The Hong Kong Polytechnic University

Jian Ju

Wei Jin

Zhi Wang

A two-mode photonic crystal fiber includes a core of a substantially transparent core material. The core material has a core refractive index and a length, and has a core diameter. The fiber also includes a cladding region surrounding the length of core material. The cladding region has a first substantially transparent cladding material, having a first refractive index. The first substantially transparent cladding material has embedded along its length a substantially periodic array of holes, having a diameter, d, and being spaced apart by a pitch, &#x39b;. The holes have a second refractive index, which is less than the first refractive index. The dimensions of the hole diameter, d, and the pitch, &#x39b;, co-operate to give two modes propagation within the photonic crystal fiber independent of input radiation wavelength for any value of the pitch, &#x39b;, for a substantially fixed d/&#x39b; ratio within a range of approximately 0.45&#x2013;0.65.

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Hong Kong, China

Jian Ju