Shanghai University

Chuanlu Deng

Yi Huang

Tingyun Wang

Xiaobei Zhang

Chengyong Hu

Xueting Wang

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

Disclosed are a system and a method for measuring a magnetorefractive effect of an optical fiber. The system comprises a laser, a coupler A, a sensing optical fiber, a reference optical fiber, a carrier generator, a coupler B, a photoelectric detector and a data acquisition and processing module. The coupler A, the sensing optical fiber, the reference optical fiber and the coupler B form a Mach-Zehnder optical fiber interferometer. An external magnetic field influences the refractive index of the sensing optical fiber, so that the optical path difference between two paths of optical signals in the sensing optical fiber and the reference optical fiber is changed, the intensity of an interference optical signal output by the coupler B is changed, and the refractive index change of the sensing optical fiber under the action of the magnetic field is measured by detecting and processing the interference optical intensity.

System and method for measuring magnetorefractive effect of optical fiber

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.

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Shanghai, China

Chuanlu Deng