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CN109802289A - Mould erbium-doped fiber amplifier is lacked in a kind of low difference mode gain - Google Patents

Mould erbium-doped fiber amplifier is lacked in a kind of low difference mode gain Download PDF

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Publication number
CN109802289A
CN109802289A CN201910179153.XA CN201910179153A CN109802289A CN 109802289 A CN109802289 A CN 109802289A CN 201910179153 A CN201910179153 A CN 201910179153A CN 109802289 A CN109802289 A CN 109802289A
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mode
doped fiber
optical
pump
optical signal
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CN201910179153.XA
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武保剑
陈相玮
文峰
邱昆
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University of Electronic Science and Technology of China
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University of Electronic Science and Technology of China
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Priority to CN201910179153.XA priority Critical patent/CN109802289A/en
Priority to PCT/CN2019/079963 priority patent/WO2020181586A1/en
Publication of CN109802289A publication Critical patent/CN109802289A/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
    • H01S3/06—Construction or shape of active medium
    • H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
    • H01S3/067—Fibre lasers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/09—Processes or apparatus for excitation, e.g. pumping
    • H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
    • H01S3/094—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
    • H01S3/13—Stabilisation of laser output parameters, e.g. frequency or amplitude

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Optics & Photonics (AREA)
  • Lasers (AREA)
  • Optical Communication System (AREA)

Abstract

The invention discloses a kind of low difference mode gains to lack mould erbium-doped fiber amplifier, the optical signal of different mode is multiplexed into optical signal all the way by signal mode multiplexer, pass through again with the pump light of relevant pump unit output and is coupled to few mould Er-doped fiber after passing through optoisolator together with wavelength division multiplexer, few mould Er-doped fiber amplifies the optical signal of different mode, improve the gain of optical signal, the optical signal in effective bandwidth is finally filtered out by optical filter again, eliminate the noise jamming of other frequency bands, and it is demultiplexed by signal mode demultiplexer, obtain different mode optical signal.

Description

Mould erbium-doped fiber amplifier is lacked in a kind of low difference mode gain
Technical field
The invention belongs to technical field of photo communication, more specifically, are related to a kind of low difference mode gain and lack mould Er-doped fiber Amplifier.
Background technique
In order to break through the transmission capacity limitation of conventional single mode fiber system, with multi-core optical fiber, less fundamental mode optical fibre, few mould multi-core optical Fine and orbital angular momentum etc. becomes fiber optic communication field research hotspot for the space division multiplexing of representative or mode division multiplexing technology, they from Optical fiber transmission capacity is improved on Spatial Dimension.In mode division multiplexing system, few mould erbium-doped fiber amplifier can simultaneously amplify more A mode effectively reduces the transmission cost of every bit.
The amplification of six spatial models at most can be achieved in commercial few mould erbium-doped fiber amplifier product at present, further increases One of the significant challenge for adding mode passageway number is the gain balance problem of mode, that is to say, that between each mode channel Gain inequality (also known as difference mode gain) directly affects system break probability, and having low difference mode gain is mode division multiplexing system to few mould The most basic requirement of erbium-doped fiber amplifier.
Existing amplifier is as shown in Figure 1.The signal light of different mode is multiplexed into an optical fiber by signal mode multiplexer In, output optical signal and pump light that laser exports by wavelength division multiplexer together be coupled into traditional Er-doped fiber；? Then the output end of Er-doped fiber decomposites amplification using signal mode demultiplexer using optical filter filtering pump light Different mode signal light.In addition, being increased to enhance the performance of few mould erbium-doped fiber amplifier at the both ends of Er-doped fiber Optoisolator.
There are mainly two types of the methods of the existing reduction difference mode gain generallyd use: first is that the luminous intensity point of control pump mode Intensity signal is only utilized in cloth, controls inaccurate.Second is that design Er-doped fiber structure, erbium ion-doped in optical fiber to optimize Distribution, but optimize still according to intensity signal, and the design dependent on complicated Er-doped fiber structure, manufacturing process are complicated.Two kinds of sides Method equilibrium difference mode gain ability is limited, and flexibility is insufficient, uncontrollable between mode, it is difficult to take into account all modes.
Summary of the invention
It is an object of the invention to overcome the deficiencies of the prior art and provide a kind of low difference mode gains to lack mould Erbium-doped fiber amplifier Device, using the gain balance of pumping beat effect control amplifier, to reduce difference mode gain while obtaining higher gain.
For achieving the above object, mould erbium-doped fiber amplifier is lacked in a kind of low difference mode gain of the present invention, which is characterized in that Include:
One relevant pump unit, including pump laser, channel-splitting filter, mode converter, phase controller and pumping mould point Multiplexer；
The pump laser generates high-power pump light signals, and is input to channel-splitting filter, and channel-splitting filter is by pump light Signal is divided into multichannel pump light signals；The road mode converter Zai Jiangmei pump light signals are transformed into required pump mode, then The initial phase for changing the multichannel pump light signals of symport by phase controller, finally will be different by pump mode multiplexer The multichannel pump light signals of initial phase are multiplexed into an optical fiber, and the output signal as relevant pump unit；
External different mode optical signal is multiplexed into an optical fiber, and is input to wavelength-division by one signal mode multiplexer Multiplexer；
One wavelength division multiplexer answers the optical signal for optical signal and signal mode the multiplexer output that relevant pump unit exports At least mould Er-doped fiber is inputted at optical signal all the way, and by the first optoisolator；
First optoisolator, for reducing fiber reflection in the transmission of few mould Er-doped fiber to pump laser and light amplification The influence of process；
One few mould Er-doped fiber, amplifies input optical signal, improves the gain of input optical signal, then pass through second Optoisolator is input to optical filter；
Second optoisolator, for reducing influence of the reflection to few mould Erbium-doped fiber amplifier process of subsequent optical device；
One optical filter is filtered the optical signal of input, eliminates the noise jamming of other frequency bands, exports effective bandwidth Interior optical signal；
One signal mode demultiplexer, demultiplexes filtered optical signal, obtains the optical signal under different mode.
Goal of the invention of the invention is achieved in that
Mould erbium-doped fiber amplifier is lacked in a kind of low difference mode gain of the present invention, and the optical signal of different mode is multiple by signal mode Be multiplexed into optical signal all the way with device, then with the pump light of relevant pump unit output by wavelength division multiplexer together with pass through optical isolation It is coupled to few mould Er-doped fiber after device, few mould Er-doped fiber amplifies the optical signal of different mode, improves the increasing of optical signal Benefit finally filters out the optical signal in effective bandwidth by optical filter again, eliminates the noise jamming of other frequency bands, and passes through signal Pattern demultiplexer demultiplexing, obtains different mode optical signal.In this way, the present invention is other than controlling pump power, moreover it is possible to increase The control of phase has stronger flexibility, and is not only adapted to incoherent mode division multiplexing system, is also applied for few mould signal Coherent mold division multiplexing system.
Figure of description
Fig. 1 is the schematic diagram of traditional erbium-doped fiber amplifier；
Fig. 2 is the schematic diagram that mould erbium-doped fiber amplifier is lacked in a kind of low difference mode gain of the present invention；
Fig. 3 is the mode Beat length of pump light or signal light and the relation schematic diagram of Er-doped fiber length；
Fig. 4 is that phase difference is random between pumping optical mode and fixes under two kinds of situations, and the signal gain of light is with Er-doped fiber length Change curve.
Specific embodiment
A specific embodiment of the invention is described with reference to the accompanying drawing, preferably so as to those skilled in the art Understand the present invention.Requiring particular attention is that in the following description, when known function and the detailed description of design perhaps When can desalinate main contents of the invention, these descriptions will be ignored herein.
Embodiment
Fig. 2 is that mould erbium-doped fiber amplifier schematic diagram is lacked in a kind of low difference mode gain of the present invention.
In the present embodiment, as shown in Fig. 2, mould erbium-doped fiber amplifier is lacked in a kind of low difference mode gain of the present invention, comprising: phase Dry pump unit, signal mode multiplexer, wavelength division multiplexer, the first optoisolator, few mould Er-doped fiber, the second optoisolator, Optical filter filter and signal mode demultiplexer.
Wherein, as shown in Fig. 2, relevant pump unit includes pump laser, channel-splitting filter, mode converter, phase control again Device processed and pumping mode division multiplexing device；
Pump laser generates high-power pump light signals, and is input to channel-splitting filter, and pump light signals are by channel-splitting filter Multichannel pump light signals；The road mode converter Zai Jiangmei pump light signals are transformed into required pump mode, then pass through phase Controller changes the initial phase of the multichannel pump light signals of symport, finally by pump mode multiplexer by different initial phases Multichannel pump light signals are multiplexed into an optical fiber, and the output signal as relevant pump unit；
External different mode optical signal is multiplexed into an optical fiber by signal mode multiplexer, and it is multiple to be input to wavelength-division Use device；
The optical signal multiplexing of wavelength division multiplexer, the optical signal that relevant pump unit is exported and the output of signal mode multiplexer At optical signal all the way, and pass through the first optoisolator input at least mould Er-doped fiber；
First optoisolator, for reducing fiber reflection in the transmission of few mould Er-doped fiber to pump laser and light amplification The influence of process；
Few mould Er-doped fiber, amplifies input optical signal, improves the gain of input optical signal, then passes through the second light Isolator is input to optical filter；
In the present embodiment, in few mould Er-doped fiber, its respective wavelength when pump light signals or external optical signal transmission The Beat length for locating two mode lights depends on Er-doped fiber structure and dispersion characteristics, and Beat length meets:
L2π=2 π/Δ β
Wherein, Δ β is that the propagation constant between two mode optical signals is poor, can be obtained by the dispersion characteristics of Er-doped fiber, It is related with the specifically distribution of fibre core and cladding index.
In the present embodiment, pump wavelength is typically chosen 980nm or 1480nm, and signal light wavelength 1530~ 1565nm wave band.Multimode pump light is in few mould Er-doped fiber when symport, and the Beat length between mode is sufficiently large, to have Effect control multimode pump light between energy conversion, and the Beat length between the few mould signal that need to amplify answer it is sufficiently small, to prevent Crosstalk between stop signal mode, as shown in Figure 3.
(phase difference is random between pumping optical mode) is pumped under situation in tradition, in order to keep each signal mode that can obtain Biggish gain, in addition to being matched using pump mode appropriate and optical power size with erbium ion concentration distribution, it is important to optimize The length of Er-doped fiber, and difference mode gain is controlled in a certain range, in the present embodiment, the length of few mould Er-doped fiber should approach The intermode Beat length L of multimode simultaneous interpretation pump light2π。
In the present embodiment, as shown in figure 4, by adjusting the phase controller in relevant pump unit, to change biography in the same direction The initial phase of defeated multimode pump light, to control difference mode gain size.
Second optoisolator, for reducing influence of the reflection to few mould Erbium-doped fiber amplifier process of subsequent optical device；
Optical filter is filtered the optical signal of input, eliminates the noise jamming of other frequency bands, exports in effective bandwidth Optical signal；
Signal mode demultiplexer demultiplexes filtered optical signal, obtains the optical signal under different mode.
In addition, relevant pump unit can also be placed on after few mould Er-doped fiber by the present invention, realize to few mould er-doped Optical fiber backward pump, or one is respectively placed before and after few mould Er-doped fiber, it realizes to few mould Er-doped fiber bi-directionally pumping, thus Mould erbium-doped fiber amplifier is lacked in the low difference mode gain for deriving different structure mode.
Example
For ease of description, it is assumed that the mode of signal light and pump light is LP01And LP11aTwo kinds of linear polarization modes.
Firstly, using LP01And LP11aThe pump light of both of which carries out Pumped to few mould Er-doped fiber.In phase dry pump In the unit of Pu, pump laser exports LP01The high power 980nm pump light of mode, is then divided into two bundles by 1 × 2 channel-splitting filter, Wherein, a branch of that LP is converted to by mode converter11aMould, finally by pump mode multiplexer by LP01And LP11aThe pump of both of which Pu recovery is used in an optical fiber.
Secondly, the dispersion characteristics of few mould Er-doped fiber and the structure of optical fiber are closely related, consider that weak lead of step change type is mixed here Erbium optical fiber, erbium ion total concentration are 2 × 1024m-3And Uniform Doped is in fibre core.The propagation constant of Er-doped fiber can be by step light Fine characteristic equation specifically calculates, and can optimize the refractive index and structure size of fibre core and covering accordingly.According to the requirement of Fig. 3, Beat length at 980nm pump wavelength should be greater than the Beat length of 1550nm signal light-wave strong point, we can take 980nm Beat length at pump wavelength is 9 meters.
Under given erbium ion concentration distribution, LP is first taken01And LP11aThe pumping light power of mode is 62.5mW.When not Pump mode position phase is controlled, i.e., (corresponds to tradition pumping situation) when the initial position difference of above-mentioned two pump mode is random, signal The gain of light is with the change curve of Er-doped fiber length as shown in figure 4, wherein the initial power of signal light is 0.1mW.It can by Fig. 4 Know, gain is bigger, and difference mode gain is also bigger, to keep the higher signal gain of light (being greater than 20dB), the length of Er-doped fiber can 5 meters are taken, less than 9 meters of Beat length at 980nm pump wavelength, difference mode gain at this time is 1.85dB.
Finally, adjusting the phase controller in relevant pump unit, differs the initial position of the pump light of symport and fix In the radian of π/8, the signal gain of light at this time is as shown in Figure 4 with the change curve of Er-doped fiber length.When the length of Er-doped fiber LP when taking 5 meters01And LP11aThe gain of mode can get the difference mode gain close to zero more than 21dB.
Then low difference mode gain shown in Fig. 2 is built according to above-mentioned component and lack mould erbium-doped fiber amplifier, be not only adapted to non- Coherent mold division multiplexing system is also applied for the coherent mold division multiplexing system of few mould signal.
Although the illustrative specific embodiment of the present invention is described above, in order to the technology of the art Personnel understand the present invention, it should be apparent that the present invention is not limited to the range of specific embodiment, to the common skill of the art For art personnel, if various change the attached claims limit and determine the spirit and scope of the present invention in, these Variation is it will be apparent that all utilize the innovation and creation of present inventive concept in the column of protection.

Claims (4)

1.一种低差模增益少模掺铒光纤放大器，其特征在于，包括：1. a low differential mode gain few mode erbium-doped fiber amplifier is characterized in that, comprising: 一相干泵浦单元，包括泵浦激光器、分波器、模式转换器、相位控制器和泵浦模分复用器；a coherent pump unit, including a pump laser, a demultiplexer, a mode converter, a phase controller and a pump mode division multiplexer; 所述的泵浦激光器产生高功率的泵浦光信号，并输入至分分波器，分波器将泵浦光信号为多路泵浦光信号；模式转换器再将每路泵浦光信号转换到所需的泵浦模式上，再通过相位控制器改变同向传输的多路泵浦光信号的初位相，最后由泵浦模式复用器将不同初位相的多路泵浦光信号复用到一根光纤中，并作为相干泵浦单元的输出信号；The pump laser generates a high-power pump optical signal, which is input to the demultiplexer, and the demultiplexer converts the pump optical signal into a multi-channel pump optical signal; the mode converter then converts each channel of the pump optical signal into Switch to the desired pump mode, and then change the initial phase of the multi-channel pump optical signals transmitted in the same direction through the phase controller, and finally the multi-channel pump optical signals of different initial phases are complexed by the pump mode multiplexer. used in an optical fiber and used as the output signal of the coherent pump unit; 一信号模式复用器，将外接的不同模式光信号复用到一根光纤中，并输入至波分复用器；A signal mode multiplexer, multiplexing the external optical signals of different modes into one optical fiber, and inputting it to the wavelength division multiplexer; 一波分复用器，将相干泵浦单元输出的光信号和信号模式复用器输出的光信号复用成一路光信号，并通过隔离器输入至少模掺铒光纤；a wavelength division multiplexer, which multiplexes the optical signal output by the coherent pump unit and the optical signal output by the signal mode multiplexer into one optical signal, and inputs the at least mode erbium-doped fiber through the isolator; 第一光隔离器，用于降低少模掺铒光纤传输中光纤反射对泵浦激光器以及光放大过程的影响；The first optical isolator is used to reduce the influence of the reflection of the fiber on the pump laser and the optical amplification process in the transmission of the few-mode erbium-doped fiber; 一少模掺铒光纤，对输入光信号进行放大，提高输入光信号的增益，然后通过第二光隔离器输入至光滤波器；a few-mode erbium-doped fiber, amplifies the input optical signal, improves the gain of the input optical signal, and then inputs it to the optical filter through the second optical isolator; 第二光隔离器，用于降低后续光器件的反射对少模掺铒光纤放大过程的影响；The second optical isolator is used to reduce the influence of the reflection of subsequent optical devices on the amplification process of the few-mode erbium-doped fiber; 一光滤波器滤，对输入的光信号进行滤波，消除其它频带的噪声干扰，输出有效带宽内的光信号；An optical filter filter, which filters the input optical signal, eliminates the noise interference of other frequency bands, and outputs the optical signal within the effective bandwidth; 一信号模式解复用器，对滤波后的光信号进解复用，得到不同模式下的光信号。A signal mode demultiplexer demultiplexes the filtered optical signals to obtain optical signals in different modes. 2.根据权利要求1所述的一种低差模增益少模掺铒光纤放大器，其特征在于，所述的相干泵浦单元还能够放置在少模掺铒光纤之后，实现对少模掺铒光纤后向抽运，或者在少模掺铒光纤前后各放置一个，实现对少模掺铒光纤双向抽运，从而衍生出不同结构方式的低差模增益少模掺铒光纤放大器。2. a kind of low differential mode gain few-mode erbium-doped fiber amplifier according to claim 1, is characterized in that, described coherent pumping unit can also be placed behind the few-mode erbium-doped fiber, realizes to the few-mode erbium-doped fiber The fiber is pumped backwards, or one is placed before and after the few-mode erbium-doped fiber to realize bidirectional pumping of the few-mode erbium-doped fiber, thereby deriving low-differential-mode-gain few-mode erbium-doped fiber amplifiers with different structures. 3.根据权利要求1所述的一种低差模增益少模掺铒光纤放大器，其特征在于，所述的少模掺铒光纤中，泵浦光信号和外接光信号传输时其相应波长处的差拍长度满足：3. a kind of low differential mode gain few-mode erbium-doped fiber amplifier according to claim 1, is characterized in that, in the described few-mode erbium-doped fiber, when the pump optical signal and the external optical signal are transmitted, its corresponding wavelength is The beat length of satisfies: L2π＝2π/ΔβL 2π = 2π/Δβ 其中，Δβ为两个模式光信号之间的传播常数差。Among them, Δβ is the propagation constant difference between the two mode optical signals. 4.根据权利要求1所述的一种低差模增益少模掺铒光纤放大器，其特征在于，所述的少模掺铒光纤的长度应接近多模同传泵浦光的模间差拍长度L2π。4. a kind of low differential mode gain few-mode erbium-doped fiber amplifier according to claim 1, is characterized in that, the length of described few-mode erbium-doped fiber should be close to the inter-mode beat of multi-mode simultaneous transmission pump light length L 2π .
CN201910179153.XA 2019-03-11 2019-03-11 Mould erbium-doped fiber amplifier is lacked in a kind of low difference mode gain Pending CN109802289A (en)

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PCT/CN2019/079963 WO2020181586A1 (en) 2019-03-11 2019-03-27 Low differential mode gain few-mode erbium-doped fiber amplifier

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