low insertion loss and high stimulated Brillouin threshold value for high-power continuous pumping light. The output end of the multi-core optical fiber is connected with the fan-out unit, separates each path of transmission signals and provides an input end for injecting reverse pump light. The light stopper is used for absorbing residual energy of the pump light transmitted reversely, and the Raman amplification effect is prevented from being influenced by the reflection of the pump light.
In this embodiment, the pumping module includes a first pump laser, a second pump laser, and a polarization beam combiner. The first pump laser and the second pump laser provide continuous pump light with the same wavelength and located in a 14XXnm wave band, and are coupled together through the polarization beam combiner to form high-power pump light with circular polarization characteristics, the pump light can reduce polarization dependence effect in a Raman amplification process, and uniform power gain is provided for signal light in different polarization states.
In this embodiment, the multi-core transmission module provides a large-capacity multi-core optical fiber transmission medium, and compensates for energy loss during signal transmission by using a raman amplification effect of the optical fiber. The multi-path input signals are firstly coupled into the multi-core optical fiber in the forward direction through the fan-in unit for long-distance optical transmission. Each path of signal can fully utilize various multiplexing technologies to achieve the purpose of high-capacity optical transmission, and the cost of the system speed supported by a plurality of single-mode fiber cores of the subsequent multi-core optical fiber is increased. In order to meet the requirement of signal parallel injection, the number N of input signal paths is matched with the number of fan-in units, the number of multi-core optical fiber single-mode fiber cores and the fan-out units, the input ends of the fan-in units are single-mode optical fibers, and the output ends of the fan-in units are consistent with the multi-core optical fibers.
In this embodiment, the multicore fiber includes N +1 fiber cores, where the N single-mode fiber cores are matched with the input N data; there are 1 multimode cores in the central position of the multicore fiber for continuous pump light injection. The multimode fiber core has a larger core diameter, is convenient for high-power pumping light coupling, has a high stimulated Brillouin threshold value, ensures effective pumping light power injection, and can provide optical pumping for multi-channel signal amplification. As shown in fig. 2, fig. 2 shows a schematic structural diagram of a 5-core optical fiber, in which a multimode core at the center of the fiber provides pump light transmission, and 4 single-mode cores are uniformly distributed around the multimode core, and a portion of pump light energy is coupled into the single-mode core by using an evanescent field between the multimode core and the single-mode core to provide raman amplification.
In this embodiment, the output end of the multi-core fiber is connected to the fan-out unit, the fan-out unit may separate each signal in the fiber transmission to obtain multiple output signals, and one of the output fibers is connected to the subsequent pump module to realize the reverse injection of the pump light signal, so that it is the reverse pump light raman effect that provides amplification gain for the signal in the multi-core fiber. The pump light is coupled out of the multi-core optical fiber transmission system through the fan-in unit, and the residual energy of the pump light is absorbed by the light stopper, so that the instability of the system performance caused by the reflection of the pump light is avoided. As shown in fig. 3, fig. 3 is a schematic diagram comparing the power distribution of signals in the transmission device of the present invention with that of signals in the conventional transmission device, and the power of the signals at the output end of the optical fiber is gradually restored to the power level at the input end under the action of the raman amplification effect of the backward pump light. This results in lower power jitter of the signal in the link transmission compared to conventional transmission arrangements using Erbium Doped Fibre Amplifiers (EDFAs).
In this embodiment, the pumping module provides high-power continuous pump light for reverse raman amplification, the unit includes a first pump laser, a second pump laser, and a polarization beam combiner, the two pump lasers generate pump light with the same wavelength, the wavelength of the pump light is distributed in a 14XXnm band, and raman gain can be provided for a C-band transmission signal, the polarization of the two pump lights is different, circular polarization pump light is formed under the action of the subsequent polarization beam combiner, uniform amplification gain can be provided for signal lights with different polarization types, and polarization dependence of the raman amplification process is reduced. As shown in fig. 4, fig. 4 is a schematic diagram showing a comparison between the signal transmission quality in the present invention and the signal transmission quality in the conventional apparatus, and it can be seen that in the novel multi-core single-mode fiber signal transmission apparatus, the signal power jitter intensity is reduced and the communication quality is improved due to the reverse raman amplification technology.
Claims (8)
1. A multi-core single-mode fiber signal transmission device based on shared pumping is characterized by comprising a multi-core transmission module and a pumping module coupled with the multi-core transmission module;
the multi-core transmission module is used for receiving multi-channel input signals injected in the forward direction, transmitting the multi-channel signals and pump light injected in the reverse direction in the opposite direction, and compensating transmission loss of the signals through a Raman amplification effect to obtain multi-channel output signals, wherein the power of the multi-channel output signals subjected to power compensation and obtained at the output end of the multi-core transmission module is consistent with the power of the input signals;
the pumping module is used for providing high-power continuous pumping light for the reverse Raman amplification.
2. The shared pump-based multi-core single-mode fiber signal transmission apparatus as claimed in claim 1, wherein the multi-core transmission module comprises a fan-in unit, a multi-core fiber coupled to the fan-in unit, a fan-out unit connected to the multi-core fiber, and a light stopper connected to the fan-in unit, the fan-out unit being coupled to the pump module.
3. The shared pump-based multi-core single-mode fiber signal transmission apparatus as claimed in claim 2, wherein the fan-in unit is configured to receive multiple input signals and couple the received signals into the multi-core fiber;
the multi-core optical fiber is used for carrying out Raman amplification effect processing on the received multi-channel signals, compensating signal transmission loss in the transmission process of the multi-channel signals and the reversely injected pump light in the opposite direction, and carrying out long-distance optical transmission on the multi-channel signals subjected to loss compensation to the fan-out unit;
the fan-out unit is used for separating each path of signals in optical fiber transmission to obtain output signals and providing input ends for injecting reverse pump light, and the number of the output paths is matched with that of the input signals;
the light stopper is used for absorbing residual energy of the backward transmission pump light.
4. The shared pump-based multi-core single-mode fiber signal transmission device as claimed in claim 2, wherein the input end of the fan-in unit is a single-mode fiber, and the output end of the fan-in unit is connected to the multi-core fiber.
5. The shared pump-based multi-core single-mode fiber signal transmission device according to claim 4, wherein the number of channels of the single-mode fiber is N +1, wherein:
the N paths are used for receiving multiple paths of input signals and are matched with the number of the input signals;
the remaining 1 channel is used for coupling out the backward pump light.
6. The shared pump-based multi-core single-mode fiber signal transmission device as claimed in claim 2, wherein the multi-core fiber comprises N single-mode cores and one multi-mode core, wherein:
the number N of the single-mode fiber cores is matched with the number of paths of input signals, the single-mode fiber cores are uniformly distributed around the multi-mode fiber cores in an annular mode, and the multi-mode fiber cores are located in the center of the multi-core optical fiber.
7. The shared pump-based multi-core single-mode fiber signal transmission apparatus according to claim 2, wherein the pump module comprises a polarization beam combiner coupled to the fan-out unit, and a first pump laser and a second pump laser respectively coupled to the polarization beam combiner.
8. The shared pump-based multi-core single-mode fiber signal transmission device according to claim 7, wherein the first pump laser and the second pump laser are both configured to provide co-wavelength continuous pump light in a 14XXnm band;
the polarization beam combiner is used for coupling the pump light generated by the first pump laser and the second pump laser together to form high-power pump light with circular polarization characteristics, so that high-power continuous pump light is provided for reverse Raman amplification, and uniform power gain is provided for signal light in different polarization states.
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| CN114234056A (en) * | 2021-11-30 | 2022-03-25 | 武汉理工大学 | Distributed optical fiber acoustic wave sensing pipeline leakage monitoring system and method |
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| CN114234056A (en) * | 2021-11-30 | 2022-03-25 | 武汉理工大学 | Distributed optical fiber acoustic wave sensing pipeline leakage monitoring system and method |
| CN114234056B (en) * | 2021-11-30 | 2023-11-10 | 武汉理工大学 | Distributed optical fiber acoustic wave sensing pipeline leakage monitoring system and method |
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Application publication date: 20200526 |