ATHERMAL ARRAYED WAVEGUIDE GRATING MODULE AND THE MANUFACTURING METHOD THEREOF

摘要

The wavelength multiplexing and demultiplexing characteristics of the AWG (Arrayed Waveguide Grating) module are closely related to specificity of spectral position dependent on specific wavelengths. The positional specificity is such that when a position of the originally designed input waveguide (1) is moved horizontally in x-direction (9) along the tangential interface of the input slab waveguide (3) to the incident light propagation path, the wavelengths of light entering into the output waveguide (2) undergoes proportionate shifting. The wavelength at the output waveguide (2) shits by d?when the position is moved by dx in the horizontal direction from the center of the focal point of the input slab waveguide (3). The temperature dependency of the wavelength can be compensated by utilizing this positional shifting of wavelengths; namely by changing input waveguide's position on the input slab guide (3). In order to move the position of the input waveguide (1) passively upon the temperature change, it is necessary to move horizontally (x-direction (9)) the position of the originally designed input waveguide (1) attached with a temperature compensation rod (10) having larger TEC than substrate; the horizontal movement is effected when the temperature compensation rod (10) undergoes thermal expansion and contraction. The present invention features the novelty of temperature-independent AWG module and the manufacturing method, regarding specifically to improvement of optical loss and optical return, and to the suitable materials for the temperature compensation rod, which matches to the specific wavelength division spacing.