Photon crystal optical fibre coupling method and its coupling apparatus

Abstract

The invention relates to a photonic crystal fiber coupling method and a coupling device thereof. The method comprises the following steps of: determining the equivalent mold field radius of a photonic crystal fiber to be connected according to the specific parameters; selecting a corresponding extender lens and a focusing lens element according to the specific parameters of the photonic crystal fiber to be connected, and calculating the lens coupling optical path to determine a group of distance values for instructing the actual adjusting process; and adjusting the actual coupling optical path according to the distance parameters calculated in step 2 to obtain the minimal loss state, and carrying out a packaging connection. The device comprises a first and a second pins for fixing corresponding one ends of the photonic crystal fiber and a corresponding coupling optical fiber; the extender lens and the focusing lens arranged between the first and the second pins; and an engagement portion for respectively sheathing the first pin and the extender lens as well as the focusing lens and the second pin at the outer periphery of the engagement portion to package the elements; and an outer sleeve for entirely packaging and fixing the elements. The invention has the advantages of simple connection process, high optical fiber coupling efficiency and high connection strength and can eliminate loss resulting from mismatch of mold fields.

Description

technical field [0001] The invention relates to an optical fiber coupling device. In particular, it relates to a low-loss, high-intensity photonic crystal fiber coupling method and a coupling device that can connect a photonic crystal fiber with periodically arranged air holes in the cladding and a connected fiber. Background technique [0002] Photonic crystal fiber is a fiber with periodically arranged air holes in the cladding, also known as microstructure fiber or holey fiber, which can be divided into two types: index-guided type and bandgap waveguide type. The transmission mechanism of the former is improved total internal reflection. The latter utilizes the photonic bandgap effect. Because it can achieve characteristics such as unlimited single-mode transmission, large dispersion, and high nonlinearity that cannot be achieved by previous core / cladding optical fibers, it is regarded as a potential substitute for various functional optical fibers or optical fibers for ...

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Problems solved by technology

The reason why this kind of method can be used is that pure silica fiber has a high absorption peak at 1060nm wavelength, so the CO emission wavelength at this wavelength can be used 2 The laser cleans the end faces of the two optical fibers to be connected and fuses them; in addition, the CO 2 Lasers are easy to control the shape and power of the beam, but this method is more suitable for splicing large-aperture photonic crystal fibers. Factors such as size difference and lateral offset, fiber end face filling, condensed liquid trapped in the air capillary, fusion power and fusion time will seriously affect the connection quality of the fiber

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