▎ 摘　　要

NOVELTY - The converter has a cladding, multiple annular structures and a graphene piece. The cladding surrounds to form an internal space. The annular structure is located in the inner space. A portion of the graphene piece is located at an area of optical wave transmission. The region of the light wave transmission is located inside the internal space, where the cladding is made of polyurethane material. The graphene piece comprises a first graphene piece, a second graphene piece and a third graphene piece that are arranged in the same structure. USE - Wavelength converter for use in an optical network node device (claimed) i.e. optical cross connect (OXC) device, of a wavelength division optical communication network. ADVANTAGE - The wavelength converter combines and uses broadband ultra-low dispersion and optical field binding ability of optical fiber composed of cladding and annular structure and non-dispersion of graphene, broadband low loss transmission characteristic and ultra-high third-order nonlinear coefficient, the conversion bandwidth can reach 461nm, and the conversion efficiency reaches -21.7dB. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for an optical network node device. DESCRIPTION OF DRAWING(S) - The drawing shows a cross-sectional view along the radial direction of the wavelength converter. Wavelength converter (10) Formed core region (11) Inner space (12) Optical fiber (100) Cladding layer (110) Inner surface (111) Outer surface (112) Hole (113) Hole (114) Adjacent annular structure (120) First gap (131) Second gap (132) Graphene member (200) First end (210) Second end (220) Main body part (240) First connection section (241) Second connection section (242) Central section (243) First encapsulation part (310) Second package component (320)