CN111682921A - Optical Amplification System for Multiplexed Signals in Orthogonal Mode - Google Patents
Optical Amplification System for Multiplexed Signals in Orthogonal Mode Download PDFInfo
- Publication number
- CN111682921A CN111682921A CN202010800168.6A CN202010800168A CN111682921A CN 111682921 A CN111682921 A CN 111682921A CN 202010800168 A CN202010800168 A CN 202010800168A CN 111682921 A CN111682921 A CN 111682921A
- Authority
- CN
- China
- Prior art keywords
- mode
- optical
- signal
- orthogonal
- optical fiber
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 230000003287 optical effect Effects 0.000 title claims abstract description 36
- 230000003321 amplification Effects 0.000 title claims abstract description 18
- 238000003199 nucleic acid amplification method Methods 0.000 title claims abstract description 18
- 230000005540 biological transmission Effects 0.000 claims abstract description 29
- 238000005086 pumping Methods 0.000 claims abstract description 5
- 239000013307 optical fiber Substances 0.000 claims description 36
- 238000005253 cladding Methods 0.000 claims description 5
- 230000008878 coupling Effects 0.000 abstract description 4
- 238000010168 coupling process Methods 0.000 abstract description 4
- 238000005859 coupling reaction Methods 0.000 abstract description 4
- 239000000835 fiber Substances 0.000 description 12
- 229910052691 Erbium Inorganic materials 0.000 description 8
- -1 erbium ions Chemical class 0.000 description 8
- 230000005281 excited state Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 238000004891 communication Methods 0.000 description 3
- 230000005283 ground state Effects 0.000 description 2
- 230000008054 signal transmission Effects 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 235000015170 shellfish Nutrition 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/04—Mode multiplex systems
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
- H04J2011/0003—Combination with other multiplexing techniques
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Lasers (AREA)
- Optical Communication System (AREA)
Abstract
本发明公开了一种正交模式复用信号的光放大系统，包括正交模式复用信号装置、模式光子灯笼复用器、模式光子灯笼解复用器，还包括正交模式泵浦光系统，输出与正交模式复用信号的模式和相位一致的泵浦光；还包括用于正交模式复用信号光放大的传输链路；正交模式复用信号装置输出端和正交模式泵浦光系统输出端与模式光子灯笼复用器输入端信号连接，模式光子灯笼复用器输出端与传输链路输入端信号连接，传输链路输出端与模式光子灯笼解复用器输入端信号连接。通过对泵浦光的正交模式匹配实现与信号光的耦合传输，对不同模式下的光信号进行放大，从而实现低模间耦合的光信号均衡，为正交模式复用信号长距离传输时提供了稳定的光放大系统。
The invention discloses an optical amplifying system for an orthogonal mode multiplexing signal, including an orthogonal mode multiplexing signal device, a mode photonic lantern multiplexer, a mode photonic lantern demultiplexer, and an orthogonal mode pumping optical system , output the pump light consistent with the mode and phase of the quadrature mode multiplexed signal; it also includes a transmission link for optical amplification of the quadrature mode multiplexed signal; the output end of the quadrature mode multiplexed signal device and the quadrature mode pump The output end of the Pu optical system is connected with the signal of the input end of the mode photonic lantern multiplexer, the output end of the mode photonic lantern multiplexer is connected with the signal of the input end of the transmission link, and the output end of the transmission link is connected with the signal of the input end of the mode photonic lantern demultiplexer. connect. Through the orthogonal mode matching of the pump light, the coupling transmission with the signal light is realized, and the optical signals in different modes are amplified, so as to realize the optical signal equalization of low-mode coupling, which is a long-distance transmission of the orthogonal mode multiplexed signal. Provides a stable optical amplification system.
Description
Technical Field
The invention relates to the field of communication transmission, in particular to an optical amplification system of an orthogonal mode multiplexing signal.
Background
With the rapid development of internet +, big data, cloud computing and 5G, the demand of users on network capacity is increasing day by day, and the capacity of optical communication is also required to be higher. However, the transmission capacity of the single-core single-mode fiber has a nonlinear shannon transmission limit of 100Tb/s, and cannot meet future communication requirements. Optical signal spatial multiplexing methods based on optical fibers themselves have been proposed.
Spatial multiplexing is an effective method for solving the broadband crisis of an optical transmission network. The existing optical fibers for realizing spatial multiplexing include: multi-core fibers, few-mode fibers, and combinations of multi-core fibers and few-mode fibers. Wherein, the transmission capacity of the multi-core few-mode optical fiber formed by combining the multi-core optical fiber and the few-mode optical fiber reaches 10.16 Pb/s. The transmission capacity can be greatly improved by using mode multiplexing in the multi-core few-mode optical fiber, so that the capacity crisis is effectively solved. For example, CN111399123A discloses a method and an apparatus for generating an orthogonal mode multiplexing optical signal, and the patent application discloses an orthogonal mode multiplexing signal apparatus in detail.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to provide an optical amplification system for orthogonal mode multiplexing signals in long-distance transmission, wherein the signals maintain mode orthogonality in the transmission process so as to inhibit crosstalk between modes, and a ring core gain optical fiber structure in a transmission link has extremely low mode gain difference.
The technical scheme is as follows: the invention provides an optical amplification system of orthogonal mode multiplexing signals, which comprises an orthogonal mode multiplexing signal device, a mode photon lantern multiplexer, a mode photon lantern demultiplexer, an orthogonal mode pump optical system and a transmission link for optical amplification of the orthogonal mode multiplexing signals. The mode and phase of the pump light output by the orthogonal mode pump light system are consistent with the orthogonal mode multiplexing signal. The output end of the orthogonal mode multiplexing signal device and the output end of the orthogonal mode pumping light system are in signal connection with the input end of the mode photon lantern multiplexer, the output end of the mode photon lantern multiplexer is in signal connection with the input end of the transmission link, and the output end of the transmission link is in signal connection with the input end of the mode photon lantern demultiplexer.
The transmission link is composed of a ring core optical fiber and a ring core gain optical fiber. The ring core optical fiber is a carrier for orthogonal mode multiplexing signal transmission, can simultaneously transmit a plurality of mode signals, and keeps the orthogonality of the modes. The orthogonal mode multiplexing signal is reduced in signal power due to loss after long-distance transmission, and the ring core gain optical fiber can realize relay amplification of the orthogonal mode multiplexing signal.
The optical fiber layer in the ring core gain optical fiber is doped with a medium for optical amplification, and the medium can be erbium ions.
The orthogonal mode pump optical system comprises a laser, a wave separator, a mode converter, a phase controller and a pump mode multiplexer which are sequentially connected through signals. The pump light is injected into the erbium-doped optical fiber, erbium ions in a ground state are pumped to an excited state, the erbium ions are unstable in the excited state, and radiationless transition is carried out to a metastable state energy level with long particle life, so that the distribution inversion of erbium ion particle numbers is realized, and the gain balance is carried out on optical signals.
Has the advantages that: compared with the prior art, the invention has the following remarkable advantages: the orthogonal mode pump light system generates pump light multiplexed under different modes of 980nm, realizes coupling transmission of signal light and the pump light through orthogonal mode matching, and amplifies optical signals under different modes, so that low-mode coupled optical signal balance is realized, and a stable optical amplification system is provided for long-distance transmission of orthogonal mode multiplexed signals.
Drawings
FIG. 1 is a schematic diagram of the present invention;
fig. 2 is a view showing the structure of a gain optical fiber according to the present invention.
Detailed Description
The technical scheme of the invention is further explained by combining the attached drawings.
As shown in fig. 1, the optical amplification system for quadrature-mode multiplexed signals includes a quadrature-mode multiplexed signal device and a quadrature-mode pump optical system, where the quadrature-mode multiplexed signal output by the former is identical in mode and phase with the pump light output by the latter. The orthogonal mode multiplexing signal is input to a mode1-4 port of the mode photon lantern multiplexer, the pump light is input to a mode5 port, the pump light is input to a transmission link through the mode photon lantern multiplexer in a coupling mode, signal light amplification is carried out after long-distance transmission, and the mode photon lantern demultiplexer is guaranteed to effectively receive the orthogonal mode multiplexing signal.
The laser beam generated by the laser in the orthogonal mode pump light system is divided into a plurality of laser beams with the same power through the wave splitter, different laser beams are subjected to mode conversion through the mode converter, different mode lasers are subjected to phase control, a plurality of pump modes are integrated through the pump mode multiplexer, and a path of pump light is formed and coupled and input to a mode5 port.
The orthogonal mode multiplexing signal is input to a mode1-4 port, and the mode photon lantern multiplexer couples and multiplexes different orthogonal modes and pumping modes into one optical signal.
In order to realize the gain balance of the orthogonal mode multiplexing signals, a multi-layer ring core optical fiber structure needs to be established, so that an optical fiber gain section and a refractive index section are not completely overlapped, and extremely low mode gain difference is realized.
The mode field distribution u in the multilayer annular core optical fiber is expressed as follows in a cylindrical coordinate system:
where n (r) is the fiber refractive index distribution, k is the wavenumber, β is the longitudinal transmission constant of the mode, and r is the radius independent variable in a cylindrical coordinate system. Solving equation (1) using the scalar method, the following conclusions are reached:
① the guided mode exhibits a standing wave distribution in the core in the radial direction, i.e. ni>β/ k（niRefractive index of the i-th layer mode field), the field distribution obtained by solving is as follows:
② in the cladding, the conduction mode decays in the radial direction, i.e. ni<β/k, the resulting field distribution is:
wherein m is the order of Bessel equation, r,
α is undetermined coefficient, J is imaginary unit, ai and bi are weight coefficients, J is coordinate independent variable in cylindrical coordinate systemm、NmFirst and second class of mth order Bessel function, Im、KmModified m-th order shellfish of the first and second classes respectivelyThe Seal function. Normalized transverse phase parameter U in equations (2) and (3)iAnd normalized transverse attenuation parameter WiCan be expressed as
Where a is the radius of the core.
Therefore, the mode field distribution of each layer can be calculated according to the boundary conditions and the mode number m of each layer of the optical fiber and the formulas (2) to (4), so that the mode field distribution condition can be obtained. Because of the multi-layer fiber structure, the gain profile and the refractive index profile do not completely overlap.
And establishing a theoretical model between the parameters of the active optical fiber and the mode gain according to the mode field distribution characteristics of each layer of the ring-core optical fiber. Fig. 2 shows a cross-sectional view of a multi-layer structure of a ring-core optical fiber, which sequentially comprises a middle cladding 5, a first optical fiber layer 4, a first cladding 3, a second optical fiber layer 2, and a low-refractive-index groove 1 from inside to outside.
The transmission link is formed by sequentially combining a Ring Core Fiber (RCF), a ring core gain fiber (RC-EDF) and a Ring Core Fiber (RCF). In the ring core gain optical fiber, the optical fiber is doped with erbium ions.
The orthogonal mode multiplexing signals are transmitted in the ring core optical fiber, so that the orthogonality of the signals is not damaged, and the signals are amplified in the ring core gain optical fiber in a balanced manner, so that the long-distance transmission of the orthogonal mode multiplexing optical signals is ensured.
Pumping light is injected into the erbium-doped fiber, erbium ions in a ground state are pumped to an excited state, the erbium ions are unstable in the excited state, and radiationless transition is performed to a metastable state energy level with long particle life, so that the distribution inversion of erbium ion particle number is realized.
The orthogonal mode pump light system is respectively connected to two sides of the mode photon lantern multiplexer and the mode photon lantern demultiplexer, and pump light is relatively uniform at each position of the erbium-doped fiber and has the dual characteristics of high power and low noise.
Claims (3)
1. An optical amplification system of orthogonal mode multiplexing signals comprises an orthogonal mode multiplexing signal device, a mode photon lantern multiplexer and a mode photon lantern demultiplexer, and is characterized by further comprising an orthogonal mode pump optical system used for outputting pump light consistent with the mode and the phase of the orthogonal mode multiplexing signals; the optical amplifier also comprises a transmission link for optical amplification of the orthogonal mode multiplexing signals; the output end of the orthogonal mode multiplexing signal device and the output end of the orthogonal mode pumping light system are in signal connection with the input end of the mode photon lantern multiplexer, the output end of the mode photon lantern multiplexer is in signal connection with the input end of the transmission link, the output end of the transmission link is in signal connection with the input end of the mode photon lantern demultiplexer, the transmission link is composed of a ring core optical fiber and a ring core gain optical fiber, the ring core optical fiber and the ring core gain optical fiber structure comprise an optical fiber layer and a cladding layer, the cladding layers are arranged on two sides of the optical fiber layer, and the optical fiber layer in the ring core gain optical fiber is doped with a medium for optical amplification.
2. The optical amplification system for quadrature mode multiplexed signals of claim 1, wherein the quadrature mode pump optical system comprises a laser, a demultiplexer, a mode converter, a phase controller and a pump mode multiplexer, which are connected in sequence by a signal.
3. The optical amplification system for quadrature mode multiplexed signals of claim 1, wherein the mode photon lantern demultiplexer has an output connected to a quadrature mode pump light.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010800168.6A CN111682921A (en) | 2020-08-11 | 2020-08-11 | Optical Amplification System for Multiplexed Signals in Orthogonal Mode |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010800168.6A CN111682921A (en) | 2020-08-11 | 2020-08-11 | Optical Amplification System for Multiplexed Signals in Orthogonal Mode |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111682921A true CN111682921A (en) | 2020-09-18 |
Family
ID=72458228
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010800168.6A Pending CN111682921A (en) | 2020-08-11 | 2020-08-11 | Optical Amplification System for Multiplexed Signals in Orthogonal Mode |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111682921A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022122016A1 (en) * | 2020-12-11 | 2022-06-16 | 华为技术有限公司 | Optical amplification apparatus and mode division multiplexing system comprising optical amplification apparatus |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120262780A1 (en) * | 2011-04-13 | 2012-10-18 | Nec Laboratories America, Inc. | Multimode optical amplifier with close-loop modal gain control |
| CN109802289A (en) * | 2019-03-11 | 2019-05-24 | 电子科技大学 | Mould erbium-doped fiber amplifier is lacked in a kind of low difference mode gain |
| CN110244404A (en) * | 2019-06-18 | 2019-09-17 | 烽火通信科技股份有限公司 | A kind of annular doped core optical fiber of low decaying |
-
2020
- 2020-08-11 CN CN202010800168.6A patent/CN111682921A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120262780A1 (en) * | 2011-04-13 | 2012-10-18 | Nec Laboratories America, Inc. | Multimode optical amplifier with close-loop modal gain control |
| CN109802289A (en) * | 2019-03-11 | 2019-05-24 | 电子科技大学 | Mould erbium-doped fiber amplifier is lacked in a kind of low difference mode gain |
| CN110244404A (en) * | 2019-06-18 | 2019-09-17 | 烽火通信科技股份有限公司 | A kind of annular doped core optical fiber of low decaying |
Non-Patent Citations (2)
| Title |
|---|
| Y. JUNG 等: "Few Mode Ring-Core Fibre Amplifier for Low Differential Modal Gain", 《2017 EUROPEAN CONFERENCE ON OPTICAL COMMUNICATION (ECOC)》 * |
| 赵毓静: "基于环形芯光纤的矢量光束生成方法研究", 《中国优秀硕士学位论文全文数据库》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022122016A1 (en) * | 2020-12-11 | 2022-06-16 | 华为技术有限公司 | Optical amplification apparatus and mode division multiplexing system comprising optical amplification apparatus |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Abedin et al. | Amplification and noise properties of an erbium-doped multicore fiber amplifier | |
| JP5823448B2 (en) | Multicore optical fiber device for amplification and multicore optical fiber amplifier | |
| CN112510472B (en) | Few-mode erbium-doped optical fiber and few-mode erbium-doped optical fiber amplifier | |
| Abedin et al. | State-of-the-art multicore fiber amplifiers for space division multiplexing | |
| JP2016127241A (en) | Multi-core optical amplifier and optical transmission system | |
| Chang et al. | Demonstration of an all-fiber cladding-pumped FM-EDFA with low differential modal gain | |
| Amma et al. | Ring-core multicore few-mode erbium-doped fiber amplifier | |
| CN112099129A (en) | An air hole few-mode gain equalization fiber based on layered doping | |
| JP2014236210A (en) | Multi-core optical transmission system, optical amplifier and component for optical amplification | |
| CN111682921A (en) | Optical Amplification System for Multiplexed Signals in Orthogonal Mode | |
| Jia et al. | Optical fiber amplifiers for space-division multiplexing | |
| WO2022122016A1 (en) | Optical amplification apparatus and mode division multiplexing system comprising optical amplification apparatus | |
| Wada et al. | Two-LP-mode six-core cladding pumped EDFA with high pump power density | |
| Jiang et al. | Experiments and simulation on the overall DMG of long-haul cascade FM-EDFA systems | |
| Ono et al. | Amplification technology for multi-core fiber transmission | |
| Zhang et al. | A practical in-line FM-EDFA based on cladding pumping for MIMO-free MDM amplification and transmission | |
| Zhou et al. | Detailed characterization of a high-gain, low differential modal gain and low gain flatness integrated FM-EDFA for multi-wavelength amplification | |
| JP7444677B2 (en) | Multi-core optical amplification fiber, multi-core optical fiber amplifier and optical communication system | |
| Maeda et al. | Cladding pumped multicore EDFA with output power over 20 dBm using a fiber based pump combiner | |
| CN104460178B (en) | The four online erbium-doped fiber amplifiers of linearly polarized mode flashlight and operation method | |
| Huang et al. | Low-modal-crosstalk doped-fiber amplifiers in few-mode-fiber-based systems | |
| Nassiri et al. | Numerical model of an Er^ 3+/Yb^ 3+ co-doped seven-core fiber amplifier for a space division multiplexing system | |
| Nassiri et al. | Modelisation of erbium doped seven-core fiber amplifier for telecommunication | |
| Wada et al. | Recent progress on SDM amplifiers | |
| CN112953643B (en) | An FM-EDFA automatic gain control device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200918 |
|
| RJ01 | Rejection of invention patent application after publication |