High-efficiency all-fiber single-vector-mode coupler
A mode-coupling and all-fiber technology, applied in the field of couplers, can solve the problems of poor controllability and low anti-interference ability, and achieve the effects of high-efficiency coupling, strong anti-environmental interference ability, and stable polarization state input and output
Pending Publication Date: 2021-10-26
安徽天琢激光科技有限公司
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Problems solved by technology
[0004] The purpose of the present invention is to solve the problems of poor controllability and low anti-interference ability of existing single vector mode fiber couplers. Based on polarization maintaining single mode fiber and long period ring fiber grating, a high efficiency all fiber Single Vector Mode Coupler
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[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0030] see Figure 1-6 , the present invention provides a technical solution: including a polarization maintaining polarizer 1, a polarization maintaining single-mode fiber 2, a long-period ring fiber grating 3 and a ring few-mode fiber 4, the polarization maintaining polarizer 1 is used to polarize the incident light The direction is fixed as one of the slow axis or fast axis of the polarization-maintaining fiber; the polarization-maintaining single-mode fibe...
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Abstract
The invention relates to the technical field of couplers, and particularly discloses a high-efficiency all-fiber single-vector-mode coupler, which comprises a polarization-maintaining polarizer, a polarization-maintaining single-mode fiber, an annular few-mode fiber and a long-period annular fiber bragg grating which are connected in sequence. The long-period annular fiber bragg grating is inscribed by a CO2 laser; the exposure direction of the long-period annular fiber bragg grating is perpendicular to or parallel to the slow axis of the polarization-maintaining single-mode optical fiber, the polarization-maintaining polarizer is used for fixing the polarization state of input light to be linear polarized light along the slow axis or fast axis of the polarization-maintaining single-mode optical fiber, the annular few-mode optical fiber supports LP01 and LP11 modes at the same time at the wave band of 1.0 micrometer or 1.5 micrometer, and the effective refractive index difference between single vector modes in the LP11 mode is larger than 10 <-4 >. The coupler can support low-crosstalk transmission of a single vector mode in the optical fiber, can achieve efficient coupling from a fundamental mode to the single vector mode, generates a high-purity single vector mode, and solves the problem that an existing optical fiber coupler stably generates a high-purity single high-order mode.
Description
technical field [0001] The invention relates to the technical field of couplers, in particular to a high-efficiency all-fiber single vector mode coupler. Background technique [0002] The single vector mode in the optical fiber has special polarization characteristics and mode field distribution. For example, the polarization of the TE01 mode is distributed along the angular direction, and its mode field distribution is circular. After focusing, it has a hollow intensity distribution. It has important applications in the field of optical tweezers. value. The TM01 mode, whose polarization is distributed along the radial direction, has unique advantages for surface plasmon excitation, and its spot size under tight focusing can break through the diffraction limit, and has important applications in the fields of microscopic imaging and optical storage. The two odd and even modes of the HE21 mode can be superimposed with a phase of π / 2 to generate an orbital angular momentum bea...
Claims
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Login to View More IPC IPC(8): G02B6/293
CPCG02B6/293G02B6/29316
Inventor 张万兵张一民
Owner 安徽天琢激光科技有限公司