Photonic crystal optical fiber coupler and manufacturing method thereof

Abstract

The invention relates to a photonic crystal optical fiber coupler and a manufacturing method thereof. The method comprises the following steps: polishing halves of the side faces of two identical photonic crystal optical fibers in the photonic crystal optical fiber coupler, and jointing polishing surfaces via an optical cement technology to form a Y-branch photonic crystal optical fiber waveguide structure, wherein the vertex end face structure of a Y-branch photonic crystal optical fiber is the same as that of an original photonic crystal optical fiber; fusing (butting) the vertex of the Y-branch photonic crystal optical fiber with the vertex of a single optical fiber or another Y-branch photonic crystal optical fiber to obtain the photonic crystal optical fiber coupler based on a wave front splitting principle. According to the method, a 1*2 or 2*2 photonic crystal optical fiber coupler can be obtained. The photonic crystal optical fiber coupler disclosed by the invention has the characteristics of flexible structure, low insertion loss, excellent coupling performance, wide application range, and the like.

Description

technical field [0001] The invention belongs to the application field of photonic crystal fiber, and relates to a photonic crystal fiber coupler and a preparation method thereof. Background technique [0002] Photonic crystal fiber (PCF) is a two-dimensional photonic crystal in which air holes on the order of wavelength are periodically and evenly arranged along the axial direction in a pure silica fiber to form a microstructure cladding. Due to the superior optical characteristics of photonic crystal fibers such as unlimited single-mode transmission, large mode field area, high nonlinearity, and controllable dispersion, theoretical analysis, experimental research, and device development based on photonic crystal fibers have become the most advanced in the field of optics. Hot research topic. [0003] Photonic crystal fiber coupler (PCFC) is an important device in the application of photonic crystal fiber. At present, PCFC can be divided into three categories according to t...

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Problems solved by technology

The fusion tapering method is to heat several photonic crystal fibers by flame or laser heating tapering, but it will collapse the air holes of the photonic crystal fiber and destroy its waveguide structure, resulting in a large loss

In 2002, Byeong Ha Lee's article "Photonic crystal fiber coupler" 2002, V.27, NO.10, 812-814 in OPTICS LETTERS magazine disclosed that PCFC was produced by fusion tapered method, but its insertion loss was as high as 20dB; In the PCFC report produced by the tapered method, the insertion loss of the coupler is also above 10dB

This method is simple to implement, but the structural flexibility is poor; at the same time, in order to ensure a strong enough coupling phenomenon, the polishing depth of the photonic crystal fiber must be large enough, which changes the equivalent refractive index of the beam in the fiber polishing area, causing a large Radiation mode loss, and the sensitivity of the coupling ratio to wavelength in the coupler also affects the bandwidth flatness of the PCF

In 2009, OPTICS LETTERS published an article titled "2×2photonic crystal fiber splitter based on silica-based planar lightwave circuits" by Joo Beom Eom, 2009, V.34, NO.23, 3737-3739, disclosing an The waveguide (PLC) beam splitter realizes the photonic crystal fiber beam splitting coupling method, but due to the use of the planar optical waveguide beam splitter, there are many connection points between the photonic crystal fiber and the waveguide, and the connection loss is large, which greatly affects the photonic crystal fiber coupling. The coupling efficiency of the

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