Abstract: Provided is a method for playing media data. The method includes: receiving a trigger instruction; generating a second count value based on a stored first count value and a preset algorithm, and storing the second count value to overwrite the first count value, wherein the second count value is different from the first count value; generating audio data carrying a pre-stored authority identifier and the second count value; and playing the audio data, wherein the audio data is configured to instruct a second terminal to acquire the authority identifier and the second count value carried in the audio data, and send the authority identifier and the second count value to a server, and the second terminal is a terminal that has received the audio data.

Abstract: A laser-written waveguide comprising, an optical substrate having a first refractive index, a plurality of laser-written tracks buried within the optical substrate and having a second refractive index lower than the first refractive index, one or more concentric geometric regions bounding the plurality of laser-written tracks and a waveguide channel delimited by said concentric geometric regions, wherein said waveguide channel is configured to allow formation of an optical mode.

Abstract: A laser-written waveguide comprising, an optical substrate having a first refractive index, a plurality of laser-written tracks buried within the optical substrate and having a second refractive index lower than the first refractive index, one or more concentric geometric regions bounding the plurality of laser-written tracks and a waveguide channel delimited by said concentric geometric regions, wherein said waveguide channel is configured to allow formation of an optical mode.