CN202797597U - Fiber coupled laser having high extinction ratio - Google Patents
Fiber coupled laser having high extinction ratio Download PDFInfo
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- CN202797597U CN202797597U CN 201220519527 CN201220519527U CN202797597U CN 202797597 U CN202797597 U CN 202797597U CN 201220519527 CN201220519527 CN 201220519527 CN 201220519527 U CN201220519527 U CN 201220519527U CN 202797597 U CN202797597 U CN 202797597U
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Abstract
The utility model relates to the technical field of laser and discloses a fiber coupled laser having a high extinction ratio. The fiber coupled laser comprises a laser, a coupled optical system, and a polarization maintaining fiber, which are sequentially arranged. The fiber coupled laser further comprises a birefringence crystal which is arranged between optical elements of the coupled optical system or between the coupled optical system and the polarization maintaining fiber. Laser light sent by the laser, after passing through the coupled optical system and the birefringence crystal, is divided into two polarized light beams which have mutually perpendicular polarization directions, and the distance between the two light beams is larger than the diameter of a fiber core of the polarization maintaining fiber. One of the polarized light beams is coupled into the polarization maintaining fiber. By employing the crystal which is high in birefringence, the laser light is divided into the two polarized light beams which have mutually perpendicular polarization directions, and one of the polarized light beams is coupled into the polarization maintaining fiber so that the laser light is prevent from causing polarization state mode coupling phenomena while being transmitted in the polarization maintaining fiber, thereby creating a fiber coupling product which is high in extinction ratio and low in noise.
Description
Technical field
The utility model relates to laser technology field, relates in particular to a kind of fiber coupled laser of High Extinction Ratio.
Background technology
The polarization maintaining optical fibre coupled laser is owing to have stronger hold facility to linearly polarized light, therefore not only in optical communication and light sensing in occupation of consequence more and more, and also bringing into play more and more important effect at aspects such as industry, electric power, military affairs, Aero-Space, biomedicines.
Polarization maintaining optical fibre is to utilize stress or deformation to realize two high birefringences between the intrinsic polarization mode, can effectively overcome various perturbations that the composition defective of stress in the optical fiber, deformation, torsion temperature, electromagnetic field and inside of optical fibre or shape defect etc. cause to the impact of phase place and the polarization state of lightwave signal in the optical fiber by this artificial high birefringence effect, thereby realize the maintenance function to optical polarization.But the interference to external world of the polarization state of inside of optical fibre light signal is very responsive, and it is very large to reach the strict symmetrical difficulty of incident laser polarization direction and fiber stress axle in the assembling product process.When the interference strength in the external world constantly increase and the incident laser polarization direction not strict when symmetrical with the fiber stress axle, polarization state Mode Coupling phenomenon will occur in the light signal of polarization maintaining optical fibre inside, and namely a kind of energy of polarization state will be coupled in another polarization state and goes in polarization maintaining optical fibre.This polarization coupled phenomenon will show as the phenomenons such as extinction ratio decline, noise increase in various systems, have a strong impact on the signal accuracy.
Summary of the invention
For the problems referred to above, the utility model proposes a kind of fiber coupled laser of High Extinction Ratio, have High Extinction Ratio, low noise and other advantages.
For achieving the above object, the technical solution of the utility model is: a kind of fiber coupled laser of High Extinction Ratio, comprise the laser, coupling optical system and the polarization maintaining optical fibre that set gradually, and also comprise a birefringece crystal; Described birefringece crystal places between the optical element of coupling optical system, or places between coupling optical system and the polarization maintaining optical fibre; The laser that laser sends be divided into the orthogonal two bundle polarised lights in polarization direction, and the spacing between two light beams is greater than the core diameter of polarization maintaining optical fibre after coupling optical system and birefringece crystal; Wherein a branch of polarised light is coupled into polarization maintaining optical fibre.
Further, described polarization maintaining optical fibre coupled end is fixed by an optical fiber fixing plug pin.
Further, described coupling optical system is a coupled lens, and described birefringece crystal places between coupled lens and the polarization maintaining optical fibre.
Further, described coupling optical system comprises collimation lens and a coupled lens, and described birefringece crystal places between collimating lens and the coupled lens.
Further, described laser is semiconductor laser or solid state laser.
Further, described birefringece crystal is YVO
4The high birefringence rate crystal such as crystal, α-bbo crystal or Iceland spar.
Further, the logical light face of described birefringece crystal and each optical element of coupling optical system all is coated with anti-reflection film.
Further, the fiber end face of described polarization maintaining optical fibre is the lower coupling angles of return loss such as 0 ° or oblique 8 °.
The beneficial effects of the utility model are: used the high birefringence rate crystal that laser is divided into the orthogonal two bundle polarised lights in polarization direction, and make two light beam spacings much larger than the core diameter of polarization maintaining optical fibre, the position of adjusting polarization maintaining optical fibre is only incited somebody to action wherein, and a branch of polarised light is coupled in the polarization maintaining optical fibre, polarization state Mode Coupling phenomenon occurs when avoiding laser to transmit in polarization maintaining optical fibre, thus Effective Raise extinction ratio and the noiseproof feature of coupling fiber product.
Description of drawings
Fig. 1 is the utility model embodiment one structural representation;
Fig. 2 is the utility model embodiment two structural representations;
Fig. 3 is the utility model embodiment three structural representations.
Reference numeral: 1, semiconductor laser; 101, chip of laser; 102, heat dissipation base; 2, coupling optical system; 201, collimating lens; 202, condenser lens; 3, birefringece crystal; 4, optical fiber fixing plug pin; 5, polarization maintaining optical fibre; 6, solid state laser.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is described further.
The utility model adopts the high birefringence rate crystal that laser is divided into the orthogonal two bundle polarised lights in polarization direction, thickness by design high birefringence rate crystal, so that through spacing between two light beams after the birefringece crystal much larger than the core diameter of polarization maintaining optical fibre, the position of adjustment polarization maintaining optical fibre is only incited somebody to action wherein, and a branch of polarised light is coupled in the polarization maintaining optical fibre, polarization state Mode Coupling phenomenon occurs when avoiding laser to transmit in polarization maintaining optical fibre, thereby extinction ratio and the noiseproof feature of Effective Raise coupling fiber product are realized low noise High Extinction Ratio fiber coupled laser.Concrete, High Extinction Ratio fiber coupled laser of the present utility model comprises the laser, coupling optical system 2 and the polarization maintaining optical fibre 5 that set gradually, also comprises a birefringece crystal 3; This birefringece crystal 3 places between the optical element of coupling optical system 2, or places between coupling optical system 2 and the polarization maintaining optical fibre 5; The laser that laser sends be divided into the orthogonal two bundle polarised lights in polarization direction, and the spacing between two light beams is greater than the core diameter of polarization maintaining optical fibre 5 after coupling optical system 2 and birefringece crystal 3; Wherein a branch of polarised light is coupled into polarization maintaining optical fibre 5.
Concrete, embodiment one as shown in Figure 1, laser among this embodiment adopts semiconductor laser 1, the semiconductor laser chip 101 of 635nm is placed on the heat dissipation base 102, the light that semiconductor laser 1 sends enters birefringece crystal 3 behind coupling optical system 2, birefringece crystal 3 adopts YVO among this embodiment
4Crystal, crystal thickness adopts 0.5mm, places between coupling optical system 2 and the polarization maintaining optical fibre 5, and wherein the coupled end of polarization maintaining optical fibre 5 is fixing by an optical fiber fixing plug pin 4.The laser beam of 635nm is through YVO
4Be divided into orthogonal two light beams in polarization direction after the crystal, and spacing is about 52.9 μ m between two light beams, much larger than the core diameter (4 ~ 5 μ m) of 635nm polarization maintaining optical fibre 5.By regulating the position of polarization maintaining optical fibre 5, only wherein a branch of polarised light is coupled in the polarization maintaining optical fibre 5, and polarization state Mode Coupling phenomenon occurs in the time of just can avoiding laser to transmit in polarization maintaining optical fibre, thereby improves extinction ratio and the noiseproof feature of fiber coupled laser.Wherein, what coupling optical system 2 adopted is einzel lens, adopts the mode of end face coupling; Optical fiber fixing plug pin 4 can be pottery or glass material etc.
Be embodiment two of the present utility model as shown in Figure 2, different from embodiment one is that the coupling optical system 2 of this embodiment adopts double lens: collimating lens 201 and condenser lens 202, birefringece crystal 3 place between collimating lens 201 and the condenser lens 202; And semiconductor laser 1 employing is the chip of laser 101 of 405nm, what birefringece crystal 3 adopted is α-bbo crystal, crystal thickness adopts 0.5mm, the laser beam of 405nm enters α-bbo crystal after collimating lens 201, be divided into orthogonal two light beams in polarization direction through α-bbo crystal, and spacing is about 44.1 μ m between two light beams, core diameter (3.1 ~ 4.1 μ m) much larger than 405nm polarization maintaining optical fibre 5, regulate the position of condenser lens 202 and polarization maintaining optical fibre 5, wherein a branch of polarised light focuses on and is coupled in the polarization maintaining optical fibre 5.Assemble coupling by condenser lens 202, can realize higher coupling efficiency.
Be illustrated in figure 3 as embodiment three of the present utility model, different from embodiment one is, what laser adopted among this embodiment is solid state laser 6, solid state laser 6 optical maser wavelengths among this embodiment are 532nm, what birefringece crystal 3 adopted is α-bbo crystal, crystal thickness is 0.5mm, the laser beam of 532nm enters α-bbo crystal after coupling optical system 2, behind α-bbo crystal, be divided into orthogonal two light beams in polarization direction, and spacing is about 44.1 μ m between two light beams, much larger than the core diameter (3.5 ~ 4.5 μ m) of 532nm polarization maintaining optical fibre 5.By regulating the position of polarization maintaining optical fibre 5, only wherein a branch of polarised light is coupled in the polarization maintaining optical fibre 5, and polarization state Mode Coupling phenomenon occurs in the time of just can avoiding laser to transmit in polarization maintaining optical fibre 5, thereby improves extinction ratio and the noiseproof feature of fiber coupled laser.
Fiber coupled laser of the present utility model is because being coupled to the laser that only has a kind of polarization state pattern in the optical fiber, thereby avoided light that polarization state Mode Coupling phenomenon occurs in Optical Fiber Transmission, but so extinction ratio and the noiseproof feature of Effective Raise coupling fiber product.
Although specifically show and introduced the utility model in conjunction with preferred embodiment; but the those skilled in the art should be understood that; within not breaking away from the spirit and scope of the present utility model that appended claims limits; the various variations of in the form and details the utility model being made are protection range of the present utility model.
Claims (8)
1. the fiber coupled laser of a High Extinction Ratio comprises the laser, coupling optical system and the polarization maintaining optical fibre that set gradually, it is characterized in that: also comprise a birefringece crystal; Described birefringece crystal places between the optical element of coupling optical system, or places between coupling optical system and the polarization maintaining optical fibre; The laser that laser sends be divided into the orthogonal two bundle polarised lights in polarization direction, and the spacing between two light beams is greater than the core diameter of polarization maintaining optical fibre after coupling optical system and birefringece crystal; Wherein a branch of polarised light is coupled into polarization maintaining optical fibre.
2. a kind of fiber coupled laser of High Extinction Ratio as claimed in claim 1, it is characterized in that: described polarization maintaining optical fibre coupled end is fixed by an optical fiber fixing plug pin.
3. a kind of fiber coupled laser of High Extinction Ratio as claimed in claim 1, it is characterized in that: described coupling optical system is a coupled lens, and described birefringece crystal places between coupled lens and the polarization maintaining optical fibre.
4. a kind of fiber coupled laser of High Extinction Ratio as claimed in claim 1, it is characterized in that: described coupling optical system comprises collimation lens and a coupled lens, and described birefringece crystal places between collimating lens and the coupled lens.
5. a kind of fiber coupled laser of High Extinction Ratio as claimed in claim 1, it is characterized in that: described laser is semiconductor laser or solid state laser.
6. a kind of fiber coupled laser of High Extinction Ratio as claimed in claim 1, it is characterized in that: described birefringece crystal is YVO
4Crystal, α-bbo crystal or Iceland spar.
7. such as the fiber coupled laser of claim 1-6 a kind of High Extinction Ratio as described in each, it is characterized in that: the logical light face of described birefringece crystal and each optical element of coupling optical system all is coated with anti-reflection film.
8. such as the fiber coupled laser of claim 1-6 a kind of High Extinction Ratio as described in each, it is characterized in that: the fiber end face of described polarization maintaining optical fibre is 0 ° or oblique 8 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220519527 CN202797597U (en) | 2012-10-11 | 2012-10-11 | Fiber coupled laser having high extinction ratio |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220519527 CN202797597U (en) | 2012-10-11 | 2012-10-11 | Fiber coupled laser having high extinction ratio |
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| CN202797597U true CN202797597U (en) | 2013-03-13 |
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| CN 201220519527 Expired - Lifetime CN202797597U (en) | 2012-10-11 | 2012-10-11 | Fiber coupled laser having high extinction ratio |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109387948A (en) * | 2017-08-04 | 2019-02-26 | 维林光电(苏州)有限公司 | A kind of optical fiber output laser |
-
2012
- 2012-10-11 CN CN 201220519527 patent/CN202797597U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109387948A (en) * | 2017-08-04 | 2019-02-26 | 维林光电(苏州)有限公司 | A kind of optical fiber output laser |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20191011 Address after: 350000 China Aviation Technology Industrial Zone 253 Fuxing East Road, Jinan District, Fuzhou City, Fujian Province Patentee after: FUZHOU PHOTOP QPTICS Co.,Ltd. Address before: 200233, Shanghai, Qinzhou, Xuhui District North Road, No. 54, building No. 1089, third floor Patentee before: II-VI SUWTECH Inc. |
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| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130313 |