CN1210854C - Variable wavelenght output optic fibre laser - Google Patents
Variable wavelenght output optic fibre laser Download PDFInfo
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- CN1210854C CN1210854C CNB021022488A CN02102248A CN1210854C CN 1210854 C CN1210854 C CN 1210854C CN B021022488 A CNB021022488 A CN B021022488A CN 02102248 A CN02102248 A CN 02102248A CN 1210854 C CN1210854 C CN 1210854C
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Abstract
The present invention relates to an optical fibre laser with variable-wavelength output, which mainly comprises a pumping source, an optical coupler, a polarization controller, an arrayed waveguide grating and an optical beam splitter which are orderly connected to form a loop. Because the present invention smartly uses a mature AWG technology, the AWG is connected in series with an optical fiber loop with adulterate optical fiber, the AWG is used as an optical filter in a cavity to realize the selection of a set of resonant wavelengths and the establishment of amplified radiation, and after the wave combination, the multiplex end of the AWG and the pumping light are coupled into the adulterate optical fiber through an optical fiber coupler, and thereby, the single pumping source can amplify variable wavelengths, and the device structure is simplified; because the waveguide integrated structure of the AWG, the device size can be reduced, the structural stability of the device can be enhanced, light sources with different wavelengths and wavelength intervals can be conveniently realized through altering structural parameters of the AWG, and standard wavelengths and wavelength intervals of C-Band and L-Band of ITU-T can be reliably realized.
Description
Technical field
The present invention relates to a kind of optical fiber source, particularly a kind of optical fiber source with variable wavelength output is suitable for using amplified spont-aneous emission (ASE) light as auxiliary pumping source.
Background technology
Broadband light source has been carried out lasting research, and reason is that they have many application, as the modulated spectrum that expands to gyrosensor, is used for the light source of measuring optical element and is used for common access network.The light source of ASE light that is used to the optical fiber of autodoping rare earth metal (such as bait) especially is better broadband light source, reason is that they show as broadband, high power and low loss characteristic, all researchs of doing for this erbium-doped fiber (EDF) broadband light source make great efforts all be about from 1520 to 1560 nano wavebands be the single wave band of C-band (C-Band), existing most light communication element and traditional Erbium-Doped Fiber Amplifier EDFA are operated in this wave band.Yet development along with dense wave division multipurpose (DWDM--Densed Wavelength Devided Multiples) optical transmission system, variable wavelength output LASER Light Source simple in structure, easy realization has the meaning of particular importance, export when multichannel light-source structure not only can be realized variable wavelength laser, and can reach the purpose of wavelength Fast Adjustable at an easy rate by the selector channel.But also ripe without comparison at present multichannel variable wavelength export structure, general method is that single wavelength (DBR--Distributed Bragg Reflector) laser or fiber laser are made array package together, there is complex structure in it, the problem of unstable properties, and each wavelength needs independent driving voltage or temperature control etc.Tunable laser based on mode locking has obtained very big concern in the recent period, but this method has special restriction to transmission rate, in recent years, array waveguide grating (AWG Arrayed Waveguide Grating) technical development is very fast, its performance, price have reached the degree of commercialization, array waveguide grating AWG can be used as the integrated optical filter array, but array waveguide grating AWG should not found as yet in fiber laser.
Summary of the invention
The variable wavelenght output optic fibre laser that the purpose of this invention is to provide a kind of effectively simplified structure, reduction of device size, raising device architecture stability.
For achieving the above object, variable wavelenght output optic fibre laser comprises pumping source, optical coupler, fiber amplifier, Polarization Controller, beam splitter, it is characterized in that also comprising optical switch and array waveguide grating, wherein, optical coupler, fiber amplifier, Polarization Controller, optical switch, array waveguide grating, beam splitter connect to form loop in regular turn, and export as light signal by a part of light that beam splitter is separated, a part of light turns back in the loop as feedback and passes through to be continued to amplify by fiber amplifier behind the optical coupler as light input signal.
The present invention is owing to utilize present mature array waveguide grating AWG technology dexterously, array waveguide grating AWG is serially connected in the optical fiber circuit that has doped fiber, realize the selection of one group of resonant wavelength and the foundation of amplification radiation by array waveguide grating AWG as optical filter in the chamber, realize the connection of the loop of selected wavelength by optical switch, be coupled into doped fiber with pump light by fiber coupler behind the ECDC ripple, thereby realize amplification and output the light of this selected wavelength.Optical switch is communicated with the path of different wave length, has just realized the selection to wavelength, has set up the light source output of specific wavelength.Simultaneously because the waveguide integrated morphology of array waveguide grating AWG, size that can reduction of device improves the stability of device architecture.And since the optical wavelength of output and the interval between the wavelength by the structures shape of array waveguide grating AWG, therefore can realize the different wavelength and the multi-wavelength variable light source of wavelength interval by the structural parameters that change array waveguide grating AWG easily, realize C-Band and L-Band standard wave length and the wavelength interval of ITU-T reliably, effectively expand wave band range of application of the present invention; Whether and the present invention can also be easily realize the adjusting of output intensity by regulating the pumping light intensity, and can be communicated with according to corresponding light path, realizes that easily the wavelength of light source is selected.
Describe basic composition of the present invention and operation principle in detail below in conjunction with drawings and Examples:
Description of drawings
Fig. 1 is that structure of the present invention is formed schematic diagram;
Fig. 2 is that the structure of further embodiment of the present invention is formed schematic diagram;
Fig. 3 is that the structure of optical switch of the present invention is formed schematic diagram;
Fig. 4 is the structural representation that the present invention uses in optical transmission system;
Embodiment
As shown in Figure 1, variable wavelength laser provided by the invention comprises pumping source, optical coupler 1, fiber amplifier 2, Polarization Controller 3, optical switch 4, array waveguide grating 6 and beam splitter 7.The pump light that pumping source produces is from a port input of optical coupler 1, be coupled with the part output light that beam splitter 7 separates that passes through from optical coupler 1 another port input, output to fiber amplifier then and carry out light amplification, pass through Polarization Controller (PC--Polarization Controller) 3 again and carry out the polarization adjustment, the light signal of adjusting through polarization is under the effect of optical switch 4, the light of different wave length can be outputed to array waveguide grating (AWG, Arrayed Waveguide Grating) in 6 the different passage 5, when a certain specific wavelength is input to AWG, just can realize that by the grating effect of AWG the filtering of this specific wavelength is tuning, finish the resonance of the light of selected wavelength and amplify, after beam splitter 7 is exported this laser as output light.In conjunction with the accompanying drawings the each several part of variable wavelength laser is elaborated again below.
As shown in Figure 1, pumping source provides pump light Pp for optical coupler 1, and the pumping source that do not draw in Fig. 1 only provides the diagram of pump light Pp.Optical coupler (FC--FiberCoupler) 1 is connected between pumping source and the fiber amplifier 2, the pump light of pumping source and light input signal are coupled and transfer to fiber amplifier 2; Under the pump light light stimulus of pumping source, fiber amplifier 2 is used to produce the spontaneous emission light of various wavelength and direction, in the present embodiment, fiber amplifier 2 is selected erbium-doped fiber (EDF--Erbium DopedFiber) amplifier for use, promptly uses erbium-doped fiber EDF as gain media; Because erbium-doped fiber amplifier has the gain unevenness, under the identical pump power, the different wave length Output optical power can be different.For fear of Output optical power generation drastic change when wavelength switches, can be by regulating the intensity of pumping light power intensity adjustments Output optical power, also can between fiber amplifier 2 and Polarization Controller 3, increase a gain flattening filter GFF (Gain FlatFilter) 8 as shown in Figure 2 in addition, realize the gain balance of different wavelengths of light, improve the flat gain characteristic of fiber amplifier 2.In addition,, guarantee the light-source structure steady operation, can before and after light is put, increase isolator (Isolator), as shown in Figure 1 and Figure 2 for the amplification that makes EDF is not subjected to catoptrical the influence.Polarization Controller (PC--Polarization Controller) 3 is connected fiber amplifier 2 back, is used to adjust the spontaneous radiation polarization state of light that fiber amplifier 2 produces.
Optical switch 4 is connected between Polarization Controller 3 and the array waveguide grating 6, and the structure of optical switch 4 is formed as shown in Figure 3, is made up of the optical switch of a 1 * N and N * 1.Optical transceiver among Fig. 3 before and after the optical switch is the input and output that are used for representing light for the effect that optical switch is described.In the present invention, can corresponding diagram 1 in image intensifer 2 and array waveguide grating afterwards (AWG--Arrayed Waveguide Grating) 6 before the optical switch 4.Optical switch is that the light of a certain specific wavelength of the adjusted spontaneous emission light of the polarization state input light as array waveguide grating 6 is communicated in the specific wavelength passage 5 of array waveguide grating 6; Wherein the implementation method of light shutter device is a lot, and in development.General implementation method has mechanical type, hot light, electric light, acoustooptical effect etc., can be according to performance demands is selected for use.Traditional mechanical switch (for example moving fiber) technology is comparative maturity, but response speed is slow, the MEMS (micro electro mechanical system) that immediate development is got up (MEMS:Micro-electro-michanical sys terns) optical switch response speed is than very fast, and Insertion Loss is little, can be used as first-selection, its basic principle is the array surface of integrated a lot of realization direct reflection functions on a chip, can change the reflecting surface angle by regulating injection current, thereby change the transmission direction of light, incident light is exported from different outlets, thus the switching function of realization light signal.
Array waveguide grating (AWG--Arrayed Waveguide Grating) 6 is suitable for realizing the selection of one group of resonant wavelength and the foundation of amplification radiation as optical arrays filter in the chamber, select through optical switch, the passage 5 of a certain specific wavelength λ of AWG (Arrayed Waveguide Grating) 6 is connected, thereby the grating effect by AWG can realize that the filtering of specific wavelength λ is tuning, finishes the resonance of the light of selected wavelength and amplifies.Selectable wavelength and wavelength interval are by the structures shape of AWG.
Beam splitter (BS--Beam Splitter) 7 is connected the output of array waveguide grating AWG6, be used for the light that array waveguide grating AWG6 closes behind the ripple is divided into two parts, part light is exported as optical output signal, part light turns back in the loop as feedback and continues to be exaggerated by fiber amplifier 2 as light input signal, wherein the ratio of output intensity and feedback light intensity can be realized by the transmittance and the reflectance of regulating beam splitter, thereby the erbium-doped fiber amplifier that can select C-Band or L-Band is realized single pumping the broadband of C-Band or L-Band is amplified, makes tuning wavelength optional in C-Band or L-Band scope.
(Densed Wavdength DevidedMaltipler, DWDM) application in the fiber optic transmission system is referring to Fig. 4 in dense wave division multipurpose in the present invention.Optical transmission system shown in Figure 4 comprises multiplexer MUX, add-drop multiplexer (A/DM) and interconnection (XC) equipment etc.As Wavelength variable light source, the present invention can be used for optical transmission system transmitting terminal MUX light source and channel wavelength protection light source, and when a certain passage lasing light emitter broke down, the adjustable variable light source substituted to this wavelength.Adopt the present invention program just not need therefore can save standby LASER Light Source for each light source is equipped with a standby power source.Simultaneously, the present invention can be used on the wavelength of Optical Add Drop Multiplexer (OADM--Optical Add and Drop Multiplex)/setting out on a journey of following road A/DM (Add/Drop) make a start, and realizes on optical wavelength flexibly/following road.In addition, the present invention also can be used in light intersection (OXC--Optical Cross-Connect) link block and realizes wavelength Conversion, solves the problem that light intersection medium wavelength blocks.
Claims (3)
1, a kind of variable wavelenght output optic fibre laser, comprise pumping source, optical coupler (1), fiber amplifier (2), Polarization Controller (3), beam splitter (7), it is characterized in that also comprising optical switch (4) and array waveguide grating (6), optical coupler (1) wherein, fiber amplifier (2), Polarization Controller (3), optical switch (4), array waveguide grating (6), beam splitter (7) connects to form loop in regular turn, and export as light signal by a part of light that beam splitter (7) is separated, a part of light turns back in the loop as feedback and is continued to amplify by fiber amplifier (2) by optical coupler (1) back as light input signal.
2,, it is characterized in that above-mentioned fiber amplifier (2) is an Erbium-Doped Fiber Amplifier according to the described variable wavelenght output optic fibre laser of claim 1.
3,, it is characterized in that being provided with between above-mentioned fiber amplifier (2) and the Polarization Controller (3) gain flattening filter (8) of the flat gain characteristic that is used to improve fiber amplifier (2) according to claim 1 or 2 described variable wavelenght output optic fibre lasers.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021022488A CN1210854C (en) | 2002-01-26 | 2002-01-26 | Variable wavelenght output optic fibre laser |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021022488A CN1210854C (en) | 2002-01-26 | 2002-01-26 | Variable wavelenght output optic fibre laser |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1435922A CN1435922A (en) | 2003-08-13 |
| CN1210854C true CN1210854C (en) | 2005-07-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB021022488A Expired - Lifetime CN1210854C (en) | 2002-01-26 | 2002-01-26 | Variable wavelenght output optic fibre laser |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1295822C (en) * | 2004-06-25 | 2007-01-17 | 南开大学 | Convertible dual-wavelength doping optical fiber laser |
| WO2014067047A1 (en) * | 2012-10-29 | 2014-05-08 | 华为技术有限公司 | Wavelength tunable laser, passive optical network system and device |
| CN104038289A (en) * | 2014-06-07 | 2014-09-10 | 吉林大学 | Optical soliton pulse generator formed by erbium-doped-fiber laser |
| EP2993743B1 (en) * | 2014-09-02 | 2017-05-10 | Huawei Technologies Co., Ltd. | Tunable laser and method for tuning a lasing mode |
| WO2016201650A1 (en) * | 2015-06-17 | 2016-12-22 | 许亮芳 | Polarization-insensitive arrayed waveguide grating module |
| CN109286122B (en) * | 2018-12-13 | 2020-04-28 | 华南理工大学 | Multi-band tunable single-frequency optical fiber laser |
| CN113285756B (en) * | 2021-07-22 | 2021-10-22 | 西安奇芯光电科技有限公司 | PLC chip, single-fiber bidirectional optical assembly, optical module and working method |
| CN114337837B (en) * | 2021-11-26 | 2023-11-14 | 军事科学院系统工程研究院网络信息研究所 | Wavelength programmable multifunctional microwave photon signal processing method |
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2002
- 2002-01-26 CN CNB021022488A patent/CN1210854C/en not_active Expired - Lifetime
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| CN1435922A (en) | 2003-08-13 |
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