CN104143757A - Wavelength tunable narrow linewidth light source based on DBR laser - Google Patents
Wavelength tunable narrow linewidth light source based on DBR laser Download PDFInfo
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- CN104143757A CN104143757A CN201410386617.1A CN201410386617A CN104143757A CN 104143757 A CN104143757 A CN 104143757A CN 201410386617 A CN201410386617 A CN 201410386617A CN 104143757 A CN104143757 A CN 104143757A
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Abstract
The invention discloses a wavelength tunable narrow linewidth light source based on a DBR laser. According to the light source, light lased by the monolithic integrated DBR semiconductor laser serves as seed light; self-injection feedback is carried out on the DBR laser through two external parallel fiber loops of different lengths to achieve compression of linewidth; finally, the narrow linewidth light source can achieve the output wavelength tunable performance by fully utilizing the wavelength tunable characteristic of the DBR laser.
Description
Technical field
The present invention relates to field of semiconductor photoelectron technique, particularly relate to a kind of tunable wave length narrow linewidth light source based on distributed Bragg reflection laser.
Background technology
Dense wave division multipurpose (Dense wavelength division multiplexing, DWDM) large-scale application of optical fiber telecommunications system, industry is increased gradually to the demand of tunable laser, here " adjustable " refers to that laser can single mode operation, and excitation wavelength can regulate within the specific limits by outside control.And in recent years, Networks of Fiber Communications just becomes increasingly abundant, applies direction fast development further flexibly towards capacity rapid growth, business: in optical-fiber network networking aspect, development has dynamically, the optical-fiber network of reconfigurable function becomes main flow gradually; At optical transport layer face, the relevant rise that detects (Coherent detection) technology makes optical communication network better a record again and again at aspects such as transmission rate, transmission capacity and transmission ranges especially.Be accompanied by this trend, the fiber optic communication field that acts on of narrow line width regulatable laser manifests day by day.And at sensory field of optic fibre, the narrow linewidth laser of tunable wave length has a wide range of applications equally.First a lot of transducers need laser light source to possess the ability of continuous tuning on a large scale; In addition, the live width of laser is narrower, and coherence length is longer, can realize the Detection of Weak Signals of superhigh precision, overlength distance by coherent detection technology.Therefore,, along with the large-scale application of coherent detection technology in optical fiber communication and sensory field of optic fibre, the demand sharp increase of market to tunable narrow linewidth laser, is also carrying out in high gear to the project study of different tunable narrow linewidths.
The typical scenario that realizes narrow linewidth output is to adopt outer-cavity structure prolongation equivalent cavity long, improves the Q value of cavity, thereby realizes the output of high-quality narrow-linewidth laser.Outside cavity gas laser based on grating type optical fiber is a kind of common narrow linewidth structure, it have advantages of simple in structure, stability is high and live width extremely narrow (tens kHz magnitudes).But the wavelength of this laser is because the grating cycle is fixed, and wavelength is generally non-adjustable, and this has limited its application to a certain extent.Another common outside cavity gas laser is the narrow linewidth laser based on MEMS+ body grating technology, in this laser, mirror surface is generally MEMS speculum, can be by the beam reflection of different wave length after grating beam splitting to chip gain by rotating different angles, thus realize the tunability of wavelength.But its Drive Structure more complicated of such narrow linewidth laser, product price is also relatively high.
As a kind of important tunable laser, the manufacture craft of distributed Blatt reflective (Distributed Bragg reflector, DBR) laser and be applied in recent two decades and obtained ripe development.The simplest DBR type tunable laser is made up of three parts: active area, and phase region and grating region, there is electric injecting electrode in Ge district.By to active area Injection Current control power output, thereby and the refractive index of utilizing plasma effect to change material in phase region and grating region realizes separately controlling of luminous power and excitation wavelength.DBR laser is because the mode that adopts electric induced refractive index to change is carried out wavelength tuning, and switch speed is very fast, is very suitable for the such dynamic application of reconfigurable optical network.But the live width of DBR laser, mostly in MHz magnitude, can't meet the application of coherent optical communication completely.
Therefore, at tunable optical source domain, there is the very potential scheme of one, that is exactly to propose a kind of narrow linewidth laser based on DBR laser, the live width of DBR laser is compressed, finally realized a kind of narrow linewidth light source of tunable wave length of simple in structure, stable performance in conjunction with the wavelength tuning ability of DBR laser.
Summary of the invention
(1) technical problem that will solve
Technical problem to be solved by this invention is to provide a kind of narrow linewidth light based on distributed Bragg reflection laser and rises, thereby make full use of the wavelength tuning characteristic of DBR laser, carry out live width compression simultaneously, realize a kind of tunable wave length narrow linewidth light source simple in structure.
(2) technical scheme
In order to address the above problem, the invention provides a kind of tunable wave length narrow linewidth light source based on distributed Bragg reflection laser, this tunable wave length narrow linewidth light source comprises:
DBR laser 101, is used to this tunable wave length narrow linewidth light source that seed light source is provided, and its wavelength tuning range has determined the wavelength tuning range of this tunable wave length narrow linewidth light source;
The first optical coupler 102, is coupled into follow-up optical isolator 103 for DBR laser 101 being swashed to the part optical signals output of penetrating;
Optical isolator 103, for ensureing the one-way transmission of light path, by the optical signal transmission that is received from the first optical coupler 102 to optical attenuator 104;
Optical attenuator 104, for regulating the luminous power of fiber optic loop, thereby control self feed back inject intensity, and by be received from optical isolator 103 optical signal transmission give the second optical coupler 105;
The second optical coupler 105, is divided into two bundles by the light signal that is received from optical attenuator 104, is then transferred to respectively in the first monomode fiber 106 and the second monomode fiber 108;
The first monomode fiber 106, for regulating the Q value (Quality factor) of optical fiber loop, improve Q value in chamber by the length that extends feedback control loop, realize the compression of live width, and the light beam signal that is received from the second optical coupler 105 is transferred to the first Polarization Controller 107;
The first Polarization Controller 107, for regulating the polarization state of the light signal that is received from the first monomode fiber 106, and is transferred to the 3rd optical coupler 110;
The second monomode fiber 108, is used to form another oscillating loop, realizes the Free Spectral Range different from last optical fiber loop, and the light beam signal that is received from the second optical coupler 105 is transferred to the second Polarization Controller 109;
The second Polarization Controller 109, for regulating the polarization state of the light signal that is received from the second monomode fiber 108, and is transferred to the 3rd optical coupler 110;
The 3rd optical coupler 110, for by being optically coupled in together of two fiber optic loop, finally injects DBR laser 101, realizes the compression of live width; And
Light output 111, for the last output of this tunable wave length narrow linewidth light source, for exporting light.
In such scheme, described DBR laser 101 provides seed light for the output of whole loop and light source, the DBR laser that the tuning range that is two-part or syllogic is 10nm, or the tuning range sampled-grating distributed Bragg reflection laser that is 40nm.
In such scheme, described DBR laser 101, the first optical coupler 102, optical isolator 103, optical attenuator 104, the second optical coupler 105, the first monomode fiber 106, the first Polarization Controller 107 and the 3rd optical coupler 110 form the first optical fiber loop, described DBR laser 101, the first optical coupler 102, optical isolator 103, optical attenuator 104, the second optical coupler 105, the second monomode fiber 108, the second Polarization Controller 109 and the 3rd optical coupler 110 form the second optical fiber loop, these two optical fiber loops have different fiber lengths, to utilize the excitation mode in vernier caliper effect elimination annular chamber.
In such scheme, described optical attenuator 104 is for regulating the gross power of these two optical fiber loops, thus the intensity that control self feed back is injected.
(3) beneficial effect
Tunable wave length narrow linewidth light source based on distributed Bragg reflection laser provided by the invention, by single chip integrated distributed Bragg reflection laser (Distributed Bragg Reflector Laser, be called for short DBR laser) swash the light of penetrating as seed light, by outside two arranged side by side, the fiber optic loop of different length, DBR laser is carried out realizing from pouring-in feedback to the compression of live width; The tunable wave length characteristic that finally makes full use of DBR laser realizes the tunable narrow linewidth light source of a kind of output wavelength.
Brief description of the drawings
Fig. 1 is the structural representation according to the tunable wave length narrow linewidth light source based on distributed Bragg reflection laser of the embodiment of the present invention;
Fig. 2 is the schematic diagram that according to the use circulator of the embodiment of the present invention, distributed Bragg reflection laser is carried out the tunable narrow linewidth light source of self-injection locking;
Fig. 3 is the model experiment result comparison diagram that compresses front and back according to the tunable narrow linewidth light source of the embodiment of the present invention in live width.
Embodiment
For make the object, technical solutions and advantages of the present invention more clear bright from, below in conjunction with specific embodiment, and with reference to accompanying drawing, the present invention is described in more detail.
With reference to Fig. 1, Fig. 1 shows the structural representation according to the tunable wave length narrow linewidth light source based on distributed Bragg reflection laser of the embodiment of the present invention, this tunable wave length narrow linewidth light source comprises: DBR laser (DBR Laser) 101, the first optical coupler (OC1) 102, optical isolator 103, optical attenuator (VOA) 104, the second optical coupler (OC2) 105, the first monomode fiber (SMF) 106, the first Polarization Controller (PC) 107, the second monomode fiber (SFM) 108, the second Polarization Controller (PC) 109, the 3rd optical coupler (OC3) 110 and light output (Output) 111, wherein:
DBR laser 101, is used to this tunable wave length narrow linewidth light source that seed light source is provided, and its wavelength tuning range has determined the wavelength tuning range of this tunable wave length narrow linewidth light source;
The first optical coupler 102, is coupled into follow-up optical isolator 103 for DBR laser 101 being swashed to the part optical signals output of penetrating;
Optical isolator 103, for ensureing the one-way transmission of light path, by the optical signal transmission that is received from the first optical coupler 102 to optical attenuator 104;
Optical attenuator 104, for regulating the luminous power of fiber optic loop, thereby control self feed back inject intensity, and by be received from optical isolator 103 optical signal transmission give the second optical coupler 105;
The second optical coupler 105, is divided into two bundles by the light signal that is received from optical attenuator 104, is then transferred to respectively in the first monomode fiber 106 and the second monomode fiber 108;
The first monomode fiber 106, for regulating the Q value (Quality factor) of optical fiber loop, improve Q value in chamber by the length that extends feedback control loop, realize the compression of live width, and the light beam signal that is received from the second optical coupler 105 is transferred to the first Polarization Controller 107;
The first Polarization Controller 107, for regulating the polarization state of the light signal that is received from the first monomode fiber 106, and is transferred to the 3rd optical coupler 110;
The second monomode fiber 108, is used to form another oscillating loop, realizes the Free Spectral Range different from last optical fiber loop, and the light beam signal that is received from the second optical coupler 105 is transferred to the second Polarization Controller 109;
The second Polarization Controller 109, for regulating the polarization state of the light signal that is received from the second monomode fiber 108, and is transferred to the 3rd optical coupler 110;
The 3rd optical coupler 110, for by being optically coupled in together of two fiber optic loop, finally injects DBR laser 101, realizes the compression of live width;
Light output 111, for the last output of this tunable wave length narrow linewidth light source, for exporting light.
Wherein, DBR laser 101 provides seed light for the output of whole loop and light source, and it can be two-part, syllogic DBR laser, and its tuning range is in 10nm left and right; Also can be that tuning range is sampled-grating distributed Bragg reflection (Sampled Grating Distributed Bragg Reflector the is called for short SGDBR) laser of 40nm left and right.
DBR laser (DBR Laser) 101, the first optical coupler (OC1) 102, optical isolator 103, optical attenuator (VOA) 104, the second optical coupler (OC2) 105, the first monomode fiber (SMF) 106, the first Polarization Controller (PC) 107 and the 3rd optical coupler (OC3) 110 form the first optical fiber loop, DBR laser (DBR Laser) 101, the first optical coupler (OC1) 102, optical isolator 103, optical attenuator (VOA) 104, the second optical coupler (OC2) 105, the second monomode fiber (SFM) 108, the second Polarization Controller (PC) 109 and the 3rd optical coupler (OC3) 110 form the second optical fiber loop, these two optical fiber loops have different fiber lengths, its objective is the excitation mode utilizing in vernier caliper effect elimination annular chamber.
Optical attenuator 104 is for regulating the gross power of these two optical fiber loops, thus the intensity that control self feed back is injected.
Referring to Fig. 2, Fig. 2 is the schematic diagram that according to the use circulator of the embodiment of the present invention, distributed Bragg reflection laser is carried out the tunable narrow linewidth light source of self-injection locking, wherein,
DBR Laser is for providing seed light to tunable wave length narrow linewidth light source, and its wavelength tuning range has determined the wavelength tuning range of this tunable wave length narrow linewidth light source.Object of the present invention is exactly that the live width of DBR Laser is compressed.
SMF1 is monomode fiber, and its length can regulate (3m～100m), and its position also can regulate, such as it being placed on to PC1 in fiber optic loop and the centre of OC3.
Cir is optical circulator, and the one-way transmission that it has ensured signal, has played the effect of isolator.Incident light to feedback loop is injected in DBR laser by 2 ports after the 1 port incident of Cir, and DBR laser is injected into after locking, is exported by 3 ports, enters coupler OC1.
OC1 is optical coupler, and it is exported 90% of light by DBR and is injected in feedback loop, 10% exporting through output port in addition.In order to increase coupled power, this circulator can be changed to 5: 5, like this can be using the light of DBR laser 50% as output.
VOA is optical attenuator, and it injects thereby control the intensity of feeding back for regulating the luminous power of feedback loop certainly.
OC2 is optical coupler, and it will be divided into two bundles from attenuator light out, is then input to respectively in two fiber optic loop.In two feedback loops, one of them is by certainly injecting Linewidth, and another one is that its principle can be regarded as by the feedback cavity of two different lengths, realizes a kind of filter function of light in order to remove the excitation mode in annular chamber.
PC1 is Polarization Controller, for regulating the polarization state of this light path.
PC2 is also Polarization Controller, for regulating the polarization state of another light path.
SMF2 is the monomode fiber of 30m, and its length can regulate (8m～100m), its objective is in order to realize the different annular length of a kind of and last light path.
OC3 is the optical coupler of 5: 5, and it is injected into DBR laser by being optically coupled in together in two fiber optic loop by 1 port of Cir, realizes the compression of live width.
Output is the output of narrow linewidth light source.
Through above flow process, DBR laser forms positive feedback via external annular chamber, finally becomes a kind of light source of live width compression.
Referring to Fig. 3, it is the model experiment result in embodiment.DBR laser is before live width compression, and Lorentz live width is 12.5MHz, as shown in left figure; Through certainly injecting after feedback, Lorentz live width is compressed to 3.2kHz, as shown at right.
Above a kind of tunable wave length narrow linewidth light source based on distributed Bragg reflection laser provided by the present invention is described in detail, applied specific case herein principle of the present invention, implementation method and experimental result are set forth, the explanation of above embodiment is just for helping to understand method of the present invention and core concept thereof; Simultaneously; for one of ordinary skill in the art; according to thought of the present invention; all will change in specific embodiments and applications, institute it should be understood that and the foregoing is only specific embodiments of the invention; be not limited to the present invention; within the spirit and principles in the present invention all, any amendment of making, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (4)
1. the tunable wave length narrow linewidth light source based on distributed Bragg reflection laser, is characterized in that, this tunable wave length narrow linewidth light source comprises:
DBR laser (101), is used to this tunable wave length narrow linewidth light source that seed light source is provided, and its wavelength tuning range has determined the wavelength tuning range of this tunable wave length narrow linewidth light source;
The first optical coupler (102), is coupled into follow-up optical isolator (103) for DBR laser (101) is swashed to the part optical signals of penetrating;
Optical isolator (103), for ensureing the one-way transmission of light path, will be received from the optical signal transmission of the first optical coupler (102) to optical attenuator (104);
Optical attenuator (104), for regulating the luminous power of fiber optic loop, thereby controls the intensity that self feed back is injected, and the optical signal transmission that will be received from optical isolator (103) is to the second optical coupler (105);
The second optical coupler (105), is divided into two bundles by the light signal that is received from optical attenuator (104), is then transferred to respectively in the first monomode fiber (106) and the second monomode fiber (108);
The first monomode fiber (106), for regulating the Q value (Quality factor) of optical fiber loop, improve Q value in chamber by the length that extends feedback control loop, realize the compression of live width, and the light beam signal that is received from the second optical coupler (105) is transferred to the first Polarization Controller (107);
The first Polarization Controller (107), for regulating the polarization state of the light signal that is received from the first monomode fiber (106), and is transferred to the 3rd optical coupler (110);
The second monomode fiber (108), be used to form another oscillating loop, realize the Free Spectral Range different from last optical fiber loop, and the light beam signal that is received from the second optical coupler (105) is transferred to the second Polarization Controller (109);
The second Polarization Controller (109), for regulating the polarization state of the light signal that is received from the second monomode fiber (108), and is transferred to the 3rd optical coupler (110);
The 3rd optical coupler (110), for by being optically coupled in together of two fiber optic loop, finally injects DBR laser (101), realizes the compression of live width; And
Light output (111), for the last output of this tunable wave length narrow linewidth light source, for exporting light.
2. the tunable wave length narrow linewidth light source based on distributed Bragg reflection laser according to claim 1, it is characterized in that, described DBR laser (101) provides seed light for the output of whole loop and light source, the DBR laser that the tuning range that is two-part or syllogic is 10nm, or the tuning range sampled-grating distributed Bragg reflection laser that is 40nm.
3. the tunable wave length narrow linewidth light source based on distributed Bragg reflection laser according to claim 1, it is characterized in that, described DBR laser (101), the first optical coupler (102), optical isolator (103), optical attenuator (104), the second optical coupler (105), the first monomode fiber (106), the first Polarization Controller (107) and the 3rd optical coupler (110) form the first optical fiber loop, described DBR laser (101), the first optical coupler (102), optical isolator (103), optical attenuator (104), the second optical coupler (105), the second monomode fiber (108), the second Polarization Controller (109) and the 3rd optical coupler (110) form the second optical fiber loop, these two optical fiber loops have different fiber lengths, to utilize the excitation mode in vernier caliper effect elimination annular chamber.
4. the tunable wave length narrow linewidth light source based on distributed Bragg reflection laser according to claim 3, it is characterized in that, described optical attenuator (104) is for regulating the gross power of these two optical fiber loops, thus the intensity that control self feed back is injected.
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Cited By (7)
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| CN106129806A (en) * | 2016-08-29 | 2016-11-16 | 中国科学院半导体研究所 | Based on external cavity type narrow linewidth Distributed Bragg Reflection semiconductor laser |
| CN106684704A (en) * | 2017-03-29 | 2017-05-17 | 重庆大学 | Ultra-narrow line-width laser device |
| CN106921440A (en) * | 2015-12-28 | 2017-07-04 | 上海贝尔股份有限公司 | A kind of inexpensive light adjustable transmitter for optical network unit |
| CN107181166A (en) * | 2017-06-30 | 2017-09-19 | 中国科学院半导体研究所 | Narrow linewidth semiconductor laser based on external cavity type self feed back |
| CN109193330A (en) * | 2018-09-14 | 2019-01-11 | 中国科学院半导体研究所 | Light feedback arrangement and tunable narrow-linewidth outside cavity gas laser |
| US11901699B2 (en) | 2020-11-20 | 2024-02-13 | Suzhou Institute Of Nano-Tech And Nano-Bionics (Sinano) , Chinese Academy Of Sciences | Narrow linewidth laser |
| CN117578172A (en) * | 2024-01-17 | 2024-02-20 | 山东中芯光电科技有限公司 | Wavelength expansion method and system based on DBR laser |
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| CN117578172A (en) * | 2024-01-17 | 2024-02-20 | 山东中芯光电科技有限公司 | Wavelength expansion method and system based on DBR laser |
| CN117578172B (en) * | 2024-01-17 | 2024-05-17 | 山东中芯光电科技有限公司 | Wavelength expansion method and system based on DBR laser |
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