Shanghai University

Xiaobei Zhang

Yi Huang

Tingyun Wang

Chuanlu Deng

Wei Chen

Ying Zhang

Yang Wang

Jianxiang Wen

Yanhua Dong

Fufei Pang

Xueting Wang

Tinyun Wang

Sujuan Huang

Disclosed is an optical waveguide multi-cascaded coupling mode division multiplexer. The optical waveguide multi-cascaded coupling mode division multiplexer comprises an optical waveguide layer and a substrate layer, wherein the optical waveguide layer comprises a first optical waveguide and a second optical waveguide; the second optical waveguide comprises a transmission optical waveguide and a plurality of coupling structures; each coupling structure comprises a coupling optical waveguide and a connecting optical waveguide; the coupling optical waveguide and the transmission optical waveguide are connected through the connecting optical waveguide; the coupling optical waveguide is parallel to the transmission optical waveguide; and the distance between the coupling optical waveguide and the first optical waveguide is smaller than that between the transmission optical waveguide and the first optical waveguide.

Optical waveguide multi-cascaded coupling mode division multiplexer

A bending-resistant low-crosstalk photonic orbital angular momentum (OAM) optical fiber waveguide. An optical fiber sequentially comprises, from the center to the outside, a first core layer (), a second core layer (), a first cladding layer (), a second cladding layer (), and a third cladding layer (), wherein the third cladding layer () is the thickest, the first core layer () is the second thickest, and the first cladding layer () is the thinnest; the refractive index of the first cladding layer () is the lowest, the refractive index of the second cladding layer () is the second lowest, and the refractive index of the second core layer () is the highest. The waveguide structure can effectively regulate the output of different OAM modes, and an effective refractive index difference between modes is greater than 2×10, the modes are easy to separate, and multiplexing and demultiplexing are facilitated.

Bending-resistant low-crosstalk photonic orbital angular momentum fiber waveguide

Disclosed is a method for fabricating a spherical concave mirror in an optical waveguide based on ultraviolet (UV) grayscale lithography. A key component is a specially designed mask pattern composed of a rectangle as well as a semicircle adjacent to the rectangle, where a rectangular area has no grayscale distribution, and UV light penetrating through different portions of the rectangular area has the same intensity; a semicircular area has the grayscale distribution, and the UV light penetrating through the semicircular area with the grayscale distribution is changed in intensity from the center of a circle in the radius direction according to a special function distribution law; an interlayer photoresist in the rectangular area is irradiated by the UV light penetrating through a mask plate and is developed to form an optical waveguide core.

Method for fabricating spherical concave mirror in optical waveguide based on ultraviolet grayscale lithography

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Shanghai, China

Xiaobei Zhang