CN102629729A - Blazed fiber bragg grating-based multi-wavelength optical fiber laser - Google Patents
Blazed fiber bragg grating-based multi-wavelength optical fiber laser Download PDFInfo
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Abstract
The invention discloses a blazed fiber bragg grating-based multi-wavelength optical fiber laser, relates to an optical fiber laser, is applicable to the field of optical fiber communication, and solves the problems of poor stability of multi-wavelength output, high cost and complex narrow bandwidth control means of the conventional optical fiber laser. The laser comprises an active optical fiber (1), a first photoelectric optical fiber (21), a second photoelectric optical fiber (22), first to nth uplink blazed fiber bragg gratings (31, 32,... ..., 3N), first to nth downlink blazed fiber bragg gratings (61, 62,... ..., 6N), a wavelength division multiplexer and a pumping source (5), wherein the first to nth uplink blazed fiber bragg gratings (31, 32,... ..., 3N) are carved on the first photoelectric optical fiber (21); the first to nth downlink blazed fiber bragg gratings (61, 62,... ..., 6N) are carved on the second photoelectric optical fiber (22); the first photoelectric optical fiber (21) and the second photoelectric optical fiber (22) are positioned in the same plane and are placed in parallel, and the minimum distance of edges of the first photosensitive fiber core (21) and the second photosensitive fiber core (22) is h; and grating forming surfaces of the first uplink blazed fiber bragg grating (31) and the first downlink blazed fiber bragg grating (61) are parallel to each other, form an angle theta with the first photosensitive fiber core (21) and the second photosensitive fiber core (22) and are perpendicular to the plane where the first photosensitive fiber core (21) and the second photosensitive fiber core (22) are positioned.
Description
Technical field
The present invention relates to a kind of fiber laser, be applicable to fiber optic communication field.
Background technology
In dense wavelength division multiplexing system, multiple wavelength optical signal needs multiple-wavelength laser to provide, and fiber laser is high with its beam quality in the laser of numerous types, compact conformation, and stable high advantage is developed rapidly.Tradition with the fiber laser of rare-earth-ion-doped Active Optical Fiber as gain media in; The selection of multi-wavelength signals realizes through multiwave frequency selective devices such as sampled-gratings; Through the continuous amplification and the selection of light signal in the resonant cavity, the output of the light signal of selected wavelength forms laser the most at last.
Fiber laser based on fiber grating roughly is divided into linear cavity structure and ring cavity structure at present; The fiber laser of linear cavity structure constitutes the frequency-selecting resonant cavity by the consistent Bragg fiber grating of two centre wavelengths; Active Optical Fiber in the chamber is as gain media, whole laser simple in structure.And multi-wavelength just will Bragg fiber grating wherein all changes and makes sampling optical-fiber grating or only with one of them replacement; Or even in the resonant cavity that original Bragg fiber grating constitutes, place the filtering device of sampling optical-fiber grating; Realize that the low-loss of required wavelength signals passes through; Its commplementary wave length then is depleted, the laser signal of a plurality of wavelength that final output output is required.But the laser signal broader bandwidth of each wavelength of fiber laser of this linear cavity structure will realize that narrow bandwidth then need shorten the length of corresponding resonant cavity, and this will make the gain of laser signal diminish, and threshold values increases, and is unfavorable for practical application.Or even when needs multi-wavelength single longitudinal mode laser was exported, the length of resonant cavity was limited in a centimetre magnitude, makes that the power output of laser is littler.
Though the fiber laser of annular chamber is only used a grating, stability is compared linear cavity and will be got well, and only needs wherein fiber grating changed into like need multi-wavelength output to be sampled-grating or in resonant cavity, to add extra sampled-grating again and can realize equally.But need use expensive circulator, this makes the cost of circular cavity optic fibre laser be difficult to fall to such an extent that get off.Because the stability of laser is one of important indicator of weighing its performance, therefore how keep in stable even reduce its cost of manufacture becoming current fiber laser and making a problem that is faced increasing it.
How obtaining simultaneously the laser of narrow bandwidth more becomes an emphasis of Laser Study; Melting cone type fiber laser in the one Chinese patent application 201110453893.1,201220006996.3 can realize the making of ultra consistent fiber grating and in the structure of similar annular chamber with linear cavity form work; Length through accurate control pyrometric cone district and grating; Can effectively realize the exciting of laser signal, but difficulty of processing is bigger in this process, the efficient of laser is low; The frequency-selecting that only relies on grating has a restriction to the further pressure of laser signal bandwidth is narrow, needs to increase other auxiliary equipment and carry out the selection of narrow bandwidth.
In sum, the problem that present multi-wavelength optical fiber laser need solve has: the poor stability of multi-wavelength output, and cost is high, and the control device of narrow bandwidth is complicated.
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Technical problem to be solved by this invention is: the poor stability of multi-wavelength output, and cost is high, and the control device of narrow bandwidth is complicated.
Technical scheme of the present invention is:
Multi-wavelength optical fiber laser based on blazed fiber bragg grating; It is characterized in that: this laser comprises Active Optical Fiber; First and second light-sensitive optical fibres; Be scribed at the blazed fiber bragg grating of setting out on a journey of first to N on first light-sensitive optical fibre, be scribed at road blazed fiber bragg grating, wavelength division multiplexer and pumping source under first to N on second light-sensitive optical fibre.
First, second light-sensitive optical fibre is in parallel placement in the same plane together, and the minimum distance at edge is h.
First the set out on a journey one-tenth grid face of blazed fiber bragg grating, first time road blazed fiber bragg grating is parallel to each other, becomes the θ angle with first, second light-sensitive optical fibre, and is vertical with the residing plane of first and second light-sensitive optical fibres; First set out on a journey blazed fiber bragg grating and the first time road blazed fiber bragg grating is L along the distance the most nearby of the first light-sensitive optical fibre direction
1First time road blazed fiber bragg grating and second blazed fiber bragg grating of setting out on a journey is L along the distance the most nearby of the first light-sensitive optical fibre direction
2
Second the set out on a journey one-tenth grid face of blazed fiber bragg grating, second time road blazed fiber bragg grating is parallel to each other, becomes the θ angle with first, second light-sensitive optical fibre, and is vertical with the residing plane of first and second light-sensitive optical fibres; Second set out on a journey blazed fiber bragg grating and the second time road blazed fiber bragg grating is L along the distance the most nearby of the first light-sensitive optical fibre direction
1
The N one-tenth grid face of road blazed fiber bragg grating of setting out on a journey under blazed fiber bragg grating, the N is parallel to each other, becomes the θ angle with first, second light-sensitive optical fibre, and is vertical with the residing plane of first and second light-sensitive optical fibres; Set out on a journey road blazed fiber bragg grating under blazed fiber bragg grating and the N of N is L along the distance the most nearby of the first light-sensitive optical fibre direction
1
The connected mode of each several part is: the 3rd port of a termination wavelength division multiplexer of Active Optical Fiber; One end of another termination first light-sensitive optical fibre of Active Optical Fiber; Second port of one termination wavelength division multiplexer of second light-sensitive optical fibre; First port of wavelength division multiplexer connects pumping source, and laser is from the other end output of first, second light-sensitive optical fibre.
Described Active Optical Fiber institute Doped Rare Earth ion comprises erbium ion, ytterbium ion, thulium ion, holmium ion, neodymium ion.
Described h satisfies: 0≤h≤10cm.
Described θ satisfies: 45 °＜θ＜90 °.
Described N satisfies: N >=2, and be integer.
Described L1 satisfies: L
1>=h/ (tan 2 θ).
Described L2 satisfies: 0≤L
2≤50cm.
Described first, second light-sensitive optical fibre has light sensitivity to ultraviolet light, all places air, water, refractive index index-matching fluid or the quartz crystal smaller or equal to the fiber cladding refractive index.
Described first to N sets out on a journey, and the road blazed fiber bragg grating is the Bragg blazed fiber bragg grating under blazed fiber bragg grating and first to N.
Described first blazed fiber bragg grating of setting out on a journey is consistent with the centre wavelength of first time road blazed fiber bragg grating, and bandwidth is consistent.
Described second blazed fiber bragg grating of setting out on a journey is consistent with the centre wavelength of second time road blazed fiber bragg grating, and bandwidth is consistent.
The described N centre wavelength of road blazed fiber bragg grating of setting out on a journey under blazed fiber bragg grating and the N is consistent, and bandwidth is consistent.
Described first to the N blazed fiber bragg grating centre wavelength of setting out on a journey is all different, and bandwidth does not have public part.
This laser comprises Active Optical Fiber, and first and second light-sensitive optical fibres are scribed at first, second and the 3rd set out on a journey blazed fiber bragg grating, wavelength division multiplexer and pumping source on first light-sensitive optical fibre.
First, second light-sensitive optical fibre is in parallel placement in the same plane together, and the minimum distance at edge is h.
First, second with the 3rd set out on a journey blazed fiber bragg grating the grid face that becomes become the θ angle with first light-sensitive optical fibre, vertical with the residing plane of first and second light-sensitive optical fibres.
The connected mode of each several part is: the 3rd port of a termination wavelength division multiplexer of Active Optical Fiber; One end of another termination first light-sensitive optical fibre of Active Optical Fiber; Second port of one termination wavelength division multiplexer of second light-sensitive optical fibre; First port of wavelength division multiplexer connects pumping source, and laser is from the other end output of first light-sensitive optical fibre.
Described first, second be the long period blazed fiber bragg grating with the 3rd blazed fiber bragg grating of setting out on a journey.
Described θ satisfies: 0 °＜θ＜45 °.
The present invention compares the beneficial effect that is had with prior art:
The conventional linear cavity optical fibre laser contains the consistent Bragg fiber grating of two centre wavelengths; Constitute the resonant cavity that light signal is amplified with this; In the chamber, place sampled-grating or directly replace the Bragg fiber grating to realize the output of multi-wavelength signals with sampled-grating, for each wavelength, resonant cavity is long more; Adjacent interval in length and breadth is more little, and the frequency-selecting effect of depending merely on grating can't make that the laser signal bandwidth is narrower.The present invention realizes the Compound Cavity structures with a plurality of blazed fiber bragg gratings, makes the light signal bandwidth of each wavelength all narrow down, or even single longitudinal mode, is depressed into the bandwidth of laser signal very narrow.Compare traditional ring cavity multiple-wavelength laser, structure according to the invention need not the high devices of price such as circulator, and directly generates the annular traveling wave chamber, cost about-face very not when the stability of laser is promoted greatly.
Description of drawings
Fig. 1 is the multi-wavelength optical fiber laser based on blazed fiber bragg grating of N wavelength of output.
Fig. 2 is the index path between the first upper and lower road blazed fiber bragg grating.
Fig. 3 is the multi-wavelength optical fiber laser based on blazed fiber bragg grating of two wavelength of output.
Fig. 4 is the multi-wavelength optical fiber laser based on blazed fiber bragg grating of 20 wavelength of output.
Fig. 5 is the multi-wavelength optical fiber laser based on blazed fiber bragg grating in the annular traveling wave chamber of three wavelength of output.
Fig. 6 is the index path of Fig. 5.
Embodiment
Below in conjunction with accompanying drawing the present invention is further described.
Execution mode one
Multi-wavelength optical fiber laser based on blazed fiber bragg grating; Like Fig. 1; This laser comprises Active Optical Fiber 1, the first and second light-sensitive optical fibre 21,22, be scribed at first to N on first light-sensitive optical fibre 21 set out on a journey blazed fiber bragg grating 31,32 ..., 3N; Be scribed at road blazed fiber bragg grating 61,62 under first to N on second light-sensitive optical fibre 22 ..., 6N, wavelength division multiplexer and pumping source 5.
First, second light-sensitive optical fibre 21,22 is in parallel placement in the same plane together, and the minimum distance at edge is h.The minimum distance at so-called edge is the value of the distance of shaft centers of two optical fiber from the radius gained that deducts again optical fiber.
First the set out on a journey one-tenth grid face of blazed fiber bragg grating 31, first time road blazed fiber bragg grating 61 is parallel to each other, and is with first, second light-sensitive optical fibre 21,22 one-tenth θ angles, vertical with first and second light-sensitive optical fibres, 21,22 residing planes; First set out on a journey blazed fiber bragg grating 31 and the first time road blazed fiber bragg grating 61 is L along the distance the most nearby of first light-sensitive optical fibre, 21 directions
1First time road blazed fiber bragg grating 61 and second blazed fiber bragg grating 32 of setting out on a journey is L along the distance the most nearby of first light-sensitive optical fibre, 21 directions
2So-called become the grid face to be that in the index modulation zone a series of planes of identical refractive index in the fiber grating, these planes are parallel to each other.
Second the set out on a journey one-tenth grid face of blazed fiber bragg grating 32, second time road blazed fiber bragg grating 62 is parallel to each other, and is with first, second light-sensitive optical fibre 21,22 one-tenth θ angles, vertical with first and second light-sensitive optical fibres, 21,22 residing planes; Second set out on a journey blazed fiber bragg grating 32 and the second time road blazed fiber bragg grating 62 is L along the distance the most nearby of first light-sensitive optical fibre, 21 directions
1
The N one-tenth grid face of road blazed fiber bragg grating 6N of setting out on a journey under blazed fiber bragg grating 3N, the N is parallel to each other, and is with first, second light-sensitive optical fibre 21,22 one-tenth θ angles, vertical with first and second light-sensitive optical fibres, 21,22 residing planes; Set out on a journey road blazed fiber bragg grating 6N under blazed fiber bragg grating 3N and the N of N is L along the distance the most nearby of first light-sensitive optical fibre, 21 directions
1
The connected mode of each several part is: the 3rd port 43 of a termination wavelength division multiplexer of Active Optical Fiber 1; One end of another termination first light-sensitive optical fibre 21 of Active Optical Fiber 1; Second port 42 of one termination wavelength division multiplexer of second light-sensitive optical fibre 22; First port 41 of wavelength division multiplexer connects pumping source 5, and laser is from the other end output of first, second light-sensitive optical fibre 21,22.
1 Doped Rare Earth ion of described Active Optical Fiber comprises erbium ion, ytterbium ion, thulium ion, holmium ion, neodymium ion.
Described h satisfies: 0≤h≤10cm.
Described θ satisfies: 45 °＜θ＜90 °.
Described N satisfies: N >=2, and be integer.
Described L
1Satisfy: L
1>=h/-tan 2 θ.
Described L
2Satisfy: 0≤L
2≤50cm.
21,22 pairs of ultraviolet lights of described first, second light-sensitive optical fibre have light sensitivity, all place air, water, refractive index index-matching fluid or the quartz crystal smaller or equal to the fiber cladding refractive index.
Described first blazed fiber bragg grating 31 of setting out on a journey is consistent with the centre wavelength of first time road blazed fiber bragg grating 61, and bandwidth is consistent.
Described second blazed fiber bragg grating 32 of setting out on a journey is consistent with the centre wavelength of second time road blazed fiber bragg grating 62, and bandwidth is consistent.
The described N centre wavelength of road blazed fiber bragg grating 6N of setting out on a journey under blazed fiber bragg grating 3N and the N is consistent, and bandwidth is consistent.
Described first to N set out on a journey blazed fiber bragg grating 31,32 ..., 3N centre wavelength is all different, bandwidth does not have public part.
Described first to N set out on a journey blazed fiber bragg grating 31,32 ..., road blazed fiber bragg grating 61,62 under the 3N and first to N ..., 6N is the Bragg blazed fiber bragg grating.
What Bragg blazed fiber bragg grating and the difference of traditional B ragg fiber grating only were the Bragg blazed fiber bragg grating becomes the grid face not vertical with place optical fiber.The index modulation cycle of Bragg blazed fiber bragg grating is less than 1 micron.
The first upper and lower road blazed fiber bragg grating 31, the index path between 61 are as shown in Figure 2, and the direction of arrow is the direction of the light signal wherein propagated, and such setting makes whole resonant cavity form annular compound resonance standing-wave cavity structure, increases resonant cavity stability.By that analogy.
Execution mode two
Multi-wavelength optical fiber laser based on blazed fiber bragg grating; Like Fig. 3; This laser comprises Active Optical Fiber 1, the first and second light-sensitive optical fibre 21,22, is scribed at first, second blazed fiber bragg grating 31,32 of setting out on a journey on first light-sensitive optical fibre 21; Be scribed at first, second the following road blazed fiber bragg grating 61,62 on second light-sensitive optical fibre 22, wavelength division multiplexer and pumping source 5.
First, second light-sensitive optical fibre 21,22 is in parallel placement in the same plane together, and the minimum distance at edge is h.
First the set out on a journey one-tenth grid face of blazed fiber bragg grating 31, first time road blazed fiber bragg grating 61 is parallel to each other, and is with first, second light-sensitive optical fibre 21,22 one-tenth θ angles, vertical with first and second light-sensitive optical fibres, 21,22 residing planes; First set out on a journey blazed fiber bragg grating 31 and the first time road blazed fiber bragg grating 61 is L along the distance the most nearby of first light-sensitive optical fibre, 21 directions
1First time road blazed fiber bragg grating 61 and second blazed fiber bragg grating 32 of setting out on a journey is L along the distance the most nearby of first light-sensitive optical fibre, 21 directions
2
Second the set out on a journey one-tenth grid face of blazed fiber bragg grating 32, second time road blazed fiber bragg grating 62 is parallel to each other, and is with first, second light-sensitive optical fibre 21,22 one-tenth θ angles, vertical with first and second light-sensitive optical fibres, 21,22 residing planes; Second set out on a journey blazed fiber bragg grating 32 and the second time road blazed fiber bragg grating 62 is L along the distance the most nearby of first light-sensitive optical fibre, 21 directions
1
The connected mode of each several part is: the 3rd port 43 of a termination wavelength division multiplexer of Active Optical Fiber 1; One end of another termination first light-sensitive optical fibre 21 of Active Optical Fiber 1; Second port 42 of one termination wavelength division multiplexer of second light-sensitive optical fibre 22; First port 41 of wavelength division multiplexer connects pumping source 5, and laser is from the other end output of first, second light-sensitive optical fibre 21,22.
1 Doped Rare Earth ion of described Active Optical Fiber is an erbium ion.
Described h satisfies: 0≤h≤10cm.
Described θ satisfies: 45 °＜θ＜90 °.
Described L
1Satisfy: L
1>=h/-tan 2 θ.
Described L
2Satisfy: 0≤L
2≤50cm.
21,22 pairs of ultraviolet lights of described first, second light-sensitive optical fibre have light sensitivity, all place air.
Described first blazed fiber bragg grating 31 of setting out on a journey is consistent with the centre wavelength of first time road blazed fiber bragg grating 61, and bandwidth is consistent.
Described second blazed fiber bragg grating 32 of setting out on a journey is consistent with the centre wavelength of second time road blazed fiber bragg grating 62, and bandwidth is consistent.
Described first, second blazed fiber bragg grating 31,32 centre wavelengths of setting out on a journey are different, and bandwidth does not have public part.
Described first, second set out on a journey blazed fiber bragg grating 31,32 and first, second down road blazed fiber bragg grating 61,62 be the Bragg blazed fiber bragg grating.
The first upper and lower road blazed fiber bragg grating 31, the index path between 61 are as shown in Figure 2, and the direction of arrow is the direction of the light signal wherein propagated, and such setting makes whole resonant cavity form the travelling-wave cavity structure, increases resonant cavity stability.By that analogy.
Execution mode three
Multi-wavelength optical fiber laser based on blazed fiber bragg grating; Like Fig. 4; This laser comprises Active Optical Fiber 1, the first and second light-sensitive optical fibre 21,22, be scribed at the first to the 20 on first light-sensitive optical fibre 21 set out on a journey blazed fiber bragg grating 31,32 ..., 320; Be scribed at the first to the 20 time road blazed fiber bragg grating 61,62 on second light-sensitive optical fibre 22 ..., 620, wavelength division multiplexer and pumping source 5.
First, second light-sensitive optical fibre 21,22 is in parallel placement in the same plane together, and the minimum distance at edge is h.
First the set out on a journey one-tenth grid face of blazed fiber bragg grating 31, first time road blazed fiber bragg grating 61 is parallel to each other, and is with first, second light-sensitive optical fibre 21,22 one-tenth θ angles, vertical with first and second light-sensitive optical fibres, 21,22 residing planes; First set out on a journey blazed fiber bragg grating 31 and the first time road blazed fiber bragg grating 61 is L along the distance the most nearby of first light-sensitive optical fibre, 21 directions
1First time road blazed fiber bragg grating 61 and second blazed fiber bragg grating 32 of setting out on a journey is L along the distance the most nearby of first light-sensitive optical fibre, 21 directions
2
Second the set out on a journey one-tenth grid face of blazed fiber bragg grating 32, second time road blazed fiber bragg grating 62 is parallel to each other, and is with first, second light-sensitive optical fibre 21,22 one-tenth θ angles, vertical with first and second light-sensitive optical fibres, 21,22 residing planes; Second set out on a journey blazed fiber bragg grating 32 and the second time road blazed fiber bragg grating 62 is L along the distance the most nearby of first light-sensitive optical fibre, 21 directions
1
……
The 20 the set out on a journey one-tenth grid face of the 320, the 20 time road blazed fiber bragg grating 620 of blazed fiber bragg grating is parallel to each other, and is with first, second light-sensitive optical fibre 21,22 one-tenth θ angles, vertical with first and second light-sensitive optical fibres, 21,22 residing planes; The 20 set out on a journey blazed fiber bragg grating 320 and the 20 time road blazed fiber bragg grating 620 is L along the distance the most nearby of first light-sensitive optical fibre, 21 directions
1
The connected mode of each several part is: the 3rd port 43 of a termination wavelength division multiplexer of Active Optical Fiber 1; One end of another termination first light-sensitive optical fibre 21 of Active Optical Fiber 1; Second port 42 of one termination wavelength division multiplexer of second light-sensitive optical fibre 22; First port 41 of wavelength division multiplexer connects pumping source 5, and laser is from the other end output of first, second light-sensitive optical fibre 21,22.
1 Doped Rare Earth ion of described Active Optical Fiber is a ytterbium ion.
Described h satisfies: 0≤h≤10cm.
Described θ satisfies: 45 °＜θ＜90 °.
Described L
1Satisfy: L
1>=h/-tan 2 θ.
Described L
2Satisfy: 0≤L
2≤50cm.
21,22 pairs of ultraviolet lights of described first, second light-sensitive optical fibre have light sensitivity, all place water.
Described first blazed fiber bragg grating 31 of setting out on a journey is consistent with the centre wavelength of first time road blazed fiber bragg grating 61, and bandwidth is consistent.
Described second blazed fiber bragg grating 32 of setting out on a journey is consistent with the centre wavelength of second time road blazed fiber bragg grating 62, and bandwidth is consistent.
The described the 20 blazed fiber bragg grating 320 of setting out on a journey is consistent with the centre wavelength of the 20 time road blazed fiber bragg grating 620, and bandwidth is consistent.
The described the first to the 20 set out on a journey blazed fiber bragg grating 31,32 ..., 320 centre wavelengths are all different, bandwidth does not have public part.
The described the first to the 20 set out on a journey blazed fiber bragg grating 31,32 ..., 320 and the first to the 20 times road blazed fiber bragg gratings 61,62 ..., 620 be the Bragg blazed fiber bragg grating.
Execution mode four
Multi-wavelength optical fiber laser based on blazed fiber bragg grating; Like Fig. 5, this laser comprises Active Optical Fiber 1, the first and second light-sensitive optical fibre 21,22; Be scribed at first to the 3rd on first light-sensitive optical fibre 21 set out on a journey blazed fiber bragg grating 31,32,33, wavelength division multiplexer and pumping source 5.
First, second light-sensitive optical fibre 21,22 is in parallel placement in the same plane together, and the minimum distance at edge is h.
First, second, third set out on a journey blazed fiber bragg grating 31,32,33 21 one-tenth θ angles of the one-tenth grid face and first light-sensitive optical fibre, vertical with first and second light-sensitive optical fibres, 21,22 residing planes.
The connected mode of each several part is: the 3rd port 43 of a termination wavelength division multiplexer of Active Optical Fiber 1; One end of another termination first light-sensitive optical fibre 21 of Active Optical Fiber 1; Second port 42 of one termination wavelength division multiplexer of second light-sensitive optical fibre 22; First port 41 of wavelength division multiplexer connects pumping source 5, and laser is from the other end output of first light-sensitive optical fibre 21.
1 Doped Rare Earth ion of described Active Optical Fiber is a thulium ion.
Described h satisfies: 0≤h≤10cm.
Described θ satisfies: 0 °＜θ＜45 °.
21,22 pairs of ultraviolet lights of described first, second light-sensitive optical fibre have light sensitivity, all place index-matching fluid or the quartz crystal of refractive index smaller or equal to the fiber cladding refractive index.
Described first, second, third blazed fiber bragg grating 31,32,33 centre wavelengths of setting out on a journey are all different, and bandwidth does not have public part, is the long period blazed fiber bragg grating.What long period blazed fiber bragg grating and the difference of traditional LPFG only were the long period blazed fiber bragg grating becomes the grid face not vertical with place optical fiber.So-called long-period gratings is the index modulation cycle greater than 1 micron grating.
First, second light-sensitive optical fibre 31, the index path between 32 are as shown in Figure 6, and the direction of arrow is the direction of the light signal wherein propagated, and such setting makes whole resonant cavity form the annular traveling wave cavity configuration of multi-wavelength, increases resonant cavity stability.
Claims (5)
1. based on the multi-wavelength optical fiber laser of blazed fiber bragg grating; It is characterized in that: this laser comprises Active Optical Fiber (1); First and second light-sensitive optical fibres (21,22); Be scribed at first to N on first light-sensitive optical fibre (21) set out on a journey blazed fiber bragg grating (31,32 ..., 3N), be scribed at road blazed fiber bragg grating under first to N on second light-sensitive optical fibre (22) (61,62 ..., 6N), wavelength division multiplexer and pumping source (5);
First, second light-sensitive optical fibre (21,22) is in parallel placement in the same plane together, and the minimum distance at edge is h;
First the set out on a journey one-tenth grid face of blazed fiber bragg grating (31), first time road blazed fiber bragg grating (61) is parallel to each other, becomes the θ angle with first, second light-sensitive optical fibre (21,22), and is vertical with the residing plane of first and second light-sensitive optical fibres (21,22); First set out on a journey blazed fiber bragg grating (31) and the first time road blazed fiber bragg grating (61) is L along the distance the most nearby of first light-sensitive optical fibre (21) direction
1First time road blazed fiber bragg grating (61) and second blazed fiber bragg grating (32) of setting out on a journey is L along the distance the most nearby of first light-sensitive optical fibre (21) direction
2
Second the set out on a journey one-tenth grid face of blazed fiber bragg grating (32), second time road blazed fiber bragg grating (62) is parallel to each other, becomes the θ angle with first, second light-sensitive optical fibre (21,22), and is vertical with the residing plane of first and second light-sensitive optical fibres (21,22); Second set out on a journey blazed fiber bragg grating (32) and the second time road blazed fiber bragg grating (62) is L along the distance the most nearby of first light-sensitive optical fibre (21) direction
1
The N one-tenth grid face of road blazed fiber bragg grating (6N) of setting out on a journey under blazed fiber bragg grating (3N), the N is parallel to each other, becomes the θ angle with first, second light-sensitive optical fibre (21,22), and is vertical with the residing plane of first and second light-sensitive optical fibres (21,22); Set out on a journey road blazed fiber bragg grating (6N) under blazed fiber bragg grating (3N) and the N of N is L along the distance the most nearby of first light-sensitive optical fibre (21) direction
1
The connected mode of each several part is: the 3rd port (43) of a termination wavelength division multiplexer of Active Optical Fiber (1); One end of another termination first light-sensitive optical fibre (21) of Active Optical Fiber (1); Second port (42) of one termination wavelength division multiplexer of second light-sensitive optical fibre (22); First port (41) of wavelength division multiplexer connects pumping source (5), and laser is from the other end output of first, second light-sensitive optical fibre (21,22).
2. the multi-wavelength optical fiber laser based on blazed fiber bragg grating according to claim 1 is characterized in that:
Described Active Optical Fiber (1) institute Doped Rare Earth ion comprises erbium ion, ytterbium ion, thulium ion, holmium ion, neodymium ion;
Described h satisfies: 0≤h≤10cm;
Described θ satisfies: 45 °＜θ＜90 °;
Described N satisfies: N >=2, and be integer;
Described L
1Satisfy: L
1>=h/ (tan 2 θ);
Described L
2Satisfy: 0≤L
2≤50cm.
3. the multi-wavelength optical fiber laser based on blazed fiber bragg grating according to claim 1 is characterized in that:
Described first, second light-sensitive optical fibre (21,22) has light sensitivity to ultraviolet light, all places air, water, refractive index index-matching fluid or the quartz crystal smaller or equal to the fiber cladding refractive index.
4. the multi-wavelength optical fiber laser based on blazed fiber bragg grating according to claim 1 is characterized in that:
Described first to N set out on a journey blazed fiber bragg grating (31,32 ..., 3N) and first to N under the road blazed fiber bragg grating (61,62 ..., 6N) be the Bragg blazed fiber bragg grating;
Described first blazed fiber bragg grating (31) of setting out on a journey is consistent with the centre wavelength of first time road blazed fiber bragg grating (61), and bandwidth is consistent;
Described second blazed fiber bragg grating (32) of setting out on a journey is consistent with the centre wavelength of second time road blazed fiber bragg grating (62), and bandwidth is consistent;
The described N centre wavelength of road blazed fiber bragg grating (6N) of setting out on a journey under blazed fiber bragg grating (3N) and the N is consistent, and bandwidth is consistent;
Described first to N set out on a journey blazed fiber bragg grating (31,32 ..., 3N) centre wavelength is all different, bandwidth does not have public part.
5. the multi-wavelength optical fiber laser based on blazed fiber bragg grating according to claim 1 is characterized in that:
This laser comprises Active Optical Fiber (1), and first and second light-sensitive optical fibres (21,22) are scribed at first, second and the 3rd blazed fiber bragg grating (31,32,33) of setting out on a journey, wavelength division multiplexer and pumping source (5) on first light-sensitive optical fibre (21);
First, second light-sensitive optical fibre (21,22) is in parallel placement in the same plane together, and the minimum distance at edge is h;
First, second with the 3rd set out on a journey blazed fiber bragg grating (31,32,33) the grid face that becomes become the θ angle with first light-sensitive optical fibre (21), vertical with the residing plane of first and second light-sensitive optical fibres (21,22);
The connected mode of each several part is: the 3rd port (43) of a termination wavelength division multiplexer of Active Optical Fiber (1); One end of another termination first light-sensitive optical fibre (21) of Active Optical Fiber (1); Second port (42) of one termination wavelength division multiplexer of second light-sensitive optical fibre (22); First port (41) of wavelength division multiplexer connects pumping source (5), and laser is from the other end output of first light-sensitive optical fibre (21);
Described first, second be the long period blazed fiber bragg grating with the 3rd blazed fiber bragg grating (31,32,33) of setting out on a journey;
Described θ satisfies: 0 °＜θ＜45 °.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111711057A (en) * | 2019-11-28 | 2020-09-25 | 北京交通大学 | Synchronous spectrum-overlapped multi-wavelength pulse laser |
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| US20060215976A1 (en) * | 2005-03-22 | 2006-09-28 | Matsushita Electric Industrial Co., Ltd. | Multicore optical fiber with integral diffractive elements machined by ultrafast laser direct writing |
| CN102157889A (en) * | 2011-03-21 | 2011-08-17 | 山东大学 | Fiber optical laser of L waveband with wavelength tunable |
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- 2012-04-19 CN CN2012101154934A patent/CN102629729A/en active Pending
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|---|---|---|---|---|
| US20060215976A1 (en) * | 2005-03-22 | 2006-09-28 | Matsushita Electric Industrial Co., Ltd. | Multicore optical fiber with integral diffractive elements machined by ultrafast laser direct writing |
| CN102157889A (en) * | 2011-03-21 | 2011-08-17 | 山东大学 | Fiber optical laser of L waveband with wavelength tunable |
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| VICTOR GRUBSKY ET AL.: "Wavelength-selective coupler and add-drop multiplexer using long-period fiber gratings", 《2000 OPTICAL FIBER COMMUNICATION CONFERENCE》, vol. 4, 6 August 2002 (2002-08-06) * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111711057A (en) * | 2019-11-28 | 2020-09-25 | 北京交通大学 | Synchronous spectrum-overlapped multi-wavelength pulse laser |
| CN111711057B (en) * | 2019-11-28 | 2021-08-24 | 北京交通大学 | Synchronous spectrum-overlapped multi-wavelength pulse laser |
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