Coupling device with compensated birefringence

摘要

The device has a layer placed on another layer (30), where a periodicity direction of rows of patterns (31) in the latter layer is perpendicular to a periodicity direction of rows of patterns (51) in the former layer. The rows of patterns (31) are extended on a distance greater than or equal to the vacuum wavelength of an optical wave. The width of the patterns (31) is less than or equal to tenth of the wavelength, and a period of the patterns (31) ranges between 50 nanometers and 1 micrometer. The patterns (51) are arranged to form a periodic diffraction network. An independent claim is also included for Independent claims are also included for the following: (1) an optical circuit comprising an optical coupling device (2) a method for realizing an optical coupling device (3) a method for realizing an optical circuit.