CN102394465A - Single longitudinal mode laser device capable of switching wavelengths - Google Patents
Single longitudinal mode laser device capable of switching wavelengths Download PDFInfo
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- CN102394465A CN102394465A CN2011103283884A CN201110328388A CN102394465A CN 102394465 A CN102394465 A CN 102394465A CN 2011103283884 A CN2011103283884 A CN 2011103283884A CN 201110328388 A CN201110328388 A CN 201110328388A CN 102394465 A CN102394465 A CN 102394465A
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Abstract
The invention discloses a single longitudinal mode laser device capable of switching wavelengths. The laser device comprises a 980nm pump laser, a 980nm 3dB first coupler, 980nm/1550nm first wavelength division multiplexer and second wavelength division multiplexer, an electrically controlled optical switch, a group of optical fiber gratings with different center wavelengths, a second coupler, an L-waveband 3dB third coupler, and a monitoring system connected with the second coupler, wherein the pump laser is connected with the first coupler through optical fiber; the first coupler is respectively connected with the first wavelength division multiplexer and the second wavelength division multiplexer through the optical fiber; the two wavelength division multiplexers are connected with each other through EDF (Erbium-Doped Fiber) which is used as a gain medium; the first wavelength division multiplexer is successively connected with the second coupler and the third coupler; the second wavelength division multiplexer is connected with the electrically controlled optical switch through an optical fiber and the electrically controlled optical switch is respectively connected with each optical fiber grating with different center wavelengths.
Description
Technical field
The present invention relates to a kind of laser generation technique, but but single longitudinal mode, the wavelength switch fiber laser device of particularly a kind of wavelength switch, single longitudinal mode output applicable to wdm system.
Background technology
Narrow linewidth, single-longitudinal-mode fiber laser are a kind of high-quality light sources, in optical communication, all have a wide range of applications in spectrum analysis and the light sensing.Along with the development of wavelength division multiplexing (WDM) communication system, the research with single-longitudinal-mode fiber laser of lambda switch function more and more comes into one's own.Present most of fiber laser is based on to be considered longitudinal mode characteristic or a certain individual feature of lambda switch, this big limitations fiber laser in the particularly application in the wdm system of optical communication field.Therefore but proposition is crucial to the fiber laser that narrow linewidth, single longitudinal mode have the wavelength switching function simultaneously.
Summary of the invention
Goal of the invention: technical problem to be solved by this invention is the deficiency to prior art, but a kind of single longitudinal mode, wavelength switch fiber laser device are provided.
In order to solve the problems of the technologies described above; But the invention discloses a kind of single longitudinal mode, wavelength switch fiber laser device, comprise the pump laser of 980nm, 3dB first coupler of 980nm, first wavelength division multiplexer of 980nm/1550nm and fiber grating, second coupler, 3dB the 3rd coupler of L-band and the monitoring system that is connected second coupler of second wavelength division multiplexer, electric control optical switch, one group of different centre wavelength;
Said pump laser connects first coupler through optical fiber; First coupler connects first wavelength division multiplexer and second wavelength division multiplexer through optical fiber respectively; Connect through Er-doped fiber between two wavelength division multiplexers as gain media; Said first wavelength division multiplexer connects second coupler and the 3rd coupler successively, and said second wavelength division multiplexer connects electric control optical switch through optical fiber, and electric control optical switch connects the fiber grating of each different centre wavelengths respectively.
Among the present invention; Said monitoring system is for delaying time from zero balancing wire width measuring system; Comprise the 4th coupler that is connected with second coupler; And 3dB the 5th coupler, photodetector and the electric spectrum analyzer of the L-band that is connected successively with the 4th coupler, wherein be connected through delay line and Polarization Controller respectively between the 4th coupler and the 5th coupler.The 4th coupler of L-band, delay line, Polarization Controller, 3dB the 5th coupler, photodetector and electric spectrum analyzer constitute and are linked in sequence.
Among the present invention, said monitoring system is a spectroanalysis instrument.
Among the present invention, said second coupler is the coupler of L-band 70:30 ~ 95:5.
Among the present invention, said the 4th coupler is the coupler of L-band 90:10.
Among the present invention, the electric control optical switch that the 1550nm port of second wavelength division multiplexer connects has one group of n road break-make, has constituted the lambda switch module of laser together with the fiber grating of said corresponding one group of n different centre wavelength.The 1550nm port of first wavelength division multiplexer connects and connects establish in addition the one section not Er-doped fiber of pumping behind second coupler; Er-doped fiber is as saturated absorbing body; The Sagnac speculum that it and the 3rd coupler constitute has been formed the saturated absorption module of laser, is used for realizing narrow linewidth, the single longitudinal mode running of laser.The 10% output output light signal of second coupler connects spectroanalysis instrument and measures its wavelength information, and is provided with time-delay from the device of zero balancing to the wire width measuring of light path.
The present invention utilizes its saturated absorption effect through in the fiber laser resonant cavity, adding one section saturated absorbing body, realizes narrow linewidth, the single longitudinal mode running of laser; The lambda switch module of utilizing the fiber grating of electric control optical switch and different centre wavelengths to form simultaneously realizes the switching function of output wavelength; Utilize time-delay to measure the live width of output light from zero balancing.
The working mechanism of present embodiment is: the pump power of 980nm pump laser output is divided into equal two parts light path by first coupler of the 3dB of 980nm; First wavelength division multiplexer and second through 980nm/1550nm is coupled into one section Er-doped fiber respectively; Constituted the EDFA amplification module of a two directional pump, for laser resonant cavity provides necessary gain.
The light signal that is exaggerated enters into electric control optical switch; One group of fiber grating with different centre wavelengths is being connected with each port of optical switch is parallel; Use the external control power supply can control the conducting of arbitrary port of optical switch; Optical switch and fiber grating have constituted the lambda switch module of fiber laser, realize the lambda switch function of laser output signal.
After the light signal that is chosen wavelength is amplified by EDFA light amplification module; Second coupler through 90:10 enters into one section not Er-doped fiber of pumping; The Er-doped fiber other end of pumping does not connect the 3rd coupler of 3dB; Two output ports of the 3rd coupler directly link to each other, and have constituted a Sagnac speculum, and it has the characteristic of broadband, high reflectance.
Reverberation and incident light form standing wave in Er-doped fiber; Cause the refractive index in the Er-doped fiber that periodic minor alteration has taken place; Formed dynamic Bragg grating, the Er-doped fiber of adding not pumping has the saturated absorption characteristic, and this dynamic Bragg grating has the narrow linewidth filtering characteristic; The Sagnac speculum that constitutes with the 3rd coupler of the Er-doped fiber of pumping has not been formed the saturated absorption module of laser, and its function is to realize the narrow linewidth of fiber laser, single longitudinal mode running.Final laser is through the 10% port output specific wavelength of second coupler, and the light signal with single longitudinal mode characteristic.The wavelength information of light signal and spectrum information will be provided from homodyne wire width measuring system by spectroanalysis instrument and time-delay.
Beneficial effect: the present invention utilizes the saturated absorption effect of saturated absorbing body to realize the narrow linewidth of output light signal, the characteristic of single longitudinal mode; Utilize the filtering characteristic of switching characteristic and the fiber grating of optical switch to realize the function of output light wavelength switch simultaneously, this technology can be applicable in the design work of light source in the WDM communication system.
Description of drawings
Below in conjunction with accompanying drawing and embodiment the present invention is done specifying further, above-mentioned and/or otherwise advantage of the present invention will become apparent.
Fig. 1 is a structural representation of the present invention.
Fig. 2 is a monitoring system part-structure sketch map of the present invention.
Embodiment
Embodiment
As shown in Figure 1, present embodiment is by 980nm pump laser 1, the three-dB coupler 2 of 980nm; 980nm/1550nm wavelength division multiplexer 31,32, Er-doped fiber 4,1 * n type optical switch 5; Fiber grating 61～6n, 90:10 coupler 7, the Er-doped fiber 8 of not pumping; Three-dB coupler 9, monitoring system 10 is formed.As shown in Figure 2; Monitoring system 10 is to delay time from zero balancing wire width measuring system, in order to the live width of measurement output signals, wherein delays time from zero balancing wire width measuring system by 90:10 coupler 21; Delay line 22; Polarization Controller 23, three-dB coupler 24, photodetector 25 constitutes with electric spectrum analyzer 26.Also can use spectroanalysis instrument as monitoring system.
But the fiber laser of narrow linewidth, single longitudinal mode, wavelength switch is mainly by light amplification, and three modules of optical wavelength switch and saturated absorbing body are formed.Wherein light amplification module adopts the two directional pump mode; 980nm pumping source 1 is divided into equal two-way through three-dB coupler 2 with pump power; Through two 980nm/1550nm wavelength division multiplexers 31,32, get in the Er-doped fiber 4 with flashlight, then for laser resonant cavity provides gain.Wavelength selects module to be made up of with n the fiber grating 61～6n with different centre wavelengths 1 * n type optical switch 5, and n grating is being connected with n port of optical switch is parallel.Use the external control power supply can control the conducting of arbitrary port n of optical switch; Thereby the grating FBG n that links to each other with this port just is chosen for the filter element of laser cavity, and the light that falls within the FBGn reflection bandwidth of wavelength will be allowed in laser vibration to realize laser output because it has less consumption like this.Though Er-doped fiber is the gain HOMOGENEOUS BROADENING MEDIUM, since the existence of effects of spatial, the normally many longitudinal mode outputs of erbium doped fiber laser.In addition; One section not the Er-doped fiber 8 of pumping as saturated absorbing body; Formed the saturated absorption module of laser with a Sagnac speculum with broadband, high reflectance characteristic that is made up of three-dB coupler 9, incident light and reverberation be the relevant standing wave that forms in Er-doped fiber 8.Because the saturated absorption effect of Er-doped fiber, make the minor alteration of the refractive index generating period property in the Er-doped fiber 8, thereby form dynamic arrowband Bragg grating, utilize the narrow linewidth filtering characteristic of dynamic raster to realize the single longitudinal mode running of laser.Utilize saturated absorbing body to the principle that its absorption coefficients of light signal of different optical power densities is inversely proportional to simultaneously, realize that the width of exporting light signal turns usefulness into.
The output signal outputs in the monitoring system via 10% port of 90:10 coupler 7; Monitoring system both can be a spectroanalysis instrument; Being used for detecting the wavelength information of output signal, also can be that time-delay is from zero balancing wire width measuring system, in order to the live width size of measurement output signals frequency spectrum.In zero balancing wire width measuring system; The output signal of laser is input in the 90:10 coupler 21; And be divided into two-way; 90% luminous power will be through one section delay line eliminating the coherence with another road light, after 10% luminous power is regulated polarization states by Polarization Controller 22, enters into three-dB coupler 24 with that road light of 90%.Output to after two-way light superposes therein on the photodetector 25, photodetector 25 will detect the difference frequency signal after the two-way optical superposition.Because two-way light does not have the skew of occurrence frequency in transmission course, the centre frequency of difference frequency signal will be 0Hz, so this method is called delay from zero balancing.Finally, the spectrum analysis of this difference frequency signal will be provided by electric spectrum analyzer 26.
In an embodiment; Comparatively coarse to choosing of fiber grating and optical switch; The switching speed of optical switch directly influences the switching speed of laser output wavelength; The centre wavelength of fiber grating then directly determines the wavelength of laser output signal, according to the requirement of actual communication system, should choose the optical switch of faster; Simultaneously the standard that ITU-T formulates should be satisfied in the interval between the centre wavelength of different fiber grating, and promptly the interval of interchannel frequency should be the wavelength interval that 50GHz or 25GHz are equivalent to 0.4nm and .2nm in wdm system.Delaying time in zero balancing wire width measuring system in addition; The selecting to such an extent that look the live width of actual outgoing signal of length of delay line (i.e. a section single-mould fiber) and deciding; In the present embodiment, the live width of shoot laser signal is about about 3kHz, so the length present embodiment of delay line has been chosen 50km.What two sections Er-doped fiber present embodiments were all selected for use is the EDFC-980-HP C-Band Er-doped fiber of U.S. Nufern company.Polarization Controller of using in the experiment and wavelength division multiplexer all should have less insertion loss.The electricity spectrum analyzer can adopt the E4440A of U.S. Agilent company.
But the invention provides the thinking and the method for a kind of single longitudinal mode, wavelength switch fiber laser device; The method and the approach of concrete this technical scheme of realization are a lot, and the above only is a preferred implementation of the present invention, should be understood that; For those skilled in the art; Under the prerequisite that does not break away from the principle of the invention, can also make some improvement and retouching, these improvement and retouching also should be regarded as protection scope of the present invention.The all available prior art of each part not clear and definite in the present embodiment realizes.
Claims (5)
1. but a single longitudinal mode, wavelength switch fiber laser device; It is characterized in that, comprise the pump laser of 980nm, 3dB first coupler of 980nm, first wavelength division multiplexer of 980nm/1550nm and fiber grating, second coupler, 3dB the 3rd coupler of L-band and the monitoring system that is connected second coupler of second wavelength division multiplexer, electric control optical switch, one group of different centre wavelength;
Two output ports of the 3rd coupler directly connect; Said pump laser connects first coupler through optical fiber; First coupler connects first wavelength division multiplexer and second wavelength division multiplexer through optical fiber respectively; Connect through Er-doped fiber between two wavelength division multiplexers as gain media; Said first wavelength division multiplexer connects second coupler and the 3rd coupler successively, and said second wavelength division multiplexer connects electric control optical switch through optical fiber, and electric control optical switch connects the fiber grating of each different centre wavelengths respectively.
2. but a kind of single longitudinal mode according to claim 1, wavelength switch fiber laser device; It is characterized in that; Said monitoring system is for delaying time from zero balancing wire width measuring system; Comprise the 4th coupler that is connected with second coupler, and 3dB the 5th coupler, photodetector and the electric spectrum analyzer of the L-band that is connected successively with the 4th coupler, wherein be connected through delay line and Polarization Controller respectively between the 4th coupler and the 5th coupler.
3. but a kind of single longitudinal mode according to claim 1, wavelength switch fiber laser device is characterized in that said monitoring system is a spectroanalysis instrument.
4. but a kind of single longitudinal mode according to claim 1, wavelength switch fiber laser device is characterized in that said second coupler is the coupler of L-band 70:30 ~ 95:5.
5. but a kind of single longitudinal mode according to claim 1, wavelength switch fiber laser device is characterized in that said the 4th coupler is the coupler of L-band 90:10.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105896255A (en) * | 2016-06-21 | 2016-08-24 | 上海理工大学 | Adjustable picosecond solid laser system |
| CN105896262A (en) * | 2016-06-21 | 2016-08-24 | 上海理工大学 | Adjustable picosecond optical fibre laser system |
| CN106058621A (en) * | 2016-06-21 | 2016-10-26 | 上海理工大学 | Adjustable picosecond laser |
| CN106602394A (en) * | 2017-01-19 | 2017-04-26 | 吉林大学 | Resonant cavity system formed by dynamic fiber grating and fiber bragg grating |
| CN107045161A (en) * | 2017-03-28 | 2017-08-15 | 南京信息职业技术学院 | Multi-longitudinal-mode fiber laser sensing multiplexing system |
| CN110690640A (en) * | 2018-07-06 | 2020-01-14 | 广东瀚盈激光科技有限公司 | Picosecond optical fiber seed laser source structure |
| CN115967002A (en) * | 2022-11-25 | 2023-04-14 | 山东省科学院激光研究所 | Multi-channel fast selection and tunable single-frequency fiber laser and use method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1410824A (en) * | 2002-11-05 | 2003-04-16 | 浙江大学 | Long wave band erbium mixed amplifier with low noise, high gain and high plain |
| CN101483306A (en) * | 2009-01-20 | 2009-07-15 | 天津大学 | C+L band multiple wavelength optical fiber laser |
| CN101714739A (en) * | 2009-11-20 | 2010-05-26 | 北京交通大学 | Y type cavity all-optical fiber hopping frequency millimeter wave generating device |
| CN202260112U (en) * | 2011-10-26 | 2012-05-30 | 江苏省邮电规划设计院有限责任公司 | Single longitudinal mode wavelength-switchable fiber laser device |
-
2011
- 2011-10-26 CN CN2011103283884A patent/CN102394465A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1410824A (en) * | 2002-11-05 | 2003-04-16 | 浙江大学 | Long wave band erbium mixed amplifier with low noise, high gain and high plain |
| CN101483306A (en) * | 2009-01-20 | 2009-07-15 | 天津大学 | C+L band multiple wavelength optical fiber laser |
| CN101714739A (en) * | 2009-11-20 | 2010-05-26 | 北京交通大学 | Y type cavity all-optical fiber hopping frequency millimeter wave generating device |
| CN202260112U (en) * | 2011-10-26 | 2012-05-30 | 江苏省邮电规划设计院有限责任公司 | Single longitudinal mode wavelength-switchable fiber laser device |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105896255A (en) * | 2016-06-21 | 2016-08-24 | 上海理工大学 | Adjustable picosecond solid laser system |
| CN105896262A (en) * | 2016-06-21 | 2016-08-24 | 上海理工大学 | Adjustable picosecond optical fibre laser system |
| CN106058621A (en) * | 2016-06-21 | 2016-10-26 | 上海理工大学 | Adjustable picosecond laser |
| CN106602394A (en) * | 2017-01-19 | 2017-04-26 | 吉林大学 | Resonant cavity system formed by dynamic fiber grating and fiber bragg grating |
| CN106602394B (en) * | 2017-01-19 | 2019-02-12 | 吉林大学 | A kind of resonance cavity system of Dynamic Optical Fiber grating and optical fiber Bragg raster composition |
| CN107045161A (en) * | 2017-03-28 | 2017-08-15 | 南京信息职业技术学院 | Multi-longitudinal-mode fiber laser sensing multiplexing system |
| CN107045161B (en) * | 2017-03-28 | 2023-11-28 | 南京信息职业技术学院 | Multi-longitudinal-mode fiber laser sensing multiplexing system |
| CN110690640A (en) * | 2018-07-06 | 2020-01-14 | 广东瀚盈激光科技有限公司 | Picosecond optical fiber seed laser source structure |
| CN115967002A (en) * | 2022-11-25 | 2023-04-14 | 山东省科学院激光研究所 | Multi-channel fast selection and tunable single-frequency fiber laser and use method |
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Application publication date: 20120328 |