CN102324685A - Multi-wavelength erbium-doped optical fiber laser based on parallel non-linear polarization rotation structure - Google Patents
Multi-wavelength erbium-doped optical fiber laser based on parallel non-linear polarization rotation structure Download PDFInfo
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- CN102324685A CN102324685A CN 201110254511 CN201110254511A CN102324685A CN 102324685 A CN102324685 A CN 102324685A CN 201110254511 CN201110254511 CN 201110254511 CN 201110254511 A CN201110254511 A CN 201110254511A CN 102324685 A CN102324685 A CN 102324685A
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Abstract
The invention relates to a multi-wavelength erbium-doped optical fiber laser based on a parallel non-linear polarization rotation structure, which comprises a pump source, a wavelength-division multiplexer, a erbium-doped optical fiber, a polarization dependent isolator, a first optical coupler, a first polarization controller, a second optical coupler, a second polarization controller, an ordinary single-mode optical fiber and a polarization-maintaining optical fiber; and the structure is based on polarization rotation effect, the polarization controller in a parallel structure is adopted to form the non-linear polarization rotation structure, so that a multi-wavelength narrow-line width optical fiber laser is realized. Compared with other erbium-doped optical fiber lasers, the structure with non-linear polarization rotation effect inhibits mode competition caused by the homogeneous broadening effect of the erbium-doped optical fiber, so that the multi-wavelength laser output is stable; and the multi-wavelength erbium-doped optical fiber laser based on the parallel non-linear polarization rotation structure is in the parallel structure, so that twice of polarized rotation occurs every time when an optical signal runs in a resonator, the utilization rate of the pump source is improved, the quantity and the power of output laser are increased, and the multi-wavelength erbium-doped optical fiber laser based on the parallel non-linear polarization rotation structure has the advantages of compact structure, low cost, stability in work at room temperature and the like.
Description
Technical field
The invention belongs to high speed optical fiber communication and laser technology field, be specifically related to a kind of design of Multiwavelength Erbium-doped Fiber Laser.
Background technology
Multi-wavelength optical fiber laser is the focus of current wavelength division multiplexing high-speed communication system area research.At present, in wavelength division multiplexed network, generally adopt semiconductor distributed feedback laser as light source.Yet each wavelength division multiplexing branch road needs a stable distributed feedback laser light source, and the complexity that this has caused system has increased the cost of system, and can't satisfy the requirement of stability.In small-scale wavelength division multiplexed network, (be generally less than 10 branch roads), the cost and the complexity that reduce light source seem particularly important.Therefore, multiple-wavelength laser has increased the economic benefit of wavelength-division multiplex technique.
Multiwavelength Erbium-doped Fiber Laser is low with compact conformation, cost, compatible with optical communication network, advantage such as steady operation and become the research focus at room temperature.The technological means of realization Multiwavelength Erbium-doped Fiber Laser has a variety of, but the output wavelength number is limited mostly, and is difficult to keep stability.The relevant non-homogeneous loss of the intensity that nonlinear polarization rotation is induced can suppress the mode competition in the Er-doped fiber effectively, thereby makes fiber laser at room temperature produce stable multi-wavelength output and received researcher's favor.The structure of the nonlinear polarization rotation that at present domestic and international researcher is applied to is serial structure; Promptly utilize two Polarization Controllers to place polarizer both sides respectively; Form loop laser resonance cavity, make light signal that the rotation of a polarization state only take place when in the chamber, turning round, this serial structure has only the process of a polarization state rotation in each circulation of light signal; Make pump light produce the intensity dependent loss; Very most light signal all is depleted, and does not contribute to producing laser, and the pumping transformation efficiency is low.
Summary of the invention
The objective of the invention is to solve the available technology adopting serial structure exists the output wavelength number limited and be difficult to keep the problem of stability; A kind of Multiwavelength Erbium-doped Fiber Laser based on parallel nonlinear polarization rotational structure is provided, realizes the novel erbium doped fiber laser of low cost, compact conformation, narrow linewidth, multi-wavelength.Adopt this parallel organization; The polarization rotation takes place in two-way simultaneously up and down; And be present in the monomode fiber through coupler coupling back quadrature; Independently carry out polarization state rotation, the light of last special polarization state can be through the relevant isolator of polarization, the inhibition of the mode competition that has realized the even broadening of Er-doped fiber is produced.When pumping source excitation endlessly, constantly resonance amplifies and the polarization rotation, thereby realizes the output multiwavelength laser.
Multiwavelength Erbium-doped Fiber Laser based on parallel nonlinear polarization rotational structure provided by the invention comprises:
Pumping source, wavelength division multiplexer, Er-doped fiber, the relevant isolator of polarization, first optical coupler, first Polarization Controller, second optical coupler, second Polarization Controller, general single mode fiber and polarization maintaining optical fibre;
First port of pumping source output termination wavelength division multiplexer; The 3rd port of wavelength division multiplexer connects the input of Er-doped fiber; The input of the relevant isolator of the output termination polarization of Er-doped fiber; First port of output termination first optical coupler of the relevant isolator of polarization; Second port of first optical coupler links to each other with first Polarization Controller, and the other end of first Polarization Controller links to each other with first port of second optical coupler; The 3rd port of first optical coupler links to each other with second Polarization Controller, and the other end of second Polarization Controller links to each other with second port of second optical coupler; The 3rd port of second optical coupler is as the output port of laser; The 4th port of second optical coupler is connected with one section general single mode fiber; The other end of general single mode fiber links to each other with polarization maintaining optical fibre; The another port of polarization maintaining optical fibre is inserted second port of wavelength division multiplexer again.
The length of described polarization maintaining optical fibre is 10 meters ~ 50 meters, is used to increase the nonlinear polarization rotation effect of system; The length 2km of general single mode fiber ~ 5Km is used to increase nonlinear effect.
Advantage of the present invention and beneficial effect:
The present invention makes light signal every operation in resonant cavity once twice polarization state rotation will take place, thereby realizes the output of multiwavelength laser signal through using parallel nonlinear polarization rotational structure; An optical coupler, the linearly polarized light that the relevant isolator of polarization is come out is divided into two-way up and down, and two-way light is respectively through the Polarization Controller modulation; Close the light that has two kinds of polarization states behind the road in the system; Through the relevant isolator of polarization, spectrum is carried out shaping operation again, had only the high part of spectral centroid intensity can pass through the relevant isolator of polarization; The edge portions of the spectrum can be absorbed, thereby plays the narrow linewidth effect of pressing.The light of the relevant isolator output of polarization gets into optical coupler again, and the rotation of polarization state takes place under the effect of Polarization Controller branch road under upward the light of branch road gets in circulation next time in the preceding once circulation; Equally, the light of branch road gets into branch road, the rotation of generation polarization state under the effect of Polarization Controller under in the preceding once circulation in circulation next time; So, light moves in ring and just is equivalent to pass through twice polarization rotation a week, has improved the transformation efficiency of pump light, has increased the output number of laser wavelength.
The introducing of the relevant isolator of polarization; Not only played the effect of the isolator and the polarizer; And move in the chamber through the light after the polarization state rotation when getting back to polarization a week once more and being correlated with isolator, the edge portions of the spectrum can be absorbed, and plays the effect of pressure narrow linewidth.
This invention has realized that output wavelength quantity is many, cost is lower, the Multiwavelength Erbium-doped Fiber Laser of steady operation under the compact conformation, room temperature.
Description of drawings
Among the figure: 1 pumping source, 2 wavelength division multiplexers, 3 Er-doped fibers, the relevant isolator of 4 polarizations, 5 first optical couplers, 6 first Polarization Controllers, 7 second optical couplers, 8 second Polarization Controllers, 9 general single mode fibers, 10 polarization maintaining optical fibres.
Below in conjunction with accompanying drawing the present invention is further specified.
Embodiment
As shown in the figure, the Multiwavelength Erbium-doped Fiber Laser based on parallel nonlinear polarization rotational structure provided by the invention comprises:
1 pumping source, 2 wavelength division multiplexers, 3 Er-doped fibers, the relevant isolator of 4 polarizations, 5 first optical couplers, 6 first Polarization Controllers, 7 second optical couplers, 8 second Polarization Controllers, 9 general single mode fibers, 10 polarization maintaining optical fibres.
The first port a of pumping source 1 output termination wavelength division multiplexer 2; The 3rd port c of wavelength division multiplexer 2 connects the input of Er-doped fiber 3; The input of the relevant isolator 4 of the output termination polarization of Er-doped fiber 3; The first port a of output termination first optical coupler 5 of the relevant isolator 4 of polarization; The second port b of first optical coupler 5 links to each other with first Polarization Controller 6, and the other end of first Polarization Controller 6 links to each other with the first port a of second optical coupler 7; The 3rd port c of first optical coupler 5 links to each other with second Polarization Controller 28, and the other end of second Polarization Controller 8 links to each other with the second port b of second optical coupler 7; The 3rd port c of second optical coupler 7 is as the output port of laser; The 4th port d of second optical coupler 7 is connected with the general single mode fiber 9 of one section 5km; The other end of general single mode fiber 9 links to each other with polarization maintaining optical fibre 10; The another port of polarization maintaining optical fibre 10 is inserted the second port b of wavelength division multiplexer 2 again.
Operation principle and process
As shown in the figure; Pump light injects Er-doped fiber 3 through the 3rd port c of wavelength division multiplexer 2 and has obtained gain; After getting into the relevant isolator 4 of polarization, become linearly polarized light, and then the linearly polarized light of the relevant isolator of polarization being come by 1 * 2 first optical coupler 5 is divided into two-way up and down, tuning through first Polarization Controller 6 and second Polarization Controller 8 respectively; Change its polarization state; Be coupled to together through 2 * 2 second optical couplers 7, the 3rd port c of second optical coupler 7 receives spectrometer as the output port of laser again, detects output laser.Tuning first Polarization Controller 6 and second Polarization Controller 8; Make that two-way light has different polarization states respectively up and down; Close the light that has two kinds of polarization states behind the road in the system, through the relevant isolator 4 of polarization, spectrum has been carried out shaping operation again; Have only the high part of spectral centroid intensity to pass through, spectral edges is stopped.Because the parallel respectively two-way up and down that is positioned at of first Polarization Controller 6 and second Polarization Controller 8; This just makes light every circulation primary in light path; With regard to having carried out " first Polarization Controller, 6-polarization be correlated with isolator 4-the second Polarization Controller 8 " and " relevant isolator 4-the first Polarization Controller 6 of second Polarization Controller, 8-polarization " twice polarization turning effort simultaneously, improved wavelength conversion efficiency effectively.
The relevant isolator 4 of polarization is as the Primary Component of this structure; Not only played the effect of the isolator and the polarizer, made the unidirectional running of light path and change natural daylight into linearly polarized light, and moved in the chamber through the light signal after the polarization state rotation when getting back to polarization a week once more and being correlated with isolator 4; The edge part branch of light signal is absorbed; This process constantly repeats, and makes spectral width constantly narrow down, so the relevant isolator 4 of polarization has also played the space filtering effect.
For the polarization rotation effect of enhanced system, introduced the polarization maintaining optical fibre 10 of 10m in the system.Linearly polarized light can keep its linear polarization state along two main shaft incidents in polarization maintaining optical fibre 10, thereby changes the birefringence intensity in the chamber; On the other hand, filter difficult to understand in the polarization maintaining optical fibre 10 and first Polarization Controller 6 and second Polarization Controller 8 have constituted can be accomplished further filter action, has guaranteed the stability of system.
The introducing of the general single mode fiber 9 of 5km is in order to satisfy nonlinear effect to take place fully in the light path.This structure has realized the stable simultaneously output of 22 wavelength, and power output is up to 8.5dBm, and wavelength such as approaches at amplitude output.The number of output wavelength receives the restriction of Er-doped fiber 3 gain bandwidths and the restriction of pump power.In theory, use the doped fiber (like the high Er-doped fiber of LIEKKI, gain bandwidth is greater than 1000nm) of wideer gain ranging instead, and the pumping source of high pumping power (greater than 300mW), just can reach the more wavelength output of more number.
Claims (2)
1. the Multiwavelength Erbium-doped Fiber Laser based on parallel nonlinear polarization rotational structure is characterized in that this laser comprises: pumping source, wavelength division multiplexer, Er-doped fiber, the relevant isolator of polarization, first optical coupler, first Polarization Controller, second optical coupler, second Polarization Controller, general single mode fiber and polarization maintaining optical fibre;
First port of pumping source output termination wavelength division multiplexer; The 3rd port of wavelength division multiplexer connects the input of Er-doped fiber; The input of the relevant isolator of the output termination polarization of Er-doped fiber; First port of output termination first optical coupler of the relevant isolator of polarization; Second port of first optical coupler links to each other with first Polarization Controller, and the other end of first Polarization Controller links to each other with first port of second optical coupler; The 3rd port of first optical coupler links to each other with second Polarization Controller, and the other end of second Polarization Controller links to each other with second port of second optical coupler; The 3rd port of second optical coupler is as the output port of laser; The 4th port of second optical coupler is connected with one section general single mode fiber; The other end of general single mode fiber links to each other with polarization maintaining optical fibre; The another port of polarization maintaining optical fibre is inserted second port of wavelength division multiplexer again.
2. the Multiwavelength Erbium-doped Fiber Laser based on parallel nonlinear polarization rotational structure according to claim 1, it is characterized in that: the length of described polarization maintaining optical fibre is 10 meters ~ 50 meters, is used to combine Polarization Controller to be formed on line filter; The length 2km of general single mode fiber ~ 5km is used to increase nonlinear effect.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104752943A (en) * | 2015-04-27 | 2015-07-01 | 天津理工大学 | Interference structure-based dual-wavelength fiber laser |
| CN105703211A (en) * | 2016-04-20 | 2016-06-22 | 北京信息科技大学 | Mach-Zehnder filtering structure based tunable fiber laser |
| CN106785897A (en) * | 2017-02-15 | 2017-05-31 | 西南大学 | Polarization output conversion device based on long wavelength's spin VCSEL |
| CN107895881A (en) * | 2017-10-20 | 2018-04-10 | 上海理工大学 | The fine nonlinear polarization rotation mode-locked laser of full polarization |
| CN109586149A (en) * | 2019-01-22 | 2019-04-05 | 北京交通大学 | A kind of changeable multiple-wavelength laser that all -fiber wavelength interval is variable |
| CN110970790A (en) * | 2019-12-25 | 2020-04-07 | 季华实验室 | Femtosecond laser |
| CN113572003A (en) * | 2021-07-05 | 2021-10-29 | 杭州电子科技大学 | Channel interval tunable multi-wavelength fiber laser based on double Sagnac rings |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104752943A (en) * | 2015-04-27 | 2015-07-01 | 天津理工大学 | Interference structure-based dual-wavelength fiber laser |
| CN105703211A (en) * | 2016-04-20 | 2016-06-22 | 北京信息科技大学 | Mach-Zehnder filtering structure based tunable fiber laser |
| CN106785897A (en) * | 2017-02-15 | 2017-05-31 | 西南大学 | Polarization output conversion device based on long wavelength's spin VCSEL |
| CN106785897B (en) * | 2017-02-15 | 2023-03-24 | 西南大学 | Polarization output conversion device based on long wavelength spin VCSEL |
| CN107895881A (en) * | 2017-10-20 | 2018-04-10 | 上海理工大学 | The fine nonlinear polarization rotation mode-locked laser of full polarization |
| CN107895881B (en) * | 2017-10-20 | 2019-08-30 | 上海理工大学 | The nonlinear polarization rotation mode-locked laser of full polarization fibre |
| CN109586149A (en) * | 2019-01-22 | 2019-04-05 | 北京交通大学 | A kind of changeable multiple-wavelength laser that all -fiber wavelength interval is variable |
| CN110970790A (en) * | 2019-12-25 | 2020-04-07 | 季华实验室 | Femtosecond laser |
| CN113572003A (en) * | 2021-07-05 | 2021-10-29 | 杭州电子科技大学 | Channel interval tunable multi-wavelength fiber laser based on double Sagnac rings |
| CN113572003B (en) * | 2021-07-05 | 2022-04-29 | 杭州电子科技大学 | Channel interval tunable multi-wavelength fiber laser based on double Sagnac rings |
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Application publication date: 20120118 |